ML19258A070

Degraded Grid Protection for Class IE Power Sys,Quad Cities Station,Units 1 & 2, Preliminary Informal Rept

ML19258A070
Person / Time
Site:	Quad Cities
Issue date:	03/31/1982
From:	Udy A EG&G, INC.
To:	Prevatte R Office of Nuclear Reactor Regulation
References
CON-FIN-A-6429 EGG-EA-5810, EGG-EA-5810-DFT, NUDOCS 8205040018
Download: ML19258A070 (11)

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DEGRADED GRID PRO *'lCT10st FOR CLASS 1E POWEP SYSTEMS

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QUAD CI!!E$ STATION, UNIT #105. 1 AND 2 r.

.i-Docket no. 50-254 and 50-265 g

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March 1982

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AtSTRACT, rp,i*s

.- ' This EG4G Idaho, Inc. ' report reytews the fasce" tibility of the saf ety-bC re14ttd electrical equipner,t,, at the Quad Cities Station, to a sustained

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Qgeadation of the offsite power sources.,,

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. JThis report is suppited as part of the *$elpetec operating Reactor Isb Program fIII)" being conducted for tt. E5. Nuclear Regulatory Cp (i-etskton; Office of Seeleer Re6ctor Regulatten, Divisin of Licensing, by N'-

EG04 Ida%. Tac., Reliability sad $tatistics Brr.h.

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$N'tVALUATION......................................................

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DEEroCD GRIO PROTECT 10p FOR CLA'55.1E POWER SYSTDt5

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. ?. h,. u.On June 3.'1977, [ht M C Tequested Comenwealth Edison (CE) to assess P.C';? '9 'd(susestibility of the safethrtla$jtp)gradet IM;N at' electrical oestpoent at the Quad be/ySd.

b dn,..CR4t:$tation to a suttained selttge' en$tts energency power systant..

The 3 3p *(y nprei:tles of the offsite 1sti.str.'eentained three pas with'tiklen the current dreign of the plent if, '

,.w'gt M be compared.s After. '

lag the'corrent dttip to tee staff post-c,fe ' f,.tFSS 'G Wes required te g'1therj'grop0Sd eDdificathms to satisfy the post-M W ad criteria.or,feraigh.an anel 1 t(substantfate that the er.isting p Wi f.ci$ 1 (actifty design has eguivalekt:$3p4bi it es,..,e,

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".M,.YR rest,anded 'tefthe W ' tthpnJely 27, 1977.2 CE proposed desig m

ifications. en ?3uneW,1, 34 pr'oeletd seditional details en the k...L. v -

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. % Drafte19thnical specifications were desry 1,198t,ober 28,'19th s Theteiwere podified by a subet5.tal of tied es Oct o- @

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' ad replacff sty a submittal of nsrch 4,1982.

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The design base eriteris,that mere applied in determining the acce '-

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I9 abillity of the system modifications to protect the safety-related equipment

{.i from'a, sustained degradetion of the offsite, grid voltage are:

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L General Gettyn Critseien 17 ( D C.17) ' Electrical Power Systems,'

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IIIE Standard 279-1ST1,'

• Criteria (

nuclear Power Generatteg it$ tiers'.'gr Protection Systems for y

IEEE 5tandard 306-197 i

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Generating Stations.*g;.

Class 1E fower Systems for Nuclear Power

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4., Staff posit 3ons as teiled in a letter sent to the Itcensee, L/

dated.1ee 3,1977..

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AK51 Standard C84.1-1977 syste.s and Ews-t (s0 m). y Ratings for Electrical Power 6 'folt

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. This section prowb, in Subsection 3.1. a brief description of the

,',. $$ ting underval 9,.,

. 3 SE pr9tection at the Quad Cities Station; in Subsec-C

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$1em 3.Z, a descr let gf the licensee's proposed scheme for the second

, ? I Nyal undervoltage protect %en; and, in $sbsection 3.3, a discussion of how 1

p, ps systas meets the design base criteria.

