利用福岛第一核电厂事故期间环境监测资料反推事故释放源项

2011年3月11日,日本福岛核事故导致放射性物质向大气环境的大规模释放。本工作利用大气数值预报模式WRFV2.2.1和大气弥散模式CALPUFF,对事故期间放射性物质的大气输运和弥散进行了模拟。应用大气释放源项的逆推算方法,结合单位释放率条件下的大气弥散模拟结果和环境监测数据,对福岛第一核电厂1到3号机组向大气环境释放的放射性核素总量进行了评估,推算的131I和137 Cs气载释放量分别为8.6×1016 Bq和8.6×1015 Bq。

Reverse Estimation of Accidental Release Amounts From Fukushima Daiichi Nuclear Power Plant by Environmental Monitoring Data

The Fukushima Daiichi nuclear power plant accident on March 11,2011 caused the month-long discharge of radioactive materials into the atmosphere.By using numerical prediction model WRFV2.2.1 and dispersion model CALPUFF,atmospheric transport and dispersion of radioactive materials was simulated during the accident.The method of a reverse estimation of source term into environment was applied by combining environmental monitoring data with atmospheric dispersion simulations under the assumption of unit release rate.Preliminary estimation of release amounts of 131I and 137Cs accidentally discharged from Unit 1 through Unit 3 of the Fukushima Daiichi nuclear power plant into the atmosphere was obtained,based on the environmental monitoring data.Release amounts of 131I and 137Cs are 8.6×1016 Bq and 8.6×1015 Bq,respectively.