FAD of different welded structures for joining safe end to pipe-nozzle of nuclear pressure vessel

Jianbin PAN; Guozhen WANG; Fuzhen XUAN; Shandong TU

doi:10.11889/j.0253-3219.2017.hjs.40.050605

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FAD of different welded structures for joining safe end to pipe-nozzle of nuclear pressure vessel

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

- FAD of different welded structures for joining safe end to pipe-nozzle of nuclear pressure vessel
- NUCLEAR TECHNIQUES Vol. 40, Issue 5, Article number: 050605(2017)
- 作者机构：
  
  华东理工大学承压系统与安全教育部重点实验室上海 200237
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China;Supported by National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2017.hjs.40.050605
  CLC： TL48
- Received：29 December 2016，
  
  Revised：08 March 2017，
  
  Published：10 May 2017
- 稿件说明：
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Jianbin PAN, Guozhen WANG, Fuzhen XUAN, et al. FAD of different welded structures for joining safe end to pipe-nozzle of nuclear pressure vessel[J]. Nuclear techniques, 2017, 40(5): 050605
DOI：

Jianbin PAN, Guozhen WANG, Fuzhen XUAN, et al. FAD of different welded structures for joining safe end to pipe-nozzle of nuclear pressure vessel[J]. Nuclear techniques, 2017, 40(5): 050605 DOI： 10.11889/j.0253-3219.2017.hjs.40.050605.

摘要

基于英国R6规范选择3的方法构建了核压力容器接管安全端两种异种金属焊接结构（含隔离层的四材料结构和不含隔离层的三材料结构）的失效评定图（Failure assessment diagram，FAD），并分析了裂纹位置和裂纹深度对FAD的影响。结果表明，两种结构的极限载荷基本相同，裂纹位置对极限载荷基本没有影响。随裂纹位置由管嘴向316L安全端管区域靠近及随裂纹深度的增加，失效评定曲线（Failure assessment curve，FAC）下移，结构的安全性降低。由于两种焊接结构中，相同位置、相同尺寸裂纹的FAD和极限载荷基本相同，因而其抗断裂性能和结构强度基本相同。

Abstract

Background

Dissimilar metal welded joints (DMWJ) were indicated to be vulnerable components in the primary system

and an accurate structural integrity assessment for such DMWJ is needed. Three-material DMWJ structures without buttering layer are also applied in recent years.

Purpose & Methods

In order to understand the effects of crack locations and crack sizes on failure assessment diagrams (FAD)

FADs of two types of dissimilar metal welded structures (four-material structure with buttering layer and three-material structure without buttering layer) for joining safe end to pipe-nozzle of nuclear pressure vessel were constructed by finite element numerical analysis.

Results

Limit loads of the two welded structures are basically the same

and the crack locations almost have no effects on the limit loads. With moving crack location from pipe nozzle to 316L safe end pipe and increasing crack depth

the failure assessment curves (FACs) shift downward and the safety margin of the cracked structure decreases.

Conclusions

Because the FADs and limit loads of the cracks with the same location and size in the two welded structures are basically the same

their properties against fracture failure and structural strength are almost the same. It is feasible to connect pipe-nozzle with safe end using simplified manufacture process without buttering layer for the consideration of cost saving.

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Keywords

references

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