ENS 41510: Difference between revisions
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ENS Event | |
|---|---|
22:00 Mar 21, 2005 | |
| Title | Hpci Declared Inoperable - Entering 14 Day Lco Action Statement |
| Event Description | The following information was provided by the licensee by fax.
At approximately 17:00 on March 21, 2005, while performing required surveillance testing on the Unit 3 HPCI system, the HPCI Condensate Storage Tank (CST) suction valve (MO-3-23-17) failed to close after the HPCI Torus suction valves (MO-3-23-57 & MO-3-23-58) were full open. Failure of the CST suction valve MO-3-23-17 to close when a Torus suction path was established, required entry into Technical Specification 3.3.5.1 for loss of initiation function for CST level low and Torus level high (Functions 3d, 3e). The loss of initiation function under Technical Specification 3.3.5.1 required that the HPCI system be declared inoperable in one (1) hour after discovery. HPCI was initially declared inoperable at 16:41 for surveillance testing. HPCI inoperability has been maintained as of that time. Pursuant to 10CFR 50.72(b)(3), this notification is being made due to Unit 3 HPCI inoperability, which prevents fulfillment of a Safety Function. Initial troubleshooting hints that the cause of the failure may be due to a limit switch malfunction. The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Peach Bottom  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+0.57 h0.0238 days <br />0.00339 weeks <br />7.80786e-4 months <br />) | |
| Opened: | Bill Dalton 22:34 Mar 21, 2005 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Mar 21, 2005 |
| 41510 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |