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Analysis of ~(58)Co Activity Concentration in the Primary Coolant During CPR1000 NPP Shut Down for Outage

Xiong Jun,Jiang Zhenyu,Tang Shaohua(China Nuclear Power Design Co.Ltd.,Guangdong Shenzhen 518045)  
Activated corrosion products which deposit on inner walls of primary coolant are the main radioactive sources in PWR NPPs during outage.A method for estimating the 58 Co activity concentration during outage was proposed in this paper,By analysis,we can get that the purification rate and the release rate in the primary coolant are the main factors to changes of the 58 Co activity concentration,and the 58 Co activity concentration meet the related requirement of Outage limits in CPR1000 nuclear power plant.
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