ENS 54994
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ENS Event | |
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18:11 Nov 11, 2020 | |
Title | Notification of Steam Generator Tube Degradation |
Event Description | At 1311 EST on November 11, 2020, it was determined, after evaluation of the Watts Bar Nuclear Plant (WBN) Unit 2 Steam Generator (SG) tube eddy current test data collected during the on-going refueling outage, that the WBN Unit 2 Reactor Coolant System pressure boundary did not meet the performance criteria for SG tube structural integrity. Specifically, SG number 3 failed the condition monitoring assessment for conditional burst probability. WBN has completed tube plugging and additional corrective actions are in progress. This event is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(ii)(A).
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
Where | |
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Watts Bar ![]() Tennessee (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
Time - Person (Reporting Time:+-2 h-0.0833 days <br />-0.0119 weeks <br />-0.00274 months <br />) | |
Opened: | Ryan Nessell 16:11 Nov 11, 2020 |
NRC Officer: | Brian P. Smith |
Last Updated: | Nov 11, 2020 |
54994 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Cold Shutdown (0 %) |
After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 549942020-11-11T18:11:00011 November 2020 18:11:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Notification of Steam Generator Tube Degradation ENS 427462006-08-01T07:35:0001 August 2006 07:35:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Rcs Pressure Boundary Leakage ENS 421402005-11-14T16:41:00014 November 2005 16:41:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Cladding Failure to One Spent Fuel Rod Found During Inspection of Spent Fuel in the Spent Fuel Pool 2020-11-11T18:11:00 | |
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