ENS 48443
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ENS Event | |
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03:37 Sep 30, 2012 | |
Title | Inadvertent Alignment of Nuclear Service Water to Standby Nuclear Service Water Pond |
Event Description | On September 29, 2012, McGuire Nuclear Station experienced an inadvertent alignment of the Nuclear Service Water (RN) system suction and discharge to the Standby Nuclear Service Water Pond (SNSWP). This event occurred when a Unit 2 'B' Train blackout signal was inadvertently generated as a result of a tagging restoration/coordination error. This error resulted in the Unit 2 Train 'B' load sequencer sensing an under-voltage condition on 4160V Essential Switchgear 2ETB, which was de-energized at the time for maintenance activities. Further evaluation determined that the blackout signal which automatically aligned RN to the SNSWP was not in response to actual plant conditions or parameters satisfying the requirements for initiation of a blackout signal or the SNSWP safety function. Since alignment of RN to the SNSWP was not in response to a valid signal, this represented an invalid actuation reportable per the requirements of 10 CFR 50.73(a)(2)(iv)(A).
As allowed by 10 CFR 50.73(a)(1), McGuire is providing a telephone notification of this invalid actuation in lieu of submitting a written LER. The following additional information is being provided as part of the telephone notification of this event: 'B' Train of RN actuated to align Unit 1 and Unit 2 RN to the SNSWP. 'B' Train actuation of Unit 1 and Unit 2 RN to the SNSWP functioned successfully and was complete. The NRC Resident Inspector has been notified. |
Where | |
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Mcguire North Carolina (NRC Region 2) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+610.67 h25.445 days <br />3.635 weeks <br />0.836 months <br />) | |
Opened: | Eric G. Blough 14:17 Oct 25, 2012 |
NRC Officer: | Dong Park |
Last Updated: | Oct 25, 2012 |
48443 - NRC Website
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WEEKMONTHYEARENS 563452023-01-01T11:04:0001 January 2023 11:04:00
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