ML19261F368
| ML19261F368 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/05/1977 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| GQL-1683, NUDOCS 7910250832 | |
| Download: ML19261F368 (4) | |
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METROPOLITAN EDISON COMPANY PCST cFFICE BOX 542 REACING. PENNSYLVANIA 19603 TELEPHONE 215 - 3c9-3601 Dece=ber 5,1977 er m,c8s, Mr. 3. E. Grier, Director Office of Inspection and Enforce =ent Region 1 s,
631 P rk AvenueU. S. Nucle r Regulator Cce=1ssien f
King of ?:*assia, Pennsylvania 19hC6 Dear Sir-Sree Mile Island Nuclear Station, Un; t Operating License No. DPR-50 1 (SC-1)
Docket No. 50-289 II Eulletin No. 77-06 In response to II Sulletin No. 77-06 safety related syste=s. Engineering has reviewed the "E-1 co t i, Metrc Se results of this review are hereby sub in a nmen for Reviev/Cenclusiens m tted.
Containment Electrical Penetrations
- For Safety Related Systems 1.0
"".C-1 does not have any elect i or are otherwise similar in that r cal penetratiens that are G.E. Series 100 drv characteristics are naintained so as te enitregen pressure they depend upon an eperf sealant and a at the electrical and pressure required by the safety analysis report nsu*e the functional capability as lcv vcltage pcver, centrol, and instrume tSC-1 atilices ectric electrical penetrations fer
'destinghcuse electrical penetrations f n atien cables, and eight (3) pcVer cables.
or the Reacter Coolant Pu=p Meter tiens in that,Se DC-1 G.E. penetrations are different the DC-1 penetrations utilice a d(1) the SC-1 penetratiens re notfrc= the of the =cdular design, centainment, ouble seal, wellei inside and cutside of insulated coeductcra pass through the hsuch that noisture cannet ente (2) penetratic.., 2nd are sealed in cast eporf rations, (3) the eader plates at both ends of the inner side Of the header plates (see Attach =ent A) cf the eporf on the with =cc
,renetraticns do not require "0" rings s.1 dry nitre (Li the DC-1 the penetrations, and (5) the OC 1 Oc noritr the integ'ity of the pe penetrations use irvremu e for sealiny' ge:.
electrical characteristics of the condunetraticns and net tc ensure
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ctors are =aintained.
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....n.~~~.- p - ,- e=,cer ,,m - a. , ;p- .J - uc 2:e 3C-1 Westinghouse penetrations are different frc= the G.I. Series 100 penetrations in that, (1) the Westinghouse penetrations do net utilize an eperf sealant for sealing arcund the conductors, l2) the Westinghouse penetrations utill:e a =etallic, cerscic =aterial for sea'dng ar ^. '..d. ' k =. '. t'.e k..d..s s .k.a. a..r a d
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~ --.. - ~ . u.e.,. + - < a., n,. gs. e.+. ..a. e.-...,- -<..e- - ~. ~.a_<. ,.. <., g t..f,..a ( 2., 8, a.ry ...a. nitrogen pressure is used to =cnitor the integity of the penetration seals and not to ensure that the electrical characteristics of the conductor are ..,.<..+.a<..a.. 1.1 3C-1 does act have any G.E. Series 100 penetrations. SC-1 has never experienced electrieni failures of any penetrations. 2.0 As indicated abcVe, dry nitrogen pressure is used only to =eniter the integrity of the penetratica seals. The manufacturers do not specify =aintaining nitrogen pressure for the seals. 2.1 As indicated abcVe, DC-1 does not =aintain nitrez.en pressure to ensure that the electrical characteristics of the conductor are maintained. 3C-1 has never detected any deg-adatica cf insulation resistance er anc alcus cc=cenent operation. 