MHI's Response to NRC's Request for Additional Information ... · MHI's Response to the NRC's...

Enclosure 3

UAP-HF-08186

MHI's Response to NRC's Request for Additional Information on"Design Data for TRACE and MELCOR Input Deck Development"

October 2008(Non-Proprietary)

MHI's Response to the NRC'sRequest for Additional Information on"Design Data for TRACE and MELCOR Input Deck Development" UAP-HF-08186-NP (RO)

INTRODUCTION

This report documents MHI's response to the NRC's request for additional information(RAI) on "Design Data for TRACE and MELCOR Input Deck Development" datedSeptember 8, 2008. This RAI represents the third request for additional information byEnergy Research, Inc. (ERI) for the development of a TRACE and MELCOR model of theUS-APWR. The first two requests were received from the NRC in letters dated July 9,2008 and August 12, 2008. The responses to these requests were sent in MHI lettersUAP-HF-08143-P (RO), dated August 8, 2008, and UAP-HF-08143-P (Ri), datedSeptember 8, 2008, respectively.

This document provides a complete response to all five items related to the TRACE andMELCOR Input Deck Development in the September 8, 2008 request.

Mitsubishi Heavy Industries, LTD. 1Mitsubishi Heavy Industries, LTD. 1


REQUEST-I(a)

Please provide the following data regarding the US-APWR reactor vessel and core:

a) The volume of the flow distribution device in the lower head.

RESPONSE

The volume of the flow distribution device is ft3.



REQUEST-I(b)

b) The thickness, total number of holes and the inlet and exit diameter of the holes in thelower core support plate.

RESPONSE

The dimensions of the lower core support plate are as follows:* Thickness:( )inches* Total number of holes

f (;h )x 257 assemblies) in the core regionSn)th~e neutron reflector region

* The inlet and exit diameter of the holesThe inlet and exit major diameter in the core region: ) JinchesThe inlet and exit major diameter in the neutron reflector region: ( )inches



REQUEST-I (c)

c) Diameter and/or wall thickness of the upper support column.

RESPONSE

The dimensions of the upper support column are as follows:" Upper support column

Outer diameter: jinchesInner diameter: Jinches

" Top slotted upper support colunlnLarge outer diameter:L JinchesWall thickness: I )inches

Small outer diarpeter: )inchesWall thickness:L jinches

Mitsubishi Heavy Industries, LTD. 4


REQUEST-I (d)

d) Dimensions of the instrument support tubes.

RESPONSE

The dimensions of the instrument support tubes are as follows:Outer diameter: ] JinchesTube length: [ Ii



REQUEST-I (e)

e) The thickness of the upper support plate.

RESPONSE

The thickness of the upper support plate is j )inches.



REQUEST-I (f)

f) Number of control rods in each control rod guide tube.

RESPONSE

When the rods are fully withdrawn, a single control rod guide tube houses a single rodcluster control assembly (RCCA). From Table 4.2-2 of the DCD, the number of controlrods in a single RCCA is 24. Therefore, the number of control rods in each control rodguide tube is 24.



REQUEST-I (g)

g) The relative power levels (relative to nominal power) for each assembly. Pleaseprovide the distribution in the form of a 'top view' of the core.

RESPONSE

The radial power distributions (relative to nominal power) for each assembly in the form ofa top view of the core are described in US-APWR DCD Section 4.3.2.2.1 for the initial coreand in Appendix A of the technical report "US-APWR Fuel System Design Evaluation:MUAP-07016-NP (RO)" for the typical 24-month equilibrium cycle core.

MHI shows power and burnup distributions of the above two core configurations at hot fullpower, with almost all control rods out(1), and equilibrium xenon conditions (HFP, ARO,EqXe) for the beginning, middle, and end of cycle (0.15 GWD/MTU, 11 GWD/MTU, and23 GWD/MTU). Figure 1(g)-1 shows the initial core loading pattern, and Figures 1 (g)-2through 1 (g)-4 provide the radial power distributions for each assembly for this initial coreconfiguration. These figures are excerpted from US-APWR DCD Section 4.3.2.2.1.Furthermore, Figure 1(g)-5 shows the typical 24-month equilibrium cycle core loadingpattern, and Figures 1 (g)-6 through 1 (g)-8 provide the radial power distributions for eachassembly for this 24-month core loading pattern. These figures are excerpted fromMUAP-07016-NP (RO) Appendix A.2.3.1.

