JP2013185992A - Cooling system for spent fuel storage pool - Google Patents

Cooling system for spent fuel storage pool Download PDF

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JP2013185992A
JP2013185992A JP2012051954A JP2012051954A JP2013185992A JP 2013185992 A JP2013185992 A JP 2013185992A JP 2012051954 A JP2012051954 A JP 2012051954A JP 2012051954 A JP2012051954 A JP 2012051954A JP 2013185992 A JP2013185992 A JP 2013185992A
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spent fuel
fuel storage
storage pool
duct
pool
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Toshihiro Yoshii
敏浩 吉井
Miyuki Akiba
美幸 秋葉
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Toshiba Corp
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Toshiba Corp
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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
    • Y02E30/00—Energy generation of nuclear origin
    • 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

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Abstract

PROBLEM TO BE SOLVED: To allow semi-permanent cooling of pool water in a spent fuel storage pool even when all power supply is lost.SOLUTION: A cooling system 15 for spent fuel storage pool cools pool water of a spent fuel storage pool 10 which stores spent fuel 12 by submerging it in the pool water 11. It comprises: a cooling piping 16 which has a vertical part 19 disposed outside the spent fuel storage pool in a vertical direction and is provided with an upper end part 20 and a lower end part 21, respectively connected to the upper end and the lower end of the vertical part and communicating with the inside of the spent fuel storage pool 10; and a duct 17 which is disposed extending in a vertical direction outside the spent fuel storage pool 10, accommodates the cooling piping 16 therein and has an upper end opening 22 and a lower end opening 23 which are open to the atmosphere. It is configured in such a manner that the pool water 11 flowing into the cooling piping 16 from the upper end part 20 exchanges heat with air rising in the duct 17 and is cooled down.

Description

本発明は、原子力発電プラント等の原子炉設備に設置された使用済燃料貯蔵プールのプール水を冷却する使用済燃料貯蔵プール冷却システムに関する。   The present invention relates to a spent fuel storage pool cooling system that cools pool water in a spent fuel storage pool installed in a nuclear reactor facility such as a nuclear power plant.

地震や津波等の緊急事態が発生し、原子炉設備に冷却が必要となった場合には、例えば原子炉格納容器内の蒸気を低温の流体と熱交換して放熱する安全システムや、原子炉圧力容器内を冷却注水スプレーで注水することにより原子炉を冷却するシステム等が提案されている。   When an emergency such as an earthquake or tsunami occurs and the reactor equipment needs to be cooled, for example, a safety system that exchanges heat with the low-temperature fluid to dissipate heat in the reactor containment vessel, or a reactor A system for cooling a nuclear reactor by injecting water into a pressure vessel with a cooling water injection spray has been proposed.

例えば、特許文献１には、原子炉格納容器外に冷却水（プール水）を保有するプールが設置され、このプールに管式の熱交換器が設置され、この熱交換器内に原子炉格納容器内で発生した蒸気を導くことで、原子炉格納容器内の蒸気をプール水により凝縮して冷却し、これにより原子炉格納容器内の圧力を低下させるシステムが提案されている。   For example, in Patent Document 1, a pool that holds cooling water (pool water) is installed outside the reactor containment vessel, and a tubular heat exchanger is installed in the pool, and the reactor is stored in the heat exchanger. A system has been proposed in which steam generated in the vessel is led to condense the steam in the reactor containment vessel with the pool water and cool it, thereby reducing the pressure in the reactor containment vessel.

特開２００７−１７０８３２号公報JP 2007-170832 A

原子炉設備に地震や津波等の緊急事態が発生し、特に原子炉設備が外部電源を喪失し、電動ポンプ等を用いて作動する非常用原子炉冷却システムや使用済燃料貯蔵プール冷却系が動作しないような場合に備え、動力を要しない冷却システムが嘱望される。   An emergency such as an earthquake or tsunami occurs in the reactor equipment, especially the reactor equipment loses the external power supply, and the emergency reactor cooling system and the spent fuel storage pool cooling system that operate using an electric pump etc. operate In preparation for such a case, a cooling system that does not require power is desired.

この場合、特許文献１に記載のシステムでは、原子炉格納容器内の蒸気を、有限の冷却水（プール水）を冷源とし熱交換器により自然循環させて凝縮し冷却しているが、プール水の温度が上昇するに従い熱交換の性能が徐々に低下し、半永久的には冷却効果を持続できない恐れがある。   In this case, in the system described in Patent Document 1, the steam in the reactor containment vessel is condensed and cooled by circulating naturally through a heat exchanger using finite cooling water (pool water) as a cold source. As the temperature of water rises, the performance of heat exchange gradually decreases, and there is a possibility that the cooling effect cannot be sustained semipermanently.

本発明の目的は、上述の事情を考慮してなされたものであり、全電源喪失時においても使用済燃料貯蔵プールのプール水を半永久的に冷却できる使用済燃料貯蔵プール冷却システムを提供することにある。   An object of the present invention is to provide a spent fuel storage pool cooling system capable of semi-permanently cooling the pool water of the spent fuel storage pool even when the entire power source is lost. It is in.

