压水堆核电站一回路~(16)N源项计算模型的优化

~(16)N是压水堆一回路冷却剂中的主要活化产物,也是一回路中的主要辐射源。本文在传统~(16)N源项计算模型的基础上,根据堆芯内冷却剂的流向,考虑堆芯区域以及下降段区域的中子通量差异,将堆芯划分为活化区域以及反射区域,并建立了相应的计算模型,以典型三代压水堆核电站为例进行了计算与验证,计算结果与技术文件吻合良好,偏差在10%以内,验证了模型的正确性。最后分析了一回路典型部位的~(16)N平衡放射性活度浓度,发现在反应堆堆芯出口处最高,随着冷却剂流向逐步减少。研究结果表明,优化的计算模型可更准确计算压水堆核电站冷却剂的~(16)N源项,为分析反应堆一回路的辐射源项提供参考依据。

Optimized Calculation Model of 16 N radiation sources in main coolant of PWR

As the coolant to pass through each activation region in reactor vessel,the neutron in the region will activate the Oxygen in water into activation product,such as16 N.16 N is the main product,and it is the most important radiation sources in primary side. A 16 N radiation sources model based on conventional method,and primary coolant flow direction,divided core area to activation regions and reflection regions. To proved the validity of calculating model,the integrative calculation of 16 N radiation sources in main coolant was completed. Analyzed the coolant typical 16 N model to equilibrium radiation sources,discover the radiation sources in the reactor was the max,reduced along with the coolant. Study result indicated, optimized calculation model more accurate calculation on the 16 N source,.