船用堆全船断电事故源项分析

摘要

Based on the integration program of MELCOR for severe accident analysis , the computational model of a typical marine reactor was established .The creep failure of pressurizer surge tube in the accident of blackout was verified ,and the behavior of the source term before and after the break of surge tube was analyzed .The results show that atmospheric environment and crew would suffer the radioactive harm .The smaller the surge tube break ,the slower the accident process .However ,the external radiation of the crew is slightly increased and the internal radiation is unchanged .The research results can provide a basis on further dose analysis of the source term and the emergency action inside and outside the ship .%本文以一体化严重事故分析程序M ELCOR为研究工具，建立了某型船用堆的计算模型。计算验证了全船断电事故稳压器波动管的蠕变失效，对波动管破损前后的源项行为进行了分析研究。结果表明：波动管失效直接导致对大气环境和船内人员的放射性危害。波动管破损尺寸的减小，导致失效后事故进程减慢，然而对船内人员的外照射危害略有提高，内照射危害相同。本文研究结果可为进一步的源项剂量分析及船内外应急提供依据。