本発明は、使用済燃料をプール水に水没させて保管する使用済燃料貯蔵プールの前記プール水を冷却する使用済燃料貯蔵プール冷却システムであって、垂直部が前記使用済燃料貯蔵プールの外側に垂直方向に配設されると共に、この垂直部の上端と下端にそれぞれ接続された上側端部、下側端部が前記使用済燃料貯蔵プールの内部に連通して設けられた冷却用配管と、前記使用済燃料貯蔵プールの外側に垂直方向に延在して配置されると共に、内部に前記冷却用配管を収容し、上端開口及び下端開口が大気に開放されたダクトとを有し、前記冷却用配管内に前記上側端部から流入する前記プール水が、前記ダクト内を上昇する空気と熱交換して冷却可能に構成されたことを特徴とするものである。   The present invention is a spent fuel storage pool cooling system for cooling the pool water of a spent fuel storage pool that stores the spent fuel immersed in the pool water, wherein a vertical portion is outside the spent fuel storage pool. And an upper end and a lower end connected to the upper end and the lower end of the vertical portion, respectively, and a cooling pipe provided in communication with the spent fuel storage pool. And a duct that extends vertically outside the spent fuel storage pool, accommodates the cooling pipe therein, and has an upper end opening and a lower end opening opened to the atmosphere, The pool water flowing from the upper end into the cooling pipe is configured to be able to cool by exchanging heat with the air rising in the duct.

本発明によれば、使用済燃料貯蔵プールの外側に配設された冷却用配管に、その上側端部からプール水が流入することで、冷却用配管を収容するダクト内で空気がその密度差により上昇する。この空気の上昇流によって冷却用配管内のプール水が冷却され、この冷却用配管内のプール水がその密度差により使用済燃料貯蔵プールとの間で循環することで、全電源喪失時においても使用済燃料貯蔵プールのプール水を半永久的に冷却できる。   According to the present invention, the pool water flows into the cooling pipe disposed outside the spent fuel storage pool from the upper end thereof, so that the air has a density difference in the duct housing the cooling pipe. It rises by. The pool water in the cooling pipe is cooled by this upward flow of air, and the pool water in the cooling pipe circulates between the spent fuel storage pool due to the density difference, so even when the entire power supply is lost. The pool water in the spent fuel storage pool can be cooled semipermanently.

本発明に係る使用済燃料貯蔵プール冷却システムの第１実施形態を示す構成図。The block diagram which shows 1st Embodiment of the spent fuel storage pool cooling system which concerns on this invention. 図１の冷却用配管及びダクトを拡大して示す拡大縦断面図。FIG. 2 is an enlarged longitudinal sectional view showing the cooling pipe and duct of FIG. 1 in an enlarged manner. 図２のＩＩＩ−ＩＩＩ線に沿う断面図。Sectional drawing which follows the III-III line | wire of FIG. 図２のＩＶ矢視図。The IV arrow line view of FIG. （Ａ）は、図２の冷却用配管の変形形態を示す横断面図、（Ｂ）は、図２の冷却用配管の他の変形形態を示す横断面図。(A) is a cross-sectional view showing a modified form of the cooling pipe in FIG. 2, and (B) is a cross-sectional view showing another modified form of the cooling pipe in FIG. 本発明に係る使用済燃料貯蔵プール冷却システムの第２実施形態を示す構成図。The block diagram which shows 2nd Embodiment of the spent fuel storage pool cooling system which concerns on this invention. 本発明に係る使用済燃料貯蔵プール冷却システムの第３実施形態を示す構成図。The block diagram which shows 3rd Embodiment of the spent fuel storage pool cooling system which concerns on this invention.

以下、本発明を実施するための実施形態を図面に基づき説明する。
［Ａ］第１実施形態（図１〜図５）
図１は、本発明に係る使用済燃料貯蔵プール冷却システムの第１実施形態を示す構成図である。この図１に示す使用済燃料貯蔵プール１０は、原子力発電プラントなどの原子炉設備における図示しない原子炉建屋内で、原子炉圧力容器を格納する原子炉格納容器（共に図示せず）の外側に設置されている。この使用済燃料貯蔵プール１０は矩形形状であって、プール水（冷却水）１１で満たされ、原子炉圧力容器内で使用された使用済燃料１２をプール水１１に水没させて冷却し、この状態で保管する。この使用済燃料１２は、使用済燃料貯蔵プール１０の底面１３に設置されている。 Embodiments for carrying out the present invention will be described below with reference to the drawings.
[A] First embodiment (FIGS. 1 to 5)
FIG. 1 is a configuration diagram showing a first embodiment of a spent fuel storage pool cooling system according to the present invention. The spent fuel storage pool 10 shown in FIG. 1 is located outside a reactor containment vessel (not shown) for storing a reactor pressure vessel in a reactor building (not shown) in a nuclear reactor facility such as a nuclear power plant. is set up. The spent fuel storage pool 10 has a rectangular shape and is filled with pool water (cooling water) 11. The spent fuel 12 used in the reactor pressure vessel is submerged in the pool water 11 and cooled. Store in condition. The spent fuel 12 is installed on the bottom surface 13 of the spent fuel storage pool 10.

