ML19338C632

Significant Rept SD 369/80-11 Re Valve Operator Orientation. Review of ASME Code Class 1,2 & 3 & Util Class F Valve Power Operator Orientations Revealed Several Valves Erected Outside Design Tolerances.Stds Being Revised

ML19338C632
Person / Time
Site:	McGuire
Issue date:	08/11/1980
From:	Parker W DUKE POWER CO.
To:
References
IEB-79-14, NUDOCS 8008180317
Download: ML19338C632 (2)

Text

O D t:x E POWE R COSIPn*Y PowEu Dt ituiso 6.: - Sot; Tit C a ruca STurzt. CILAHtOTT E, N C. 29242

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3,,. c ,3 August 11, 1960 Mr. James P. O'Reilly, Director U. S. Nur. lear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Unit 1 Docket No. 50-369

Dear Mr. O'Reilly:

Pursuant to 10CT" 50.55e, please find attached Significant Deficiency Report SD 369/80-11. .

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Ve,ry truly yours, ,k e

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<tuhg" Willian O. Parker, Jr. y LJB:vr Attachment cc: Director Mr. T. J. Donat Office of Inspection & Enforcement NRC - McGuire Nuclear Station USNRC Washington, D. C. 20555 '

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DUKE POWER COMPANY MCGUIRE NUCLEAR STATION Report No.: SD-369/80-11 Report Date: August 11, 1980 Facility: McGuire Nuclear Station - Unit 1 Identification of Deficiency: Valve Operator Orientation 7 Description of Deficiency:

On July 11, 1980, Mr. J. R. Wells and Mr. D. F. Mitchell reported the following deficiency, by telephone, to Mr. McFarland of NRC, Region II, Atlanta. As a result of IE Bulletin 79-14, a reviev'was conducted of ASME Code Class 1, 2 and 3 and Duke Class F valve power operator orientations. Several valves were found either not erected within design orientation tolerances or valve orientation was not shown on piping drawings. In some cases, installed valve orientation is not consistent with orientation used in piping system stress analysis.

It was found that portions of sevaral systems erected before Duke valve inspection standard MDS-ES-28, dated November 3, 1976, was developed were not reinspected according to the standard. In addition, manually-operated gearbox valves had never been inspected for any piping system as MDS-ES-28 did not specify this inspection.

Analysis of Safety Implications:

Discrepancies between installed and stress analyzed valve operator orien-

, tations could result in erroneous or increased stresses at locations in

! the piping system and invalidate the piping stress analysis. Revised stress analysis could result in changes to piping hanger locations and

design loads. In addition, increased valve accelerations could exceed manufacturer allowables for valve qualification.

Corrective Action:

Duke valve orientation standard MDS-ES-28 was revised to include inspection of manually-operated gearbox valved. All of the subj ect valves shall be reinspected if not previously inspected to MDS-ES-28, in addition to all manually-operated gearbox valves. Based on this inspection, piping drawings shall be revised to reflect the "as-built" valve orientation and l a revised stress analysis shall be conducted where necessary to determine the effects of any discrepancies on piping, hangers and valves. Changes shall be made to the piping system hangers as necessary to qualify the piping system stress analysis requirements. The above corrective action should be completed by September 9, 1980.

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