JP2020128920A - Sealing function check-up device for used fuel storage container - Google Patents

Sealing function check-up device for used fuel storage container Download PDF

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JP2020128920A
JP2020128920A JP2019021669A JP2019021669A JP2020128920A JP 2020128920 A JP2020128920 A JP 2020128920A JP 2019021669 A JP2019021669 A JP 2019021669A JP 2019021669 A JP2019021669 A JP 2019021669A JP 2020128920 A JP2020128920 A JP 2020128920A
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storage container
fuel storage
lid
spent fuel
space
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翔吾 浪岡
Shogo Namioka
翔吾 浪岡
清水　仁
Hitoshi Shimizu
清水　　仁
熊谷　直己
Naoki Kumagai
直己 熊谷
堂守　生剛
Seigo Domori
生剛 堂守
聡一朗 江草
Soichiro Egusa
聡一朗 江草
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Hitachi GE Nuclear Energy Ltd
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Hitachi GE Nuclear Energy Ltd
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Priority to JP2022163618A priority patent/JP2022185113A/en
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    • 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
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    • Y02E30/30—Nuclear fission reactors

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Abstract

To provide a sealing function check-up device of a used fuel storage container that reduces works large in burden on a working person at an apex of the used fuel storage container, and can check up a sealing function more safely.SOLUTION: A used fuel storage container 1 is to house and store a radioactive substance inside, and the used fuel storage container has a structure in which a primary lid 3 and secondary lid 4 sealed by a metal gasket 12 are attached to an opening part of the used fuel storage container. A device for checking up a sealing function of the used fuel storage container 1 comprises: a manometer 7 that measures a pressure of gas of an in-between lid space 6 provided between the primary lid 3 and the secondary lid 4; an inside piping 11 that causes the manometer 7 and the in-between lid space 6 to communicate; and a heat insulator 10 that covers the inside piping 11. The manometer 7 is set up in a set-up surface 20 of the used fuel storage container 1.SELECTED DRAWING: Figure 3

Description

本発明は、放射性物質を貯蔵する使用済燃料貯蔵容器の密閉状態を確認するための閉じ込め機能確認装置に関する。 The present invention relates to a confinement function confirmation device for confirming a sealed state of a spent fuel storage container that stores radioactive substances.

キャスクの複数箇所の物理量を簡易かつ安価な構成でモニタリングすることができ、温度と圧力を同時に計測でき、また放射線環境下においても高い耐久性を有するキャスク用モニタリング装置の一例として、特許文献１には、複数のキャスクの周辺に敷設された光ファイバと、圧力測定箇所に配置された圧力センサと、光ファイバを温度測定箇所に密着させる接着テープと、圧力を求めると共に温度を求め、かつ、各測定箇所の分布を特定する測定装置とを備える、ことが記載されている。 Patent Document 1 discloses an example of a cask monitoring device capable of monitoring physical quantities at a plurality of locations of a cask with a simple and inexpensive configuration, capable of simultaneously measuring temperature and pressure, and having high durability even in a radiation environment. Is an optical fiber laid around a plurality of casks, a pressure sensor arranged at a pressure measurement point, an adhesive tape for adhering the optical fiber to a temperature measurement point, pressure and temperature, and It is described that a measurement device that specifies the distribution of measurement points is provided.

特開２００２−４８８９８号公報JP 2002-48898 A

原子炉にて燃焼させた使用済燃料は高放射性物質を含んでおり、その崩壊熱が発生するために冷却する必要がある。このため、原子力発電所内のプールで一定期間冷却される。その後、使用済燃料は使用済燃料貯蔵容器に収納され、所定の輸送方法により原子力発電所内外の貯蔵施設に輸送され、そこで貯蔵される。 Spent fuel burned in a nuclear reactor contains highly radioactive substances and must be cooled in order to generate decay heat. Therefore, the pool in the nuclear power plant is cooled for a certain period. Then, the spent fuel is stored in a spent fuel storage container, transported to a storage facility inside or outside the nuclear power plant by a predetermined transportation method, and stored therein.

使用済燃料貯蔵容器では、一端が開口部を有する使用済燃料貯蔵容器の胴体に燃料収納バスケットを設け、その上で、使用済燃料を燃料収納バスケットに収納したのち、胴体の開口部に金属ガスケットを用いて一次蓋と二次蓋の二重の蓋を設置することで放射性物質を閉じ込めている。 In the spent fuel storage container, a fuel storage basket is provided on the body of the spent fuel storage container having an opening at one end, and after storing the spent fuel in the fuel storage basket, a metal gasket is placed at the opening of the body. The radioactive material is confined by installing a double lid with a primary lid and a secondary lid.

