ML19220C147

Forwards Position & Comments Re Concerns of Low Grid Voltage & Qualification of Class IE Electrical Equipment

ML19220C147
Person / Time
Site:	Crane
Issue date:	08/26/1977
From:	Varga S Office of Nuclear Reactor Regulation
To:	Herbein J METROPOLITAN EDISON CO.
References
NUDOCS 7904280294
Download: ML19220C147 (18)

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Docket No. 50-320 Metropolitan Edison Comcany ATTN: Mr. J. G. Herbein Vice President P. O. Box E42 Reading, Pennsylvania 19603 Gentl emen:

SUBJECT:

TRANSMITTAL GF STAFF POSITIONS - TMI-2 o'f Low Grid Voltage (Grid Stability)

In order to resolve the concerne and Qualification of SCP Class IE Electrical Ecuipment for Three '!1le Island Unit 2, commen s belew and the enclosed Staff Positions define These staff positions were discussed our position on these matters.

at our meeting of July 21, 1977.

Low Grid Voltage 19, 1977, we require your As soon as possible, but before September c=anitment to implement the staff positions of Iten 222.46, and a schedule for that implementation. We will require that Positions 1, 2, and 3 of this itc7 be implemented prior to completion of the first refueling, and that Position 4 be implemented prior to initial power coeration.

(This general schedule is consistent with the philosophy of imple-mentation being imposed on operating plants.)

Cualification of E0P Class IE Electrical Ecuicment As soon as possible, but before September 19, 1977, we recuire your commitment to implement the staff positions of Item 222.47, and a

'le will recuire that the documenta-schedule for that inclementation.

tion identified in the first paragraoh of that Item be submitted orior to initial power operation, and that the installation of the environmental temperature monitoring system be completed prior to startup following the first refueling.

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• SU RM AME P O ATE M M u. s. s o v e * = c m ' * ** = tim e F ric s i s 7e - eas-424 NRC FODt 313 (9*6) NRO( 0240 q90A2 sui'97

letrotolitan Edison Cocoany '!ith ref arence to the Raq'.:es for 3.dditional Infornation of !! arch 15, 1977, Item 222.44 therein is withdra.,n.

Sincerely, Steven A. 'larga, Chief Light !!ater Reactors Branch 1 Divisicn af Project."anag n 7t

Enclosure:

As stated ccs:

Listed on following page p.,

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PEOCESI' ECR ADDITICNAL ISECF21ATICN -

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DISTRIBUTICU:

NRC PCR Lec il prta d ocket fi D -

L'.vR-4 Reading PSBoyd FCeYoung FJdilliams SAVarga Project Manager MService m m K.'m 3 s m -

Dross JKnignt Rredesco FLenton VAMoore FliVollmer MLErnst WPGa. : nill

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WMcDonald, MIPC EID IE (3) occ: J.R. Buchanan, NSIC Thomas S. Abernathy, TIC ACE 6 (16) 4 vb

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UNITED STA'ES 4

NUCLEAR RLGULATORY COMMISSION c

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Au;ust 26, 1977

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f Docket No. 50-320

• Metropolitan Edison Company ATTN: Mr. J. G. Herbein Vice President P. O. Box 542 Reading, Pennsylvania 19603 Gentlemen:

TRANSMITTAL OF STAFF POSITIONSTi1I-2

SUBJECT:

In order to resolve the concerns of Low Grid Voltage (Grid Stability) and Quaiification of 50P Class IE Electrical Equipme These staff positions were discussed our position on these matters.

at our meeting of July 21, 1977 Low Grid Voltag__e 19, 1977, we require your As soon as possible, but before Septembercommitment to implem We will require '. hat Positions 1, 2, and 3 for that implementation.

the first refueling, of this item be implemented prior to completion af i pc.ser operation.

and that Position 4 be implemented prior to init (This general schedule is consistent with the ph.ioscony of imple-mentation being imposed on operating plants.)

