ENS 40434
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ENS Event | |
|---|---|
06:27 Jan 10, 2004 | |
| Title | Technical Specification Required Shutdown Initiated And Subsequently Terminated |
| Event Description | During a surveillance of the Beaver Valley Power Station Unit No. 1 Solid State Protection System (SSPS) train "B" on 01/09/2004, a master relay contact exhibited unacceptable high resistance and was declared inoperable at 2042 hours0.0236 days <br />0.567 hours <br />0.00338 weeks <br />7.76981e-4 months <br />. Corrective action was initiated to replace the relay, which requires that the "B" train of the reactor trip system be transferred from the reactor trip breaker to the bypass reactor trip breaker and the "B" train of SSPS be de-energized. Action 40.b of Technical Specification 3.3.1.1, Table 3.3-1, Item 21 requires the Unit to be in at least Hot Standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> with one reactor trip breaker inoperable as a result of something other than an inoperable diverse trip feature. Bypassing the reactor trip breaker in order to replace the SSPS master relay makes the reactor trip breaker inoperable as a result of something other than an inoperable diverse trip feature.
The 'B' train Reactor Trip System reactor trip breaker was bypassed at 00:28 hours on 01/10/2004. Beaver Valley Power Station Unit No. 1 initiated a plant shutdown at 01:27 hours on 01/10/2004 in response to entering Action 40.b of Technical Specification 3.3.1.1, Table 3.3-1, Item 21. Action to replace the SSPS master relay was completed and the reactor trip breaker was returned to operability at 02:55 hours and the plant shutdown was terminated at 72% power. The Unit is scheduled to return to full power operation. Source Range N-31 re-energized when source range high voltage switch was restored to "Normal" position. Investigation is currently underway to determine the cause of this. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.78 h-0.0742 days <br />-0.0106 weeks <br />-0.00244 months <br />) | |
| Opened: | Al Hartner 04:40 Jan 10, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Jan 10, 2004 |
| 40434 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (72 %) |
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