Investigating core axial power distribution with multi-concentration gadolinium in PWR

Jing-Gang Li; Jing-Han Peng; Chao Wang; Jun Chen; Fei Xu; Yun-Fan Ma

doi:10.1007/s41365-022-01121-y

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Investigating core axial power distribution with multi-concentration gadolinium in PWR

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2022-12-16

- Investigating core axial power distribution with multi-concentration gadolinium in PWR
- Nuclear Science and Techniques Vol. 33, Issue 11, Article number: 138(2022)
- Affiliations：
  
  1.China Nuclear Power Technology Research Institute, Shenzhen 518000, China
- Author bio：
  
  * lijinggang@cgnpc.com.cn
- Funds：
- DOI：10.1007/s41365-022-01121-y
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Jing-Gang Li, Jing-Han Peng, Chao Wang, et al. Investigating core axial power distribution with multi-concentration gadolinium in PWR. [J]. Nuclear Science and Techniques 33(11):138(2022)
DOI：

Jing-Gang Li, Jing-Han Peng, Chao Wang, et al. Investigating core axial power distribution with multi-concentration gadolinium in PWR. [J]. Nuclear Science and Techniques 33(11):138(2022) DOI： 10.1007/s41365-022-01121-y.

摘要

Abstract

Core axial power distribution is an essential topic in pressurized water reactor (PWR) reactivity control. Traditional PWRs limit stability against axial core power oscillations at a high-cycle burnup. Because the "camel" peak power shape typically occurs with increasing depletion, the approaches used for the axial power control deserve special attention. This study aims to investigate the performance of different gadolinium rod design schemes in core axial power control during power operation based on the reactivity balance strategy, and to propose new multi-concentration gadolinium rod design schemes. In the new design schemes, low-concentration gadolinium pellets are filled in the axial hump part of the gadolinium rod, and high-concentration gadolinium pellets are filled in the other parts. The impact of different gadolinium rod design schemes on the main core characteristics was evaluated using the nuclear design code package PCM developed by CGN. The results show that the new gadolinium rod design significantly impacts the core axial power shape. The new design schemes can efficiently improve the core axial power distribution along the entire cycle by reducing the core axial power peak at the end of a cycle, enhancing the reactor operation stability, and achieving a better core safety margin, revealing a sizeable potential application.

关键词

Keywords

GadoliniumPCM software packageFuel assemblyCore axial power distributionReactivity

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