JP2021001860A - Storage container and method for designing storage container - Google Patents

Abstract

To simplify disposal work without deteriorating shielding performance.SOLUTION: A storage container has an accommodation body 10 that accommodates high-dose substances, and a lid that closes an accommodation port of the accommodation body 10. The accommodation body 10 has a bottom 11, a side wall 12 connected to the bottom 11 and extending along the vertical direction of the bottom 11, and a through hole 13 penetrating from a connection part 15 between an inner surface 11a of the bottom 11 and an inner surface 12e of the side wall 12 to the outside of the accommodation body 10. The through hole 13 has at least one refraction part 13p.SELECTED DRAWING: Figure 3

Description

The present invention relates to a storage container and a method for designing a storage container.

At a nuclear power plant, etc., the internal structures in the reactor pressure vessel are cut and disassembled in water, filled in the disposal vessel, and then carried out to the buried disposal facility, etc. Patent Document 1 discloses a method for disposing of radioactive waste. Specifically, the disposal method of Patent Document 1 is to store radioactive waste in a storage container in a pool, and with the storage container housed in a transportation container, water inside the storage container and the transportation container. Is discharged to the outside.

Japanese Patent No. 4954520

In the conventional disposal method, a high dose of waste is stored inside the storage container, but the storage container is formed with a drain hole (through hole). Conventional storage containers can be affected by shielding defects from drain holes. For this reason, in the conventional disposal method, water is drained after the storage container is housed in the transport container, but it is desired to simplify the disposal work without deteriorating the shielding performance.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a storage container and a method for designing a storage container that can simplify the disposal work without deteriorating the shielding performance. To do.

The storage container of the present invention is a storage container having a storage body for storing a high-dose substance and a lid portion for closing the storage port of the storage body, and the storage body is connected to a bottom portion and the bottom portion. Further, the side wall portion extending along the vertical direction of the bottom portion and a through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodation main body are provided. It is characterized by having at least one refracting portion.

According to the storage container of the present invention, in the storage container, a through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodating body is formed in the accommodating body, and at least one refraction is formed in the through hole. The part is formed. As a result, even if a high-dose substance is stored in the storage body, the storage container can discharge the liquid, gas, etc. inside the storage body from the through hole in a state where the shielding defect is suppressed by the refracting part of the through hole. it can. As a result, even if the storage container is provided with a through hole in the storage body, it is not necessary to store the storage container in another container or the like, so that the disposal work can be simplified without deteriorating the shielding performance.

Further, in the storage container of the present invention, the side wall portion has a plurality of side surfaces and a corner portion that connects adjacent side surfaces at a predetermined angle, and the through hole is an inner surface of the bottom portion and the corner portion. It may be formed in the connecting portion with the inner surface of the portion.

According to this configuration, in the storage container, a through hole is formed at the connecting portion between the corner portion of the side wall portion and the inner surface of the bottom portion. As a result, in the case of a rectangular storage body, the storage container can form a through hole at a corner portion thicker than the side wall. That is, the storage container can form a through hole at a position where the distance from the inner surface to the outer surface of the storage body is maximized. As a result, the storage container can secure a range in which the through hole is refracted, so that the shielding defect can be further suppressed.

Further, in the storage container of the present invention, the accommodating body further has an intake hole for sucking gas inside the accommodating body, and the intake hole is a through hole with reference to the center point of the accommodating body. It may be formed on the opposite portion of the accommodating body.

According to this configuration, the storage container can be formed in the storage body so that the through hole and the intake hole face each other with respect to the center point. As a result, since the storage container can circulate the gas taken in from the intake hole and discharged from the through hole inside the accommodating main body, the inside of the accommodating main body can be efficiently dried.

Further, in the storage container of the present invention, when the storage body contains a liquid, the through hole discharges the liquid to the outside of the storage body, and the storage body sucks the gas from the intake hole. If so, the gas may be discharged to the outside of the storage body.

According to this configuration, when the storage body stores the liquid, the storage container can discharge the liquid to the outside of the storage body through the through hole. When the storage container is sucked with gas from the intake hole, the storage container can discharge the gas to the outside of the storage body through the through hole. As a result, the storage container can discharge the gas and the liquid inside the accommodating body from the through hole, so that the disposal work can be simplified without deteriorating the shielding performance.

で規定される距離ｔ、Ｐ_１＝ｂ／ｓｉｎαで規定される直線Ｐ_１、及び、ｔａｎθ≦Ｔ_ｏ／Ｔ_１の場合、Ｐ_２＝（Ｔ_１／ｃｏｓθ）−（ａ／ｃｏｓθ）、ｔａｎθ>Ｔ_ｏ／Ｔ_１の場合、Ｐ_２＝（Ｔ_０／ｓｉｎθ）−（ａ／ｃｏｓθ）で規定される直線Ｐ_２が、Ｔ_Ｂ＝Ｍｉｎ(Ｔ_０−ΔＴ，Ｔ₂−ΔＴ)で規定される前記高線量物質の線量に基づく前記収容本体の基準板厚Ｔ_Ｂ以上であることを示す評価式を満たすように、前記貫通孔の幾何学条件を決定し、前記幾何学条件は、前記第１流路の前記底部の内面に沿った第１方向の前記側壁部の内面からの前記第１流路の第１長さと、前記側壁部の内面に沿った第２方向の前記底部の内面からの前記第１流路の第２長さと、前記第２流路と前記第１方向とのなす角の角度と、前記貫通孔の径と、を含む。
ａ：底部の内面に沿った第１方向の側壁部の内面からの第１流路の第１長さ
ｂ：側壁部の内面に沿った第２方向の底部の内面からの第１流路の第２長さ
ｄ：貫通孔の径
α：第２流路と第１方向とのなす角
θ：第１流路と、底部の内面から側面に延びる仮想線とのなす角
Ｔ_０：収納容器の底の厚み
Ｔ_１：収容本体を斜めに切断した角部の厚み
Ｔ_２：収納容器の側面の厚み
ΔＴ＝Ｍｉｎ（−１／μ・ｌｎ（φ_１／φ_０），−１／μ・ｌｎ（φ_２／φ_０））の値
η：Ｔ_１＋ｄ・ｓｉｎθの値
β：ｂ＋（Ｔ_１−ａ）・ｔａｎαの値
ε：β＋ｄ・（ｃｏｓθ−１／ｃｏｓα）の値
Ａ’：（β＋ｄ・ｃｏｓθ−Ｔ_１・ｔａｎθ）／（β−η・ｔａｎθ）の値
Ｂ’：ｄ／（ｃｏｓα・（β−η・ｔａｎθ））の値
μ：減衰係数
φ_０：収容本体の中心点Ｃ付近のγ線束
φ₁：第１流路の欠損により影響を受ける部位のγ線束
φ₂：第２流路の欠損により影響を受ける部位のγ線束 Further, in the storage container of the present invention, the through-hole, the relationship between tan [alpha and _T o / _{T 1} satisfies the tanα ≦ _T o / _{T 1,} the connecting portion between the first flow path and said connecting portion and The distance from the first point where the straight line passing through the connection point between the second flow path and the outer surface of the accommodating body intersects the second flow path to the second point where the straight line intersects the first flow path. And

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = b / sin .alpha and, in the case of _{tanθ ≦ T o / T 1,} P 2 = (T 1 / cosθ) - (a / cosθ), tanθ > for _{T o / T 1, P 2} = (T 0 / sinθ) - straight _{P 2} defined by (a / cos [theta]) _is defined by _{T B = Min (T 0 -ΔT} , T 2 -ΔT) said high so as to satisfy the evaluation equation showing that dose material is the receiving body of the reference plate thickness T _B or based on dose being determines geometrical conditions of the through hole, the geometric conditions, the The first length of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion of the first flow path, and the inner surface of the bottom portion in the second direction along the inner surface of the side wall portion. Includes the second length of the first flow path from the above, the angle formed by the second flow path and the first direction, and the diameter of the through hole.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value η: T ₁ + d · sin θ value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A': ( β + d ・ cosθ-T ₁・ tanθ) / (β-η ・ tanθ) value B': d / (cosα ・ (β-η ・ tanθ)) value μ: Attenuation coefficient φ ₀ : Center point C of the housing body Nearby γ-ray bundle φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ-ray bundle of the part affected by the defect of the second flow path

According to this configuration, storage container, so as to satisfy the evaluation equation showing that distance t about the through-holes, linear P ₁ and the straight line P ₂ is the reference thickness T _B above, determines the geometrical conditions of the through-hole can do. As a result, the storage container can suppress the deterioration of the shielding performance due to the through hole by forming the through hole based on the geometric condition in consideration of the dose of the storage body containing the high dose substance.

