ENS 40433: Difference between revisions
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| event date = 01/08/2004 19:02 EST | | event date = 01/08/2004 19:02 EST | ||
| last update date = 01/08/2004 | | last update date = 01/08/2004 | ||
| title = Ts Required Shutdown | | title = Ts Required Shutdown at Oconee 1 Due to Unidentified Rcs Leakage | ||
| event text = Event Description: Reactor Coolant System, (RCS) Leakage in excess of TS limits. RCS leakage calculations have shown a gradual increase in leakage following Unit l start-up from a refueling outage. On 1/7/2004 @ 1800 hours an RCS leakage calculation was performed with the calculated leak rate at 0.300 gpm. On 1/8/2004 @ 1225 hours, with Reactor power at approximately 26% Rated Thermal Power (RTP), leakage had increased to 0.778 gpm. Personnel have entered containment and have determined the source to be within the A steam generator cavity. At 1312 hours a power reduction to 17% RTP was initiated to reduce dose sufficiently to allow entry into the cavity in an attempt to identify the exact leak source. On 1/8/2004 @ 1502 hours, the leak rate was calculated to be one gpm which exceeds the allowed leakage for unidentified leakage. Units 2 and 3 are unaffected and remain at 100% RTP. | | event text = Event Description: Reactor Coolant System, (RCS) Leakage in excess of TS limits. RCS leakage calculations have shown a gradual increase in leakage following Unit l start-up from a refueling outage. On 1/7/2004 @ 1800 hours an RCS leakage calculation was performed with the calculated leak rate at 0.300 gpm. On 1/8/2004 @ 1225 hours, with Reactor power at approximately 26% Rated Thermal Power (RTP), leakage had increased to 0.778 gpm. Personnel have entered containment and have determined the source to be within the A steam generator cavity. At 1312 hours a power reduction to 17% RTP was initiated to reduce dose sufficiently to allow entry into the cavity in an attempt to identify the exact leak source. On 1/8/2004 @ 1502 hours, the leak rate was calculated to be one gpm which exceeds the allowed leakage for unidentified leakage. Units 2 and 3 are unaffected and remain at 100% RTP. | ||
Initial Safety Significance: The measured leakage is well within the capacity of the normal RCS make-up system. The increase in leakage rate has been slow, and is not expected to increase significantly prior to completion of the TS required shutdown. The leakage is confined inside containment. At this time, there has been NO RADIOLOGICAL RELEASE associated with this event. | Initial Safety Significance: The measured leakage is well within the capacity of the normal RCS make-up system. The increase in leakage rate has been slow, and is not expected to increase significantly prior to completion of the TS required shutdown. The leakage is confined inside containment. At this time, there has been NO RADIOLOGICAL RELEASE associated with this event. | ||
Latest revision as of 22:24, 1 March 2018
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| LER: | 05000269/LER-2004-001 |
| Time - Person (Reporting Time:+-4.83 h-0.201 days <br />-0.0287 weeks <br />-0.00662 months <br />) | |
| Opened: | Roy Smith 19:12 Jan 8, 2004 |
| NRC Officer: | Rich Laura |
| Last Updated: | Jan 8, 2004 |
| 40433 - NRC Website
| |