ML20094N213

Staff Exhibit S-18,consisting of Ltr Concerning 870721 Request That Vendor Provide Justification of Continued Operation for EQ Solenoid Valves

ML20094N213
Person / Time
Site:	Farley
Issue date:	02/12/1992
From:	Gandi K BECHTEL CORP.
To:
References
CIVP-S-018, CIVP-S-18, NUDOCS 9204060220
Download: ML20094N213 (20)

Text

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[,' @- 3 t/7 36f. -d/ M Staff Exh.18

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/ fM COLn[1tD USNRC

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T2 na D Pl2FBechtel Eastem Power Corporation gn y ut.toAP DGlasers - Constructors ,

DO C M M G & 'l " V1'1  !

rete 15740 Shedy Grove Moed Gaithersburg, Maryland 20871 1454

• ~ " '5Ut 2158f In reply refer to AP-13'.69 -

.  :.. R.s . . . . . . - _

s Mr. W. G. Eairston, III-'

Alabama Power Company 600 North.18th Street '

Post Office Box 2641 Birmingham, Alabara 35291-0400

Dear Mr._Hairston:

' Joseph M. Farley Nuclear Plant Units'1 & 2'

' ~

Dechtel Job 7397-011 EQ Solenoid. Valve Splices - Justification for Continued Operation Bechtel File E-91 AP-13169 In a telephone call on July 21, 1987 APCo (Mr. J. E.

Garlington) requested Bechtel provide justification of continued operation for EQ solenoid valves which are deenergized to perform their accident mitigation function, and for EQ solenoid valve coil pigtail splices (terminations) located in the Main 3 team Valve Room.

The requested justification for continued operation is attached.

If you have any questions or comments, please contact us.

Yours very truly,

[ M K. C. Gandhi Project Engineer KCO/AJD/DGBarah Enclosures l As stated above l- cc J. R. Crane, w/1 l J. D. Woodard, w/1 l J. E. Garlington, w/1 R. G. Barryh111, w/1 9204060220 920212 L- PDR ADOCK 05000340 l- O PDR ,

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g Attachment 1 to AP-13169

Subject:

Dra2uation of potantial defiele6cies in pigtail splicas (terminations) used for Safety Related Pilot Solaroid V41ves in the scope of the

( Environmental Qualification orogram.

1.0

Introduction:

An evaluation has been performed to addrass two

) potential cor.cerna. These concerns arn

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-The safety'2triction and associated position indication of ale operated valves with p41ut 1

1. sulencid v43ves that are deenergized by the l automatic actuation signal (e.g. Safety Injectiua, '

Contrinment Isolation, etc.) The applicabla solenoi? valves tra listed in Appendix A.

b. The v3fety' function and kssocie.ted position indi:stion of air operated valves with pilot solenoid valves that are located in the main steam x valve room and. are energized on the automatic netuation signal (Steam Line Isolation) . The applicable calenoid valves are listed in Appendix A.

• 2.0 ?aalynia

c. Air operated valves with pilot solenoid valves -

that are deenergized by the c.utomatic isolation signal. 4 h typical schematic of a safoty related air operaten valve which han its pilot solenoid deenergized fo11o91ng an automatic actuation signal (see Figuru 1) shows that both current patho to the solenoid are interrupted. The direct )

path (path 1) is interrupted by the control switch convi ct 1A and the seal-in path (path 2) is h interrupted by the contact of the aut omatic 1 actuat3cn signal (1-K605 contact 9-10, which opens). As a result no .;urrent path can be "

establishes regardless of e.he cend zion of the solenoid pigtail spiaces (terminations) . It la noted that no other splices are present in the condait splices.

systnm that containn the solencid pigtati

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' she's a ' current h(ath cannot bp established the solenoid 'witt remain doenergited.

