ML20214N647

Proposed Tech Specs,Modifying Trip Setpoint for Reactor Coolant Pump Undervoltage Reactor Trip Protection Channel. Related Documentation Encl

ML20214N647
Person / Time
Site:	Sequoyah
Issue date:	05/22/1987
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20214N631	List: ML20214N629 ML20214N647
References
TAC-R00130, TAC-R00131, TAC-R130, TAC-R131, NUDOCS 8706020254
Download: ML20214N647 (41)

Text

,

'. h ENCLOSURE 1

. PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-87-18)

LIST OF AFFECTED PAGES Unit 1 2-6 Unit 2 2-6 9N t

l 87060202S4 870522 PDR ADOCK 05000327 P

PDR o

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q TABLE 2.2-1 (Continued)

M REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS

].

Y ALLOWABLE VALUES t

=

TRIP SETPOINT FUNCTIONAL UNIT

> 18% of narrow range instrinnent

> 17% of narrow range instrument n20 1

i k

13. Steam Generator Water span-each steam generator span-each steam generator Level--Low-Low

< 40% of full steam flow at

< 42.5% of full steam flow at w

l

14. Steam /Feedwater Flow RATED TilERMAL POWER coincident RATED TilERMAL POWER coincident Generator. Water Level with steam generator water level with steam generator water level I

Mismatch and Low Steam l

> 25% of narrow ran0e instru-1 24.0% of narrow range instru-l, ment span--each steam Generator ment span--each steam generator

15. Undervoltage-Reactor

> JSatfvolts-each bus 1 43H volts-each bus 4731 Coolant Pumps 5 02.2.

> 56.0 Hz - each bus 1 55.9 Ilz - each bus

16. Underfrequency-Reactor T

Coolant Pumps m

17. Turbine Trip A.

Low Trip System 1 45 psig 1 43 psig Pressure B.

Turbine Stop Valve

> 1% open

> 1% open Closure

18. Safety Injection Input Not Applicable Not Applicable from ESF l

0

> 6 x 10'II amps

> 1 x 10 amps

19. Intermediate Range Neutron Flux - (P-6) Enable Block Source Range Reactor Trip l

.; 3

< 11% of RATED

< 10% of RATED

20. Power Range Neutron Flux TilERMAL POWER

[; p TliCRMAL POWER (not P-10) Input to Low Power l

, ll ;

j i, Reactor Trips Block P-7 c!

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r TABLE 2.2-1 (Continued) mj REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS FUNCTIONAL UNIT TRIP SETPOINT ALLOWABLE VALUES c

13. Steam Generator Water

> 18% of narrow range instrument 117% of narrow range instrument R7 Level--Low-Low span-each steam generator span-each steam generator

14. Steam /Feedwater flow

< 40% of full steam flow at

< 42.5% of full steam flow at Hismatch and Low Steam RATED TilERMAL POWER coincident NATED TilERMAL POWER coincident Generator Water Level with steam generator water level with steam generator water level 1 25% of narrow range instru 1 24% of narrow range instru-ment span-each steam generator ment span--each steam generator

15. Undervoltage-Reactor 1 ASa6 volts-each bus 1 Mfri volts-each bus Coolant Pumps 5 02.7.

4739 s

16. Underfrequency-Reactor 1 56 Itz - each bus 1 55.9 llz - each bus Coolant Pumps

17. Turbine Trip A.

Low Trip System 1 45 psig 1 43 psig Pressure B.

Turbine Stop Valve 1 1% open 1 1% open Closure

18. Safety Injection Input Not Applicable Not Applicable from ESF

-10

-11

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-> 6 x 10 gs E

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[. p Source Range Reactor Trip i'

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< 10% of RATED

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(not P-10) Input to Low TilERMAL POWER I)

Power Reactor Trips Block P-7 ii 4

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k ENCLOSURE 2 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-87-18)

DESCRIPTION AND JUSTIFICATION FOR MODIFICATION OF TRIP SETPOINT AND ALLOWABLE VALUES FOR THE REACTOR COOLANT PUMP UNDERVOLTAGE REACTOR PROTECTION CHANNEL

,o sp e

ENCLOSURE 2 Description of Chanze The trip setpoint and allowable values for the reactor coolant pump (RCP) undervoltage (UV) reactor protection channel (table 2.2-1, functional unit 15) are being changed to 5,022 volts and 4,739 volts, respectively. The change in trip setpoint is in the conservative direction.

The change in trip setpoint is also consistent with current and past practice at Sequoyah. The relay setting sheet shown in attachment 1 indicates that the nominal RCP UV relay setting has been conservative. This change simply brings the technical specifications in conformance with current channel accuracy calculations.

Reason for Change TVA has revised the instrument accuracy calculations for the RCP UV reactor protection channel. A copy of the calculation is included as attachment 2.

The calculation package determines the overall channel statistical allowance and safety margin. The calculation was revised to specifically address measurement and test equipment accuracies and to correct the rack terparature effects. Previous calculations assumed that measurement and test equipment was sufficiently accurate to neglect its effect in setpoint calculations.

Justification for Change The RCP UV instrument loop consists of a 7200/120 volt potential transformer and an UV relay which provide input to the reactor protection system. The nominal electrical board voltage for the RCPs is 6900 volts. The calculation of the instrument loop accuracy and the resulting safety margin are described in Sequoyah calculation RCP-UV-DEVICE 27.

