ML20129F097
| ML20129F097 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 07/31/1985 |
| From: | GULF STATES UTILITIES CO. |
| To: | |
| Shared Package | |
| ML20129F093 | List: |
| References | |
| NUDOCS 8507170224 | |
| Download: ML20129F097 (41) | |
Text
.s REVISED DRYWELL BREAK BASE CASE ANALYSIS July, 1985 GUIE STATES ITfILITIES CWPANY RIVER BEND STATION - UNIT 1 i
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INTRODUCTION Two base case analyses performed to determine the River Bend Station (RBS) contaiment pressure and tmperature response to hydrogen release and subsequent deflagration burning have been previously subnitted to the NRC (Ref. 1) . Wese base cases were the stuck open relief valve case (SORV) and the drywell break case (DWB) . As requested by the NBC ,
Staff during the June 13, 1985 meeting with Gulf States Utilities (GSU),
a revised DWB base case analysis to evaluate the effect of reducing the steam flow, revising the drywell/ ADS sparger flow split, modifying the radiant heat transfer beam length, and reducing the drywell bypass leakage for -the drywell break base case has been cmpleted. In addition, GSU is providing additional justification for the tenperature of hydrogen released. With the exception of these parametric variations, all other CLASIX-3 input was unchanged except as noted herein.
STEAM FIDW The effect of using a reduced steam flow for the DWB base case has been evaluated. The previous DWB base case utilized an initial blowdown release rate and flow split between the drywell break and the wetwell as calculated by the MAAP computer code. This was followed by a non-mechanistic release rate which was continued until a 75% metal-water reaction was achieved. We non-mechanistic hydrogen release rate used was 0.1 lbn/sec and is consistent with the release rates developed by the Hydrogen Control Owners Group (HCOG) (Ref. 2) .
The non-mechanistic model developed by the HCOG was based on assuring that the severely damaged core remained coolable and was empletely quenched (i.e., all excess stored energy rmoved) at the end of the transient. Based on this model, the maximum heat which could be rmoved frm the severely deformed core is 51 Mw, considering heat loses frm the top, bottm and sides of the deformed core. The previous DWB analysis assumed that this heat was rmoved by producing steam at the existing RPV pressure. For this analysis, it was assumed that a portion of this steam is used in producing hydrogen. Based on the HOOG non-mechanistic model, the steam produced while removing the core decay heat and excess stored energy is equivalent to 44.2 Mw. Therefore, the steam flow associated with hydrogen production is 6.8 Mw. For this analysis approximately twice as much steam was assumed to be consumed by hydrogen production. The steam flow used in this analysis was conservatively assumed to be equivalent to 36.3 Mw. The steam tmperature used in this analysis is the same as in the previous analysis and corresponds to the RPV pressure for this condition. Steam release rates are given in Tabic 1.
Page 1
N FIN SPLIT The effect of revising the flow split between the drywell break and the ADS valves has also been evaluated. Based on a recent MAAP analysis performed under the auspices of HOOG, the flow spl'it was determined to be a function of the total stem flow. his relationship is illustrated in Figure 1. For the revised analysis, flow split during the initial blowdown and the period of high hydrogen release was the same as the previous analysis and was obtained fr m a MAAP analysis. Following this, a flow split based on Figure 1 and the assumed steam flow was used. This flow split (85% to ADS spargers) was then used for the duration of the hydrogen / steam release.
BFAM LENGTH
%e NBC Staff suggested that the magnitude of the beam length used in radiant heat transfer be varied fr m that of our previous analysis.
h is concern has previously been addressed by Mississippi Power and Light (MP&L) (Ref. 3). MP&L performed a drywell sensitivity study in which the beam length was reduced frm 48.67 feet in the drywell to 20 feet. We only significant effect of this major reduction in beam length was a slight increase (approximately 13%) in the drywell peak pressure created by the burn. Based on the MP&L study, it can be concluded that minor variations in beam length will have an insignificant effect on results.
