Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 47902 | 7 May 2012 16:16:00 | This event is being reported in accordance with 10 CFR 50.72(b)(2)(xi). On May 7, 2012, at approximately 1233 hours (EDT), an inadvertent actuation of the Perry Nuclear Power Plant's alert notification system occurred. Twenty of the seventy-six total sirens sounded for three minutes affecting Ashtabula, Geauga, and Lake Counties. Following the actuation the county agencies received calls from members of the public. A successful quiet test of the sirens had been conducted earlier in the day (at approximately 0830 hours (EDT)). At this time, all sirens are functioning correctly. The siren actuation was not related to any condition or event at the Perry Nuclear Power Plant. The actuation signal originated from the Lake County Emergency Operations Center while thunderstorms were passing through the area. Additional investigation is in progress to determine the cause of the inadvertent actuation. At the time of the event, the plant was in Mode 1 at 100 percent rated thermal power. Lake County officials plant to issue a press release. The NRC Resident Inspector has been notified. |
| ENS 45591 | 25 December 2009 19:18:00 | EMERGENCY RESPONSE DATA SYSTEM OUT OF SERVICE On December 25, 2009, at approximately 1540 hours EST, the plant computer system (ICS) experienced a lockup due to a loss of electrical power to the meteorological tower. This resulted in a loss of most Emergency Response Data System (ERDS) information points, the Safety Parameter Display System (SPDS), and the automatic mode calculation of the Computer Aided Dose Assessment Program (CADAP). The Computer Aided Dose Assessment Program remained available in manual data entry mode. At 1758 hours, the ICS computer system operation was restored to normal. All SPDS and ERDS information points are now functioning properly. Power restoration activities to the meteorological tower are in progress. This event is being reported in accordance with 10 CFR 50.72(b)(3)(xiii) as a condition that results in a major loss of emergency offsite communications capability. The NRC Resident Inspector has been notified." |
| ENS 44905 | 13 March 2009 00:42:00 | The Perry Nuclear Power Plant has taken a portion of the Plant Computer out of service for scheduled maintenance. This has resulted in a portion of ERDS being out of service. From 0025 hours EDT on March 13, 2009 for approximately 36 hours, personnel will be performing maintenance activities which result in a partial loss of the Plant Computer. During this planned maintenance, portions of the Safety Parameter Display System (SPDS) and the automatic mode calculation of the Computer Aided Dose Assessment Program (CADAP) will be unavailable. In the event of an emergency, plant parameter data will be orally transmitted to the facilities through the Status Board Ring Down circuit with back-up by the Private Branch Exchange, Off Premise Exchange, and various redundant intra-facility circuits throughout the emergency facilities. The dose assessment function will be maintained during the out of service time period by manual input of data into CADAP and, if required, by manual calculation. The ability to open and maintain an 'open line' using the Emergency Notification System will not be affected and will be the primary means of transferring plant data to the NRC as a contingency until the ERDS can be returned to service during the period of unavailability. This event is being reported in accordance with 10CFR50.72(b)(3)(xiii), as a condition that results in a major loss of offsite communication capability. A follow-up notification will be made when the maintenance activities are completed and the equipment is restored. The licensee notified the NRC Resident Inspector.
The plant has extended the expected plant computer outage time by 60 hours (ending 3/16/2009 at 2400). Notified the R3DO (Lara).
The licensee has extended the expected outage time for the plant computer maintenance by an additional 24 hours. Repairs are now expected to be completed by 2400 EDT on 3/17/09. The licensee will notify the NRC Resident Inspector. R3DO(Ring) notified.
The licensee states that that the plant computer and all associated functions (SPDS, CADAP, and ERDS) were returned to service at 1313 EDT on 3/17/09. The licensee has notified the NRC Resident Inspector. R3DO(Ring) notified. |