Semantic search
Jump to navigation
Jump to search
| Entered date | Event description | |
|---|---|---|
| ENS 40733 | 7 May 2004 15:42:00 | The following information was obtained from the licensee via facsimile: On 03/21/04 at 12:32 hours (EST), a JLG Manlift working on the Unit 1 Cooling Tower came into contact with a 230 KV transmission line, causing the loss of one of two off-site power supplies to the plant (Startup Transformer T-10 and its associated loads). The other Startup Transformer (T-20) assumed the extra electrical load, as designed, and restored power to the station. At the time of this event, Unit 1 was in Mode 5 and Unit 2 was in Mode 1. Both Units continued in Modes 5 and 1, respectively. As a result of the loss of the T-10 transformer, the following Unit 2 Primary Containment Isolation (Valves)(PCIVs) closed on loss of logic power: Containment Atmosphere Control PCIVs HV-25740A, HV-25750A, HV-25776A, HV25780A, HV-25736A, and HV-25742A, HV-25752A, HV-25774A, HV-25782A, HV-25734A. Drywell Sump PCIVs HV-261108 A1 and A2 closed. Reactor Building Chilled Water PCIVs HV-28791 A1 and A2 and HV-28792 A1 and A2 closed. Recirculation Sample PCIV HV-243F019 closed. All isolation signals were successfully reset and the T-10 line was subsequently restored. The Unit 2 electrical transient event resulted in general containment isolation signals affecting containment isolation valves in more than one system and is therefore being reported per 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A). A voluntary ENS Phone Notification to the NRC, related to this event, was previously made on 03/21/04, due to notification of the Pennsylvania Emergency Management Agency (PEMA), because an emergency vehicle entered plant property. The above listed systems' Division 1 containment isolation valve actuations were completed and functioned successfully on loss of logic power. The licensee has informed the NRC Resident Inspector of this notification. |