ML20009F599
| ML20009F599 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/01/1981 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55EE, 10CFR-50.55EE, NUDOCS 8107310343 | |
| Download: ML20009F599 (2) | |
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DUKE POWER COMPANY Powna Buit.orwo 4c2 Sourn Cnuncu Srazzr, CitAntorTz, N. C. 2824a II 7
a g, g wiwAM O. PAR KER, JR.
Vecr PatsaOENT TELrenoNr! AnEA 704 375'ess Signes PnoowCTio" July 1, 1981 Mr. James P. O'Reilly, Director
/ qf, U. S. Nuclear Regulatory Cotcaission jjp N')y Region II f
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101 Marietts Street, Suite 3100 7
8L Atlanta, Georgia 30303 7 9 1981 7 IA pon g' v.5 gAo'*
Re: Catawba Nuclear Station g
Units 1 and 2 Docket Nos. 50-413, -414
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Dear Mr. O'Reilly:
Pursuant to 10CFR 50.55e, please find attached Significant Deficiency Report SD 413-414/81-Ve truly yours, s
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William O. Parker, Jr.
RWO/php Attachment NRC Resident Inspector cc: Director Office of Inspection and Enforcement Catawba Nuclear Station U. S. Nuclear Regulatory Commission Washington, D. C. 20555 9 y'l 8107310342 R10701 PDR ADOCK O'.eOOO413 S
PDR n
e Duke Power Company Catawba Nuclear Station
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Report No.:
SD 413-414/81-11 Report Date: July 1, 1981 1
Famility: Catawba Nuclear Station, Units 1 & 2 Identification of Deficiency:
Borg-Warner Corp., Nuclear Valve Div. Motor Operated Gate Valves Description of Deficiency:
On June 2, 1981, W. O. Henry, and J. K. Berry advised Mr. Art Johnson, NRC of the following deficiency.
Valve 1KC230A failed during dry cycling due to the valve disc becoming wedged between the body guides. Operating the valve from the closed position, the leading edge of the lower disc guide gouged the bottom body guide such that the valve could not be fully opened.
In addition, the pull of the operator caused the upper side of the disc to rotate slightly about the fixed lower side resulting in the disc wedging between the body guides. The valve is oriented with the. stem centerline in a horizontal plane.
This is an active, 8 inch, 150 lb., ASME Class 3 gate valve with a Rotork electric motor operator. Borg-Warner Corporation, Nuclear Valve Division's part number is 76110.
Analysis of Safety Implications:
Valve 1KC230A is used to isolate the essential KC header from the nonessential header during an accident condition.
Failure of this valve to. isolate could result in cooling water flow to essential components being reduced below acceptable levels should the nonessential KC header fail.
Corrective Action:
The valve disc will be returned to Borg-Warner for removal of sharp leading edges on guides and for closing gap associated with their flex-wedge design.
Body guides will be repaired to remove gouges. Other gate valves with cast i
body guides, power operators, and horizontal orientation will be identified and checked for sharp leading edges.
Repairs will be made as required.
Other Duke stations will be reviewed for this deficiency, reported, and corrected as applicable.
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