ENS 52132
ENS Event | |
|---|---|
01:20 Jul 29, 2016 | |
| Title | Postulated Fire Event That Could Adversely Impact Safe Shutdown Equipment |
| Event Description | A review of the Beaver Valley Unit 2 Fire Protection Safe Shutdown Report (FPSSR) found that a postulated fire had the potential to spuriously open all three individual steam generator atmospheric dump valves in addition to a common residual heat release valve. Previous analysis did not consider all of the valves spuriously opening from a fire. The potential impact of these valves spuriously opening is a cooldown that could adversely affect shutdown margin.
Hourly fire tours have been put in place for those fire areas that have the potential to initiate this condition. This condition is reportable as an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> report in accordance with 10 CFR 50.72(b)(3)(ii)(B). The NRC Resident Inspector was notified. This condition is not applicable to Unit 1.
Retraction of EN 52132 'Postulated Fire Event That Could Adversely Impact Safe Shutdown Equipment'. On 07/29/2016, an 8-hour notification (EN 52132) was made describing the discovery of a postulated fire event that could adversely impact safe shutdown equipment, specifically the spurious opening of the three Atmospheric Steam Dump Valves (ASDVs) and the Residual Heat Release (RHR) Valve, simultaneously. This notification was made pursuant to 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition because of the potential effect on shutdown margin. Further engineering evaluation has determined that the required shutdown margin is not challenged by the event, as bounded by previous analysis of a similar scenario as well as validated operator actions. Therefore, this does not result in a reportable condition. The Resident NRC Inspector has been notified. Notified the R1DO (Cook). |
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+0.52 h0.0217 days <br />0.0031 weeks <br />7.12296e-4 months <br />) | |
| Opened: | Ken Tiefenthal 01:51 Jul 29, 2016 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Sep 26, 2016 |
| 52132 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |