ENS Event | |
|---|---|
05:00 Oct 3, 2003 | |
| Title | Noncomformance Notification for Solid State Protection Master Relay |
| Event Description | Failure of Master Relay K507 (MidTex Part Number 15614D200) in the Solid State Protection System (SSPS) was attributed to corrosion caused by off-gassing of chlorine contamination from paper used to wrap the relay coil, or the adhesive used to attach the paper wrap to the coil. Master Relays must change state, upon energization, to actuate various safety related equipment in the plant. The failure of Master Relay K507 is considered to be a manufacturing defect in a basic component that could cause a loss of safety function.
The majority of MidTex relays investigated had cloth wrapped coils and these relays showed no evidence of corrosion. The number of affected relays and installed locations was not available at the time of the initial notification. The licensee will notify the NRC Resident Inspector. |
| Where | |
|---|---|
Summer  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+1424.62 h59.359 days <br />8.48 weeks <br />1.951 months <br />) | |
| Opened: | Jeff Pease 14:37 Dec 1, 2003 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Dec 1, 2003 |
| 40364 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 469972011-06-27T20:11:00027 June 2011 20:11:00
[Table view]10 CFR 21.21 Appendix R Analyses Fails to Recognize Hot-Short Failure Resulting in the Loss of an Essential Electrical Bus ENS 430312006-12-04T18:25:0004 December 2006 18:25:00 10 CFR 21.21 Potential Defective Woodward Governor for Fairbanks Morse Edg ENS 403642003-10-03T05:00:0003 October 2003 05:00:00 10 CFR 21.21 Noncomformance Notification for Solid State Protection Master Relay 2011-06-27T20:11:00 | |