JP3206421B2 - Spent fuel storage rack - Google Patents
Spent fuel storage rackInfo
- Publication number
- JP3206421B2 JP3206421B2 JP04243596A JP4243596A JP3206421B2 JP 3206421 B2 JP3206421 B2 JP 3206421B2 JP 04243596 A JP04243596 A JP 04243596A JP 4243596 A JP4243596 A JP 4243596A JP 3206421 B2 JP3206421 B2 JP 3206421B2
- Authority
- JP
- Japan
- Prior art keywords
- boron
- spent fuel
- stainless steel
- fuel storage
- storage rack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Fuel Cell (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、使用済燃料貯蔵ラ
ックに係り、特に沸騰水型原子力発電所で発生する使用
済燃料集合体を貯蔵するのに好適な使用済燃料貯蔵ラッ
クに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spent fuel storage rack, and more particularly to a spent fuel storage rack suitable for storing spent fuel assemblies generated in a boiling water nuclear power plant.
【０００２】[0002]
【従来の技術】原子炉から取り出された使用済燃料集合
体は、再処理工場へ搬出されるまでの間、原子力発電所
内の燃料貯蔵プールで貯蔵，冷却される。この場合、使
用済燃料集合体は、ステンレス鋼等で燃料貯蔵セルを構
成しかつ燃料貯蔵プール内に設置された使用済燃料貯蔵
ラック内に貯蔵される。使用済燃料集合体は、未臨界性
を保つために貯蔵セルを構成する材料の中性子吸収特性
及び水の遮蔽効果を考慮し、一定の間隔を保ちながら可
能な限り高密に貯蔵されることが好ましい。2. Description of the Related Art Spent fuel assemblies taken out of a nuclear reactor are stored and cooled in a fuel storage pool in a nuclear power plant until they are carried out to a reprocessing plant. In this case, the spent fuel assemblies constitute a fuel storage cell made of stainless steel or the like and are stored in a spent fuel storage rack installed in a fuel storage pool. It is preferable that the spent fuel assemblies are stored as densely as possible while maintaining a certain interval in consideration of the neutron absorption characteristics and water shielding effect of the material constituting the storage cell in order to maintain subcriticality. .
【０００３】例えば、特公平5−35397号公報のように、
ほう素を１重量％以下含有したオーステナイト系ステン
レス鋼（以下、ボロン含有ステンレス鋼という）の板を
曲げ加工して得られる角筒体を、使用済燃料集合体が１
体ずつ収納可能な間隔で市松模様状に配置することによ
り、使用済燃料集合体の貯蔵密度の高密度化を図ること
が考えられていた。For example, as disclosed in Japanese Patent Publication No. 5-35397,
A square cylinder obtained by bending a plate of austenitic stainless steel containing 1% by weight or less of boron (hereinafter referred to as boron-containing stainless steel) is used as a spent fuel assembly.
It has been considered to increase the storage density of the spent fuel assemblies by arranging them in a checkerboard pattern at intervals that can accommodate the bodies.
【０００４】一般的な沸騰水型原子力発電所の使用済燃
料貯蔵ラックに対して、天然ほう素（ボロン−１０を１
８.８ 重量％含有）を用いた場合、未臨界を維持するた
めには貯蔵されている使用済燃料集合体の相互の間隔を
約１６０mm確保する必要があった。For a spent fuel storage rack of a typical boiling water nuclear power plant, natural boron (boron-10) is used.
When 8.8% by weight is used, it is necessary to secure a distance between the stored spent fuel assemblies of about 160 mm in order to maintain the subcriticality.
【０００５】使用済燃料集合体の貯蔵間隔は、燃料集合
体の外形寸法から幾何学的に考えると約１５５mmまでは
縮小でき、高密度化を図ることができる。しかしなが
ら、上記公告公報に示された使用済燃料貯蔵ラックは、
１重量％以下の天然ほう素を含有する角筒体を用いてい
るため、使用済燃料集合体の貯蔵間隔を１５５mmまでに
する貯蔵密度の高密度化を達成することができないとい
う問題がある。[0005] The storage interval of the spent fuel assemblies can be reduced to about 155 mm when geometrically considered from the outer dimensions of the fuel assemblies, and the density can be increased. However, the spent fuel storage rack shown in the above publication is
Since a prismatic cylinder containing 1% by weight or less of natural boron is used, there is a problem in that it is not possible to achieve a high storage density in which the storage interval of spent fuel assemblies is reduced to 155 mm.
