一回路注锌对“华龙一号”CIPS风险的影响研究

Effect of Primary Zinc Injection on HPR1000 CIPS Risk

压水堆运行期间堆芯沉积的污垢有可能导致反应堆发生垢致轴向功率偏移,国际上诸多压水堆运行经验表明一回路注锌能够降低垢致轴向功率偏移风险。本文研究了一回路注锌对垢致轴向功率偏移影响的深刻原因,并采用中广核自主开发的污垢分析软件CAMPSIS对“华龙一号”机组开展了注锌前后的垢致轴向功率偏移风险评估。计算结果表明,注锌能够减少污垢总量以及硼析出量,进而降低垢致轴向功率偏移风险。研究成果为压水堆实施一回路注锌提供了理论依据和数据支撑。

CRUD(Chalk Rivers Unidentified Deposit) deposited in the core of PWR during operation may cause CIPS(Crud Induced Power Shift).According to global operation experience,injecting zinc into the primary circuit could reduce the risk of CIPS.In this paper,the reasons for the effect of zinc injection on CIPS were studied.The crud analysis software CAMPSIS developed by China General Nuclear Power Group(CGN) was used to evaluate the CIPS of HPR1000 PWR before and after zinc injection.The calculation results show that zinc injection could reduce the total amount of CRUD deposition and boron precipitation in the reactor core,thus reducing the risk of CIPS.The study results provide theoretical basis and data support for PWRs to implement zinc injection.