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.13,.b9istins undervol', age Protection. The present design atilius

.tue serpoltage relays t3 ese.n. 41wv c1Es 1E bus. They are arranged in a li ~%

• two Nf two logic schk that tentes complete 1_oss of voltage..The r, L. " c.,rei W their leste circuitry staFt the diesel generator, initiate loac-

)f % s. f, shedalag, ed trip the incaming lina. breaker.

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Mesisting logic circuitry of the undervoltsge protection system f; *j,h 'd;eesdisable the lead-shed featues e,4cs the diesel generators are sup-P.plyt

.pener to the Class IE tusirs.'

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.I.1; aledifications. 1's protect the Class IE' safety-related equipment p,, free $4ftfVects of a degraded geld eqindition,'.the licensee has proposed p'y 48814\\).9n0%er set of andereeltage relaps' to each of the a160V Class it

beses..VEach set will bp cgspeised ef tue. solid-state undervoltage relays

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that ' 99 m taherent ties delay of seven seconds. arranged in a two-out-of-

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' Nc2Hime atth essectated amails y relays,and a timer added to the 10gIC circuitry..'like Seppe t of the Second-level protection

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jJ,f,., relays,W1 be 3800f f S with a 19ee de{ay of 5 minstas.

Should the taro 4

m itepe relays re, main,tr for 5 sinates, orrif a toCA signal eccurs k,. 3 % der that $

ante per$ed.

Wiesel is started and the undervoltage i:.y 6 98 isted te egetral rosa, the h ing line breakers

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sheddiag~ is Salt 42 tad G

dre b i' ;breat ta slesed when the voltage and hsed finally the diesel generator frequency from the diesel GN' $sith efagtp(sfat of 304R + M.

"are shtisfactery. De lesswef-voltg~

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Sege'tbe diesel stor.it suppl.

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'$araefflasce reestrements, aliadsele Meits.for the setpoint and ties delay,

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% 9 'ama {t(PS;aere furnished by the liceasse.I ;e second-levet underboltage and itsHttag monettiens for operat6es,for th b ?,

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{k, Y ~het S-secess mesi of sA P

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ftest[siesNtonEf'theSCstaffle'tteel tw uired t

Itage protectten for the onsite power systes y~bepresh)eet.

The letter stipelates other criteria that the undervoltage

.3-C protect es seest'aset.. Each crftertes ~1s ' restated beten fallowed by a dis-i<

cussist referdlas the Itcensee's aseglianci.with that criterion.

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J.u *The selection of ve.1tepe end. ttee Setpoints shall be deterr.ined V y^. 4 kW from an analysis o the es1tege requirements of. the safety-related A,e,s 4 3.ls&ds at all ansite syster ' distribution levels."

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Mi'The licensee's proposed Setpoia"t of h840V at*the a160V bus is I t*? ',

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• "J.?p6.05 of the noter assinal voltage rating of 4kV.

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'p? plated.g2was che$en Df ter.e system voltage analysis was com-f5etpoin

'd The t%es deley alIows ' operator action to improve the

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,,1g,9, 1,,,gg,. The,tiae,# slay is defeated immediately Should a

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'The voitage pr6teetten shall include co1oc(de'nce logic to pre-J.'

r19de spurious trips ef the effsite power tources.*

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"The timelesla

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8Theallesab ttas elef, including margid, sk&11 not exceed

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the pai y t delay met is assened in the FSAR accident

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speeld en acejdent 41pai ha presort..The Class it bus will 7

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?fhe ties? delay' thall eitatsize dig effect af short-duration

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distereences frge Peasttag the enerailab11 tty'of the offsite

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.g7 Tha 4 6ce...,n6ee's Scept$ed infataus tiet delay of 5.6 seconds is

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to seerefet eitr sheet ineemseevesttal grid x,p.

