ENS 44624
ENS Event | |
|---|---|
07:07 Nov 3, 2008 | |
| Title | Manually Opened Reactor Trip Circuit Breakers to Insert Control Bank "B |
| Event Description | Manually opened reactor trip breakers in Mode 5 to insert control bank 'B' due to blown fuse in rod control cabinet.
Licensee was moving control rod bank "B" following I & C work, and the control rod bank failed to move as expected. All other control rod banks were inserted into the core at the time of the event. EDG's and offsite power sources are OPERABLE, and there is no increase in plant risk. The licensee will inform the NRC Resident Inspector.
Regarding the NRC Event Number 44624 conveyed November 3, 2008, McGuire Nuclear Station has determined that manually opening the reactor trip breakers was not reportable and hereby retracts this notification. Upon further consideration it was determined that manually opening the reactor trip breakers was a conservative decision to fully insert control rods based on the failure mechanism causing a single rod to drop to the fully inserted position. Manual actuation of the reactor trip breakers was not required by abnormal procedures and was performed only after consultation between operations, engineering and senior station management agreed that this was the preferred option. Therefore, the decision to manually open the reactor trip breakers is considered to be a preplanned actuation of the reactor protection system and is not reportable. The licensee informed the NRC Resident Inspector. Notified R2DO (M. Lesser). |
| Where | |
|---|---|
Mcguire  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-2.53 h-0.105 days <br />-0.0151 weeks <br />-0.00347 months <br />) | |
| Opened: | Eric Blough 04:35 Nov 3, 2008 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Dec 31, 2008 |
| 44624 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | Yes, Manual Scram |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 568022023-10-18T15:16:00018 October 2023 15:16:00
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