论文部分内容阅读
为了对１座压水型动力反应堆作燃料元件破损的现场监测，计算了一些裂变产物的主要γ光子用７６．２ｍｍ×７６．２ｍｍＮａｌ探测器测量时产生的光电峰相对计数率随反应堆启动不同时间的变化，并作了监测中的干扰因素分析。计算和分析结果表明：在元件安全性监测中，最适合选择的γ光子能量是２２０．９ｋｅＶ（８９Ｋｒ）、４０２．７ｋｅＶ（８７Ｋｒ）、１９６．３ｋｅＶ（８８Ｋｒ）、５２９．８ｋｅＶ（１３３Ｉ）和８１ｋｅＶ（１３３ｘｅ）。在监测中存在的主要干扰因素是高能γ射线产生的湮没辐射、ｗａｌ探测器周围ｐｂ屏蔽上产生的７５ｋｅＶＸ射线及由１９Ｏ和１６Ｎ产生的γ射线。在１座反应堆２次事故排除的元件安全性监测中，分析方法成功地得到了应用。
In order to monitor the damage of fuel element in a pressurized water dynamic reactor, the relative counting rates of the photoelectric peak generated when the main γ-photons of some fission products were measured by the 76.2 mm × 76.2 mmNal detector were calculated with the reactor starting time The changes were analyzed and interferences in the monitoring were analyzed. The results of calculation and analysis show that the most suitable gamma photon energy for component safety monitoring is 220.9 keV (89Kr), 402.7 keV (87Kr), 196.3 keV (88Kr), 529.8 keV (133I) and 81 keV (133xe). The main disturbing factors in the monitoring are the annihilation radiation generated by high-energy gamma rays, the 75 keVX rays generated on the pb shield surrounding the wal detectors and the gamma rays generated by 19O and 16N. The analysis method has been successfully applied in the component safety monitoring of two accidents in one reactor.