05000259/FIN-2012002-05
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Unit 1 Technical Specification 3.3.8.2, Reactor Protection System (RPS) Electric Power Monitoring, required that, for each in-service RPS motor generator set or alternate power supply, two RPS electric power monitoring assemblies be operable in Modes 1, 2, and 3; and in Modes 4 and 5 with any control rod withdrawn from a core cell containing one or more fuel assemblies. With one electric power monitoring assembly inoperable for one or both in-service power supplies, the associated in-service power supply(s) were required to be removed from service in 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in Mode 4 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. In addition, TS 3.0.4 prohibited Mode changes with TS 3.3.8.2 not met. Contrary to this, on October 6, 2011, while performing an operability determination for the channel A RPS power monitoring system under-voltage trips, the licensee determined that the as-found under-voltage trip for the RPS 1A1 relay was less than the required TS acceptance criteria during multiple previous TS surveillances and that the RPS 1A1 relay was inoperable from April 30, 2007 to October 5, 2011. This TS violation was entered into the licensees CAP as PERs 413140 and 442914. The finding was determined to be of very low safety significance because the finding does not represent an actual loss of the RPS safety function in that the remaining operable channel A RPS electric power monitoring assembly still provided protection to the RPS bus powered components under degraded voltage conditions. |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2012002 Section 4OA7 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Fletcher C Stancil E Guthrie K Korth L Pressley P Niebaum R Carrion |
| INPO aspect | |
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Finding - Browns Ferry - IR 05000259/2012002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2012Q1
Self-Identified List (Browns Ferry)
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