ENS 43186
ENS Event | |
|---|---|
18:00 Feb 25, 2007 | |
| Title | Degraded Electrical Cables to Ccw System |
| Event Description | 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.
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). |
| Where | |
|---|---|
Palisades  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+-0.18 h-0.0075 days <br />-0.00107 weeks <br />-2.46564e-4 months <br />) | |
| Opened: | Michael Kane 17:49 Feb 25, 2007 |
| NRC Officer: | John Knoke |
| Last Updated: | Sep 14, 2007 |
| 43186 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 526472017-03-29T19:08:00029 March 2017 19:08:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Discovery of Non-Conforming Conditions During Tornado Hazards Analysis ENS 431862007-02-25T18:00:00025 February 2007 18:00:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Degraded Electrical Cables to Ccw System 2017-03-29T19:08:00 | |