本実施形態の使用済燃料貯蔵プール冷却システム１５は、使用済燃料貯蔵プール１０のプール水１１を、電動モータなどの動的機器を用いることなく冷却するものであり、冷却用配管１６、ダクト１７、及び隔壁としての邪魔板１８を有して構成される。   The spent fuel storage pool cooling system 15 of the present embodiment cools the pool water 11 of the spent fuel storage pool 10 without using dynamic equipment such as an electric motor, and includes a cooling pipe 16 and a duct 17. And a baffle plate 18 as a partition wall.

冷却用配管１６は複数本設けられ、それぞれが、垂直方向に延びる垂直部１９と、この垂直部１９の上端に接続された上側端部２０と、垂直部１９の下端に接続された下側端部２１とを有してなる。各冷却用配管１６の垂直部１９は、使用済燃料貯蔵プール１０の側壁の外側に垂直方向に配設される。また、各冷却用配管１６の上側端部２０及び下側端部２１は使用済燃料貯蔵プール１０の内部に連通され、このうちの上側端部２０が使用済燃料貯蔵プール１０内のプール水１１の水面１１Ａ下付近に設けられ、下側端部２１が使用済燃料貯蔵プール１０の底面１３上付近に設けられる。   A plurality of cooling pipes 16 are provided, each of which has a vertical portion 19 extending in the vertical direction, an upper end portion 20 connected to the upper end of the vertical portion 19, and a lower end connected to the lower end of the vertical portion 19. Part 21. The vertical portion 19 of each cooling pipe 16 is disposed in the vertical direction outside the side wall of the spent fuel storage pool 10. Further, the upper end 20 and the lower end 21 of each cooling pipe 16 are communicated with the inside of the spent fuel storage pool 10, and the upper end 20 of these is the pool water 11 in the spent fuel storage pool 10. The lower end 21 is provided near the bottom surface 13 of the spent fuel storage pool 10.

前記ダクト１７は、図２及び図３にも示すように、例えば四角筒形状であり、使用済燃料貯蔵プール１０の側壁の外側に垂直方向に延在して配置されると共に、内部に複数本の冷却用配管１６を収容する。このダクト１７は、上端開口２２及び下端開口２３が大気に開放されている。冷却用配管１６内にその上側端部２０から流入する温度の高いプール水１１がダクト１７内で放熱することで、このダクト１７内の空気が温度変化によって密度差を生じ、これによりダクト１７内に空気の上昇流が発生する。冷却用配管１６内に流入しその垂直部１９を下降するプール水１１は、ダクト１１内で上昇する空気と熱交換して冷却される。   As shown in FIGS. 2 and 3, the duct 17 has, for example, a rectangular tube shape, and is arranged to extend in the vertical direction outside the side wall of the spent fuel storage pool 10. The cooling pipe 16 is accommodated. The duct 17 has an upper end opening 22 and a lower end opening 23 open to the atmosphere. The pool water 11 having a high temperature flowing into the cooling pipe 16 from the upper end portion 20 dissipates heat in the duct 17, so that the air in the duct 17 generates a density difference due to a temperature change. An upward flow of air is generated. The pool water 11 flowing into the cooling pipe 16 and descending the vertical portion 19 is cooled by exchanging heat with the air rising in the duct 11.

このとき、ダクト１７の長さＬは、冷却用配管１６の垂直部１９の長さＮよりも約１．３倍以上長く、好ましくは約２倍以上長く設定される。これにより、ダクト１７内では、冷却用配管１６内に流入したプール水１１の放熱によって、上端開口２２付近と下端開口２３付近とで空気の密度差が大きくなり、下端開口２３からダクト１７内により多くの空気が吸入されて、このダクト１７内で上昇する空気の流量を増大させることが可能になる。   At this time, the length L of the duct 17 is set to be longer than the length N of the vertical portion 19 of the cooling pipe 16 by about 1.3 times or more, preferably about 2 times or more. As a result, in the duct 17, due to heat radiation of the pool water 11 flowing into the cooling pipe 16, an air density difference between the upper end opening 22 and the lower end opening 23 increases, and from the lower end opening 23 to the inside of the duct 17. A lot of air is inhaled, and the flow rate of the air rising in this duct 17 can be increased.