Even though the magnitude of the beam length has been shown to have little effect on the overall results, GSU has modified the beam lengths used in our analysis. The beam lengths used in the revised DWB base case analysis are based on the Chmical Engineers' Handbook (Ref. 4) and were calculated frm BL = 3.5 V/A Where: BL = Beam Iength V = Cmpartment Volume A = Area of Cortpartment he revised values used for beam length are given in Table 2.
DRYWELL BYPASS LEAKAGE
%e magnitude of drywell bypass leakage used in our previous DWB base case has also been revised. We drywell bypass leakage used previously was 10% of the 2 allowable bypass leakage which is equivalent to an A/ K of 0.115 ft . For the present analysis, the tested drywell bypass leakage has been2 used. The measured bypass leakage is equivalent to an A/ K of 0.014 ft Page 2
r l
HYDROGEN TD@ERAWRE t-I 'Ihe NRC Staff requested that additional justification for the assmed hydrogen tmperature be provided. A definitive assessment of the hyde tmperature has not been performed; however, certain l qualitative justification can be made for the ternperature used in the RBS analysis. First, the relative quantity of steam and hydrogen produced during the constant release portion of the transient will tend to reduce the inpact of assuning that the hydrogen and steam are at the l same taperature. For this analysis the mass flow rate for steam l
exceeds the hydrogen mass flow by a ratio of approximately 363 to 1.
Secondly, during this portion of the transient, the RPV must be flooded above the degraded core. Therefore, while the hydrogen and steam are passing through this pool they will reach equilibrium. In addition, the hydrogen and steam will be thoroughly mixed while passing through the steam separator and steam dryer. Since the steam tm perature for this portion of the transient was based on the prevailing RPV pressure, the same tmperature (saturation tmperature) was used for the hydrogen.
OmER INPtTP For the revised analysis, drawdown of the suppression pool was assumed to occur at 2300 sec. into the transient which is consistent with the MAAP analysis. '1he Quantity of water r e oved was equal to 4,526 cubic' feet and was rmoved at a rate of 5000 gpn. In addition, the contalment flow areas were reviewed and verified as correct as given in the previous DWB base case.
RESULTS & CONCLLEIONS The results for the revised DWB base case are given in Table 3. A cxmplete set of plots of results for the revised DWB base case are given in Figures 2-29.
During the period of hydrogen release, the peak taperatures and pressures in all volmes were reduced. When the analysis was extended past the end of hydrogen release, the drywell tmperature was less than the previous analysis while the tmperatures in the other volumes increased slightly. The pressures resulting fr m the final forced burn were reduced significantly.
Although no dramatic changes were observed in the results, the most inportant change appears to be due to the reduction in the bypass leak rate. With the lower leak rate, the slow increase in base tmperature has been decreased or essentially eliminated. Also, because of the reduced partial pressure of the water vapor, the conditions for ignition were reached with fewer pounds of hydrogen so that the peak pressures l
Page 3 l
g w I and temperatures were rdM and the amount of hydrogen remaining at the end of hy&w> release was also reduced. The relative magnitude of the forced burn, after the ocupletion of hyavgen release, was a little more severe Wanaa of the absence of the steau, i
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r-REFEREN3S
- 1. RBG-21,218 dated June 7,1985 fran GSU (J.E. Booker) to NBC (H.R.
Denton)
- 2. IG-034 dated May 17, 1985 fran HOOG (S.H. Hobbs) to NRC (Robert Bernero)
- 3. AB N-83/0479 dated August 23, 1983 fran MP&L (L.F. Dale) to NRC (H.R.
Denton)
- 4. Perry, R. H. and Chilton, C. H., Chanical Engineer' Handbook, 5th Edition, 1973 p. 10-56.