(1): Control bank D withdrawn to 'bite' position.



T S R P N M L K J H G F E D C B A180°

1

2

3

4

5

6

7

8

9 90'

10

11

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17

R3 R2 R R2 R13 IR R3 1R23 R2 R3UA UA UA UA UA UA UA UA, UA

R2 1R2 1R2 1JR3 1R2 1R3 IR1 1R3 1R2 JR3 1R2 1IR2 1R2UAI UAI UC GB IGB IGB IUAI GB IGBI GB IUC UAI UA /

R2 JRi P2 JR3CR2 JRi P3 tpi1 JR3 R1 PR2 JR3 JR2 JR1 R2UA U UDj Gt GBj UAj GBj UAJ GBJ UA GBI GCj UE UAJUA

R2 PR2 IRi 1R2 JRi 1R3 JRi 1R3 CRi JR3 CRi 1R2 JRi P2 1R2UA UDI UAI UD IUAI GC IUAI GO UA GC UAI UDI UAI UDI UAR3 R2 R3 R2 R1 R2 R1 R3 R2 R3 R1 R2 R1 R2 R3 R2 R3UAI UCI GC UD UA GC UA GC GB GC UA GC UA UD GC UC UA

R2 R3 R2 R1 R2 R1 R3 R1 R3 R1 R3 R1 R2 RI R2 R3 R2UA GB GB UA GC UA GB UA GB UA GB UA GC UA GB GB UA

R2 R2 R1 R3 RI R3 R1 R3 R1 R3 R1 R3 R1 R3 R1 R2 R2UA GB UA GO UA GB UA GB UA GB UA GB UA GO UA GB UA

R3 R3 R3 R1 R3 R1 R3 R1 R2 R1 R3 R1 R3 R1 R3 R3 R3UA GB GB UA GC UA GB UA GC UA GB UA GC UA GB GB UA

R1 R1 R1 R3 R2 R3 R1 R2 R1 R2 R1 R3 R2 R3 RI R1 R1UA UA UA GO GB GB UA GC UA GC UA GB GB GO UA UA UA

R3 R3 R3 R1 R3 R1 R3 R1 R2 R1 R3 R1 R3 R1 R3 R3 R3UA GB GB UA GC UA GB UA GC UA GB UA GC UA GB GB UA

R2 R2 R1 R3 R1 R3 R1 R3 R1 R3 R1 R3 R1 R3 R1 R2 R2UA GB UA GO UA GB UA GB UA GB UA GB UA GO UA GB UA

R2 R3 R2 R1 R2 RI R3 R1 R3 R1 R3 R1 R2 R1 R2 R3 R2UA GB GB UA GC UA GB UA GB UA GB UA GC UA GB GB UA

R3 R2 R3 R2 R1 R2 R1 R3 R2 R3 R1 R2 R1 R2 R3 R2 R3UA UO GO UD UA GC UA GC GB GC UA GC UA UD GO UO UA

- 270'

R2 PR2 IRi 1R2 IR1 JR3CIP1 R JRi 1R3CIRi 1R2 IRi 1 R2 JR2UA UD IUAI UD IUA IGO UA IGOC UAI GO UA IUD IUA IUD UA

R2 R1 R2 IR3 PI2 Ri =R3 iRi JR3 jR1 R2 R3CR2 R1 R2UIUAI UDIGO GBt UAI GB _UAJGBj UA GBj Gj UD] UA UA

R2 PR2 1R2 1R3 JR2 JR3 JRi 1R3 1R2 1R3 1R2 1IR2 1R2UAI UAI UOI GB GB GB IUAI GB IGB IGB IUO UAI UAN

R3 R2 jR2 R3 IR1 IR3 R2 R2 R3UA UA UA UA UA UA UA UA UA

. . . Region name

Region Number Uranium rods/FA Gadolinia rods/FA _ BP rods/FA

Number U-Enrich. Number U-Enrich. Gd-Content Abs.Length Number Abs.LengthR1UA 81 264 2.05 wt% -

