Design and Analysis of Prevention and Mitigation Measures against Core Melting under High Pressure in RCS for CHASHMA NPP Unit 2
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摘要: 恰希玛核电厂2号机组在稳压器上增设一个电动节流阀,用于在"充水-排汽"冷却中实施排汽,以及严重事故高压熔堆下快速降压。本文采用SCDAP/RELAP5/MOD3.1程序分析了全厂断电叠加2个系列柴油机辅助给水系统失效事故,结果表明,增设的稳压器电动节流阀能有效地实施严重事故下快速降压,缓解事故后果。Abstract: A motor operated valve（MOV） is added on the Pressurizer for CHASHMA NPP Unit 2,to implement the bleed function in Feed-Bleed cooling mode,and depressurize rapidly the RCS during high pressure core melt in severe accident.This paper analyzes the accident consequence of Station Blackout co-incident with the loss of Diesel Driven Feedwater Pumps using the computer code of SCDAP/RELAP5/MOD 3.1,and the analysis results justify that the added MOV is able to depressurize the RCS effectively to mitigate the accident consequence in severe accident.
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Key words:
- Core melting under high pressure /
- Mitigation measure /
- Rapid depressurization /
- MOV
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