The UV relay setting is based on the Westinghouse safety limit of 68 percent of nominal board voltage for the RCPs, the relay guaranteed actuation value, and the overall channel accuracy.

The instrument loop channel accuracy calculation was performed using the secondary side voltage of the potential transformer. The technical specification values are based on the primary side voltage. Table 1 provides a listing of key primary and secondary side voltages.

The nominal UV relay setting is 90 volts, which corresponds to 5400 volts on the primary side. The trip setpoint is considered to be 93 percent of this value or 5,022 volts.

This value is based on the manufacturer's guaranteed actuation at 93 percent of the relay setting, as noted in the attached calculation. Actuation of the relay at a higher value is indeterminate; hence, the nominsi setting cannot be considered the trip setpoint as used in the technical specifications because actuation is not guaranteed at that value.

The allowable value wqs calculated using essentially the same setpoint methodology as that used for V. C. Summer, which was reviewed and approved by NRC in NUREG-0717, Supplement 4.

The total allowance (TA), defined as the difference between the trip setpoint and safety limit in percent span, is calculated using the trip setpoint and the safety limit.

TA = 83.7 - 78.2 X 100 - 18.33% of span 30

. The difference between the trip setting and allowable value setting is determined by the smaller of the following two values.

In effect, this method provides a conservative allowance for rack effects. The allowable value is used as a trigger value during periodic rack testing.

This trigger value ensures that sufficient allowance remains for the rest of the channel to is an arithmetic sum of the guarantee actuation at the safety limit. Ti is the total alloesnce minus the statistical rack error components. T2 computation of the channel error excluding the rack components. Using the smaller of the two values ensures calculation of a conservative trigger value.

The individual values used in these equations are defined in the attached calculation.

T1 = (RD + RCA + RNTE + RCSA)

= 18.3% of span T2 = TA -((A + S )1/2 + EA]

2 wheret A ='PMA2 + PEA 2 + spg2 + STg2 + RTE 2 S = (SCA + SMTE + SD)

T2 = 16.9% of span T2 is used to calculate the technical specification allowable value. The UV relay setting corresponding to the allowable value is calculated as follows.

Equivalent Allowable Value Setting = 90 - (.169)(30)

= 84.93 V To be consistent with technical specification usage, the guaranteed actuation value of 93 percent is used. The allowable value is 78.98 V, or 4,739 Y on the primary side.

In summary, the trip setpoint for the RCP UV reactor protection channel has been esiculated to be 5,022 V.

The corresponding allowable value has been calculated to be 4,739 V.

1 l

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e TABLE 1 6

secondary Side Primary Side Voltano Voltane UV Relay setting 90V 5400V Guaranteed Actuation 83.7V 5022V Trip Setpoint Setpoint (93 percent of Relay setting)

UV Relay setting Minus 84,93V 5095V Rock Error Components Guaranteed Actuation 78.98V 4739V Allowable Setpoint (93 percent of Value Relay Setting Minus Rock Errors)

UV Relay setting Minus 84.49V 5069V channel Tolerance Guaranteed Actuation 78.58V 4715V Setpoint (93 percent of Relay setting Minus Channel Tolerance)

Safety Limit (68 percent of 78.2V 4692V Roard Voltage)

UV Relay Span 70 to 100V 4200 to 6000V l

i ATTACHMENT 1 SEQUOYAH NUCLEAR PLANT RELAY SETTING SHEET 8436, DATED FEBRUARY 15, 1980 e

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7g Supersedes No.__8359 Dat._

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i I i DEFINIT 10 5 Ale A88AEVIAil0 M: I l [ . CSA Chennel Statistical Allowance i MIA = Process steeserement Accurecy l 'MA Primary Element ktorecy l Senter talt6retten Maurecy SCA = l SRit ' I j Senser Measurement and Test (gulpment Accuracy = St = Senser Drift j Sit Senser Temperature Effects = j Spt a senser Pressure Effects { RCA Rath Calibretten Accuracy i = estit Rock lees urement and Test Equipment Accuracy = Bath Concerater Setting Accuracy { RCSA = BO Back Grif t = RfC . Sack feeperature Effects = tnotrennental Allowance { EA = m e o,,.........-., i CS = causeateo 594N l i 1 i l The relattenship between the error seepenents and the t'etal statistitel i error allowance for a channel is, j Cu e t.pi.3.<nai<.nc..sm.tn<.nto.n n.<.ca cu 3.<.fo 1 i 1 r 1 i l M M IffSffRMNT DEMedETRA,ftO . D.C_V.e d. e._.2_1.. _. _ yy, m y w rg melma + Immu E i ,t e /

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%c.- i e i i l 1 ACCURACY CONT'D I ( ACCURACY PARAMETER $ CONT'0: I l NOTES: l l IS % 4.6.R mans R. A. Ge sen s 1%,o* u o m m i wa i (MMS M M. L2 t a t o il C9 5Ch Yre d pl acu' OA s FT i l 'M ACCa d eM*1' 1*$ (, C Q 'Of V RL. (coeV) ~'~ W 4.c 4 is xcu r. cn -ro e m ^ 4.,, 157_e r%e e so. L1_ ha RO N P "'i~e e s G Q e c. -rne n e A Y<> t m.m ae m.m,~ m,c wum, \\ G tJ '' A4 e f 1) H * * t+ 9 ** l **E ree M 4't4 $, l l r ., W._ R M n~C nu e os ne e eac wo n u -r w Ras 9 votwe. w,a, e n i.a r%_A E N f5 r y e ?,s oAs G 3aDG e.s & *y* Ro ses tam bleGirmsNo wcd< <*->,:>oir /}1m.;nne,y IT s Gurnet a w* <._ A RCAcTs4 -r*R G ud r u. Occup wmod Y,<e t p r v,i e u,u uv* *; oc n weirnur. 2.ee vena TA wm f\\ a7Crss-cn. ~~e m ca. - -e w ,e.e werc cy we r_w.s. LK.,,, Repo's ri*rs.r s' is f er sac, usec in my= Rw % e. spu r, s..v Ace erpaev (RCA.} riv e e n e~' e oe uc PM vin ura r sa-ne aav e r so The n er % r,*d,<.- v is ' :.0% MG <eTtbr err D *'P rec

• Cee) PDTn eeH I. r?.

