ML17289B021

Forwards Supplement to 920916 Response to NRC Request for Addl Info on VIPRE-01 MOD-02 Documentation EPRI NP-2511-CCM, VIPRE-01, Thermal-Hydraulic Analysis Code for Reactor Cores.

ML17289B021
Person / Time
Site:	Columbia
Issue date:	11/23/1992
From:	Yung Y WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Rosalyn Jones Office of Nuclear Reactor Regulation
References
GO2-92-256, TAC-M79498, NUDOCS 9212100008
Download: ML17289B021 (11)

Text

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ACCESSIOR NBR:9212100008 DOC.DATE: 92/11/23 NOTARIZED: NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION YUNG,Y.Y. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION JONES,R.C. , Office of Nuclear Reactor Regulation, Director (Post 870411

SUBJECT:

Forwards supplement to 920916 response to NRC request for .

addi info on VIPRE-Ol MOD-02 Documentation EPRI NP-2511-CCM, VIPRE-Ol, "Thermal-Hydraulic Analysis Code for Reactor Cores."

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WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968 ~ 3000 George Washington Way ~ Richland, Washington 99352 G02-92-256 November 23, 1992 Mr. Robert C. Jones, Chief Reactor Systems Branch Division of Systems Technology US Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

SUPPLEMENT TO RESPONSE TO VIPRE-01 MOD-02 REVIEW QUESTIONS

Reference:

Letter dated September 16, 1992, from YY Yung, VMG to RC Jones, USNRC, "Responses to Request for Additional Information on VIPRE-01 MOD-02 Documentation EPRI NP-2511-CCM, VIPRE-01: A Thermal-Hydraulic Analysis Code for Reactor Cores (TAC No. M79498)"

This letter provides the supplement to Reference 1 as was discussed during the telephone conference on November 9, 1992, with Harry Balukjian of your staff and Heidi Komoriya of International Technical Services, Inc.

Please contact me at (509) 377-4366 if there are any questions.

Sincerely, tt / ggtl$ ,

Y. Y. Yung, Chairman (PE16)

VIPRE-01 Maintenance Group

/bw CC: H. Balukjian, NRC GS Srikantiah, EPRI J. Cuta, Battelle Pacific Northwest laboratories VIPRE Maintenance Group tDocument Control-Desk;NRC RR Assa, NRC A Jh( ~> ~

9VXaibOO08 9Zaza3 pQI PDR ADOCK 05000397.

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Supplement to Response to VIPRE-01 MOD-02 Review Questions h

Previous responses to questions on the effects of VIPRE-01 results of the changes between MOD-01 and Mod-02 have been submitted (Refer to letter of 9/16/92 from YY Yung of WPPSS to RC Zones of the USNRC, reference no. G02-92-219). The response included a table showing the magnitude and direction of the differences in code results for the test case of a specific change.

The reviewers have asked for additional information on the effect of these changes on PWR transient applications, particularly in regard to the effect of changes 125 and 128, which correct errors in the thermal properties of the zircaloy fuel cladding. To address this concern, a calculation has been performed for a typical PWR transient application of the VIPRE-01 code. A number of utility applications of the code are documented in Section 10 of Volume 4 of the VIPRE-01 documentation. (Refer to EPRI-NP-2511-CCM; Volume 4 Applications.) The FSAR loss-of-flow transient for the Comanche Peak Unit 1 nuclear station, described in Sec. 10.5, was selected for this calculation. The infoxmation available in the document describing the VIPRE model for this calculation is faixly complete, but used. As a result, it does not include the radial power distribution it was necessary to assume a reasonable distribution, based on the 'typical'alues published in the Comanche Peak FSAR.

