ENS 53908
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ENS Event | |
|---|---|
03:37 Mar 3, 2019 | |
| Title | Manual Reactor Trip Due to Degrading Main Condenser Vacuum |
| Event Description | On March 2, 2019 at 2237 EST, North Anna Unit 2 reactor was manually tripped, while operating at approximately 12 percent power, due to degrading vacuum in the main condenser. The unit was in the process of a planned shutdown for refueling when condenser vacuum degraded to greater than 3.5 inches of mercury absolute. The operations crew entered the reactor trip procedure and stabilized the unit in Mode 3 at normal operating pressure and temperature.
All control rods fully inserted into the core following the reactor trip. The reactor protection system actuation is reportable per 10 CFR 50.72(b)(2)(iv)(B). There were no ESF system actuations. Decay heat is being removed by the Steam Generator Pressure Operated Relief valves. Unit 2 is in a normal shutdown electrical lineup. The NRC Resident Inspectors have been notified. The Louisa County Administrator will be notified. |
| Where | |
|---|---|
North Anna  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-3.4 h-0.142 days <br />-0.0202 weeks <br />-0.00466 months <br />) | |
| Opened: | David Mosser 00:13 Mar 3, 2019 |
| NRC Officer: | Joanna Bridge |
| Last Updated: | Mar 3, 2019 |
| 53908 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (12 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 571482024-05-29T10:24:00029 May 2024 10:24:00
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