ML043310178
| ML043310178 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 12/30/2003 |
| From: | Fillion P NRC/RGN-II |
| To: | Matt Thomas NRC/RGN-II |
| References | |
| FOIA/PA-2004-0277, IR-03-007 IR-03-005 | |
| Download: ML043310178 (3) | |
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M McKenzie Thomas - Revised Report Input Page 1 1 From:
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Paul Fillion
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0 Z McKenzie Thomas 12/30/03 10:44AM Revised Report Input The writeup I sent yesterday for closure of a McGuire open item has been revised according to comments by Chuck Ogle. Here is the latest version.
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Revised Report Input 12/30/03 10:44AM Paul Fillion PJF@nrc.gov Recipients ATLPO.ATLDO MXT2 (McKenzie Thomas)
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Size 4265 591 Date & Time 12/30/03 07:18AM 12/30/03 10:44AM None Standard No None No Standard
- 1s INPUT FOR MCGUIRE INSPECTION REPORT 03-05 by Paul J. Fillion 40A5 Other
.01 (Closed) Unresolved Item (URI) 50-369. 370103-07-01: Fire Suppression System for Dedicated Shutdown Areas Not in Accordance with 10 CFR 50, Appendix R, Section III.G.3 The NRC opened this Unresolved Item (URI) to determine whether backfit as defined by 10 CFR 50.109, Backfitting, is warranted to require the licensee to provide fire suppression capability which covers the whole area as opposed to the existing partial area coverage in certain fire areas. Though the URI writeup describes the partial suppression system in Fire Area 4, the report alludes to other III.G.3 areas with similar partial suppression, but does not give specifics.
The inspector reviewed key historical documents to determine what was initially reviewed and approved by the NRC with regard to fixed fire suppression systems in the various plant areas. Based on this review, the inspector concluded that the current design of the fire protection systems as relates to this unresolved item was reviewed by the NRC in 1979 and found to be in compliance with Appendix A to Branch Technical Position APCSB 9.5-1, "Guidelines for Fire Protection for Nuclear Power Plants Docketed Prior to July 1, 1976."
The inspector used the significance determination process to determine the change in risk that would result from expanding the existing suppression system from partial coverage to area wide coverage. This analysis indicated no significant difference in risk between the normal suppression and degraded suppression cases. Hence the inspector concluded that backfitting to provide area wide suppression is not warranted. This analysis considered the worst case of post-fire shutdown with only the Standby Shutdown Facility available. Both the transient worksheet and the loss of nuclear service water worksheet were evaluated. Insights gained from this analysis, which focused on Fire Area 4, led to the conclusion that the same result would be obtained for any auxiliary building III.G.3 area at McGuire. This is primarily due to the small difference in initiating event likelihood between the two cases under consideration and the relatively low likelihood values. There were only three other III.G.3 areas. Two were the cable spreading rooms, which had misty fog type suppresion systems. The other was the control room, which is a generic exception to the requirement to have a fixed suppression system.
This Unresolved Item is closed.