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MCNP5在固态燃料熔盐堆功率分布计算的应用
Application of MCNP5 in power distribution calculations of solid fuel molten salt reactor
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摘要: 采用蒙特卡罗输运程序MCNP5对固态燃料熔盐实验堆(TMSR-SF1)能量沉积比例及功率分布进行了计算分析.针对MCNP5不能处理缓发β及缓发γ的能量沉积问题进行了类比等效处理.对固态燃料熔盐实验堆在寿期初、寿期中、寿期末相应的能量沉积比例及功率分布进行了研究.通过计算发现,固态燃料熔盐实验堆内燃料球相比于压水堆棒状燃料元件(95％～97％左右)而言,能量沉积比例有所偏小,约为93％.同时,由于堆芯功率分布均匀,功率峰因子较小(约1.5),堆芯安全性较好.Abstract: A Monte Carlo Code MCNP5 is used to analyse the energy deposition ratio and power distribution in thoriumbased molten salt experiment reactor with solid fuel (TMSR-SF1).Since MCNP5 could not deal with the deposition energy from delayed beta and gamma ray photons,an analog equivalent method is used to take them into account.Then,the energy deposition rate and power distribution in TMSR-SF1 are calculated during the beginning,the middle and the end of the reactor life cycle.The results indicate that,compared with the PWR fuel rod (which is about 95 ％-97％),the energy deposition ratio in the pebble of TMSR-SF1 is smaller (about 93 ％).At the same time,TMSR-SF1 behaves good safety feature due to its low power peak factor (about 1.5).
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