ここで、使用済燃料貯蔵容器は、胴体と一次蓋で囲まれた使用済燃料を収納する内部空間を負圧に、胴体と一次蓋と二次蓋で囲まれた蓋間空間を正圧に管理している。この状態を保持することで、一次蓋に設置した金属ガスケットを通じて一定以上のガスの漏えいが生じたとしても、圧力の高い蓋間空間から圧力の低い使用済燃料を収納した内部空間にガスを流入させることで放射性物質を含むガスが使用済燃料貯蔵容器の外部に漏れることを防止する設計となっている。 Here, the spent fuel storage container has a negative pressure in the internal space enclosed by the body and the primary lid to store the spent fuel, and a positive pressure in the inter-lid space enclosed by the body, the primary lid and the secondary lid. Manage. By maintaining this state, even if a certain amount of gas leaks through the metal gasket installed on the primary lid, the gas flows from the inter-lid space with high pressure into the internal space containing the spent fuel with low pressure. By doing so, it is designed to prevent the gas containing radioactive material from leaking to the outside of the spent fuel storage container.

そのため、蓋間空間から使用済燃料を収納した内部空間にガスが漏れ、使用済燃料を収納した内部空間の負圧を維持できなくなると、反対に放射性物質を含むガスが外部に漏れる可能性が生じる。このため、使用済燃料貯蔵容器の貯蔵期間中は蓋間空間のガスの圧力の変動を定期的に確認することで、蓋間空間からのガスの漏えいを監視して、所定の閉じ込め性能が保たれているか否かを確認している。 Therefore, if the gas leaks from the space between the lids to the internal space containing the spent fuel and the negative pressure in the internal space containing the spent fuel cannot be maintained, on the contrary, the gas containing radioactive substances may leak to the outside. Occurs. Therefore, during the storage period of the spent fuel storage container, by periodically checking the fluctuation of the gas pressure in the inter-lid space, the leakage of gas from the inter-lid space is monitored and the prescribed confinement performance is maintained. Checking whether it is dripping.

一般的に、蓋間空間のガスの圧力を測定する圧力計は二次蓋の上部に取り付けられており、使用済燃料貯蔵容器の頂部に設置されている。使用済燃料貯蔵容器は燃料集合体を縦に収納するため、一般的に頂部は地上から６メートル程度の高さにあたる。このため、頂部で作業する場合は高所作業となる。 Generally, a pressure gauge for measuring the gas pressure in the space between the lids is attached to the upper portion of the secondary lid and is installed on the top of the spent fuel storage container. Since the spent fuel storage container accommodates the fuel assembly vertically, the top is generally about 6 meters above the ground. For this reason, when working from the top, it is a high place work.

また、圧力計の指示値の変化は蓋間空間のガスの漏えいの程度を示しており、圧力計の指示値は放射性物質を使用済燃料貯蔵容器内に閉じ込めるうえで重要な役割を果たしている。このため、圧力計の精度を保証するために定期的に圧力計を校正している。 Further, the change in the indicated value of the pressure gauge indicates the degree of gas leakage in the space between the lids, and the indicated value of the pressure gauge plays an important role in confining the radioactive material in the spent fuel storage container. Therefore, the pressure gauge is regularly calibrated in order to guarantee the accuracy of the pressure gauge.

蓋間空間のガスの圧力を測定する圧力計は二系統有しており、圧力計の校正作業を行う場合は校正する圧力計と蓋間空間の間のバルブを閉じた後、校正する圧力計に圧力試験器を取り付けて、圧力試験器により圧力調整を行うことで校正を実施する。 There are two pressure gauges that measure the gas pressure in the space between the lids.When calibrating the pressure gauge, the pressure gauge to be calibrated is closed after closing the valve between the pressure gauge to be calibrated and the space between the lids. A pressure tester is attached to and the pressure is adjusted by the pressure tester for calibration.

従来は、校正する圧力計が使用済燃料貯蔵容器の頂部に設置されていることから、圧力計の校正作業をするために使用済燃料貯蔵容器の頂部周囲にアクセスすることができるよう昇降設備を設け、使用済燃料貯蔵容器の頂部周囲で作業できるように高所作業用の足場および墜落防止装置を設ける必要があった。 Conventionally, the pressure gauge to be calibrated is installed at the top of the spent fuel storage container. It was necessary to provide a scaffold for work at height and a fall prevention device so that work could be performed around the top of the spent fuel storage container.

