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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I d.. ,4 DEGRADED GRID PRO *'lCT10st FOR CLASS 1E POWEP SYSTEMS l .

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

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AtSTRACT, -

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.- ' 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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.* 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.

s 7 - J Hh U.S. nuclear Reputatory Coudssion funded the work mder Authortra-g*N e

ttoe.98A 30-19-01-06.

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'A ~ I ' DEEroCD GRIO PROTECT 10p FOR CLA'55.1E POWER SYSTDt5 c ..,.-

k.:,...s WAS CITIES STAtton, .$tti MGS.1 AND 3

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. ? . h ,. u .On June 3.'1977, [ht M C Tequested Comenwealth Edison (CE) to assess IM;N at' electrical oestpoent at the Quad P.C';?

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'9 'd(susestibility of the safethrtla$jtp)gradet nprei:tles toofa the suttained offsite selttge' "

en$tts energency power systant.. The 3 3p *(y,.w'gt if, ' .

1sti.str.'eentained three pas M be compared.s After. '

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

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".M,.YR rest,anded 'tefthe W 34 'pr'oeletd tthpnJely 27, 1977.2 detailsCE proposed desig m

k . . .L. v - seditional en the ifications. en Otteber

?3uneW,1, Q,7, ? ,. ' .f.iCations en . % Drafte19thnical specifications were '

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, 5jt desry 1,198t,ober ' ad replacff28,'19thsty s Theteiwere a submittalpodified of nsrchby a subet5.tal of 4,1982.

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

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

{p'.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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n' A-ofAependish.*GeneralDesignCriteriaforNuclearPowerPlants,'

of 10 CFR 90 >. .

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[, 2. IIIE Standard 279-1ST1,'

• Criteria (

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

K i- 3. IEEE 5tandard 306-197 i Class 1E fower Systems for Nuclear Power

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

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dated .1ee 3,1977..

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.c 5. AK51 Standard C84.1-1977 6 'folt uA -. :.

syste.s and Ews-t (s0 m). y Ratings for Electrical Power te , ,,

u-E [, ^ ! . . IA [VALGATION

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

,3 C , SE $$ ting underval pr9tection at the Quad Cities Station; in Subsec-

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

? I 1 Nyal undervoltage protect %en; and, in $sbsection 3.3, a discussion of how p, ps systas meets the design base criteria. . ,

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

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

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

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ed trip the incaming p lina. breaker.

&.y.% % Mesisting logic circuitry of the undervoltsge protection system disable the lead-shed featues e,4cs the diesel generators are sup-

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., P .plyt 'd;ees .pener to the Class IE tusirs.' * '

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[.y ( ' , ,, .I.1; aledifications. 1's protect the Class IE' safety-related equipment '

p'y p ,, free48814\).9n0%er $4ftfVects ofset a degraded of andereeltage geld relaps'eqindition,'.the to each of the a160V licensee has Class it proposed

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

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

[ g ', two ' Nc2Hime atth essectated amails y relays,and a timer added to the

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- . 10gIC circuitry. .'like Seppe t of the Second-level protection 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 egetral rosa, the h ing line breakers isted te i:.y 6 98 bGi' ;breat '

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ta slesed when the voltage and hsed is Salt 42 tad frequency finally fromthethediesel dieselgenerator .

"are shtisfactery. De lesswef-voltg~

• relays function as before, GN' r0 h,3

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%.L. . Sege'tbe diesel stor.it suppl. Its asociated Class-1E bus, Q

1e61h6dd%;SSb 3 ed Sp the 7 of the. diesel generator breaker.

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' PedpoC*J eboges te the Statlee's techn3 cal specifications, meding the L.+o# '$araefflasce reestrements, aliadsele Meits.for the setpoint and ties delay, and itsHttag monettiens for operat6es,for th b%?,9 'ama {t(PS;aere furnished by the liceasse.I c '.N y -.M-E ;e second-levet underboltage r .

