Super homogenization method applied in diffusion calculation for pebble-bed fluoride-salt-cooled high-temperature reac

Ming DAI; Guifeng ZHU; Ye DAI; Yang ZOU; Xiaohan YU

doi:10.11889/j.0253-3219.2017.hjs.40.090604

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Super homogenization method applied in diffusion calculation for pebble-bed fluoride-salt-cooled high-temperature reac

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Super homogenization method applied in diffusion calculation for pebble-bed fluoride-salt-cooled high-temperature reac
- NUCLEAR TECHNIQUES Vol. 40, Issue 9, Article number: 090604(2017)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院核辐射与核能技术重点实验室上海 201800
  3.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
  
  Strategic Priority Research Program of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2017.hjs.40.090604
  CLC： TL329
- Received：14 March 2017，
  
  Revised：27 May 2017，
  
  Published：2017-09
- 稿件说明：
移动端阅览
Ming DAI, Guifeng ZHU, Ye DAI, et al. Super homogenization method applied in diffusion calculation for pebble-bed fluoride-salt-cooled high-temperature reac[J]. Nuclear techniques, 2017, 40(9): 090604
DOI：

Ming DAI, Guifeng ZHU, Ye DAI, et al. Super homogenization method applied in diffusion calculation for pebble-bed fluoride-salt-cooled high-temperature reac[J]. Nuclear techniques, 2017, 40(9): 090604 DOI： 10.11889/j.0253-3219.2017.hjs.40.090604.

摘要

球床氟盐冷却高温堆的控制棒位于侧反应射层内，存在无裂变中子源且受堆芯泄漏谱强烈影响的强吸收体区域扩散计算难题。超级均匀化方法（Super Homogenization，SPH）被用于对氟盐球冷却床堆侧反射层中控制棒区域的强吸收体进行等效均匀化处理，同时堆芯除控制棒区域外采用谱修正方法（Spectra Modification，SM），将输运计算的结果作为基准进行验算。结果表明，SM-SPH模型能有效地计算球床氟盐冷却高温堆反射层控制棒价值及通量分布，并且较常规的SPH方法能更好地处理棒间干涉效应。

Abstract

Background:

The control rods of pebble-bed fluoride-salt-cooled high-temperature reactor (PB-FHR) are located in the side reflector. Neutron diffusion calculation in those control rods has difficulties of no fission source in the control rod region and strong effect from the core leakage spectrum.

Purpose:

This study aims to apply super homogenization (SPH) method in diffusion calculation for PB-FHR.

Methods:

SPH method is applied in the diffusion calculation for the strong absorber in control rod region located in the reflector area of the PB-FHR

through which the local area of control region is homogenized. The spectra of different places of the reactor core except the control rod region are calculated to modify its cross sections. SPH factors calculation is accomplished by an iteration procedure between SPH and spectra modification (SM).

Results:

Reactivity worth of the control rod and neutron flux distribution are calculated accurately.

Conclusion:

Compared with the fine mesh transport reference solution

the verification results demonstrates that the method proposed can accurately model the control rod including the reactivity worth and flux distribution

and it is more suitable for the situation with interference effect between different control rods compared with regular SPH method.

关键词

Keywords

references

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