ML19323F742

Final Deficiency Rept Re Electrical Penetrations W/Incorrect Blinding Pin Installations in Plug Assemblies.Assembly & Insp Procedures Changed.Proper Blinding Pins Will Be Installed & Inspected

ML19323F742
Person / Time
Site:	Summer
Issue date:	05/22/1980
From:	Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO.
To:
References
NUDOCS 8005290419
Download: ML19323F742 (2)

Text

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y 22, 1980 C. S. Nuclear Regulator / Cor:iission A::n: Mr. L ees P. O'Reilly Direc or Re, ion II lu 212riet:a Screet , L' A:1:nta, Georgia 30303 Subj ec t: V. C. Sumer Nucleae Station Unit 91 License CPR?-94, Reportable Ite= in Accordance with 10CFR50.55(e), i Electrical Penetration Blinding Pins l

Gentlemen: I l

Cn April 30, 1930, :he Ragica a Resident Inspector, h: k Skolds, was ,

n2:ified of a raportable iten r .2 ding el'e::~ical penetrations with incor 2ct' '

blinding pins installations 1. a eir plug assemblies. Ihis iter: has recently l been assigned NRC Repor: No. 30-393/30-la-02.

I Nature of Condition 1 Derring an SCE5G program of verifying plug engagement in electrical pene: rations utilizing radiagraphy, it was determined that some plugs had incorrect blinding pin installa:icas. In particular, some had wrong size blinding pins, so=e had no blinding pins, and so=e had male adap:ce pins installed where there should have been blinding pins. The condition resulted in a site Nonconformance Notice (NCN 1006R) which documen:ed the condi: ions and provides a mechanis:2 to disposition, and to t. rack the cor:2ctin accians to completion of rework.

Cause Tha caus2 of the canit: ion was a combination of 7:a.:edural and implementation caissions. Ins:ructicas for plug asaeceiv previded by che vender did net specliically tidren b unl:ccm pin us ta chan racuirad, siza r2 qui 2d, e:c. Vend 7 drawings did c.ddrcsa Siinding pins

%!ag recuired in caaled plugs by note, houever. L.hn procedures vera pr:: pared- for asse:bly plugs, the instructiona provided by the vendor sere heavily u:ilired and drasings waren't giv.>n as high an j exchasis. As a r2sult, the 3.ssen'aly and inspaction procaduras did net Ol s

/O 8005290 M/f

Mr. Janss ?. O'Fsilly .

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• li2y 22, 1930 -

specifica*ly address blinding pins. To compound this e rrr, inspection

. i personnel never pursued the drawing note sta:ing that blinding pins were to be installed, and never questioned the plug sealing aspects during 3 inspection of the plug assembly procesa.

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Safa:v Inclications The safety inpli:2:icns of the condition is that it could have -

resul:2d in a line to ground fault that could possibly d:rnage the panecra:icn and braach c:ntainnent during the postulat2d'I.CC1.

Atticas to Corrne: Candi: ions NC'; 1006E has-been dispositienad to have plugs with blinding pins inspec:cd, have the proper blinding pins installad, and have the ra:installa: ion properl/ inspected. Tna UC'! disposition coctains detailed instrue:1:n3 as to the plugs involved and =eth:ds to install and iaspect blinding pins.

Corrective Ac:fons to Prevent Recurrence Procedure changes dealinT wi:h bibding pins.12 elect:-ical penetration plug asaecblies have been nade. to pr: vide sp.rcific verification and QC inspec:or sign off that installation is correct. Taese actions are believed to suf fice in preventing recurrence of the specific condition with respect to electrical penetra: ion plug assemblies, although no further work will ce done in this ar:a af ter the rework recuired by MCN 1006E. In addi::icn, 21actrical QC supe: tision recognizas the need to be note thorough in rasearching vendor requirenants in areas new to SCE5G to provide adequate work instructions.

SCE5G believes ac: ions outlined above vill adequately resolve deficiencies in electrical penetration plug assenblias. Since all necessarv actions have baen identified and ara in the process of being inplemented and tracked via

':CN 1006E, ua consider this 2 final report on this subj ect. All actions taken regarding this iten vill be atrailabla at the construe:ic, site for NRC reviev.

, SM uld furth3r inforna:i:n b re:uirad, please con:.:t us.

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, <01c 2 ci Director Ins ection & Enforcenen:

Mashin; tan, DC 20535

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