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事故后的堆芯损伤评价方法是核电厂应急计划的内容之一,它用以评价核电厂在经受一次事故后堆芯实际损伤的状态和程度。堆芯损伤状态包括堆芯无损伤、燃料元件包壳破损、燃料过热和燃料熔化等四种。方法包括基于在线监测系统的初步评价和基于取样系统的详细评价。它对西屋公司于1984年开发的“事故后的堆芯损伤评价方法学”作了若干改进和发展。例如在损伤份额的计算中引入了与燃耗有关的修正以及利用严重事故源项研究成果进行了裂变产物在一回路上的滞留修正等。评价方法及相应的计算机程序已用于秦山核电厂,也可以用于其他压水堆型核电站。
The core damage assessment method after an accident is one of the components of a nuclear power plant emergency plan, which is used to evaluate the status and degree of actual damage of a nuclear power plant after being subjected to an accident. Core damage state includes core damage, fuel cladding damage, fuel overheating and fuel melting four. The method includes a preliminary evaluation based on the online monitoring system and a detailed evaluation based on the sampling system. It made a number of improvements and developments to Westinghouse’s Methodology for Assessing Post-Incident Core Damage Assessment, which was developed in 1984. For example, in the calculation of the share of damage, fuel-related amendments were introduced and the results of research on serious accident source items were used to carry out the revision of retention of fission products on the primary circuit. The evaluation method and the corresponding computer program have been applied to Qinshan Nuclear Power Plant and other pressurized water reactor nuclear power plants.