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地震・津波発生時の「もんじゅ」の安全確保の考え方と炉心冷却等に関する評価; 東北地方太平洋沖地震を踏まえたシビアアクシデント対応等検討委員会

External evaluation on the logical adequacy of the safety measures and coolability of the reactor core and others in Monju considering Earthquake and Tsunami; The Technical Committee on Severe Accident Countermeasures and others considering Tohoku district - off the Pacific Ocean Earthquake

FBRプラント工学研究センター; 敦賀本部 高速増殖炉研究開発センター; 敦賀本部 経営企画部

FBR Plant Engineering Center; Fast Breeder Reactor Research and Development Center, Tsuruga Head Office; Policy Planning and Co-ordination Department, Tsuruga Head Office

福島第一原子力発電所事故を踏まえ、地震・津波発生時のもんじゅにおける安全確保の考え方、炉心と炉外燃料貯蔵槽(EVST)の自然循環冷却及び燃料池の冷却の成立性について掲題委員会に報告し、その評価を受けた。委員会では、原子力機構から上記について説明を行い、以下の委員長によるまとめが行われた。(1)原子炉については、全交流電源喪失(SBO)が起こっても、流路が確保されている限り、自然循環は確保される。したがって、炉停止後、自然循環がある限り、崩壊熱の除去がなされ、炉心溶融は起こらないと言える。(2)EVSTについては、SBO時にも自然循環冷却による使用済燃料の冷却に期待でき、使用済燃料が高温になって溶融することはないと考えられる。(3)燃料池については、SBO時でも、使用済燃料を入れた缶詰缶の頂部が水の蒸発により露出するまでに2か月以上の時間猶予があるので、給水等の十分な対策を取り得ると考えられる。

The logical adequacy of the safety measures in Monju, coolability of the reactor core and the ex-vessel storage tank by natural circulation, and coolability of the spent fuel storage pool, considering Tohoku district - off the Pacific Ocean Earthquake were explained by Japan Atomic Energy Agency and reviewed in the above-titled committee. Main conclusions by the chairman of the committee are summarized as follows: (1) Natural circulation cooling is secured in the reactor after station blackout (SBO) as far as flow path exist. Therefore, the reactor core will never melt because of the decay heat removal as far as the natural circulation is reserved after the reactor shutdown; (2) Spent fuels will never melt due to temperature rise in the ex-vessel fuel storage system, since natural circulation cooling can be expected even after SBO; (3) It is possible to take sufficient countermeasures such as water supply against the spent fuel pool because it takes approximately two month before the top of the spent fuel cans which contain spent fuels are exposed by evaporation of the water.

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