【０００６】一方、一般にオーステナイト系ステンレス
鋼にほう素を含有させるとボロン含有ステンレス鋼の延
性が低下することが知られており、１重量％以上では圧
延が困難であることに加え、角筒体が製造しにくいとい
う問題があった。[0006] On the other hand, it is generally known that when boron is added to austenitic stainless steel, the ductility of boron-containing stainless steel is reduced. However, there was a problem that it was difficult to manufacture.
【０００７】この問題を解決するための技術として、特
開平5−80188号公報及び特開平5−80189 号公報のよう
に、角筒体を市松模様状に配列する代わりにボロン含有
ステンレス鋼の板を正方格子状に組合せ同様の目的を達
成しようとしたものが考案されている。これらの技術を
用いて更に貯蔵密度向上を達成するためには、高濃度の
ほう素等の中性子吸収能力に優れた材料を用いる必要が
ある。しかしながら、高濃度ほう素化に伴う圧延程度
（板厚）とほう素添加量が材料の機械的性質に影響を及
ぼすことについては配慮されていなかった。As a technique for solving this problem, as disclosed in JP-A-5-80188 and JP-A-5-80189, instead of arranging square cylinders in a checkered pattern, a plate of boron-containing stainless steel is used. Have been devised to achieve the same object by combining the elements in a square lattice. In order to further improve the storage density by using these techniques, it is necessary to use a material having a high neutron absorption capacity such as high-concentration boron. However, no consideration has been given to the fact that the degree of rolling (thickness) and the amount of boron added due to high-concentration boronization affect the mechanical properties of the material.
【０００８】[0008]
【発明が解決しようとする課題】上記従来技術（特公平
5−35397号公報）は、ほう素量を１重量％以下である角
筒体を使用しているため、それ以上貯蔵効率を向上させ
ることは困難であった。また、特開平5−80188号公報及
び特開平5−80189号公報は、貯蔵効率の高い使用済燃料
ラックを提供するために必要なほう素添加量，遮蔽材の
板厚及び高濃度ほう素を添加することに伴う材料のラッ
ク材としての適用性については配慮されていなかった。SUMMARY OF THE INVENTION The above prior art (Japanese Patent Publication
No. 5-35397) uses a rectangular cylinder having a boron content of 1% by weight or less, so that it was difficult to further improve the storage efficiency. Further, JP-A-5-80188 and JP-A-5-80189 disclose the amount of boron, the thickness of the shielding material, and the high-concentration boron necessary to provide a spent fuel rack having high storage efficiency. No consideration was given to the applicability of the material as a rack material due to the addition.
【０００９】本発明の目的は、燃料集合体の外形寸法及
び挿入性から決まる幾何学的に最小の貯蔵燃料間距離と
することにより、燃料貯蔵密度を向上させることがで
き、かつ使用されるボロン含有ステンレス鋼の強度を確
保できる使用済燃料ラックを提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to improve the fuel storage density by using a geometrically minimum distance between stored fuels determined by the outer dimensions and insertability of the fuel assembly , and to increase the boron used. Check the strength of contained stainless steel
It is to provide a spent fuel rack that can be coercive.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成する本発
明の特徴は、使用済燃料集合体が１体ずつ収納される複
数の貯蔵セルを、遮蔽材により構成した使用済燃料貯蔵
ラックにおいて、前記遮蔽材がほう素を１重量％以上含
有しかつ圧延加工により微細化されたボラロイドを含む
ステンレス鋼であり、かつ前記遮蔽材の厚みが公称で５
mm以下であることにある。A feature of the present invention to achieve the above object is a spent fuel storage rack in which a plurality of storage cells each containing one spent fuel assembly are formed by a shielding material. The shielding material is a stainless steel containing 1% by weight or more of boron and containing a boloid which has been refined by rolling , and the shielding material has a nominal thickness of 5%.
mm or less.
【００１１】高濃度のほう素を添加したオーステナイト
系ステンレス鋼の板材は、燃料ラックセルの配列を幾何
学的に最も高密度化が可能な正方格子とするように作用
するとともに、使用済燃料から発生する熱中性子を吸収
することにより燃料ラックセル及び貯蔵燃料間距離を小
さくするように作用する。The austenitic stainless steel plate to which high-concentration boron is added acts to make the arrangement of the fuel rack cells geometrically the square lattice capable of achieving the highest density, and is generated from spent fuel. It acts to reduce the distance between the fuel rack cell and the stored fuel by absorbing thermal neutrons.