前記邪魔板１８は、ダクト１７内で、このダクト１７の長手方向に所定間隔で複数枚配置される。これらの隣接する邪魔板１８には、ダクト１７の軸Ｏに対し互いに反対側の位置に空気流動用の開口２４が形成されている。これにより、ダクト１７内で上昇する空気は、矢印Ａに示すように邪魔板１８の空気流動用の開口２４を通り蛇行して上昇し、冷却用配管１６の垂直部１９に垂直方向に衝突して、垂直部１９内を流れるプール水１１との熱交換効率が高められる。   A plurality of the baffle plates 18 are arranged in the duct 17 at a predetermined interval in the longitudinal direction of the duct 17. These adjacent baffle plates 18 are formed with airflow openings 24 at positions opposite to each other with respect to the axis O of the duct 17. As a result, the air rising in the duct 17 rises by meandering through the air flow opening 24 of the baffle plate 18 as shown by the arrow A, and collides with the vertical portion 19 of the cooling pipe 16 in the vertical direction. Thus, the efficiency of heat exchange with the pool water 11 flowing in the vertical portion 19 is increased.

次に、作用を説明する。
この使用済燃料貯蔵プール冷却システム１５では、使用済燃料１２により加熱された使用済燃料貯蔵プール１０内のプール水１１は、その温度変化により生ずる密度差によって上方へ流れ、使用済燃料貯蔵プール１０におけるプール水１１の水面１１Ａ付近を冷却用配管１６の上側端部２０の方向へ流れ、この上側端部２０に吸い込まれる。この吸い込まれた温度の高いプール水１１は、冷却用配管１６内でダクト１７内の空気と熱交換して温度が低下し、垂直部１９内を下方へ流れる。 Next, the operation will be described.
In the spent fuel storage pool cooling system 15, the pool water 11 in the spent fuel storage pool 10 heated by the spent fuel 12 flows upward due to the density difference caused by the temperature change, and the spent fuel storage pool 10. In the vicinity of the water surface 11 </ b> A of the pool water 11, the water flows toward the upper end 20 of the cooling pipe 16 and is sucked into the upper end 20. The sucked pool water 11 having a high temperature is subjected to heat exchange with the air in the duct 17 in the cooling pipe 16 and the temperature is lowered, and flows downward in the vertical portion 19.

一方、冷却用配管１６内のプール水１１の放熱により加熱されたダクト１７内の空気は、その温度変化による密度差によって上昇し、下端開口２３から空気（大気）を吸い込む。この吸い込まれた空気は、ダクト１７内で、矢印Ａに示すように邪魔板１８の空気流動用の開口２４を通って蛇行しながら上昇し、冷却用配管１６の垂直部１９に垂直方向に衝突して、冷却用配管１６内のプール水１１を冷却する。   On the other hand, the air in the duct 17 heated by the heat radiation of the pool water 11 in the cooling pipe 16 rises due to the density difference due to the temperature change, and sucks air (atmosphere) from the lower end opening 23. The sucked air rises while meandering through the air flow opening 24 of the baffle plate 18 as indicated by an arrow A in the duct 17 and collides with the vertical portion 19 of the cooling pipe 16 in the vertical direction. Then, the pool water 11 in the cooling pipe 16 is cooled.

この冷却されたプール水１１は、冷却用配管１６の下側端部２１から使用済燃料貯蔵プール１０内に戻って使用済燃料１２を冷却する。このように、プール水１１は、使用済燃料貯蔵プール１０と冷却用配管１６との間で、その温度変化による密度差によって自然循環する。   The cooled pool water 11 returns to the spent fuel storage pool 10 from the lower end 21 of the cooling pipe 16 and cools the spent fuel 12. In this manner, the pool water 11 naturally circulates between the spent fuel storage pool 10 and the cooling pipe 16 due to the density difference due to the temperature change.

以上のように構成されたことから、本実施形態によれば次の効果（１）〜（３）を奏する。
（１）使用済燃料貯蔵プール１０の外側に配設された複数本の冷却用配管１６に、その上側端部２０からプール水１１が流入することで、冷却用配管１６を収容するダクト１７内の空気は、冷却用配管１６内の温度の高いプール水１１により加熱され、密度差によってダクト１７内を上昇する。このダクト１７内での空気の上昇流によって冷却用配管１６内のプール水１１が冷却され、この冷却用配管１６内のプール水１１はその密度差により使用済燃料貯蔵プール１０との間で循環する。この結果、全電源喪失時においても使用済燃料貯蔵プール１０のプール水１１を半永久的に冷却でき、使用済燃料貯蔵プール１０内の使用済燃料１２の崩壊熱を除去できる。 With the configuration as described above, the following effects (1) to (3) are achieved according to the present embodiment.
(1) The inside of the duct 17 that accommodates the cooling pipe 16 by the pool water 11 flowing into the plurality of cooling pipes 16 disposed outside the spent fuel storage pool 10 from the upper end 20 thereof. This air is heated by the pool water 11 having a high temperature in the cooling pipe 16 and rises in the duct 17 due to the density difference. Pool water 11 in the cooling pipe 16 is cooled by the upward flow of air in the duct 17, and the pool water 11 in the cooling pipe 16 circulates between the spent fuel storage pool 10 due to the density difference. To do. As a result, the pool water 11 of the spent fuel storage pool 10 can be semi-permanently cooled even when the entire power source is lost, and the decay heat of the spent fuel 12 in the spent fuel storage pool 10 can be removed.

