不同级钚材料的衰变放热功率计算分析

左应红; 朱金辉

doi:10.11889/j.0253-3219.2016.hjs.39.010502

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不同级钚材料的衰变放热功率计算分析

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- 不同级钚材料的衰变放热功率计算分析
- Analysis of decay heat power generation for plutonium with various grades
- 核技术 2016年39卷第1期文章编号：010502
- 作者机构：
  
  西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室西安 710024
  State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an 710024, China
- 作者简介：
  
  左应红,男,1987年出生,2014年于清华大学获博士学位,研究领域为核技术及应用
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.010502
  中图分类号： TL27
- 收稿日期：2015-02-09，
  
  录用日期：2015-10-15，
  
  纸质出版日期：2016-01-25
- 稿件说明：
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左应红, 朱金辉. 不同级钚材料的衰变放热功率计算分析[J]. 核技术, 2016,39(1):010502

Yinghong ZUO, Jinhui ZHU. Analysis of decay heat power generation for plutonium with various grades[J]. Nuclear techniques, 2016, 39(1): 010502
左应红, 朱金辉. 不同级钚材料的衰变放热功率计算分析[J]. 核技术, 2016,39(1):010502 DOI： 10.11889/j.0253-3219.2016.hjs.39.010502.

Yinghong ZUO, Jinhui ZHU. Analysis of decay heat power generation for plutonium with various grades[J]. Nuclear techniques, 2016, 39(1): 010502 DOI： 10.11889/j.0253-3219.2016.hjs.39.010502.

摘要

钚材料中放射性核素会不断衰变并释放能量

改变钚材料及周围部件的温度。为研究不同级钚材料在其整装存储及运输过程中衰变放热功率随时间的变化规律

依据不同级钚材料的放射性核素组分

在分析核素级联衰变规律的基础上

并在物理模型中考虑衰变时的能量分支比

计算得到了武器级钚、反应堆级和混合级钚材料中各核素的衰变放热功率和总热功率随时间的演变规律。计算结果表明

1kg不同级的钚材料

其衰变放热功率最大的是混合级钚

放热最少的是武器级钚;武器级钚材料衰变放热功率主要来自于

239

而反应堆级与混合级钚材料的衰变放热功率主要来自于

241

Pu和

238

Pu。三种不同级钚材料中

242

Pu的衰变放热功率均很小。考虑能量分支比后

可更准确地计算给出钚材料的衰变热功率。

Abstract

Background:

Radioactive nuclides contained in plutonium material will continually decay and release energy

which will change the temperature of plutonium materials and the surrounding components.

Purpose:

This study aims to analyze the releasing heat power of various grades plutonium materials in the process of bulk storage and transportation of plutonium.

Methods:

According to the isotopic quality composition of various grades plutonium

the time evolutions of decay heat power of each radioactive nuclide contained in weapons grade plutonium

reactor grade plutonium

and mixed oxide grade plutonium are obtained. And the total decay heat power of various grades plutonium as a function of time is also calculated

on the basis of the analysis of radionuclide decay cascade regulation

with the energy branching ratios during decay in the physical model taken into consideration.

Results:

The calculation results showed that the decay heat power varied with the grades of plutonium material. For 1-kg different grades plutonium material

the maximum decay heat power quantity is released by mixed oxide grade plutonium

while the weapons grade plutonium releases the least decay heat power quantity. The heat power released by weapons grade plutonium is mainly from

239

while the main heat power is from

241

Pu and

238

Pu for the reactor and mixed oxide grade plutonium material. The decay heat power released by

242

Pu is few compared with other nuclides for the three grades

of plutonium materials.

Conclusion:

The releasing decay heat power of plutonium materials can be calculated more accurately by considering the energy branching ratios.

关键词

Keywords

references

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