ML20101T126
| ML20101T126 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 01/08/1985 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| (RDC-113(84)), NUDOCS 8502050836 | |
| Download: ML20101T126 (2) | |
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TiiE CLEVELAN D ELECTRIC !LLU MIN ATitin CO M PM!Y P.o. box 5000 - CLEVELAND. OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLOG. - 55 PUBLICSoUARE Serving The Best Location in the Nation January 8, 1985 MURRAY R. EDELMAN Pr(IcaITY RouTIkG j-,
g VICE PRESIDENT L
NucTr". James G. Keppler I
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Regional Administrator, Region III d S CL Office of Inspection and Enforcement jp-.-
U.S. Nuclear Regulatory Commission i
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799 Roosevelt Road FCe Glen Ellyn, Illinois 60137 RE: Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Air Handling Units
[RDC 113(84)]
Dear Mr. Keppler:
This letter serves as to amend our final report which was filed on October 11, 1984. That report concerned a discrepancy with seismic equipment qualification data for Units I and II Air Handling Units which were fabricated and supplied under Procurement Specification SP-646 by Carrier Corporation. A total of twelve Air Handling Units were supplied, seven for Unit I and Common and five for Unit II which were considered subject to this deficiency.
Mr. J. W.
McCormick-Barger of your office was originally notified on September 11, 1984, by Mr. P. P. Martin of The Cleveland Electric Illuminating Company (CEI) that this problem was being evaluated.
This report contains a description of the deficiency, an analysis of safety implications, and the corrective action taken. As a result of the additional analysis discussed below, it has been determined that this condition is not reportable pursuant to 10CFR50.55(e).
Description of Deficiency During preoperacional testing of one of the Air Handling Units, fan vibration problems were encountered. A field test to determine natural frequency was conducted in both the operating and static mode. Results of this test indicated natural frequencies at both the motor and fan within the range of 15 to 28 Hz.
The natural frequencies found during this test were in conflict with the qualification report for the units, which indicated rigidity out to approximately 42 Hz.
The proposed corrective action, as stated in the October 11, 1984, report involved reinforcement of the units to increase their natural frequency to a value greater than 33 Hz.
One unit was modified by adding reinforcement which corrected the vibration problem; however, the additional reinforcement did not 8502050836 850108 PDR ADOCK 05000440 g
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,a JWr.,Jrmes G.-K;ppisr 2-Jcnuary 8, 1985-A significantly. raise-its natural frequency.~ :It was decided, therefore, to Linvestigate'.the adequacy of. design of.the as-built units at lower frequencies t
. and correspondingly higher accelerations.
Analysis of Safety Innlication-I JAn analysis was performed by.the Architect / Engineer of'the units to
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resubstantiate the seismic qualifications of the units'at. lower frequencies.
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- The analysis ^was - reviewed on site and found to be acceptable. Based on the-analysis report, CEI ' considers the AHU's qualified without any modifications.
'The approach used in the~ analysis. follows.IEEE 344-1975 and R. G. 1.100. Peak U
= accelerations, taken.from the appropriate floor response spectra, covering both t'
the measured and calculated frequencies and increased by a conservative factor, were used to calculate stresses and deflections of various components within
-the AHU's.and compared to allowable values. The analysis performed on the r
unmodified units also addresses the modified unit by showing that the l
reinforcement reduces stresses and deflections even further.
Corrective Action i
Based on the acceptance of the units by analysis for use at the lower' 1
frequencies,'no further action is required. Nonconformance Reports TAS 087 and
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TAS 088 have been closed out based on the above analysis.
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Please call if there.are any questions.
i-Sincerely, d'
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Murray R. Edelman
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Vice President Nuclear Group-MRE:pab P
l-cc: Mr. J. A. Grobe j
USNRC, Site Office (SBB50)
Mr. D. E. Keating l.
USNRC, Site Office (SBB50)
Records Center,-SEE-IN Institute of Nuclear Power Operations l
1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia '30339 i
Director
' Office of Inspection and Enforcement
.U.S. Nuclear Regulatory Commission Washington, D.C.-
20555 l
j U.S. Nuclear Regulatory Commission-c/o Document Management Branch l
. ashington, D.C. - 20555.
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