ENS 46947
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ENS Event | |
|---|---|
12:02 Jun 10, 2011 | |
| Title | All Four Channels Of Rps Overpower Flux/Flow Imbalance Protection Trip Discovered To Be Inoperable |
| Event Description | Event: During startup of Unit 1 on June 10, 2011, after increasing power to approximately 50 percent, it was noticed that power range nuclear instrumentation was not responding adequately to power imbalance differences. At 0802 EDT, all four channels of Reactor Protective System instrumentation were declared inoperable. TS 3.3.1., Reactor Protective System (RPS) instrumentation, Condition A, B, and C were entered. RPS Channel D was placed in trip per Condition A. Trouble shooting efforts were immediately initiated.
Initial Safety Significance: This issue constitutes a loss of safety function because the nuclear overpower flux/flow imbalance trip function of RPS was not operable. Corrective Action(s): Trouble-shooting commenced. A wiring error was identified that affected all four RPS channels. At this time, all four channels have been restored to operability. All conditions of TS 3.3.1, Conditions A, B, and C have been exited as of 1438 EDT hours when all four channels of RPS were restored. The licensee stated that the wiring error is associated with a modification package that was completed during the recent refueling outage. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.88 h0.162 days <br />0.0231 weeks <br />0.00531 months <br />) | |
| Opened: | Sandra Severance 15:55 Jun 10, 2011 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jun 10, 2011 |
| 46947 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (50 %) |
| After | Power Operation (50 %) |
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