ENS 51185
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ENS Event | |
|---|---|
03:35 Jun 27, 2015 | |
| Title | Both Aux Feedwater Trains Declared Inoperable |
| Event Description | On June 26, 2015 at 2335 [EDT], with Auxiliary Feedwater (AFW) train 1 declared inoperable for scheduled surveillance testing, AFW train 2 was declared inoperable as a result of the supply breaker for SW1395, Service Water Loop 2 secondaries isolation valve, being found open, i.e. out of its required position. Limiting Condition for Operation (LCO) 3.7.5 Condition D was entered for two Emergency Feedwater Trains inoperable. AFW Train 1 and the non-safety related motor driven AFW pump were available to provide emergency feedwater if required.
The breaker was verified to be functioning as required and then closed, restoring the safety function. All associated LCOs were exited by 0133 [EDT] on June 27, 2015. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Davis Besse Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| LER: | 05000346/LER-2015-003 Regarding Inadvertent Breaker Operation Renders Control Room Emergency Air Temperature Control System Inoperable |
| Time - Person (Reporting Time:+3.68 h0.153 days <br />0.0219 weeks <br />0.00504 months <br />) | |
| Opened: | Mark Helle 07:16 Jun 27, 2015 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jun 27, 2015 |
| 51185 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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