ENS 52435
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ENS Event | |
|---|---|
11:10 Dec 15, 2016 | |
| Title | Alert Declared - Catastrophic Failure of an Emergency Diesel Generator |
| 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 10CFR50.73.
During a scheduled surveillance test run of the PVNGS [Palo Verde Nuclear Generating Station] Unit 3 'B' Train Emergency Diesel Generator, there was a catastrophic failure of a piston to include crankcase damage and diesel trip. The Emergency Plan has been entered and an ALERT was declared at 0410 [MST] on 12/15/16 based on an explosion resulting in visible damage to a safety system required for safe shutdown. The cause of the failure is unknown at this time. PVNGS Fire Department responded and no fire was observed. Unit 3 remains on line at 100% power. No other safety functions are impacted. No personnel injuries occurred. The unit is in a ten day technical specification on an emergency diesel generator being inoperable. The licensee notified the NRC Resident Inspector. Notified DHS, DOE, EPA, FEMA, NICC, USDA, HHS, FDA, NSSA, Mexico, and OIP (Skeen).
This serves as the notification of the termination of Alert HA2.1 declared at 0410 MST at Palo Verde Nuclear Generation Station. The event terminated at 0636 MST. The licensee will notify the NRC Resident Inspector. Notified R4DO (Keller), NRR EO (Miller), IRD (Stapleton), DHS, DOE, EPA, FEMA, NICC, USDA, HHS, FDA, NSSA, Mexico, and OIP (Skeen). |
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| Emergency class: | Alert |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| LER: | 05000530/LER-1916-002-01 Regarding Emergency Diesel Generator Failure Resulting in a Condition Prohibited by Technical Specifications |
| Time - Person (Reporting Time:+-4.25 h-0.177 days <br />-0.0253 weeks <br />-0.00582 months <br />) | |
| Opened: | Andrew Liston 06:55 Dec 15, 2016 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 15, 2016 |
| 52435 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 576592025-04-10T14:11:00010 April 2025 14:11:00
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