ML20031F327
| ML20031F327 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 09/23/1981 |
| From: | Lentine F COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8110190541 | |
| Download: ML20031F327 (2) | |
Text
-
C * [{h Commonwealth Edison g
) Ona Fir 1t N! tion 11 Ptza. Chicigo, Illino s
_ PRINCIPAU STAFF 4
] Addr'ss R; ply to: Post Offics Box 767 3IR E&Is g
(f Chicago, Illinois 60690 a/D pao September 23, 1981
}/D Sto
//7R&PI DE&TI Mr. James G. Keppler, Director ogpsos
- pti, Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road
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c)
S Glen Ellyn, IL 60137
/
(g R$ ll) @C
~~i OCTI 6198g ;II,
Subject:
Zion Station Unit 2 Centrifugal Charging Pump u.s. %
Casings
%=o.e
- s.f NRC Docket No. 50-304 4
/
%/
References (a):
/ QT D.
L.
Peoples to J. G. Keppler.
):
November 14, 1980, letter from T.
R.
Tramm to J.
G.
Keppler.
(c):
June 17, 1981, letter from T. R.
Tramm to J. G. Keppler.
Dear Mr. Keppler:
Reference (c) outlined our plan for replacement of the Zion Unit 2 Centrifugal Charging Pumps with pumps constructed with all stainless steel casings.
This is to inform you that'there has been a change to the schedule for replacement that was provided at that time.
It was our intention to replace one of the pumps at each of the refueling outages scheduled for the Fall of 1981 and 1982, respectively.
This schedule was based on our best estimate of expected delivery dates for the new pumps.
However, the new pump casing that was c;heduled for delivery in September of 1981 has been delayed and will not be available until January, 1982.
An attempt i
was made to procure as a replacement a pump intended for a nuclear unit deferred by another utility, but incompatibilities of design made that pumo casuitable for direct replacement.
As a result, we will not be able to perform a pump replacement during the Fall 1981 refueling outage.
It is now our intention to replace one of the pumps at each of the refueling outages scheduled for the Fall of 1982 and 1983, respectively.
As described in Reference (a) anu (b), the casing clad cracks in the existing pumps present no immediate safety concern.
In view of the low corrosion rates expected, it is felt p g /
n
(
) O ADO O
- d.4, s
1 J. G. Keppler September 23, 1981 that there will be no adverse effect on the ability of the pumps to perform their safety function prior to their replacement.
As additional assurance, performance of the monthly periodic testing required by-Technical Soecifications, which includes local vibration monitoring and visual observation of the pump, will serve to monitor the' continued integrity of the pump casing and provide early detection of any degiadation.
Please address questions regarding this matter to this office.
Very truly yours,
.l
$4 F.
G.-Lentine Nuclear Licensing Administrator 1
i cc:
Zion Resident Inspector i
1m 1
2558N t
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.