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P MN#tstesslos. ftest[siesNtonEf'theSCstaffle'tteel tw uired

{k, Y ~het t S-secess mesiItage of protectten sA The letter stipelates other criteria that the undervoltage for the onsite power systes C

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protect es seest'aset. . Each crftertes ~1s ' restated beten fallowed by a dis-i< cussist referdlas the Itcensee's aseglianci.with that criterion. .

g. , a 75 +

b;, J.u *The selection of ve.1tepe end. ttee Setpoints shall be deterr.ined

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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

%.,3 * *"J.?p6.05 of the noter assinal voltage rating of 4kV. This voltage p N , .. f5etpoin

'p? plated.g2was che$en Df ter.e system voltage

'd .+ The t%es deley alIows ' operator actionanalysis to improve was thecom-

, . -l e, +y ,,1g ,9, 1 ,,,gg,. The,tiae,# slay is defeated immediately Should a 6.'* *G q ' ~ g.:- *r - 1.0CA signal occur. . ~ -

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

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J.' r19de spurious trips ef the effsite power tources.*

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( M.b;' $ , canditlems: "The timeleslay sel$cted shall be based on the feltcuing 3.

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

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3p. the pai y- t' delay met* is assened in the FSAR accident M .t . o:t 'L- T. ,

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5.' < ,' Thereis*ae.laesce(ISteFeelayforhadervel'tegeprotection speeld en acejdent 41pai ha presort. .The Class it bus will A7..is.

M:,:L.' be ready fer wptfor te. #1esel-generater,pedct before the we ~$ c..< (Af 4 dieselIs up te speed A

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distereences frge Peasttag the enerailab11 tty'of the offsite t

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<emw aaneres or I ndicates the 3.P & 3 safegg-reh ,te8'e nipa 4;7 ^

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7L - 4 fThe voltade gasflies'abe41'astematically,. fait eta the disconnec- ~

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f..!' The licensee has stated that the circuits associated with the I.[r -

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. undervoltage relays aset the, applicable reamirements of IEEE - '

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6. "The Techatcal Specifications shall include'lietting conditions

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The ItceRset*S preposal for technical specification changes includes all the required items, The. voltage setpoint, witn the

'f b.f ' 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~ leTherefore to*$ht.un6ervoltage relays, as oetermined by'CE,?is 18407. .lf both uncervoltage T/Y1 . Q relay s,etpoints .drifte( ta the apper lialt, tpurious trips of the offsite source degito operatten af Ahe'undervottage reinys tould

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1. '_ d, upper toleronces Itait cesgerrently.

are4cceptable.Therefore,(ag The Ita14 conditions for W 'j- operation, the serveillance requiredents.:the channel test 3tyP f p flf t

.gt d,: frequency and the calibration freeuency are included in the technical spec'figations,iand while apt is conformance with the y C sedel tachalent specifications, de',aset the criterie of the

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.,te reinstat.d are supplyti poserAR.411 me.c..maeu t.ke.t,uenced rs are trip,edleads.

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1. • " 1 T 3*M The itcassee has es#tftM.the Quad Cities Station to incorporate this W? .t i la the circutt essig lead-shed is' blocked by an auxiliary et the diesel gaaere.g. ner et ' it breaker.. - e rt.

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., J kPe' are te staulata less of offsite(power, la enjunction sith a simulatedduring sh to be performed at b)est once per.18 ag(aths r',j 1,,b4 , .y - injection actest%s.stgaat and to siumletelaterruption and subse-T 9f ' 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 ep' . < gesqrators are ampplyfog poser to their respective buses, and that p;. ' :f,, As so adverse tateraction betpoem the assits and offsite power w T,, % v. -4~ 4 w x.y 3,

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b,3 "h, Tha testing pr. propose' d ,by the licentee comply with most of 3'~ g - positten. Leed.

• ing en the' trip of eff51te'powerris tested.

\ #. 3 109, este ttpe die 6411gener4 tor it- sepplying the safety buses,

,, 6' c ted. A slemlated lesi ef ,the' diesel generator and subsequent load-i% ey and'1oad-sequencing esce the diesel generator is b6ck on-line is (tesses. A less ~ef the diesel g'enerator prohtbits automatic restart-id,y"' c *

.ifhe load sequenter is esktrolled by a contact of -the diesel generator

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er, and therefore ky design .vtripping of the diesels penerator breaker ft [ reset the 16ad de,dding and.the_ toad sequencing circustry. The time d .',1;; .

. .1furetion of the test will verify that there is no interaction between the

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