! Pago 5 4
E TABLE 1 River Bend CIASIX-3 Input Revised DWB Base Case Stean Release to the Suppression Pool Sheet 1 of 4 TIME FLOW RATE FNEIGY RATE (SECONDS) (LB/SEC) (BW/SEC)
O. 294.81 3.508E5 0.43 622.5 7.433E5 4.84 3457.44 4.124E6 9.72 3058.33 3.655E6 12.2 279.15 3.349ES 28.05 262.84 3.139ES 30.88 0. 1.0 1059. O. 1.0 1096, 952.56 1.149E6 1169. 461.07 5.584E5 1223. 318.84 3.857E5 1295. 226.89 2.741ES 1405. 150.34 1.819ES 1608. 79.49 9.890E4 1798. 26.02 3.198E4 2007. 0.5 5.830E2 2032. O. 10.
2386. O. 10.
2422. 75.26 1.089E5 2477. 108.55 1.683E5 2531. 156.05 2.513E5 2549. 154.5 2.768E5 2567. 255.13 3.257E5 2604. 179.2 2.337E5 2762. 2.75 3.573E3 2819. O. 10.
3644.999 0. 1.
3645. 30.855 39918.
21569. 30.855 39918.
21569.001 0. 1.
Page 6
TABLE 1 River Bend CLASIX-3 Input Revised DWB Base Case l
Steam Release to the Drywell l
t Sheet 2 of 4 TIME FIN RATE ENEIE PATE l
! (SB00NDS) (IR/SEC) (MU/SEC)
- 0. 259.53 3.088E5 0.43 273.86 3.270E5
! 20.78 234.39 2.794E5 78.77 228.88 2.753E5 150.1 227.78 2.751ES 321.4 200.99 2.418E5
! 518.1 180.02 2.170E5 l 702.1 168.93 2.042E5 l
1059, 142.35 1.723E5 1096. 104.78 1.263E5
! 1187. 44.83 5.435E4 l 1295. 24.96 3.015E4 L 1405. 16.54 2.001E4 ,
! 1534. 11.02 1.362E4 :
1798. 5.65 6.942E3 l
l 2032. 6.93 8.094E3 -
2366. 4.86 5.781E3 l l
l 2404, 6.79 9.467E3 2567. 24.76 3.582E4 2659. 11.01 1.431E4 2672. 5.74 8.473E3 l 2992. 0.74 9.570E2 i
3649.999 0.0 3.000E1 3645. 5.445 6.339E3 21569. 5.445 6.339E3 21569.001 0.0 1.
T Page 7 P
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TABLE 1
River Een3 dASIX-3 Input Revisaf DNB Base Case l f e y&w Releases to the Drywell n.; ;
' 's _
- Sheet 3 of 4
~
TIME FION RATE TEMPERATURE (SECONDS) (IB/SEC) -^ (F) r -
1295. 0.00 '
364.6
.1971.
~
6.E-4 . m 346.4 2032. 1.FM + # 254.8 2386. ,_
.0525 - ,
, 288.44 2404. .16 7 722.2
^ 2422. .098 830.6 2440. ~.104 ,- 873.6 2458.' .215 976.8 e 2477. . .323 1032.2
,, ~. 2495. .264 1130.8 2513. ~ ' - .138 1327.6 2531.
.076 1149.0 2549. . '
.012 1480.4 '
2567. .'.004 835.6 2819. j f 0.000 503.9 3644.999 - 0.0 '
250.34 3645. f , ' O 015. " - ~
250.34 21569. 0.015 250.34 21569.001 i 0.0 250.34
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TABLE 1
! River Bend CIASIX-3 Input I
-Revised DNB Base Case t
Hydrogen Flow to the Suppression Pool I-i-
l Sheet 4 of 4 TIME FLOW PATE TEMPERAHIRE (SECONDS) (LB/SEC) (F) 1295. 0.0 364.6 1853. .0012 372.7 2032. 0.0 243.6 2386. 0.0 288.4 2404. 1.224 722.2 2422. .877 830.6
-2440. .969 873.6 2458. 1.954 976.8 2477. 3.012 1032.2 2495. 2.397 1130.8 2513. 1.221 1327.6 2531. .6948 1149.0 2549. .011 1480.4 2819. 0.0 503.9 3644.999 0.0 250.34 3645. 0.085 250.34 21569. 0.085 250.34 21569.001 0.0 250.34 1
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Page 9
TABLE 2 Radiant Heat Transfer Beam Iength amaneur Bsmroom Drywell 11.5 ft.
