WRONG TRAIN OF EMERGENCY CORE COOLING SYSTEM REMOVED FROM SERVICE
| Power Reactor | Event Number: 45628 |
| Facility: SAN ONOFRE Region: 4 State: CA Unit: [ ] [ ] [3] RX Type: [1] W-3-LP,[2] CE,[3] CE NRC Notified By: LEE KELLY HQ OPS Officer: PETE SNYDER |
Notification Date: 01/13/2010 Notification Time: 22:43 [ET] Event Date: 01/13/2010 Event Time: 11:25 [PST] Last Update Date: 01/13/2010 |
| Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(3)(v)(D) – ACCIDENT MITIGATION |
Person (Organization): BOB HAGAR (R4DO) |
| Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
| 3 | N | Y | 100 | Power Operation | 100 | Power Operation |
Event Text
| WRONG TRAIN OF EMERGENCY CORE COOLING SYSTEM REMOVED FROM SERVICE “On January 13, 2010, at about 1125 PST, Train A suction piping from the SONGS Unit 3 Refueling Water Storage Tank (RWST) was determined to be inoperable following detection of weld flaw indications during ultrasonic testing. Due to miscommunication, operators mistakenly declared the Train B Emergency Core Cooling System (ECCS) header inoperable at about 1125 and removed DC control power to the Train B ECCS pumps. This resulted in both trains of Unit 3 ECCS being inoperable and entry into the Technical Specification (TS) 3.0.3 one-hour shut down action. At 1140 PST, the DC control power was restored to the Train B ECCS pumps, Train B ECCS was declared operable, and TS 3.0.3 was exited. SCE is reporting this in accordance with 10 CFR 50.72(b)(3)(v) as an event that could have prevented the fulfillment of a safety function.
“SCE is further evaluating the indications found on Train A piping to determine if the piping is capable of performing its safety function. At the time of this occurrence, Unit 2 was in a Steam Generator Replacement Outage, and Unit 3 was at approximately 100% power.” The licensee notified the NRC Resident Inspector. |
