The temperature distribution of molten salt reactor under the outer salt layer blocked situation

Long HE; Chenggang YU; Wei GUO; Ye DAI; Jiajie SHEN; Hailing WANG; Xiangzhou CAI

doi:10.11889/j.0253-3219.2018.hjs.41.050601

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The temperature distribution of molten salt reactor under the outer salt layer blocked situation

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

- The temperature distribution of molten salt reactor under the outer salt layer blocked situation
  封面论文
- NUCLEAR TECHNIQUES Vol. 41, Issue 5, Article number: 050601(2018)
- 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.中国科学院先进核能创新研究院上海 201800
  3.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.050601
  CLC： TL333
- Received：27 December 2017，
  
  Revised：24 January 2018，
  
  Published：10 May 2018
- 稿件说明：
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Long HE, Chenggang YU, Wei GUO, et al. The temperature distribution of molten salt reactor under the outer salt layer blocked situation[J]. Nuclear techniques, 2018, 41(5): 050601
DOI：

Long HE, Chenggang YU, Wei GUO, et al. The temperature distribution of molten salt reactor under the outer salt layer blocked situation[J]. Nuclear techniques, 2018, 41(5): 050601 DOI： 10.11889/j.0253-3219.2018.hjs.41.050601.

摘要

出于冷却结构材料上的考虑，石墨慢化通道型熔盐堆通常在石墨反射层与反应堆容器间设置了外围熔盐层。针对2 MW液态燃料熔盐堆的概念设计，利用三维稳态热工水力学模型分析了外围熔盐层在不同堵塞情况下对反射层和合金温升造成的影响。熔盐堆内石墨慢化材料等固体区域的温度计算采用三维热传导模型，各个通道内熔盐采用一维单相流体模型描述。外围熔盐层在不同堵塞情况下分别采用一维单相流体模型和三维层流模型。计算结果表明：在外围熔盐层内总流量降低的堵塞情况下，外围熔盐层对反射层的冷却效果受到显著影响，在外围熔盐层的流量降低至堆芯额定流量0.365%时，反应堆容器的最高温度接近730℃，临近合金材料温度上的安全限值；当外围熔盐层内存在直径为4 cm的圆形局部堵塞（接近下熔盐通道半径）区域时，堵塞没有显著改变堆内的温度分布，堵塞区域的最高温度为621.74℃，未超过合金材料的安全限值。

Abstract

Background

For the graphite-moderated channel type molten salt reactor

the outer salt layer is typically adopted to cool the graphite moderator and the reactor vessel. Since the outer salt layer is adjacent to the alloy

the safety of the structure material is directly influenced by the cooling effect of the outer salt layer.

Purpose

This study aims at researching the influence of the outer salt layer under blocked situation on the temperature distribution of reflector and alloy for a conceptual designed 2 MW experimental molten salt reactor.

Methods

First of all

a three-dimensional thermal-hydraulic model is built to analyze the temperature distribution of the solid region using the three-dimensional heat conduction model. The solid region includes the graphite moderator

fuel assemblies and reactor vessel. Then the fuel salt in the channel is simulated with the one-dimensional single-phase flow model. The outer salt layer is simulated with either one-dimensional single-phase flow model or three-dimensional laminar flow model

which depends on the blocked situation. Finally

the temperature field and mass flow distribution of the 2MW experimental molten salt reactor is calculated with the thermal-hydraulic model

when the total mass flow in the outer salt layer reduces and the outer salt layer contains local blocked region.

Results

The simulation results show that the cooling effect of the outer salt layer is seriously influenced by the total mass flow in the outer salt layer. The results also reveal that the local blocking

a solid region with a diameter of 4 cm (close to the radius of down salt channel) exists in the outer salt layer

in the outer salt layer does not change the temperature field of the reactor obviously.

Conclusion

Base on the results

when the total mass flow in the outer salt layer is reduced to 0.365% of the rated mass flow

the maximum temperature of reactor vessel is close to 730 degree celsius

which is near the safety limit of alloy. And if the local blocking situation happens

the maximum temperature of the blocked region reaches 621.74 degree celsius

which is below the safety limit of alloy.

关键词

Keywords

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