R2UA 32 264 3.55 wt% - -

R2UC 8 264 3.55 wt% - 20 159.4inR2UD 16 264 3.55 wt% - 24 159.4inR2GB 20 240 3.55 wt% 24 1.95 wt% 10wt% 159.4in -

R2GC 12 240 3.55 wt% 24 1.95 wt% 6 wt% 159.4inR3UA 16 264 4.15 wt% - -

R3GB 44 240 4.15 wt% 24 2.55 wt% lOwt% 159.4inR3GC 28 240 4.15 wt% 24 2.55wt% 6 wt% 159.4in

Abs. length: the upper approximately 5.9in of the absorber rod does not contain absorber material

Figure 1(g)-1 Initial Core Fuel Loading Pattern (Source: DCD Figure 4.3-2)



J H G F E D C B A

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10

11

12

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16

17

IR1UA

0.870.1

N

R2GC0.950.1

R1UA0.91

0.1

RI UA0.91

0.1

R3GB1.070.2

RIUA0.950.1

R3GB1.040.2

RIUA0.95

0.1

R3GB1.100.2

RIUA0.960.1

R2GB0.92

0.1

R3GC1.10

0.2

RIUA0.97

0.1

R2GC1.030.2

R1 UA0.99

0.1

R3GC1.100.2

R1UA0.97

0.1

R3GC1.130.2

RIUA0.960.1

R2UD1.070.2

R 1UA1.04

0.2N

R1UA R3GB RIUA R2GB R3GC R2UD iR1UA0.98 1.07 0.93 0.94 1.09 1.09 0.97

0.1 0.2 0.1 0.1 0.2 0.2 01

R1UA R3GB R2GB R3GB R2UC R2UA R2U0.98 1.04 0.93 1.01 101 1.10 0.83

0.1 [ 0.2 01 02 02 0.2 0.1

R1UA0.75

0.1

R3UA1.070.2

R2UA1.010.2

R2UA0.98

0.2

R3UA0.87

0.1

. . . Region

. . . Assembly relative power

. . . Assembly burnup(GWD/MTU)

= = = ________

(HFP, EqXe, ARO (1)

Figure 1 (g)-2 Normalized Radial Power and Burnup Distributions at 0.15 GWD/MTUfor the First Cycle Core (Source: DCD Figure 4.3-6)

Note: (1) Control Bank D withdrawn to 'bite' position



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17

J

RI UA1.0311.1

R2GC1.2212.6

H G F E D C B A

'R1UA1.0110.9

I-- 6z

R1UA1.0110.8

K3GB1.2312.9

R1UA1.0011.0

R3GB1.2913.0

KlUA1.0511.2

R3GB1.2513.3

R1UA1.0111.3

R2GB1.2812.3

R3KC1.3914.2

RIUA1.0511.6

R2G(1.2213.2

RlUA0.9911.4

IR3GC

1.3613.8

RI UA1.0611.4

R3GC1.3113.9

R1UA1.0011.2

R2UD1.1112.3

'R1UA0.9210.9

R1UA R3GB R1UA R2GB R3GC R2UD R1UA0.94 1.13 0.94 1.08 1.20 0.97 0.7010.4 12.0 10.2 11.1 127 11.3 8.9

R1UA R3GB R2GB R3GB R2UC R2UA R2UA0.81 0.96 0.93 0.99 0.93 0.79 0.54

9.3 10.5 9.8 10.6 10.4 10.0 7.2

N

I'lUA0.556.6

KRiUA0.75

9.2

X2UA0.73

8.8

K2UA0.72

8.7

K6UA0.637.8

. . . Region



(HFP, EqXe, ARO(1))

Figure 1 (g)-3 Normalized Radial Power and Burnup Distributions at 11 GWD/MTUfor the First Cycle Core (Source: DCD Figure 4.3-7)




