On February 17, 2007, it was discovered that cables in a cable tray associated with the Component Cooling Water (
CCW) system and
Service Water system had sustained external damage by the heat effects from an un-insulated pipe that was in close proximity to the cable tray.
On February 25, 2007, at 1100 hrs, as a result of continued evaluation of the cables in the cable tray and the discovery of a cable with unacceptable cable damage, it was determined that all cables located within the cable tray at the effected zone (that were not already isolated or replaced) were inoperable due to the loss of qualification life and the potential for cable-to-cable interaction from degradation of the cable insulation. This condition could potentially result in spurious equipment operation, causing components to be positioned in other than their desired safety position.
Subsequently, on February 25, 2007, at 1300 hrs, it was recognized that a specific combination of two postulated cable faults could affect the CCW system resulting in a condition where there would be less than 100% of the required CCW post accident cooling capability, per Technical Specification (TS) 3.7.7.C. As a result, TS 3.0.3 was entered. At 1322 hrs, TS 3.0.3 was exited, following isolation of one of the two postulated cable faults, which restored the capability for 100% of the required CCW post accident cooling.
The condition of potentially having less than 100% of the required CCW post accident cooling is reportable per 10 CFR 50.72(b)(3)(v)(B) as a condition that could have prevented the fulfillment of the safety function of structures or systems (CCW system) that are needed to remove residual heat.
The licensee notified the NRC Resident Inspector.
- * * RETRACTION PROVIDED BY BARB DOTSON TO JASON KOZAL ON 9/14/07 AT 1523 * * *
EN #43186 reported on February 21, 2007, that cables associated with the component cooling water system had sustained external damage by the heat effects from an uninsulated pipe in close proximity to the cable tray. This was reported as a condition that could have prevented the fulfillment of the safety function of the component cooling water system, which is needed to remove residual heat.
Subsequent evaluation of past operability concluded that these cables would not have failed as postulated, and are considered to have been operable. Therefore, the condition did not prevent fulfillment of a safety function and EN #43186 is being retracted.
The licensee notified the NRC Resident Inspector.
Notified R3DO (S. Burgess).