これら昇降設備、高所作業用の足場および墜落防止装置を設けるためには、使用済燃料が貯蔵されている放射線管理区域内で設置作業を行う必要があり、作業員は設置作業を行っている時間に被ばくを受ける。これに対し、放射線防護の原則から、作業時間を短くし作業員が受ける被ばく線量を低減することが重要である。 In order to install these lifting equipment, scaffolding for work at heights, and fall prevention device, it is necessary to perform installation work in the radiation control area where spent fuel is stored, and workers are doing the installation work. Receive exposure in time. On the other hand, from the principle of radiation protection, it is important to shorten the working time and reduce the exposure dose to workers.

また、使用済燃料貯蔵容器の頂部まで昇降することや地上から６メートル程度の高さでの高所作業を行うことで墜落の可能性が懸念される。さらには、放射線防護服を装備することで作業性および視界が悪くなり転落の可能性が高くなることから、作業員への負担が大きい作業である。 In addition, there is a possibility of a fall by moving up and down to the top of the spent fuel storage container and performing work at a height of about 6 meters from the ground. Further, since the workability and visibility are deteriorated and the possibility of falling is increased by equipping the radiation protection suit, the work is a heavy burden on the worker.

本発明は上述の課題を解決するものであり、使用済燃料貯蔵容器の頂部での作業員への負担が大きい作業を減らし、より安全に閉じ込め機能の確認を行うことができる使用済燃料貯蔵容器の閉じ込め機能確認装置を提供することを目的とする。 The present invention is intended to solve the above-mentioned problems, reduce the burden on the operator of the spent fuel storage container that is heavy on the operator, and allow a safer confirmation of the confinement function. It is an object of the present invention to provide a device for confirming the confinement function of the.

本発明は、上記課題を解決する手段を複数含んでいるが、その一例を挙げるならば、内部に放射性物質を収納して貯蔵する使用済燃料貯蔵容器の閉じ込め機能を確認するための装置であって、前記使用済燃料貯蔵容器は、その開口部にそれぞれガスケットによってシールされた二重の蓋が取り付けられた構造となっており、前記閉じ込め機能確認装置は、前記二重の蓋の間に設けられた蓋間空間のガスの圧力を測定する圧力計と、前記圧力計と前記蓋間空間とを連絡させる延長配管と、前記延長配管を覆う断熱材と、を備え、前記圧力計は、前記使用済燃料貯蔵容器の設置面に設置されていることを特徴とする。 The present invention includes a plurality of means for solving the above problems, and one example thereof is a device for confirming the confining function of a spent fuel storage container that stores and stores radioactive substances inside. The spent fuel storage container has a structure in which a double lid sealed by a gasket is attached to each opening of the spent fuel storage container, and the confinement function confirmation device is provided between the double lids. A pressure gauge for measuring the pressure of the gas in the inter-lid space, an extension pipe for connecting the pressure gauge and the inter-lid space, and a heat insulating material covering the extension pipe, the pressure gauge, It is characterized in that it is installed on the installation surface of the spent fuel storage container.

本発明によれば、使用済燃料貯蔵容器の頂部での作業員への負担が大きい作業を減らし、より安全に閉じ込め機能の確認を行うことができるようになる。上記した以外の課題、構成および効果は、以下の実施形態の説明により明らかにされる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to confirm the confinement function more safely by reducing the work on the top of the spent fuel storage container that puts a heavy burden on the worker. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

本発明の監視対象となる使用済燃料貯蔵容器の斜視図である。It is a perspective view of the spent fuel storage container used as the object of monitoring of the present invention. 使用済燃料貯蔵容器に備え付けた一次蓋と二次蓋の蓋間空間の構造の一部と、実施形態の使用済燃料貯蔵容器の閉じ込め機能確認装置の概要とそとの接続状態を示した一部断面図である。A part of the structure of the space between the lids of the primary lid and the secondary lid provided in the spent fuel storage container, the outline of the device for confirming the confined function of the spent fuel storage container of the embodiment, and the connection state with the one are shown. FIG. 実施形態の使用済燃料貯蔵容器の閉じ込め機能確認装置の設置状態の様子と、圧力計の校正作業の概略を示した図である。It is the figure which showed the state of the installation state of the confinement function confirmation device of the spent fuel storage container of an embodiment, and the outline of the calibration work of a pressure gauge. 実施形態の使用済燃料貯蔵容器の閉じ込め機能確認装置における配管の断面の状態を示した断面図である。It is sectional drawing which showed the state of the cross section of the piping in the confinement function confirmation apparatus of the spent fuel storage container of embodiment.

本発明の使用済燃料貯蔵容器の閉じ込め機能確認装置の実施形態について図１乃至図４を用いて説明する。なお、この実施形態によりこの発明が限定されるものではない。 An embodiment of a confined function confirmation device for a spent fuel storage container according to the present invention will be described with reference to FIGS. 1 to 4. The present invention is not limited to this embodiment.