J .H G F E D C B A

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10

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17

IR1UA

0.9022.1

N

R2GC1.0525.9

R1UA

0.9222.1

]RI UA

0.9322.2

R3GB1.1527.2

R1UA0.9422.4

\

R3GB1.1827.9

RIUA0.9422.9

R3GB1.1427.6

'R1UA0.9122.4

IL _____________ .IL _____________ .11 ______________ ______________Ir .... II YI' - --

R2GB1.1326.8

R3G3C1.1729.2

RIUA0.9223.0

R2GC1.0526.3

R1 UA0.9022.3

IL IL _____________ .11 IL _____________ ______________R1UAR3GC;

1.1929.0

R1 UA0.9623.3

R3GC1.1728.6

RI UA0.9422.5

R2UD1.0625.0

i"RIUA0.9121.6

R1UA R3GB F RIUA R2GB R3GC R2UD " R1UA0.98 1.22 100 1.17 1.18 1.00 0.7622.0 26.7 L220 25.1 27.0 22.9 17.4

R:UA R3GB R2GB R3GB R2UC R2UA R2UA

0.95 1.20 1.16 1.20 1.00 0.82 0.5920.1 24.3 23.1 24.4 22.0 19.5 13.7

\

KIUA0.6914.2

KRUA0.8919.4

R2UA0.8618.7

R2UA0.8318.2

R3UA0.7015.8

. . . Region



(HFP, EqXe, ARO(1))

Figure 1(g)-4 Normalized Radial Power and Burnup Distributions at 23 GWD/MTUfor the First Cycle Core (Source: DCD Figure 4.3-8)




T S R P N M L K J H G F E D C B A180°-~ - - F - - - -

1 R2 R2 R2 R2 R2 R2 R2 R2 R2GB GA GA GA GB GA GA GA GB

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3

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8

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R2 1R2 IR1 R1 Ri JRi Ri JRi JRi IR RI R2 JR2GB IGl UA GA GB GA GA GA GB GA `UA GAI GB/R2 RI JR1 JRi R2 R2 JRI R2 RI JR2 R2 R1 IR1 iRi [R-2GB UAGB GA GBI UA GB GB GB UA GB jGA GBj UAI GB

R2 JRI 1R2 JR2 JRi R1 JRi R2 IR1 JRi JRi R2 JR2 IR1 JR2GA GB IGA IGB GBI GA IGB GB IGB GA GB GB GA I GB I GAR2 RI JR R2 R1 RI R2R2 R1 R2 R2 R1 R1R2 R RI R2

GB UA GA GB GA GB GB GB GB GB GB GB GA GB GA UA GBR2 R1 R2 R1 R1 R2 R1 R1 R2 R1 R1 R2 R1 RI R2 RI R2

GA GA GB GB GB GA GB GA GA GA GB GA GB GB GB GA GA

R2 R1 R2 RI R2 R1 R1 R2 R1 R2 Ri R1 R2 R1 R2 R1 R2GA GB UA GA GB GB GA GA GB GA GA GB GB GA UA GB GA

R2 R1 R1 R1 R2 RI R2 R2 R2 R2 R2 R1 R2R1 R1 R1 R2

GA GA, GB GB GB GA GA UA GB UA GA GA GB GB GB GA GAR2 RI R2 R2 R1 R2 R1 R2 R3 R2 R1 R2 R1 R2 R2 R1 R2GB GA GB GB GB GA GB GB GB GB GB GA GB GB GB GA GB

R2 R1 RI RI R2 RI R2 R2 R2 R2 R2 R1 R2 R1 RI R1 R2

GA GA GB GB GB GA GA UA GB UA GA GA GB GB GB GA GAR2 R1 R2 R1 R2 R1 R1 R2 R1 R2 R1 R1 R2 R1 R2 R1 R2

GA, GB, UA GA GB GB GA GA GB GA GA GB GB GA UA GB GA

R2 R1 2 Ri R1 R2 R1 R1 R2 R1 RI R2 R1 RI R2 RI R2GA GA GB GB GB GA GB GA GA GA GB GA GB GB GB GA GA

R2R1 R1 R2 R1 RI R2 R2 R1 R2 R2 R1 R1 R2 Ri R1 R2

GB UA GA GB GA GB GB GB GB GB GB GB GA GB GA UA GB

- 270'