Values were selected that gave an initial MDNBR that was close to the initial value shown in Sec. 10.5. (For this calculation, the initial value of MDNBR was 1.576 for the MOD-01 results, and 1.577 for the MOD-02 results. This is consistent with the value plotted in Figure .10.5-6 on p. 10-90 of Volume 4.) However, because the xadial power distribution for the calculation in Sec. 10.5 is not, known, it is not reasonable to directly compaxe the documented results to the current calculation. It is sufficient to note that the results are of approximately the same magnitude, and show the same txends. The significant comparison is in reviewing the xesults obtained with MOD-02 and MOD-01 in the calculation presented here.

An input file was constructed for the txansient described in Section 10.5, and was xun on the current released version of VIPRE-01/MOD-02. The same input file was then run on the master version of VIPRE-Ol/MOD-01. (A listing of the input file is attached.)

The results are shown in the attached tables; Table 1 for the MOD-01 results, and Table 2 for the MOD-02 results. As can be readily seen, the two versions of the code show the same trend in the transient, and the magnitudes of the differences are essentially the same as those displayed in the BWR transient calculation presented in the previous response.

~ ~

t,

Table 1 -- Summary of Results with VIPRE-01/HOD-01: Loss-of-flow Transient in Comanche Peak Unit 1

• • • • • • • ~*** operating conditions *********** *critical location*** hot channel conditions ***rod temperatures**

• system inlet inlet average *

• axial*mass flux heat flux* peak peak *

• pressure enthalpy mass flux heat rate *

• hot hot level*(mlbm/hr- equil. (mbtu/hr-* clad centerline* time case* (psia) (btu/ibm) (mlbm/hr-ft2) (btu/sec-ft) ~mdnbr"channel rod (in.) >> ft2) quality ft2) ~ (F) (F) * (sec) *

• * * * *

• 0 *

• A * *

• k *

• 0 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

• 0 * *

• 1 2220.0 566.48 2.620 5.393 1.576 4 6 94.5 2.349 -0.063 0.442 657.6 3906.0 0.000 1 2220.0 566.48 2.541 5.393 1.537 4 6 94.5 2.262 -0.057 0.442 657.7 3906.0 0.500 1 2220.0 566.48 2.463 5.393 1.490 4 6 94.5 2.161 -0.049 0.442 657.9 3906.0 1.000 1 2231.1 566.48 2.384 5.393 1.452 4 . 6 94.5 2.067 -0.044 0.441 658.7 3906.0 1.500 1 2242.2 566.48 2.306 5.393 1.413 4 6 99.0 1 ~ 925 -0.020 0.419 659.4 3906.0 2.000 1 2279.2 566.48 2.247 5.393 1.402 4 6 99.0 1.875 -0.023 0.418 661.6 3906.0 2.500 1 2316.2 566.48 2.188 5.393 1.390 4 6 99.0 1.829 -0.026 0.417 663.7 3906.1 3.000 1 2353.2 566.48 2.129 5.393 1.376 4 6 99.0 1.781 -0.028 I 0.417 665.8 3906 ' 3.500 1 2382.8 566.48 2.070 5 '93 1.355 4 6 99 ' 1.726 -0.028 . 0.417 667.5 3906.5 4.000 1 2392 ' 566.48 2.011 5.393 1.478 4 6 94.5 1.714 -0.070 0.411 667.6 3831.5 4.500 1 2368.0 566.48 1.952 5.393 1.642 4 6 94.5 1.719 -0.086 0.381 665.7 3720.3 5.000 1 2334.9 566.48 1.893 5.393 1.851 4 6 90 ' 1.734 -0.117 0 '60 663.2 3564.7 5.500 1 2289.2 566.48 1.834 5.393 2.015 4 6 85.5 1.716 -0.133 '.343 660.0 3399.5 6.000

Table 2 -- Summary of Results with VIPRE01/MOD-02: Loss-of-flow Transient in Comanche Peak Unit 1

• • • • • • • • • • • operating conditions *********** *critical location*** hot channel conditions ***rod temperatures**

• system inlet inlet average *

• axial*mass flux heat flux* peak peak *

• pressure enthalpy mass flux heat rate *

• hot hot level*(mlbm/hr- equil. (mbtu/hr-* clad centerline* time

• case* (psia) (btu/ibm) (mlbm/hr-ft2) (btu/sec-ft) *mdnbr*channel rod (in.)