で規定される距離ｔ、Ｐ_１＝ａ／ｃｏｓαで規定される直線Ｐ_１、及び、Ｐ_２＝（Ｔ_１／ｃｏｓθ）−（ａ／ｃｏｓθ）で規定される直線Ｐ_２が、Ｔ_Ｂ＝Ｍｉｎ(Ｔ_０−ΔＴ，Ｔ_２−ΔＴ)で規定される前記高線量物質の線量に基づく前記収容本体の基準板厚Ｔ_Ｂ以上であることを示す評価式を満たすように、前記貫通孔の幾何学条件を決定し、前記幾何学条件は、前記第１流路の前記底部の内面に沿った第１方向の前記側壁部の内面からの前記第１流路の第１長さと、前記側壁部の内面に沿った第２方向の前記底部の内面からの前記第１流路の第２長さと、前記第２流路と前記第１方向とのなす角の角度と、前記貫通孔の径と、を含む。
ａ：底部の内面に沿った第１方向の側壁部の内面からの第１流路の第１長さ
ｂ：側壁部の内面に沿った第２方向の底部の内面からの第１流路の第２長さ
ｄ：貫通孔の径
α：第２流路と第１方向とのなす角
θ：第１流路と、底部の内面から側面に延びる仮想線とのなす角
Ｔ_０：収納容器の底の厚み
Ｔ_１：収容本体を斜めに切断した角部の厚み
Ｔ_２：収納容器の側面の厚み
ΔＴ＝Ｍｉｎ（−１／μ・ｌｎ（φ_１／φ_０），−１／μ・ｌｎ（φ_２／φ_０））の値
β：ｂ＋（Ｔ_１−ａ）・ｔａｎαの値
ε：β＋ｄ・（ｃｏｓθ−１／ｃｏｓα）の値
Ａ″：（β−ｄ／ｃｏｓα−η・ｔａｎθ）／（ε−Ｔ_１・ｔａｎθ）
Ｂ″：ｄ／（ｃｏｓα・（Ｔ_１・ｔａｎα−ε））
μ：減衰係数
φ_０：収容本体の中心点Ｃ付近のγ線束
φ_１：第１流路の欠損により影響を受ける部位のγ線束
φ_２：第２流路の欠損により影響を受ける部位のγ線束 Further, in the storage container of the present invention, the through-hole, the relationship between tan [alpha and _T o / _{T 1} satisfies the _{tanα> T} o / T _1, the connecting portion between the first flow path and said connecting portion and The distance from the first point where the straight line passing through the connection point between the second flow path and the outer surface of the accommodating body intersects the second flow path to the second point where the straight line intersects the first flow path. And

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = a / cos [alpha], _{and, P 2 = (T 1 /} cosθ) - linear _{P 2} defined by _{(a / cosθ), T B} = _{Min (T 0 -ΔT, T 2} -ΔT) so as to satisfy the evaluation equation showing that at the housing body of the reference plate thickness T _B above defined based on the dose of the high dose substance, of the through hole The geometric conditions are determined by the first length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom of the first flow path and the side wall. The second length of the first flow path from the inner surface of the bottom in the second direction along the inner surface of the portion, the angle formed by the second flow path and the first direction, and the diameter of the through hole. And, including.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A ″: (β − d / cos α −η · tan θ ) / (Ε-T _1. tan θ)
_{B ": d / (cosα ·} (T 1 · tanα-ε))
μ: Attenuation coefficient φ ₀ : γ-ray bundle near the center point C of the accommodating body φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ of the part affected by the defect of the second flow path Line bundle

According to this configuration, storage container, so as to satisfy the evaluation equation showing that distance t about the through-holes, linear P ₁ and the straight line P ₂ is the reference thickness T _B above, determines the geometrical conditions of the through-hole can do. As a result, the storage container can suppress the deterioration of the shielding performance due to the through hole by forming the through hole based on the geometric condition in consideration of the dose of the storage body containing the high dose substance.

Further, in the storage container of the present invention, the through hole has a first flow path extending from the connecting portion in a direction intersecting the vertical direction and a second flow path refracting from the first flow path and extending to the outside of the storage body. The refracting portion may be a portion of the through hole in which the first flow path and the second flow path are connected to each other.

According to this configuration, in the storage container, the first flow path extending from the connecting portion in the direction intersecting the vertical direction and the second flow path refracting from the first flow path and extending to the outside of the accommodating body are connected by the bending portion. The through hole can be formed in the housing body. As a result, the storage container can suppress the deterioration of the shielding performance due to the refraction between the first flow path and the second flow path, and improve the efficiency of discharging the liquid from the connecting portion to the first flow path. Can be done.

で規定される距離ｔ、Ｐ_１＝ｂ／ｓｉｎαで規定される直線Ｐ_１、及び、ｔａｎθ≦Ｔ_ｏ／Ｔ_１の場合、Ｐ_２＝（Ｔ_１／ｃｏｓθ）−（ａ／ｃｏｓθ）、ｔａｎθ>Ｔ_ｏ／Ｔ_１の場合、Ｐ_２＝（Ｔ_０／ｓｉｎθ）−（ａ／ｃｏｓθ）で規定される直線Ｐ_２が、Ｔ_Ｂ＝Ｍｉｎ(Ｔ_０−ΔＴ，Ｔ₂−ΔＴ)で規定される前記高線量物質の線量に基づく前記収容本体の基準板厚Ｔ_Ｂ以上であることを示す評価式を満たすように、前記貫通孔の幾何学条件を決定し、前記幾何学条件は、前記第１流路の前記底部の内面に沿った第１方向の前記側壁部の内面からの前記第１流路の第１長さと、前記側壁部の内面に沿った第２方向の前記底部の内面からの前記第１流路の第２長さと、前記第２流路と前記第１方向とのなす角の角度と、前記貫通孔の径と、を含むことを特徴とする。
ａ：底部の内面に沿った第１方向の側壁部の内面からの第１流路の第１長さ
ｂ：側壁部の内面に沿った第２方向の底部の内面からの第１流路の第２長さ
ｄ：貫通孔の径
α：第２流路と第１方向とのなす角
θ：第１流路と、底部の内面から側面に延びる仮想線とのなす角
Ｔ_０：収納容器の底の厚み
Ｔ_１：収容本体を斜めに切断した角部の厚み
Ｔ_２：収納容器の側面の厚み
ΔＴ＝Ｍｉｎ（−１／μ・ｌｎ（φ_１／φ_０），−１／μ・ｌｎ（φ_２／φ_０））の値
η：Ｔ_１＋ｄ・ｓｉｎθの値
β：ｂ＋（Ｔ_１−ａ）・ｔａｎαの値
ε：β＋ｄ・（ｃｏｓθ−１／ｃｏｓα）の値
Ａ’：（β＋ｄ・ｃｏｓθ−Ｔ_１・ｔａｎθ）／（β−η・ｔａｎθ）の値
Ｂ’：ｄ／（ｃｏｓα・（β−η・ｔａｎθ））の値
μ：減衰係数
φ_０：収容本体の中心点Ｃ付近のγ線束
φ₁：第１流路の欠損により影響を受ける部位のγ線束
φ₂：第２流路の欠損により影響を受ける部位のγ線束 The method for designing a storage container of the present invention includes a storage body for storing a high-dose substance and a lid portion for closing the storage port of the storage body, and the storage body is connected to a bottom portion and the bottom portion. It has a side wall portion extending along the vertical direction of the bottom portion and a through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodation body, and the through hole is at least. A method of designing a storage container having one bending portion, in which the through hole is a first flow path extending from the connecting portion in a direction intersecting the vertical direction, and a first flow path that is bent from the first flow path and the storage body. and a second flow passage extending to the outside of, the, relationship between the tan [alpha and _T o / _{T 1} satisfies the tanα ≦ _T o / _{T 1,} the connecting portion between the first flow path and said connecting portion and The distance from the first point where the straight line passing through the connection point between the second flow path and the outer surface of the accommodating body intersects the second flow path to the second point where the straight line intersects the first flow path. And