R2 JRl R2 JR2 JRl R1 JR1 JR2 JR1 JR1 JRl 1R2 1R2 JRl R2IGA GB GA GB GBI GAIGB GB IGB GA GB IGB IGAI GBI GAI

R2 R1 JRI JRIR2 JR2 JRI R2 RI JR2 R2 R1 R1 1RI [R2GBIU GB GA GB UA GB- GB- GB- UA GB GA GBI UA GB

R2 JR2 JRI JRI JRI jRI JRI jRI IRl JRI iRI jR2 JR2GB IGA UA GA IGB IGA IGA IGA IGB IGA IUAI GA IGBN

R2 R2 R2 R2 R2 R2 R2 R2 R2GB GA GA GA GB GA GA GA GB

. . . Region name

0'Uranium rods/FA Gadolinia rods/FA notesRegion Number notes

Number U-Enrich. Number U-Enrich. Gd-Content Abs.LengthR1UA 12 264 4.55 wt% - freshR1GA 52 248 4.55 wt% 16 2.95 wt% 6 wt% 153.5 inches freshR1GB 64 240 4.55 wt% 24 2.95 wt% 10 wt% 153.5 inches freshR2UA 12 264 4.55 wt% -- - once burntR2GA 52 248 4.55 wt% 16 2.95 wt% 6 wt% 153.5 inches once burntR2GB 64 240 4.55 wt% 24 2.95 wt% 10 wt% 153.5 inches once burntR3GB 1 240 4.55 wt% 24 2.95 wt% 10 wt% 153.5 inches twice burnt

Abs. length: the upper and lower approximately 5.9 inches of the absorber rod does not contain absorber material

Figure 1 (g)-5 Typical 24-Month Equilibrium Cycle Core Loading Pattern(Source: MUAP-07016-P (RO) Figure A-2)



9

10

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12

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14

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16

17

J

R3GB0.8838.3

R2GB1.0525.0

H G F E D C B A

R2UA1.1321.3

R1GB1.140.2

R2GA1.0930.8

RR1GA1.330.2

________ ________ aL ________ I'.R2GA

1.1427.8

R1GA1.33

0.2

R1GB1.220.2

'R2GA1.0729.9

Im..r'n ii m',r'n lFnnnn irn~r.r, llm..r.*

1.190.2

1.1525.0

1.0929.1

r' 'ID

1.170.2

1.250.2

R2GB1.1123.7

RIGB1.170.2

RIGA1.280.2

RI1B1.160.2

R2GB1.0329.5

R2GA0.9630.1

R2GB R1GB R2UA [R2GB ~R1GA ]RGB 1R1UA1.08 1.13 1.09 1.05 2 1.0323.7 ] 0.2 24.5 29.6 J 0.2 0.2 , 0.2

R1GA R1GA R1GB R1GA R1UA IIR2GA r- R2GB1.06 1.04 FR0.94 1.8 1.24 II 0.65 I 0.400.2 0.2 0.1 0.2 0.2 29.5 29.3

R2GB0.5128.1

R2GA0.5225.3

R2GA0.4927.4

R2GA0.5127.7

R2GB0.4329.4

. . . Region



(HFP, EqXe, ARO(1)

Figure 1(g)-6 Normalized Radial Power and Burnup Distributions at 0.15 GWD/MTU forthe Typical 24-Month Equilibrium Cycle Core (Source: MUAP-07016-P (RO) Figure A-5)

