ML18227D187

Letter Safety Injection System

ML18227D187
Person / Time
Site:	Turkey Point
Issue date:	04/10/1975
From:	Robert E. Uhrig Florida Power & Light Co
To:	Elliott D Office of Nuclear Reactor Regulation
References
Download: ML18227D187 (8)

Text

NRC DISTRI UTIOM FOR PART ar) DOL,'.iET I'1ATt RIAL (TEAIPORARY FORVi)

~

CONlROL NO:

I FlLE poor,ida,.Power 6 Tight Miami,, Pl'a R E Uhrig DAl'E OF DOC 4-"10-75 DATE REC'D 4-15-75 TWX RPT OT'HE R'r

.Elliott ORIG one signed CC OTHER SEiJT AEC PDR

'SENT LOCAL PDR CLASS UNCLASS P.ROP. INFO IN PsUT

.DESCRIP TION

Ltr re our 4-1-75-,,telephone Conversation'.....

furn'ishing info.concerning the scKesty injectio syst'm at Turkey Point NO CYS REC'D 1

ENCLOSURES:

DOCKET NO'5'0 250'

'i

s. ~

~ '.'

~

PLANT NAME Turkey, Point 3 & 4 s

FOR ACTIOi"/INFORis ATION 4-21-'75 eh f BUTLER (L) hV/ Copies CLARK (L)

Vi'/ Copies f Al)R (L')

~,ll &vi)siio

};r.iiEL(L) is!/ Copies SC}.I'P/E fiICEB (L) 1/i// Copies STOLZ (L) 0V/ Copies 7!/'s.'SS'AL Li0 (L) vol L vpies PU f<P LF, (L)

N/ Copies ZlEi 1ANNi (L)

W/ Copies DICKER (:)

W/ Copi.s KNIGHs'iOui (El Vii/ Copies YOUNGB LOG0 N/ Copies REGAN (E)

LV/ Copies LEAR (L)

~ Vii/copies Sr'E'

\\V/, Copies, (E)

V.i/ Copies INTERii!AL DiS1 RIBJTION

~ I'iif<C f'DR

~OGC, ROOs';1 P-5QGA GOSSICix/STAf-F

~ G I Ai'.1BUSSO

~ BOYD

-'AOOf3r."(L)

DLYOUNG (I )

Sl'OVHOLl (L)

GOLI..EI) (L) (Ltr)

P. CO I. LliiS DENISE f<f-:G Oi~g 4-II L 7; f3EGION (2)

T.R. 'V,'ILSQN STr;r=LE TECH REVIE'i/

SChffOE 0= n ViACCA BY KNIGHT PAi,"LICKI Sl-IAO sTL u.o.C>')

~ tIOUST6'C

~OVAK w.ROSS irt nLITO "TEDESCO LONG LAINAS 8 E fbiAfi0 YA YOLLh'iF. R DENTO"'R I".iES GAfi1MILL KASTNEB BALLAR0 SPANGLE B F. NVIBO fi/iUL LEii DICKf=fi KNI6HI'ON YOUi"6 B LCOD BEGAN f'ROJECT LDR HAHLESS LIC ASST R. DiGGS(L)..

H. GEAR IN (L)

F. GOULBOU'Ri!E (L)

P. KRiEUTZER (E)

>. <.r:r: (L) f ~..I.~AICf,LT (l )

S. fiEED (E)

M. SL.RVICE (L)

S. Sl IEf'pihfiD (L)

M. SLA1ERi (E)

H. Si IITII(L)

S. 1CETS (L)

G. O'ILLIAilS(6)

V. V~'ILSOil (L)

~ R. INGfiAi<1 (L)

A/T li'!D.

B }3A I1't'iA"-

SA LTZs'.JAN

..Mf-:LTZ.

PLA~!S fi'ICDONA LB'HAP(ii AN DURE (Ltr)

E. COUPE PETE. RSO'!A}ITFIE LD (2) IiLECKER EISE f"I'IUT 'iilGG li'!TON g pgp Q,r> EX1FfiiNALD!S1 RIBUTION ~1 LOCAL f'DB L4e>~ ~ -"T!C (ABERisIATISY) (l)(2)('IO) NATIOswAL LABS i'1 NSIC (})UC){ANAN) I, f'F.NNI.~;GTQ,'u, fin> E.201 GT 1 ASLB COi'iSULTri'4 i' > - Neivton An;!erson f1EliVihlhf<K/BLUi';IE/AGBABIAlil pL/;- ACfiS }W-IMBfSENT '.g- ~Five ~ ~ ~ 4 +9J PDfi SAN'LA/fxY f3ROOV.HAVEil"i 'iT L'isB G. ULflliiSO",C.""'L AGP }ED (RUTH QL:SS.".i:ii: f1in B-I?7 GT J. D. 1<LiNKLE>. Rrn E.20 i

%y

.2 FLORIDA POWER

Qd-8 LIGHT COMPANY April 10, 1975 L-75-180 i.:r. Donald Klliott Division of Reactor Licensing Operating Reactors Branch Office of Nuclear Reaccor Regulation U.

