05000361/FIN-2012002-05
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Technical Specifications 3.8.1, AC Sources - Operating, limiting condition for operation requires that AC electrical sources shall be operable in Modes 1 through 4. Technical Specification 3.8.9, Distributions Systems Operating, limiting condition for operation requires that AC and DC electrical power distribution systems shall be operable in Modes 1 through 4. If one required offsite circuit is inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, or one AC electrical power distribution system is inoperable for greater than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, the required action is to place the unit in Mode 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Contrary to the above, on September 2, 2010, operations personnel failed to comply with required action of Technical Specification 3.8.9 limiting condition for operation to restore train A Class 1E 4kV bus 3A04 (AC electrical power distribution system) to operable status or place the unit in Mode 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />; and on September 5, 2010, operations personnel failed to comply with required action of Technical Specification 3.8.1 limiting condition for operation to restore bus 3A04 feeder breaker from the reserve auxiliary transformer (AC electrical source) to operable status or place the unit in Mode 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. A Phase 3 evaluation was performed by a senior reactor analyst since the finding screened as potentially risk-significant due to a seismic initiating event. Using the San Onofre SPAR model, the delta-CDF for Bus 3A04 being non-functional was 5.2E-7/yr. The exposure period for this finding was 10.7 days over the TS 3.8.1 AOT and 13.37 days over the TS 3.8.9 allowed outage time. Therefore, this finding was determined to have very low significance (Green). This issue was entered into licensees corrective action program as Nuclear Notification NN 201113611. |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2012002 Section 4OA7 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Lantz L Carson J Melfi J Reynoso J Laughlin G Warnick I Anchando N Greene D You |
| INPO aspect | |
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Finding - San Onofre - IR 05000361/2012002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2012Q1
Self-Identified List (San Onofre)
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