ML18087A951

Forwards Addl Info & Clarifies Several Items in 830228 Ltr Re Reactor Trip Circuit breakers.DS-416 Circuit Breaker Adequately Qualified & Will Perform W/High Degree of Reliability

ML18087A951
Person / Time
Site:	Mcguire, McGuire
Issue date:	03/01/1983
From:	Tucker H DUKE POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8303090148
Download: ML18087A951 (2)

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• D't1mit PO\\'=ER-* CJ0MJR..~~

P,o.*.Dmt 331M *

~.... N.a.~'2.

M:arc.h"'.1-.. 1:98.'.J

.* Hr. Harold: R. Den.ton.,.. Di"t"ector Gf.f'i'ce of* Nuclear R.eaetor Regulation*

U.. S. Nucl..ear Regul?:.toey * ~i:mii'ssicn-

. Washiri-gt.on,.. n**. C. 20555

• At:t:ention~ Ma. E. ~- Jtdensem._ CM."ef.

Licensing B~anch NQ~ 4 Sub.f~ct:.. 'Mc:Gu:Lve. lfaclear Station, lJM.t:s* l ~cl- 2.

l)oc}{e-e* Nos. 50-3"69*,.... 50-.l:ZO*

Thi$: letter. :Ls. t:o pr.o\t.i"de aaiH:t:funal* *inC~tioi'r.* ie-. response to NRC' Staff qoos.ti~ns* arid-' to* cla't'ifY* several* U:ems in- my let:t'.er of. FeErnary~* 2&,. 1983

• On*. the riiaet<ri' trip,; circuit breakers-* A"ttachment* l*. ~(i'M:aH:ls t<lii~: add! t'iona.i .

inf o.rma ti en**

l"-1-eaB"e ad'l."ise- if there irre addi:tio:11a:t. q_ue.stiOns. re*garfil.~ ..tiii"s* tne.~t:er~

• Very: truly* y.oc!rs,..

CACfr/fiP:.

Attachment*

cc: Mr. W-:. 'T. Grde?'s tmc Senioi:= Resid"ent tnspec"Eor MtG"u1~e.1'Li:eldear Stat.ion.

Mr. ..lames P - o-'lleiil)* ~. R'1g1onal* Adm:inis.t:rato'l' tr. s-.. Nut:lear Reg_t£.latc..ry. Commission" Re:gien-I.I lt>l- Mari-e-tta Street.,.. 1~.. SUi'.te 2900*

Mlllnt.a**.: Ceor~a~ *30303 ., -- .

• ff~0-~05<..Q \>I h.

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. HcCn:tre Nm:lear Stat:i-cm.

M~itic0a:l. !nfonnaei-an.'oi:io Reactor tril!'-' Br.ea:ker.~ ... - -; .

~th* M"CCaire tlJ)"it l- a-ntf: UM:t 2 liar.!!" Yestiu,g1\ouse 'fyp.e 1'lS~416. rl'r'ctait ~eat:ers.

• installed- as* re:acto-i:: ~ri'p-b"I'ea-ker-s.. O.u. ~it 'l'.,. tesr:tng* of t-~e.s.e- breake~.$.. h-as*

been. performed in** aecoE'dan.ce- 'Wi t:h* tile techn-;kal $p-e"Ctl':featians- a~d* no. f.aJ;,1ur.es .

. have b.een* ol;;se~d .... nils-* testing. 'in1;lude:~ 1)" bi;.+-moDt.hly* trip- tC?r;ting* of .

tne* breaker. utilidn~.- the umfet:Vo-ltagit i::nil** anc:t.**assO"ciate<l trip-*inech'tlnfa~ and-:

2} triP,- testing of the* ~eaker dur.inz- tne. engineeJ::'ed:* satr.ety. feature.. {l!SFl and. reat:t~~ .pi;ot:ect1on. systehl QIBSl t.ests. every* 13' 1n~h:>-.. Jid~tf.ona.Hy,,

alt:hou&h'. not -req_~red-: h}~* the tec:h.ni:'cd spec::tfiQations* fo-r 't!ni"t:. l~. liesti'n& (ti . ~"

the shmrt. t;riJ?*'coi-1 :fa also- perf.ormed** dm-i~g E~iRP:S: testing* every-18'* mon.ttu~*...

on: Unit Z during. preoperat.i<tnal testing o£ tlle RPS",,. the. b.Rraker.* iPtatus- :tights in* the contr.ol room indicated' that one breaker di:cf not open* ~on. t'E.H!clpt of a td'p sig;:m1. Subsequ2.nc imres.ti~ion.* sholo.'I.?~ no apparent: ress.on- for the-* f.s.:ilt:are t:o tJ::.ip* an<l. in. su.bseqa,.ent testi-ng the:*. ti.real\~ apen,el]: a.s: r~~i-red *.

