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| Entered date | Event description | |
|---|---|---|
| ENS 52435 | 15 December 2016 06:55:00 | 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). |
| ENS 48849 | 25 March 2013 19:21:00 | 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. On March 25, 2013, at 10:30, Mountain Standard Time, Palo Verde Nuclear Generating Station (PVNGS) removed Alert Notification System (ANS) Siren 22 from service for planned maintenance. Siren 22 provides notification to approximately 1455 members of the public within five miles of PVNGS. Siren 22 is expected to be returned to service on March 27, 2013. County authorities have been notified of this planned maintenance activity and appropriate contingency measures have been established to compensate for the non-functional siren. The PVNGS Emergency Plan contains contingencies for notification of members of the public within the affected area during an emergency when a siren is out of service. There are no events in progress that require ANS operation. The NRC Resident Inspector and the Maricopa County Sheriff's Office have been notified. |