ENS 41582
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ENS Event | |
|---|---|
05:50 Apr 9, 2005 | |
| Title | Reactor Scrammed from 61% Power Due to Low Reactor Water Level |
| Event Description | On 04/09/05 at approximately 00:50 an automatic reactor scram occurred on Brunswick Unit 2. The Reactor Protection System (RPS) actuated on low reactor water level (LL1). All control rods inserted from the RPS signal. The LL1 signal also provided a Group 2 (floor and equipment drain isolation valves), 6 (monitoring and sampling isolation valves) and 8 (shutdown cooling isolation valves) isolation signal for the respective containment Isolation valves. Reactor low level 2 (LL2) resulted in a Reactor Core Isolation Cooling (RCIC) system actuation and injection into the reactor. The High Pressure Coolant Injection (HPCI) system actuated but did not inject because reactor water level recovered. The Reactor Water Cleanup system (RWCU) isolated (Group 3 isolation). Secondary Containment isolated and the Standby Gas Treatment (SBGT) system initiated. An Alternate Rod Insertion signal was received and the Reactor Recirculation Pumps tripped as designed. An investigation is in progress to determine the cause of the reactor level transient. Safety systems and isolations functioned as designed.
The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000324/LER-2005-002 |
| Time - Person (Reporting Time:+-0.95 h-0.0396 days <br />-0.00565 weeks <br />-0.0013 months <br />) | |
| Opened: | John Reinsburrow 04:53 Apr 9, 2005 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Apr 9, 2005 |
| 41582 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (61 %) |
| After | Hot Shutdown (0 %) |
Brunswick with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 569772024-02-19T04:25:00019 February 2024 04:25:00
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ECCS Discharge Brunswick Unit 2 Scram Due to Generator/Turbine Trip 2024-02-19T04:25:00 | |
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