05000275/FIN-2010007-08
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Finding | |
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Title | Inadequate Drawings and Procedures to Align
Emergency Makeup Water Supply from Diablo Canyon Creek to Support the Auxiliary Feedwater System |
Description | The team identified a noncited violation of Diablo Canyon Technical Specification 5.4.1. \"Procedures,\" for failure to have a procedure. The Diablo Canyon Final Safety Analysis Report Update, Revision 18, Section 6.5.2.1.1 documents the design of the auxiliary feedwater system and credits eight sources of water that can provide backup means of supply in the event that its primary source of water, the condensate storage tank, becomes exhausted. One of the sources included is the Diablo Canyon Creek. Diablo Canyon Technical Specification 5.4.1 states: \"Written procedures shall be established, implemented, and maintained covering the following activities: [a.] The applicable procedures recommended in NRC Regulatory Guide 1.33, Revision 2, Appendix A, February 1978\". NRC Regulatory Guide 1.33, Revision 2, Appendix A, describes procedures under Items 31 (instructions for shutdown, startup, and operation, including system filling, of the auxiliary feedwater system) and 6j (loss of feedwater system or feedwater system failure). Contrary to Technical Specification 5.4.1, on March 4, 2010, the team identified that the licensee did not have an established procedure to accomplish the task identified in the Final Safety Analysis Report Update, Section 6.5.2.1.1 for taking water from the Diablo Canyon Creek to be a supply for the auxiliary feedwater system. This item identified in the licensee\'s corrective action document Notification 50298563. Failure to provide a procedure or instructions and acceptance criteria to perform an emergency makeup water alignment to the auxiliary feedwater system is a performance deficiency. Using Inspection Manual Chapter 0612, Appendix B, the performance deficiency is more than minor because it is associated with the Mitigating Systems Cornerstone attribute of procedure quality, and the lack of having this procedure affects the ability to ensure the availability, reliability, and capability of the auxiliary feedwater system to respond to initiating events to prevent undesirable consequences, (i.e., core damage, and it was within the licensee\'s ability to correct this problem.) Using the Inspection Manual Chapter 0609, \"Significance Determination Process,\" Phase 1 Worksheets, the finding was determined to have very low safety significance (Green) because it was not a design issue resulting in loss of function, did not represent an actual loss of a system safety function, did not result in exceeding a technical specification allowed outage time, and did not affect external event mitigation. The team concluded that this finding had a crosscutting aspect in the area of problem identification and resolution, in that the licensees\' corrective action program thoroughly evaluates problems such that the resolutions address causes and the extent of conditions, as necessary. Per licensee Notification 50298563, changes were made to pumping systems associated with the Diablo Canyon Creek in 2007, which affected the ability to pump water through the discussed credited lineup supporting the auxiliary feed\\,v8ter system. This effect was not identified as part of the changes, so no review of procedures related to the emergency auxiliary feedwater system alignment in question was performed. Since these actions occurred within the last three years, this performance characteristic reflects current performance. |
Site: | Diablo Canyon ![]() |
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Report | IR 05000275/2010007 Section 1R21 |
Date counted | Jun 30, 2010 (2010Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | T Farnholtz S Makor B Correll S Hedger R Kbpriva |
CCA | P.2, Evaluation |
INPO aspect | PI.2 |
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Finding - Diablo Canyon - IR 05000275/2010007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2010Q2
Self-Identified List (Diablo Canyon)
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