ML20137L641
| ML20137L641 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 11/26/1985 |
| From: | Phyllis Clark GENERAL PUBLIC UTILITIES CORP. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8512030500 | |
| Download: ML20137L641 (3) | |
Text
I GPU Nuclear Corporation NU@IMf 100 Interpace Parkway Parsippany, New Jersey 07054-1149 (201)263-6500 TELEX 136-482 Writer's Direct Dial Number:
November 26, 1985 (201) 263-6797 Mr. John A. Zwolinski, Chief Operating Reactors Branch No. 5 Division of Licensing United States Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Zwolinski:
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 Environmental Qualification of Electrical Equipment The purpose of this letter is to document that GPU Nuclear Corporation has established and carried out a program for ensuring the environmental qualification of safety-related electrical equipment in accordance with 10CFR50.49.
The Oyster Creek Environmental Qualification Program was comprised of four elements:
1.
A methodology and criteria for definition of systems and components required to be environmentally qualified was prepared.
Using that methodology and criteria, an Environmental Qualification Master List (all safety-related electrical equipment in harsh environments relied upon during design basis events to bring the plant to safe shutdown) was developed.
This master list also included non-safety-related electric equipment, the failure of which under postulated conditions could prevent satisfactory accomplishment of safety functions, and it includes certain Regulatory Guide 1.97 post accident monitoring equipment.
GPU Nuclear has qualified each component on that list using the D0R Guidelines, NUREG 0588, or 10CFR50.49 as appropriate.
As part of developing the master list, plant walkdowns were conducted on accessible components in late 1984 and early 1985 to verify the make, model, and location of equipment.
Some types of equipment, such as MCCs, limitorque motors, and terminal boxes, were sampled to verify identification of subcomponents.
A total of 451 components were inspected and 46 deficiencies were noted.
All deficiencies noted (i.e., damage, unqualified parts, missing seals, etc.)
have been resolved.
0512O30500 851126 PDH ADOCK 05000219 P
PDN GPU Nuclear Corporation is a subsidiary of General Public Utihties Corporation
r-
. 2.
The environmental service conditions in plant areas were calculated to identify harsh accident environments.
Some minor revisions are being made to incorporate additional refinement. Some revisions are expected to reduce the severity of the environmental condition and thus would not invalidate qualification status.
3.
Documentation of environmental qualification for components identified in Item 1 to withstand the conditions calculated in Item 2, above, is complete.
4.
A maintenance procedure which provides guidelines and requirements for the preventative maintenance, corrective maintenance, and surveillance for maintaining the environmental qualification of equipment was developed and is in place.
Implementation of the maintenance procedure during maintenance work perfonned during the 10M outage identified a problem with the gasket in a Barksdale pressure switch.
Further inspection of all 18 similar units on the Environmental Qualification Master List revealed 6 had non-qualified gaskets.
It appeared that the non-qualified gaskets were original factory issue but were not the same material as reflected in the Vendor Manual.
All 6 non-qualified gaskets were replaced by qualified gaskets during the recent outage (10M).
In addition, a special inspection effort was undertaken during the outage to detennine if this was a generic deficiency in the Environmental Qualification Program.
This involved review of the list of existing components qualified to D0R guidelines.
Six clas s of components were identified as having the greatest probability of naving similar deficiencies.
A sample of approximately 15% of these components was inspected.
One deficiency was disclosed which would have invalidated the qualification of a component.
This item was found to be damaged and was replaced.
Based on this sampling, we did not open and inspect all equipment.
If any deficiencies are identified as a result of our systematic maintenance program in the future, they, of course, will be resolved in accordance with that program.
In addition to the inspection activity identified above, the GPU Nuclear Corporate Quality Assurance Audit Group performed an audit in November, 1985 and found the environmental qualification modifications made during the 10M outage were in compliance with Environmental Qualification Program requirements.
e
. In summary, GPU Nuclear Corporation has completed an extensive program to define and qualify equipment as required in accordance with 10CFR50.49.
We have also developed and put in place a system to ensure maintenance and surveillance that will maintain the environmental qualification of equipment.
Adequate inspection has been performed to provide reasonable assurance that Oyster Creek meets the requirements of 10CFR50.49.
Sincerely, fb P. R. Clark President pfk 1084k cc: Administrator, Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Mr. Jack N. Donohew United States Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20014 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, New Jersey 08731