A Notification of Unusual Event has occurred on Unit 2 due to
Reactor Coolant System (
RCS)
unidentified leakage greater than 10 gallons per minute.
The licensee notified NRC Resident Inspector. Notified USDA (Brzostels).
- * * UPDATE AT 1754 ON 3/9/06 FROM T. PETRAK TO P. SNYDER * * *
No actual RCS leakage occurred and the RCS always remained intact. The additional water injection occurred and the RCS always remained intact. The additional water injection into the Reactor Coolant System was required to makeup for gases that came out of solution and accumulated in the reactor vessel head and were being vented from the RCS during a planned drain down.
The licensee terminated the Unusual Event at 1751 on 3/9/07. The licensee notified the NRC Resident Inspector, state, and local government agencies. The licensee will remain in Mode 5 for their planned outage.
Notified R2DO (G. Hopper), NRR EO (M. Case), IRD (T. Blount), NRR (J. Dyer), DHS (McKentry), FEMA (Biscoe), DOE (Wyatt), EPA (Burgess), HHS (Dalviel), USDA (Giles).
- * * UPDATE AT 1531 EDT ON 5/11/07 FROM ROBERT DORMAN TO GERRY WAIG * * *
This report is retracted based on the following:
On 3/9/07, an NOUE was declared while Unit 2 was in Mode 5, draining the RCS to support Rx Vessel disassembly, due to what was then diagnosed as an RCS Unidentified Leak greater than 10 gpm. Subsequent review of the event revealed that no leak existed and the mismatch between charging and letdown, which was the basis of the leak determination, was caused by a nitrogen bubble being vented from the Rx Vessel Head and the additional charging volume was displacing the nitrogen volume as it was being vented. As a result, Vogtle Unit 2 is retracting the NOUE classification that was made on 3/9/07.
The licensee informed the NRC Resident Inspector. Notified R2DO (Ernstes).
