ML20097G465
| ML20097G465 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 09/12/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8409200018 | |
| Download: ML20097G465 (8) | |
Text
____ _ _.
PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 (215)841-4502 V IC E-PR ESID E N T ensema a nsase amo mass ancw Docket Nos. 50-352 g[p 1 2 1984 50-353 Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Ca mission Washington, DC 20555
Subject:
Limerick Generating Station, Units 1 & 2 Information for Containment Systems Branch (CSB)
Primary Containnent Negative Pressure Design Limit
Reference:
9/7/84 Meeting Between PECo and NRC File:
GOVT l-1 (NRC)
Dear Mr. Schwencer:
Attached are draft changes to FSAR Section 6.2.1.1.4, Table 6.2-9 and Figures 6.2-19, 20 which are being made as a result of discussions at the referenced meeting.
The information contained on these draft FSAR changes will be incorporated into the FSAR, exactly as it appears on the attachments, in the revision scheduled for Septenber, 1984.
Sincerely, DAA/anv/09108413 Attachment Copy to: See Attached Service I st 8409200018 840912 PDR ADOCK 05000352 A
PDR hool
( _. _.
'l I
G A
cc: Judge Lawrence Brenner (w/o enclosure)
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-Judge Christine N. Kohl (w/o enclosure)
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.(w/o enclosure)
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(w/o enclosure)
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Director, Penna. Emergency (w/o enclosure) l Management Agency Angus R. Love, Esq.
'(w/o enclosure)
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(w/o enclosure) day M. Gutierrez, Esq.
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/
F6 -60 DRAFT g
The inherent conservatisms of this model are: to neglect transfer of sensible heat energy from equipment and structures to the drywell vapor region, to disallow reevaporation of the" condensed drywell steam, to maintain a large volume for the drywell region by transferring condensed steam mass directly to the adppression pool, and to require saturated randitions in the orimary ctmtainment vanor ranio e JE ndinge n th last onserv
- ism, r 1.or con tions ring w ch uper ted iro nt is esen initi y, it possi e
et a w sh t-te drop i vapo regi press e.
Th de is as ciate with superh ting he at com nt; th ene for is pr ess e es fro the n
conden ale co nen Thi educe the v r reg n
and oceed until e va r
empera e, and ence ressuy,ively or ce t
ot'sp y wate (e.g 800F) regio satu-ed.
thi ort-tg pre re de can i fact ve the axim ne
.ve pr ure.
owev for es wh ein re tive cold s;
y wat is us (e.g 500F) e max:
um ne iva essure s =j-e long era pr sure.
or th situ
,on, a igh y ative humidi is co ervati Th*
is the ase f LGS and henc justi es the ssumpt n of M ondit ns f the p ary 1
con inment por re
- ons, th ini 11y the hout tr sient.
In addition to the modeling conservatisms, initial conditions for i
the primary containment are also chosen to induce conservatism in the analysis.
The presence of any noncondensables in the drywell tends to hold-up the depressurization rate of this region following spray actuation.
Thus, a condition is postulated wherein a small break occurs within the drywell serving to pressurize this region and drive all the noncondensables to the wetwell vapor space.
This sets the initial pressure distribution
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and, along with the assumptions regarding saturated conditions for the steam phase, the temperature distribution for all three regions - drywell, wetwell vapor' region, and suppression pool.
These initial conditions are presented under the heading "to" in Table 6.2-9.
The results of this analysis are illustrated in Figures 6.2-19
~
and 6.2-20.
Again, these results indicate a maximum negative t
drywell pressure of -4.3 psig.
e 6.2.1.1.5 Steam Bypass of the Suppression Pool 6.2.1.1.5.1 Protection Against Bypass Paths The pressure boundary between drywell and suppression chamber including the downcomers is fabricated, erected, and inspected in accordance with the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code Section III, Subsection NC, 1971 Edition.
This special construction,
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inspection, and quality control ensures the integrity of this boundary.
The design pressure differential and temperature for
4 f6-6//
D 9" A F T TABLE 6.2-9 INITIAL AND BOUNDARY CONDITIONS FOR DRYWELL SPRAY ACTUATION ANALYSIS l
t_oo(8) to(a)
Drywell (b
Volumed,ft3 ZVZ8&O d, -:- M P 742800 Pressure, psia M7 6 6.
5 5 G' '
Temperature, OF s36 *Mk
-eess@ 20o.3 Relative humidity, %
9 499' 100 Spray rate, gpm/ number of trains 0/0 9500/1 Wctwell Volume - Vapor regionca), ft3 l'37 s 4 2 - -, : :--
27,:;- #37s31
- Suppression pool (3), ft3 IK 7 f#7 6 "Wir 12 7To 7 Pressure, psia i3.7'845p8-
_N 31.16 Temperature ~, OF 50 50 Relative humidity, %
100 100 Suppression pool free surface area, ft244;4W W 9974-Wetwell-to-Drywell Vacuum Breakers Number of valve assemblies 3 of 4 Flow area per assembly, ft2 2.05 Flow coefficient M
.:Q93.446 Vacuum breakee -'in; pressurd9(psid)
F 4:48
~ li gen RHR System - Drywell Sprav Mode Service water flow rate, gpm 9000 Service water temperature, CF
-32
40 Heat exchanger effectiveness 0.249 (8) Initial conditions prior to small break as discussed in Section 6.2.1.1.4.4 (2) Conditions after small break, preceding drywell spray tlh m( 3) 1intt water level actuation (see Section 6.2.1.1.4.4).
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LIMERICK GENER ATING STATION UNITS 1 AND 2 FINAL SAFETY ANALY.e:S REPORT DRYWELL PRESSURE RESPONSE TO SPRAY ACTUATION FIGURE 6.219
J DRAET
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5.M BEGIN8 TO 09EN E
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DRiWE PPESURE= -4.206 PC'O no
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LIMERICK GENERATING STATION UNITS 1 AND 2 FINAL SAFETY ANALYSIS REPORT DRYWELL PRESSURE RESPONSE TO SPRAY ACTUATION FIGURE 6.219 R EV. 38,09/34 0
-,, -,.... - - -, - - - - -,, - -. ~, - - - - -.. - - - - -..., -.. - - - -
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LIMERICK GENERATING STATION UNITS 1 AND 2 FINAL SAFETY ANALYSIS REPORT I
DRYWELL TEMPERATURE RESPONSE TO SPRAY ACTUATION FIGURE 6.2 20
... - ~...,., _. - - _ -. -. -
DRAET 250.00 290.00 340.00
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w 190.00 E
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180.00 g
W I
y 140.00 d
120.00 EO 100.00 l
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3 DRYWEl.L TEMPERATURE = 49.67 'F MIN 00.00
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40.00 l
N.00 O.00 3 02 30.00 90.00 90.00 120.00 150.00 100.00 210.00 240.00 270.00 300.00 TIME (SECONDS)
LIMERICK OENER ATING STATION UNITS 1 AND 2 FINAL SAFETY ANALYSir REPORT DRYWELL TEMPERATURE RESPONSE TO SPRAY ACTUATION FIGURE 6.2 20 REV. 36. 09/84
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