ML18052A843
| ML18052A843 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/21/1987 |
| From: | Kuemin J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-GTECI-A-46, REF-GTECI-SC, RTR-NUREG-CR-1833, RTR-REGGD-01.060, RTR-REGGD-1.060, TASK-03-06, TASK-3-6, TASK-A-46, TASK-OR, TASK-RR NUDOCS 8701290110 | |
| Download: ML18052A843 (2) | |
Text
consumers Power POW ERi Nii NllCHlliAN'S PROliRESS General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 January 21, 1987 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
SEP TOPIC III SEISMIC DESIGN CONSIDERATIONS -
PLANS AND SCHEDULE The NRC letter of October 20, 1986, requested Consumers Power Company to provide plans and schedules for resolution of the remaining open issues presented in the letter.
Consumers Power Company and members of your staff met on December 3, 1986, to discuss the unresolved issues.
The issues pertain to:
- 1.
Seismic input spectra;
- 2.
Out-of-plane vibration of floors and masonry walls;
- 3.
The structural integrity of electrical cabinets.
Our intention is to provide resolution of the issues by April 30, 1987.
In our meeting, three options were discussed regarding the seismic input spectra.
The first would be to continue use of the FSAR spectra employing the peak of that spectra in performing static analysi~. A multiplication factor of 1. 5 would have to be included to account for multimodal frequencies.
The second option is to use NUREG/CR-1833 response spectra derived from Regulatory Guide 1.60 spectra in performance of condu~ting dynamic analyses.
The third option is to use the amplified site specific spectra (refer to NRC letter dated September 6, 1983) to derive new floor response spectra for dynamic analysis.
Consumers Power Company proposes, at this time, to use the second option to employ the NUREG/CR-1833 response spectra.
We may, in the future, develop floor response spectra from the amplified site specific spectra and may then reevaluate our commitment to the NUREG/CR-1833 response spectra.
Concerning out-of-plane vibration of floors and masonry walls, we intend to provide the requested information by the scheduled April 30, 1987 date.
OC0187-0009-NL02
Nuclear Regulatory Commission Palisades Plant SEP'- TOPIC III-6 January 21, 1987 Regarding the structural integrity of electrical cabinets, the information requested concerning control panels C-llA, C-126 and C-33, switchgear lD, and motor control centers 1 and 2 will be provided on our committed schedule date and will incorporate the spectra considerations referenced above.
We also agree with the Staff's assessment that resolution of the Electrical Cable Tray issue will be during implementation of the Unresolved Safety Issue (USI) A-46.
~u~~
Staff Licensing Engineer CC Administrator, Region III, NRC NRC Resident Inspector - Palisades OC0187-0009-NL02 2