ENS 44206
ENS Event | |
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12:25 May 13, 2008 | |
Title | Unusual Event Declared Due to Loss of Offsite Power |
Event Description | At 0806 EDT, a loss of offsite power occurred when the 115 KV line #4 was lost combined with the unavailability of 115 KV line #1 which was out of service at the time for planned maintenance. Both EDGs started and loaded on the safety busses as expected. The licensee declared an Unusual Event at 0825 EDT per EAL 6.1.1 based on loss of offsite power for greater than 15 minutes.
The Unit 1 recirc pump #13 tripped as a result of the event and spent fuel pool cooling was also lost. The licensee remained at power and there was no impact on Nine Mile Unit 2. Power for 115 KV line #1 was restored at 0845 EDT. Cause of the loss of Line #4 is still under investigation. The reactor is stable and the safety busses continue to be power by the EDGs. Restoration of a normal electrical power lineup and termination of the UE is still under review. The licensee notified the NRC Resident Inspector, the State, and local authorities.
The licensee terminated the Unusual Event at 10:22 EDT based on restoration of offsite power to safety bus 103 from line #1. Bus 102 still remains energized by the EDG at this time. Investigation into the loss of line #4 continues. The loss of line #4 has been attributed to a Fitzpatrick protective relay 87B actuation for the B phase differential current. Investigation continues. The NRC Resident has been notified by the licensee. NRR EO (Thorp), Rg 1 (Dentel), IRD (McDermott), R1DO (Krohn), DHS (Dwight) and FEMA (McKentry) notified.
This condition is also reportable under 10 CFR 50.72(b)(3)(v)(D) 'Any event or condition that at the time of discovery could have prevented fulfillment of a safety function of systems that are needed to mitigate the consequences of an accident.' Specifically, both offsite power 115 KV lines were not available. The second paragraph which applies is 10 CFR 50.72(b)(3)(iv)(B) 'Any event or condition that results in the valid actuation of the systems listed in paragraph (b)(3)(iv)(B).' Specifically, the auto start of the Emergency Diesel Generators on a valid loss of offsite power signal. The cause of the loss of line 4 is still being investigated. Offsite power has been restored to onsite buses including PB 102, 103 and 101. The licensee will notify the NRC Resident Inspector of this update. Notified R1DO (Krohn). |
Where | |
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Nine Mile Point New York (NRC Region 1) | |
Reporting | |
Emergency class: | Unusual Event |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(3)(iv)(A), System Actuation 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-3.43 h-0.143 days <br />-0.0204 weeks <br />-0.0047 months <br />) | |
Opened: | Jerry Helker 08:59 May 13, 2008 |
NRC Officer: | Bill Huffman |
Last Updated: | May 13, 2008 |
44206 - NRC Website | |
Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (92 %) |
Nine Mile Point with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 570042024-03-04T00:42:0004 March 2024 00:42:00
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Mitigate the Consequences of an Accident Unplanned Inoperability of the High Pressure Core Spray System ENS 449822009-04-10T09:38:00010 April 2009 09:38:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation High Pressure Coolant Injection Automatic Initiation Due to Turbine Trip ENS 449232009-03-21T05:21:00021 March 2009 05:21:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation High Pressure Coolant Injection System Initiation Following Planned Manual Scram ENS 445982008-10-24T01:26:00024 October 2008 01:26:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to Loss of the Electronic Pressure Regulator ENS 442062008-05-13T12:25:00013 May 2008 12:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Loss of Offsite Power ENS 436522007-09-19T19:04:00019 September 2007 19:04:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to Inadvertent Discharge of Co2 Into Switchgear Room ENS 426332006-06-12T17:02:00012 June 2006 17:02:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Hpci Inititation Signal Due to Turbine Trip Signal During Startup ENS 419272005-08-18T13:49:00018 August 2005 13:49:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Scram Due to Loss of a Power Board ENS 415842005-04-10T10:00:00010 April 2005 10:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Scram Signal Resulting from Failure of a Supply Valve to the Scram Air Header ENS 409982004-08-30T12:35:00030 August 2004 12:35:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Manually Scrammed Due to Oscillating Reactor Vessel Water Level ENS 409202004-08-03T14:46:0003 August 2004 14:46:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Rendered Inoperable Due to Faulty Test Equipment ENS 407192004-05-02T06:17:0002 May 2004 06:17:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Manual Scram Due to Rising Torus Temperature Due to Stuck Open Erv ENS 406842004-04-18T22:30:00018 April 2004 22:30:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Residual Heat Removal System Isolation Due to a Rise in Reactor Pressure ENS 405062004-02-05T18:40:0005 February 2004 18:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Emergency Diesel Generator Ventilation Exhaust Damper Covered with Snow and Ice ENS 404782004-01-26T14:41:00026 January 2004 14:41:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event (Transitory) Due to Low Intake Bay Level Caused by Icing ENS 403222003-11-14T02:49:00014 November 2003 02:49:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of 115 Kv Line Results in Emergency Diesel Generator Auto-Start ENS 400662003-08-14T21:00:00014 August 2003 21:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Noue Was Declared at 1700 Due to Loss of Offsite Power ENS 400712003-08-14T20:35:00014 August 2003 20:35:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Loss of Offsite Power Greater than 15 Minutes. 2024-03-04T00:42:00 | |