ENS 43392
ENS Event | |
|---|---|
06:00 May 28, 2007 | |
| Title | Hpci Pump Inoperable Due to Differential Pressure Setting Not within Specification |
| Event Description | On 5/28/07 at 0100 CDT, Browns Ferry Unit 1 was performing 1-SR-3.5.1.7 (Comp) HPCI Comprehensive pump test when it was determined that HPCI pump set differential pressure was not within specifications and therefore would not support a declaration of operability for HPCI.
The event is reportable under 10CFR 50.72(b)(3)(v)(B) - 'any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat' and 10CFR 50.72(b)(3)(v)(D) - 'any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident'. This event also requires a 60 day written report in accordance with 10CFR 50.72(b)(3)(v)(B) and 10CFR50.73(a)(2)(v)(D). Initial investigation reveals a potential problem with the test equipment. The licensee notified the NRC Resident Inspector.
This report is being retracted. Engineering has re-evaluated the test results and determined that HPCI System pump met its design basis requirements during testing activities. As such, the circumstance discussed in this event report did not result in any condition that could have prevented the fulfillment of the safety function of structures or systems needed to mitigate the consequences of an accident. Therefore, this event is not reportable under 10CFR50.72(b)(3)(v)(B) or 10CFR50.72(b)(3)(v)(D). The licensee notified the NRC Resident Inspector. R2DO (Ayres) notified. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+2.8 h0.117 days <br />0.0167 weeks <br />0.00384 months <br />) | |
| Opened: | Matthew Rasmussen 08:48 May 28, 2007 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Jun 29, 2007 |
| 43392 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (9 %) |
| After | Power Operation (9 %) |