Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2007, Vol. 18 ›› Issue (3): 181 doi: 10.1016/S1001-8042(07)60043-8

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Hydrogen and steam distribution following a small-break LOCA in large dry containment

DENG Jian* CAO Xuewu   

  1. School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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DENG Jian CAO Xuewu. Hydrogen and steam distribution following a small-break LOCA in large dry containment.Nuclear Science and Techniques, 2007, 18(3): 181     doi: 10.1016/S1001-8042(07)60043-8

Abstract: The hydrogen deflagration is one of the major risk contributors to threaten the integrity of the containment in a nuclear power plant, and hydrogen control in the case of severe accidents is required by nuclear regulations. Based on the large dry containment model developed with the integral severe-accident analysis tool, a small-break loss-of-coolant-accident (LOCA) without HPI, LPI, AFW and containment sprays, leading to the core degradation and large hydrogen generation, is calculated. Hydrogen and steam distribution in containment compartments is investigated. The analysis results show that significant hydrogen deflagration risk exits in the reactor coolant pump (RCP) compartment and the cavity during the early period, if no actions are taken to mitigate the effects of hydrogen accumulation.

Key words: Severe accident, Small-break LOCA, Large dry containment, Hydrogen distribution