ENS 40424
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ENS Event | |
|---|---|
01:38 Jan 3, 2004 | |
| Title | Unit 1 Declared an Unusual Event Due to 14 Gpm Unidentified Rcs Leakage |
| Event Description | At 2038EST Unit 1 Control Room Operators observed and quantified unidentified RCS leakage of approximately 14 gpm based on containment sump pump operation and a corresponding decrease in VCT level. Unit 1 was preparing for startup and there were no ongoing maintenance activities at the time. The licensee declared an Unusual Event entering their emergency procedures to isolate and identify the source of the leakage. As a result, a pressurizer sample line was isolated which terminated the leakage. The licensee will remain in the Unusual Event until an investigation is completed confirming that this was the source. There was no measured increase in radiation levels/humidity inside containment or radioactive release to the environment.
At the time of the report, 3 of the 4 RCPs were operating for forced circulation with the 4th RCP secured earlier in the day during a test. All ECCS systems are available including the EDGs, if needed. Normal makeup is in service to maintain RCS inventory with MFW supplying the Generators for decay heat removal via the steam bypass to the Main Condenser. The licensee informed state/local agencies and will inform the NRC Resident Inspector. At 2158EST the NRC determined that this event did not require entry into the Monitoring Phase of Normal Mode.
The licensee terminated the NOUE at 2353 hours0.0272 days <br />0.654 hours <br />0.00389 weeks <br />8.953165e-4 months <br /> EST on 01/02/04. The leak has been identified as coming from a relief valve flange on the pressurizer sample line. Maintenance activities are on-going to repair the leak and the reactor remains in mode 3. The licensee has notified state and local government of the NOUE termination and will be notifying the NRC Resident Inspector. Notified R2DO (David Ayres), FEMA (Dan Sullivan), DIRO (Tim McGinty), NRR (Pao-Tsin Kuo), NRC (Thomas) |
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.13 h-0.172 days <br />-0.0246 weeks <br />-0.00566 months <br />) | |
| Opened: | Sylvester Montgomery 21:30 Jan 2, 2004 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Jan 3, 2004 |
| 40424 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 579142025-09-10T16:07:00010 September 2025 16:07:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - RCS Identified Leakage Greater than 25 Gpm for Greater than 15 Minutes ENS 577112025-05-15T22:28:00015 May 2025 22:28:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Loss of All Offsite Power ENS 557332022-02-05T08:57:0005 February 2022 08:57:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Visual Observation of Smoke and Multiple Fire Alarms in the West Penetration Room ENS 533962018-05-10T20:17:00010 May 2018 20:17:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event ENS 517702016-03-06T20:20:0006 March 2016 20:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Emergency Declaration Due to Fire/Explosion in the Main Transformer ENS 510262015-04-30T22:40:00030 April 2015 22:40:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Electrical Fault ENS 461672010-08-11T16:07:00011 August 2010 16:07:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 3 Declared an Unusual Event Due to Loss of Annunciators ENS 411372004-10-20T02:10:00020 October 2004 02:10:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Unexplained Decrease in Spent Fuel Pool Water Level ENS 404242004-01-03T01:38:0003 January 2004 01:38:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 1 Declared an Unusual Event Due to 14 Gpm Unidentified Rcs Leakage 2025-09-10T16:07:00 | |
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