最初に、本発明における監視対象である使用済燃料貯蔵容器の概要について図１および図２を用いて説明する。図１は、使用済燃料貯蔵容器１の一部破断斜視図である。図２は図１の使用済燃料貯蔵容器１のうち、一次蓋３と二次蓋４の間の蓋間空間６の構造の一部や閉じ込め機能確認装置の概要を示した断面図である。 First, an outline of a spent fuel storage container to be monitored in the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a partially cutaway perspective view of a spent fuel storage container 1. FIG. 2 is a sectional view showing a part of the structure of the inter-lid space 6 between the primary lid 3 and the secondary lid 4 of the spent fuel storage container 1 of FIG. 1 and the outline of the confinement function confirmation device.

図１に示すように、使用済燃料貯蔵容器１は、胴体２、一次蓋３、二次蓋４から構成されており、胴体２の上部開口部に一次蓋３と二次蓋４という二重の蓋が設置される。これにより、使用済燃料貯蔵容器１では、図２に示すように、胴体２と一次蓋３で囲まれた使用済燃料を収納した内部空間５と、胴体２と一次蓋３と二次蓋４で囲まれた蓋間空間６と、が形成される。 As shown in FIG. 1, a spent fuel storage container 1 is composed of a body 2, a primary lid 3 and a secondary lid 4, and a double lid including a primary lid 3 and a secondary lid 4 is provided in an upper opening of the body 2. The lid of is installed. Thereby, in the spent fuel storage container 1, as shown in FIG. 2, the internal space 5 surrounded by the body 2 and the primary lid 3 for storing the spent fuel, the body 2, the primary lid 3, and the secondary lid 4 are provided. An inter-lid space 6 surrounded by is formed.

また、図２に示すように、一次蓋３および二次蓋４は胴体２と金属ガスケット１２を介して設置されており、この金属ガスケット１２によって一次蓋３と胴体２との間や、二次蓋４と胴体２との間がそれぞれシールされている。 Further, as shown in FIG. 2, the primary lid 3 and the secondary lid 4 are installed via the body 2 and the metal gasket 12, and the metal gasket 12 allows the space between the primary lid 3 and the body 2 and the secondary lid. The space between the lid 4 and the body 2 is sealed.

原子力発電所で発生した使用済燃料は使用済燃料貯蔵容器１の内部空間５内に収納され、一次蓋３および二次蓋４にて密封される。 The spent fuel generated in the nuclear power plant is stored in the internal space 5 of the spent fuel storage container 1 and sealed by the primary lid 3 and the secondary lid 4.

その上で、使用済燃料貯蔵容器１では、その放射性物質の閉じ込め機能の設計は、使用済燃料を収納している内部空間５を負圧に、蓋間空間６を正圧にしている。例えば、使用済燃料を収納した内部空間５を負圧に、蓋間空間を正圧になるようにガス（例えば、ヘリウム）を充填する。 In addition, in the spent fuel storage container 1, the design of the function of confining the radioactive material makes the internal space 5 storing the spent fuel a negative pressure and the inter-lid space 6 a positive pressure. For example, a gas (for example, helium) is filled so that the internal space 5 containing the spent fuel has a negative pressure and the space between the lids has a positive pressure.

これにより、金属ガスケット１２を通じて万が一ガスの漏えいが生じても、圧力の高い蓋間空間６から圧力の低い使用済燃料を収納した内部空間５に流れるため、放射性物質を含むガスが使用済燃料貯蔵容器１の外部に漏れることを防止する設計である。 As a result, even if a gas leak occurs through the metal gasket 12, the gas containing the radioactive material flows from the inter-lid space 6 having a high pressure into the internal space 5 containing the spent fuel having a low pressure, so that the gas containing the radioactive substance is stored. It is designed to prevent leakage to the outside of the container 1.

ここで、蓋間空間６から使用済燃料を収納した内部空間５にガスが漏れることで使用済燃料を収納した内部空間５の圧力が上昇し、負圧を維持できなくなると、使用済燃料を収納した内部空間５から蓋間空間６を通じて使用済燃料貯蔵容器１の外部にガスが流れ、放射性物質を含むガスが漏えいする可能性が生じる。そのため、蓋間空間６のガスの圧力の低下を確認し、蓋間空間６のガスの漏えいの程度を監視する必要がある。 Here, when gas leaks from the inter-lid space 6 into the internal space 5 containing the spent fuel, the pressure in the internal space 5 containing the spent fuel rises, and when the negative pressure cannot be maintained, the spent fuel is removed. Gas may flow from the stored internal space 5 to the outside of the spent fuel storage container 1 through the space 6 between the lids, and the gas containing a radioactive substance may leak. Therefore, it is necessary to confirm the decrease in gas pressure in the inter-lid space 6 and monitor the degree of gas leakage in the inter-lid space 6.

