Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (10): 100602-100602.doi: 10.11889/j.0253-3219.2019.hjs.42.100602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Theoretical research on location of fuel assemblies failure using the activity ratio of134Cs and 137Cs

Lin ZHU1,Guanglei LIU1(),Jingjing LIU2   

  1. 1. State Nuclear Power Demonstration Plant Co. Ltd. , Weihai 264300, China
    2. Liao Ning Hong Yan He Nuclear Power Co. Ltd. , Dalian 116000, China
  • Received:2019-06-17 Revised:2019-09-16 Online:2019-10-13 Published:2019-10-16
  • Contact: Guanglei LIU
  • About author:ZHU Lin, female, born in 1990, graduated from Harbin Engineering University with a master’s degree in 2017, focusing on fuel management in nuclear power plant

Abstract: Background

It is very important to locate ruptured fuel assemblies rapidly and accurately not only for emergency core refueling, but also for shortening critical path of overhaul.


This study aims at location of fuel assemblies failure using the activity ratio of 134Cs and 137Cs.


The relationship between the ratio of 134Cs to 137Cs activity and fuel consumption in the fuel assembly was theoretically calculated, and the theoretical model was modified by ORIGEN software.

Results & Conclusions

It is found that the activity ratio of 134Cs to 137Cs increases with the increase of the burn-up, and decreases with the increase of fuel assembly enrichment. With the improved 134Cs to 137Cs activity ratio and burnup model, the burnup of damaged fuel assemblies at different enrichment levels in pressurized water reactor (PWR) nuclear power plants can be determined, and then the damaged fuel assemblies can be quickly located.

Key words: Burn-up, 134Cs, 137Cs, Fuel assembly

CLC Number: 

  • TL352.2+7