A cuer r f TvA b n+> n Gersant meereoc Co. 0,v 2 / + /%. 'G-urpo s a r 90 vot.vs' Me ArrA am su-r 4 < > + 3 m:.3. lRI A T4e rea re_u n c v r e-c, <. o en ev Tr< A,deJ 10Au f?coh ~% i'r ~,.- r,,e,n,re u r.a e t ,a % v sMO. 2D So DICEG Ckte U.='" e r - 100 Fo *'L c ca">~ ?M~ V.) P d) s~a-er TI. *; w e - r hpdr % f % es-U NL f **0V\\. \\ Op.~a#MP s/rs/s f ene-Fr a */ws h esseem $ gMSTIlupWNT DEMONSTRATED ,._Q6diC6. A7,., esmas.ht. JJf4 ACCURACY CM.CULATION

i. j,

I l . ~ g

htn.

3: t l l' i l i ACCURACY CONT'D CALCULAfl0NS: CA FIEA = = c.3 'P, ec uPL / eenv N / cs t'sev% l = f(c.cosV.oevS / sov i OEA = 2 I'Z. s c S P q (2) RCA = 2 2.o *l. M <*emvo or /90vaM /ce (fev) =10.013(9av W sov ~ KCA = x c.o*?. aispu i 83fCSA t /.o % v s s.v. r9ev3/ cs r 3e v% = OCo.oiN 9ev3/wov ~ e RCSA =r t s3.c % v scwo j l 1 \\ ~ _ r (% R TE = d[O.ct'h or uPL C,eeh/ ac a) s b r l /c.5 (So v) c w AT = i i O - go =.3 o O :/ i t 9-) <r2 l[o. cod)(soesv)/(Snee5\\ y Soy / 3cv RTE - e " t o CT, y sQ " (5) RD =:.0% or UP L Coov)/r9 v s) % N'*[" /?oV N 70. O t 3 ( i co v3 /14 ~..sl e E,m.,.s /,$.- v _R b = = 3.3 '7. v com I Mw'M e/sen, Ost-t r r. Ehrla s ,I ISS N ES O STRATED De.vic.c 2 t l 8/4-#f46 ACCURACY C E W Ti m w

i. i. c l

i l i ". '

• j g. E ' s - *

,,g ( .~.

l

.;c.

x. J ACCURACY CONT'D CALCULAT!0hs Q.\\ RmTE - RCA +-c,,o7, op spy In CSA = EA + WA' Prn (sen es e re. e sbV, $7e. sM' *e. n ( acA

• cm-rt.-Ecs f4, gaf + a vc ] S s

= 0 * [ 0 - t.0% ( e + a + d) '+ d '+ o!' + { t,,o.n. ho +.s.o + 2.3P+

1. O* l *

CS/4 = 219.35 % e SPAM i 1 M*AM) shsfee, 98 6e-tu c/tgys N INSTESENT EBOfSTRATED ce,,ce 2, m kJ N NT!W '-------------"4 as 10 m a isA InvL i. e &-Q l

l n..,. ~. 1 1 l ACCURACY CONT'O I CALCULATIONS: I Can,,,, w a suvi m ua,a - S,s re-v L. ne. - '49 % w aus vece.e lt Pea. t>)es ~awsk Sew ar (ho~ cmmn Reess. -2. Vet-ae = r,4ao v e - S eocos awn - t,.c/r sens,e - % Vot-+ac en echouy s oe = li Evex,.Ts l l % re ~ L. n.,- fo.wY t s=svo,-h is.2vaes l _ Reeu aeo-Sewe,a v it 707e oe-f*u s vt a.rese

w. m A

T, me Gecu,po.nea er 2co m s roe. f s o n p i="c M -.v.c. r.r.u-o) rr, p,+ e ,+,. u l Se-oo - - fo. rov us sum % so.svu.rs i Dn rc .n ve; w e: ;,v - <,:. ~. e.- ev: se u nces vot-rses AetAv ne- { ee'On, o y M A A's or, M of r, mf. "fys y,.e i i Vt LX*Ws d f$ T&d fY h W M M YoO T A c.we - Tue acc4y is g ev u m e.y ser 37 govoc.7s tU MON rD met vW -T~rrv e r?dc;u o a t*ts es]T, T>t e L *3tAYM t".00 e d f* M VAR'/7pg M o < / c T a tS.s i v e t-s _ 50 -e ? cr 9etoet cr-soore r em en He? s %_' gg

94. @ v W = 5.61 Oc Jr.

