ENS 42533
ENS Event | |
|---|---|
03:30 Apr 28, 2006 | |
| Title | Both Safety Injection Trains Declared Inoperable |
| Event Description | At 22:30 on 04/27/2006 the Kewaunee Power Station declared both trains of Safety Injection (SI) inoperable. SI Pumps A & B were declared out of service per Surveillance Procedure SP 87-125 (Shift Instrument Channel Checks-Operating) due to SI Accumulator B level change of greater than or equal to 3%. SI Accumulator B level indicator (LI-935) indicated 30%. Previous indication recorded for SI Accumulator B was 33%. Per SP-87-125 'If the SI pumps are not vented prior to a level decrease of greater than or equal to 3%, the SI pumps become INOPERABLE.' TS 3.0.c (Standard Shutdown Sequence) was entered. At 0130 on 4/28/2006, venting of both SI Pumps was completed. SI Pump A was returned to service and SI Pump B remains out of service due to SW Train B inoperability.
The licensee notified the NRC Resident Inspector.
On 4/28/06, with Train B of SI already inoperable for other reasons, EN#42533 was made under 10CFR 50.72(b)(3)(ii)(B) for both trains of Safety Injection (SI) being inoperable due to excessive level drop in an SI Accumulator which had the potential to gas-bind both trains. Subsequent evaluation has determined that, under the existing plant conditions, an SI train should only be declared inoperable if it is found that gas is actually present in the SI pump. Since venting after the event revealed no gas present, neither SI train was rendered inoperable by the Accumulator level drop, and thus both trains were never inoperable. Therefore, EN#42533 is being retracted. The licensee will notify the NRC Resident Inspector. Notified R3DO (K. O'Brien) |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.17 h-0.00708 days <br />-0.00101 weeks <br />-2.32866e-4 months <br />) | |
| Opened: | Joel Stodola 03:20 Apr 28, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Jun 21, 2006 |
| 42533 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Intermediate Shutdown (0 %) |
| After | Intermediate Shutdown (0 %) |