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ta.stidAdbeatles of etda,y' aged b1tage condition W

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A'rorles of **kiay*e5fB voltage,asalpsis I ndicates I

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safegg-reh,te8'enipa 4

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ties delay Itsttrhppe.aearge& depewer the ve1%ge setpoint and tion of effstta'peper' v,

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"The voltaos saatters shall be esigned to Satisfy the require-s N.. >.

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The licensee has stated that the circuits associated with the undervoltage relays aset the, applicable reamirements of IEEE V

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Standard 276-W11. "

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"The Techatcal Specifications shall include'lietting conditions for operations. Surveillance reevirements. trip setpoints with W

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sinimum and assissa iteits. and allowable values fer the second-1*

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level voltage protection monitors.'

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The ItceRset*S preposal for technical specification changes

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includes all the required items, The. voltage setpoint, witn the

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maxioud allowab1h }1eit Jacluded,.is $917V. A high setpoint is i

'-C needed to assure adequate voltages te all. Class' IE equipment.

. ;4, % NP/'"h;.The louest busjottage.avaig~ le to*$ht.un6ervoltage relays, as oetermined by'CE,?is 18407.

Therefore.lf both uncervoltage T/Y. Q relay s,etpoints.drifte( ta the apper lialt, tpurious trips of the 1

offsite source degito operatten af Ahe'undervottage reinys tould

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occur. It is (p*,jkely that both setggists wouit drift to the v.

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,b s W h upper Itait cesgerrently. Therefore,(ag conditions for the proposed setpoint and toleronces are4cceptable. The Ita14

1. '_ d, 'j-W operation, the serveillance requiredents.:the channel test f flf d,:

frequency and the calibration freeuency are included in the p t technical spec'figations,iand while apt is conformance with the 3tyP

.gt sedel tachalent specifications, de',aset the criterie of the c 4 Tv. *T'hy ;,

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f +)' The second JRC staff, post}, ion requires"that '&e system design c.uto-

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$cally prevent:1es6-shedflog of the amargen~cy buses wee t%e onsite 4+

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,<ces are supplyt The load-shedding must poserAR.411 t.ke.t,uenced leads.

me maeu rs are trip,ed te reinstat.d i

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T *M The itcassee has es#tftM.the Quad Cities Station to incorporate this

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la the circutt essig lead-shed is' blocked by an auxiliary et the diesel gaaere.g. '

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._ dird W. staff position rege' ires that certain test requeasents

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to the '.echnical specifications., These, teilts were to demonstrate g~ Y'. g. 6, H-functitmaal operabilj yfant ?beependenpir of the onsite power sources kPe to be performed at b)est once per.18 ag(aths during sh The J

' are te staulata less of offsite(power, la enjunction sith a simulated r 1,,b4

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- injection actest%s.stgaat and to siumletelaterruption and subse-

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' reconnect 10s (ensite"g#mqr edigrees.' These tests verify the proper q ' rk,.. g et, ton of the load-shed systant,"the load-shed bypass idhan the emergency gesqrators are ampplyfog poser to their respective buses, and that ep'.

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As so adverse tateraction betpoem the assits and offsite power 4

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propose',by the licentee comply with most of d

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ing en the' trip of eff51te'powerris tested.

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1. . 3 109, este ttpe die 6411gener4 tor it-sepplying the safety buses, ted. A slemlated lesi ef,the' diesel generator and subsequent load-6' c

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ey and'1oad-sequencing esce the diesel generator is b6ck on-line is id,y"' c (tesses. A less ~ef the diesel g'enerator prohtbits automatic restart-

.ifhe load sequenter is esktrolled by a contact of -the diesel generator 6' w e er, and therefore ky design. tripping of the diesels penerator breaker v

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[ reset the 16ad de,dding and.the_ toad sequencing circustry. The time

.1furetion of the test will verify that there is no interaction between the d.',1;;

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pffafM and the onsite power sources and that the load-shed bypass circuit

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gacy of Station Electric Distrhtion 3ystem Folta

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