このために、使用済燃料貯蔵容器１では、二次蓋４の穴を介して蓋間空間６に接続した圧力計７により、閉じ込められた蓋間空間６のガスの圧力を測定する。 For this reason, in the spent fuel storage container 1, the pressure of the gas in the enclosed lid space 6 is measured by the pressure gauge 7 connected to the lid space 6 through the hole of the secondary lid 4.

蓋間空間６からのガスの漏えいは、蓋間空間６のガスの圧力を測定する圧力計７の指示値の傾向より分かることから、圧力計７の指示値の記録を集積室に送信し、放射線管理区域外から状態を監視する。 Gas leakage from the inter-lid space 6 can be understood from the tendency of the indicated value of the pressure gauge 7 that measures the pressure of the gas in the inter-lid space 6, so a record of the indicated value of the pressure gauge 7 is transmitted to the accumulation chamber. Monitor the condition from outside the radiation controlled area.

更に、圧力計７の指示値は、蓋間空間６からのガスの漏えいの程度を判定する一指標であることから、その指示値の精度は重要である。このため、定期的に圧力計７を校正する必要がある。 Further, since the indication value of the pressure gauge 7 is an index for judging the degree of gas leakage from the inter-lid space 6, the accuracy of the indication value is important. Therefore, it is necessary to calibrate the pressure gauge 7 regularly.

ここで、圧力計の校正作業は、放射線管理区域外から遠隔的に実施することができないため、使用済燃料貯蔵容器１を貯蔵している放射線管理区域に入域して行う必要がある。 Here, since the pressure gauge calibration work cannot be performed remotely from outside the radiation control area, it is necessary to enter the radiation control area in which the spent fuel storage container 1 is stored.

この際、使用済燃料貯蔵容器１に収納している使用済燃料から放射線が発生していることから、放射線管理区域内に入域することで作業員が被ばくする。 At this time, since radiation is generated from the spent fuel stored in the spent fuel storage container 1, the worker is exposed by entering the radiation controlled area.

更に、従来では、蓋間空間６のガスの圧力を測定する圧力計は使用済燃料貯蔵容器１の頂部に設置されており、一般的に使用済燃料貯蔵容器１を縦置きに貯蔵することから、頂部は地上から６メートル程度の高さになり、圧力計の校正作業を行うために使用済燃料貯蔵容器１の頂部周囲までの昇降設備、高所作業用の足場および落下防止装置を設ける必要があった。 Furthermore, conventionally, a pressure gauge for measuring the gas pressure in the space 6 between the lids is installed at the top of the spent fuel storage container 1, and since the spent fuel storage container 1 is generally stored vertically, , The top is about 6 meters above the ground, and it is necessary to install lifting equipment to the periphery of the spent fuel storage container 1 to calibrate the pressure gauge, scaffolding for working at heights, and a fall prevention device. was there.

このように高所作業の安全を確保したうえで、使用済燃料貯蔵容器１の頂部まで移動し、圧力計の校正作業を行う必要があった。 In this way, it was necessary to move to the top of the spent fuel storage container 1 and calibrate the pressure gauge after ensuring the safety of work in high places.

更に、他の使用済燃料貯蔵容器１の運用の妨げになることから、圧力計の校正作業が終了次第、昇降設備、高所作業用の足場および落下防止装置の撤去を行う。 Further, since it hinders the operation of the other spent fuel storage container 1, the lifting equipment, the scaffolding for working at high places, and the fall prevention device are removed as soon as the pressure gauge calibration work is completed.

上述のとおり、圧力計の校正作業には放射線管理区域内で長時間の作業をすることから作業員の被ばく線量が多くなり、また、放射線防護服を装備することで作業性および視界が悪く転落の可能性が高くなる。これらのことから、作業員への負担が大きい作業である。 As mentioned above, the pressure gauge calibration work requires a long period of work in the radiation controlled area, so the exposure dose to workers increases, and the workability and visibility are poor due to the provision of radiation protection suits. Will be more likely. For these reasons, the work is a heavy burden on workers.

放射線防護の原則から、作業時間を短くし作業員が受ける被ばく線量を低減することが重要である。そのため、圧力計７の校正作業にかかる時間を低減し、作業員への被ばく線量を小さくすることが可能な本発明の使用済燃料貯蔵容器の閉じ込め機能確認装置について図２乃至図４を用いて以下説明する。図３は、使用済燃料貯蔵容器設置面近傍で圧力計７の校正作業を行う場合の状態を示した図である。図４は、配管の断面の状態を示した断面図である。 From the principle of radiation protection, it is important to reduce the working time and the exposure dose to workers. Therefore, the device for confirming the confining function of the spent fuel storage container of the present invention, which can reduce the time required for the calibration work of the pressure gauge 7 and reduce the exposure dose to the worker, will be described with reference to FIGS. 2 to 4. This will be described below. FIG. 3 is a diagram showing a state in which the pressure gauge 7 is calibrated near the installation surface of the spent fuel storage container. FIG. 4 is a sectional view showing a state of a section of the pipe.

