05000336/FIN-2010006-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, requires, in part, that measures shall be established to assure that conditions adverse to quality, such as failures, malfunctions, deficiencies, deviations, defective material and equipment, and nonconformances are promptly identified and corrected. Contrary to the above, from July 24, 2008, to July 24, 2009, Dominion did not take adequate corrective action to identify and correct a degraded Unit 2 TDAFW pump steam trap to preclude a repeat overspeed trip during TDAFW pump start-up due to excessive moisture in the steam supply line. Dominion identified the deficiency during a TDAFW valve ST, promptly initiated CR 342844, and performed a thorough and self-critical ACE. This issue was apparent during plant start-up (Le., during TDAFW starts in Mode 3), when moisture accumulation would be increased. During power operation, procedural controls were effective in removing moisture in the steam supply line as demonstrated during past surveillance tests while operating at power. The finding was more than minor because it impacted the equipment performance attribute of the Mitigating Systems cornerstone and the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). In accordance with NRC Inspection Manual Chapter (IMC) 0609, Attachment4, the team performed a Phase 1 Significance Determination Process screening. Based on Table 4a in IMC 0609, Attachment 4, the team determined that the finding was of very low safety significance because it was not a design or qualification deficiency, did not represent an actual loss of system safety function, did not represent an. actual loss of safety function of a single train for greater than the technical specification allowed outage time, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating events |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2010006 Section 4OA7 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | P Kaufman D Jackson S Pindale J Schoppy J Krafty |
| INPO aspect | |
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Finding - Millstone - IR 05000336/2010006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2010Q1
Self-Identified List (Millstone)
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