# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (2): 24

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

### Preliminary analysis of reactivity reconstruction capability based on inverse kinetics method under different initial reactivity states

Xiao-Xiang Zhang 1,2, Guang-Yao Sun 1, Jun Gao 1, Jing Song 1, Qi Yang1

1. 1 Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China
2 University of Science and Technology of China, Hefei 230027, China
• Contact: Qi Yang E-mail:qi.yang@fds.org.cn
• Supported by:

This work was supported by the Strategic Priority Science and Technology Program of the Chinese Academy of Sciences (No. XDA03040000), the National Natural Science Foundation of China (NSFC) (Nos. 11305205, 11305203, and 11405204), the Special Program for Informatization of the Chinese Academy of Sciences (No. XXH12504-1-09), the Anhui Provincial Special project for High Technology Industry, and the Special Project of Youth Innovation Promotion Association of Chinese Academy of Sciences, the Industrialization Fund.

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Xiao-Xiang Zhang, Guang-Yao Sun, Jun Gao, Jing Song, Qi Yang. Preliminary analysis of reactivity reconstruction capability based on inverse kinetics method under different initial reactivity states.Nuclear Science and Techniques, 2018, 29(2): 24
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Abstract:

Online reactivity monitoring plays an important role in operation and safety analyses of fission reactor systems. The inverse kinetics method, which is based on a point kinetics model, is the most widely used method for reactivity reconstruction of critical water reactors. However, this method is seldom applied to the reactivity reconstruction of subcritical reactors. In this study, an inverse kinetics method was employed for the reactivity reconstruction of a lead-based reactor under different initial reactivity states (ρ0 = 0, - 2786, - 5486, - 8367, and - 12,371 pcm). The results showed that the deviation in the reactivity of the lead-based subcritical reactor was greater when ρ0 became smaller. The reactivity reconstructed using the inverse kinetics method was globally underestimated. At a given reactivity perturbation, the relative and absolute errors increased with the decrease in the initial reactivity. At a given initial reactivity, with the increase in the reactivity perturbation, the absolute error increased, whereas the relative error remained the same. This deviation is due to the variation in the external neutron source, spatial-spectral effects, and sub-diffusive effects, which require further study.