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = b / sin .alpha and, in the case of _{tanθ ≦ T o / T 1,} P 2 = (T 1 / cosθ) - (a / cosθ), tanθ > for _{T o / T 1, P 2} = (T 0 / sinθ) - straight _{P 2} defined by (a / cos [theta]) _is defined by _{T B = Min (T 0 -ΔT} , T 2 -ΔT) said high so as to satisfy the evaluation equation showing that dose material is the receiving body of the reference plate thickness T _B or based on dose being determines geometrical conditions of the through hole, the geometric conditions, the The first length of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion of the first flow path, and the inner surface of the bottom portion in the second direction along the inner surface of the side wall portion. It is characterized by including the second length of the first flow path from the above, the angle formed by the second flow path and the first direction, and the diameter of the through hole.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value η: T ₁ + d · sin θ value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A': ( β + d ・ cosθ-T ₁・ tanθ) / (β-η ・ tanθ) value B': d / (cosα ・ (β-η ・ tanθ)) value μ: Attenuation coefficient φ ₀ : Center point C of the housing body Nearby γ-ray bundle φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ-ray bundle of the part affected by the defect of the second flow path

で規定される距離ｔ、Ｐ_１＝ａ／ｃｏｓαで規定される直線Ｐ_１、及び、Ｐ_２＝（Ｔ_１／ｃｏｓθ）−（ａ／ｃｏｓθ）で規定される直線Ｐ_２が、Ｔ_Ｂ＝Ｍｉｎ(Ｔ_０−ΔＴ，Ｔ_２−ΔＴ)で規定される前記高線量物質の線量に基づく前記収容本体の基準板厚Ｔ_Ｂ以上であることを示す評価式を満たすように、前記貫通孔の幾何学条件を決定し、前記幾何学条件は、前記第１流路の前記底部の内面に沿った第１方向の前記側壁部の内面からの前記第１流路の第１長さと、前記側壁部の内面に沿った第２方向の前記底部の内面からの前記第１流路の第２長さと、前記第２流路と前記第１方向とのなす角の角度と、前記貫通孔の径と、を含むことを特徴とする。
ａ：底部の内面に沿った第１方向の側壁部の内面からの第１流路の第１長さ
ｂ：側壁部の内面に沿った第２方向の底部の内面からの第１流路の第２長さ
ｄ：貫通孔の径
α：第２流路と第１方向とのなす角
θ：第１流路と、底部の内面から側面に延びる仮想線とのなす角
Ｔ_０：収納容器の底の厚み
Ｔ_１：収容本体を斜めに切断した角部の厚み
Ｔ_２：収納容器の側面の厚み
ΔＴ＝Ｍｉｎ（−１／μ・ｌｎ（φ_１／φ_０），−１／μ・ｌｎ（φ_２／φ_０））の値
β：ｂ＋（Ｔ_１−ａ）・ｔａｎαの値
ε：β＋ｄ・（ｃｏｓθ−１／ｃｏｓα）の値
Ａ″：（β−ｄ／ｃｏｓα−η・ｔａｎθ）／（ε−Ｔ_１・ｔａｎθ）
Ｂ″：ｄ／（ｃｏｓα・（Ｔ_１・ｔａｎα−ε））
μ：減衰係数
φ_０：収容本体の中心点Ｃ付近のγ線束
φ_１：第１流路の欠損により影響を受ける部位のγ線束
φ_２：第２流路の欠損により影響を受ける部位のγ線束 The method for designing a storage container of the present invention includes a storage body for storing a high-dose substance and a lid portion for closing the storage port of the storage body, and the storage body is connected to a bottom portion and the bottom portion. It has a side wall portion extending along the vertical direction of the bottom portion and a through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodation body, and the through hole is at least. A method of designing a storage container having one bending portion, in which the through hole is a first flow path extending from the connecting portion in a direction intersecting the vertical direction, and a first flow path that is bent from the first flow path and the storage body. and a second flow passage extending to the outside of, the, relationship between the tan [alpha and _T o / _{T 1} satisfies the _{tanα> T} o / T _1, the connecting portion between the first flow path and said connecting portion and The distance from the first point where the straight line passing through the connection point between the second flow path and the outer surface of the accommodating body intersects the second flow path to the second point where the straight line intersects the first flow path. And

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = a / cos [alpha], _{and, P 2 = (T 1 /} cosθ) - linear _{P 2} defined by _{(a / cosθ), T B} = _{Min (T 0 -ΔT, T 2} -ΔT) so as to satisfy the evaluation equation showing that at the housing body of the reference plate thickness T _B above defined based on the dose of the high dose substance, of the through hole The geometric conditions are determined by the first length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom of the first flow path and the side wall. The second length of the first flow path from the inner surface of the bottom portion in the second direction along the inner surface of the portion, the angle formed by the second flow path and the first direction, and the diameter of the through hole. It is characterized by including.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A ″: (β − d / cos α −η · tan θ ) / (Ε-T _1. tan θ)
_{B ": d / (cosα ·} (T 1 · tanα-ε))
μ: Attenuation coefficient φ ₀ : γ-ray bundle near the center point C of the accommodating body φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ of the part affected by the defect of the second flow path Line bundle

According to the present invention, it is possible to provide a storage container and a method for designing a storage container that can simplify the disposal work without deteriorating the shielding performance.

FIG. 1 is an exploded perspective view showing an example of a storage container according to the present embodiment. FIG. 2 is a diagram showing an upper surface of a storage container main body according to the present embodiment. FIG. 3 is a view showing a side surface of the accommodation main body according to the present embodiment. FIG. 4 is an enlarged cross-sectional view of a portion B of the line AA in FIG. FIG. 5 is a diagram showing an example of a γ-ray bundle in a cross-sectional portion obtained by enlarging the portion B of the line AA in FIG. FIG. 6 is a diagram for explaining an example of determining a through hole in the storage container according to the present embodiment. FIG. 7 is a diagram showing an example of the result of measuring the feasibility of the through hole in the storage container according to the present embodiment. FIG. 8 is a diagram showing Example 1 of a through hole in the storage container according to the present embodiment. FIG. 9 is a diagram showing Example 2 of a through hole in the storage container according to the present embodiment. FIG. 10 is a diagram for explaining another example of determining a through hole in the storage container according to the present embodiment. FIG. 11 is a diagram for explaining an example of using the storage container according to the present embodiment. FIG. 12 is a diagram for explaining the drying process of the storage container according to the present embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. Further, the components described below can be appropriately combined, and when there are a plurality of embodiments, the respective embodiments can be combined.

[Embodiment]
An example of the configuration of the storage container 1 according to the present embodiment will be described with reference to the drawings of FIGS. 1 to 3. FIG. 1 is an exploded perspective view showing an example of a storage container according to the present embodiment. FIG. 2 is a view showing the upper surface of the storage main body 10 of the storage container 1 according to the present embodiment. FIG. 3 is a view showing a side surface of the accommodation main body 10 according to the present embodiment.

In the example shown in FIG. 1, the storage container 1 stores a high-dose substance or the like generated at a nuclear power plant. The high-dose substance includes, for example, a substance obtained by cutting and disassembling the internal structure of the reactor pressure vessel. In the example shown in FIG. 1, the storage container 1 is shown in a simplified external shape. Actually, the storage container 1 has, for example, a structure for locking a hanging tool or the like.

For high-dose substances, the disposal regulations are being reviewed, and the acceptance criteria for disposal facilities that accept waste have not been decided. Therefore, until the specifications of the disposal container for disposing of the high-dose substance are finalized, there is a desire to store the disassembled high-dose substance in the storage container 1 and store it in the standardized disposal container at the time of carrying out. Further, the high-dose substance is disassembled in water and stored in the storage container 1. In this case, water remains in the storage container 1, and there is a concern that hydrogen may explode due to the radiolyzed gas. Therefore, the storage container 1 needs to be internally dried from the viewpoint of ensuring safety.

In this embodiment, an example will be described in which a storage container 1 capable of simplifying the work of disposing of a high-dose substance without deteriorating the shielding performance is realized.