（２）ダクト１７の長さＬが冷却用配管１６の垂直部１９の長さＮよりも約１．３倍以上長く設定されたので、ダクト１７内では、冷却用配管１６内のプール水１１の放熱により上端開口２２付近と下端開口２３付近とで空気の密度差が大きくなり、ダクト１７内に発生する空気の上昇流によって、下端開口２３からダクト１７内により多くの空気（大気）を吸い込むことができる。このため、ダクト１７内で上昇する空気流量が増大し、冷却用配管１６内のプール水１１とダクト１７内の空気との熱交換効率を向上させることができる。   (2) Since the length L of the duct 17 is set to be about 1.3 times longer than the length N of the vertical portion 19 of the cooling pipe 16, the pool water 11 in the cooling pipe 16 is set in the duct 17. Due to the heat radiation, the difference in the air density between the vicinity of the upper end opening 22 and the vicinity of the lower end opening 23 becomes large, and a large amount of air (atmosphere) is sucked into the duct 17 from the lower end opening 23 by the upward flow of air generated in the duct 17 be able to. For this reason, the air flow rate rising in the duct 17 increases, and the heat exchange efficiency between the pool water 11 in the cooling pipe 16 and the air in the duct 17 can be improved.

（３）ダクト１７内には、このダクト１７の長手方向に所定間隔で複数枚の邪魔板１８が配置され、隣接する邪魔板１８は、ダクト１７の軸Ｏに対し互いに反対側の位置に空気流動用の開口２４が形成されている。このため、ダクト１７内を上昇する空気は、邪魔板１８の空気流動用の開口２４を通り蛇行して上昇することになるので、この間に冷却用配管１６の垂直部１９と垂直方向に衝突する。従って、この構成からも、冷却用配管１６内を流れるプール水１１とダクト１７内を流れる空気との熱交換効率を向上させることができる。   (3) In the duct 17, a plurality of baffle plates 18 are arranged at a predetermined interval in the longitudinal direction of the duct 17, and the adjacent baffle plates 18 are located at positions opposite to each other on the axis O of the duct 17. A flow opening 24 is formed. Therefore, the air rising in the duct 17 meanders and rises through the air flow opening 24 of the baffle plate 18, and thus collides with the vertical portion 19 of the cooling pipe 16 in the vertical direction. . Therefore, also from this configuration, the heat exchange efficiency between the pool water 11 flowing in the cooling pipe 16 and the air flowing in the duct 17 can be improved.

尚、この第１実施形態におけるダクト１７では、図２及び図４に示すように、複数枚の邪魔板１８で仕切られた複数の区画のうち、上側に位置する区画（例えば図２の区画２５）を構成するダクト１７の側面に、ダクト１７の外側の空気（大気）をダクト１７内に直接導入するための空気導入用の開口２６が形成されてもよい。冷却用配管１６内を流れるプール水１１は、垂直部１９の上側端部２０に近い側で温度が高いので、空気導入用の開口２６からダクト１７内に導入される空気によってより効率的にプール水１１を冷却することができる。   In the duct 17 in the first embodiment, as shown in FIG. 2 and FIG. 4, the upper section (for example, the section 25 in FIG. 2) among the plurality of sections partitioned by the plurality of baffle plates 18. An air introduction opening 26 for directly introducing the air (atmosphere) outside the duct 17 into the duct 17 may be formed on the side surface of the duct 17 constituting the above. Since the pool water 11 flowing in the cooling pipe 16 has a high temperature on the side close to the upper end 20 of the vertical portion 19, the pool water 11 is more efficiently pooled by the air introduced into the duct 17 from the air introduction opening 26. The water 11 can be cooled.

また、第１実施形態における冷却用配管１６の垂直部１９には、図５（Ａ）に示すように外側に放熱フィン２７が固着されて、垂直部１９内のプール水１１とダクト１７内の空気との伝熱効率を向上させてもよい。あるいは、図５（Ｂ）に示すように、冷却用配管１６の垂直部２８は、扁平形状のプレート状チューブにより構成され、ダクト１７内を矢印Ａ方向に流れる空気との接触面積を増加させて、垂直部１９内のプール水１１とダクト１７内の空気との伝熱効率を向上させてもよい。   Further, in the vertical portion 19 of the cooling pipe 16 in the first embodiment, as shown in FIG. 5 (A), heat radiating fins 27 are fixed to the outside, and the pool water 11 in the vertical portion 19 and the duct 17 Heat transfer efficiency with air may be improved. Alternatively, as shown in FIG. 5B, the vertical portion 28 of the cooling pipe 16 is configured by a flat plate-like tube, and increases the contact area with the air flowing in the direction of arrow A in the duct 17. The heat transfer efficiency between the pool water 11 in the vertical portion 19 and the air in the duct 17 may be improved.