Qualification of 50P Class IE Electrical Ecui: ment 19, 1977, we require your As soon as possible, but before September commitment to implement the staff positions of Item 222.47, and a We will require that the documenta-schedule for that implementation.

tion ;dentified in the first paragraph cf that Item be submitted prior to initial pcwer operation, and that the installation of the environmental temperature monitoring system be completed prior to startup following the first refueling.

e db b f_ /

S.

Metropolitan Edison Compary -

With reference to the Request for Additlanal Information of March 15, 1977, Item 222.44 therein is withdrawn.

Sincerely,

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'5be) fen A.( k h, blfC\\,

/IP t '

arga, Ch ef

/ ght Water Reactori Branch 4 i

Li Division of Project hanagemant

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Enclosure:

As stated ccs:

Listed on folicwing page (I

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STAFF POSITIONS 222.46 We nave ccm:leted Our evaluation of :n: res;cnses :: cur request f:r (0* )

additicnal inf:rmaticn regarding the susce::acility of your d'esign with regard :::

(a)

Sustainec :egradec voltage.c:nciti:ns a

ne Offsi e :cwer scur:e. Inc

(:)

!nteracticn of the offsite and cnsite acergency :cwer systems.

In :nis regare, we nave devel :ed One f licwing staff pcsi-icns f:r use in ne review of plants in :ne CP and CL stage cf review.

These ;csi-tiens are essentially i:en:ical

:ne ;csitiens taken in :ne evaluation

f cperating plants in :nis regard.

The :csiti:ns are :ased On s aff evaluaticn of :ne res:cnses :: generi: inf:rma-icr. ecues ts #r :

,icensees ::. coera:Ing piants anc c:ner re,iatec inf:rma-ion, an :n :ne s

a::lica:1e General :esi;n Cr teria, as ciscussac in sa:secuen :aragra:ns anc in, issue,1c.,iC c.,4L.... O..

. n:2-i;c We require ina ycur cesign meet these :csi:icns.

Describe jcur cesi;n and hcw i: mee:s :nese pcsiti:ns; pr vide a;;re:ria e tecnnical analyses

su :cr any ncn-c:nf rmance.

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o of offsite ;cwer scur es unenever ne voltage se :cin: anc time delay limits have teen exceeced; ine vo tage sensors snall be,.esigned to satisfy ne a;;1icac,ie e) i recuirements of IEEE Sta. E7g-lg71, Criteria f:r Fr::ac-icn Systems for Nuclear Pouer Generating Sta-icns; anc

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...w 5pecifica-icns) snail incluce limiting : ndi-icn f:r :: era:icn, surveillance recuirements, trip set :cin s ith minimum anc maximum limits, and allcwable values f:r the sec:nd-level voi age protec-tien senscrs and associated time delay devices.

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u recuires:

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nese circui ts may be a ce.ayec ac:ess i

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following a I:ss-cf-coolan a icent)' 'b) recundant cnsi e '.~.

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,s su;: lies; and (c) recuncan: C.C. ?cwer su;; lies.

GCC-17 furtner re:uires tha: :ne safety func:icn Of eacn a.c. system (assuming :ne 0:ner system is not runcti:ningj sna.

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si ac:ectacle fuel design limits and ne cesign c:nci:1 r.s f:r :ne eact:r c clan pressure :cundary are not exceecec as a resul cf an-icipa:e:

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integri y and c:her vital func:icns are ain:ained curing any of :ne

cstulated accicents.

EXis*ing undervol tage.'DCri t.ra au*

• s'.*ically perf 0r 1 tha PKui-ad func-

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3 of the offsite ;cwer scur:e.

The Offsite ;cwer system is the :: men scurce ni:n ncr-aliv su:: lies

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..........i redundant safety-related electrical equicmen; is unaccec:a: e, we recuire the acdi:icnal safe y targins assccia ad witn i :leren:2 icn cf tne

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We require tha: the curren system designs au:cmatically preven:

Joad snedding cf the emergency buses once the ensite scurces are su; plying ;cwer to all sequenced leads an the emergency buses.

The design shall also include the capability cf the load shedding feature to be autcra-ically reinstated if the ensita scurce supply breakers ar

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3 licensees' bases fcr the set;cints and li.mits selected mus: be dccq ented.