Wetwell 21.6 ft.
Intermodiate Volume 4.8 ft.
Upper Containment 27.4 ft.
1 Page 10
TABLE 3 Stamary of CIASIX-3 Results RBS Drywell Break DWB BASE CASE REVISED DWB Nunber Burns DW 0 (0) 0 (0)
W 28 (1) 35 (1)
IN O (1) 0 (1)
Cr 0 (1) 0 (1)
Total Burned DW 0 (0) 0 (0)
(lb) W 1416 (1466) 1504 (1569)
IN O (175) 0 (156)
CT 0 (339) 0 (292)
H2 Remaining DW 33 (31) 36 (36)
(Ib) W 73 (9) 68 (.4)
IN 178 (24) 157 (1)
CT 355 (10) 290 (1)
Peak Tenp. DW 388 (341) 374 (338)
(F) W 1893 (1137) 1863 (1358)
IN 640 (1039) 416 (1125)
CT 202 (1154) 165 (1190)
Peak Press. DW 19.3 (32.3) 12.0 (22.4)
(psig) W 20.3 (45.3) 12.7 (34.7)
IN 17.3 (44.3) 10.5 (34.7)
CT 16.3 (45.3) 10.0 (34.6)
( ) - Values due to extension of transient past end of hy&wai release. These values result frun a hy&upui burn which was forced to occur in mitiple contaiment volinnes simultaneously.
Page 11 l-
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, Tigure 1 MAAP FLOW SPLIT ADS STEAM FLOW / TOTAL STEAM FLOW O.9 - ,
fn 0,8 -
Y 0.7 -
0.8 -
e 0.5 -
E 5 0.4 -
a y 0.s -
n .
3 0.2 -
0.1 -
O , , , , ,
O 20 40 60 TOTAL STEAM FLOW (KG/SEC) e
Figure 2 o
GSU/ RIVER BEND DWB 6/85 DRYWELL TEMPERATURE 380 360 -
340 -
320 -
300 -
fs 260 -
- 2. -
it' 3 220 -
200 -
180 -
.1 60 -
140 -
120 , , , , , , , , , ,
O 4 8 12 16 20 TIME ( 1000 SECONDS }
1 1
Tigure 3
. 1 GSU/ RIVER BEND DWB 6/85 WETWELL TEMPERATURE 2
1.9 -
1.8 -
1.7 -
1.6 -
1.5 -
1.4 -
@ 1.3 -
wo 1.2 -
$E 1.1 -
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0 4 g 32 16 20 TIME ( 1000 SECONDS }
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. Figure 4 GSU/ RIVER BEND DWB 6/85 INTERMEDIATE VOLUME 1EMPERATURE 1.2 1.1 -
1-0.9 -
p 0.8 -
0.7 - .
0.6 -
0.5 -
H 0.4 -
0.3 -
L s d 0 4 8 12 16 20 TIME ( 1000 SECONDS }
4
. Figure 5 GSU/ RIVER BEND DWB 6/85 CONTAlHMENT. VOLUME TEMPERATURE 1.2 1.1 -
1-0.9 -
p W
0.8 -
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yy 0.7 -
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+ Figure 6 GSU/ RIVER BEND DWB 6/85
. DRYWELL PRESSURE 40 35 -
30 -
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0 4 8 12 16. 20 T1ME ( 1000 SECONDS }
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Figure 7 GSU/ RIVER BEND DWB 6/85
. WETWELL PRESSURE 50 -
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Figure 8 GSU/ RIVER BEND DWB 6/85 '
INTERMEDIATE VOLUME PRESSURE 50 -
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0 4 8 12 16 20 TIME ( 1000 SECONDS }
- . . _. . . . - - _ =.
