Development of thermal creep model for reactor pressure vessel lower head and application in OLHF experimental analysis

被引：0
|
作者：
Yang H. [1 ]
Zhang B. [1 ,2 ]
Gao P. [1 ]
Tang S. [1 ]
Shan J. [1 ,2 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[2] State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
He Jishu/Nuclear Techniques | 2022年 / 45卷 / 08期
关键词：
Creep failure; In-vessel retention; Lower head; OLHF experiment;
D O I：
10.11889/j.0253-3219.2022.hjs.45.080603
中图分类号：
学科分类号：
摘要：
[Background] In the event of a reactor severe accident, in-vessel retention (IVR) is a very effective and important severe accident mitigation measure. The lower head of the reactor pressure vessel (RPV) plays an important role in IVR strategy. The lower head is in a high-temperature environment, and its main failure form is creep failure. Once the lower head fails, it may lead to the release of radioactive substances into the environment. [Purpose] This study aims to develop a thermal creep model for reactor pressure vessel lower head to ensure the successful implementation of IVR strategy and prevent radioactive material leakage, and apply this model to OECD lower head failure (OLHF) experiment analysis. [Methods] The thin shell theory and Norton-Bailey creep equation were employed to develop the lower head thermal creep module (LHTCM) model, and four failure criteria were used to evaluate the integrity of the lower head. Then, the LHTCM model was integrated into the integrated severe accident analysis program ISAA to verify and calculate the OLHF experimental data. [Results] Through the analysis of four failure criteria in LHTCM model, it is found that the relative error between the failure time of the lower head predicted by the LHTCM model using the Larson Miller criterion and the experimental data is within 2.0%, and its predicted the elongation at the bottom of the lower head is more consistent with the experimental data than the other three criteria such as Kachanov criterion. [Conclusions] LHTCM model developed in this study can accurately predict the creep behaviour of the lower head, and the calculated failure time, position and bottom elongation of the lower head are in good agreement with the experimental results. © 2022 Science Press. All rights reserved.
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