ENS 43002
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ENS Event | |
|---|---|
11:15 Nov 21, 2006 | |
| Title | Unusual Event Declared Due to Unidentified Leakage |
| Event Description | Licensee reported 20 GPM of unidentified leakage from indication of VCT lowering level. RCS pressure is 50 psig. Source of the leak has not been identified and it is not known at this time where the RCS leakage is going. All air and liquid releases are within specifications and no protective action recommendations are needed at this time.
The licensee has notified the State and Local emergency agencies. The licensee will notify the NRC Resident Inspector.
Unidentified leakage is now calculated to be 2 GPM based on inventory balance using charging and letdown flow and VCT level. It is believed that the indication of a leak may be from an incomplete vacuum fill of the S/G after the S/G replacement modification and when the RCS was pressurized, the remaining voids in the S/Gs were filled. There has been no visible leakage found outside of the RCS. Notified NRREO (Wermiel), R2DO (Haag), IRD Manager (Wilson / Leach).
The licensee terminated the Unusual Event (UE) at 0737 due to indicated RCS leakage being less than 2 GPM. The site's emergency action criteria for a UE is 10 GPM unidentified leakage. No water has been found to have leaked outside the RCS. The licensee notified the NRC Resident Inspector. Notified NRREO (Wermiel, Ross-Lee), R2DO (Haag), IRD Manager (Wilson, Leach), DHS SWO (Gray), FEMA (LaForty)
The cause of the apparent leakage is under investigation by plant and TVA personnel. No actual leakage is believed to have transpired. Current plant conditions are stable. The licensee notified the NRC Resident Inspector. Notified R2DO (Haag), NRREO (Ross-Lee), IRD Manager (Wilson)
As a result of the declaration of a Notification of Unusual Event earlier today relative to a suspected RCS leak, a News Release is being made. The purpose of the release is to clarify to local officials and residents the nature of the suspected leak and the actions taken by school officials. The cause of the suspected leak remains under investigation. The licensee notified the NRC Resident Inspector. Notified R2DO (Haag). |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-4.73 h-0.197 days <br />-0.0282 weeks <br />-0.00648 months <br />) | |
| Opened: | Ben Hunt 06:31 Nov 21, 2006 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Nov 21, 2006 |
| 43002 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
Watts Bar with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 568502023-11-12T08:00:00012 November 2023 08:00:00
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ENS 464692010-12-06T13:15:0006 December 2010 13:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Osha Contacted Due to Fatality of Contractor Employee ENS 464482010-12-02T21:10:0002 December 2010 21:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Individual Contamination ENS 430022006-11-21T11:15:00021 November 2006 11:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Unidentified Leakage ENS 414002005-02-10T22:01:00010 February 2005 22:01:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Tritium Sample Exceeding Offsite Dose Calculation Manual (Odcm) Reporting Level ENS 410492004-09-17T09:00:00017 September 2004 09:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Capability and Notification of Offsite Agency 2023-11-12T08:00:00 | |
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