TXX-6583, Interim Deficiency Rept CP-87-27 Re Galvanic Corrosion in Component Cooling & Svc Water Sys.Initially Reported on 870629.Sys Being Reviewed to Identify Components Affected by Condition.Next Rept Will Be Submitted by 870821
| ML20236E406 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/28/1987 |
| From: | Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-27, TXX-6583, NUDOCS 8707310359 | |
| Download: ML20236E406 (1) | |
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M Log # TXX-6583
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Ref: 10CFR50.55(e) 1
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1UELECTRIC,
.Wmium G. Counsil Execwive Vice President i
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- U. S. Nuclear Regulatory Commission 1
. Attn: Document, Control Desk i
Washington, D.C1 20555 i
SUBJECT:
COMAW.NEPEAKSTEAMELECTRICSTATION(CPSES) 00CKEF NOS. 50-445 AND 50-446 GALVANIC CORROSION IN CCW AND SW SYSTEMS SDAR:
CP-87-27 (INTERIM REPORT) i Gentlemen:
l On June 29, 1987, we verbally notified your Mr. Shannon Phillips of a potentially reportable item. involving galvanic corrosion in Component Cooling Water (CCW).and. Service Water (SW) systems.
This is an interim report under the provisions of 10CFR50.55(e). Original notification included the CCW System, this was an error'as.only the SW, system is involved.
During design verification of the flow element specifications, a potential 1
design discrepancy has been identified involving dissimilar metals in the SW system. The annubars installed in this system are made of monel material.
l The piping materihl is both carbon steel and stainless steel.
Bolted contact of.the annubar mounting flange to the process flange on the piping could result in galvanic cerosion and possible degradation of the process flange.
I This conditions'could render the annubar inoperable and/or violate the o
l integrity of the piping systems.
Currently, we are reviewing this system to identify the: components affected by I
this condition. Our next report on this issue will be submitted no later than August 21, 1987.
Very truly yours, i
MA j W. G. Counsil
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By:
G. S. Keeley O /-
MCP/mlh Manager, Nuclear JAcensing c - Mr. R. D. Martin, Region IV 1
Resident Inspectors, CPSE3 (3) 8707310359 B707pg gDR ADDCK 0500 5
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' 400 Nott Olive Street LB 81 Dallas, Texas 75201
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