ML18066A412
| ML18066A412 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/18/1999 |
| From: | Haskell N CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9903240373 | |
| Download: ML18066A412 (2) | |
Text
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A CMS ~nergy Com{Jany
. March 18, 1999
- U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Palisades Nuclear Plant 21780 Blue Star Memorial Highway Covert, Ml 49043 DOCKET 50-255 - LICENSE *oPR-20 _- PALISADE.S PLANT
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Tel: 616 164 2216 Fax: 616 164 2490
- albaa L. llau1111 Director. Ucensing CONTROL ROOM VENTILATION COMMITMENT CANCELLATION Licensee Event Report (LER) 88-013-03, dated August 31, 1989, committed the Palisades Plant to modify the control room heating, ventilation, and air conditioning.
(CRHVAC) system. This modification would have provided automatic switch-over into the emergency mode based on detection of radiation by the radioactive gaseous effluent monitor~ng system and th~ main steam line. gamma monitor.. -'°. *.,.:: _:.. :.
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. On July 22, 1994, *Consumers Energy informed the NRC that this modification was not complete and thatthe project would be reviewed to re-assess the need for the modification. In LER 96-011, dated August 29, 1996, a commitment was made to evaluate whether automatic switch-over of the. CRHVAC to emergency mode is needed
. for events that cause the continuous air monitor (CAM) to alarm. In Consumers*
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Energy's reply to.a Notice of Violation contained* in Inspection Report. 50-255/96009
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(DRS), dated October 30, 1996, a new commitment was made to complete the
- modification to automatically switch-over the CRHVAC to the emergency mode.
During the design efforts to implement the modification, Consumers Energy determined that there were design aspects that had not been fully recognized and that the committed changes may not be justified. This resulted in the investigation of alternate solutions that led to a re-analysis of the applicable accident scenarios. It was determined that the modification to provide automatic switch-over of the CRHVAC to the emergency mode was not required to maintain operator exposures within regulatory*
limits. The re-analyses showed that alignment of CRHVAC into the emergency mode to mitigate the effects of an accident are not necessary until more than 20 minutes from the event initiation. This time period is sufficient to permit manual switchover of
.--:('rt..~~ "d-CRHVAC into the emergency mode and still comply with control room habitability requirements. This is acceptable in accordance with Standard Review Plan 6.4. It has
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therefore Qeen concluded that the modification to provide automatic switchover of the CRHVAC to emergency mode is not needed to meet regulatoryrequirements.
SUMMARY
OF COMMITMENTS 2*
This letter contains no new commitments and no revisions to existing commitments.*
One commitment is being withdrawn. That commitment was to complete a modificatiqn to automatically switch the CR HVAC system to the emergency mode.
CC. Administrator, Region Ill, USNRC Project Manager, NRR, USNRC,
. NRC Resident Inspector - Palisades