［Ｂ］第２実施形態（図６）
図６は、本発明に係る使用済燃料貯蔵プール冷却システムの第２実施形態を示す構成図である。この第２実施形態において、前記第１実施形態と同様な部分については、同一の符号を付すことにより説明を簡略化し、または省略する。 [B] Second Embodiment (FIG. 6)
FIG. 6 is a block diagram showing a second embodiment of the spent fuel storage pool cooling system according to the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

本第２実施形態の使用済燃料貯蔵プール冷却システム３０が前記第１実施形態と異なる点は、隔壁としての複数枚の邪魔板３１の構成である。つまり、複数枚の邪魔板３１は、隣接する邪魔板３１間で形成される空気の流路面積が下流側へ向かうほど漸次拡大するように、水平に対し角度θだけ斜めに配置されている。   The spent fuel storage pool cooling system 30 of the second embodiment is different from the first embodiment in the configuration of a plurality of baffle plates 31 as partition walls. That is, the plurality of baffle plates 31 are arranged obliquely at an angle θ with respect to the horizontal so that the flow path area of the air formed between the adjacent baffle plates 31 gradually increases toward the downstream side.

従って、本第２実施形態によれば、前記第１実施形態の効果（１）〜（３）と同様な効果を奏するほか、次の効果（４）を奏する。   Therefore, according to the second embodiment, in addition to the same effects as the effects (1) to (3) of the first embodiment, the following effect (4) is achieved.

（４）ダクト１７内に配置される複数枚の邪魔板３１は、隣接する邪魔板３１間で形成される空気の流路面積が下流側へ向かうほど漸次拡大するように、水平に対し角度θだけ斜めに設置されている。このため、ダクト１７内を蛇行して上昇する空気の流れがスムーズになる。このように、ダクト１７内で空気が流れ易くなるので、冷却用配管１６内のプール水１１とダクト１７内の空気との熱交換効率をより一層向上させることができる。   (4) The plurality of baffle plates 31 arranged in the duct 17 have an angle θ with respect to the horizontal so that the flow area of the air formed between the adjacent baffle plates 31 gradually increases toward the downstream side. Only installed diagonally. For this reason, the flow of the air which meanders in the duct 17 and rises becomes smooth. As described above, since air easily flows in the duct 17, the heat exchange efficiency between the pool water 11 in the cooling pipe 16 and the air in the duct 17 can be further improved.

［Ｃ］第３実施形態（図７）
図７は、本発明に係る使用済燃料貯蔵プール冷却システムの第３実施形態を示す構成図である。この第３実施形態において、前記第１実施形態と同様な部分については、同一の符号を付すことにより説明を簡略化し、または省略する。 [C] Third embodiment (FIG. 7)
FIG. 7 is a block diagram showing a third embodiment of the spent fuel storage pool cooling system according to the present invention. In the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

本第３実施形態の使用済燃料貯蔵プール冷却システム４０が前記第１実施形態と異なる点は、使用済燃料貯蔵プール１０内の上方に第１案内板４１が、使用済燃料貯蔵プール１０内の上下方向略中央位置に第２案内板４２が、それぞれ設置された点である。   The spent fuel storage pool cooling system 40 of the third embodiment is different from the first embodiment in that the first guide plate 41 is located above the spent fuel storage pool 10 in the spent fuel storage pool 10. The second guide plate 42 is installed at a substantially central position in the vertical direction.

第１案内板４１は、使用済燃料貯蔵プール１０の内部における冷却用配管１６の上側端部２０の上方に配置され、使用済燃料貯蔵プール１０に設置された使用済み燃料１２と冷却用配管１６の上側端部２０とを覆うように湾曲形状に形成されている。使用済燃料貯蔵プール１０内で使用済燃料１２にて加熱されたプール水１１は、その温度変化による密度差によって上方へ流れ、矢印Ｂに示すように、第１案内板４１に沿って冷却用配管１６の上側端部２０へスムーズに案内される。   The first guide plate 41 is disposed above the upper end 20 of the cooling pipe 16 inside the spent fuel storage pool 10, and the spent fuel 12 and the cooling pipe 16 installed in the spent fuel storage pool 10. It is formed in a curved shape so as to cover the upper end portion 20. The pool water 11 heated by the spent fuel 12 in the spent fuel storage pool 10 flows upward due to the density difference due to the temperature change, and is cooled along the first guide plate 41 as indicated by an arrow B. It is smoothly guided to the upper end 20 of the pipe 16.

