Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (1): 10602-010602.doi: 10.11889/j.0253-3219.2016.hjs.39.010602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Influence of multigroup nuclear data uncertainties on the reactor core physics calculation

PAN Xinyi, LAN Bing, ZHANG Chunming, JING Jianping, YOU Guoshun   

  1. Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China
  • Received:2015-08-31 Revised:2015-10-23 Online:2016-01-10 Published:2016-01-14
  • Supported by:

    Supported by National Science and Technology Major Project (No.2013ZX06002001)


Background: The uncertainty of nuclear data is one of the key factors resulting in the uncertainty of reactor physics calculation. Purpose: The influence of multigroup nuclear data uncertainties on the reactor core physics calculation was studied in this paper. Methods: The stochastic sampling modular SAMP based on covariance matrix of nuclear data was developed, and the hybrid method and stochastic sampling method were realized using SCALE (Standardized Computer Analyses for Licensing Evaluation) software package. The two methods were validated using 3×3 hypothetical core and then applied to the first cycle of Almaraz pressurized-water reactor (PWR) in the IAEA (International Atomic Energy Agency) fuel management benchmark. Results: Results of the two methods are in good agreement. The uncertainty of core effective multiplication factor is about 0.5%, and the maximum uncertainties of the radial and axial power are about 1.9% and 0.45% respectively in Almaraz PWR. Conclusion: The two-step method and stochastic sampling method can both be used for the uncertainty analysis of reactor core calculation.

Key words: Multigroup nuclear data, Uncertainty, SCALE, Stochastic sampling, Covariance matrix

CLC Number: 

  • TL329