ML18051A591
| ML18051A591 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/06/1983 |
| From: | Toner K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR NUDOCS 8309090582 | |
| Download: ML18051A591 (2) | |
Text
consumers Power company General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 September 6, 1983 Dennis M Crutchfield, Chief Operating Reactor Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - SEP TOPIC III-6 "SEISMIC DESIGN CONSIDERATIONS" -
COMPLETION OF CONTROL PANEL EVALUATIONS Consumers Power Company submitted to the NRC a seismic evaluation for struc-tural integrity of selected electrical equipment and anchorage of components contained in electrical cabinets at the Palisades Plant on January 18, 1983.
As indicated in the submittal, the evaluation of anchorage of subcomponents in the control room control panels and of structural integrity of Control Panel Cl26 was expected to be completed by July 1, 1983.
The purpose of this letter is to inform you that the evaluations will not be completed until April 1, 1984.
The completion of the aforementioned evaluations is being postponed due to the difficulty in obtaining anchorage information for electrical components in the control room panels during plant operation.
Consumers Power Company expects to take advantage of the current refueling outage (which began on August 13, 1983) to complete the field survey necessary for evaluation of electrical subcomponents anchorage.
Also, Consumers Power Company is currently obtaining an analytical program capable of developing in-cabinet response spectra from modal data previously obtained for the control room panel anchorage evaluation program.
Consumers Power Company believes that the information obtained from the analytical program is necessary to qualify the anchorage of subcomponents.
Control Panel Cl26 was qualified to the operating basis earthquake at time of purchase.
The stresses resulting from the seismic evaluation performed to qualify the Cl26 cabinet structure are very low, therefore, the stresses developed as a result of the safe shutdown earthquake are expected to be within the allowable stress limits.
The evaluation does not include an analysis of the frequencies of the Cl26 cabinet structure plate elements.
However, Panel C04 in the control room is of similar construction to that of Panel Cl26.
Panel C04 was tested and frequencies of 17 hertz and above were OG09~3-0_Q0~4-NJ...Q2 8309090582 830906 PDR ADOCK 05000255 P
e Dennis M Crutchfield, Chief 2
Palisades Plant SEP TOPIC III-6 September 6, 1983 obtained.
Due to similarity of construction and mass distribution, the same or higher frequencies are expected to exist in C126~ The accelerations at these frequencies are low and, therefore, the stresses may also be expected to be low.
Kerry A Toner Senior Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades OC0983-0002A-NL02