Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (1): 10601-010601.doi: 10.11889/j.0253-3219.2019.hjs.42.010601

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Inelastic creep damage analysis of RPV nozzle in TMSR-LF1 based on damage mechanics

Xiaoyan WANG1,2,Xiao WANG1,2(),Xiaochun ZHANG1,2,Shifeng ZHU1,2   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. Innovative Academies in TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2018-08-21 Revised:2018-11-15 Online:2019-01-10 Published:2019-01-25
  • Contact: Xiao WANG E-mail:wangxiao@sinap.ac.cn
  • Supported by:
    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA02010000)

Abstract: Background

The reactor pressure vessel (RPV) of thorium molten salt reactor-liquid fuel 1 (TMSR-LF1) has been designed to operate at 650 °C for long-term period, therefore, it is extremely important to analyze its creep damage.

Purpose

This study aims to calculate and assess the creep damage of the RPV nozzle in TMSR-LF1 with an inelastic analysis method.

Methods

Based on damage mechanics theory, firstly, the material constants of Lemaitre multi-axial creep damage model are obtained by fitting the creep test data of UNS N10003 alloy at 650 °C. Then the equivalent stress and creep damage of the RPV nozzle in TMSR-LF1 under normal operating conditions are calculated by finite element analysis.

Results

The theoretical prediction values of creep fracture life are basically consistent with the experimental results, with a maximum error of 7.38%. The calculation results indicate that the maximum creep damage of the RPV nozzle in TMSR-LF1 reaches 0.082, which meets the 10-year life limit requirement.

Conclusions

The analysis method and results have certain reference value for the structural integrity evaluation of elevated temperature equipment in TMSR.Key wordsTMSR-LF1, RPV, UNS N10003 alloy, Damage mechanics, Multi-axial creep damage