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Title: USING TECHNOLOGY TO SUPPORT PROACTIVE MANAGEMENT OF MATERIALS DEGRADATION FOR THE U.S. NUCLEAR REGULATORY COMMISSION

Abstract

The majority of the U.S. reactor fleet is applying for license renewal to extend the operating life from the current 40 years to 60 years, and there is now active interest in extending the operating life to beyond 60 years. Many plants are also applying for increases in power rating and both of these changes increases the need for an improved understanding of materials degradation. Many materials degrade over time and much is known about the degradation of materials under normal environmental conditions; however, less is known about the characteristics of materials degradation when the environment is subject to higher than normal radiological conditions over extended periods of time. Significant efforts are being made by industrial, academic and regulatory groups worldwide to identify, classify and mitigate potential problems arising from degradation of components in this context. From a regulatory perspective, the U.S. Nuclear Regulatory Commission (USNRC) is very interested in being able to identify ways to insure their licensees proactively manage the identification of materials degradation and the mitigation of its effects. To date, the USNRC has consolidated “generic” programs for mitigating aging issues in the two volume Generic Aging Lessons Learned (GALL) Report (NUREG-1801) [1][2], and have encouraged applicantsmore » for license renewal to use these programs where applicable in their plant when applying for renew of their reactor’s license. The USNRC has also published a comprehensive report entitled Expert Panel Report on Proactive Materials Degradation (NUREG/CR-6923) [3] that inventories the types of degradation mechanisms that could exist in each component of a Light Water Reactor (LWR) and each degradation mechanism is assessed regarding how much is known about mitigating its effects. Since the number of plant designs and materials used varies greatly within the U.S. fleet, there are many variations to implementing aging management programs (AMPs), requiring significant dialogs between the Licensee and the USNRC. These discussions are part of the licensing basis and as such are documented with up to multi-hundred page responses that are loosely coupled through the USNRC Agency-wide Document Access and Management System (ADAMS), which serves as an electronic records repository for the USNRC . These discussions have supported revisions to the GALL, including the revision that is being prepared as this paper is being written. The USNRC has sought the help of the Pacific Northwest National Laboratory to improve the staff’s ability to navigate the significant numbers of documents that are generated in this process and to provide a forum for regulators, licensees and researchers to share knowledge in the efforts to improve the cyclic process for defining, applying, validating and re-defining AMPs. Work to date in this area is publicly accessible and this paper will describe that work and outline a potential path forward. The presenter will also demonstrate the capabilities of the PMMD information tools (http://pmmd.pnl.gov).« less

Authors:
; ;  [1];
  1. Gene
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1021295
Report Number(s):
PNNL-SA-71685
401001060; TRN: US1103939
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: 2010 Proceedings of the ASME Pressure Vessels & Piping Conference, July 18-22, 2010, Bellevue, Washington, 5:199-206
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; AGING; INVENTORIES; LICENSING; MANAGEMENT; MITIGATION; PRESSURE VESSELS; WATER

Citation Formats

Taylor, W Boyd, Knobbs, Katherine J, Carpenter, C E, and Malik, Shah. USING TECHNOLOGY TO SUPPORT PROACTIVE MANAGEMENT OF MATERIALS DEGRADATION FOR THE U.S. NUCLEAR REGULATORY COMMISSION. United States: N. p., 2010. Web. doi:10.1115/PVP2010-26063.
Taylor, W Boyd, Knobbs, Katherine J, Carpenter, C E, & Malik, Shah. USING TECHNOLOGY TO SUPPORT PROACTIVE MANAGEMENT OF MATERIALS DEGRADATION FOR THE U.S. NUCLEAR REGULATORY COMMISSION. United States. https://doi.org/10.1115/PVP2010-26063
Taylor, W Boyd, Knobbs, Katherine J, Carpenter, C E, and Malik, Shah. Mon . "USING TECHNOLOGY TO SUPPORT PROACTIVE MANAGEMENT OF MATERIALS DEGRADATION FOR THE U.S. NUCLEAR REGULATORY COMMISSION". United States. https://doi.org/10.1115/PVP2010-26063.
@article{osti_1021295,
title = {USING TECHNOLOGY TO SUPPORT PROACTIVE MANAGEMENT OF MATERIALS DEGRADATION FOR THE U.S. NUCLEAR REGULATORY COMMISSION},
author = {Taylor, W Boyd and Knobbs, Katherine J and Carpenter, C E and Malik, Shah},
abstractNote = {The majority of the U.S. reactor fleet is applying for license renewal to extend the operating life from the current 40 years to 60 years, and there is now active interest in extending the operating life to beyond 60 years. Many plants are also applying for increases in power rating and both of these changes increases the need for an improved understanding of materials degradation. Many materials degrade over time and much is known about the degradation of materials under normal environmental conditions; however, less is known about the characteristics of materials degradation when the environment is subject to higher than normal radiological conditions over extended periods of time. Significant efforts are being made by industrial, academic and regulatory groups worldwide to identify, classify and mitigate potential problems arising from degradation of components in this context. From a regulatory perspective, the U.S. Nuclear Regulatory Commission (USNRC) is very interested in being able to identify ways to insure their licensees proactively manage the identification of materials degradation and the mitigation of its effects. To date, the USNRC has consolidated “generic” programs for mitigating aging issues in the two volume Generic Aging Lessons Learned (GALL) Report (NUREG-1801) [1][2], and have encouraged applicants for license renewal to use these programs where applicable in their plant when applying for renew of their reactor’s license. The USNRC has also published a comprehensive report entitled Expert Panel Report on Proactive Materials Degradation (NUREG/CR-6923) [3] that inventories the types of degradation mechanisms that could exist in each component of a Light Water Reactor (LWR) and each degradation mechanism is assessed regarding how much is known about mitigating its effects. Since the number of plant designs and materials used varies greatly within the U.S. fleet, there are many variations to implementing aging management programs (AMPs), requiring significant dialogs between the Licensee and the USNRC. These discussions are part of the licensing basis and as such are documented with up to multi-hundred page responses that are loosely coupled through the USNRC Agency-wide Document Access and Management System (ADAMS), which serves as an electronic records repository for the USNRC . These discussions have supported revisions to the GALL, including the revision that is being prepared as this paper is being written. The USNRC has sought the help of the Pacific Northwest National Laboratory to improve the staff’s ability to navigate the significant numbers of documents that are generated in this process and to provide a forum for regulators, licensees and researchers to share knowledge in the efforts to improve the cyclic process for defining, applying, validating and re-defining AMPs. Work to date in this area is publicly accessible and this paper will describe that work and outline a potential path forward. The presenter will also demonstrate the capabilities of the PMMD information tools (http://pmmd.pnl.gov).},
doi = {10.1115/PVP2010-26063},
url = {https://www.osti.gov/biblio/1021295}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {7}
}

Conference:
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