ML18065B156
| ML18065B156 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/29/1998 |
| From: | Bordine T CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-96-06, GL-96-6, NUDOCS 9802040242 | |
| Download: ML18065B156 (2) | |
Text
. ~
I
~*
.... ~- *** J...... ' **
I.
)*. --
A CMS Energy Company JllOllUI* c. BonlJDB Manager
-* ~ ! ~ '
. {* *.**.,.
January 29, 1998 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT Licensing CHANGE IN COMMITMENT - GL 96-06, "ASSURANCE OF EQUIPMENT OPERABILITY AND CONTAINMENT INTEGRITY DURING DESIGN BASIS ACCIDENT CONDITIONS" Generic Letter (GL) 96-06, "Assurance of Equipment Operability and Containment Integrity During Design Basis Accident Conditions", was issued on September 30, 1996.
This GL requested a summary report within 120 days of actions taken in response to the NRC concerns. On January 27, 1997, Consumers Energy submitted their 120-day response to GL 96-06. One commitment was made within that response, as follows:
Compliance with FSAR piping design criteria for the Containment Air Cooler (CAC) discharge piping will be verified prior to the completion of the 1998 refueling outage.
GL 96-06, Supplement 1, was issued on November 13, 1997. This supplement stated that the revised guidance contained in GL 91-18, Revision 1, dated October 8, 1997, may be helpful in determining appropriate actions and schedules. This guidance has been reviewed by Consumers Energy and our commitment is being changed to read:
Compliance with FSAR piping design criteria for the Containment Air Cooler (CAC) discharge piping will be verified prior to the completion of the 1999 refueling outage.
Operability has been shown and will be maintained until final verification of full rc 0f fF~1-1
~_-i8l5~~~uiQing desigln criteria is made.
1111111111111111111111111111111111111111 !
l
~
p PDR I
9 9
3 E
8 6
I Paii~des"NuclearPlarii. 27780BiueStarMem6riaJHignway
- Cove;t,M/49043
- Te/:6167642913
- Fax:616764Z490
j 2
Further evaluation more accurately characterized the nature of the thermal hydraulic response of the service water system and containment air coolers during the design basis accident coincident with a loss of offsite power. System behavior during the steam void formation phase and during the void collapse phase have been further characterized through both experimental assessment and analytical modeling. These studies, as discussed with the NRC in a meeting on October 16, 1997, have resulted in more accurate estimates of the nature of possible waterhammer effects associated with
- the GL 96-06 scenario; effects which are less significant than those used in the operability analysis. We are proceeding to further validate these effects through an integrated thermal hydraulic analysis of service water piping associated with the Palisades containment air coolers.
As this analysis is continuing, modifications have not been identified and may not be required. As a result, it is not practical to plan what actions may be required during the upcoming 1998 refueling outage, which is scheduled to begin on April 24, 1998. For this reason, to avoid unnecessary or inappropriate modifications, the change in the commitment was made to complete the necessary actions prior to completion of the 1999 refueling outage.
SUMMARY
OF COMMITMENTS This letter contains no new commitments and one revision to an existing commitment.
The revised commitment is:
Compliance with FSAR piping design criteria for the Containment Air Cooler (CAC) discharge piping will be verified prior to the completion of the 1999 refueling outage.
Manager, Licensing CC Administrator, Region Ill, USNRC Project Manager, NRR, USNRC NRC Resident Inspector - Palisades