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Title: Praise enhancements to include general strain hardening exponents and mid-life residual stress and water chemistry changes

Abstract

The purpose of this document is to describe some recent changes made to the PRAISE Code to provide some additional capabilities. The major changes are associated with the new capability to analyze cases where there is a mid-life change in residual stresses and/or water chemistry. Such changes have been proposed as a means of improving the reliability of BWR piping by reducing the oxygen content of the coolant (or other favorable chemistry changes) or altering the residual stresses near welds to provide a stress distribution less favorable to crack initiation and growth. Induction heating stress improvement (IHSI) and mechanical stress improvement process (MSIP) are considered, with the time at which the process is implemented defined by the user. As-welded residual stresses are considered to be present prior to the stress imrovement treatment. Improved pre- and post-processors were also developed and are described, which should be particularly useful to users of the PC version of PRAISE. In addition, improved J-integral solutions are incorporated that allow a treatment of general Ramberg-Osgood strain hardening, rather than the specific values of the strain hardening exponent included in earlier versions of the PRAISE Code. This document discusses only the new additions to the code andmore » is an addition to earlier documentation. Some example results are presented, and the Appendix provides a complete updated description of the input cards for the newly expanded PRAISE-CC Code. 10 refs., 13 figs.« less

Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA); Failure Analysis Associates, Inc., Menlo Park, CA (USA)
Sponsoring Org.:
DOE/DP
OSTI Identifier:
6299600
Report Number(s):
UCRL-CR-105339
ON: DE91005197
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; REACTOR COOLING SYSTEMS; FRACTURE MECHANICS; P CODES; PIPES; RESIDUAL STRESSES; CRACK PROPAGATION; STRESS CORROSION; WATER CHEMISTRY; WELDED JOINTS; CHEMICAL REACTIONS; CHEMISTRY; COMPUTER CODES; COOLING SYSTEMS; CORROSION; ENERGY SYSTEMS; JOINTS; MECHANICS; REACTOR COMPONENTS; REACTORS; STRESSES; WATER COOLED REACTORS; WATER MODERATED REACTORS; 210100* - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled

Citation Formats

. Praise enhancements to include general strain hardening exponents and mid-life residual stress and water chemistry changes. United States: N. p., 1990. Web. doi:10.2172/6299600.
. Praise enhancements to include general strain hardening exponents and mid-life residual stress and water chemistry changes. United States. doi:10.2172/6299600.
. Thu . "Praise enhancements to include general strain hardening exponents and mid-life residual stress and water chemistry changes". United States. doi:10.2172/6299600. https://www.osti.gov/servlets/purl/6299600.
@article{osti_6299600,
title = {Praise enhancements to include general strain hardening exponents and mid-life residual stress and water chemistry changes},
author = {},
abstractNote = {The purpose of this document is to describe some recent changes made to the PRAISE Code to provide some additional capabilities. The major changes are associated with the new capability to analyze cases where there is a mid-life change in residual stresses and/or water chemistry. Such changes have been proposed as a means of improving the reliability of BWR piping by reducing the oxygen content of the coolant (or other favorable chemistry changes) or altering the residual stresses near welds to provide a stress distribution less favorable to crack initiation and growth. Induction heating stress improvement (IHSI) and mechanical stress improvement process (MSIP) are considered, with the time at which the process is implemented defined by the user. As-welded residual stresses are considered to be present prior to the stress imrovement treatment. Improved pre- and post-processors were also developed and are described, which should be particularly useful to users of the PC version of PRAISE. In addition, improved J-integral solutions are incorporated that allow a treatment of general Ramberg-Osgood strain hardening, rather than the specific values of the strain hardening exponent included in earlier versions of the PRAISE Code. This document discusses only the new additions to the code and is an addition to earlier documentation. Some example results are presented, and the Appendix provides a complete updated description of the input cards for the newly expanded PRAISE-CC Code. 10 refs., 13 figs.},
doi = {10.2172/6299600},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {6}
}