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Design study on measures to prevent loss of decay heat removal in a next generation sodium-cooled fast reactor

次世代ナトリウム冷却炉における除熱喪失事象防止対策についての設計検討

近澤 佳隆; 久保 重信; 島川 佳郎*; 金子 文彰*; 庄司 崇*; 中田 崇平*

Chikazawa, Yoshitaka; Kubo, Shigenobu; Shimakawa, Yoshio*; Kaneko, Fumiaki*; Shoji, Takashi*; Nakata, Shuhei*

次世代ナトリウム冷却高速炉において第4世代原子炉に求められる安全要求を満たす除熱系喪失対策の検討を行った。設計基準の完全自然循環の崩壊熱除去系3系統に加え、独立した代替冷却設備の具体化を行った。

Sodium-cooled reactor (SFR) has superior characteristics thanks to sodium coolant features such as low pressure and high natural convection capability. Involving lessons learned from the 1F accident, requirements on design base DHRS have been modified. In that modification, safety requirements on design extended conditions have been clarified and sodium temperature criteria have been changed taking into account design margin even for design extended conditions. With the new DHRS configuration including ACS, designs of component cooling water system and emergency power supply have been updated.

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