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minimi:e the pr:bacility GCC 17 requires that pecvisiens be included :: ;1ies as a result of losing electric ;cwer f$cm any cf the remaining su;

~ lear pcwer of or ccincident with the icss of pcwer genera:ed by One nuc er :ne Icss of

~

k unit, the less cf power fr:m the transmissien netwcr,

pcwer frcm the nsite electric pcwer su;; lies.

ffsi:e ;cwer senscrs" The functicnal sa'ety requirement of tne "lcss-cf-o

) :cwer system detect :ne loss of voltage en :ne offsi:e (prefer-ec sfer :ne safe y-is ::

and to initia:e ne necessary acticns recuj-ed Oc tran The Icac sneccing feature, wnica One ensite system.

related buses ::

c nnecting :ne Onsite ;cwer sour:es ::

function price ::

is required ::

i:n :ne ensi:e ;cwer neir respective buses can adversely interac-w f

it nas sources i ? the Icad snedding f]atur e is no: y;assed a ter lisc :e

..e lead shed teature sncu.:

in

errormec its required tunction.

perfcrm its func:icn if :ne ensite sources reinstated :: allcw 1: ::

neir te reconnec:sc ::

are interru::ed anc are sucsequen:ly required ::

respeccive :uses.

Cnsi e : ver Scurce Testinc

?csition 2:

3)

ne Tecnnical 3:ecifica:icns inciuce a test re de require -->:

cence Of :ne cemenstrate One ful? functional ccerability and incecen The least ence per 13 enths curing scu dewn.

cesite :cwer s:urces a:

Tecnnical 5:eci'ications snall incluce a recuiremen-f:r :es:s;

, #. s t '..= rcwe r., (?. ',- e. '. u 'i a '...", i c s a. '. '. #. #. 2i.=

( i j 2.....a :..= *. 4. r., ~i m~ s - *. #.

a f ty feature actua:i n signal, Inc '

cwer in

njunction witn a sa e rec:nnecti:n of cnsite :cwer

,,a) simula:1ng interru;;ien and su:sequen:Prcper c;eratio s

their resnective buses.

sources ::

n, O

-)

7-a),leritying :na cn Icss or. c rsite scwer :ne emergency :uses r.a <e been de-energized anc :na: the. leads have been sned frcm tne emergency buses in ac::rdance witn design requi r cents, b)

Verifying that en less of cffsite pewer the diesel generat:rs star; en the aut star signal, the emergency :uses are nergi;ec witn permanently c:nnected icads, ne aut:-c:nnec ac sner. wn 1:acs are energi:ed nrougn :ne ica'c sequencer, anc :ne syseen c:erates for five minutes wnile ne genera::rs are 1:aded with :. e snu.d:wn

,cacs.

s

,,er1rying that en sarety ra.itures actuatien signa,i tai:ncut,i ss r.

c) crisite pcwer) One d,.esel generators star :n the aut:s ar; sigr.a,i and cperate :n stancby for five :.1inutes.

~

d)

Verifying tna: On icss of Offsite ;cwer in ::njuncti:n wi n a safety 9

features actuation signal One ciesel genera rs s 2r On :ne aut: star signal, the emergency buses are energi:ec 4itn termanently c:nnec;ed

, cacs,

.a.

1.J +. - e.... a.e.. a s. a..n.e e-a n c y. ( > c. a.an. n. ')

. v a n.e 1.- a. a. c.. e.e : a.. a s.

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s.

hrougn the 1:ac secuencer, anc :ne sys ea 0: era es f:r f've inu as wnile One ;enerat:rs are leaded wi:n *he emergency icacs.

f

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a. ') ya. ri e. v i..

. a *. " n i n *..= r. u - *.d. v n ^. #.

'...a.

+ n s '.. s 2.

s sned fr m :ne emergency buses in ac:Ordance sitn design re'qu'ce-d d u c s e"2 ". w.n, 'i a.= c i.. g

• n a.

n.s'..= av"-.as

.a **.. "..