The storage container 1 is formed in a hollow rectangular shape by, for example, a metal such as iron or stainless steel. The storage container 1 has a storage body 10 and a lid 20. The accommodating body 10 accommodates a high-dose substance inside. The thickness of the housing body 10 is preferably larger than 100 mm in consideration of, for example, shielding property and manufacturability. The lid 20 is attached to the storage body 10 so as to close the storage port 10a of the storage body 10. The accommodating body 10 and the lid 20 are detachably configured. The storage container 1 becomes a sealed hollow square container when the lid 20 is attached so as to close the storage port 10a of the storage body 10.

As shown in FIGS. 2 and 3, the accommodating main body 10 has a bottom portion 11, a side wall portion 12, a through hole 13, and an intake hole 14. The bottom portion 11 and the side wall portion 12 are integrally formed of the above-mentioned metal. The through hole 13 and the intake hole 14 are formed as holes penetrating the accommodating main body 10.

The bottom portion 11 faces the attached lid portion 20 and is a portion of the housing body 10 in which a high-dose substance is installed. The side wall portion 12 is formed so as to be connected to the bottom portion 11 and extend along the vertical direction of the bottom portion 11. In the example shown in FIG. 3, the vertical direction is the Y-axis direction. The side wall portion 12 has a plurality of side surfaces 121a, side surfaces 121b, side surfaces 121c and side surfaces 121d provided on the edge of the bottom portion 11. The side surface 121a and the side surface 121c face each other. The side surface 121b and the side surface 121d face each other. The side wall portion 12 is connected in the order of the side surface 121a, the side surface 121b, the side surface 121c, and the side surface 121d to form a series of side walls.

In the example shown in FIG. 3, the side wall portion 12 has four corner portions 122a, corner portions 122b, corner portions 122c, and corner portions 122d. The corner portion 122a connects the side surface 121d and the side surface 121a at a predetermined angle, and is a portion of one internal angle on the side wall portion 12. The predetermined angle includes, for example, a right angle, an acute angle, an obtuse angle, and the like. The corner portion 122b connects the side surface 121a and the side surface 121b at a predetermined angle, and is a portion of one internal angle on the side wall portion 12. The corner portion 122c connects the side surface 121b and the side surface 121c at a predetermined angle, and is a portion of one internal angle on the side wall portion 12. The corner portion 122d connects the side surface 121a and the side surface 121d, and is a portion of one internal angle on the side wall portion 12.

The accommodating body 10 forms an accommodating portion 10s for accommodating a high-dose substance by a bottom portion 11 and a side wall portion 12. The accommodating portion 10s is in a shielded state by attaching the lid portion 20 to the accommodating main body 10.

The through hole 13 penetrates from the connecting portion 15 between the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12 to the outside of the accommodating main body 10. For example, when the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12 are connected at right angles, the connecting portion 15 becomes a portion of an internal angle between the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12. .. For example, when the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12 are connected via an inclined surface, the connecting portion 15 is an inclined surface between the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12. It becomes the part of.

The through hole 13 is formed at a position where the distance from the inside to the outside of the accommodating body 10 is maximized. For example, when the storage container 1 has a rectangular shape, the four corner portions 122a, the corner portions 122b, the corner portions 122c, and the corner portions 122d of the storage main body 10 are thicker than the side surface portions. In the present embodiment, the through hole 13 is formed in the connecting portion 15 at the corner portion 122a of the side wall portion 12. In other words, the connecting portion 15 is a corner portion between the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12.

The through hole 13 has at least one refracting portion 13p. The refracting portion 13p includes, for example, a portion in which the through hole 13 is refracted, a portion in which the through hole 13 is bent in an arc shape, and the like. The through hole 13 has a first flow path 13a and a second flow path 13b. The first flow path 13a and the second flow path 13b form one continuous flow path, and have the same cross-sectional shape in the width direction. The first flow path 13a is a flow path extending downward from the connecting portion 15 in a direction intersecting the Y-axis direction (vertical direction). The second flow path 13b is a flow path that is refracted from the first flow path 13a and extends to the outside of the accommodating main body 10. The second flow path 13b penetrates the side surface 121d of the accommodating body 10 so that liquids, gases, and the like can be discharged even when the storage container 1 is placed. The refracting portion 13p is a portion of a through hole 13 in which the first flow path 13a and the second flow path 13b are connected in a bent state. Further, in the present embodiment, the inner surface 11a of the bottom portion 11 is inclined so as to descend toward the through hole 13. As a result, the storage container 1 can improve the efficiency of discharging the liquid in the accommodating portion 10s from the through hole 13.

The intake hole 14 is a hole for sucking gas into the housing body 10. The intake hole 14 faces the through hole 13 and is formed in the upper portion of the side wall portion 12 in the vicinity of the accommodating port 10a. The intake hole 14 is formed as an inclined hole that descends outward from the inner surface 12e of the side wall portion 12. The intake hole 14 may be refracted in the same manner as the through hole 13.

In the present embodiment, the accommodating main body 10 is formed so that the through hole 13 and the intake hole 14 face each other. For example, as shown in FIGS. 2 and 3, the accommodating main body 10 has a through hole 13 and an intake hole 14 arranged so as to be point-symmetrical with respect to the center point C. In other words, as shown in FIG. 3, the accommodating main body 10 is arranged on the opposite line (AA line) connecting the corner portion 122a and the corner portion 122c of the side wall portion 12. The through hole 13 and the intake hole 14 are formed along the AA line. As a result, the accommodating main body 10 can efficiently circulate the gas taken in from the intake hole 14 to the accommodating portion 10s, and discharge the gas from the through hole 13.

Next, an example of the design method of the through hole 13 of the storage container 1 according to the present embodiment will be described with reference to the drawing of FIG. FIG. 4 is an enlarged cross-sectional view of a portion B of the line AA in FIG. That is, the cross-sectional view shown in FIG. 4 shows a cross section of the accommodating main body 10 when one corner portion 122a of the side wall portion 12 is cut diagonally. Housing body 10, the thickness of the bottom 11 and the sidewall portion 12 has a thickness T _0. Therefore, the thickness T ₁ of the corner portion 122 a obtained by cutting the housing body 10 diagonally is the value obtained by multiplying the thickness T ₀ of the housing body 10 by the square root of 2 minus the defect portion T 5 (see FIG. 1). It has become.

For example, it is assumed that the accommodation main body 10 has the same length and width, and the thickness of the bottom portion 11 and the side wall portion 12 is the same. In this case, the geometric conditions of the through hole 13 of the accommodating body 10 are determined so as to satisfy the evaluation formula EA described later. The geometric conditions are, for example, the first length a of the first flow path 13a in the X-axis direction, the second length b in the Y-axis direction, the inclination α of the second flow path 13b in the XY plane, and the diameter of the through hole 13. Includes conditions such as d. The installation location, structure, and the like of the through hole 13 of the accommodation body 10 are determined so as to satisfy the geometrical conditions.

Hereinafter, an example of a method for designing the storage container 1 using the evaluation formula EA of the through hole 13 shown in FIG. 4 will be described. The design method of the storage container 1 is realized by the computer, for example, when the computer executes a program.

The point P of the through hole 13 is a point where the first flow path 13a and the connecting portion 15 are connected to each other. The point Q of the through hole 13 is a point where the second flow path 13b and the outer surface 10b of the accommodating body 10 are connected to each other. The through hole 13 has an angle θ formed by the angle formed by the first flow path 13a and the virtual line 11b extending from the inner surface 11a of the bottom portion 11 to the side surface 121d. The through hole 13 is an inclination α of an angle formed by the second flow path 13b and the virtual line 11c passing through the point Q and parallel to the virtual line 11b. The outer corner SP of the corner portion 122a of the storage container 1 is the origin of the XY coordinate system. In this case, the coordinates of the point P are (T ₁ + d · sin θ, T ₀ ). The coordinates of the point Q are (0, T ₀ −b− (T _{1 −} a) · tan α). Further, in the present embodiment, "・" in the mathematical formula indicates a symbol of multiplication. Through-hole 13 shown in FIG. 4 satisfies tanα ≦ _T o / _{T 1.} That is, the shape is such that the inclination of the first flow path 13a is steeper than the inclination of the second flow path 13b.