図２乃至図４に示すように、本発明の閉じ込め機能確認装置は、一次蓋３および二次蓋４の間に設けられた蓋間空間６のガスの圧力を測定する圧力計７と、圧力計７と蓋間空間６とを連絡させる内側配管１１と、内側配管１１を覆う断熱材１０と、を備えている。 As shown in FIGS. 2 to 4, the confinement function confirmation device of the present invention includes a pressure gauge 7 for measuring the gas pressure in the inter-lid space 6 provided between the primary lid 3 and the secondary lid 4, and a pressure gauge 7. The inner pipe 11 that connects the total 7 and the space 6 between the lids and the heat insulating material 10 that covers the inner pipe 11 are provided.

これにより、蓋間空間６のガスの圧力を測定する圧力計７を内側配管１１および断熱材１０を備える配管８によって接続することで、図２および図３に示すように、圧力計７を使用済燃料貯蔵容器１の設置面２０に設置し、使用済燃料貯蔵容器１の設置面２０の近傍で圧力試験器９を取り付けることで校正作業を行えるようにしている。 As a result, by connecting the pressure gauge 7 for measuring the gas pressure in the space 6 between the lids with the inner pipe 11 and the pipe 8 including the heat insulating material 10, the pressure gauge 7 is used as shown in FIGS. 2 and 3. The calibration work can be performed by installing the spent fuel storage container 1 on the installation surface 20 and attaching the pressure tester 9 near the installation surface 20 of the spent fuel storage container 1.

また、図３に示すように、蓋間空間６のガスの圧力を測定する圧力計７は、完全に同一仕様の系統を二系統有している。 Further, as shown in FIG. 3, the pressure gauge 7 for measuring the pressure of the gas in the inter-lid space 6 has two systems having completely the same specifications.

ここで、圧力計７と蓋間空間６を繋ぐ配管８を設置面２０まで延長すると、配管８が外気と接する面積が大きくなり、配管８中のガスの温度が変化し、蓋間空間６のガスの圧力を示している圧力計７の指示値が敏感に変動することが考えられる。特に、使用済燃料貯蔵容器１は約６ｍと長いため、その影響が大きいと考えられる。圧力計７の指示値が外気の温度影響により敏感変動することによって、圧力計７の指示値のみで蓋間空間６に充填してあるガスが漏えいしたかどうかの判断が困難になることが考えられる。 Here, when the pipe 8 connecting the pressure gauge 7 and the space 6 between the lids is extended to the installation surface 20, the area where the pipe 8 contacts the outside air increases, the temperature of the gas in the pipe 8 changes, and the space 6 between the lids 6 changes. It is conceivable that the indicated value of the pressure gauge 7, which indicates the gas pressure, fluctuates sensitively. Especially, since the spent fuel storage container 1 is as long as about 6 m, it is considered that the influence is great. It may be difficult to judge whether the gas filled in the inter-lid space 6 has leaked only by the indication value of the pressure gauge 7 because the indication value of the pressure gauge 7 fluctuates sensitively due to the temperature influence of the outside air. To be

そこで、上述のように、配管８は外気の温度影響を受けないような断熱構造とすることが望まれる。具体的には、図４に示すように、二重配管の内側配管１１と外側の配管８との間に熱抵抗が大きい断熱材１０を敷きつめることで、外気の影響を受けずに蓋間空間６のガスの圧力を示させる。 Therefore, as described above, it is desired that the pipe 8 has a heat insulating structure that is not affected by the temperature of the outside air. Specifically, as shown in FIG. 4, by laying a heat insulating material 10 having a large thermal resistance between the inner pipe 11 and the outer pipe 8 of the double pipe, the space between the lids is not affected by the outside air. The pressure of the gas in the space 6 is indicated.

二重配管の内側配管１１と外側の配管８との間に敷き詰める断熱材１０の熱伝導率は例えば０．０４［Ｗ／ｍ・Ｋ］以下とすることが望ましい。この断熱材１０は、例えばヘリウム用の高分子材などを用いることができる。 The thermal conductivity of the heat insulating material 10 laid between the inner pipe 11 and the outer pipe 8 of the double pipe is preferably 0.04 [W/m·K] or less, for example. As the heat insulating material 10, for example, a polymer material for helium or the like can be used.

