Analysis of Effect of Decay on Release Characteristics of Fission Product and Off-Site Dose Assessment
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摘要: 介绍了某三代核电厂严重事故释放类别,选取会造成大量放射性释放的释放类别和对应的典型严重事故序列,采用MAAP程序计算分析裂变产物向环境释放特性。在此基础上,选取对人员剂量贡献最大的几种核素,计算考虑衰变和不考虑衰变2种情况下,各核素向环境累积释放活度及场址边界500 m处的全身剂量和甲状腺剂量的大小,并分析了衰变对累积释放活度和剂量评价的影响。结果表明:衰变对裂变产物向环境累积释放活度的影响与核素半衰期及事故后开始向环境释放时间有关;半衰期越短,裂变产物开始向环境释放时间越晚,衰变的影响越明显;从场外剂量分析,衰变对全身剂量的影响较甲状腺剂量的影响更明显。Abstract: Severe accident release categories of a nuclear power plant of third generation were introduced. The release characteristics to the environment were calculated using MAAP code for those release categories and its severe accident sequences which can result in the large release of radioactive materials. On this base, several nuclides which contribute the most personnel dose were selected. This paper calculated the cumulative activity released to the environment and whole body and thyroid dose of 500 m site boundary with and without considering the decay of nuclides. The effect of decay on the results was analyzed. All these analysis can provide some reference for the improvement of severe accident simulation program. The effect of decay on the cumulative activity of fission products released to the environment is related to the radionuclide half-life and the release time of the fission products after the accidents. From the off-site dose analysis, the effect of decay on whole body dose is more obvious than that on the thyroid dose.
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