ENS 46227
ENS Event | |
|---|---|
02:50 Sep 3, 2010 | |
| Title | Notification of Unusual Event Declared Due to High Water Level in the Rcic Instrument Sump |
| Event Description | This is a one-hour report for the discovery of a condition that met an emergency action level (EAL) for a Notification of Unusual Event (NOUE). EAL HU1 - Natural and Destructive Phenomena Affecting the Protected Area Threshold Value 6 states: 'Exceeding Max Normal Operating Values specified in EOP 31EO-EOP-014-1(2) SC - Secondary Containment Control Table 5 Secondary Containment Operation Water Levels.'
On September 2, 2010 Plant Hatch Unit 2, as part of an on-going RCIC [Reactor Core Isolation Cooling] system outage, was restoring a tagout which un-isolated the CST [Condensate Storage Tank] from the RCIC system. The shift crew received several alarms in a short period of time for RCIC Northwest Diagonal Instrument Sump levels culminating with receiving the RCIC N-W DIAG INSTRSUMP LVL HIGH HIGH HIGH alarm at 2240. There was a report of water on the floor of the diagonal and 2E51-FV005 (a vent valve on the discharge of the barometric condensate pump) was identified as the source. The shift crew closed 2E51-F010 [suction isolation valve to the CST] to isolate the CST from the RCIC system. The Shift Manager declared an NOUE at 2250 for HU-1 Natural and Destructive Phenomena Affecting the Protected Area. At 2255 the Triple High alarm cleared. Plant personnel have visually confirmed that the sump level has been pumped down to normal level. The water level in the RCIC room did not rise to a level such that any equipment was adversely affected. Plant Hatch notified the following agencies: Georgia EMA, Appling County EMA, Jeff Davis County EMA, Tattnall County EMA, and Toombs County EMA. At the time of this notification, exit criteria for exiting the NOUE had been met and Hatch personnel were in the process of officially terminating the NOUE. The licensee will notify the NRC Resident Inspector.
|
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.08 h-0.128 days <br />-0.0183 weeks <br />-0.00422 months <br />) | |
| Opened: | Bill Duvall 23:45 Sep 2, 2010 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Sep 3, 2010 |
| 46227 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 525262017-02-01T21:05:0001 February 2017 21:05:00
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