Analysis on radiological consequence in fuel handling accident for advanced small reactor based on ARCON methodology
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摘要: 根据小型供热堆的设计特点，建立了燃料操作事故源项计算模型，研究事故后放射性核素的释放，并基于国外小型堆事故放射性后果分析经验和RG4.28提供的ARCON方法，开展了燃料操作事故后大气弥散因子和场址边界处个人所受剂量的分析。结果表明：燃料操作事故后2 h，燃料包壳间隙的放射性核素释放到环境中，释放到环境的放射性活度达到1014 Bq水平，其中惰性气体的释放量高于碘，133Xe释放量最大；事故后30 d燃料操作事故所致的场址边界处个人有效剂量和甲状腺剂量可满足剂量限值要求，剂量最大值位于东北东方位。Abstract: The accident source term and radiological consequence evaluation of small heating reactor at site boundary is the key content of nuclear and radiation safety review. According to the design characteristics of the advanced small reactor, the accident source term calculation model is established for fuel handling accident to study the release of radionuclides after the accident. Based on the experience of accident radiological consequence analysis of small reactor abroad and ARCON methodology in RG4.28, the atmospheric dispersion factor and individual dose at site boundary in fuel handling accident are analyzed. The results show that two hours after the accident, the radionuclides in the fuel cladding gap release into the environment, and the release amount of radionuclide in the environment reaches the radioactivity level of 1014 Bq. The release amount of inert gas is higher than that of iodine, and that of 133Xe is the largest. The individual effective dose and thyroid dose at the site boundary after 30 days of the fuel handling accident are within the dose limits and the maximum dose occurs at the east-north-east direction. The results of the accident source term and radiological consequence could provide technical support for offsite dose assessment and review of the advanced small reactor.
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Key words:
- advanced small reactor /
- ARCON methodology /
- fuel handling accident /
- accident source term /
- dose
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图 2 燃料操作事故释放到环境中的碘放射性活度
Figure 2. Radioactivity of iodine released to the environment in fuel handling accident
图 3 燃料操作事故释放到环境中的惰性气体放射性活度
Figure 3. Radioactivity of inert gas released to the environment in fuel handling accident
图 4 事故后各方位及全场址大气弥散因子
Figure 4. Atmospheric dispersion factors for all directions and the overall site after the accident
图 5 燃料操作事故所致场址边界处有效剂量
Figure 5. Total effective doses at site boundary in fuel handling accident
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