05000250/FIN-2011002-01
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Finding | |
|---|---|
| Title | Failure to Monitor a Reactivity Change Results in Power Operation Above 100 Percent |
| Description | The inspectors identified a non-cited violation (NCV) of Technical Specifications 6.8.1.a, Procedures, when operators did not adequately monitor reactor power nor the position of valve TC-3-144A, a valve which affects reactivity, during a letdown valve inservice test. As a result, the Unit 3 hourly average reactor power increased above 100 percent for about 40 minutes. When identified to the licensee by the inspectors, the issue was documented in the corrective action program as AR 1643603. Failure to maintain positive control of reactor power was contrary to plant procedures and was a performance deficiency. The issue was more than minor because it resulted in reactor operation at 100.05 percent power for about 40 minutes. The finding involved configuration control affecting reactivity and was assigned to the Barrier Integrity Cornerstone. In accordance with screening criteria in IMC 0609, Appendix A, Phase 1, for degraded fuel barrier, the issue screened as Green. The finding was determined to be of very low safety significance because throughout the incident, thermal power remained bounded by the reactor safety analyses limit of 102% and no safety limits were exceeded. The finding affected the cross-cutting area of Human Performance, Work Practices, (H.4(a)) when operating personnel were not aware of reactor status, and human error prevention techniques, such as holding pre-job briefings, self and peer checking, and proper documentation of activities were not adequate to assure plant activities were properly performed. |
| Site: | Turkey Point  |
|---|---|
| Report | IR 05000250/2011002 Section 1R22 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | R Taylor M Barillas D Rich J Stewart S Schroer |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Turkey Point - IR 05000250/2011002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Turkey Point) @ 2011Q1
Self-Identified List (Turkey Point)
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