-..en.a-a. d.

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a 3

v ei One icad secuencer.

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GCC 17 requires :nat provisiens be included to minimi:e :ne procacili:)

of losing electric pcwer frem any cne of :ne renaining su:: lies as a result of or coincidenc with the Icss of pcwer generated by :ne nuclear pcwer unit, the less of ;cuer frem the transmission neracrk, or :ne less of pewer frem the ensite electric pcwer sup: lies.

The testing recuirements icentifiec in Pesiticn 3 will demcns ra:e :ne ca: ability of :ne ensite pcwer system :: :erform i:s recairec func icn.

The tests will also identiff uncesiracle interacticn between :ne Offsite and onsite emergency pcwer systems.

4)

Positi:n 4: Optimi:ation of Transf:rmers Ta; Sc :ir.gs The voltage levels at the safa:y-related buses sncule be :::imi:ec for ne full lead anc minimum icad c:nditiens that are e.x:ectec :nr:u;ncut ne antici:ated range of voltage variaticns of :ne cffiste :cwer scurce :y a:Orceriate adjustment of :ne v:itage :ap set:ings of ne intervening trar: f:rmers.

Je require that :ne acecuacy of ne :esign in :nis regard be v. rifisc :y actual measuremen:, anc :y :Orrelaticn of reasurec valaes e

with analysis results.

Provide a descrip;icn cf One me:ncc f:r making this verifica?icn; before initial react:r :cwer ::eraticn, r:vice tne dccumentaticn recuirec to establish :na: :nis verifica:icn nas teen acccm:iisnec.

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~

filflCT10llAt. titill A or B g

1.0SS Of POWIIt

1. 2. 3 4.16 kv innern}ency Bus 3(2)/Ilus M

linifervoltage (l oss of 4(3)/Ilus 2/Ilus a-a.

-e Voltage)

E'!

l A or B s,,

y

1. 2. 3 4.16 kv fmergency flus 3(2)/tlus Y'

h.

2/ flus Undervaltaeje (flegraded 4(3)/Itus E

Voltage) 5; 12 p.,

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w e'

e l

for

• (Entries in parenthesis are applicable 2 out of 3 coincidence logic) i

• allequireit whc5 i Si celuipinent is re(psirest to be operable

• • • Action A for 2 out of 4 logic Action 11 for 2 out of 3 logic t

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ACTICN A

- With the num:er of CPERAILE channels one less than the Total Number c. Channels Opera:icn may pr:ceec previded both cf the foliewing c:nditiens are satisfied; a.

The ine;erable channel is placed in the tri; ped c:ndition within ene hour, b.

The Minimum Channels CPERASLI requirement is met; hcwever, One addi-i:nal enannel may be by assed f:r a: :: 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for surveillance

,,..,4.:.4.,.,.,.n (.

,9 4 1).

. s.1..3

,c.

ACTION 3

- Wita the. umber cf CPERA3LE Channels One less than the Tctal Num:er of Channels :: era-icn may pr:ceed untii

erformance Of the nex recuired CHANNEL FUNCT!'NAL T7.37 ravided. '

• a.

i n. e r.$."l a.

w.'. 2..7 a. l i s

• g *i.2..a.

'n. *

• a.

a tri;;ed c nditien within i hcur.

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'h..K TAllt.E 3.3-4 (ContInel),

filGiliffitfD SAffTY ffAltlitE ACTllAT10ll SYSTI:H lilSTittittfilTATI0li TillP val.I Co 4

CD ALLOWAllt.E I

CD val _lifS Iy TR1P VAtlif f tillCT IOllAl.1118Ii g

LOSS Of l'Ollfit

) volts wills a f

+

4.16 kv linergency Ilus lladervoltage

{ 1 ) volts willi a L i ) second time delay

( 1 ) second tline delay

~

a.

(Loss of Voltage)

( f lI ' volts wit):

a

( 1 )) volts witi a

( 1 second tline elelay

( 1 I second tinie delay li. 4.16 kv finergency flus tinifervoltage (Degrailed Voltage)

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_ to

.m 4.8.1.1.X Eacn diesel generator shall be de cnstrated CPERAELE:

a.

