05000259/FIN-2009007-02
From kanterella
Jump to navigation
Jump to search
Finding | |
---|---|
Title | Containment Isolation Valves not Included in the Appendix R Separation Analysis |
Description | The team identified a URI concerning whether the containment isolation valves (CIVs) were included and properly analyzed for availability in the Appendix R separation analysis to ensure closure to support COP and NPSH requirements for postulated fires in certain FAs. TVA submitted a letter to the NRC dated November 15, 2007, Browns Ferry Nuclear Plant (BFN) - Units 1, 2, and 3 - Technical Specifications (TS) Changes TS-431 and TS-418 - Extended Power Uprate (EPU) - Response to Round 13 Request for Additional Information (RAI) - Containment Overpressure APLA-35/37. In that letter, TVA indicated that the analysis for Appendix R showed that credit for COP was needed during certain fire scenarios to ensure adequate NPSH for the residual heat removal (RHR) pump operating in the alternate shutdown cooling mode for a postulated worst case fire event. However, fire damage to circuits of CIVs could cause failure to close or spurious opening of the CIVs which could result in the depressurization of the primary containment. The TVA letter further stated that the FAs in which COP would be needed were reviewed and TVA concluded from the review that none of the CIV cables that could cause spurious opening (downstream of the MCR hand switches) were located in the FAs of concern. However, during this inspection, TVA personnel informed the team that the CIVs were not included in the Appendix R separation analysis and may not have been analyzed for fire induced spurious actuations in the FAs of concern where COP was needed to ensure adequate NPSH. The information discussed with the team during this inspection regarding the CIVs did not appear to be consistent with the information provided in the licensees November 15, 2007, letter to the NRC. The team questioned the adequacy of the SSA (i.e., were the CIV cables sufficiently analyzed for spurious actuation in the FAs where COP was needed) in that the CIVs were not included as minimum SSD system equipment necessary for COP for the alternate shutdown cooling mode. The licensee initiated PER 169484 to review the Appendix R separation analysis to determine if the CIVs needed to be included in the analysis. The team noted that the licensees EPU license amendment request submittals were being reviewed by NRR and questions had been raised regarding the COP needed to ensure adequate NPSH requirements for the available RHR pump. The team discussed the CIV issue with the NRR licensing project manager for BFN to ensure NRR awareness and consideration of the issue during review of the licensees EPU license amendment request. This issue is unresolved pending further NRR review of the licensees analysis of the CIV cables for potential impact on the COP and NPSH concerns associated with the EPU. This CIV issue is identified as URI 05000259, 260, 296/2009007-02, Containment Isolation Valves not Included in the Appendix R Separation Analysis |
Site: | Browns Ferry |
---|---|
Report | IR 05000259/2009007 Section 1R05 |
Date counted | Jun 30, 2009 (2009Q2) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.05 |
Inspectors (proximate) | G Pick K Miller L Suggs M Thomas P Fillion P Qualls R Neaseb Metzgerc Kontz L Suggs M Thomas P Qualls R Nease |
INPO aspect | |
' | |
Finding - Browns Ferry - IR 05000259/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Browns Ferry) @ 2009Q2
Self-Identified List (Browns Ferry)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||