i 05G4-'s4 6/r** I U-he cm/a R) "A 'U8 esame h@i, %tg. INSTRUIENT DEMONSTRATED ~_Q evic e 7gz,-- ACCURACY CALCULAT10N ="4,. n a ii L i ) l ) l l l 1 l l e n-mw. me-- .e

l _ _ _ _ _.. l 2.u. 1 ( ACCURACY CONT'D CALCULATIONS: l 9AsEn u pw AT-Ac % mu r4.. n4 e. SdLAY I4 S U M Q A Pf.d.*o ,c3 4c-~u 4 ra ..;i , M 70 m s A T* O29,, M scTCo e u- < <* r-i O G. H,o s A TW d 2%. ACTu,4 r s u r _a5 t on e-w. a% m. Ev n,e, n e,

93ca, 9%' *<

L 9 o) e C ~~~ v'tTL u e r%rww__ <e~peMT W M Du S' __ -ro eOANo.2e.er ,t? w v r, 7-i CA*Ed TR, P ba, >J -~~ w3 2 e_. N - 4 6.s e +2. p-N TR tf Do.a - 4 R3 % e (Qov-)6.6sv3 =7.0? v c'+.ka vi RI -~ 0 l ~~~R 4 G=a- = ba _ Ed v ou-ri i frco-v (%4o-f,. , Oh a - Tn,e p..;- - <w4, .4 kn S o_A s.r34 "R r p ) t l %v the,.o - 79.c2 v - 78. 2 v = +0. 32 v e t -s t t i D SiiN - @ 6/a1 5. &- Na 4hrhs SI 8*** NLIL*-- INSTm2Gif DEMONSTRATED De ice 2, - - - -.v. - - - - - _ I sm _L - Jta g gr a ggygg me isA emer a tie l L s,V 4

• }.

= ts:* A s t o r

l l TiWtk l4*' r' r 4 SUMARY OF RESULTS: II) I"c. cm. met svar.swi m A.wwe (cs4) IT t 19.37 7. o# vue cA,eam spw (3cy)

98. t 5.5 vo u-rs.

(N T4M7Y M A 4 e enJ 8 5 +0.31 vh ve, M+ t,2,Q (, .e seu. i D5Gn-A9ais ise W-X u chshc. VI " AhNk - AcWu- '"a*c"cun"El e"m'.E58:^#0 D e n c e A 7_ _ _. ., c. . m. t O ^ ^ ^ ^ '

waa. l l-

REFERENCES:

.T v eo,. w. % %%ouos (D hMS'Z. Svsna m C 5~1.11 - 89 tot TVA B m - m-< /n s cue En.,~~ m Ba~,o c - 47c2.2s-cecies (050NP %e

• Spa c.

\\}en o w. D o c u n en es (13 1O n ,ec.-aute 6e co. M -ecetesv 9as-ec. M e.~ s - SadP Ii1. 4 ".hh INSTIMENT DEMONSTRAfto Oe.vice 2. r samme 44 ACCURACY CALDAATIWe ,3_, ~ i n.y}; y'. u _

L Tr = . : Is.. r'. .=,s uo m t s tiussNf!5 of v.RTMt'o f G iH ~ R Al'h ELECTRIC ......'e s i e, ratw esava?.eimi CERTIFICATE OF CO' PLI ANCE International Switchboard

2 0 - 5.'.r. 6 cou..,. _. _. _ _ _ _ - _ _

c.E peg 's. .\\N2206-22S45 c.uuo,... o,o., tio. o, un n.s. conienci Ne item Oty. Appa,atus Catalog No. 5.re r.1 rJo. 1 16 JO1-5 I'otential Trans formers 33 x 12 l 1 \\ N': 1'; gea l.___ _ _ _ l CEP.TIFlCATION t.*c hetchy cettsly that the above equipn. Ort h.ns p:.ned cut regular qualsty cor. trol u spec: son anti test as attc.sted belos'. ~ t.'e he r.t.s:r cert i fy that the above transfomers have been tested for Insulation and .c.ut u ; performance and that it is sati. factory fi.r the m ' (C3.13-10c61_insulatier. ~ .n!':i.curley classes applicabic to this t runy former. Attochment No. / _ sh., /,,~z % 9/ldentiller DAhC&. 2.~7 '% i \\ (.) / .st,--/ - -o = c mi..,e sv. . _ '.....$.L' O. j L E. W l .t. Fosnn.in Oonlity Control Mana0er Ou5tity Control / ) '( n. /.../... u ~ I t 114:) .L 4 a

., s ~ REPCRT OF TEST "" GEN ER AL @ ELECTRIC oo,e or Te,, u _,y., y SOMER5WCRTH, NEW HAMPSHIRE 03878 Req. No. y7g. y g gg 5pec. Model No. -f gi m [ Cot. No. (, 9 S x y $ CUSTOMER j[~pph]pff)Ajp[ fa,,To H% n n

Ocnp,

~ Customer Order No. f/ p 9 n (g Equipment T v ry) - C Roting _ d, n H 2 7,1on.'s o o vo t 7 s in ono is i r n,< ul fInss o The following potential transformers have been tested at 60 hertz, wi,h secondary volts and burdens noted below ogainst General Electric Stonderds with results os listed: S econdary. Burden Secondary Ratio Correction Phose Angle Serial No. VA E Volts Foctor (Mi n.) O /Ro Q,'7=7 7 5 t/ O /32 c 7 7 7 6- +2 3 '7sFWO r Mn e s i, s -9 n o /Ao 0,777A e/ o 3 7t <M 7 z /32 6,79 73 rA / 1 7, s, o o i 9 -s o /.2 o

c. 7 <r 7 3~

t/ o /32 c.v/73 ~/ ~3 9/ M33 x sun s, e s s ? -/ The obove trensformeis have been tested for insulation and occuracy performance and are scrisfoetory for the ANSI (C57.13-1968) insulation and occuracy classes opplicable to this . tronsformer. //,, i certified b , f/g f,:-f Depoetment b,9799f,y< _,,,,p M j Works y Aetochenent Na / Sheet 3 4* tamp g/identHies W' C -~mg

1 . mv., r m.,1,. _ ~,.,1 :. s ca" > ;1 _ ~" I TmWe13 Standard Burdens for Fe. 6 sal Transfw=*rs e si aue n cw= = n.a.,. N=*'**'**"" i so vai s....