また、第２案内板４２は、使用済燃料貯蔵プール１０の内部において冷却用配管１６の上側端部２０と下側端部２１との間に配置され、使用済燃料貯蔵プール１０内の使用済燃料１２よりも少し上方において水平状態に位置づけられる。冷却用配管１６内を流れてダクト１７内の空気により冷却されたプール水１１は、冷却用配管１６の下側端部２１から使用済燃料貯蔵プール１０内に流出するが、このとき第２案内板４２に案内されて、矢印Ｃに示すように、下側端部２１から使用済燃料貯蔵プール１０内の使用済燃料１２へ向かって流れ、この使用済燃料１２を効率的に冷却する。   The second guide plate 42 is disposed between the upper end 20 and the lower end 21 of the cooling pipe 16 inside the spent fuel storage pool 10, and is used in the spent fuel storage pool 10. It is positioned in a horizontal state slightly above the fuel 12. The pool water 11 that has flowed through the cooling pipe 16 and cooled by the air in the duct 17 flows out from the lower end portion 21 of the cooling pipe 16 into the spent fuel storage pool 10. Guided by the plate 42, as indicated by an arrow C, it flows from the lower end 21 toward the spent fuel 12 in the spent fuel storage pool 10, and the spent fuel 12 is efficiently cooled.

従って、本実施形態によれば、前記第１実施形態の効果（１）〜（３）と同様な効果を奏するほか、次の効果（５）を奏する。   Therefore, according to this embodiment, in addition to the same effects as the effects (1) to (3) of the first embodiment, the following effect (5) is achieved.

（５）使用済燃料貯蔵プール１０内では、冷却用配管１６の上側端部２０と使用済燃料１２とを覆うようにして湾曲形状の第１案内板４１が設置され、また、使用済燃料１２の少し上方に水平状態で第２案内板４２が設置されている。このため、使用済燃料貯蔵プール１０内で加熱されたプール水１１を第１案内板４１により冷却用配管１６の上側端部２０へ案内でき、且つ冷却用配管１６内で冷却されたプール水１１を、冷却用配管１６の下側端部２１から第２案内板４２によって、使用済燃料貯蔵プール１０内の使用済燃料１２へ案内できる。この結果、使用済燃料貯蔵プール１０内でのプール水１１の流れをスムーズに実施でき、使用済燃料貯蔵プール１０と冷却用配管１６との間でプール水１１の循環を円滑に実施できる。   (5) In the spent fuel storage pool 10, a curved first guide plate 41 is installed so as to cover the upper end 20 of the cooling pipe 16 and the spent fuel 12, and the spent fuel 12 The second guide plate 42 is installed in a horizontal state slightly above. Therefore, the pool water 11 heated in the spent fuel storage pool 10 can be guided to the upper end 20 of the cooling pipe 16 by the first guide plate 41, and the pool water 11 cooled in the cooling pipe 16 is used. Can be guided from the lower end 21 of the cooling pipe 16 to the spent fuel 12 in the spent fuel storage pool 10 by the second guide plate 42. As a result, the flow of the pool water 11 in the spent fuel storage pool 10 can be smoothly performed, and the pool water 11 can be smoothly circulated between the spent fuel storage pool 10 and the cooling pipe 16.

以上、本発明を上記実施形態に基づいて説明したが、本発明はこれに限定されるものではなく、その要旨を逸脱しない範囲で構成要素を種々変形してもよく、また、異なる実施形態にわたる構成要素を適宜組み合わせてもよい。   As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this, A component may be variously deformed in the range which does not deviate from the summary, and it covers different embodiment. You may combine a component suitably.

１０ 使用済燃料貯蔵プール
１１ プール水
１２ 使用済燃料
１５ 使用済燃料貯蔵プール冷却システム
１６ 冷却用配管
１７ ダクト
１８ 邪魔板（隔壁）
１９ 垂直部
２０ 上側端部
２１ 下側端部
２２ 上端開口
２３ 下端開口
２４ 空気流動用の開口
２５ 区画
２６ 空気導入用の開口
２７ 放熱フィン
２８ 垂直部
３０ 使用済燃料貯蔵プール冷却システム
３１ 邪魔板
４０ 使用済燃料貯蔵プール冷却システム
４１ 第１案内板
４２ 第２案内板
Ｌ、Ｎ 長さ
Ｏ 軸
θ 角度 10 spent fuel storage pool 11 pool water 12 spent fuel 15 spent fuel storage pool cooling system 16 cooling pipe 17 duct 18 baffle plate (partition wall)
DESCRIPTION OF SYMBOLS 19 Vertical part 20 Upper end part 21 Lower end part 22 Upper end opening 23 Lower end opening 24 Air flow opening 25 Compartment 26 Air introduction opening 27 Radiation fin 28 Vertical part 30 Spent fuel storage pool cooling system 31 Baffle plate 40 Spent fuel storage pool cooling system 41 First guide plate 42 Second guide plate L, N Length O Axis θ Angle

Claims (7)

