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板型先进高温堆(Advanced high-temperature reactor,AHTR)的设计概念是由美国橡树岭国家实验室提出并发展的,由于其初始剩余反应性较高,除控制棒外,还考虑采用可燃毒物来补偿剩余反应性。本文通过比较6种候选可燃毒物在燃耗后期的毒物残留特性,从中选取了B4C、Gd2O3、CdO和Er2O3四种球形可燃毒物,采用MCNP与Origen2的耦合程序对其尺寸和装载量进行优化计算。结果表明,可燃毒物Er2O3性能最佳,当每块燃料板装载176 g颗粒半径为740μm的Er2O3时,剩余反应性大约从39 000 pcm降到4 400 pcm,燃耗深度只降低约3%。
The concept of a plate-type Advanced High-Temperature Reactor (AHTR) was proposed and developed by the Oak Ridge National Laboratory in the United States. Due to its high initial residual reactivity, combustible toxins Compensate for remaining reactivity. In this paper, four kinds of spherical flammable toxins, B4C, Gd2O3, CdO and Er2O3, were selected from the residue burnout characteristics of six candidate flammable toxins. The size and loading of the flammable toxins were optimized by the coupled procedure of MCNP and Origen2. The results show that Er2O3, a flammable poison, has the best performance. When each fuel plate is loaded with 176 g of Er2O3 with a grain radius of 740 μm, the residual reactivity decreases from 39 000 pcm to 4 400 pcm and the burnup depth decreases by only about 3%.