• • 3 Vd* 8****

vwi P., m.....- i.4,$..,,

s.,.d..<-

b .t.a= 8ada$* s.p.da p. A. r.,s on.. Hm,,. on.. (*.. He.ry. W 13 S 0 80 IIS 2 3 u42 1182 3a.4 I Old W X SS 0 70 403 2 8 002 6 74 334 4 0.364 192 Y TS 0 SS 143 2 02w 192 N4 0m H 1 Sou o es al 2 0 tot 72 30 4 0 0336 34 1.1 .ou o es 30 00$o4 34 30 2 0Olea i2 < :.)l Il m "il TsWes4 i Accuracy Clasace and CorTwpending Limalta of Transfonner Correction Factors for Posential Treasforsters for Metering Rr.-ice

• u.unas 2

..# rr...t , c--s A www.cy r cs = h.,..eoci,a30 r. -.e u.us..t r, O Li.d Pn.i.,y Vdt.gr Me. F.rs.e (Lagt.( M.a M. sered r.w.r L d 03 0 se7 04 3 003 0 904 0 e. 3.0 3.2 3 006 C 0 esa 0.6 3.0 8 082 06 3.0

s. r., s

\\ \\ I \\, T ( e.: ucauctcans A I i i ~ \\ \\ \\ U' 't"" T" i \\ T ym f\\f8accour'cuas ,. ~ ~ \\ n \\X \\ = \\ \\\\ \\\\ \\ I \\. \\ w-* \\ \\ ( T I. \\ \\ \\ l .e T 1 ... = emus annu neseres.uesin maar asas mesms.umiso Pts. 8 unen ter ? _ f cia.es sJ, s.s, and :J ser Posendel Treasteraner, for Masertas servise 199F Attochenerd W t" "'I W p/tdentifier _. 99

l a 1 L 91tOTECTlWE REU.V$ 73 *)~L* i r, Type NGV j reso i v.s R.r.y / l - s, am.,,. m s,.e - = - - = -e. w,,,,,,,.,, WHERE TC t.5E approsimaici,2 tycles ar 'cle) dvs yne.14.: vah..s..n. gh speed sharactereitse rs ehoen en '.t the drop out l'W 191% ht A re.s) n a h. I ig. J. ga,ca. The av himten perclefr me es 4 to $ watts f., 6 "/ ***l.a ?e is't y 9.*.. sieGaung, enesimuee t

• 2'
• a.tJN ttwk. pet a,=. s i e he seeitmooun y The Suity telay is time <lelay. dc

[ g. .Nrfv.s8as e i..I si.fl. ;;c The NGY19 re a undervnhage relay unh en ta high dropout 'l i ofmd este. utLit.te w aprilicauon as a dewgned opadically to inomtor the dc Q.fl *Q 18 i melts'sy amend as chary ng *upply for a st. not battery and y Ihe NOV s a a inst antaneoun. wohage. nound an alarin ( ths surely faels. The .=. oWratsJ. hen wmuutues telephone type relay sentams an estanuncous under. , g i erlay. lt immt.shle enh ame. too.or t'iree voltage unit connected to the stauon d.. e usistvistent i a.t m ernt.aie. These unets better) 4*J an aunihary time <felay emt ~ st J.,j l ere dewyned 6. t stient surrene. Where the connated to she n haricry shargmg poner stap are he N.sppfard to afternatmS* SuP9;y-In.e asessen .usrent.a bra re.tvW.wust prosuses full. Tha timedelay unit provides a mm. i Pie.1. t, soevt3_ a., aave enunca men hw nw 6.nl urvuit. he 'is. 2. In teh he.ne ami de verasons. a smum tirrw delay of swit h.s?f second after. the undervoltare uma operates It is not --aC vesio irner dede er ile ron: wmt citabhshes a .harplygletinsd set po nt controlled l*y a sensineve to 11u6tusuons in the as supply i as since ss mell stay heid in doen to 25 persent $eostal that e a snouase 1 on the front of the voltage. If the as supply feels. hoorver, the

Caseems, tiny, tanie<$elay unit drops out und sounds the Some spanine spflications for the alarm muhout waitmg for the battery andervoltape NOV reL 9 are listed tulow: voltage to desreste.