The straight line F (X) passing through the point P and the point Q can be expressed by, for example, the equation (1).
F (X) = (b + (T ₁ −a) ・ tan α) / (T ₁ + d ・ sin θ) ・ X + T ₀ −b− (T ₁ −a) ・ tan α ・ ・ ・ Equation (1)

In the through hole 13, the intersection of the straight line F (X) and the second flow path 13b is a point R. In the through hole 13, the intersection of the straight line F (X) and the first flow path 13a is the point S. In the through hole 13, the straight line connecting the point R and the point S is the distance t. Straight _f 1 through the upper surface of the second flow path 13b of the through-hole 13 (X), for example, can be expressed by Equation (2).
f ₁ (X) = tanα · X + (T ₀ −b− (T ₁ −a) · tan α + d / cos θ) ・ ・ ・ Equation (2)

Straight _f 2 which passes through the upper surface of the first flow path 13a of the through-hole 13 (X), for example, can be expressed by Equation (3).
f ₂ (X) = tan θ ・ X + T ₀ − tan θ ・ T ₁ + d ・ cos θ ・ ・ ・ Equation (3)

The Xs coordinate of the point S in the XY plane can be obtained as follows based on the relationship of F (Xs) = f ₂ (Xs).
Xs = (b + d · cosθ + (T ₁ −a) · tan α −T ₁ · tan θ) · (T ₁ + d · sin θ) / (b + (T ₁ − a) tan α − (T ₁ + d · sin θ) · tan θ)

Here, for the sake of simplicity, if β = b + (T ₁ −a) · tan α, the Xs coordinates are transformed as follows.
Xs = (β + d · cosθ −T ₁ · tanθ) · (T ₁ + d · sinθ) / (β- (T ₁ + d · sinθ) · tanθ)

The Ys coordinate of the point S on the XY plane can be obtained by substituting Xs for F (X) in the equation (1).
Ys = β · (β + d · cosθ −T ₁ · tanθ) / (β- (T ₁ + d · sinθ) · tanθ) + T ₀ −β

Further, for simplification, if η = T ₁ + d · sin θ, the XY coordinates of the point S in the XY plane can be shown as follows.
Point S ((β + d ・ cosθ-T ₁・ tanθ) ・ η / (β-η ・ tanθ), β ・ (β + d ・ cosθ-T ₁・ tanθ) / (β-η ・ tanθ) + T _0- β)

Similarly, the XY coordinates of the point R in the XY plane can be shown as follows based on the relationship of F (Xr) = f ₁ (Xr) and the result of substituting Xr for F (X) in the equation (1). it can.
Point R (d ・ η / cosα ・ (β-η ・ tanα), β ・ d / cosα ・ (β-η ・ tanα) + T _0- β)

Since the distance t between the point R and the point S is the length between the point R and the point S, it can be expressed as equation (4) from t ² = (Xs-Xr) ² + (Ys-Yr) ^2. .. For simplification, A'= (β + d · cosθ−T ₁ · tanθ) / (β-η · tanθ), B'= d / (cosα · (β-η · tanθ)).

・・・式（４）

... Equation (4)

In the storage container 1, in order to minimize the influence of the shielding defect, it is desirable that the γ-ray bundle of the through hole 13 is equivalent to the central portion of the storage body 10. The range of the γ-ray bundle is, for example, 2.72 × 10 ⁹ n / cm ² / s to 1.26 × 10 ⁶ n / cm ² / s.

For example, when the maximum shielding thickness is 350 mm and the surface of the housing body 10 is 2 mSv / h, the radiation transmittance is 3.85 × ^10-5 . From the dose rate conversion coefficient and the transmittance, the γ-ray flux before the shielding transmission is 2.72 × 10 ⁹ n / cm ² / s. When the surface dose rate in this case the 2 mSv / h, since the transmittance is 8.34 × ^{10 -2,} gamma ray flux in the inner surface of the housing body 10 becomes ^{1.26 × 106 n / cm 2 /} s.

FIG. 5 is a diagram showing an example of a γ-ray bundle in a cross-sectional portion obtained by enlarging the portion B of the line AA in FIG. As shown in FIG. 5, gamma ray flux phi ₁ is a gamma ray flux sites affected by a deficiency of the first flow path 13a of the through-hole 13. That is, the γ-ray bundle φ ₁ is a γ-ray bundle directed in the direction along the first flow path 13a. The γ-ray bundle φ ₂ is a γ-ray bundle at a portion affected by a defect in the second flow path 13b of the through hole 13. That is, the γ-ray bundle φ ₂ is a γ-ray bundle directed in the direction along the second flow path 13b. γ-ray flux phi ₀ is a γ-ray beam near the center point C of the housing body 10.

For example, for γ-ray flux phi _1, if the shielding thickness of the housing main body 10 in the absence and the through-hole 13 and the intake hole 14 has a T ', the following equation holds (5). In the following description, exp is an exponential function and ln is a natural logarithm. μ indicates the damping coefficient.
exp (-μ ・ T') / exp (-μ ・ T ₀ ) = φ ₁ / φ ₀ ... Equation (5)

When equation (5) is expanded, T'−T ₀ = -1 / μ · ln (φ ₁ / φ ₀ ). Then, the margin ΔT of the thickness of the accommodating main body 10 when there is no shielding defect can be represented by T'−T ₀ . The margin ΔT indicates an acceptable range of the difference between the shielding thickness T'and the thickness T ₀ of the bottom 11. As a result, for the γ-ray bundle φ ₁ , the thickness margin ΔT becomes -1 / μ · ln (φ ₁ / φ ₀ ). Similarly, the γ-ray flux phi _2, tolerance [Delta] T of the thickness becomes ΔT = -1 / μ · ln ( φ 2 / φ 0).

Thus, the reference thickness _{T B} of the reference value of the storage container 1 _can be calculated by T B _{= T} 0 -.DELTA.T. Reference thickness T _B, for example, shows a thickness of the reference of the bottom 11 and the side wall 12 of the housing body 10. Reference thickness T _B is determined based γ-ray flux phi _1, the phi _2. Therefore, to minimize the effect of shielding deficiency, the distance t between the point R and the point S, so that the t ≧ T _B, the angle theta, the second flow path 13b inclination alpha, the through-hole 13 The diameter d may be determined.

FIG. 6 is a diagram for explaining an example of determining the through hole 13 in the storage container 1 according to the present embodiment. 6, the straight line _{P 1} extends in the extending direction of the second flow path 13b of the through-hole 13 is a straight line towards the inner surface 11a of the bottom portion 11 from the bent portion 13p of the through-hole 13. Linear _{P 2} extends in the extending direction of the first flow path 13a of the through-hole 13 is a straight line extending from the bent portion 13p of the through-hole 13 to the outer surface 10b of the housing body 10.

In the example shown in FIG. 6, since tan θ is b / a, the angle θ is tan ^-1 · (b / a). For example, in the case of tanθ ≦ _T o / _{T 1,} the straight line _{P 2 is,} (T 1 / cosθ) - represented by (a / cosθ). For example, in the case of _{tanθ> T} o / T _1, the straight line _{P 2 is,} (T 0 / _sinθ) - represented by (a / cosθ). The straight line P ₁ is represented by b / sin α. In this case, the relationship between the straight line _{P 1} and the reference thickness _{T B} is, _{P 1} ≧ _{T B,} and the relationship between the straight line _{P 2} and the reference thickness _{T B,} the _{P 2} ≧ _{T B.}

Thus, evaluation formula EA of the through-hole 13 in the housing body 10, for _{example, t ≧ T B, P 1} ≧ T B, the _{P 2} ≧ _{T B.} The through hole 13 is formed by the first length a of the first flow path 13a in the X-axis direction, the second length b in the Y-axis direction, and the second flow path 13b in the XY plane so as to satisfy the relationship of the evaluation formula EA. The inclination α, the diameter d of the through hole 13, and the like may be determined. That is, the storage container 1 can prevent the streaming of γ-rays by determining the geometrical conditions of the through hole 13 so as to satisfy the evaluation formula EA. The necessary condition of the evaluation formula EA includes T _{0 −} β> 0. The necessary condition of the evaluation formula EA includes that the X coordinate of the point R described above is positive and smaller than the X coordinate of the point S. The necessary condition of the evaluation formula EA includes that the Y coordinate of the point R is equal to or less than the plate thickness. Requirements evaluation formula EA includes sections of straight lines f _{1 (X)} indicated by the equation (2) is positive. The length and thickness of the bottom portion and the side wall portion of the housing body 10 are preferably the same as in the present embodiment, but may be different.