Note: (1) Control Bank D withdrawn to'bite' position



9-

10

11

12

13

14

1 5

16

17

J

R3GB0.6446.4

R2GB0.7834.8

H G F E D C B A

"R2UA0.8732.0

I 3i

RIGB1.0312.0

R2GA0.9341.7

'R1GA1.3314.7

\ 1R2GA

1.0139.4

R1GA1.3114.6

R1GB1.2813.8

"R2GA1.0541.4

1.2113.2

1.0737.0

1.0540.7

1.2913.5

R1- A1.3514.3

I

R2GB1.0835.6

R1GB1.2813.5

R1GA1.3914.7

R1GB1.2613.4

R2GB0.9840.4

"R2GA0.8740.0

%

R R R2UA R2GB R1GA I - R1 RG1.12 1.30 1.09 0.99 1.21 0.97 I 0.8635.7 13.3 36.3 40.7 13.5 10.9I 10.3

RGA GA R1GB ] R1GA R1UA R2G R2G1.29 1.26 1.08 1.11 1.03 0.56 0.3512.9 12.6 11.1 12.0 12.3 36.0 33.4

\

R2GB0.6034.2

R2GA0.6031.4

R2GA0.5433.1

R2GA0.5133.2

R2GB0.3933.9

. . . Region



(HFP, EqXe, ARO(1 )

Figure 1 (g)-7 Normalized Radial Power and Burnup Distributions at 11 GWD/MTU for theTypical 24-Month Equilibrium Cycle Core (Source: MUAP-07016-P (RO) Figure A-6)




9

10

11

12

13

14

15

16

17

R3GB0.7154.2

R2GB10.8544.3I

H G F E D C B A

7R2-U-A0.9042.2

R1GB1.1224.9

R2GA0.9052.4

'R1GA1.2029.8

R2GA0.9651.0

RIGA1.1929.4

R1GB1.2329.3

"R2GA1.0053.8

3i

R1 GB1.2128.1

R2GB1.0049.5

R2GB0.9853.0

R1 GB1.2729.5

"R1GA1.2530.0

.1R2GB

1.0348.5

R1GB1.2629.3

RIGA1.2630.6

R1GB1.2528.9

R2GB0.9652.0

'R2GA0.9350.6

R2GB R1GB R2UA R2GB RIGA 'RG UA1.04 1.28 1.05 0.96 1.20 1.0248.8 29.4 49.1 52.3 27.6 21.2

R1GA 1 A R1GB RIGA R1UA R2G R2GB1.18 1.20 1.18 1.13 1.04 0.66 0.4627.7 27.4 24.8 25.2 24.3 43.1 38.1

R2GB0.6141.5

R2GA0.6438.8

R2GA0.6239.9

R2GA0.5739.5

R2GB0.4438.7

. . . Region

. . . Assembly relative power• . . Assembly burnup(GWD/MTU)

=1=- -_-__

(HFP, EqXe, ARO(')

Figure 1 (g)-8 Normalized Radial Power and Burnup Distributions at 23 GWD/MTU for theTypical 24-Month Equilibrium Cycle Core (Source: MUAP-07016-P (RO) Figure A-7)




REQUEST-2

Please provide the diameter and height from the bottom of the standpipe in theaccumulator.

RESPONSE

The information required is provided in Figure 21-4(1) of UAP-HF-08143-P (R1), whichwas the previous response by MHI to the TRACE/MELCOR RAI. In Figure 21-4(1), theunits of the values in parentheses are inches.



REQUEST-3(a)

More detailed design information on the steam generators is required in order to developmodels for confirmatory analysis of US-APWR. Please provide the following data, in theform of lists and/or dimensioned engineering drawings from which the same data can beobtained. Information can also be provided as equivalent data from which the requestedquantities can be calculated (e.g., instead of inside and outside diameter, providing justinside diameter and thickness). For requested elevations, please provide them relative tothe top of the tube sheet or to some other consistent and clearly defined offset.(Follow-up to Request 1-3 from UAP-HF-08143-P (RO).)

a) Primary circuit inlet and outlet nozzles: Elevations; inside and outside diameters at thejunction to the hot leg; inside and outside diameters at the junction to the plenums;angle(s) with the vertical.

RESPONSE

Unless otherwise noted, all of the following responses for the steam generators give therequested elevations in relation to the top of the tube sheet.

Table 3(a)-i Primary Circuit Inlet and Outlet Nozzle Parameters



REQUEST-3(b)

b) Primary circuit inlet and outlet plenums: Bottom elevations; wall mass (or insidesurface area) and average thickness; and mass, material, and average thickness ofany other structures.

