ENS Event | |
|---|---|
03:54 Nov 6, 2008 | |
| Title | Both Trains of Control Room Emergency Air Temperature Control Declared Inop |
| Event Description | WBN Unit 1 initiated a Tech Spec required shutdown at 2254 on 11/05/08. The plant entered TS 3.0.3 at 2135 on 11/05/08 due to both trains of Control Room Emergency Air Temperature Control (CREATCS) being declared inoperable. Initially Train 'B' CREATCS was inoperable due to the scheduled maintenance of Train 'B' auxiliary air system. With one train of Aux Air inoperable this renders that respective train of CREATCS inoperable. During this planned maintenance the 'A' train CREATCS chiller lost ability to cool the Main Control Room due to a failure in the control circuitry. This rendered 'A' train inoperable which led to entry into TS 3.0.3 for both trains CREATCS being inoperable. The plant exited TS 3.0.3 at 2345 on 11/05/08 upon completion of Post Maintenance Testing on the train 'B' Aux Air system and return to operability of the 'B' train Aux Air and therefore the 'B' train of CREATCS. The planned plant shutdown was stopped upon exit of TS 3.0.3 at 2345 11/05/08 and Rx power restored to 100%.
The licensee notified the NRC Resident Inspector |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-2.92 h-0.122 days <br />-0.0174 weeks <br />-0.004 months <br />) | |
| Opened: | Billy Johnson 00:59 Nov 6, 2008 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Nov 6, 2008 |
| 44632 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 446322008-11-06T03:54:0006 November 2008 03:54:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Both Trains of Control Room Emergency Air Temperature Control Declared Inop ENS 443632008-07-24T19:02:00024 July 2008 19:02:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Loss of Essential Raw Cooling Water Pump with 2 Edg'S Oos 2008-07-24T19:02:00 | |