3ames ( s as

l. Instaatanenus unJirvaltage detection

~ for preferred emergency thromover control eqmpenent. CONTACT R ATING

2. Ground f.iult detection for faulted.

Close and carry E amperes de for PIS S. asevenssam.a..st asenhedge phase seierJos on uurrounded systems. tripping dut) at 250 volts dc or less. 8**"'""**

3. Phase fault deint.on for disabhns

-7 j i telephone or telem tering services at

i j stauens vt.h weak 'ustfeed on carner INTERRUPTING R ATING

_ as .'f l channels used for relay protection of i 1 other term nais- {I ; c.7" ' y he ** I~ } For Type NGV17A.17fl.17C. 88A. and

• e

,,,,,,,,,,,,,,I /. 8 s. io n 19A. the pehup voltsp: es less than 5 eij

• O

( lj jfoi fe l/ I precent h85he t un th dropout voltage. a so. o is o rs i For all other type NGt' relan, the pickup g [ e, so,.o a. +o ' 4)lias(1sless th an til per.vnt highet,jhLg, $j@ M8 go I-c s tyr6 pout, soltage. thJ tolease range ,j I i l i r i t i torn 17iDesir ning ofll e relay action to its g g e, y y W Q*y*g,, a as se see eso ser.e a.

i. a s e*

ornpleuon es arprous utely.l_percentof_ poor:4 m ind m rainas a trawd on the e ..n.'.e.a 4e e, e d e pg 3 ns. se se enese ein te. C. _he rated voltase The r:14) risk-up ume n md*L4 ace et sa mest tre ce4. WP% n I was no who ehm p graph

• SELECTION Gul0E-DC e-i j

i U9aB a .e l i t _. ~ m. n ;u .*a-a;? i a js ia!m ,s ..,es l i=a i W "'" gg _g;g" ya irc. o-o m> : cc : c g irc. :-- a. u 'eM: ""'"*:12 ira j? s, I i.u, c i-

3 ;;;g I'

-c ..a. i SN smeaded e eer es nu er e she HGAll retsy. Add -F'* to Model No for arme.ituna moissting Eaampie IJNGV25A 48 8 8 How to Ords. . $snaen 7:10 prwes. . Sensee 7.:.' A et ,w-5 sw_! d F- ?,te,s, s.d. t,.,.";"':: Mets::.: ::2::Pt % m**,* neu.ce 2n , e r.....e r u.. - Saars Od%se. . 5sneen th Samh Cesar een c. .e

a. me n

i. M tus==.*

• emme aimes an =

[ a,,,,g,ym nmum umasate sticnie r Twee I L l

~. 8 t PROTICTIVE RTLAYS Type NGV r ,,.v.. v.a. a.i.y asu .u. -.. m,,, _

• SEttCTION GUlOf--Ac

(.. _c_ . a.. _. _ .a --.,,.c,,, J.:. r-*.'-- .u.;r c _._. e. m -I ~ ' r'. ~ i. l "g, ", 7 -. Nil .,..=. ! i x... I. ~ a. -l a 'a n - m m. i.. i uc a .~.~.__.n..e. ,fI " *E ' 88 ' 3' f .g.. .l 1 } : *. ** .I.U,'I. 'I.' 38'.a ^3*. j

i

, -c:,:.. ++++ .. ~ l:, w, n_ .i m m I-

I h.R "'"

... f I.... _.. a 1/i t .u i ,8.51 l.'; %j '. -,. -.t,ij:t,nl,j . l-l

l l.

..n, t = i, l ll i 1 l2 !l. ~'a'a ; (+++

• '** i :

'ia 'a i= =,. ... i .... I 2. i x....... .I .i-.. ....in /. 1, u ++++ ,,,o, .n..... -....,. 1 ... i . l.. (D.s. ia. d.Mw d.y. b. t t.rg.LE i. ci.m.w.d w = = Q l. ih. (fbrtT-u t ret.yk. Lib. rnb.lly L.C1..R.W.d 18 8.

• 8MW P,

in. 3 .d se my s.w.= s. c -..a it r uy. e m.w.d.m s.L .w

• STAllON B A FTfaY MO VITORING

. M,' T.'" l 5.**.a i c l l Wy c,, n. w. l l e., } ge. .e-e.e eu se n* i9 8 ab.. 53 1,oes.ie s. g 5 5+&. 9,

lt:0

'0 u s' '== 'a= 3 W ym O W, t f., 2."7 t r o' m

n. 4 im stateat$ELicinic g

I l c 9 I s

i j g7 m,g alltiuep:/p dori ^c 1 I I B g i j i Ilittill i E I I I I I I I 1 = i s I 3 3 I I,1 2 =

: i

= n naaa nn ll1 1 1 1 1 1 1 1 Of i l e e a e a a e n ~ im, i i : : : : : : 3 a = a a a== a 1 l l m lE [

f;

~ ~ I E E E !IiE E 3. or 5 E =E !I!I!III: !I i I I 83 83 83 83 83 Ei,z ,H, z 53 83 la }I 8 8 a l E la g.6k$ I f l! I i: n 1 si i; 21 si 11 e is,; l l~!ag 2: g IfSI [ bo a ? l M e e .?- '

t-pfg d*llisuopty 3, jo y eseys oN +Suetut so i i e i a j 111 1 ! I i= a i gi I sa a / sa as ] 3 3 3 II i 1 11 / Is=ii's in a ri a un \\n na un ll 11131 11 11 1 -.s )s /a a aa = E! E a = m i,s !!I,s ! i 1 = n === = = a; } i E== a = =

== i i .E E. l l { EE (! 5 j,e 2 l EEE N E EE E. e s I' k k ) I3 / y} E 88! ! HE E 82 cresE 83 E8 t i i !/ )1 1

I 3

l. ' "! zI a =- h -1 8j s .s

== I-Il n = a I .s "a 15kl e

2:

E e 72 al

I l APPROVAL ,,0 v= aan d ' I /8 * .._am_. -e.as.m ._eess g,,, n.sh.as mer imponiaries amo serrass. esimaa l I b.t t tag. L te..llem

