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钍燃料的利用对于缓解核燃料资源短缺具有重要意义,坎杜型反应堆(Canadian Deuterium Uranium,CANDU)在堆芯布置、中子利用效率及先进燃料循环方面具有较高的灵活性,使得其在CANDU反应堆中引入钍燃料循环更具现实意义。CANDU型反应堆中钍基燃料应用关键基础技术研究是加拿大与我国正在开展的合作课题,其中开发自主的CANDU堆堆芯热工水力设计和安全分析程序是钍基燃料应用必不可少的设计工作之一。本文针对CANDU型反应堆热传输系统结构特点,采用FORTRAN程序设计语言开发了适用于CANDU型反应堆热传输系统的热工水力瞬态分析程序CANTHAC(CANDU Thermal-Hydraulic Analysis Code)。利用CANTHAC对钍基先进CANDU堆(Thorium-based Advanced CANDU Reactor,TACR)进行了瞬态分析,计算工况包括满功率稳态、无保护蒸汽发生器(Steam Generator,SG)二次侧给水温度降低事故及完全失流事故。其中,满功率稳态计算结果与清华大学设计的钍基先进CANDU堆TACR设计值吻合较好,相对误差不超过2%,在可接受范围内;无保护SG二次侧给水温度降低事故及完全失流事故在计算条件下所得的燃料温度及系统压力等关键热工水力参数均在安全限值内,满足安全准则要求。程序为模块化编程,便于移植和改进,具有一定的通用性,为进一步研究工作奠定了基础。
The use of thorium fuel is of great importance for alleviating the shortage of nuclear fuel resources. The Canadian Deuterium Uranium (CANDU) has high flexibility in core layout, neutron utilization efficiency and advanced fuel cycle, The introduction of thorium fuel cycle more practical significance. The study of key fundamental technologies for thorium-based fuels in CANDU-type reactors is a subject of ongoing cooperation between Canada and China, in which the development of an autonomous CANDU reactor core thermal hydraulic design and safety analysis program is an essential design task for thorium-based fuel applications one. In this paper, according to the structural characteristics of the CANDU reactor heat transfer system, a thermal-hydraulic transient analysis program CANTHAC (CANDU Thermal-Hydraulic Analysis Code) for CANDU reactor heat transfer system was developed by using FORTRAN programming language. The Thorium-based Advanced CANDU Reactor (TACR) was transiently analyzed using CANTHAC. The calculation conditions include full power steady state, and the secondary side of the unprotected steam generator (Steam Generator, SG) Accident and complete loss of life accident. Among them, the full-power steady-state calculation results are in good agreement with the TACR design of thorium-based advanced CANDU reactor designed by Tsinghua University, and the relative error is less than 2%, which is within the acceptable range. The key thermal and hydraulic parameters such as fuel temperature and system pressure obtained under the condition of calculation for loss of flow are within the safety limits to meet the safety standards. Program for the modular programming, easy to transplant and improve, has a certain versatility, laid the foundation for further research.