ML19211A215
| ML19211A215 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 10/31/1979 |
| From: | Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-79-01A, IEB-79-1A, NUDOCS 7912170206 | |
| Download: ML19211A215 (2) | |
Text
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October 31, 1979 Fort St. Vrain Unit Nc. 1 P-79259 fir. Karl V. Seyfrit, Director Nuclear Regulatory Commission Region IV Office of Inspection and Enforcement 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012
Subject:
Environmental Qualification of ASCO Solenoid Valves
Reference:
I & E Bulletin 79-OlA PSC Correspondence P-79224 - Dated 9/28/79
Dear fir. Seyfrit:
i'er vor telephane conversation of October 19, with fir. Dan ficDonald, we have contacted ASCO and obtained information relative to the environ-mental qualification requirements of their valves and have reviewed their recommendations concerning qualified life of the components and proper preventative maintenance recommendations.
As a result of aging inherent to the resilient parts at ambient temperatures up to 140 F maximum, we will initiate a maintenance program to change out the resilient parts of the safety related, environmentally qualified ASCO valves within the recomended maximum service life requirements established by the manufacturer.
The maintenance program will be accomplished by placing the safety related ASCO solenoid valves on a staggered four-year program such that approximately one quarter of the valves will be maintained each year.
It is anticipated that the maintenance program will allow for complete replacement of resilient parts in one loop prior to commencing part change out in the second loop.
It will therefore require two years to complete resilient part replacement in a given loop.
1591 021 7912170
~
P-79259 October 31, 1979 Periodic replacement of the solenoid coils in the valves will be performed as necessary in lieu of periodic replacement based upon past operating history which has revealed no failures in the eight years of operation to date.
The program to change out resilient parts within the valve will allow for periodic inspection of the solenoid coil ~within the maximum recommended service life of the manufacturer.
The valve maintenance program will be coordinated with plant operation requirements such that plant operability is not jeopardized.
PSC will initiate the ASCO solenoid maintenarice program in 1980 and will complete the initial resilient part change out of all existing safety related valves in 1984.
PSC is of the opinion that the safety related ASCO solenoid valve maintenance program outlined above meet the intent of I & E Bulletin 79-OlA.
Please refer any further questions regarding I & E Bulletin 79-0! A to this office.
Very truly yours, E
Y lVCG c
s Frederic E. Swart Nuclear Project Manager FES/TCP/scp 1591 022