• 7-
• M ^- - Wi --*

L.La..e D.343 pp _ A_A. Eh i e ra_ 9.to [ m at frone.t 4 1,_am e-ia tama t ' ^ 1A i sa e e.. - - n -i--a A. I.p. s.-__ _1 v.:.. Dr lap..a..e fam. 4.. 8 3. 9 41 pp.n _ h.e4 la 44.9.8.) a.: = tr s _ Deerst Las [ er.i. .tLa D.4.ae

e..

sia r 4 astar mara RCP CLFS 1 _l er,. t n,.., a= 1."^ amier ' %-6staaJ ame.1_ l nTB9 Bio-WIM

• 9 -

p see W1-i.r- __1.-- m-i--_ ..as:_ W _6 1 y as per 1

• -. i n - **- =- i - -

c.m.1.5 h. s .L. - ' i- - ma i -- i, N 9 _.... os.. _3 W.a =" a* t.... ~ ~..nsese vs ameese, enre _.. e_i r 4 i e m. i i v.ts .... i.. c.. are nas. 7 . e er,. a n.

1. fis en imma sua.et__....22po.laov..

Dep.1 gov _ vr een k'D ' 4 i l 3 i seter arrismes 7 seittas I a.s.,p w is ... v.a e es a, c se.. Pet. v i., y seu tee w ne w 1 e- - r

m. i -

% nn yi - eeng set,vn== at it h*- g -,_3.-- m.i-- I M E ~ h M = i' 9t)f =' - h'--- i w.?Len = = - "- 4 .. {.. La w fium 13 T to l DJ t .,,.. a , h rggs -

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,.i. [ er * ~. w ie-y 'ang.ng ttage 'a.lar at (r 95 m i-tetA1 = t3= w. a. i 4 ' ' ~ ~ t l 3.n.ces.,,,,jgestar trim im initialgi thian at,,lmgt 2 east af b rematae ^--'^-* l, ampartaamm a 3 1*-- Am== ta 7t$ g(M amminal val *-. l ~ -- i i.. _ i.. . i u r ggsagov g --ain--.=a _i-h 0.8 - ^ la 1A p 1*=. i --Affoch ;,;,0 f!; Y $' ^ ^^ 5 ^# l g ggy CD'\\ C C ~~' ? - ( l i t l I i 1 l t l 6 1

e ,e Sequoyah Nuclear Plant DISTRIBUTION 1C Plant Master File Plant Superintendent Assistant Plant Supt. (Oper. ) 14 Assistant Plant Supt. (Maint.) Administrative Supervisor DPSD Maintenance Supervisor (M) SFF.CIFIC ftAINTENMCI INSPUCT!O4 Assistant Nintenance Superviwr (M) Maintenance Supervisor (E) Assistant Maintenance Supervisor (E) DPSO-SMI-3-RUV Maintenance Supervisor (I) Engineering Supervisor REACT 0R COOLANT PLMP (RCP) UNDERVOLTAGE Operations supervisor RELAY CALIBRATION Quality Assurance Supervisor Health Physics Public Safety Services Supv. Chief Storekeeper Preop Test Program Coordinator Field Services Supervisor Chemical Engineer (Engineering) Radiochem I.aboratory Instrument Shop Reactor Engineer (Engineering) Instrument Engineer (Maint. (I)) Mechanical Engineer (Engineering) Field Services Supervisor Training Center Coordinator IC PSO - Chickamauga Engrg Unit - SNP Prepared By: James A. Dunlap Public Safety Services - SNP IC Shif t Engineer's Office Revised By: Bqbbye/ Maloop _IC Unit Control Room N Submitted B. M th ysics Laboratory W/Sugsor Asst Dir NUC PR (Oper), 727 EB-C 3/85 /M IU Nelr Document Control Unit, 606 RB-C / PORC Review: IU Plant Supt., WBNP Cat'e / Plant Supt., BFNP Plant Supt., BEh) IU m N 174C-K i Approved By: h tk. A 'k Supv., NPtin nvu, MS Plant Manager i NRC-IE:II Power Security Officer, 620 CST 2-C W/cD /NcL Ncir Materials Coord - 1410 Ct3B-C Date Approved: Manager, OP-QA&A Staf f / / Resident NRC Inspector - SNP IC NSRS, 249A IfBB-K Technical Support Center IU System Eng Svs Branch The current revision level of this instructio'n is: 2 R:sson for current revision (include all temporary change numbers) Procedure E recuracy improvement. The last page of this instruction is neber 3 pgochment Ho=- 4 . - uw e

3 Sequoyah Nuclear Plant DPS0 SPECIFIC MAINTINANCE DSTRUCTION Cover Sheet Page 2 DPSO-SMI-3-RUV F History of Revisions Rev. No. Date Revised Pages Rev. No., Date Revised Pages 0 2/26/79 ALL 1 6/15/31 2 ? 2 f-AH L All 2 ~ i e e i l l I 9 l s. l W No- - t_q g/ldentillef _ \\