【００１２】公称板厚５mm以下の板材は、普通の圧延作
業で材料中に存在するボライドを微細化し、燃料ラック
として必要な機械的性質を得るように作用する。A plate having a nominal plate thickness of 5 mm or less serves to reduce the amount of boride present in the material in a normal rolling operation and to obtain the mechanical properties required for a fuel rack.
【００１３】[0013]
【発明の実施の形態】本発明による実施例を図１から図
５により説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS.
【００１４】原子力発電所から発生する使用済燃料集合
体は、再処理工場へ搬出されるまでの間、原子力発電所
内の使用済燃料貯蔵プール内で貯蔵，冷却される。The spent fuel assemblies generated from the nuclear power plant are stored and cooled in a spent fuel storage pool in the nuclear power plant before being transported to the reprocessing plant.
【００１５】この場合、使用済燃料集合体は、貯蔵プー
ル内に設置されたステンレス鋼製の使用済燃料貯蔵ラッ
クに貯蔵されるが、使用済燃料集合体は、未臨界性を保
つため貯蔵セルを構成する材料の中性子吸収能力及び水
の効果によって決まる一定の間隔を保ちながら保持され
る必要がある。In this case, the spent fuel assemblies are stored in a stainless steel spent fuel storage rack installed in a storage pool, and the spent fuel assemblies are stored in a storage cell to maintain subcriticality. It is necessary to keep the material at a constant interval determined by the neutron absorption capacity and the effect of water.
【００１６】従来の技術としては、図５及び図６に示す
ように中性子吸収能力に優れたボロン含有ステンレス鋼
製の角筒体４１を市松模様状に配列した使用済燃料貯蔵
ラックが使用されている。使用済燃料集合体が収納され
る貯蔵セル４２は、角筒体４１内及び４体の角筒体４１
に囲まれた空間に形成される。As a conventional technique, as shown in FIGS. 5 and 6, a spent fuel storage rack in which square cylinders 41 made of boron-containing stainless steel having excellent neutron absorption capacity are arranged in a checkered pattern is used. I have. The storage cells 42 in which the spent fuel assemblies are stored are inside the square cylinder 41 and the four square cylinders 41.
It is formed in the space surrounded by.
【００１７】しかしながら、中性子吸収材としてほう素
を含有したオーステナイト系ステンレス鋼は、添加する
ほう素量を増加させていくと図５に示すように伸びが低
下することが一般に知られている。図５の特性は、「核
燃料貯蔵及び輸送のためのボロン含有ステンレス鋼」
（ケー．ジェ．キング及びジェ．ウイルキンソン著，ス
テンレス鋼 '８４(ｐ３６８−３７８) インスティチュ
ト オブ メタルズ(1985)編（「Boron-containing sta
inless ateels for nuclear fuel storageand transpor
tation」（K.J.King and J.Wilkinson著，STAINLESS ST
EEL '８４(ｐ３６８−３７８) Institute of metals(１
９８５)編)）に示めされている。このため、使用済燃料
貯蔵ラックの角筒体４１の材料として使用する場合、オ
ーステナイト系ステンレス鋼に添加するほう素量は、１
重量％以下が適切とされている。この場合、沸騰水型原
子力発電所において、使用済燃料貯蔵ラック内に貯蔵さ
れている使用済燃料集合体相互の間の距離４３は、約１
６０mm必要となり、燃料集合体外形寸法より幾何学的に
与えられる貯蔵間隔約１５５mmに比べ大きい。However, it is generally known that elongation of an austenitic stainless steel containing boron as a neutron absorber decreases as the amount of boron added increases, as shown in FIG. The characteristic of Fig. 5 is "boron-containing stainless steel for nuclear fuel storage and transportation".
(K. J. King and J. Wilkinson, Stainless Steel '84 (p. 368-378) Institute of Metals (1985) (ed.
inless ateels for nuclear fuel storageand transpor
tation ”(KJKing and J. Wilkinson, STAINLESS ST
EEL '84 (p368-378) Institute of metals (1
985) ed.)). For this reason, when used as the material of the square cylinder 41 of the spent fuel storage rack, the amount of boron added to the austenitic stainless steel is 1
Weight percent or less is considered appropriate. In this case, in the boiling water nuclear power plant, the distance 43 between the spent fuel assemblies stored in the spent fuel storage rack is about 1 unit.
60 mm is required, which is larger than the storage interval of about 155 mm which is given geometrically from the outer dimensions of the fuel assembly.
【００１８】また、ボロン含有ステンレス鋼板を正方格
子状に配置してなる使用済燃料貯蔵ラックの場合、使用
済燃料集合体相互の間の距離は、貯蔵セル４２の幅とボ
ロン含有ステンレス鋼板の板厚を足し合わせたものと同
等となる。したがって、貯蔵密度を高めるためには、ボ
ロン含有ステンレス鋼板の板厚は薄いことが好ましい。In the case of a spent fuel storage rack in which boron-containing stainless steel plates are arranged in a square lattice, the distance between spent fuel assemblies is determined by the width of the storage cell 42 and the plate of the boron-containing stainless steel plate. It is equivalent to the sum of the thicknesses. Therefore, in order to increase the storage density, the thickness of the boron-containing stainless steel plate is preferably small.
【００１９】本発明の一実施例である使用済燃料貯蔵ラ
ックが図１及び図２に示される。この使用済燃料貯蔵ラ
ックは、ほう素含有量１重量％以上で板厚５mm以下のボ
ロン含有ステンレス鋼板１１を正方格子状に配列し、ボ
ロン含有ステンレス鋼板１１間に貯蔵セル１２を形成し
ている。使用済燃料集合体は、貯蔵セル１２内に収納さ
れる。A spent fuel storage rack according to one embodiment of the present invention is shown in FIGS. In this spent fuel storage rack, boron-containing stainless steel plates 11 having a boron content of 1% by weight or more and a plate thickness of 5 mm or less are arranged in a square lattice, and storage cells 12 are formed between the boron-containing stainless steel plates 11. . The spent fuel assemblies are stored in the storage cells 12.
【００２０】ボロン含有ステンレス鋼板１１内のボライ
ドは、圧延前のスラブの段階では網の目状に存在してお
り、圧延の過程で砕かれ微細化していく。ボロン含有ス
テンレス鋼板１１は、材料中に存在する微細化したボラ
イドの分散硬化により、マトリックスの変形抵抗を増
し、通常のほう素を含まないオーステナイト系ステンレ
ス鋼よりも強度が高くなる。The boron in the boron-containing stainless steel sheet 11 exists in a mesh shape at the stage of slab before rolling, and is crushed and refined in the rolling process. The boron-containing stainless steel sheet 11 increases the deformation resistance of the matrix due to the dispersion hardening of the finely-divided boron present in the material, and has a higher strength than ordinary austenitic stainless steel containing no boron.
【００２１】しかしながら、１重量％以上ほう素を添加
すると材料中のボライドのマトリックスに対する存在割
合が大きくなり、徐々に強度は飽和してくる傾向があ
る。However, when boron is added in an amount of 1% by weight or more, the proportion of boron in the material relative to the matrix increases, and the strength tends to gradually become saturated.
【００２２】このように、ボロン含有ステンレス鋼の強
度は、圧延の繰り返しで微細化、かつ、均質化するボラ
イドの存在によって得られるため、圧延における最終的
な肉厚をどの程度にするかは、使用済燃料貯蔵ラック材
として十分な強度を確保するうえで重要となる。As described above, the strength of the boron-containing stainless steel can be obtained by the presence of the boron which is refined and homogenized by repeated rolling. This is important for securing sufficient strength as a spent fuel storage rack material.
【００２３】図３にボロン含有ステンレス鋼板の製造方
法及び板厚の違いによるボロン含有ステンレス鋼の引張
強さの実験値を示す。ここで、■印は、小規模の材料を
実験室レベルで溶解し、少量ずつ鍛造し、十分ボライド
を微細化した板厚５mmのボロン含有ステンレス鋼、▲印
は、通常の圧延ラインで製造した板厚５mmのボロン含有
ステンレス鋼、及び●印は、通常の圧延ラインで製造し
た板厚４mmのボロン含有ステンレス鋼の引張試験で得ら
れた実験値を示す。FIG. 3 shows a method of manufacturing a boron-containing stainless steel sheet and experimental values of tensile strength of the boron-containing stainless steel depending on the thickness. Here, the symbol ■ indicates that a small-scale material was melted at the laboratory level, forged little by little, and boron-containing stainless steel with a plate thickness of 5 mm was sufficiently refined, and the symbol ▲ was manufactured on a normal rolling line. Boron-containing stainless steel with a thickness of 5 mm, and ● marks indicate experimental values obtained in a tensile test of a 4-mm-thick boron-containing stainless steel manufactured by a normal rolling line.