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postulated splice-gabit, (e.g. short circuit)Further, at the,any . '

inhication cicait since thers isoann no d Affact the function ~of the h\ ' ap'ilabla'. <

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- A typical -.rangwnent-used for providing electrio6, conduit and.$ unction boxes necessary for tantinating the centrol wirin'g to the environme ally. qualified solenoid valves located ,

- in she as@ti.a steam valve rotse is ohown in F -

. The: solenoid valve coil is provided with qualified pigtail conductors which in some instances, may not ,

oe of sufJicient length to reach the solenoid ~

valve junction bcx for termination to the 0 qualified field control wiring. It is suspected that in theet cases, qualition slagle conductor  ;

(12 AWG (Cable Code 402, JA2) was

- spliced / terminated.usin Figure 3. .The er ice (g a detail similar termination) to tocoil the

. pigtails is contm.ned in a conduist or small ,

4 juncties box located la the conduit run between ,

valwsolenoid the body conduit valve entrance.

junction box and the solenoid As shown in Figure 2, the solazoid pigtail conductor, the pigtail spliew (termination) when used, and the field '

control cable and terminal block ter.44nat$ons are%

nnelosed sys t,em. in the conduit and junction box raceway '

The design basis accident environmental and flooding effects' postulated to occur in the main  ;

i

. steam valve room are addressed in FSAR Appendix

?' ~3K.4.1.1.8 and 3K.4.1.2.7. As shown in U-416797C <

and U-4167S$D, all envirominentally qualified i scienoid are re valves'in system N11,- W12, nnd M13 whiot mitier.quirsd to be energf. sed for ace 7. dent -

tion and their associated junction boxes t (condulets) above the ma,xfcnum postulat9a flood level ofcoduit and fi n ,an nn.er _ , , , . . . . . _ . - . . - _ - -

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alevation 130' 5'. AA shown in FSAR Appendix 3K, i' Figures E-lh and 32, the postulated worst case l 1

tamparature and pressure transient conditions predicted for a steam or feedwater line ru'pturs i are mitigated in less than two seconds witA  ;

resulting predicted steady state temperature of i y 212 Y and pressure of 15.8 psia, The atterials and construction of the subject

.. spl$ces:,at Tarley Nuclear Plant are espected'to be thle to withstand the conditions previously deceribed as discussed below.

.7 ..

Okonite T-95 tape is rated for continuous use at 90 C >

(194 F) and amargency use at 130 C (266 F) .

Okonite product data sheet indicates that T-95 can be used at.130 C emergency duty for five IOC hour cycles without. loss of physical and: electrical integrity. -The solenoid soil cAccuit carries 1sta

• than 0.5 nepere and conductor / splice is likely to '

run well below 90 C 1lJait.

Okonite test report NORN-3 Rov.1 documents acceptable qualification tests parformed on 5 KV in-lin, splicos using T-95-tape for insulation and T-35 tape for jacket, splices were subjected to

.LOCA/EELB temperatures in exceps of 308 F for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.

Wyle test report 17859-02 casted V-conkiguration splices with T-95 tcpe for insutstion & T-35 tape for jacket with no Ansulation tape in the crotch.

J '

All specimens except one passed LOTA/HELB test a

with peak temperature of 360 F. The failure of the specimen was attributsd to likely fi ghover to enclature ground due to accumulation of cNemical 77 , ,

spray at bottom of test e,7 closure.

3.0 conclusions

a. Air operated Ealves with pilot solenoid valves '

that signal.

are deenstgized by the automatic isolation The solenoid coil will remain deenergized and the position indication will function as designed on an automatic actuation signal regardless of the condition of the pigtail solenoid splice (termination).

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'- - b. Pigtail splices-(terminations) for solenoids that are energined:on receipt of an automatic actuation signal-and are ph steam valve Room:ysically located in the Main'

' - As indicated above, the T-95-tape has been- .

qualified to more severe environmental temperature '

than' anticipated to occur in the design basis condition for.the main steam valve room. From ..

qualificatwn testing a similar V-splice' conduct'r o l' configuration, the only failure mode observed was due to an- assumed flashover between the crotch of:

the splice and ground during.LOCA/ EEL 3 testing -

where.the test specimen was exposed to chemical - -

sprays. ' Due tolthe enclosed configuration of the 4 i

V-splice located-in main steam valve room at Farley Nuclear Plant Units 1.and 2,.and_the short

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duration and.nat're-of-the u worst case anticipated transient conditions,~it istvery unlikely that- 3 sufficient moisture would exist to cause a failure of the splice during. accident-mitigation.

' Therefore the required energized state of the sole'noids 'and the function of the position -

indication will be~ maintained.

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