SQh? o. DPSO-SMI-3-RUV Page 1 of 3 Rev. 2 l RCP UNDERVOLTAGE REIAY CALIBRATION I Date r { l. Equipesent Identification: Reactor Coolant Pu.rp (RCP) Undervoltage Relay, 6.91V Auxiliary Power Panel ,th =nel , Device 27 2. Unit Number: System: 202 3. Approved Maintenance Request Number 4. Plant Technical Specifications are considered and permission to work is granted. Verified by: / Shift Engineer Date F 5. Prerequisites: Verify the following status and alarm lights are not lit: g (Exception: If unit is "off-line" lights may be normally lit. If so, enter " Lights on-unit off-line".) Trip Status lights, panel H-6. a. 1. "RCP Bus 1 Undervoltage," panel H-55-6A, window 1 2. "RCP Bus 2 Undervoltage", Panel H-55-6A, window 21 3. "RCP Bus 3 Undervoltage", panel U-55-6A, window 41 4. "RCP Bus 4 Undervoltage," panel U-55-6A, window 61 b. Reactor Protection and Safeguards, panel M-6 1. "RCP Bus Underfrequency/Undervoltage," panel IA-55-6A, window 32 'r L Verified not lit by 6. Precautions: Test one RCP undervoltage relay at a rime. 7. References (a) DPSO-Q1I-3 (b) TVA Drawing 455763-2, 453721-1 and 2 5 (c) DPSO - Field Test Mm===1, Section D-14 6 (d) Relay setting sheet (s): 8. Test Procedures: Using critical settings given in reference (d), examiw ~ .g relay and calibrate as instructed in references (a) and (c) and as follows: a. Place the RCP test switch ES in the test (trip) position. Verified By m,w V & [IE Loop d/lderwik N' O

e-SQNP DPSO-SNI-3-RUV L Page 2 of 3 Rev. 2 Date RCP 1 Channel I HS-68-343 RCP 3 Channel III ES-68-347 RCP 2 Channel II HS-68-345 RCP 4 Channel IV RS-68-349 ~' 'EFre. NOTE: Place only the switch of the channel being tested to the test position. Two of foer is caly needed to trip reactor. A. g F ~' g b. Verify the following status and alarse lights are lit: 1. "RCP Bus Undervoltage", trip status lights, panel M-6, II-55-6A, window Verified By 2. "RCP Bus Underfrequency/Undervoltage", reactor protection and ,r-safeguards, panel M-6, IA-55-6A, vindov 32. L Verified by ~ Verify the following computer alarm actuation: c. Pt. Number V032 D "RCP Bus Undervolt Part RE* 4 Verified by RCP Bus 1 PT. No. V0320D RCP Bus 2 PT. No. V0321D RCP Bus 3 PT. No. V0322D RCP Bus 4 Pr. No. V0323D d. Calibrate undervoltage relay and timer and record data oc form 6471 or 6472. Perfor:a response time test if required, (DPSO-SMI-RTUV). e. Verified required /not required by: 9. Acceptance Criteria and Documentation: Device 27, Type NGV13B, Relay pichap is within 11.0 percent of R a. setting sheet value. ['- T h Verified By 0 4 b. Physical ermaination of relay satisfactory. [ ~ Verified By 4 1 E'

10. Return relay to normal service.

u Verified By $iE I ?

11. Return the RCP test switch to the normal position.

3't 3 ' 4 5D Verified By fp, J 1:.3 e

e* MR DPSO-SMI-3-RUV ' t."* Pege 3 of 3 Rev. 2 P Date %. s 7 12. Verify the status and alare lights in step 5 (Prerequisites) are not lit. Verified By i 13. Verifiy the computer alarm in step 8C returned to aermal. r Verified By 1 14 Shif t Engineer and Uait Operator notified test ecuplete, r Verified By / i-Shif t Engineer Date [ Verified By / L Unit Operator Date 15. Post test requirements: NOME

16. Data approved by DPSO:

/ Supervisor Date E l P L L r i MM> ment No 5 _w6 4gm t% f/ identifier M V/CF 27 O

G 1-90805 Undervoltag? R21ayo Typa NGV ( 9 I e s e t. 3i a i a 1 s. t 3 T? 1"O b' s o-- N ,Q 's, T s, a m s s N \\ \\ \\ \\ \\ \\ 8 h s \\ \\ i a \\ \\ \\ l o ( L \\ \\ t i \\ \\ 1 c. t 1 ( (- g a 5 3_ \\ \\ = e g 2 \\ l -y e \\ l \\ E r

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• Fig. 9 (0165A7560-1) Operating Time Curves for the NGV Relays
• Denotes change since superseded issu *.Attochment No,

$heet I of ' 8 Loop #/ldentifier D# I

t ENCLOSURE 3 SIGNIFICANT HAZARDS CONSIDERATIONS 1. Is the probability of an occurrence or the consequences of an accident previously evaluated in the safety analysis report significantly increased? No. The change in the trip setpoint and allowable value for the reactor coolant pump undervoltage reactor protection channel to account for overall channel accuracy and measurement and test errors ensures proper operation of this protection function. The change in setpoint decreases the consequences of accidents or transients for which this channel provides protection. The change in setpoint has no effect on the probability of such transients or accidents occurring. 2. Is the possibility for an accident of a new or different type than evaluated previously in the safety analysis report created? No. The change in the trip setpoint and allowable values for the reactor coolant pump undervoltage reactor protection channel ensures that the technical specifidation trip setpoint is conservative with respect to the safety limit. No hardware changes were made. No new or different types of accidents have been introduced by this change in setpoint. 3. Is the margin of safety significantly reduced? No. The change in the trip setpoint and allowable values for the reactor coolant pump undervoltage reactor protection channel is conservative. The effects of measurement and test errors have been included in the overall channel accuracy. The increase in the trip setpoint increases the margin of safety. 4 O}}