なお、内側配管１１および断熱材１０からなる配管８としては、特殊ナイロンなどで覆われたチューブなどを用いても、内側配管１１および配管８に金属配管、断熱材１０に上述のようなヘリウム用高分子材などを用いたりするなど、上述の外気の影響を受けない仕様であればよく、その仕様は特に限定されない。 Even if a tube covered with special nylon or the like is used as the pipe 8 including the inner pipe 11 and the heat insulating material 10, the inner pipe 11 and the pipe 8 are metal pipes, and the heat insulating material 10 is for helium as described above. The specifications are not particularly limited as long as the specifications are not affected by the outside air, such as using a polymer material.

また、蓋間空間６と圧力計７を繋いだ内側配管１１の容積を蓋間空間６の容積に比べて小さくすることが望ましい。例えば、蓋間空間６に比して１％以下にすることが望ましい。これにより、蓋間空間６と圧力計７を繋いだ配管８を延長したことによる蓋間空間６の容積への影響を極力小さくし、蓋間空間６からのガスの漏えい量を計算するときの誤差を小さくすることが望ましい。 Further, it is desirable that the volume of the inner pipe 11 connecting the inter-lid space 6 and the pressure gauge 7 be smaller than the volume of the inter-lid space 6. For example, it is desirable that the space is less than 1% of the space 6 between the lids. As a result, the influence on the volume of the inter-lid space 6 due to the extension of the pipe 8 connecting the inter-lid space 6 and the pressure gauge 7 is minimized, and the amount of gas leakage from the inter-lid space 6 is calculated. It is desirable to reduce the error.

このような閉じ込め機能確認装置により、圧力計７の校正作業を行う場合は、２系統のうちの一方の校正対象となる圧力計７と蓋間空間６の間の内側配管１１のうち圧力計７に近い部分に設けられているバルブ１３を閉じた後、校正する圧力計７に圧力試験器９を取り付けて、圧力試験器９により圧力調整を行うことで校正を実施する。 When the calibration work of the pressure gauge 7 is performed by such a confinement function confirmation device, the pressure gauge 7 in the inner pipe 11 between the pressure gauge 7 to be calibrated in one of the two systems and the inter-lid space 6 is measured. After closing the valve 13 provided at a portion close to, the pressure tester 9 is attached to the pressure gauge 7 to be calibrated, and the pressure is adjusted by the pressure tester 9 to perform the calibration.

次に、本実施形態の効果について説明する。 Next, the effect of this embodiment will be described.

上述した本実施形態における使用済燃料貯蔵容器１の閉じ込め機能を確認するための装置は、一次蓋３および二次蓋４の間に設けられた蓋間空間６のガスの圧力を測定する圧力計７と、圧力計７と蓋間空間６とを連絡させる内側配管１１と、内側配管１１を覆う断熱材１０と、を備え、圧力計７は、使用済燃料貯蔵容器１の設置面２０に設置されている。 The device for confirming the confinement function of the spent fuel storage container 1 in the above-described embodiment is a pressure gauge for measuring the gas pressure in the inter-lid space 6 provided between the primary lid 3 and the secondary lid 4. 7, an inner pipe 11 that connects the pressure gauge 7 and the space 6 between the lids, and a heat insulating material 10 that covers the inner pipe 11. The pressure gauge 7 is installed on the installation surface 20 of the spent fuel storage container 1. Has been done.

本発明によれば、蓋間空間６のガスの圧力を示す圧力計７の校正作業を使用済燃料貯蔵容器１の設置面２０近傍で行うことができるため、使用済燃料貯蔵容器１の頂部までの昇降設備、高所作業用の足場および落下防止装置を設置する必要がなくなる。このため、校正作業の前後準備に要する作業時間が短くなり、従来と同等の計測精度が確保されたうえで作業員が校正作業の開始から完了までに受ける被ばく線量を従来に比べて大きく低減することができる。また、高所作業がなくなることから、高所作業での転落災害の危険性をなくすことができる。 According to the present invention, since the calibration work of the pressure gauge 7 showing the gas pressure in the space 6 between the lids can be performed near the installation surface 20 of the spent fuel storage container 1, up to the top of the spent fuel storage container 1. Eliminates the need to install lifting equipment, scaffolding for work at heights, and fall prevention devices. For this reason, the work time required before and after the calibration work is shortened, the same measurement accuracy as before is secured, and the exposure dose received by the worker from the start to the completion of the calibration work is greatly reduced compared to the past. be able to. Further, since the work at high places is eliminated, it is possible to eliminate the risk of falling accidents at work at high places.

