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Research on Neutronics Safety Parameters of the AP1000 Nuclear Reactor under Different Conditions

Authors :
Xinyi Niu
Jianquan Liu
Zenghao Dong
Jie Wei
Wenlong Zhou
Source :
Energies, Vol 16, Iss 22, p 7549 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

Changes in temperature during reactor operation may cause changes in physical parameters, leading to core overheating and accidents. It is essential to analyze and assess the safety parameters of the core under different operating conditions. This paper investigates the effects of fuel temperature, moderator density, boron concentration, and control rod state on AP1000 safety parameters. The study uses RMC and NJOY to calculate the changes in reactivity factor, effective delayed neutron fraction, and neutron generation time of the AP1000 reactor under different operating conditions. The changes in reactivity coefficients, neutron fluxes, and relative power densities of AP1000 reactors are analyzed for normal and accidental operating conditions. The results indicated that the reactivity coefficient remained negative under accident conditions, which ensured the safe operation of the reactor. The delayed neutron fraction, neutron flux, and power density distributions are affected by fuel temperature, moderator density, and control rod position. The control rod worth was sufficient for the emergency shutdown of the reactor under accidental conditions. It is demonstrated that the operation of the AP1000 reactor under study conditions is safe and controllable.

Details

Language :
English
ISSN :
16227549 and 19961073
Volume :
16
Issue :
22
Database :
Directory of Open Access Journals
Journal :
Energies
Publication Type :
Academic Journal
Accession number :
edsdoj.63cad9ef858647f6bffe0ee992968be7
Document Type :
article
Full Text :
https://doi.org/10.3390/en16227549