NRC-89-0091, Forwards Revised Response to NRC Generic Ltr 88-14, Instrument Air Supply Sys Problems Affecting Safety-Related Equipment. Compressors Overhauled Every 3,not 2 Yrs for Station Air Sys.All Necessary Changes Made to Program
| ML20246D771 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 04/24/1989 |
| From: | Sylvia B DETROIT EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-89-0091, CON-NRC-89-91 GL-88-14, NUDOCS 8905110042 | |
| Download: ML20246D771 (2) | |
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D. RNiph Syb Seruor vice President
.q 6400 North Dnue Hegnway ISO.
l Newport. Mectugan 48166
- (313) 586-4150
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April 24, 1989 NIC-89-0091 U. S. Nuclear Regulatory Commission.
Attn: Document Control Desk Washington, D. C.
20555
References:
- 1) ' Fermi 2 NRC Docket No.- 50-341 NRC License No. NPF-43
- 2) NRC Generic Letter 88-14, " Instrument Air Supply System Problems Affecting,
Safety-Related Equipment", dated August 8,1988
- 3) Detroit Edison Letter to NBC, " Response to NRC Generic Letter 88-14", NRC-89-0046,;
dated March 1, 1989
Subject:
Revised Response to NRC Generic Letter 88-14 Reference 3 provided Detroit Edison's response to Generic. Letter 88-14. Subsequent to the response, a review was performed of the Preventive Maintenance (PM) activities referenced in the response in order to cross-reference the PM activities to the commitments. The review identified that for the station air system, the compressors are overhauled every 3 years not' every 2 years as stated on page 9 of the response. The corrected page is enclosed.
Additionally, all other PM activities referenced in the response have been verified and necessary changes have been made to the' PM program to ensure that these activities are performed as indicated in our response to Generic Letter 88-14.
If you have any questions, please contact Mr. Girija Shukla at (313) 586-4270.
Sincerely, d
Enclosure cc:
A. B. Davis R. C. Knop W. G. Rogers J. F. Stang 8905110042 890424 V'
PDR ADOCK 05000341
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' Enclosure to NBC-89-0091 Page 1 o station air systesa (==niv portion to control air) once per shift - Compressor's oil temperature, oil o
pressure, cooling water temperature and receiver tank pressures are checked and recorded on the operator round sheets. These sheets are reviewed shiftly by operations management.
Monthly - Every 4 weeks a crankcase oil sample is taken, o
Quarterly - Tightness of valve covers is checked and inlet o
air. filters on the compressors are cleaned or replaced based on the "as-found" condition.
(Reference Procedure NPP-35.129.001),
Semi-annual - CoMensate drain traps on the intercoolers, o
af tercoolers and receiver tanks are inspected and cleaned.
t Annually - Compressor foundation bolts, taskmaster valve, o
piston rod packing, high & low pressure cylinders suction, discharge and feather valves are checked and refurbished, repaired, or replaced based on their "as-found condition".
Every 3 years - The compressors are overhauled.
o Additional PMs will be established and/or revised when the compressors, aftercoolers and receiver tanks drain improvement is completed. This activity is currently being performed per EDP 1511 and will be completed by the first refueling outage.
A review of verdor manuals for the noninterruptible control air dryers, interruptible control air dryer, control air compressors and station air compressors indicates that the maintenance being performed, as described, is adequate to maintain the instrument air quality and reliable function of the systems. In the past, the water and contaminants in interruptible control air were due to the interruptible control air dryer and its filters being by-passed while maintenance activities were performed on them. This resulted in station air being fed directly into the interruptible control air receiver tank. The present temporary air dryer connected in parallel with the permanent dryer allows for maintenance.
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