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TENNESSEE VALLEY AUTOIUPIRO REGI.:;N coirAmmmOOA. TENNEDUE 37401 &'L AN4TA. .

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80tobm'219 14AICT23 Ago:38

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W'. JmI. OResilly, Direst,, Offift of Iaupwtim. bftroumtU.S. fteel. ftulacmyCils Regiai U - Reit. 3100 101 ftrltta St~e Atleatat Goem'51 30303

Deer or'. O"Reilly:

WM3 SU WZI3 PUNM U II M 2 - MNAA?3 OMD mwD-50.390/S1-Siv UUD-5-39t/si-75 - FIUL 31W?

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The ambject defleimy -s Initialy wsarted to or,=O~ rampetor I. Y. CrlinJak .u Septsebw 21, 1981 in saseodama with 10 Ci 50.55(e)

Ms CP 29033 21. bsnasad is ow fUml iewpot.

If Yaw bs* WkY queettcss, pAtSM pt In tauh with 3. ff. ftll at

IF." truly F".81,

~TIEI5S YSU4Y AWAINDUI

L. N~I~4 ri ft~w65

ft: Mr'. file" Stello, DLIreot (lw~umla') Or is. of Iimmuen gal safaresagst U.S. awler Issmutory Camlssics

I anqt= , DC M05M

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An Equal OppowfunitV Employe

AM

ATT3SO 90=1IU PTANYtET I AND 2 IA- 201CABLE I 3 '3 ' UD5-390/81-819 UID'5.39i/61-TS

10 OR SO3(e) VDBL. nw

Description or Cditmi

Cable cnnectios we made Vbse field cables isterfto with cable "plgtails at electrical peaetrations thmoqb prim 7 omtaii~mt. in eas amass the amble conmeations Involve differet SIMe of cables (field amble vesus Pentration amble).* Cable ooniictiom (Spliced, bolted or piue oa0MUMtiN) an cables rated 600 volts or leos, are Insulated with laychm! CarOMationS VMF typ 5 beat abridable -..

sleeving. This sleeving has been tested -f has passed the stuLanards for type testing Of Clss 113 electrical cmblems field gpliam, and connections for woleer PMnu pueratLAg statios (INS 383..1974 anm I=K 323-19'T4).

Before may 15p 1960, Class a camble connections at Vatte Bar Nuclea Plant Were made acording to the construutiei Procedure developrA from general design and vendor Instructions. it has been deterajiud that these amble connections umt wot insulated wit.h the minim. 2-inch Ovrap I"Or sleeving onto t~he primary insulation an each side of the camble interface. In Soaw cgses, Pert Of the miniwa 2-inch overlap mes installed over the outer cable Jacket rather than the primry insulation as required. In addition, auttricient izafouutior wa not Provided to Coantruction with regard tc camble preparatimn wenrcsa.1e shimming reqiiremeta to wmni' that the vendor's installatton

racomndtions (as a mas-It of juallficiAtion testIng) *efwe mt.

Safaq ,fIlicat'.ons

If Vli3 det'licacy iLad resainod maworrected it couLd Java, Mused taw~ failure Of safet4-rM1t'atd systsi inside primary containusnt duAir!nS sAcident, condftions. Faj:Vure of these sytemg rould aowgrgely affact the safety at oper tions of the plant.

Corrective Lotion

TO prevnt recurrence of this condition watts Bar construction procedure kF1422 (SIP field Instructions for Termlinating Cables on Primary Contains~nt 9lectrical Penetrations) has been revised (Revision 1) to include sufficient Information to ensure that the vendorts installation reOccnenations are met, rn addition, electricsl standard deawings have been Issued to provide detailed requirements for amble splices and connections.

All class It cable connections am*d before May 15v 1960, have .been reworked to conform with the requirements of 311422 RII and the abOVe-umIntioned electrical standard &swvings.