【００２４】図３で明らかなようにボライドを鍛造によ
り十分微細化した板厚５mmのボロン含有ステンレス鋼の
引張強さが、ほう素添加量１重量％以上の範囲で最も高
い値を示している。しかしながら、製品レベルでのボロ
ン含有ステンレス鋼板の製造は、多量に生産する必要が
あるため、一般の板材の製造と同様の設備を用いた圧延
によるのが効率的である。ところが、図３から分かるよ
うに圧延する板厚を増やすほどボロン含有ステンレス鋼
板の引張強さは低下する傾向にある。これは、ボロン含
有ステンレス鋼板の板厚による圧延時の圧下率の違いに
よるものである。圧下率を高くすればするほどボロン含
有ステンレス鋼板中に存在するボライドが微細化し、ボ
ロン含有ステンレス鋼板の引張強さが高くなる。As is apparent from FIG. 3, the tensile strength of a boron-containing stainless steel sheet having a thickness of 5 mm, in which boron is sufficiently refined by forging, shows the highest value in the range where the boron content is 1% by weight or more. . However, the production of a boron-containing stainless steel sheet at the product level requires a large amount of production, and therefore, it is efficient to perform rolling using the same equipment as that for producing a general sheet material. However, as can be seen from FIG. 3, the tensile strength of the boron-containing stainless steel sheet tends to decrease as the thickness of the rolled sheet increases. This is due to the difference in the rolling reduction during rolling depending on the thickness of the boron-containing stainless steel sheet. The higher the rolling reduction, the finer the boron present in the boron-containing stainless steel sheet and the higher the tensile strength of the boron-containing stainless steel sheet.
【００２５】したがって、使用済燃料貯蔵ラックに用い
る材料の引張強さが５２０Ｎ／mm2以上であることを考
慮すると、ボロン含有ステンレス鋼板１１の板厚として
は５mm以下であることが望ましい。Therefore, considering that the tensile strength of the material used for the spent fuel storage rack is 520 N / mm 2 or more, the thickness of the boron-containing stainless steel plate 11 is desirably 5 mm or less.
【００２６】ボロン含有ステンレス鋼板１１の板厚を５
mm以下のどの値にするかについては、本実施例の使用済
燃料貯蔵ラックが設置される原子力発電所の立地点の地
震力の強さに基づき決める必要がある。The thickness of the boron-containing stainless steel plate 11 is 5
It is necessary to determine which value is equal to or less than mm based on the strength of the seismic force at the location of the nuclear power plant where the spent fuel storage rack of this embodiment is installed.
【００２７】図４に、本実施例の使用済燃料貯蔵ラック
において、一例として貯蔵セル１２の幅１３を１５２mm
にした場合でのボロン含有ステンレス鋼板１１の板厚と
未臨界性上必要なほう素量の関係を示す。板厚５mmの場
合に必要となるほう素量は、０.９０ 重量％である。こ
のため、確実に未臨界性を確保するためには、ほう素含
有量下限値を１.００ 重量％にする必要がある。上限値
は、アメリカン ソサイアティ フォ テスティング
アンド マテリアル．デシグネーション：Ａ８８７−１
９８８（ＡＳＴＭ Ａ ８８７−１９８８）〔American
Society For testing and Materials. Designation：
Ａ ８８７−１９８８（ＡＳＴＭＡ ８８７−１９８
８）〕の同レベルの材料のほう素添加量範囲にもあるよ
うに材料製造上０.２５重量％の幅が必要であるため、
１.２５重量％とする。FIG. 4 shows, as an example, the width 13 of the storage cell 12 in the spent fuel storage rack of this embodiment is 152 mm.