• ft2) quality ft2) * (F) (F)

• * * * * * * * * * * * * * * * * * * * * * * * * * * * *

• 0 * * * * * * * * * *

• 0 * * * * * * *

• (sec)

• 1 1

2220.0 566 2220.0

'8 566.48 2.620 2.541 5.393 5.393 1.577 1.539 4

4 6

6 94.5 94.5 2.355 2.270

-0.063

-0.057 0.442 0.442 657.6 657.7 3959.8 3959.8 0 F 000 0.500 1 2220.0 566.48 2.463 5.393 1.493 4 6 94.5 2.171 -0 '49 0.442 657.9 3959.8 1.000 1 2231.1 566.48 2.384 5.393 1.455 4 6 94.5 2.080 -0 '44 0.441 658.7 3959.8 1.500 1 2242.2 566.48 2.306 5.393 1.416 4 6 94.5 1.987 -0.038 0.441 659.5 3959.8 2.000 1 2279.2 566.48 2.247 5.393 1.406 4 6 99.0 1.893 -0.023 0'.418 661.6 3959.8 2.500 1 '316.2 566.48 2.188 5.393 1.394 4 6 99.0 1.847 -0.026 0.417 663.7 3959.9 F 000 1 2353.2 566.48 2.129 5.393 1.380 4 6 99.0 1.798 -0.029 0.417 665.9 3959.6 3.500 1 2382.8 566.48 2.070 5.393 1.359 4 6 99.0 1.744 -0.028. 0.417 667.6 3959.8 4.000 1

1 2392.7 2368.0 566 '8 566.48 2.011 1 ~ 952 5.393 5.393 1.324 1.474 4

4 6

6 99.0 94.5 1.677 1.633

-0 '20

-0.060 0.418 0.403 668.2 666.3 3960.6 3855.5 4.500 5.000 1 2334.9 566.48 1.893 5.393 1 ~ 698 4 6 90.0 1.696 -0.100 0.380 663."7 3711.3 5.500 1 2289.2 566.48 1.834 5.393 1.874 4 6 90.0 1.687 -0.106 -

0.350 660.4 3553.7 6.000

input File for MOD-01 to MOD-02 Comparison:

Typical PWR Transient Application

• /

<</ <<<<***<<*<<*<<<<*<<<<***<<<<<<<<<<<<<<<<<<******<<<<***<<****<<* /*

• / PHR transient test, comparing MOD2 with MOD1 /*

• / A<<<<*<<<<****<<*<<<<<<<<<<<<*<<<<<<*<<<<*<<<<A<<<<<<<<*<<*<<<<<<*<<<<*<</<<

<</

<<vipre.l 1,0,0

• vipre.2 Comanche Peak Unit 1: FSAR loss of floe test (VIPRE Vol. 4; sec. 10.5)

<<geom.l geom, 16, 16, 32 g Og Og 0

<<geom.2 144.0,0.0,0.5

<<geom 4 1, 0.0590, 0.6299, 0.4406g 2g 3,0.068, 0.496g 13g0 122g0 ~ 992 2, 0.1362, 1.1750, 1.1750, 3, 3,0.122, 0.496g 5,0.122,0.496, 13, 0.244,0.992 3, 0.1180, 1.2598, 0.8812, 2, 4,0.068, 0.496, 6,0.122,0.496 4, 0.0590, 0.6299, 0.4406, 1, 7,0.122, 0.496 5, 0.1362, 1.1750, 1.1750, 2, 6, 0.122, 0.496g 13,0.244g0.992 6, 0.1362, 1.1750, 1.1750, 2, 7, 0.122, 0.496g 9,0.122,0.496 7, 0.1362, 1.1750, 1.1750, 2, 8,0.122, 0.496g 10,0.122,0.496 Sg 0.0590, 0.6299g 0.4406, 1, 11,0.068, 0.496 9, 0.1180, 1.2598, 0.8812, 2, 10,0.068, 0.496g 13,0.244,0.992 10g 0 '180g 1 ~ 2598g 0 '812g 2g llg 0 122g 0 '96g 12,0.068,0.496 llg 0 '180g 1 2598g 0 '812g lg 13gO ~ 244g 0 '92 12, 0.1180, 1.2598, 0.8812, 1, 13, 0.312, 0.992 13, 3.4518, 30.6169, 28.3457, 1, 14, 1.054, 8.466 14, 38 '089, 348.0445g 310.1883, 1, 15, 3.162, 12.699 15,190.5445,1740.2225, 1550.9415, 1, 16,7.378,25.398 16, 685.9602, 6264.8010,5583.3894

