ML20009F247
| ML20009F247 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 07/22/1981 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, RDC-31-(81), NUDOCS 8107300201 | |
| Download: ML20009F247 (2) | |
Text
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e TH E C L EV E L A N D E LECT R!C IL Lu niiN ATi"G CO M P A N Y P o Box 5000 e CLEVELANo. OHIO 44101 e TELEPHONE (216) 622-9800 e ILLUMINATING BLDG e
55 PUBLIC SOUARE omng e Ben Location in me Nation Datwyn R. Davidson VICE PRES 1 CENT SYSTE M ENGINEERING AND CONSTRUCT 60N
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July 22, 1981 "f
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Mr. James G. Keppler
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Director of Region III
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U.S. Nuclear Regulatory Commission
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Clen Ellyn, Illinois 60137
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799 Roosevelt Road PerryNucifrPowerPlant, RE:
Docket Nos 50-4HH-50-441 Interim Report on Missile Penetration Analysis for Safety Class Axial-Flow Fans (RDC 31 (81))
Dear Mr. Keppler:
This letter serves as the interim report as required by 10CFR 50-55(e) on a significant deficiency reported by Mr. William Kacer of The Cleveland Electric Illuminating Company (CEI) on June 22, 1981 in a telephone conversation with Mr. L. McGregor of the Nuclear Regulatory Commission Region III, Office of Inspection and Enforcement.
The deficiency concerns sixteen axial-flow fans supplied by the Buffalo Forge Company. Buffalo Forge first notified the NRC of this deficiency under 10CFR Part 21 on June 5, 1981.
CEI subsequently received notification from Buffalo Forge in a letter dated June 11, 1981.
This report includes a description of the deficiency, analysis of the safety implica-tions, and the corrective action to be taken.
Description of Deficiency Buf falo Forge had supplied a total of sixteen safety-related axial-flow fans for the Perry Nuclear Power Plant (PNPP) to be used in the llVAC system in the emergency service water punphouse and the diesel generator building.
None of the sixteen fans have been installed. Buffalo Forge has notified CEI that their fan casings, as fabricated, will not contain a generated missile. This condition does not meet the requirements of procurement specification SP-648-4549-00 for axial-flow fans.
Buffalo Forge had performed a missile penetration analysis during the initial design but has since developed a new method of calculation for the fan housing thickness.
Under this new meth6d, the current thickness does not meet the penetration requirements.
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Mr. James G. Keppler July 22, 1981 Analysis of the Safety Implications If the housings of the axial-flow fans are not of sufficient thickness to inhibit internally propogated fan missiles from piercing the shell and becoming a projectile, the possibility exists that the function of other surrounding safety-related equipment could be imapired.
Corrective Action Buf falo Forge has submitted to CEI a listing of all fans which are af fected. The lists identify Buf falo Forge's identification number, actual housing thickness and revised housing thickness. Buffalo Forge has notified Gilbert Associates, our architecture engineers, that they will provide drawings indicating the required modifications eo prevent missile penetration of the fan casings. These drawing 4 will be reviewed by Gilbert Associates for physical interference checks and sur, port requirements.
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Buffalo Forge is presently designing a method of reinforcing the fan casing to meet their new method of analysis and also in accordance with specification requirements.
The method for reinforcing the fan housing should be completed by October 31, 1981
.and a final report will then be submitted.
Very truly yours, I
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Dalwyn
. Davidson Vic' President System Engineering and Construction l
l DRD/llp cc:
Mr. J. Ilughes - NRC Site Mr. Victor Stello, Director Of fice of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D.C.
20555
.