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The Thermal Aging Embrittlement of Cast Au … The Thermal Aging Embrittlement of Cast Austenitic Stainless Steel Program aging management program included evaluation of the reactor coolant piping as bounded by the leak-before-break analysis, assessment of other cast austenitic stainless steel components for susceptibility to thermal embrittlement, and performance of volumetric inspection of piping or component-specific flaw tolerance evaluation for susceptible components. The team reviewed program basis document, reviewed scoping evaluations, the license renewal application, the NRC safety evaluation report, and the updated safety analysis report supplement and interviewed the program owner. The team identified that the licensee documented this aging management program in Program Basis Document PBD-39, Thermal Aging Embrittlement of Cast Austenitic Stainless Steel, Revision 1 Commitment 34 specified, Develop the thermal aging embrittlement of cast austinetic stainless steel program that reflects the program elements of GALL AMP XI.M12, and other commitments in response to the NRC staff\'s review, as documented in the responses to staff requests for additional information and potential open items. The team determined that the licensee opted to manage thermal aging embrittlement of cast austinetic stainless steel components in the reactor coolant system through a flaw tolerance evaluation of the main reactor coolant system cast austinetic stainless steel piping. The licensee evaluated the maximum flaw size that could remain in service until the end of the period of extended operation considering thermal aging embrittlement and using the methodology recommended in the GALL Report (i.e. ASME, Section XI, Subsection IWB-3640). However, the team identified two deficiencies associated with the assumptions and conclusions in the flaw tolerance evaluation: The licensee inappropriately ruled out stress corrosion cracking effects in the flaw tolerance evaluation performed for the reactor coolant system cast austinetic stainless steel piping based on the effectiveness of the Water Chemistry Program aging management program (i.e., concluding that stress corrosion cracking was not a credible aging effect requiring management). The team determined that the license renewal application and safety evaluation report described that the licensee credited the thermal aging embrittlement of cast austinetic stainless steel aging management program for managing crack initiation and growth due to stress corrosion cracking and loss of fracture toughness due to thermal aging embrittlement. The conclusions about the resulting postulated flaw sizes did not provide any correlation between the postulated flaw sizes and the detection capability of the non-destructive in-service inspection examination technique currently used or expected to be used. The team determined that postulating flaws without confirming that a qualified non-destructive examination technique could detect the flaws provided insufficient technical justification to reasonably assure that the applicable aging effects would be managed. The team determined that the licensee documented this deficiency in Condition Report 2013-11991. Follow-up and evaluation of licensee corrective actions to address thermal aging embrittlement of cast austinetic stainless steel components in accordance with the GALL Report and the licensing basis is an unresolved item.the licensing basis is an unresolved item.
23:59:59, 30 September 2013 +
23:59:59, 30 September 2013 +
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Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
00:50:09, 21 February 2018 +
23:59:59, 30 September 2013 +