05000482/FIN-2008004-07
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Finding | |
|---|---|
| Title | Inadequate Reactor vessel head vent |
| Description | A self-revealing noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified due to an inadequate vent path for the reactor vessel head. The inadequate vent path resulted in the formation of a maximum void size of 2600 gallons in the reactor vessel head on March 23, 2008, while the plant was shutdown and depressurized. Wolf Creek found indirect evidence of a loop seal due to water that came out of the hard pipe portion of the vent rig at the end of the outage during vacuum filling of the reactor coolant system. However, the licensee could not exclude blockage in the piping. This issue was entered into the corrective action program and the licensee plans to conduct a more thorough inspection of the piping during the next refueling outage. The inspectors determined that the failure to provide adequate vessel head vent path to prevent gas accumulation in the reactor vessel during depressurized plant operations was a performance deficiency. The inspectors determined that this finding, which was associated with the initiating events cornerstone, was more than minor because if left uncorrected, it would have become a more significant safety concern. Specifically, without an adequate vent path the reactor vessel does not have an effective means of relieving noncondensable gases to prevent a loss of reactor coolant system inventory. The inspectors evaluated this finding using Inspection Manual Chapter 0609, Appendix G, Attachment 1, and determined it be of very low safety significance based upon the demonstrated availability of mitigating systems and the flooded reactor cavity inventory (Section 4OA3). |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2008004 Section 4OA3 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | R Deese D Dumbacher S Cochrum C Long P Alter J Groom W Schaup R Hickok |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2008004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2008Q3
Self-Identified List (Wolf Creek)
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