05000285/FIN-2013008-29
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Finding | |
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| Title | Use of Alternate Seismic Evaluation Criteria |
| Description | 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. |
| Site: | Fort Calhoun  |
|---|---|
| Report | IR 05000285/2013008 Section 1R17 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | J Dixon M Schneider P Elkmann R Kellara Klettc Smith M Davis J Josey C Bickett G Warnick M Hay J Brand J Groom M Keefe R Latta W Schaup J Watkins B Hagar A Allen J Wingebach K Martin L Wilkins S Morrow R Deese F Ramirez |
| INPO aspect | |
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Finding - Fort Calhoun - IR 05000285/2013008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fort Calhoun) @ 2013Q2
Self-Identified List (Fort Calhoun)
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