2.2 3C-1 has, en occasien of =aintenance on ec=penents within containment, taken =eggar readings en the cable insulation resistance through the electrical penetrations with no indicatices of deg adation. Also, the cables that are used within the penetrations (G.E. 7ulkene SI and Kerite Cable) are designed to operate upcn exposure to a =oisture enviren=ent without any d.e g adation. 2.3 As indicated in 2.2 above, cables have been meggared en occasion of maintenance on ec=penents within containment. :To other specific insulation tests are perfor=ed. 3.0 niere is no need to =aintain the penetraticu pressurized, and the safetv. a.a7. m J afa.=
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f.'*h a. ".*.',E4_ a 7 a n *. w. 4 a a7 i _ a penetraticns maintain a nitre en pressure of 30 u. sis-for =cnitorinz. z_urposes e cnly. 3.1 Althcugh DE-1 does net use G.E. Series 100 penetrations, the folleving tests were perfor=ed on all penetratiens to ensure that they vill perfo = their ^2nction under LOCA conditions: All penetrations were bench tested at the facecry to ensu e a -avd um a. leak rate of 10-occ/sec. When pressurized to c3 psig dry heliu in an ambient temperature of Tic? as determined vith a = ass spectrc=eter ever apprcxi=ately ten =inutes. b. Prior to installation, insulation resistance checks were made en all cables within the penetraticns. A'ter installation was cc=pleted, the penetratien was pressure tested c. for vel?. inte g ity at lil psig (recuired to ecnfor= te AS:E 2ciler and Pressure Vessel Code Pne'=atic Tes; per paragsph :!UG-10?d, Section 7:: ). 1482 T20
3.~H Grier, Director, 1ece=ber 5, 1977 ._ 1 4va xg a. e.,._1.f au p.4 9 e..w. 4,. q. 5 aw o. -...ade... .w.......4. -~.. m. a* system reta eters to ensure seal intepity s. ~m.4.n..4.~.g .'w.. a. ~. ~.... a d..e....*... e ~. a ad. 'a s . - a?...a.a. *as', v.w..d * .w. ,.o. 4 i .#,,,,4,.,, v a..- 4.".d. d '..". a ~ ... vas z...'.. ed a 4 a ..... e e. -.4./ '. %.. .... e-e.a.a.. a. d. ~...s. z A protctyce of each type of penetration asse=bl .y <..egr<. / n.- .u. y was tested to de=cnstrate yem,,e,.,,.< ~ una ....ema - e.-,.u.e m m.ay4...g ~ ~...~a z. 4 ^ ns -
- esign temperature and pressure (231 ? and 55 psi )
1. psig and 100% relative h=idity for at least 30 iays s ours and 125 F,10 C b. "Once-in-a-lifetime" tenperature and tightness of 2k cc/hr and an alicvable lespsig and 100% pressure transient of 3250F, 32.5 exceeding leak that approx.dmately 5 years life is left. s of insulation life such (:icr=al centainment is 110c? :nxi=u=, 0 3 psig and 0 '"esting conditions simulated er exceeded th - 10C% relative humidity) transients of a LOCA ecndition. e te. perature and pressure designed to have a rsdiation resistance ofAlso, the penetration asse=blies vere exhibit no degradation frc: this dese. not less than 1 x 100 Rads and 3.2 Yes. "'hese measures assure adequate satisfactic regulations. n of the Cenmission's Sincerely, t e G. Eerhein Vice ?residen*. ..vur. ...ue:tas .itt achmen: 1482 121
// Dece=ber 5,'1977 ' / k/VMfn/Y g acr, :n. .s f- //I/ l. ~ / CL & c 7~2 /CA /-. s/Js ?" sed 77 s s.) t GEK-32433 REACTOR PENETF.ATION N0ZZLE e CONTAINENT i WALL h =o I '* FIELD WELD ^ p FIELD WELD i NO. 1 ) o e a NO. 2 l FIELD WELD d g x,. 3 f i i .. p s - b \\l r CUSTCMER Cn. _ m..,.n.. te ,, _- g:s a .,r* c Cn, 3.,.: (o ,,o [3 N',l f o h, * * "-1! WELD RING e n* INSTALLED '-'h o 4 e IN FIELD ef LOCATION OF VALVC~ 'GD CONTAINME.'.T P?2SSUR CC.,,.RE_i.m u g,",~ SHF.LL Figur e '. - l. Typical Electricci Pene:::: ion Assembly 1482 122}}