采用FCM燃料的无可溶硼堆芯物理设计

Core Physics Design for the Soluble Boron-Free Reactor Loading the FCM Fuel

小型模块化压水堆(SMPWR)是目前国际上的研究热点之一。如何进一步简化SMPWR系统,并提升其安全性是设计优化的关键。FCM燃料是一种将TRSIO燃料弥散在SiC基体中的燃料,具有很好的裂变产物包容能力,可有效降低SMPWR大规模放射性释放风险。本文采用FCM燃料,设计并优化形成SMPWR的堆芯方案。在此基础上又进一步对控制棒吸收体材料、控制棒布置方案、控制棒移动策略等进行研究分析,最终得到无可溶硼堆芯设计方案,从而简化了SMPWR的化容系统。经计算分析表明,该堆芯设计方案可通过控制棒组实现堆芯反应性的控制,实现无可溶硼运行。本文的研究为FCM燃料在压水堆中的应用以及小堆消除可溶硼的设计优化提供了参考。

The small modular PWR(SMPWR)is one of the hot spots recently.How to simplify the system of SMPWR and improve the security is the key to design optimization.The fully ceramic microencapsulated(FCM)fuel embeds the tristructural isotropic(TRISO)coated particles into the silicon carbide(SiC)matrix.With a good fission product retention,it can effectively reduce the risk of massive radioactive release.This article optimizes the design scheme of the SMPWR core.It analyzes the material of the control rod absorber,the control rod placement scheme,the control rod strategy and finally obtains the soluble boron-free reactor core design scheme,thereby simplifying the chemical and volume control system of SMPWR.The analysis show that the reactivity of the core can be controlled by control rods and the reactor can be operated without the soluble boron with the design scheme.This study provides a valuable reference for application of FCM fuel in PWRs and soluble boron-free optimization for SMPWR.