ENS 46303
ENS Event | |
|---|---|
13:51 Oct 1, 2010 | |
| Title | High Head Safety Injection Reduced Capability |
| Event Description | This is an eight-hour non-emergency notification to the NRCOC for a condition that could have prevented the fulfillment of safety function of a system required to mitigate the consequences of an accident in accordance with 10 CFR 50.72(b)(3)(v)(D).
Unit 4 High Head Safety Injection (SI) system was at reduced capability from approximately 0951[hrs. EDT] to 1027 [hrs.]. This was due to an open flowpath from the High Head Safely Injection Pump discharge to the Unit 3 Reactor Coolant System (RCS) and refueling cavity. This flow path was established during the execution of an Equipment Clearance Order for Unit 3 SI system when SI valves MOV-3-843A and MOV-3-843B were opened prior to closing SI lsolation Valve 3-867. This condition could have impacted the ability of the SI pumps to provide required flow to the RCS cold legs should the SI system have been required based on Engineering judgment. This condition was discovered at approximately 1005 [hrs.]. Unit 3 is in Mode 6 for a planned refueling outage. Unit 4 is in Mode 1 at 100% Unit 3 and Unit 4 share a common High Head SI System discharge header. Unit 4 entered T.S. 3.0.3 from 0951[hrs.] to 1027 [hrs.] when SI Isolation Valve 3-867 was closed. The licensee has notified NRC Resident Inspector. |
| Where | |
|---|---|
Turkey Point  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000251/LER-2010-007 |
| Time - Person (Reporting Time:+4.08 h0.17 days <br />0.0243 weeks <br />0.00559 months <br />) | |
| Opened: | Michael Coen 17:56 Oct 1, 2010 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Oct 1, 2010 |
| 46303 - NRC Website
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Unit 4 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |