ENS 41498: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 03/16/2005 05:40 EST | | event date = 03/16/2005 05:40 EST | ||
| last update date = 03/16/2005 | | last update date = 03/16/2005 | ||
| title = Discovery | | title = Discovery of After-The Fact Emergency Condition Unusual Event | ||
| event text = The licensee provided the following information about the event via facsimile (licensee test in quotes): | | event text = 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. | 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. | ||
Latest revision as of 22:21, 1 March 2018
| 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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