使用済燃料をプール水に水没させて保管する使用済燃料貯蔵プールの前記プール水を冷却する使用済燃料貯蔵プール冷却システムであって、
垂直部が前記使用済燃料貯蔵プールの外側に垂直方向に配設されると共に、この垂直部の上端と下端にそれぞれ接続された上側端部、下側端部が前記使用済燃料貯蔵プールの内部に連通して設けられた冷却用配管と、
前記使用済燃料貯蔵プールの外側に垂直方向に延在して配置されると共に、内部に前記冷却用配管を収容し、上端開口及び下端開口が大気に開放されたダクトとを有し、
前記冷却用配管内に前記上側端部から流入する前記プール水が、前記ダクト内を上昇する空気と熱交換して冷却可能に構成されたことを特徴とする使用済燃料貯蔵プール冷却システム。 A spent fuel storage pool cooling system that cools the pool water of a spent fuel storage pool that stores the spent fuel immersed in pool water,
A vertical portion is vertically disposed outside the spent fuel storage pool, and an upper end and a lower end connected to the upper end and the lower end of the vertical portion are the interior of the spent fuel storage pool. Cooling piping provided in communication with
A duct extending in the vertical direction outside the spent fuel storage pool, accommodating the cooling pipe therein, and having a top opening and a bottom opening opened to the atmosphere;
The spent fuel storage pool cooling system, wherein the pool water flowing into the cooling pipe from the upper end portion can be cooled by exchanging heat with the air rising in the duct. 前記ダクト内には、その長手方向に所定間隔で複数枚の隔壁が配置され、これらの隣接する隔壁には、前記ダクトの軸に対し反対側の位置に空気流動用の開口が形成され、前記ダクト内の空気が前記空気流動用の開口を通り蛇行して上昇するよう構成されたことを特徴とする請求項１に記載の使用済燃料貯蔵プール冷却システム。 In the duct, a plurality of partition walls are arranged at predetermined intervals in the longitudinal direction, and an air flow opening is formed at a position opposite to the duct axis in these adjacent partition walls, The spent fuel storage pool cooling system according to claim 1, wherein the air in the duct is configured to meander and rise through the air flow opening. 前記隔壁は、これらの隣接する隔壁間で形成される空気の流路面積が下流へ向かうほど漸次拡大するように水平に対し斜めに設置されたことを特徴とする請求項２に記載の使用済燃料貯蔵プール冷却システム。 3. The used partition according to claim 2, wherein the partition wall is installed obliquely with respect to the horizontal so that an air flow path area formed between these adjacent partition walls gradually increases toward the downstream. Fuel storage pool cooling system. 前記使用済燃料貯蔵プール内には、冷却用配管の上側端部の上方に、この上側端部及び使用済燃料を覆い、前記使用済燃料により加熱されたプール水を前記上側端部へ案内する第１案内板が設置されたことを特徴とする請求項１乃至３のいずれか１項に記載の使用済燃料貯蔵プール冷却システム。 In the spent fuel storage pool, the upper end and the spent fuel are covered above the upper end of the cooling pipe, and the pool water heated by the spent fuel is guided to the upper end. The spent fuel storage pool cooling system according to any one of claims 1 to 3, wherein a first guide plate is provided. 前記使用済燃料貯蔵プール内には、冷却用配管の上側端部と下側端部との間に、前記下側端部から流出する冷却されたプール水を使用済燃料へ向かって案内する第２案内板が設置されたことを特徴とする請求項１乃至４のいずれか１項に記載の使用済燃料貯蔵プール冷却システム。 In the spent fuel storage pool, the cooled pool water flowing out from the lower end is guided between the upper end and the lower end of the cooling pipe toward the spent fuel. The spent fuel storage pool cooling system according to any one of claims 1 to 4, wherein two guide plates are installed. 前記ダクトには、複数枚の隔壁で仕切られた複数の区画のうち、上側に位置する区画を構成する前記ダクトの側面に、このダクトの外側の空気を前記ダクト内へ導入する空気導入用の開口が形成されたことを特徴とする請求項２乃至５のいずれか１項に記載の使用済燃料貯蔵プール冷却システム。 In the duct, air for introducing air outside the duct into the duct is formed on a side surface of the duct that constitutes an upper section of the plurality of sections partitioned by a plurality of partition walls. The spent fuel storage pool cooling system according to any one of claims 2 to 5, wherein an opening is formed. 前記冷却用配管は、外側に放熱フィンが設けられフィンチューブ、または扁平形状のプレート状チューブにより構成されたことを特徴とする請求項１乃至５のいずれか１項に記載の使用済燃料貯蔵プール冷却システム。 The spent fuel storage pool according to any one of claims 1 to 5, wherein the cooling pipe is configured by a fin tube or a flat plate-like tube provided with heat radiation fins on the outside. Cooling system.
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Cited By (4)

* Cited by examiner, † Cited by third party
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KR101815392B1 (en) * 2016-09-30 2018-01-04 한국수력원자력 주식회사 Heat exchanger and nuclear reactor building passive cooling system including the same
KR101915977B1 (en) * 2017-06-08 2018-11-07 한국원자력연구원 Passive containment cooling system of nuclear power plant
CN109830318A (en) * 2018-12-25 2019-05-31 清华大学天津高端装备研究院 A kind of spent fuel storage tank
CN113871044A (en) * 2021-08-12 2021-12-31 中广核研究院有限公司 Cooling control method and related equipment

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