ENS 42146: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
||
| Line 16: | Line 16: | ||
| event date = 11/16/2005 15:30 CST | | event date = 11/16/2005 15:30 CST | ||
| last update date = 11/16/2005 | | last update date = 11/16/2005 | ||
| title = Potential Failure | | title = Potential Failure to Meet Required Response Times for Shutdown Outside Control Room | ||
| event text = After a timed walk down of an Off Normal Operations procedure for shut down outside the Control Room, it appears that required response times were not met. This is due to a new assumption that all actions would not function due to plant configuration. Some valve circuits are not protected with a second fuse that is isolated from the control room portion of the circuitry. The only fuse in the circuit may blow during the early part of the event, prior to manipulating the isolation switch on the breaker. Since the fuse could blow, there would be no control power to electrically manipulate the valve and that would cause the operator to go to the 'Response not Obtained' column adding time to the actions taken. | | event text = After a timed walk down of an Off Normal Operations procedure for shut down outside the Control Room, it appears that required response times were not met. This is due to a new assumption that all actions would not function due to plant configuration. Some valve circuits are not protected with a second fuse that is isolated from the control room portion of the circuitry. The only fuse in the circuit may blow during the early part of the event, prior to manipulating the isolation switch on the breaker. Since the fuse could blow, there would be no control power to electrically manipulate the valve and that would cause the operator to go to the 'Response not Obtained' column adding time to the actions taken. | ||
This issue was previously identified at Wolf Creek in 1985 in IE INFORMATION NOTICE NO. 85-09. However, additional research needs to be accomplished as to why some circuits have only one fuse. | This issue was previously identified at Wolf Creek in 1985 in IE INFORMATION NOTICE NO. 85-09. However, additional research needs to be accomplished as to why some circuits have only one fuse. | ||
Latest revision as of 22:19, 1 March 2018
| Where | |
|---|---|
Wolf Creek  Kansas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-2.57 h-0.107 days <br />-0.0153 weeks <br />-0.00352 months <br />) | |
| Opened: | Steve Gifford 18:56 Nov 16, 2005 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Nov 16, 2005 |
| 42146 - NRC Website
| |