ML20205K811

Trip Rept of 860219 Site Visit to Examine Problems Re Improperly Installed Cable Splices Used for Bunker-Remo Electrical Penetration Connections to Field Wiring.List of Attendees Encl

ML20205K811
Person / Time
Site:	Comanche Peak
Issue date:	03/06/1986
From:	Chopra O, Chopra P Office of Nuclear Reactor Regulation
To:	Rosa F Office of Nuclear Reactor Regulation
Shared Package
ML20205K815	List: IA-86-270, Trip Rept of 860219 Site Visit to Examine Problems Re Improperly Installed Cable Splices Used for Bunker-Remo Electrical Penetration Connections to Field Wiring.List of Attendees Encl ML20205K811 ML20205S266
References
FOIA-86-270 NUDOCS 8603130290
Download: ML20205K811 (6)

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('D ECT: SL"ADY 0F SITE v!Sti HEtn ON FFB,19, 14c6 AT '

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% u d'r W ned alocq with . lose Calvo and Ed Tomlinsor 0 8 Plart.. Electrical, .

'ns'rucentatton and Control Systems Branch, nivitinn of PM Licensinq R, con-dur'ad a sita visit at Crwaanche Peak Station at the recuast of Vincent Nonnan, F Dir*tter, n4vition of PWD Licensing.A. Proiect Directorata 85 .T** Durposa nf toi t trir was to esatine. problems related to improperiv vendor-installed >3[

ji' and field Installed cable splices used foriBunker-Pmo plactrical penetration cennections to field wiring. These apnarent problems were discovared by . <: -

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Centon IV as a result of their irspections at Cnnanche Peal Statice. dI Enclosure 1 sumarizes what we observed during' this site visit ard tom tt fies j the areas of ;oncern and nur position on these issues to anture that the electrical penatrations at Comanche Paak will perfortn their function as J{

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FERRUARV 14, 14F6 er A site visit was conductad bs Om Chopra of EICSB, Division of PWD Licensin.q-A along with .fose Calvo and Ed Tomlinson of Plart, Flectrical. Instrumentation . -

and Control Sys' ems Branch, Division n# PWR Licensino-R to avarina apparent problems with factor.y installed as well as field insta11ad solices for Runker. "

Remo electrical penetration connections to field'wirino, inside and outsida containment. The deficiencies in the cable splices were discoverad by Daqion- ~

r IV as a result of'their inspection activities at Comanche Peak Station. The following sumnarizes our findings and proposed resolution of the problem. .

Field wiring connections to the electrical penetrations conductors are soliced ,

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twice for all power, control and instrumentation circuits inside as well as out-

side contairments The vendor-installed splices are with'in 17 inches of the electrical penetratine assemblies (EPA) and the field splices are installed -

in the raceways at a distance of_ approximately 6' from the EUA. Cable solices '

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in the raceways are prohibited by position C9 of R.G.1.75 because they have '

been identified as the' initiating cause of several fires in raceways. The- -

Comanche Peak design is inconsistent with the recormendations of -this guid*,

It is-not clear at this point why the double splicing became necessary.

Possihiv the field cables were not long enough to terminate at the EPA or tha vendor did not supply long penetration conductor pigtails for field connections.

In any event this situation is very unique and certainly not ocod encineerino practice. .

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I At the site we spent considerable tirw* with Region IV inspection team discuss.

[ ing the use of cable splices in raceways. improper 1v vendnr installed splices, }

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.q J installation, and incomplete environmental qualification documentation, g I

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q As part of our icint walk-thru of the containment penetration areas with the

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.3 f Pegion IV inspection teem, we round that a) several cable solices in racewivs &

!^ ' .were inadeoustely installed in that both ends of the splices were not proper- 3

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yQ ly sealed, b) the cables with solices were not proper 1v routed, c) the splices h were not staogered within the racewavs (splices were stacked on too of each -

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.other), and d) the factory instailed cable 501(ces were also not proper 1v sealed

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and.in'some cases bare conductors were visible.

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A tased on our perception of the problems observed during our site visit we cob . g.

i civde that many' installed cable splices at Comanche Peak Station are inadequate. ~

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.The deficiencies in the installation of cable splices could result in failure '

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[i of Class IE equipment essential to the safe operation and shutdown of the i

plant. . The potential failures which could occur include electrical'short cirp 2

.cuits, localized circuit overheatino and circuit discontinuities. ,

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Althouah double splicing of field connactions to penetration conductors is not 1 j

a moreal practice and cable splices in'talled in tha racewavs is inconsistent j

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,i t i wi'.h the recommendations of R.G.1.75 position C9, we believe that 'ine work- y:

nanship, use of qualified materials, proper installation proceduras and cali- '

brated tools should provide a solice tha* could be as good as the original F cable. Therefore, in order for us to eccept the use of cable splices in the '

raceways, the applicant must develop a program to inspect all solices (field _ Av

. i-as wall as factory installed) located inside and outside containment for 1 connecting field wiring to the. electrical penetration conductors.

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If~the cab 1e . .

, solices are determined to be improperly installed, he should initiate replace ,

ment of such solices. Howev$r. such replacement must be. supported by documenta M

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i tion containing the results of qualification tests conducted to support these I corrective actions. This should include appropriate environmental c'ualifica-1- , -

tion,as well as electrical continuity tests, s r -

solices which dre, ,

! determined to be acceptable. the applicant st r de documentation of~en- '

virr,nmental qualification. inspection and installation'and electrical continu ~ g' ity tests results. For added assurance we reoutre -that the cable splices of' all medium voltage and low voltage must be capable of carrving rated continuous : . -

current prior to and following rated short circuit current without the terperature of the splice exceeding the temperature of the conductor.

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