FIG. 7 is a diagram showing an example of the feasibility measurement result of the through hole 13 in the storage container 1 according to the present embodiment. The result shown in FIG. 7 shows the inclination α of the second flow path 13b in the XY plane with respect to the combination of the first length a of the first flow path 13a in the X-axis direction and the second length b in the Y-axis direction. The result of the feasibility when the angle of is changed is shown. The feasibility means that "○" satisfies the evaluation formula EA and "x" does not satisfy the evaluation formula EA. The results shown in FIG. 7 show the measurement results of the feasibility when the inclination α of the second flow path 13b is changed for each combination of the plurality of first lengths a and the plurality of second lengths b. There is.

In the feasibility measurement result shown in FIG. 7, it is shown that the inclination α of the second flow path 13b is set at an angle of 45 ° or less. The second length b indicates that the applicable range is 250 mm or less. Further, it is shown that the ratio (a / b) of the first length a and the second length b may be set to 1.5 or less. As a result, the through hole 13 is designed so that the inclination α of the second flow path 13b is 30 ° or less and the second length b is 250 mm or less.

In the storage container 1 according to the present embodiment, the ratio of the first length a in the vertical direction to the second length b in the horizontal direction of the first flow path 13a is 6.0 or less, and the second length b is 250 mm. Below, the through hole 13 is formed in the accommodating main body 10 so that the angle formed by the second flow path 13b and the bottom portion 11 in the horizontal direction is 45 ° or less. As a result, the storage container 1 can suppress the deterioration of the shielding performance due to the through hole 13 by forming the through hole 13 in consideration of the gamma ray bundle in the center of the storage body 10 containing the high-dose substance.

FIG. 8 is a diagram showing Example 1 of the through hole 13 in the storage container 1 according to the present embodiment. The thickness T ₀ of the accommodating body 10 shown in FIG. 8 is 350 mm. The thickness T ₁ obtained by diagonally cutting the corner portion 122 a of the housing body 10 is 495 mm. The accommodation body 10 has a first flow path 13a having a first length a1 in the X-axis direction of 15 mm and a second length b1 in the Y-axis direction of 45 mm. The diameter d of the through hole 13 is 15 mm. The inclination α of the second flow path 13b is 10 °.

In this case, the distance t of the straight line connecting the points R and S can be determined to be 307 mm by the above equation (4). When the angle θ formed by the first flow path 13a of the through hole 13 and the virtual line 11b is 45 ° or less, the straight line P ₂ can be determined to be 1518 mm by using the above-mentioned calculation formula. Further, when the angle θ is larger than 45 °, the straight line P ₂ can be calculated as 322 mm by using the above-mentioned calculation formula. The straight line P ₁ can be determined to be 259 mm by using the above-mentioned calculation formula. The distance t, the linear P _1, if all the straight line P ₂ is greater than or equal to the reference thickness T _B defined on the basis of the γ-ray beam, the through-hole 13, taking into account the shielding defect of the housing body 10 geometry conditions Can be determined.

FIG. 9 is a diagram showing Example 2 of the through hole 13 in the storage container 1 according to the present embodiment. The thickness T ₀ of the accommodating body 10 shown in FIG. 9 is 350 mm. The thickness T ₁ obtained by diagonally cutting the corner portion 122 a of the housing body 10 is 495 mm. The accommodation body 10 has a first length a2 of the first flow path 13a in the X-axis direction of 150 mm and a second length b2 in the Y-axis direction of 170 mm. The diameter d of the through hole 13 is 20 mm. The inclination α of the second flow path 13b is 20 °.

In this case, the distance t of the straight line connecting the points R and S can be determined to be 412 mm by the above equation (4). When the angle θ formed by the first flow path 13a of the through hole 13 and the virtual line 11b is 45 ° or less, the straight line P ₂ can be determined to be 521 mm by using the above-mentioned calculation formula. Further, when the angle θ is larger than 45 °, the straight line P ₂ can be calculated as 240 mm by using the above-mentioned calculation formula. The straight line P ₁ can be determined to be 497 mm by using the above-mentioned calculation formula. The distance t, the linear P _1, if all the straight line P ₂ is greater than or equal to the reference thickness T _B defined on the basis of the γ-ray beam, the through-hole 13, taking into account the shielding defect of the housing body 10 geometry conditions Can be determined.

In the above embodiment, the shape of the through-hole 13 has been described in the case of tanα ≦ _T o / _{T 1,} the shape of the through-hole 13 is not limited thereto, tan _[alpha> may be _T o / T _1. The container body 110a of the storage container shown in FIG. 10 satisfy the shape when the through-hole 113 is _{tanα> T} o / T _1.

Hereinafter, another example of a method for designing a storage container using the evaluation formula EA of the through hole 113 shown in FIG. 10 will be described.

The point P of the through hole 113 is a point where the first flow path 113a and the connecting portion 15 are connected to each other. The point Q of the through hole 13 is a point where the second flow path 113b and the outer surface 110b of the accommodating body 110 are connected to each other. The angle θ of the through hole 113 is formed by an angle formed by the first flow path 113a and the virtual line 11b extending from the inner surface 11a of the bottom portion 11 to the side surface 121d. The through hole 113 is an inclination α of an angle formed by the second flow path 113b and the virtual line 11c passing through the point Q and parallel to the virtual line 11b. The outer corner SP of the corner portion 122a of the storage container 1 is the origin of the XY coordinate system.

When the through hole 113 is evaluated based on the evaluation formula EA in the same manner as described above, the first length a of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion and the side wall portion. The second length b of the first flow path from the inner surface of the bottom in the second direction along the inner surface, the diameter of the through hole is d, the angle α between the second flow path and the first direction, and the first flow path. The angle θ between the virtual line extending from the inner surface of the bottom to the side surface, the thickness T ₀ of the bottom of the storage container, the thickness T _{1 of the} corner cut diagonally from the storage body, the thickness T ₂ of the side surface of the storage container, the attenuation coefficient μ From the γ-ray bundle φ0 near the center point C of the accommodating body, the γ-ray bundle Φ1 of the part affected by the defect of the first flow path, and the γ-ray bundle Φ2 of the part affected by the defect of the second flow path, Min (-1) / Μ · ln (φ ₁ / φ ₀ ), -1 / μ · ln (φ ₂ / φ ₀ )) values ΔT, b + (T ₁ −a) · tan α values β, β + d · (cos θ-1 /) the value of cos [alpha]) epsilon, the "value B of _{(, d / (cosα · (} T 1 · tanα-ε) β-d / cosα-η · tanθ) / (ε-T 1 · tanθ) value a)" Can be calculated.

Further, based on the above relationship, the through hole 113 has a structure satisfying the following equation.

Ｐ_１＝ａ／ｃｏｓα
Ｐ_２＝（Ｔ１／ｃｏｓθ）−（ａ／ｃｏｓθ）
Ｔ_Ｂ＝Ｍｉｎ(Ｔ_０−ΔＴ，Ｔ_２−ΔＴ) _{tanα> T} o / T ₁

P ₁ = a / cos α
P ₂ = (T1 / cosθ)-(a / cosθ)
_{T B = Min (T 0 -ΔT} , T 2 -ΔT)

In other words, the through hole 113, satisfies tan [alpha and _T o / _{T 1} relationship between the _{tanα> T} o / T _1, the outer surface of the connecting portion and the second flow passage and the accommodating body between the first flow path and the connecting portion The distance from the first point where the straight line passing through the connection point with the second flow path intersects with the second flow path to the second point where the straight line intersects with the first flow path, and the distance t, P ₁ = defined by the above equation. linear _{P 1} is defined by a / cos [alpha], _{and, P 2 = (T 1 /} cosθ) - straight _{P 2} defined by (a / cos [theta]) _{is, T B = Min (T 0} -ΔT, T 2 - The geometric condition of the through hole is determined so as to satisfy the evaluation formula indicating that the reference plate thickness of the containment body is TB or more based on the dose of the high-dose substance defined by ΔT), and the geometric condition is the first. The first length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom of the flow path, and the first flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall. Includes the second length, the angle between the second flow path and the first direction, and the diameter of the through hole. Through holes 113, when a shape satisfying _{tanα> T} o / T _1, by satisfying the above relationships, it is possible to suppress a decrease in shielding performance due to the through hole 113.

