ENS Event | |
|---|---|
19:05 Aug 11, 2016 | |
| Title | Robinson Dam Tainter Gates Unanalyzed Condition |
| Event Description | During testing it was discovered that the H. B. Robinson Steam Electric Plant, Unit 2 (RNP) Lake Robinson Dam Tainter Gates A and B were in degraded condition. The Tainter Gates are non-technical specification features of design that control Lake Robinson water level. RNP was not able to achieve full opening of the Tainter Gates. Subsequent analysis has concluded that the degraded condition of the Tainter Gates adversely impacts their UFSAR credited safety function. On 8/11/2016, at 1505 EDT, it was determined this places RNP in an unanalyzed condition that significantly degrades plant safety [per] 10 CFR 50.72 (b)(3)(ii)(B). The Tainter Gates have been repaired, tested and rendered complaint with their original licensing basis function. The current plant status does not pose undue risk to the health and safety of the public.
The NRC Senior Resident Inspector has been notified of this condition. |
| Where | |
|---|---|
Robinson  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />) | |
| Opened: | Nick Roh 18:41 Aug 11, 2016 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Aug 11, 2016 |
| 52174 - NRC Website
Loading map... | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 521742016-08-11T19:05:00011 August 2016 19:05:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Robinson Dam Tainter Gates Unanalyzed Condition ENS 518642016-04-13T18:30:00013 April 2016 18:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition ENS 507782015-01-29T00:57:00029 January 2015 00:57:00 Other Unspec Reqmnt, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Safety System Will Not Function as Required ENS 406172004-03-28T15:26:00028 March 2004 15:26:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Both Trains of High Pressure Safety Injection Inoperable for 25 Minutes 2016-08-11T19:05:00 | |