A kinetic model for the direct response matrix method. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Mitsuyasu, Takeshi; Yamamoto, Akio
• Is Part Of: Journal of nuclear science and technology. Volume 57:Issue 1(2020)
• Page Start: 90
• Page End: 99
• Publication Date: 2020-01-02
• Subjects: Reactor kinetics -- BWR -- transport -- response matrix -- direct response matrix -- SPERT-I; Nuclear engineering -- Periodicals; Nuclear physics -- Periodicals; Nuclear energy -- Periodicals; 621.4805
• DOI: 10.1080/00223131.2019.1659874
• Languages: English
• ISSNs: 0022-3131

Abstract

ABSTRACT: An accurate analysis model for transient reactor behavior is necessary to keep sufficient safety margins of nuclear power plants to prevent cliff edge effects. In this study, the direct response matrix (DRM) method is applied to the kinetic domain and the transient analysis is enabled based on the transport equation. The kinetic DRM model introduces the time delay to four sub-response matrices. The time delay can be evaluated by a Monte Carlo calculation. The model is evaluated in homogeneous and heterogeneous problems. The Doppler feedback is considered in the heterogeneous problem and the calculation results are compared with the experimental data. The calculation results indicate that the calculation step 1.0E-7 s is sufficient for the model and the model provides results in good agreement with the experimental data. It is concluded that the present model with the DRM method can be used for transient analysis.