• rods.l rods, 1,20, 1, 2

• rods.2 144.0g 0.0g Og 0

• rods.3

-1

• rods' 1.55

• rods' 1, 1, 1.60, 1, 1,0.125, 13,0.375 211631,2,025,13,075 3g lg 1 63g lg lg 0 ~ 25g 2g 0 ~ 25g 3g 0 ~ 25g 13g 0 ~ 25 4,1,1.59,1, 2, 0.25, 5, 0.25, 13, 0.50 5,1,1.59,1, 2, 0.25, 3g 0.25, 5, 0.25, 6, 0.25 6,1,1.63,1, 3, 0.25, 4, 0.25, 6, 0.25g 7, 0.25 7glg1 60glg 4gO ~ 125g 7g 0 ~ 25g Bg0 ~ 125 8, 1, 1.58, 1, 5, 0.25, 13, 0.75 9,1,1.58,1, 5, 0.25, 6, 0.25, 9, 0.25, 13, 0.25 10g lg 1 61g lg 6g 0 ~ 25g 7g 0 ~ 25g 9g 0 25g 10g 0 ~ 25 ll, ~

1, 1.61, 1, 7, 0.25, 8, 0.25, 10g 0 0 75

'5, ll, 0.25 12g lg 1 58g lg 9g 0 ~ 25g 13g 13g lg 1 59g lg 10g 0 ~ 25g llg 0 ~ 25g 12g 0 ~ 25g 13g 0 ~ 25 14, 1, 1.57, 15g lg 1 54g 1,

lg ll, 12g 0.25, 13, 0.75 0 25g 13g 0 75

~

16, 1, 1.53, 1, 12, 0.25, 13, 0.75 17,2g 1.53g 1, 13, 18.0 18,2,0.99, 1, 14,264.0 19, 2, 1.08, 1, 15g 1320.0 20,2,0.97,1, 16,4752.0 0

<<rods.62

, ig nuclg 0.374g 0.3225g 9,0.0,0.0225

<<rods.63 Og Og Og Og Og 900 ~ Og 0 ~ 95g 0 ~ 0

1 4'fl lg

,l I

II 1

• rods.62 2gdnmygO ~ 374 corr, 1, 1,0

• corr.2 levy, homo, homo, none

• corr.6 ditb,thsp,thsp,w-31,cond,g5.7

~corr.9 w-31 icorr.ll 0.038,0.046,0.86 mixx,0,0, 1

• mixx.2 0.8,0.038,0.0

• mixx.3 0.0380,0.0, 7

• beta for gap li (connecting channels 1 and 3) 0.0253,0.0, 7

• beta for gap 2g (connecting channels 1 and 13) 0.0380, 0.0, 2 ~ beta for gap 3, (connecting channels 2 and 3) 0.0380,0.0

• beta for gap 4, (connecting channels 2 and 5) 0.0253,0.0, 2

• beta for gap 5g (connecting channels 2 and 13) 0.0380,0.0, 2

• beta for gap 6g (connecting channels 3 and 4) 0.0380,0.0, 7

• beta for gap 7, (connecting channels 3 and 6) 0.0380,0.0

• beta for gap Bg (connecting channels 4 and 7) 0.0380,0.0, 7 ~ beta for gap 9i (connecting channels 5 and 6) 0.0168,0.0, 7

