Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (6): 60604-060604.doi: 10.11889/j.0253-3219.2017.hjs.40.060604


Calculation method of neutron response of vanadium self-powered detectors

BI Guangwen, TANG Chuntao, YANG Bo   

  1. Shanghai Nuclear Engineering Research & Design Institute, Shanghai 200233, China
  • Received:2017-01-10 Revised:2017-02-27 Online:2017-06-10 Published:2017-06-06
  • About author:10.11889/j.0253-3219.2017.hjs.40.060604

Abstract: Background: Vanadium self-powered detectors (SPDs) are widely used as in-core fixed detectors in nuclear power plants, to continuously provide measurement data for in-core neutron flux map monitoring. Purpose: This study aims at the calculation method of neutron response current for vanadium SPDs, providing a theoretical basis for on-line in-core power distribution monitoring and detector design optimization. Methods:First of all, the response mechanism and characteristics of vanadium SPDs are described, then the neutron response current control equation and calculation method of electron escape probability, based on Warren's analytical model, are presented. Finally, the numerical modeling for the typical vanadium detector specifications is performed and compared with the experimental data. Results: The results show that the deviation of thermal neutron sensitivity per unit length is within ±5% between the computation data and the measured value. Conclusion: It demonstrates the validity and accuracy of the method.

Key words: Vanadium SPDs, In-core neutron flux map monitoring, Detector response current, Electron escape probability, Neutron sensitivity

CLC Number: 

  • TL329