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Boron behaviour issue during control blade degradation at the beginning phase of postulated scenario for 1F Unit 2 accident reproduced in the CLADS MADE 01 test

Pshenichnikov, A. ; 倉田 正輝; 永江 勇二; 山崎 宰春

Pshenichnikov, A.; Kurata, Masaki; Nagae, Yuji; Yamazaki, Saishun

The problem of control blade degradation which involves boron carbide in the eutectic reaction is one of the key issues for understanding of the accident progression at the beginning phase of the severe accident. In the 1f Unit 2 postulated integral test conditions the interaction of B with the hot steam was found to be rather difficult because of melting and encapsulation of the B materials in the debris. Thus the amount of B release for BWRs in Japan can be significantly lower. The presentation discusses the possibility of unpredictable B accumulation in some unpredictable places in the reactor core.

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