【摘要】 本文将地震作为初因事件,以严重事故中极少发生的全部燃料元件破损作为西安脉冲堆(XAPR)的包络性事故,使用ORIGEN2软件计算了XAPR燃耗末期气态裂变产物的放射性活度,并以保守的释放模型计算释放源项;采用STOERNEU软件计算分析了该事故下的场外放射性后果。结果表明,在极端的全部燃料元件破损事故下,在事故发生后0～8h时段释放的最大总放射性源项为4.50×1012Bq,场区100m边界处的公众最大个人有效剂量为5.47mSv,公众最大个人甲状腺当量剂量为129.74mSv,远低于国家标准(GB6249)中规定的重大事故剂量参考水平,略低于需要在场外采取隐蔽措施的通用干预水平。本文结果可以作为安全分析报告中后果分析的补充。更多还原

【Abstract】 As earthquake was selected as initiating event, all fuel elements cladding rupture accident was considered as extreme and enveloping case for Xi’an Pulse Reactor (XAPR). In the case, inventory of gaseous fission products was calculated with ORIGEN2 software in spent fuel and source term was calculated with conservative release model. Radiological consequence evaluation was performed with the use of STOERNEU software. The result demonstrated that the most source term was up to 4.50×1012 Bq released at 0-8 h period. The result also demonstrated that maximum individual effective doses for members of the public at 100 m boundary from reactor site were 5.47 mSv and maximum individual thyroid doses were 129.74 mSv. These doses were far less than dose criteria of momentous accident in GB 6249, and were less than generic intervention level of sheltering in general emergency. This result could be supplementation to radiological consequence analysis in safety analysis report.更多还原