Pr:fo1" ~o. iri:tttn* cr.1ti¢alit~**** aad-ftfoa&i t:est.filg- will be .. perrorined.* ~o ass~re*.

that: an* the te~f\1\-icxl. specifica:~icn r-eciu!"rernents* are* met:~ ~1'en. tlia. ~t

• i.

l:tc.-ett$e* is i"ssuad:, tfie technicat speci!i.cat:ions ~ill contain- a!i of: tfze* *sa-me-:

req,~f:ni:umt$" as:- the* current- llnit l Technfea:l--$\>eci"f*i.e:a:t.i:ons-. and ... ih:. addd:tioo.,.

\dl*l co;,tain- toe req'airemet!_t: to R~fo~ .. testi~* oo* "the s~ trii" co1'1 every 18* mondiE>.. T.estf.ng t;f" tfle Unit;. z* nr-ea.kers WGS. la$t .:p-ei-forpie4- on* Feb.ruary 25:.,

- .. .. *-. -. *- . -.c.

l~J..

As ~oted in. -tt~e* hbrusry*. 2Et~- I.9Etl' fon*er., the r~~ -tr.flt- t;.r.~p: .. &te *safer;y,-

rela:t.ed de'\?f:ces. Al1. tesdng* aw* maintens:nee* eei::lvitJfe~ are perfoi.n:med' us-ing

.t£P:Proyed* p-rocedures - !'he maintenance ~rocedtrre* for.* tbese M-eaT;:er.s consi*s:ts of

. 1b$pectio~:* cieani~*,. repair :OT- rer.l~cement.. (-as nef!essal:y-}.- cf o~aKe\6 ClOmpommts-...

This: sa;1~e- pr-oced:"ure a!so r.eq¢rres bo-tt'"* an. elei!t:r!cal. *andi a. inecha:ni.ul test. of.

• th-e* trip f uri.ct-i()n -of. t;*he tl.re:aker upon:- complet:ion: of. md.t\t:Go.t\'Bnce.. ~$'e "tes£s fim<e been~ don~ f-or* 'Dot:h* the. W and" shu~t t:d.l'J ct~ice:$- E!¥Eln: tfio~gh... the pY.oced'i.<<e.

es:* not; spe-cifi"ean1~' Te'}mr.~ that 'fi.nt:h~ trips 'be- tes*t*&iL,.." The P.X'Qeedu?'e m.11 *

. "oe- rev.tsed: t.o -require testing.* of °f)tttll*. tir.i:'p funt:tien"Et af*te~ toaint:~nca.

Mhint.enance- i-s.. pedot'tned- on.- the r~act:'ca. t*rlp* "6reali~rs. rt e~er:y- ,;-dueiing* outage ..

Fer &it 2* this m.ainten~ce" pr-o.aedbre was. l~st* -pet'!.ortned." in J.,.-~ 1~7.9-.. 'tt~i..s*

. mafntenanee w:i.11* oe* pe:rfOltmed:; iil'iOI" t'o i"ni:t'fal* CT-i*t:fea-ld..t:~* Oil: tln~*'C* 2'.

lt!di.\S1:CJ'- eY.perience- t:o. data vi.th tf~e- DS::..416

• ci:r~~ br~. lfus* 'f>-ean, goi>\\: in*'. _

tilirt *nlT i'n~e:t'\!'iee* f.aiJ;Ures

• ta-* tr.i:p- 'flave been-* 'X'*eportea,. t°O* dtte.-.. "l'fle

• DS.-41'6.-

bss:. l;ae?l in-serv.$ee. as ~actc~. trfy~ sw-i~ct~ar* .s.inu 19?1,;. a~d.: !-s. ur~ on .

.fusep,h t4*... Far:rey-1*.,_ Oh"£-l" &*;_2,. 1'rc$ui-re-:-.lr &.. 2' ~~ct Vi'l'&'k-1' ~ .. S~~i.~

The. f)S".:.4]:(J. eil"cilf;t breake~ ~- a. t>>i°m2t~ &n\i-ll'm:e' moder.n~ig~. tt:* Vas, designed:

arnf.: q~l:Ef.*ied.: to the ~atest appr.o'\"e'd: IBRE- *~anda~da-,.. t_1nm. m'~l9Jtr, M4: WEE 34*4:-l9JS--

'Trie underVl:rl'tage trip_: 1'.llecll1ini$tll. use~ oo* tt!~ tebe IJS-41Ef ~c~ft: br,uN.er.- ~an-:*

tme-Poiunr and.: si.mp-.l.i-!.1"e.0 dQsi"s.-r wh£di."* 1i.as- l~~l.Qi_. qpe-rat~-::.f.~i~_:to.n,,..arni *r*e~res* .

no -re?'ul>rH:.a.'t-i"-on. dtrrins. 1:11tri.ntonatace-.,. . * * - .:;:: . ~* *

':Ba$ed: c:in* 'ta2" aba.\l'-e. inftFrmati.-tmu;;~~e f.eet- ~e* >>S~4It:, .:ts s.d's-'l.~ateit *~l'i:f ierf. a11\f; 1

a~e* cont'id"ent tne ns~td:6:. w:i:*'.ll perf01:m,-wtdt-a* M;~ degree* of l'el'.tOOi*l"'ity:*.

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