4 Figure 9 GSU/ RIVER BEND DWB 6/85 CONTAlHENT VOLUME PRESSURE 60 50 -
40 -
m b
g 30 -
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0 4 8 12 16 20 TIME { 1000 SECONDS }
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. Figure 10 GSU/ RIVER BEND DWB 6/85 DRYWELL - WETWELL DP 5
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3- Ifl l IP'i[IfYIP I l I !
2-9- 1-rn 0
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ME (SECOHOS )
Figure 11 GSU/ RIVER BEND DWB 6/85 5
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Figure 12 GSU/ RIVER BEND DWB 6/85 WETWELL - INTERMEDIATE DP 4-w 3-ce 3
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, Figure 13 GSU/ RIVER BEND DWB 6/85 INTERMEDIATE - CONTAlHWEHT DP 1.7 1.6 -
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TI(ME (SECONDS)
. Figure 14 GSU/ RIVER BEND DWB 6/85 0.21 0.2 -
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. Figure 15 GSU/ RIVER BEND DWB 6/85 WETWELL 02 VOLUME FRACTION O.2 -
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o Figure 16 GSU/ RIVER BEND DWB 6/85 INTERMEDIATE VOLUME O2 VOLUME FRACTI N O.21 0.2 -
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4 Figure 17 GSU/ RIVER BEND DWB 6/85 CONTAINWENT VOLUME O2 VOLUME FRACTION O.21 0.2 -
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.. Figure 18 GSU/ RIVER BEND DWB DRYWELL H2 VOLUME FRACTION 6/85 O.8 0.7 -
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a E O.4 -
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,_ Figure 19 GSU/ RIVER BEND DWB 6/85
- WETWELL H2 VOLUME FRACTION O.8 0.7 -
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. Figure 20 GSU/ RIVER BEND DWB 6/85 INTERWE01 ATE VOLUWE N2 VOLUWE FRACTION O.8
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6- Figure 21 GSU/ RIVER BEND DWB 6/85
. CONTAlHWiper VOLUME N2 VOLUWE FRACTION O.7 -
0.6 -
0.5 -
v -
E O.4 -
Y 0.3 -
O.2 -
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O 4 8 12 16 20-TlWE ( 1000 SECONOS }
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. Figure 22 GSU/ RIVER BEND DWB 6/85
- DRYWELL H2 VOLUME FRACTiOH 0.2 0.19 -
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6 'O.13 -
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i s Figure 23 GSU/ RIVER BEND DWB 6/85 WETWELL H2 VOLUME FRACTION O.10 -
0.18 -
0.17 -
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g' rigure 24 GSU/ RIVER BEND DWB 6/85 INTERMEDIATE VOLUME H2 VOLUWE FRACTION 0.2 0.19 -
0.18 -
0.17 -
0.16 -
0.15 -
0.14 -
6 0.13 -
P O.12 -
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$ O.09 -
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f .' ., ', .,,.
a g -s Figure' 25-
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GSU/ RIVER BEND DWB 6/85 CONTAlHWENT VOLUME H2 VOLUME FRACTION 0.2 "~ '
0.19 -
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0.17 - ,
4- 0.16 - ,
~*"
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o Figure 26 GSU/RIV'ER BEND DWB 5/85 DRYWELL H2O VOLUME FRACTICH 1
O.9 -
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k O.5 -
Y 3 0.4 -
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O 4 8 12 16 20 TIME ( 1000 SECONDS }
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4 Figure 27 GSU/ RIVER BEND DWB 6/85 WETWELL H2O VOLUME FRACTION ,
0.2 I 0.19 -
0.18 -
0.17 -
0.16 - I O.15 -
0.14 -
5 0.13 - i 0.12 - (
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b- Figure 28 GSU/ RIVER BEND DWB 6/85 INTERMEDIATE VOLUME H2O VOLUME FRACTI'ON 0.2 0.19 -
0.18 -
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0.15 - r O.14 -
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' Figure 29 l 1
GSU/ RIVER BEND DWB 6/85 CONTAINMENT VOLUME H2O VOLUME FRACT10N O.19 -
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