巴基斯坦微型堆启动与参数测定

STARTUP AND PARAMETER MEASUREMENTS FOR PAKISTAN MNSR (PARR-Ⅱ)

文章叙述了本院为巴基斯坦核科学技术研究所建造的微型堆(PARR-Ⅱ)的启动、调试与参数测量工作的主要结果。该堆于1989年11月2日达到临界,初始冷态的后备反应性为4mk,一周后提升功率,内辐照座中子通量密度达到额定值1×10^(12)n/cm^2·s,在1.1×10^(12)n/cm^2·s通量密度水平最大可连续运行时间为6.75h。通过释放4mk反应性实验,在内辐照座测量得到中子通量密度达最大值时为额定通量密度的2.9倍。测试结果表明,该堆具有良好的固有安全性,各项技术指标均达到了预期值,并于1989年11月下旬正式投入营运。

The paper presents the main results of the startup and the preparation experi-ment for PARR-II. This reactor safely Went to critical on November 2nd 1989,and reached its rated flux level of 1×10^(12)n/cm^2.s on November 10th 1989. Maxi-mum operating time under the condition when the neutron flux at inner irradiationsite is 1.1×10^(12)n/cm^2.s is 6.75 hours. For the test of sudden reactivity release,the control rod was fully withdrawn i.e. 4mk of excess reactivity was released,about six minutes later the peak flux reached to 2.9×10^(12)n/cm.s. The results showthat the PARR-II possesses an inherent safety, various parameters met those stipu-lated in the contract. This reactor was formally put into use on November 14 th1989.