ENS 51624
ENS Event | |
|---|---|
16:12 Oct 29, 2015 | |
| Title | Invalid Actuation of Unit 2 2C Safeguards Equipment Cabinet |
| Event Description | This is to report the Salem Unit 2, 2C Safeguards Equipment Cabinet (SEC) actuation due to an invalid signal.
This report is being made per paragraphs 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A) to address the invalid actuation of the 2C SEC on October 29, 2015, during performance of maintenance on the Solid State Protection System (SSPS). Plant conditions: Salem Unit 2 was in Mode 6 at the time of the invalid actuation. On October 29, 2015, at approximately 1112 [EDT] during performance of maintenance to replace slave relays in the SSPS output test panel 131, the maintenance technician inadvertently made contact with the relay plunger for the 2C SEC. This caused a signal to be sent to the 2C SEC which actuated the equipment associated with it. The 2C SEC train responded to the signal as required. The equipment associated with the 2C SEC that was not previously removed from service for outage related activities or already in service responded as required. As a result of the actuation, the 2C Emergency Diesel Generator (EDG) started but did not load (no undervoltage condition existed on the associated vital bus requiring loading), the Unit 2 Emergency Control Air Compressor (ECAC) started. The 22 Charging Pump (CVC) started, and the 22 Safety Injection Pump (SI) started (the Sl pump did not inject as it was isolated and in the process of being tagged out of service at the time of the invalid signal). The cause of the invalid actuation signal was a human performance error. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Salem  New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1431.43 h59.643 days <br />8.52 weeks <br />1.961 months <br />) | |
| Opened: | Jack Osborne 08:38 Dec 28, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Dec 28, 2015 |
| 51624 - NRC Website
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WEEKMONTHYEARENS 537862018-10-15T04:00:00015 October 2018 04:00:00
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