ML19323C619

LER 80-007/01T-0:on 800430,penetration Cable Splices for Containment Ventilation Fans Found to Lack Documentation for LOCA Qualification.Splices Will Be Coated w/LOCA-qualified Sealant

ML19323C619
Person / Time
Site:	Fort Calhoun
Issue date:	05/07/1980
From:	Connolley J OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19323C613	List: ML19323C612 ML19323C619
References
LER-80-007-01T, LER-80-7-1T, NUDOCS 8005160396
Download: ML19323C619 (3)

Text

. . . . . . . . . .

mm LICENSEE EVENT REPORT 8 0 0 516 03rf(,

CONTROL Blocct: l l l l l l  ! (PLEASE COINT OR TYPE ALL REQUIRED INFORMATION)

D  ! NII IF lC ls II l@lo lo lo lo LICENSE lo InNvMSERlo 10 10 10lol@lhl11111Iil@l I 57 CAT 5d j@

7 8 3 ' 8CENSEE COCE 14 15 25 26 LICENSE TYPE JJ C ON'T l0ltl [e , lL I ol 5 l o f o f o l 2l 3 l c6a@lo I h EVENT l 2 lDATE o l 9 l o @l 75n l l n l c l 3 lnl@ 80 69 74 REPORT DATE i 8 50 61 OOCKET NUMBER EVENT DESCRIPTION AND PACSABLE CONSEQUENCES O'o l o i 21 l As directed by II Eulletin 79-0I3 the penetration cable splices for the contain- l jo,3, l nent ventilation fans VA-3A, VA-33, VA-TC and VA-7D lack documentation on LOCA l g o i4; j qualification. The splices are being reported even though an investigation of l l0;3; i naterial properties of Irrathene SPT tape, Irrasil tape, and silicon RT7 indicate the]

3 ,3 ; l splice vould withstand a LOCA. l l

[0 l 7 l l -. - _ -

l 0 I 4- 4 l- - - - - - -- --

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE .U8 CODE COMPONENT CODE SU8 CODE SU8 CODE ,

loisi 7 3 Lsl 31@ l 31@ l Al@ IE IL IIIC lo ln 18 I xl@ l zl@

9 to 11 12 13 18 19 20 OCCURRENCE REPORT REVISION

_. SEQUENTIAL EVENT YEAR R EPORT NO. CODE TYPE NO.

LE O ae=R/ROsu 19loi 1-1 Io1017l l/l lo li I I Tl I-I lo I 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUT 00WN ATTACHMENT NPRO.4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOO HOURS 22 SUBMITTED PORM byB. SUPPLIER MANUPAC*URER IJJF l@l34z i@ l21@

35 lzl@

38 lc10101oI 37 40 LY_l@

41 I42 n l@ I43A l@ 101018101@

44 47 CAUSE DESCRIPTION AND CCARECTIVE ACTIONS l1 IoIl The sulices hsve no available LoCA tect data. ~'o insm e the eleevice' l

+% =a4 l I1 Iil l trereMies of the- sulice. the srlices both - n en+ = 4 -a=+ aad da -* aa -

j , l2j j rocs (recs 31) vill be coated with a LCCA qualified adhesive / sealant. [

I lt l31 1 I

litai I 80.

7 3 3 STA  % POWER OTHER STATUS Cis RY DISCOVERY DESCRIPTION li is i lg_j @ 1 ,I n i n l @ l NA I I lhiDataReviev l' ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA I I NA i li is 8t Iz 7 9 l @ l z l@l to 11 44' 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION I

li 171 lo l o lo l@l z l@l NA PERSONNEL INJURIES NUMSER O ESCRIPTION It i,1 l o l o l o l@l NA 30 I

7 3 9 11 12 LOSS OF OR OAMAGE TO FACILITY Q iv8E O E SCRt

• TION v NA I 11 131 6 9 Iz l@l10 SO

'V 8 CI TY NRC USE ONLY 8 ISSUED DESCRIPTION l: i o f I z l@l NA 4s l I I l l l l l I I i i i I *:

7 3 9 10 \ 68 69 30 3

~

NAME CF PREPARE a J. L. COnnollev -

PHONE:

Ocaha Public Power District Fort Cnihoun Station Unit No. 1 Docket No. 050C0265 LER No.80-007 Attachment No. 1 Safety Analysis The electrical penetration splices for the containment air handling units consists of an inner surface of GE Irrathene SPT tape to provide a smooth taping surface. Over the surface is applied a 1/h-inch layer of the Irrathene SPT tape extending 2-inches beyond the penetration insulation and 1-inch over the cable insulation. Over the SPT tape are placed 2 half lap layers of self sealing GE Irrasil Sillcon Rubber tape which extends to the seal nut on the penetration en0 and 1-inch beyond the SPT tape on the cable end of the splice.

GE RT7 Silicon sealant was used to seal the final end tabs of the-Irrasil tape. An overall layer of Scotch 33 tape was installed on the entire splice. An investigation of this splice indicates that its ,

composition would allow it to withstand the LOCA conditions.

The SPT tape has an allowable radiation limit of 10TR Ond has out-standing resistance to steam and hot water as stated in the 3tandard Eandbook For Electrical Engineers" tenth edition. It also has excellent resistance to acids. The outer layer of silicon tape and RT7 end tab seal has a radiation resistance of 10 R 6 threshold and 107 allovable respectively. The silicon tape and RT7 exhibit good high temperature characteristics and chemical resistance. The overall Scotch 33 tape also has a high resistance to radiation.

It is the Districts judgment that since no test data exists on this material, additional =easures are required to insure the operability of the splice. To acecmplish this, the splices vill be coated with Dow corning 31h5 RT7 adhesive / sealant which is LOCA qualified. This will prevent the LOCA atmosphere frca attacking the splice insuring that its electrical properties ra-ain unaltered.

The docu=ents used in this analysis were located on April 28, 1980 and vere not available for previous investigation.

l l

s.) < l L

I

1

! Cmaha Public Povar District

Fort Calhoun Station Unit No. 1 Docket No. 05000265 i LE No.80-007

! Attach =ent No. 2 1

i f

Failure Data 1

Other splices with this potential problem where previously reported under LE 80-06.

i 4

)

i 9

i .

I i

l 1

s l

l e

8 1

{

t T

s 4

ft

.. r . _ , - _ . _ _ . . . , _ .~.,.f_-... , , , _ , , . __.._ ., .,, . _ _ - ., -. . . . ,e , -