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| Entered date | Event description | |
|---|---|---|
| ENS 42959 | 2 November 2006 19:10:00 | At 1436 hours on November 2, 2006, with the plant in Mode 3, it was determined that less than 100% of the required Emergency Core Cooling System (ECCS) flow was available per Technical Specification (TS) 3.5.2.D. Therefore, TS LCO 3.0.3 was entered. Each High Pressure Safety Injection (HPSI) pump (one in each ECCS train) is designed with alignment blocks in its mounting, which ensures pump and motor alignment for the thermal expansion experienced by the pump upon initiation of sump recirculation flow. These alignment blocks ( 2 per pump) were discovered to be improperly installed, or missing altogether. In this condition, the HPSI pump could potentially be rendered inoperable upon initiation of sump recirculation. This condition is reportable in accordance with 10CFR 50.72(b)(3)(ii)(B) and (b)(3)(v)(D) as an unanalyzed condition, and a condition that could have prevented the fulfillment of the safety function of the HPSI pumps to mitigate the consequences of an accident, respectively. The NRC Resident Inspector was notified of this event by the licensee.
EN # 42959 reported on November 2, 2006 that both Emergency Core Cooling System Trains were inoperable. The reason for that determination involved the observation that the alignment blocks (keys) associated with the mounting of the high pressure safety injection (HPSI) pumps were either incorrectly installed or were missing. The alignment keys were believed to be necessary to ensure appropriate HPSI pump and motor alignment for the thermal expansion experienced upon initiation of sump recirculation flow. The condition was reported as an unanalyzed condition and a condition that could have prevented the fulfillment of the safety function of the HPSI pumps to mitigate the consequences of an accident. Subsequently, further evaluation of the HPSI pump mounting configuration determined that the alignment keys are not required for pump operability. Therefore, there was no unanalyzed condition and no condition that could have prevented the fulfillment of the safety function of the HPSI pumps to mitigate the consequences of an accident. The licensee notified the NRC Resident Inspector. R3DO(Cameron) notified. |
| ENS 42954 | 1 November 2006 18:40:00 | On November 1, 2006, at 1530 hours EST, a service water leak was identified in the cooling coil of Containment Air Cooler VHX-4. While this containment air cooler has no safety function for containment cooling, the breached cooling coil represents an inoperable containment boundary. In accordance with Technical Specification (T.S.) 3.6.1.B1&2, a shutdown was initiated at 1805 hours EST, following expiration of the completion time of 1 hour for restoring containment to operable per T.S. 3.6.1.A.1. The licensee anticipates having the unit in mode 3 Hot Standby by 2205 hours EST, at which time an evaluation involving extent of condition for the required repairs will be performed. The leak is characterized at this time as 300 ml/minute. The licensee informed the NRC Resident Inspector. |