S. Nuclear Regulatory Commission Uashington, D. C. 20555

Dear Nlr. Elliott:

Re: Turlcey Point Units 3 6c 4 Safety Injection System Doclcet Nos. 50-250 6 50-251 This letter is submitted to reply.to questions asked in your telephone conversation of Apxil 1, 1975, with G. E. Liebler. 1. Valves 3-862A and B, 3-864A and B, 3-865A, B and C, 4-862A and B, 4-864A and B, and 4-865A, B and C, are "locked" in the open posit:ion by having their circuit breakers locked open at the i'lotor Control Centers. 2. Only one RHST is required to satis y "he core cooling requirements during a loss of coolant accident:. The RMST water is not required for a normal shutdown of the plant:. The ROAST can be utilized as an emergency makeup supply to the primary system via t:he CVCS charging pumps in the event of a loss of t:he normal supply.

Ilowever, such makeup would involve only a fraction of the tanlc contents and would be considerably less than tne amount required t:o sat:isfy the core cooling requixements.

3. As mentioned in item no. 1 above, t:he accumulatory isolation valves (865A, B and C) are open and have tneix'ircuit breakers loclced open at the motor control centers. These valves are not provided with a pressure interlock that mill automatically open them when pressure.in the RCS is increased above a certain value. Control of these valves to ensure that they are in the proper.position with the circuit breakers locked open is accomplished administratively by specific instructions in the plant operating procedures. IIELPINQ BUILD FLOIIIDA

0'

>'ir. Donald Elli April 10, 1975 4. Valve HCV-758 in the Residual Heat Removal System normally functions to control the flow of reactor coolant through the Resi'dual Heat Removal Heat. exchangers during a normal plant cooldown and thus control the rate of cooldown of the Reactor Coolant System. When the system is functioning as the low nead Safety Injection System valve HCV-758 is required to be in the position correspondi'ng to its fixed linit of travel in the open direction. In th'is position valve HCV-758 will pass t:he required flow during the injection phase of a loss of coolant accident and will also ensure that adequate flow is provided during post accident recirculation without exceeding the allowable Net Positive Suction Head for tne RHR pumps while pumpiag an assumed saturated fluid from the containment suinp. Valve HCV-758 receives a signal to "fully open" upon -..nitiation of the Safety Injection signal. Valve HCV-758 will also go to this "fully open" position in the event of a failure of the ai" supply or a failure of the power supply to the solenoid. During normal operat'ion, the air supply to the valve is'hut off, causing the valve to assume the proper position for its Safety Injection System function. Very truly yours, lh ' /'1 / Robert E. Uhrig Vice President REU:HNP:nch cc: iver. Jack R. Newman

I; v. 5OA UidlviP, AIIAklL&LohiuA JJ1QI -~r~~~m ~>> ~g~ e ,, ~ ~ ~ FLORIDA POWER 5 LIGHT COb1PAIIY April 10, 1975 L-75-180 i=:r. Donald Klliott Division of Reactor Licensing Operating Reactors Branch Office of Nucleax Reaccor Regulation U. S. Nuclear Regulatory Commission Uashington, D. C. 20555 Dear ~lx. Elliott Re: Turkey Point Units 3 6 4 Safety Tnjection System Docket Nos. 50-250 6 50-251 This lettex is submitted to reply to questions asked in your telephone conversation of April 1, 1975, ziti G. E. Liebler. l. Ualves 3-862A and B, 3-864A and B, 3-865A, B and C, 4-862A and B, 4-864A and B, and 4-865A, B and C, axe "locked" in the open position by having their circuit breakers locked open at the I'.iotox Control Centers. 2. Only one Rl".ST is xequired to satisfy the core cooling requirements during a loss of coolant accident. The RblST water is not required for a normal shutdovn of the plant.. The RUST can be utilized as an emergency makeup supply to the pximary system via the CVCS charging pumps in the event of a loss of the normal supply.

However, such makeup t;-ould "'nvolve only a fraction of the tank contents and r~ould be considerably less than the amount required to satisfy the core cooling requirements.

3. As mentioned in item no. 1 above, the accumulatory isolation valves (865A, B and C) are open and have their circuit breakers locked open at the motox control centers. These valves are not provided with a pressure interlock that vill automatically open them when pressure in the RCS is increased above a certain value. Control of these valves to ensure that they are in the proper position with the circuit breakers locked open is accomplished administratively by specific instructions in the plant operating procedures. HELPING BUILD FLORIDA

~ sir. Donald Ellio April 10, 1975 4. Valve HCV-758 in the Residual Heat Removal System normally functions to control the flow of reactor coolant through the Residual Heat Removal Heat exchangers during a normal plant cooldown and thus control the rate of cooldown of the Reactor Coolant System. Mhen the system is functioning as the low nead Safety Injection System valve HCV-758 is required to be in the position corresponding to its fixed limit of travel in the open direction. In this position valve HCV-758 will pass the required flow during the injection phase of a loss of coolant accident and will also ensure that adequate flow is provided during post accident recirculation without exceeding the allowable Net Positive Suction Head for tne BUR pumps while pumping an assumed saturated fluid from the containment suinp. Valve PCV-758 receives a signal to "."ully open" upon .=.nitiat.ion of the. Safety Injection sional. Valve HCV-758 will also go to this "fully open" position in the event of a failure of the ai" supply or a failure of the power su~ply to the solenoid. During normal operation, the air supply to the valve is shut off, causing the valve to assume th~ proper position for its Safety Injection System function. Very truly yours, 1,p jj/' 'C /'".'i tq /'obert E. Uhrig Vice President PZU: HNP: nch cc; iver.. Jack R. Newman}}