ML20072H621
| ML20072H621 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 03/21/1983 |
| From: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, LOZ-83-0001, LOZ-83-1, NUDOCS 8303290499 | |
| Download: ML20072H621 (3) | |
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L TH3 CINCINNATI GAS & ELECTRIC COMPANY
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CINCINN ATI. OHIO 45201 E. A. BORGMANN SEneon viCE PRESIDENT March 21, 1983 LOZ-83-0001 Docket No. 50-358 U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Attention:
Mr.
J.G.
Keppler Regional Administrator Gentlemen:
RE:
WM. H.
ZIMMER NUCLEAR POWER STATION - UNIT 1 10CFR50.55(e) - ITEM E GE HMA RELAYS W.O.
57300, JOB E-5590, FILE G56C, E-40 This letter constitutes an interim report concerning the subject conditions initially reported to the NRC on February 25, 1983 as a potentially reportable deficiency under the requirements of 10CFR50.55(e).
General Electric has identified two potential deficiencies in HMA relays.
t 1.
Some HMA relays manufactured in 1974 have insufficient clearance between the armature tail piece and the molded posts on either side of the tail piece.
If this condition exists, twisting of the armature may cause binding of the armature tail piece when the l
l armature is energized and prevent opening of the arm-l ature when it is de-energized.
2.
HMA relays manufactured from 1976 through June of 1981 also have a potential deficiency.
The uninsulated flexible leads to the moveable contacts are excessive in length and could come in contact with the coil I
circuit terminals.
A review of the safety related systems indicates that 196 HMA relays are used at Zimmer.
A preliminary survey reveals that many of the relays were manufactured during the time periods discussed above.
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9 Mr. J.G. Keppler -
Regional Administrator Region III March 21, 1983
. Page 2 The corrective actions for the above deficiencies are described below.
1.
HMA relays manufactured during the 1974 time period which are subject to binding will be inspected for a minimum of 0.005 inch clearance between the armature tail. piece and the posts.
If less than a 0.005 inch clearance exists, the relay will either be replaced or repaired.
Repairing the deficiency will involve increasing the gap between the posts and the tail piece by removing material from the posts.
2.
HMA relays manufactured from 1976 through June, 1981 which have the potential for excassive lead lengths will be inspected to determine if this condition exists.
Unacceptable relays will be repaired by applying a short length of heat shrink tubing to the leads to insulate them from the coil terminals.
A Construction Work Authorization Request (CWAR) is being prepared to obtain approval to perform the proposed corrective actions.
Completion of the required inspections and repair or replacement of the affected relays is contingent upon the NRC's approval of the CWAR.
A follow-up report will be submitted by May 31, 1983.
We trust the above will be found acceptable as an interim report under 10CFR50.55(e).
Very truly yours, THE CINCINNATI GAS & ELECTRIC CO.
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By E.A.
BORGMANN SENIOR VICE PRESIDENT RNT/WPC/bcf cc:
NRC Office of Inspection & Enforcement Washington D.C.
20555 NRC Senior Resident Inspector ATTN:
W.F.
Christianson NRC Zimmer Project Inspector Region III
Mr..J.G. Keppler Regional Administrator Region III March 21, 1983 Page 3 l
bcc:
J.C.
Herman H.C.
Brinkmann B.K.
Culver H.R.
Sager J.R.
Schott J.D.
Flynn K.K.
Chitkara J.F.
Shaffer G.C.
Picke D.J.
Schulte W.P.
Cooper D.J.
Steinmetz J.A. Vennemann General Electric Co..
Attn:
I.L.
Gray T.E.
Bloom Sargent & Lundy Engineers Attn:
R.J.
Pruski L.M. Gordon Henry J. Kaiser Co.
Attn:
M.F. Albertin W.A.
Hedzik L