ML19224D792
| ML19224D792 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 07/12/1979 |
| From: | Reed C COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7907170053 | |
| Download: ML19224D792 (2) | |
Text
i Commonwealth Edison One First National Plaza. Chicago. Ulinois Address Reply to: Post Office Box 767 Chicago. lilinois 60690 July 12, 1979 Mr. Harold R.
Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Zion Station Units 1 and 2 Inspection of Bergen-Patterson Hydraulic Shock Absorbers NRC Docket Nos. 50-295 and 50-304 References (a):
December 10, 1973 letter from J.
S.
Bitel to J.
F. O' Leary (b) :
March 31, 1978 letter from N.
E.
Wandke to E.
G.
Case
Dear Mr. Denton:
Per Reference (a), Commonwealth Edison Company committed to inspect Bergen-Patterson snubbers on the following basis:
1.
When the unit is shutdown for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or longer and the snubbers have not been inspected for 30 days; and 2.
Within 120 day intervals.
This inspection requirement was to be in effect until the tolded polyurethane seals installed in the Zion snubbers were proven compatible with the silicone snubber fluid.
Per Reference (b), Commonwealth Edison notified the NRC that the inspection frequency of the Bergen-Patterson snubbers was being changed from a 120 day interval to each refueling outage.
This change was based on radiological considerations and proven snubber seal compatibility from over 40 inspections in which no abnormalities or seal leakages were found.
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7907170 0 5~ 3 Q
Commonwealth Edison NRC Docket Nos. 50-295/304 Mr. Harold R.
Denton: July 12, 1979 With NRC approval of technical specifications for shock suppressors (snubbers) for Zion Station in March 1979, Commonwealth Edison will now inspect the subject snubbers in accordance with the requirements of Sections 3.22 and 4.22 of the Zion Station Technical Specifications with inspection records kept on file for review.
As a result, future reporting on the subject snubbers will be accomplished via the Licensee Event Report process.
Please address any questions concerning this matter to this office.
Very truly yours, t
Cordell Reed Assistant Vice-President 356 327