ENS 51522
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ENS Event | |
|---|---|
12:47 Nov 9, 2015 | |
| Title | Unusual Event Declared Due To Containment Fire Alarm |
| Event Description | The following event description is based on information currently available. If through subsequent reviews of this event additional information is identified that is pertinent to this event or alters the information being provided at this time a follow-up notification will be made via the ENS or under the reporting requirements of 10 CFR 50.73.
During Palo Verde Nuclear Generating Station Unit 2 containment pressurization for integrated leak rate testing in Mode 5, a containment fire alarm in Fire Zone 63B (Steam Generator 2 all elevations of containment) was received. Containment temperature and pressure at time of event were 72 degrees F and 13 PSIG. Due to the inability to access containment to validate the fire alarm, an Unusual Event (HU2.1) was declared at 0547 [MST] for a Fire in containment which was unable to be validated within 15 minutes of receipt. No safety functions have been impacted due to the fire alarm. No automatic or manual RPS or ESF actuations occurred and none were required. Actions are being taken to depressurize containment to enter and validate the fire alarm. The NRC Resident Inspector has been notified. There has been no effect on U-1 or U-3 due to this fire alarm. Notified DHS SWO, FEMA Ops Center, NICC Watch Officer and via E-mail only FEMA NWC and Nuclear SSA.
Containment was entered following depressurization. Operations and Fire Protection personnel inspection of containment and Fire Zone 63B identified no indication of fire or smoke and the fire alarm was determined to be invalid. No other impacts to plant equipment were identified. The Unusual Event was terminated on 11/9/2015 at 0901 MST. The NRC Resident Inspector has been notified. Notified R4DO (Proulx), NRR EO (Morris), and IRD (Grant). Notified DHS SWO, FEMA Ops Center, NICC Watch Officer and via E-mail only FEMA NWC and Nuclear SSA. |
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.12 h-0.172 days <br />-0.0245 weeks <br />-0.00564 months <br />) | |
| Opened: | C. R. Orozco 08:40 Nov 9, 2015 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Nov 9, 2015 |
| 51522 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 570662024-04-04T23:18:0004 April 2024 23:18:00
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