At least cnce per la men:ns curing si.utdcwn by:

q

.imulating a 1 css or. orts 1:e ;cwer y 1:seir and in 1.

conjuncticn wi-h a safety fea:ures actuati:n :es:

signal, anc witn a non-acciden scram signal, a)

Veri fying tha: en less cf Offsite :c..er the aner ancy buses have been ce-ener.gi:ec anc :na-1:acs nave been snec fr:m :ne emergency :uses in ac: r:ance ai n :esign requirements.

s. )

,ler1rying :na: en icss of offsi:e cwer in ::n-junction wi:n a ncn-ac:iden: scram si;nal :ne diesel genera: Ors star: cn :ne aut: star: si ;nal,

tne emergency buses are energized wita :ermanen:iy c nnected leads, tne auto-c:nnected snutdcwn lcacs are energi:ed thr ugn the load secuencer, and ne system Ocerates for five minu es wnile One generat:rs are leaded wi n the snu ::wn Icacs.

)

Verifying that en safety 'ea:ures ac:.2:icn si;nal (withcu-less of cffsite ;cwer) :ne diesel gene"a :rs start on :ne aut: star signal anc Ocera a :n stancby for five minutes.

O')

Ve ri f.vi n. :na: en icss of offsi:e :cwer in ::nj;ncti n wi-h a safe v features actua en signa,i, ne : issei cenerat:rs s.ar. cn...u.,<.,,a...

...... > i r : a t,.. a.

mac'a9cy Euses are enerci:ed wi n :ermanen-iy ::nnec ac ica0s,

1:en-). acs are f

i One au::-c:nnec ac emergency 1ac:

energi:ed tnrcugn the lcac secuencer, and ne system Ocerates for #ive minu as

'.# rile :ne genera;;rs are leaded with tne emergency 1:acs.

e)

Verifying :na: en in erru:-i:n :f :ne :nsite scur:es ne leads ara snec # :m :ne emergency :uses 1n ic::rcance w

.eb u-W a

cf *ne ensite scL.'Ces is *nrcugn :ne 1Cac secuencer-O1 04 4 0O di l t

w es enemilms

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Wita regarc tc ali : lass lE equipment iccated ou: side one c:ntainmen:

222.47 all cf :nis equip-building we require documentation wnics s?.a:es :na:

men: nas :een. certified :: satisfy the acplica:ie incustry standarcs (e.g. MEMA and ANSI). ~

Fur:ner, ne recuire assurance tha: :ne envi r:n. ment a: ne ecui: men: I:ca:icn is is maintained witnin -he :am:erature range for wnica :ne equi: men In :ncse icca:icns wnere :ne tem: era:ure c:uic

, cuali fied :: c:erate.

exceec that for unicn :ne Class IE equi; ment is qualifiac, ne staf#

...ne requires tha: :ne a;clican: provide a :em: era:ure ment : ring system.

system shculd at a minimum meet :ne folicwing recuirements:

1) The c:n:r:1 rcca sncule receive an alarm unen :ne :empera:ure range This alarm snculc te pecvicec by instr'_ men:aticn has ceen e.cceeced.

wnich (a) is of a nign quali:y, tecnnical verify its functicnal ca;acility :y plan:

(b) is checkec ::

speci fica:icn requirements, anc is ;cwerec frcm a continucus cwer source cr is recundank si:n (c) separate cnannels and :cwer scarces.

p r,

,9

2

2) The operator shculd have a me:ncd of.aintaining a continucus record of the temperature during tne ti.:e tnat ne temcera:ure range is exceeced.

Based on the mon;~;cring system tne applicant shall recer: the occurrence of the Emcerature axceeding the equipment qualifica:icn range and its duration as a license event recer: :

n e.'t.RC.

In addition : :nis, One apolicant snall provice results of an analysis Oc demonstrate tha: ne excess tamcerature has no cegraced the involvec Class lE equi ment belcw an accectacle level for continuec plan coeration.

o, q47 m

00 U 1) 2