The relationship between the thickness of the boron-containing stainless steel sheet 11 and the amount of boron necessary for subcriticality is shown below. The amount of boron required for a plate thickness of 5 mm is 0.90% by weight. For this reason, in order to ensure the subcriticality, the lower limit of the boron content needs to be 1.00% by weight. The upper limit is American Society for Testing
And Material. Designation: A887-1
988 (ASTM A 887-1988) [American
Society For testing and Materials. Designation:
A 887-1988 (ASTMA 887-198)
8)] Since the material production requires a width of 0.25% by weight as in the range of boron addition amount of the same level material,
1.25% by weight.
【００２８】板厚４mmの場合に必要となるほう素量は、
１.１６ 重量％であるため、確実に未臨界性を確保する
ためには、ほう素添加量１.２０重量％から１.４５重量
％となる。板厚３mmのボロン含有ステンレス鋼板１１
は、必要ほう素量が１.５６ 重量％であるため、ほう素
添加量は１.６０重量％から１.８５重量％となる。The amount of boron required for a plate thickness of 4 mm is
Since the content is 1.16% by weight, the amount of boron added is changed from 1.20% by weight to 1.45% by weight in order to ensure the subcriticality. 3mm-thick boron-containing stainless steel plate 11
Has a required boron content of 1.56% by weight, so that the boron addition amount is 1.60% by weight to 1.85% by weight.
【００２９】以上のことから、高密度貯蔵を目的とした
使用済燃料貯蔵ラックに用いるボロン含有ステンレス鋼
板１１の板厚は、信頼性及び材料の製造性の観点から板
厚５mm以下とすることが最も良い。From the above, the thickness of the boron-containing stainless steel plate 11 used in the spent fuel storage rack for high-density storage should be 5 mm or less from the viewpoint of reliability and material productivity. The best.
【００３０】以上は、ほう素添加量１重量％以上で、板
厚５mm以下のボロン添加ステンレス鋼板を正方格子状に
配列した燃料ラックの実施例を示したが、ほう素添加量
が１重量％以上のボロン添加ステンレス鋼でも角筒体が
製造できる場合には、板材の代わりに角筒体を市松模様
状に配列してもよい。The above is an example of a fuel rack in which boron-added stainless steel sheets having a thickness of 5 mm or less and a boron addition amount of 1% by weight or more are arranged in a square lattice. When a rectangular cylinder can be manufactured even with the above boron-added stainless steel, the rectangular cylinder may be arranged in a checkered pattern instead of the plate material.
【００３１】以上、本発明の実施例によれば、板厚を５
mmとすることにより、燃料ラックとして充分な材料強度
を有する使用済燃料貯蔵ラックを提供することができ
る。As described above, according to the embodiment of the present invention, the plate thickness is 5
By setting mm, a spent fuel storage rack having sufficient material strength as a fuel rack can be provided.
【００３２】[0032]
【発明の効果】本発明による使用済燃料貯蔵ラックは、
ほう素添加量１重量％以上で、板厚５mm以下のボロン含
有ステンレス鋼板を正方格子状に配列することにより、
実施例による効果の他に、信頼性が高く、かつ、貯蔵密
度を向上できると言う効果がある。更に、使用されるボ
ロン含有ステンレス鋼の強度を確保できるため、使用済
燃料貯蔵ラックとして必要な機械的性質を得ることがで
きる。 The spent fuel storage rack according to the present invention has the following features.
By arranging a boron-containing stainless steel plate having a boron content of 1% by weight or more and a plate thickness of 5 mm or less in a square lattice,
In addition to the effects of the embodiment, there is an effect that the reliability is high and the storage density can be improved. In addition, the
Used since the strength of stainless steel containing
The required mechanical properties as a fuel storage rack can be obtained.
Wear.
【図１】本発明の実施例である使用済燃料貯蔵ラックの
鳥瞰図である。FIG. 1 is a bird's-eye view of a spent fuel storage rack according to an embodiment of the present invention.
【図２】図１の局部横断面図である。FIG. 2 is a local cross-sectional view of FIG.
【図３】ボロン含有ステンレス鋼の板厚と引張強さの関
係を示す特性図である。FIG. 3 is a characteristic diagram showing a relationship between a plate thickness and a tensile strength of a boron-containing stainless steel.
【図４】ボロン含有ステンレス鋼の板厚と必要ほう素添
加量との関係を示す特性図である。FIG. 4 is a characteristic diagram showing the relationship between the thickness of boron-containing stainless steel and the required boron content.
【図５】従来の使用済燃料貯蔵ラックの鳥瞰図である。FIG. 5 is a bird's-eye view of a conventional spent fuel storage rack.
