ENS 41498
ENS Event | |
|---|---|
10:40 Mar 16, 2005 | |
| Title | Discovery of After-The Fact Emergency Condition Unusual Event |
| Event Description | The licensee provided the following information about the event via facsimile (licensee test in quotes):
On 3/16/2005 at approximately 0540 preparations were being made to drain down the RCS. A tagout needed to be released to support aligning the RCS for drain down. The tagout was not completely released prior to opening the intermediate leg loop drain valves. When the intermediate leg loop drain valves were opened, a flow path was created which resulted in draining the RCS. The Control Room noted approximately 70 gpm mismatch between letdown flow and charging. Personnel in containment manipulating the valves discovered that water was flowing unexpectedly to a trough in containment when they went to position the last set of intermediate leg loop drain valves and they quickly isolated the flow path. The time frame that the flow path existed was approximately 10 minutes. When the Shift Manager evaluated the event for Emergency classification the flow path had been isolated. The Shift Manager was not clear on if this event met the guidance for an NOUE declaration and asked for assistance from the Outage Control Center. Corporate licensing and Emergency preparedness were contacted for additional assistance. At 0930 it was decided to report the event per 50.72 (a) General Requirements even though it is not clear that the threshold for an EAL was met. Per NUREG-1022 the NRC staff does not consider actual declaration of the Emergency Class to be necessary when the event has rapidly terminated and the basis for the emergency class no longer exists. The licensee stated that the threshold for an Unusual Event declaration per the Vogtle EALs is 25 gpm identified RCS leakage. The NRC Resident Inspector has been notified as well as courtesy notifications to state and local authorities.
|
| Where | |
|---|---|
Vogtle  Georgia (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-0.3 h-0.0125 days <br />-0.00179 weeks <br />-4.1094e-4 months <br />) | |
| Opened: | Rob Dorman 10:22 Mar 16, 2005 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Mar 16, 2005 |
| 41498 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 549632020-10-19T08:00:00019 October 2020 08:00:00
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