ENS 42309
ENS Event | |
|---|---|
02:24 Feb 4, 2006 | |
| Title | Identified Rcs Pressure Boundary Leakage |
| Event Description | At 2124 hrs on 2/3/06, a containment leak inspection team reported pressure boundary leakage (RCS) at a welded connection on a 3/4" bypass line around the RHR loop suction valve 2HV8701B. Presently the unit is in Mode 3. Preparations are being made to commence cooldown to Mode 5 for repair of the leak.
Unit 2 was taken from 100% RTP to approximately 30% RTP beginning at 1200 hrs on 2/01/06 for repairs of an EHC leak on the main turbine front standard. The EHC leak was repaired and power ascension to 100 % RTP commenced at 2213 hrs on 2/01/06. Approximately 100 % RTP was reached on 2/3/06 at 0600 hrs. Between 1900 hrs on 2/01/06 and 1600 hrs on 2/02/06, radiation monitor 2RE2562A went into Intermediate Alarm for short durations on three different occasions. Due to moving the plant, an accurate RCS leak rate could not be performed. A containment entry was performed on the night shift 2/2/06 and again on dayshift 2/3/06. Utilizing a robot and camera, leakage was observed inside the bioshield in the area of RCS Loop #1. The source of the leak on both containment entries was inconclusive. At 1412 hrs on 2/3/06, a shutdown of Unit 2 was initiated to allow further investigation/repair of the leak inside containment. Unit 2 was placed in Mode 3 at 1807 hrs on 2/3/06. See also EN 42194 for a similar incident. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Vogtle  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-3.32 h-0.138 days <br />-0.0198 weeks <br />-0.00455 months <br />) | |
| Opened: | Steve A Phillips 23:05 Feb 3, 2006 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Feb 3, 2006 |
| 42309 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 524232016-12-10T01:42:00010 December 2016 01:42:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 424342006-03-20T18:00:00020 March 2006 18:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Due to Rcs Pressure Boundary Leakage ENS 423092006-02-04T02:24:0004 February 2006 02:24:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Identified Rcs Pressure Boundary Leakage ENS 421942005-12-09T20:44:0009 December 2005 20:44:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Rcs Pressure Boundary Leakage Identified 2016-12-10T01:42:00 | |