ML13310B275
| ML13310B275 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/09/1984 |
| From: | Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13310B273 | List: |
| References | |
| TAC-06836 DC-1562, NUDOCS 8403050143 | |
| Download: ML13310B275 (22) | |
Text
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- he deter-4.2 ALGORITHMS USED FOR SETPOINT/OVERSHOOT DETERMINATION
- ion of
-tpoint,
'4.2.1 Setpoint Determination for Mass Input Transient but in its. In-Determination of a relief valve sztpoint which will not result in loped for a peak pressure in excess of the Appendix G limit, for the case of ference mass input as applied to a specific operating plant, is accom
- ation plshed with a procedure based on the following simplified ameters; interpolating equation:
and mass juation A~P (V S. Z' X) - AP REF ( x)
- FV* F S
- F (1
The procedure for determining the relief valve setpoint is des cribed below. To illustrate the application of the procedure, a set of sample input parameters will be considered, and the results of the sequential application of each step of the procedure to these parameters will be noted.
PARAMETERS FOR MASS INPUT EXAMPLE Relief Valve Setpoint 500 psig Relief Valve Opening Time = 2.0 seconds Mass Input Rate
-160 lb/sec RCS Volume
= 10,000 cu.ft.
Applying the pnass input procedure:
4-3
.*A
-AA."
t
~
s-P247 Procedure Example Application Select relief valve setpoint Setpoint 500 psig operating range 2
For limiting mass input rate, APREF 82 psi for mass input obtain AP F from Figure rate (x) 60 lb/sec REF 4.2.1 3
For total RCS volume, obtain FV 0
for total RCS volune factor from Figure 4.2.2 (V)
- 10,000 cu.ft.
V F =0.733 for relief valve 4
For the relief valve opening z
.7 f r e a time (total, including delay),
opening time Z = 2.0 seconds obtain F factor from Figure 4.2.3 nt 1.14 for relief valve 5
For the relief valve setpoint f
selected, obtain F5 factor setpoint
- 500 psig from Figure 4.2.4 6
Calculate the product of fac-AP (10,000 cu.ft., 500 psig, tors ap REFI FV FS, and Fz 2 seconds, 60 lb/sec) u 49 determined in Steps 2 through psit 5 (application of Equation 1).
This is the setpoint overshoot, ap.
t Conservative - LOFTRAN analysis for these conditions gives an overshoot equal to 25 psi.
4-4
FIGURE 4.2.1 ation ss input L~i1
~
~
7TZ
- S volume valve-seconds ialve
- psig, U49 T
I
,Ma ss Input Rate I lb/sec
- 7. -
44 T
mass Input FGR
-~~F
~
RCS Volmwe Factor C'4 77n 7
4-6
- opening Time Fat
]-e 1-i-Ea
-4 1=4 T
~
9 6
z
~
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-=T I
I
-r
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-~
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T~- I__
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TT I_____
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P.t 6 /
Ci L.
t-77-il FIGURE 4.2.1
-7 77
-=J.
~Mass InutL-:7 Fs-Relief Val ve Setpolnt Factor 1M.
7 7:
-~--7 X0 J
S-*~.
S1 Relilef Valve Setpoint -
pslg 4-8
~
x~ur /~r(6 g
k
--1J4.
.P S
tep Procedure Example Application 7
Add P (Step 6) to the relief 515 psia (relief valve valve setpoint (Step 1) to setpoint) plus 49 psi., or 564 obtain maximum transient pres-psia. From Figure 4.2.5 at RCS sure, P I
temperature *1006F, Appendix G sue MAX*
MfPAX<
Appendix G limitation, se-pressure limit 540 psig + 15, lected relief valve setpoint or 555 psia. Thus, is acceptable. If PMAXAppendix G limitation.
Appendix G limitation, go to Step 8.
8 if P Appendix G limita-Reducing setpoint by 10 psi tion, selected relief valve i to setpoint is too high. Reduce psig and repeating Steps 2 setpoint and repeat Steps 5 through 6 results in Ap p 49.4 through 7 until an acceptable psi and
- 505 psia +
osetpoint is determined.
49.4 554.4 psia. Since 554.5 psia < Appendix G limit, 490 psig is an acceptable setpoint.
4-9 psi an7MX-0 pi
2400 2300 T
IT 20 MATERIAL PROPERTY SIS A A LOCATION CONTROLLIN MATERIALW IOWERSEEELL COPPER CONTENTo.4WT %
2100 imosmmonuscouTrENT'0.014 RTNOT INITIAL' 56F 4tN DAFTER I69FPV' 3I?*F 1800 L
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CTRmIAL PPTy bOS MATUP IAT N
CONTOLLINGMTRA LOWER SHELL-COPPER CONTENTO.I4WT%
PHOSPORUS CONTENT 10-0 wT%
6 TN00 INITIAL 120' 500 I
I I
w CVE APPLICABLE FOR HEATUP YATES Up To G0'/HRt FoR THE SERVICE PERIOD
- u UP TOM EP AND CONTAINS MARGIN9 Op a.F AND so pSIA SR POSSIELE INSTRUMNYDT ERRO "a
000-u -
o -
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-r soo 1400
£ 300 5200-080 1100 -
__CRITICALITY LIMIT 00BASED ON NSERVICE HYDROSTATIC TEST 100 700 TEMPERATURE (oF)
EFEC-V DA 4/8
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1-RVISD 6//8 600 20 500
~
60 FIGURE 3.1.30 San 0nof rq Urit No. I Reactor Coolanlt 200~~ S sm IMeotvWP L Imt~tIOAAS 400abIs..-
200for twFin t 6G EPPY.
0-o
=to.0 0
600 0100 200 300 400F)0 INDICATED TEMPERATURE(F EFFECTIVE DATE 4/I8/80 3-?
REVISED 6/i/SO
2500 24004
- 2500 apmG COMT RIA WT%
2400 gcHsPORS ON0 4 WT%
-L-RTND aITIAL*SSF AFTgR 06 ZPPY-1/4T.217P 20 CURVE APPLIASLE FO 00COLDOa RATS UP TO 1009/ PR FOITC SIERVICE PERIoQ UP TO is FrY AND CONTAINS MARGINS ORt
- F AND 2200 GDPSIS P0 POSSISLE INSTRUsENT RRQRS.
2100 2000 1800 1700 60 0
1500 w
1400 I
100 1000 Z
900 700 COOLDOWN RATE oF/HR
00----------------------------- -------
500 20 200 FIGURE 3.1.3b Son Onofre Unit No.I Reactor Coolant System Cooldown Un itons Applicable for the Ft 100 iz rzzY zzii 10 200 300 400 500 600 INDICATED TEMPERATURE (OF)
EFFECTIVE DATE : 4/18/80 3-8 REVISED t 6/ I /80