一引言无论反应堆是计划内停堆,或是事故工况下的紧急停堆,正确估算停堆后裂变产物的衰变热,对冷却剂丧失事故的安全分析、热量导出系统的合理设计、燃烧过的燃料组件的运输和冷却,以及对全面掌握实验快堆的特性,都有重要的参考价值。计算停堆后的衰变热,一般有两种途径。一种是用停堆后的衰变热积分实验曲线,进行指数多项式符合,然后用符合公式进行计算,这种方法有一定的局限性。另一种是累计法,此法单独处理堆中数百种裂变产物中的每一种裂变产物的衰变热,然后相加求得反应堆总的衰变热。累计法计算的正确性主要依赖于裂变产物数据的正确性,这些数据包括裂变产物产额、半寿命、分支比、衰变方式、发射β I. INTRODUCTION Whether the reactor is a planned shutdown or an emergency shutdown under an accident condition, the decay heat of the fission product after shutdown is correctly estimated, the safety analysis of the coolant loss accident, the rational design of the heat removal system, and the combustion Fuel assembly transportation and cooling, as well as a comprehensive grasp of the characteristics of experimental fast reactor, have an important reference value. Calculating the decay heat after the shutdown, there are generally two ways. One is to use decay heat integration test curve after shutdown, exponential polynomial agreement, and then calculated in line with the formula, this method has some limitations. The other is the cumulative method, which treats the decay heat of each of the hundreds of fission products in the stack separately and then adds up to determine the total decay heat of the reactor. The accuracy of the cumulative method relies mainly on the correctness of fission product data, including fission product yield, half-life, branching ratio, decay patterns, emission β