【図６】図５の局部横断面図である。FIG. 6 is a local cross-sectional view of FIG. 5;
【図７】ボロン含有ステンレス鋼におけるボロン含有量
と種々の機械特性との関係を示す特性図である。FIG. 7 is a characteristic diagram showing a relationship between boron content and various mechanical properties in boron-containing stainless steel.
１１…ボロン含有ステンレス鋼板、１２…貯蔵セル、１
３…貯蔵セル１２の幅。11: boron-containing stainless steel sheet, 12: storage cell, 1
3: width of the storage cell 12
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−248399（ＪＰ，Ａ) 特開 昭61−144597（ＪＰ，Ａ) 特開 昭61−153595（ＪＰ，Ａ) 実開 昭59−20197（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G21C 19/40 G21C 19/07 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-248399 (JP, A) JP-A-61-144597 (JP, A) JP-A-61-153595 (JP, A) 20197 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) G21C 19/40 G21C 19/07
Claims (4)
数の貯蔵セルを、遮蔽材により構成した使用済燃料貯蔵
ラックにおいて、前記遮蔽材がほう素を１重量％以上含
有しかつ圧延加工により微細化されたボラロイドを含む
ステンレス鋼であり、かつ前記遮蔽材の厚みが公称で５
mm以下であることを特徴とする使用済燃料貯蔵ラック。1. A spent fuel storage rack comprising a plurality of storage cells, each containing a single spent fuel assembly, made of a shielding material, wherein the shielding material contains 1% by weight or more of boron and is rolled. A stainless steel containing boloids fined by processing , and the shielding material has a nominal thickness of 5
Spent fuel storage rack, characterized by not more than mm.
項１の使用済燃料貯蔵ラック。2. The spent fuel storage rack according to claim 1, wherein said shielding members are arranged in a grid.
され、これらの角筒状体は千鳥状に配置されて互いに結
合されており、一部の前記貯蔵セルは前記角筒状体内に
形成され、他の前記貯蔵セルは４体の前記角筒状体に囲
まれて形成される請求項１の使用済燃料貯蔵ラック。3. A plurality of rectangular cylindrical bodies are constituted by the shielding material, and these rectangular cylindrical bodies are arranged in a staggered manner and are connected to each other, and a part of the storage cells is formed in the rectangular cylindrical body. 2. The spent fuel storage rack according to claim 1, wherein the other storage cells are formed by being surrounded by four of the rectangular tubular bodies.
数の貯蔵セルを、遮蔽材により構成した使用済燃料貯蔵Spent fuel storage consisting of a number of storage cells with shielding material
ラックにおいて、前記遮蔽材がほう素を０.９０ 重量％In the rack, the shielding material contains 0.90% by weight of boron.
含有しかつ圧延加工により微細化されたボラロイドを含Boraloid containing and micronized by rolling
むステンレス鋼であり、かつ前記遮蔽材の厚みが公称でStainless steel, and the thickness of the shielding material is nominally
５mmであることを特徴とする使用済燃料貯蔵ラック。A spent fuel storage rack having a size of 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04243596A JP3206421B2 (en) | 1996-02-29 | 1996-02-29 | Spent fuel storage rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04243596A JP3206421B2 (en) | 1996-02-29 | 1996-02-29 | Spent fuel storage rack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09236690A JPH09236690A (en) | 1997-09-09 |
| JP3206421B2 true JP3206421B2 (en) | 2001-09-10 |
Family
ID=12635997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04243596A Expired - Lifetime JP3206421B2 (en) | 1996-02-29 | 1996-02-29 | Spent fuel storage rack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3206421B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958155B (en) * | 2009-07-13 | 2012-11-21 | 中国核电工程有限公司 | Spent fuel storage grillage |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610287A (en) * | 2012-03-28 | 2012-07-25 | 中广核工程有限公司 | Spent fuel storage grillwork for nuclear power plant |
| CN108735316B (en) * | 2018-06-04 | 2024-02-09 | 江苏核电有限公司 | Stainless steel boron aluminum composite board for storage cells of VVER fuel assembly and manufacturing method |
-
1996
- 1996-02-29 JP JP04243596A patent/JP3206421B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958155B (en) * | 2009-07-13 | 2012-11-21 | 中国核电工程有限公司 | Spent fuel storage grillage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09236690A (en) | 1997-09-09 |
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