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The team identified an unresolved item ass … The team identified an unresolved item associated with the licensees use of alternate seismic criteria when evaluating site structures. The alternate seismic criteria were approved for use by the NRC for piping and HVAC systems but were not explicitly approved for structures. The team identified that the licensee applied an alternate seismic evaluation method called Alternate Seismic Criteria Methodology in place of the original USAR seismic criteria delineated in Appendix F. The use of ASCM was originally proposed to the NRC on December 2, 1988, as alternate design criteria for new designs, modifications, and reanalysis of piping and pipe supports, electrical raceways, HVAC ducting, and anchor bolts. The team reviewed licensing documents and correspondence, and concluded that the NRC approved the use of ASCM for piping and HVAC systems and that the licensee had assumed the NRC had tacitly approved ASCM for structural calculations because the NRC staff did not specifically deny its use in those areas. The licensee informed the team that ASCM was used in several structural seismic evaluations including the auxiliary building and intake structure. At the close of the inspection, other potentially affected structures were being evaluated by the licensee. The team is concerned that the licensee inappropriately used ASCM without NRC approval and that ASCM may be non-conservative with respect to the seismic evaluation criteria specified in the USAR, Appendix F. The effect of the alternative seismic analysis is not known because the seismic spectra are different and are too complex for a qualitative analysis. Additional NRC review and follow up will be required to determine if this issue represents a performance deficiency or constitutes a violation of NRC requirements. This issue is identified as URI 05000285/2013008-29, Use of Alternate Seismic Evaluation Criteria. of Alternate Seismic Evaluation Criteria. +

Discovered date

23:59:59, 30 June 2013 +

Docket

05000285 +

Event date

23:59:59, 30 June 2013 +

Finding

05000285/FIN-2013008-29 +

Finding integer

29 +

Finding type

URI +

Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

IR 05000285/2013008 +

Inspector

Rick Deese +, R Latta +, M Keefe +, J Watkins +, M Hay +, B Hagar +, F Ramirez +, A Allen +, J Wingebach +, K Martin +, M Schneider +, Javier Brand +, Klettc Smith +, John Dixon +, Carey Bickett +, Paul Elkmann +, Jeremy Groom +, Marlone Davis +, William Schaup +, Greg Warnick +, Stephanie Morrow +, Jeffrey Josey +, R Kellara + and Lynnea Wilkins +

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>.

00:50:03, 21 February 2018 +

Person

Rick Deese +, R Latta +, M Keefe +, J Watkins +, M Hay +, B Hagar +, F Ramirez +, A Allen +, J Wingebach +, K Martin +, M Schneider +, Javier Brand +, Klettc Smith +, John Dixon +, Carey Bickett +, Paul Elkmann +, Jeremy Groom +, Marlone Davis +, William Schaup +, Greg Warnick +, Stephanie Morrow +, Jeffrey Josey +, R Kellara + and Lynnea Wilkins +

2013Q2 +

23:59:59, 30 June 2013 +

System

HVAC +

Title

Use of Alternate Seismic Evaluation Criteria +

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