ENS 42534
ENS Event | |
|---|---|
00:29 Apr 28, 2006 | |
| Title | Two Trains of Shield Building Ventilation Inoperable |
| Event Description | At 19:29 on 04/27/2006 the Kewaunee Power Station declared two trains of Shield Building Ventilation (SBV) inoperable. Train B SBV was declared inoperable on 4/25/2006 at 17:25 when SW Train B was declared out of service for a leak that developed on the branch header to Diesel Generator B and TS 3.3.e.2 was entered. On 4/27/2006 at 19:29 QA typing discrepancies in RR-119 were discovered. QA-2 components were used in a QA-1 system, which could potentially cause a failure of some safety related equipment powered from this relay rack. As a result, all safety related equipment powered from RR-119 were declared inoperable and the appropriate technical specifications entered. SBV Train A Damper Control is powered from RR-119 and was declared inoperable at 19:29 on 4/27/2006 resulting in two trains of SBV being inoperable and TS 3.6.c.1 entered. The QA-2 components that may have an adverse affect on QA-1 safety related components in RR-119 have been removed and both trains of SBV were declared operable at 00:29 on 4/28/2006.
The licensee notified the NRC Resident Inspector.
This event was reported on April 27, 2006 (Event Number 42534) for two trains of shield building ventilation (SBV) being declared inoperable. Train B SBV was declared inoperable due to loss of the service water spray system for the SBV charcoal filters and Train A SBV was declared inoperable due to relay rack RR-119 Quality Assurance typing discrepancies (relay rack provides power for SBV Damper Control). Subsequent review of analysis determined that the SBV spray system is not required for post-LOCA operation to control the release of radioactive material. Therefore, Train B of SBV was not required to be declared inoperable when Train B service water was declared out of service. With only one Train of SBV being inoperable, this event is not reportable and is being retracted. The licensee notified the NRC Resident Inspector. Notified R3DO (P. Louden). |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| Time - Person (Reporting Time:+2.93 h0.122 days <br />0.0174 weeks <br />0.00401 months <br />) | |
| Opened: | Joel Stodola 03:25 Apr 28, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Jun 16, 2006 |
| 42534 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Intermediate Shutdown (0 %) |
| After | Intermediate Shutdown (0 %) |
WEEKMONTHYEARENS 479052012-05-08T04:57:0008 May 2012 04:57:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pressure Boundary Leakage ENS 425342006-04-28T00:29:00028 April 2006 00:29:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Two Trains of Shield Building Ventilation Inoperable 2012-05-08T04:57:00 | |