Next, an example of a method for accommodating a high-dose substance using the storage container 1 according to the embodiment will be described with reference to FIG. FIG. 11 is a diagram for explaining an example in which the storage container 1 according to the present embodiment is used. FIG. 12 is a diagram for explaining the drying process of the storage container 1 according to the present embodiment.

As shown in FIGS. 11 and 12, the storage container 1 accommodating method includes process ST1, process ST2, process ST3, process ST4, process ST5, process ST6, and process ST7.

In step ST1, the storage container 1 has a storage body 10 arranged on the bottom surface 201 in the pool 200, and the high-dose substance 100 is stored in the storage portion 10s of the storage body 10.

In the step ST2, the lid 20 of the storage container 1 is set on the hanging tool 300, and is hung from the storage body 10 by the hanging tool 300. Then, in the step ST3, in the pool 200, the lid portion 20 of the storage container 1 is set in the accommodating main body 10 by the suspending tool 300, and the locking portion 301 of the suspending tool 300 is set in the suspending portion 10c of the accommodating main body 10. Is set to.

In the step ST4, in the storage container 1, the storage body 10 to which the lid 20 is attached is lifted above the water of the pool 200 by the hanging tool 300, and the water inside the storage body 10 is drained from the through hole 13. Specifically, in the storage container 1, the water inside the storage body 10 passes through the through hole 13 according to gravity and is discharged to the outside. In this case, since the storage container 1 has the refracting portion 13p in the through hole 13, the influence of the shielding defect by the through hole 13 can be suppressed.

In the step ST5, the outer surface 10b of the storage main body 10 is washed with water while the storage container 1 is suspended above the water of the pool 200. As a result, the radioactivity on the outer surface 10b of the storage container 1 is removed.

In step ST6, the storage container 1 is conveyed to the container storage place by the hanging tool 300, and the lid portion 20 is bolted to the storage main body 10. In addition, the container storage place includes, for example, a storage place for temporary storage at a nuclear power plant until it is carried out to a disposal facility. As a result, the storage container 1 is temporarily stored in the container storage place in a sealed state in which the high-dose substance 100 contained inside the storage body 10 is covered by the lid 20. When the step ST6 is completed, the process transitions to the step ST7 shown in FIG.

As shown in FIG. 12, in the step ST7, the storage container 1 is connected to the drying device 400, and the drying treatment is performed by the heated air supplied from the drying device 400 to the accommodating portion 10s of the accommodating main body 10. The drying device 400 has, for example, a heater for heating the supplied air and a blower for delivering the heated air. When the heated air from the drying device 400 is taken in from the intake hole 14, the storage container 1 moves the heated air inside the accommodating portion 10s to evaporate the moisture inside the accommodating portion 10s. The storage container 1 discharges the heated air inside the accommodating portion 10s from the through hole 13 to the drying device 400. When the storage container 10s dries, the storage container 1 is temporarily stored in the container storage place in a state where no water remains. As a result, the storage container 1 does not generate radiolytic gas or the like, so that the safety can be maintained. After that, the storage container 1 is stored in, for example, a transport container, a disposal container, or the like, and is carried out to a disposal facility.

As described above, the storage container 1 is formed with a through hole 13 in the accommodating body 10 that penetrates from the connecting portion 15 between the inner surface 11a of the bottom portion 11 and the inner surface 12e of the side wall portion 12 to the outside of the accommodating main body 10. One refracting portion 13p is formed. As a result, even if the high-dose substance 100 is stored in the storage body 1, the storage container 1 has the liquid and gas inside the storage body 10 from the through hole 13 in a state where the shielding defect is suppressed by the refracting portion 13p of the through hole 13. Etc. can be discharged. As a result, even if the storage container 1 is provided with the through hole 13, it is not necessary to store the storage container 1 in another container, so that the work of disposing of the high-dose substance 100 can be simplified without deteriorating the shielding performance. ..

Further, in the storage container 1, a through hole 13 is formed in the connecting portion 15 between the corner portion 122a of the side wall portion 12 and the inner surface 11a of the bottom portion 11. As a result, the storage container 1 can form a through hole 13 in the corner portion 122a, which is thicker than the side wall portion 12, in the rectangular storage body 10. That is, the storage container 1 can form a through hole 13 at a position where the distance from the inner surface 11a to the outer surface 10b of the storage body 10 is maximized. As a result, the storage container 1 can secure a range in which the through hole 13 is refracted, so that the shielding defect can be further suppressed.

Further, the storage container 1 can be formed in the storage main body 10 so that the through hole 13 and the intake hole 14 face each other with respect to the center point C. As a result, since the storage container 1 can circulate the gas taken in from the intake hole 14 and discharged from the through hole 13 inside the accommodating main body 10, the inside of the accommodating main body 10 can be efficiently dried.

Further, in the storage container 1, when the storage body 10 stores water, water can be discharged to the outside of the storage body 10 through the through hole 13. In the storage container 1, when the accommodating main body 10 is sucking heated air from the intake hole 14, the heated air can be discharged to the outside of the accommodating main body 10 through the through hole 13. As a result, the storage container 1 can discharge the heated air and water inside the storage body 10 from the through hole 13, so that the disposal work can be simplified without deteriorating the shielding performance. ..

Further, the storage container 1 has a first flow path 13a extending from the connecting portion 15 in the direction intersecting the vertical direction and a second flow path 13b refracting from the first flow path 13a and extending to the outside of the accommodating main body 10. A through hole 13 connected at 13p can be formed in the accommodating body 10. As a result, the storage container 1 can suppress the deterioration of the shielding performance due to the refraction between the first flow path 13a and the second flow path 13b, and discharge the liquid from the connecting portion 15 to the first flow path 13a. Efficiency can be improved.

In the above embodiment, in the storage container 1, the first flow path 13a of the through hole 13 has a steeper slope than the second flow path 13b, but the storage container 1 is not limited to this. The storage container 1 may be configured with a through hole 13 so that the first flow path 13a has a gentler inclination than the second flow path 13b, for example.

In the above embodiment, the storage container 1 has described the case where the through hole 13 is bent by one refracting portion 13p, but the storage container 1 is not limited to this. The storage container 1 may be configured such that, for example, a through hole having three or more flow paths is refracted in different directions by two or more refracting portions. In this case, by forming the storage container 1 at the corner of the storage main body 10, a sufficient distance can be secured from the inner surface to the outer surface.

1 Storage container 10 Storage body 10a Storage port 10b Outer surface 10c Suspension part 10s Storage part 11 Bottom part 11a Inner surface 11b, 11c Virtual line 12 Side wall part 12e Inner surface 13 Through hole 13a First flow path 13b Second flow path 13p Refraction part 14 Intake hole 15 Connecting part 20 Lid part 100 High-dose substance 121a, 121b, 121c, 121d Side surface 122a, 122b, 122c, 122d Square part 200 Pool 201 Pool bottom 300 Hanging tool 301 Locking part 400 Drying device

Claims (10)

A storage container having a storage body for storing a high-dose substance and a lid for closing the storage port of the storage body.
The containment body
At the bottom
A side wall that is connected to the bottom and extends along the vertical direction of the bottom,
A through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodating body,
Have,
A storage container characterized in that the through hole has at least one refracting portion. The side wall portion has a plurality of side surfaces and a corner portion that connects adjacent side surfaces at a predetermined angle.
The storage container according to claim 1, wherein the through hole is formed in the connecting portion between the inner surface of the bottom portion and the inner surface of the corner portion. The accommodating body further has an intake hole for sucking gas inside the accommodating body.
The storage container according to claim 1 or 2, wherein the intake hole is formed in a portion of the storage body facing the through hole with reference to the center point of the storage body. The through hole discharges the liquid to the outside of the accommodating body when the accommodating body contains the liquid, and when the accommodating body sucks the gas from the intake hole, the gas is discharged. The storage container according to claim 3, wherein the storage container is discharged to the outside of the storage body. The through hole has a first flow path extending from the connecting portion in a direction intersecting the vertical direction, and a second flow path refracting from the first flow path and extending to the outside of the accommodation body.
The storage container according to any one of claims 1 to 4, wherein the refracting portion is a portion of the through hole in which the first flow path and the second flow path are connected to each other. The through hole, the relationship between tan [alpha and _T o / _{T 1} satisfies the tanα ≦ _T o / _{T 1} following formula, wherein the connecting portion and the second flow path between the said first flow path connecting portion The distance from the first point where the straight line passing through the connection point with the outer surface of the accommodating body intersects the second flow path to the second point where the straight line intersects the first flow path, and

