ENS 42606
ENS Event | |
|---|---|
18:15 May 26, 2006 | |
| Title | Solid State Protection System Train Inoperable |
| Event Description | Beaver Valley Unit 1 commenced a Technical Specification required shutdown at 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br /> due to Train B Solid State Protection System inoperable. The condition was discovered during testing and the Unit is required to be in Mode 3 by 1846 hours0.0214 days <br />0.513 hours <br />0.00305 weeks <br />7.02403e-4 months <br />. Train A of Solid State Protection System remains operable and in service. Investigation of the Solid State Protection problem is in progress.
The licensee believes that the problem is caused by a faulty memory card. They are continuing to investigate the problem. The unit was at 18% power at 1727 EDT on the way to mode 3. The licensee notified the NRC Resident Inspector.
Beaver Valley Unit 1 entered mode 3 at 1831 hours0.0212 days <br />0.509 hours <br />0.00303 weeks <br />6.966955e-4 months <br /> on 5/26/06. Train B Solid State Protection was repaired and tested satisfactorily. It was returned to OPERABLE status at 1915 hours0.0222 days <br />0.532 hours <br />0.00317 weeks <br />7.286575e-4 months <br /> on 5/26/06. The failure was in the memory portion of the universal logic card in the low power trip block circuitry. A root cause investigation is ongoing. All technical specifications action statements were exited when Train B Solid State Protection was declared OPERABLE. Reactor start up is planned for 0500 on 5/27/06. The licensee will notify the NRC Resident Inspector. Notified R1DO (M. Gray). |
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| LER: | 05000334/LER-2006-002 |
| Time - Person (Reporting Time:+-0.8 h-0.0333 days <br />-0.00476 weeks <br />-0.0011 months <br />) | |
| Opened: | Daniel Schwer 17:27 May 26, 2006 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | May 27, 2006 |
| 42606 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (18 %) |