ML19254F981
| ML19254F981 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 01/15/1980 |
| From: | Olson R BALTIMORE GAS & ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001170339 | |
| Download: ML19254F981 (4) | |
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S A LTIMORE GAS AND ELECTRIC CHARLS1 CENTER. P.O. BOX 1475 BALTIMCRE. MARYLAND 21203 January 15, 1980 c: ctme cNamesw.a o PARTW NT Office of Nucles: Reactor ?egulatie U. S. Nuclear ?egrlatery Cc=.issie:
- 'ashington, L. C 20555 a
Atta: Mr. D. G. Zisenhut, Acting Director Dirisio: # Operating Reactors
Subject:
Calvert Cliffs Nuclear Pover Flant Units Jos. 1 & 2, Dochets Nos. 50-317 & 50-318 N?0 Recuir==ents for Aux Feed S'rste.s
Reference:
a) NEC letter dated 11/7/79 frem Eisenhut to Luntrall, sa=e subject.
b) 3GLI letter dated 12/26/79 frc= Olson to Eisenhut, sa e subject.
Ge lemen:
Refere=e (a) requested that ve pre ride certain infor=stic:
ec:cerning the Autillary Feetrater Syste=s at Calvert Cliffs an provide a schedule for sub:ittal of certain other infor=stic: c= the sa=e subject, including preposed Technical Specificatices.
I Reference (b) ve stated that the preecard technics 1 specifications and other infor=atio: vould be processed throuih inheuse reviews and sub=i' tel to NRC by Ja=uary 15, 1980.
Inclosed is the i=for=ation c= our existing suxiliary Feedvater syste=s requested in e=c'esure 2 of Reference (a).
r proposed Technical Specifi-caticas vill be s:bmitted to ';20 by January
,1980.
We arolegize for a=7 ince venience :his =ev schedule =ay ea'm e.
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Ve:.e truly yours,
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?. C. ~. Olson Ser.icr Ingineer EC*0/s=n ec:
J. A. 3iddisc:, Esquire G. F. 2-evbri'.ge, Isquire Messrs. I. L. Conner, Jr.
gh P. V. T. ruse - CE J. W. 3uthers - 3echtel t
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Auxiliary Feedvater Desig 3 asis Infor=atica la.
Identiff the plant trusie:t and acei: lent eca:iiticas considered in establishing A WS flov require =ents, heet (a) Ioss of =ain feedvater
)
treated in FSAR Main stea= isolatiet. valve closure J as one analysis I
heat (b) Plant cooldov:
j lb.
Describe the plant protectien acceptance criteria a:d corresposciing technical basis used for each initiating event identified above.
hest (a) Criteria:
1.
Maintain a DN3 ratio above the DNB SAFDL li=it based on TCRC C2-1 correlation.
2.
Restrict reactor ecolant syste= (RCS) cocidov rate to a -av'm:= of IC00F/hr.
3.
Maintain stes= generator inventory to allev 10 =inutes for =anual initiatics of the auxilia y feedvater syste=.
h.
RCS pressure is maintained under 110",of desig: pressure.
heat (b) Criteria:
1.
Cool the pr'-a y syste= to 300 ?.
0 2.
Describe the analyses and assu=ptic s and corresponding technical justification used with plant conditions censidered in la above, including:
a.
Va v' m" reacter pcver (including instru=ect er cr allevance) at the ti=e o'
- '-a 3 ati:g event er ac::ident. hents (a) and (b): 275h Mvt including 25 allevance fer inst: ment error, b.
T1=e delay Pre = initiating event to reactor trip.
heat (a):
16.6 seconds.
Plant pars =eter(s) which initiates A'a S flev and ti=c delay c.
between initiating event anci introductie of AWS " lev into stea:
generater(s). Dents (a) a=:1 (b): AF*iS is initiated ~~~ually.
Procedures are written te notify cperaters to actuate AFiS urca receipt of stea= generater icv level alar =.
d.
Nc=inal stea= generator water level vhea '-#ating event occurs (See 2e).
e.
Initial stess generator vater inventory a d depletion rate before and after FJS flov ec=ences identiff reactor iecay heat used.
Prents (a) and (b):
Stes= Generator Invento:r hil Pever Liquid (lbs) 121,106 Stess (lb=)
9,k86 Total (its) lh0,592 Total decay heat k.8 x 100 3 W for the first 90 minutes after shutdovn.
Stea-d"g rate (auxiliary feedvater that is boiled off once it e=ters the ruptured stess generator) h29 lt:s/sec.
Max 1==2 steam flov rate prior to initiating auxilia.f fece..ater occurs prior to the trip and is 9h15 lb=/sec.
f.
Me" -- pressure at which steam is released fre= stes= generator (s) and against which the FJ pu=p =ust develop sufficient head.
Prent (a): 1026 psia; 2k.5 seconds after the event.
g.
Mini =us number ~ of steam generators that =ust receire F# flov.
Prent (a):
5% of full feedvater flev to both stes= generators was assu=ed for the current analysis.
h.
RC Flov Condition.
Prent (a): Continued operation of RC pu=es.
1.
.Vnd -" Fi inlet te=perature.
Prent (a) and (b): 900?.
- j. Folloving a postulated stes= break, ti=e delay assu=ed to isolate break and direct F4 flev to intact steam resera.ter(s). FJ ru=o flov capacity allovance to acco=odate *
-d e delay and =ai tain mini stes= generator vater level. Also identi^r credit taken for pr*-5 / system heat re= oval due to blevdev::
Prent (a)-
- e delay asst =ed was 10 =i=utes.
2.
No credit vas taken for pri=a y sfstes heat removal due to blevdov=.
k.
Volt =e and raxi:u: te=perature of ter is nain feed lines betveen stens generator (s) and F45 ce rection to rain feed line. Not applicable.
1.
Operating eendition of stess generator no-='
%' avdov: folleving initiati=g event.
Prents (a) as:1 (b): Nor=cl blevdov: is 25 GFM folleving initiating event.
=.
?-d-' / and seconda f syste= vater s=:1 =etal sensible heat used for cooldov and Fi flov sizing.
0 1.63 x 10 3"'U/c? - See UIC2 sub=ittal.
n.
5.=e at hot standby and ti=e to cooldovn RCS to RER syste= to cut in te=perature to size F4 vater source inventory.
Ad. justing the 0
feedva+,er *lov to the pe:.issible cooldovn rate of 10C F/hr.,
decay heat renoval and cocidovn if both units can be acec=mlished in six hours, with the =ini: ras a= cunt of vater available (300,000 gallons). *his a= cunt of vater is also adequate to re=ove decay heat f es both units for = ore than ten hours after initiation of cocidown and still =aintain nor.al co-lead vater level in the st.tas generators.
3.
7eri*y tlat the F# pu=ps in yeur plant vill supply the necessary flov to the steam generator (s) as deter =ined by ite=s 1 and 2 above considering a single failure. Identify the =argin in sizing the pu=p flov to allov for punp recirculation flov, seal leakage and pt..p vear..
"he auxiliaz f feed pu=es are rated at 700 gym vith a total dynamic head of 2hCO feet. Ti*ty gallces per inute are required for continuous recirculation. Resistance for valves, no::les and piping require a pu=p vith a ni"#
s head of 2360 feet.
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