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = b / sin .alpha and, in the case of _{tanθ ≦ T o / T 1,} P 2 = (T 1 / cosθ) - (a / cosθ), tanθ > for _{T o / T 1, P 2} = (T 0 / sinθ) - straight _{P 2} defined by (a / cos [theta]) _is defined by _{T B = Min (T 0 -ΔT} , T 2 -ΔT) said high so as to satisfy the evaluation equation showing that dose material is the receiving body of the reference plate thickness T _B or based on dose, it determines the geometrical conditions of the through hole being,
The geometric conditions are the first length of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion of the first flow path, and the first length along the inner surface of the side wall portion. It is characterized by including a second length of the first flow path from the inner surface of the bottom in two directions, an angle formed by the second flow path and the first direction, and a diameter of the through hole. The storage container according to claim 5.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value η: T ₁ + d · sin θ value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A': ( β + d ・ cosθ-T ₁・ tanθ) / (β-η ・ tanθ) value B': d / (cosα ・ (β-η ・ tanθ)) value μ: Attenuation coefficient φ ₀ : Center point C of the housing body Nearby γ-ray bundle φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ-ray bundle of the part affected by the defect of the second flow path The through hole, tan [alpha and _T o / _{T 1} relationship between satisfies the _{tanα> T} o / T _1, connecting portion and the second flow path and said housing body and said connection portion and the first flow path The distance from the first point where the straight line passing through the connection point with the outer surface of the above intersects with the second flow path to the second point where the straight line intersects with the first flow path.

In defined as a distance _t, the straight line P1 defined by P 1 = a / cosα, _{and, P 2 = (T 1 /} cosθ) - (a / cosθ) straight P2 defined by _the, T B = Min ( Geometric conditions of the through hole so as to satisfy the evaluation formula indicating that the reference plate thickness TB or more of the accommodation body is based on the dose of the high-dose substance defined by T _{0 −} ΔT, T _{2 −} ΔT). Decide,
The geometric conditions are the first length of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion of the first flow path, and the first length along the inner surface of the side wall portion. It is characterized by including a second length of the first flow path from the inner surface of the bottom in two directions, an angle formed by the second flow path and the first direction, and a diameter of the through hole. The storage container according to claim 5.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Diameter of through hole α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T0: Of the storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ · ln (φ ₁ / φ ₀ ), -1 / μ · ln (Φ ₂ / φ ₀ )) value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A ″: (β − d / cos α −η · tan θ) / (Ε-T ₁ · tan θ)
_{B ": d / (cosα ·} (T 1 · tanα-ε))
μ: Attenuation coefficient φ ₀ : γ-ray bundle near the center point C of the accommodating body φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ of the part affected by the defect of the second flow path Line bundle The through hole has a ratio of a first length a in the vertical direction to a second length b in the horizontal direction of the first flow path 13a of 6.0 or less, and a second length b of 250 mm or less. 2. The storage container according to claim 6 or 7, wherein the angle between the flow path and the horizontal direction is 45 ° or less. It has an accommodating body for accommodating a high-dose substance and a lid portion for closing the accommodating port of the accommodating body, and the accommodating body is connected to a bottom portion and a side wall extending along the vertical direction of the bottom portion. Design of a storage container having a portion, a through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodating body, and the through hole having at least one refracting portion. The way,
The through hole has a first flow path extending from the connecting portion in a direction intersecting the vertical direction, and a second flow path refracting from the first flow path and extending to the outside of the accommodation body.
the relationship between the tanα and _T o / _{T 1} satisfies the tanα ≦ _T o / _{T 1,}
From the first point where the straight line passing through the connection point between the first flow path and the connection portion and the connection point between the second flow path and the outer surface of the accommodating body intersects with the second flow path, the straight line is the first. It is the distance to the second point where one flow path intersects, and

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = b / sin .alpha and, in the case of _{tanθ ≦ T o / T 1,} P 2 = (T 1 / cosθ) - (a / cosθ), tanθ > for _{T o / T 1, P 2} = (T 0 / sinθ) - straight _{P 2} defined by (a / cos [theta]) _is defined by _{T B = Min (T 0 -ΔT} , T 2 -ΔT) said high so as to satisfy the evaluation equation showing that dose material is the receiving body of the reference plate thickness T _B or based on dose, it determines the geometrical conditions of the through hole being,
The geometric conditions are the first length of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion of the first flow path, and the first length along the inner surface of the side wall portion. It is characterized by including a second length of the first flow path from the inner surface of the bottom in two directions, an angle formed by the second flow path and the first direction, and a diameter of the through hole. How to design a storage container.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value η: T ₁ + d · sin θ value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A': ( β + d ・ cosθ-T ₁・ tanθ) / (β-η ・ tanθ) value B': d / (cosα ・ (β-η ・ tanθ)) value μ: Attenuation coefficient φ ₀ : Center point C of the housing body Nearby γ-ray bundle φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ-ray bundle of the part affected by the defect of the second flow path It has an accommodating body for accommodating a high-dose substance and a lid portion for closing the accommodating port of the accommodating body. Design of a storage container having a portion, a through hole penetrating from the connecting portion between the inner surface of the bottom portion and the inner surface of the side wall portion to the outside of the accommodating body, and the through hole having at least one refracting portion. The way,
The through hole has a first flow path extending from the connecting portion in a direction intersecting the vertical direction, and a second flow path refracting from the first flow path and extending to the outside of the accommodation body.
the relationship between the tanα and _T o / _{T 1} satisfies the _{tanα> T} o / T _1,
From the first point where the straight line passing through the connection point between the first flow path and the connection portion and the connection point between the second flow path and the outer surface of the accommodating body intersects with the second flow path, the straight line is the first. It is the distance to the second point where one flow path intersects, and

In defined as a distance _t, the straight line _{P 1} is defined by P 1 = a / cos [alpha], _{and, P 2 = (T 1 /} cosθ) - linear _{P 2} defined by _{(a / cosθ), T B} = _{Min (T 0 -ΔT, T 2} -ΔT) so as to satisfy the evaluation equation showing that at the housing body of the reference plate thickness T _B above defined based on the dose of the high dose substance, of the through hole Determine the geometric conditions,
The geometric conditions are the first length of the first flow path from the inner surface of the side wall portion in the first direction along the inner surface of the bottom portion of the first flow path, and the first length along the inner surface of the side wall portion. It is characterized by including a second length of the first flow path from the inner surface of the bottom in two directions, an angle formed by the second flow path and the first direction, and a diameter of the through hole. How to design a storage container.
a: First length of the first flow path from the inner surface of the side wall in the first direction along the inner surface of the bottom b: First flow path from the inner surface of the bottom in the second direction along the inner surface of the side wall Second length d: Through hole diameter α: Angle formed by the second flow path and the first direction θ: Angle formed by the first flow path and the virtual line extending from the inner surface of the bottom to the side surface T ₀ : Storage container Bottom thickness T ₁ : Thickness of the corner where the storage body is cut diagonally T ₂ : Thickness of the side surface of the storage container ΔT = Min (-1 / μ ・ ln (φ ₁ / φ ₀ ), -1 / μ ・ln (φ ₂ / φ ₀ )) value β: b + (T ₁ −a) · tan α value ε: β + d · (cos θ-1 / cos α) value A ″: (β − d / cos α −η · tan θ ) / (Ε-T _1. tan θ)
_{B ": d / (cosα ·} (T 1 · tanα-ε))
μ: Attenuation coefficient φ ₀ : γ-ray bundle near the center point C of the accommodating body φ ₁ : γ-ray bundle of the part affected by the defect of the first flow path φ ₂ : γ of the part affected by the defect of the second flow path Line bundle

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