Prediction and Monitoring Systems of Creep-Fracture Behavior of 9Cr-1Mo Steels for Teactor Pressure Vessels

Potirniche, Gabriel¹  Barlow, Fred D.¹  Charit, Indrajit¹  Rink, Karl¹ 

[1] Univ. of Idaho, Moscow, ID (United States)

关键词: CHROMIUM-MOLYBDENUM STEELS;    CREEP;    FRACTURES;    PRESSURE VESSELS;    WELDED JOINTS;    MICROSTRUCTURE;    FINITE ELEMENT METHOD;    NUCLEAR POWER PLANTS;    MONITORING;    DAMAGE;    CYLINDERS;    FRACTURE PROPERTIES;    SERVICE LIFE;    AGING;    FORECASTING;    LEAKS;    PLASTICITY;    SIMULATION;    DESIGN;    PERFORMANCE;    TEXTURE;    DYNAMIC LOADS;   

DOI  :  10.2172/1110643
RP-ID  :  DOE/NEUP--09-835
PID  :  OSTI ID: 1110643
Others  :  TRN: US1600899

美国|英语

来源: SciTech Connect

【 摘 要 】

A recent workshop on next-generation nuclear plant (NGNP) topics underscored the need for research studies on the creep fracture behavior of two materials under consideration for reactor pressure vessel (RPV) applications: 9Cr-1Mo and SA-5XX steels. This research project will provide a fundamental understanding of creep fracture behavior of modified 9Cr-1Mo steel welds for through modeling and experimentation and will recommend a design for an RPV structural health monitoring system. Following are the specific objectives of this research project: Characterize metallurgical degradation in welded modified 9Cr-1Mo steel resulting from aging processes and creep service conditions; Perform creep tests and characterize the mechanisms of creep fracture process; Quantify how the microstructure degradation controls the creep strength of welded steel specimens; Perform finite element (FE) simulations using polycrystal plasticity to understand how grain texture affects the creep fracture properties of welds; Develop a microstructure-based creep fracture model to estimate RPVs service life; Manufacture small, prototypic, cylindrical pressure vessels, subject them to degradation by aging, and measure their leak rates; Simulate damage evolution in creep specimens by FE analyses; Develop a model that correlates gas leak rates from welded pressure vessels with the amount of microstructural damage; Perform large-scale FE simulations with a realistic microstructure to evaluate RPV performance at elevated temperatures and creep strength; Develop a fracture model for the structural integrity of RPVs subjected to creep loads; and Develop a plan for a non-destructive structural health monitoring technique and damage detection device for RPVs.