また、内側配管１１の容積を、蓋間空間６の容積に比べて小さくするため、内側配管１１を接続したことによる蓋間空間６の容積への影響を小さくすることができる。また、蓋間空間６からのガスの漏えい量を計算するときの誤差を小さくすることができる。更に、蓋間空間６の封入作業に要する時間が長くなることを最小限にとどめることができる。 Further, since the volume of the inner pipe 11 is smaller than the volume of the inter-lid space 6, it is possible to reduce the influence of the connection of the inner pipe 11 on the volume of the inter-lid space 6. Further, it is possible to reduce an error when calculating the amount of gas leaked from the space 6 between the lids. Furthermore, it is possible to minimize the increase in the time required for the work of filling the space 6 between the lids.

更に、断熱材１０の熱伝導率を０．０４［Ｗ／ｍ・Ｋ］以下とすることで、内側配管１１による圧力値の測定結果の変動をより確実に抑制することができる。 Furthermore, by setting the thermal conductivity of the heat insulating material 10 to 0.04 [W/m·K] or less, it is possible to more reliably suppress fluctuations in the measurement result of the pressure value by the inner pipe 11.

また、内側配管１１は、圧力計７に近い部分にバルブ１３を更に有することで、校正作業時におけるバルブ操作をより容易に行うことができるとともに、高所作業をより減らすことができる。 Further, since the inner pipe 11 further includes the valve 13 in a portion near the pressure gauge 7, the valve operation during the calibration work can be performed more easily, and the work at high places can be further reduced.

＜その他＞
なお、本発明は上記の実施形態に限られず、種々の変形、応用が可能なものである。上述した実施形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されない。 <Other>
The present invention is not limited to the above-mentioned embodiment, and various modifications and applications are possible. The above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

１…使用済燃料貯蔵容器
２…胴体
３…一次蓋
４…二次蓋
５…使用済燃料を収納した内部空間
６…蓋間空間
７…圧力計
８…配管
９…圧力試験器
１０…断熱材
１１…二重配管の内側配管（延長配管）
１２…金属ガスケット
１３…バルブ
２０…設置面 DESCRIPTION OF SYMBOLS 1... Spent fuel storage container 2... Body 3... Primary lid 4... Secondary lid 5... Internal space 6 containing spent fuel... Space between lids 7... Pressure gauge 8... Piping 9... Pressure tester 10... Insulating material 11... Inner piping of double piping (extension piping)
12... Metal gasket 13... Valve 20... Installation surface

Claims (4)

内部に放射性物質を収納して貯蔵する使用済燃料貯蔵容器の閉じ込め機能を確認するための装置であって、
前記使用済燃料貯蔵容器は、その開口部にそれぞれガスケットによってシールされた二重の蓋が取り付けられた構造となっており、
前記閉じ込め機能確認装置は、
前記二重の蓋の間に設けられた蓋間空間のガスの圧力を測定する圧力計と、
前記圧力計と前記蓋間空間とを連絡させる延長配管と、
前記延長配管を覆う断熱材と、を備え、
前記圧力計は、前記使用済燃料貯蔵容器の設置面に設置されている
ことを特徴とする閉じ込め機能確認装置。 A device for confirming the confinement function of a spent fuel storage container that stores and stores radioactive substances inside,
The spent fuel storage container has a structure in which double lids sealed by gaskets are attached to the openings thereof,
The confinement function confirmation device,
A pressure gauge for measuring the pressure of the gas in the inter-lid space provided between the double lids,
An extension pipe for connecting the pressure gauge and the space between the lids,
A heat insulating material covering the extension pipe,
The confinement function confirmation device, wherein the pressure gauge is installed on an installation surface of the spent fuel storage container. 請求項１に記載の閉じ込め機能確認装置において、
前記延長配管の容積を、前記蓋間空間の容積に比べて小さくする
ことを特徴とする閉じ込め機能確認装置。 The confinement function confirmation device according to claim 1,
The confinement function confirmation device is characterized in that the volume of the extension pipe is smaller than the volume of the space between the lids. 請求項１に記載の閉じ込め機能確認装置において、
前記断熱材の熱伝導率を０．０４［Ｗ／ｍ・Ｋ］以下とする
ことを特徴とする閉じ込め機能確認装置。 The confinement function confirmation device according to claim 1,
A confinement function confirmation device, wherein the heat conductivity of the heat insulating material is 0.04 [W/m·K] or less. 請求項１に記載の閉じ込め機能確認装置において、
前記延長配管は、前記圧力計に近い部分にバルブを更に有する
ことを特徴とする閉じ込め機能確認装置。 The confinement function confirmation device according to claim 1,
The confinement function confirmation device, wherein the extension pipe further has a valve in a portion near the pressure gauge.
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