TXX-3527, Deficiency Rept Re Orifice Plates Sizing Outside Specified Tolerance,Initially Reported 811217.All Orifice Plates Affecting Plant Safety Will Be Procured from Different Supplier.Corrective Actions to Be Complete by 820901

Deficiency Rept Re Orifice Plates Sizing Outside Specified Tolerance,Initially Reported 811217.All Orifice Plates Affecting Plant Safety Will Be Procured from Different Supplier.Corrective Actions to Be Complete by 820901

ML20054G433
Person / Time
Site:	Comanche Peak
Issue date:	06/11/1982
From:	Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, TXX-3527, NUDOCS 8206210550
Download: ML20054G433 (2)

Text

. . .

7 TEXAS UTILITIES GENERATING COMIRNY 2001 IIHYAN TOWEH + DAI.! As.Tr X AM 75201 "l $.5$'YL7 June 11, 1982 TXX-3527 Mr. G. L. Madsen, Chief Reactor Projects Branch U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos. 50-445 Arlington, TX 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION ORIFICE PLATES SUPPLIED OUTSIDE TCLERANCE FILE NO. 10110

Dear Mr. Madsen:

In accordance with 10 CFR 50.55(e), we are submitting the attached report of dCtions taken to Correct a deficiency re9drding orifice plates supplied outside tolerance. We had previously informed your Mr. R. G. Taylor of the deficiency and submitted interim reports TXX-3449 and TXX-3491 dated December 17, 1981 and March 10, 1982, respectively.

Supporting documentation is available at the CPSES site for your Inspector's review.

We anticipate completion of the corrective action by September 1,1982.

Very truly yours, R. . Gary RJG:med 3$@ {I4lli.,

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Attachment I  ;

cc: NRC Region IV - (0 + 1 copy) M

[ l-W Director, Inspection and Enforcement - (15 copies) c/o Distribution Services Branch, DDC, ADM.

U. S. Nuclear Regulatory Commission Washington, DC 20555 m

$5ME8ERo?888si, PDR

V' l TXX-3527 June 11, 1982 ATTACHMENT ORIFICE PLATES SUPPLIED OUTSIDE TOLERANCE DESCRIPTION OF DEFICIENCY In 1979, the Supplier calculated the shape of orifice plates using a computer program specifically prepared for CPSES. The program utilized data sheets identifying flow, temperature, line pressure, and required Delta P as issued by the A/E in accordance with the Technical Specifications. These activities were subjected to design control measures specified by the Supplier's quality assurance program. The orifice plates were manufactured accordingly.

In 1980, the Supplier elected to perfonn future calculations using a standard computer program. In 1981, when requested by the A/E to re-verify engineering calculations, discrepancies resulting in plate sizing outside specified tolerances were chsarved. Input parameters were not altered.

Subsequent review and audit of Supplier activities indicate the order for the orifice plates was not processed as a " nuclear" order. The orifice plates were not manufactured in accordance with an established quality program.

SAFETY IMPLICATIONS Had the deficiency gone undetected, local process instrumentation would output incorrect information to the operator such that violations of the technical specifications of the plant could occur.

CORRECTIVE ACTIONS The orifice plates manufactured by the Supplier have been identified as nonconfonning and dispositioned as scrap. All orifice plates affecting plant safety will be procured from a (different) Supplier and manufactured in accordance with an approved and established quality program.

DATE OF IMPLEMENTATION Procurement activities are established for the replacement orifice plates. The delivery of these items is anticipated to be complete September 1,1982.