MHWRR在极低光激中子水平下的临界启动技术  

The criticality startup techniques for MHWRR under low photoneutron level conditions

作　　者：丁丽[1] 徐鹏程[1] 花晓[1] 甄建霄 葛艳艳[1] DING li;XU Pengcheng;HUA Xiao;ZHEN Jianxiao;GE Yanyan(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核技术》2020年第6期103-108,共6页Nuclear Techniques

摘　　要：阿尔及利亚比林核研究中心重水反应堆(Multi-purposes Heavy Water Research Reactor,MHWRR)实施了仪表、控制和电气数字化升级改造,改造后的首次临界启动对改造工程具有重要意义。为保证反应堆启动安全,需要解决升级改造后在极低光激中子水平下临界启动中存在的核测量盲区问题,首先对长期停堆后堆内剩余光激中子源强、核测量盲区以及临界棒位进行了理论计算与分析研究,在此基础上提出了在无外加启动中子源条件下首次临界启动的实验技术方案。在无参考数据的情况下,实验进程完全按理论设计的预期进行,临界启动一次成功;启动过程中核功率参数得到有效监测,启动测量装置与堆外电离室测量范围衔接完备,临界棒位理论值与实验值的误差小于0.84%,实验结果与理论计算结果符合良好,表明了这项实验技术的合理可行。[Background] The Multi-purposes heavy water research reactor(MHWRR) at the Birine Nuclear Research Center in Algeria had been upgraded. Its instrumentation, control and electrical system had been upgraded and fission molybdenum radiation apparatus were installed in the reactor core. First critical startup at very low photoneutron level after MHWRR upgrade is of great significance to the reactor modernization, marking the completion of the upgrading project. [Purpose] This study aims to fulfill successful critical startup of the reactor without additional neutron source, solve the problem of nuclear measurement blind area, and ensure the startup safety of the MHWRR after long period shutdown. [Methods] Based on the theoretical calculation and analysis of the residual photoneutron source intensity, the nuclear measurement blind area and the critical control rod height, a critical startup experiment scheme was put forward. The experiment was carried out in full accordance with the expectation of theoretical design in the absence of reference data, and nuclear power parameters were effectively monitored. [Results] The measuring data range of startup monitoring devices are well connected with the original monitoring ionization chambers outside the reactor core, and the error between theoretical value of critical control rods position and experimental value is less than 0.84%. [Conclusions] Successful critical startup and the agreement between the experimental results and the theoretical results show that the experiment technique for critical startup of MHWRR is reasonable and feasible.

关 键 词：MHWRR 光激中子 临界启动 

分 类 号：TL374[核科学技术—核技术及应用]