加速器驱动的10MW次临界反应堆物理方案研究

Physical Scheme Study of 10 MW Accelerator Driven Sub-critical Reactor

加速器驱动的次临界系统(ADS)是未来最有可能实现工业化嬗变核废料的装置。通过设计1个10MW的ADS物理方案,研究ADS的嬗变能力。采用MCNPX和ORIGEN的耦合程序,利用基于ENDF6.8处理所得的6个温度(300、600、900、1 200、1 500、1 800K)下连续能量核数据库,计算得到ADS随燃耗时间变化的有效增殖因数keff、功率峰因子和质子束流强度。同时通过计算给出了该设计方案下ADS燃料多普勒系数、冷却剂空泡系数和有效缓发中子份额,利用这些物理量研究了该ADS方案的安全特性,并通过燃耗计算研究了ADS的嬗变能力。结果表明,在1 000d燃耗时长内,keff和质子流强随时间的波动较小,燃料燃耗深度较浅,系统可提升功率运行,在假想事故下系统能保持次临界状态。系统嬗变支持比约为8。

The accelerator-driven sub-critical system（ADS） is recognized as the most wonderful installation to transmute nuclear wastes in future industry.A physical design of 10 MW ADS was studied.The physical design was established by using the method of combination of MCNPX and ORIGEN code systems based on the nuclear data library of ENDF6.8,which was modified with six different temperatures（300,600,900,1 200,1 500,and 1 800 K）.The results of keff,power peak factor and proton current density varying with burnup time were given from the calculations.The βeff,fuel Doppler and coolant void coefficients were got from the calculation results,and ADS safety features were analyzed.Moreover,transmutation capability of ADS was studied by using the results of the burnup calculation.The results show that during the 1 000 d burnup,the swing of keff and proton current density is relatively smaller.The burnup of the fuel is relatively shallow.The system remains sub-critical when hypothetical accident happens.The transmutation support rate of the system is about 8.