• beta for gap 10i (connecting channels 5 and 13) 0.0380,0.0, 7

• beta for gap lip (connecting channels 6 and 7) 0.0380,0.0

• beta for gap 12, (connecting channels 6 and 9) 0.0380,0.0, 2 ~ beta for gap 13, (connecting channels 7 and 8) 0.0380,0.0, 7

• beta for gap 14$ (connecting channels 7 and 10) 0.0380,0.0, 7

• beta for gap 15$ (connecting channels 8 and 11) 0.0380,0.0

• beta for gap 16, (conneoting channels 9 and 10) 0.0215,0.0, 7

• beta for gap 17i (connecting channels 9 and 13) 0.0380,0.0, 7

• beta for gap 18, (connecting channels 10 and ll) 0.0380,0.0, 7

• beta for gap 19, (conneoting channels 10 and 12) 0.0215,0,0

• beta for gap 20, (connecting channels 11 and 13) 0.0190,0.0, 7

• beta for gap 21f (connecting channels 12 and 13) 0.0022,0.0, 7

• beta for gap 22/ (connecting channels 13 and 14) 0.0015, 0.0, 7 ~ beta for gap 23, (connecting channels 14 and 15) 0.0007,0.0

• beta for gap 24, (connecting channels 15 and 16) drag,1,1,4

• drag.2 0.0155, 0.0, 0.0, 64 .0,-1.0,0.0

• drag+7 0.374,0.496

• drag.8 2 ~ 66' ~ 20' ~ Og 0 ~ Oi 0 ~ Oi 0 5 grid, 0, 2

• grid.2 1.12,0.80

• grid.4

-1,7

• grid.6 0~ 75'i 21 ~ 35 ~ lg 42 ~ 35'i 62 ~ 45 , 1, 83.05, 1 103.55, 1, 124.15, 1 0

oper, 1,2,0, 1

~oper.2 0.0,0.0,2.6,0.0

• oper.5 2220.0, 565.1,2.62, 68.28,0 0 ~

• 2220 ',565.1,2.62, 0.00,0.0

• oper.l6

• 0,0,0,0

• oper.l3 "- system pressure forcing function 0 ~ Og 1 OOJ 1 0~ 1 00~ 2 ~ Og 1 01~ 3 ~ 8~ 1 07 4 ~ 4J 1 OBJ 5 ~ 3g 1 06' Og 0 ~ 99' ~ 5g 0 ~ 98 9.5,0.97, 13.0,0.96, 16.5,0.94, 30.0,0.93

~oper.l5 -- inlet flow forcing function 0 ~ 0~ 1 00 ~ 2 ~ Og 0 ~ 88~ 6 ~ Og 0 ~ 70' ~ Sg 0 ~ 58 15.5,0.43, 25.0,0.33, 30.0,0.30

• oper.16 -- power forcing function 0.0, 1.00, 4 .5, 1.00, 3.8, 0.81, 5.5, 0.18 5.5, 0 '6, 15.0, 0.07, 30.0, 0 '3 cont

• cont.2 6.0, 12, 20,50, 3,2 Og 0 ~

• cont.3 0.0 *default all convergence criteria

• cont.6 5, 13, 0, 14 ~ 13, 0, 1, 1, 0, 0, 0, 1, 1, 0

• cont.7 5000.0

• cont.8 -- channels to be printed 1 J 2 ~ 3 ~ 4g 5g 6g 7g Bg 9g 10~ 1 1 ~ 12 ~ 13

• cont.10 -- rods to be printed lg 2 3 4g 5J 6/ 7g Bg 9~ 10 llg 12'3'4

~cont.ll -- CHF channels to be printed

~ ~ ~

l~ 2g 3~ 4~ 5g 6g 7g Bg 9g 10'lg 12~ 13 endd 0