RESPONSE

Table 3(b)-1 Primary Circuit Inlet and Outlet Plenum Parameters

Table 3(b)-2 Primary Manway Cover Parameters (2 pieces)

KK

jI



REQUEST-3(c)

c) Primary circuit inlet and outlet plenums divider plate: Mass (or single-sided surfacearea), material, and thickness.

RESPONSE

Table 3(c)-1 Primary Circuit Inlet and Outlet Plenum Divider Plate ParametersL



REQUEST-3(d)

d) Do the tubes project any distance below the bottom of the tube sheet into the inlet andoutlet plenums? If so, please give length of projection (or elevation of the bottomedge of the tubes).

RESPONSE

The tubes do not project below the bottom of the tube sheet into the inlet and outletplenums.



REQUEST-3(e)

e) Radial profile of the tube arrangement in the straight section, with radius from thesteam generator centerline of each tube (or group of similar tubes).

RESPONSE

Table 3(e)-i Tube Arrangement Parameters

Row by row radius details are shown in Table 3(e)-2 on the next page.



REQUIEST-3(f)

f) Tube bundle: Elevation of top of tube bundle (i.e., top of tube bend for the outermosttube(s)).

RESPONSE

Table 3(f)-1 Tube Bundle Parameters



REQUEST-3(g)

g) Shell: Top elevation of lower shell (point where inside diameter begins to change) andbottom elevation of upper shell (point where inside diameter stops changing).

RESPONSE

Table 3(g)-1 Shell Parameters



REQUEST-3(h)

h) Steam separator ("Primary Moisture Separator"): Bottom elevation of standpipe, heightof standpipe, inside and outside diameters of standpipe, height of centrifugal separatorportion, inside and outside diameters of centrifugal separator portion, mass of swirlvanes or other internal structures, elevation of liquid return from separator, flow area ofliquid return, minimum flow area for steam/mixture within centrifugal separator region.Please state whether quantities are for an individual separator unit or for the entireassembly within one SG.

RESPONSE

Table 3(h)-1 Primary Moisture Separator Parameters



REQUEST-3(i)

i) Steam dryers ("Secondary Moisture Separator"): Number of units, bottom elevation,height, surface area, mass, material(s), elevation of liquid return, minimum flow area forsteam within dryers, flow area of liquid return. Please state whether quantities are foran individual dryer unit or for the entire assembly within one SG.

RESPONSE

Table 3(i)-1 Secondary Moisture Separator Parametersr



REQUEST-3(i)

j) Feed water: Elevation of nozzle; inside and outside diameters of nozzle; elevation offeed ring (exit point of perforated nozzles); diameter of each feed ring perforatednozzle; number of perforated nozzles (or total feed water flow area of perforatednozzles).

RESPONSETable 3(j)-l Feedwater Related Parameters

-1



REQUEST-3(k)

k) Tube wrapper: Bottom and top elevations; inside and outside diameters; material.

RESPONSE

Table 3(k)-1 Tube Wrapper Parameters



REQUEST-3(I)

I) Tube support plates: Elevations (each of eight); thickness; and open flow area withineach "broached hole" around a tube.

RESPONSE

Table 3(I)-1 Tube Support Plate Data

Mitsubishi Heavy industries, LTD. 30Mitsubishi Heavy Industries, LTD. 30


REQUEST-3(m)

m) Tube bundle anti-vibration bars: Material, mass, and average thickness.

RESPONSE

Table 3(m)-1 Tube Bundle Anti-Vibration Bar Data




REQUEST-3(n)

n) Main steam exit nozzle: Elevation (i.e., inside top of upper shell), inside and outsidediameters.

RESPONSE

Table 3(n)-i Main Steam Exit Nozzle Parameters



REQUEST-3(o)

o) Total secondary-side free volume (i.e., excluding tube bundle and any internalstructures) from the top of the tube sheet up to the steam exit nozzle.

RESPONSE

Table 3(o)-I Total Secondary-Side Free Volume

I 2



REQUEST-3(p)

p) Any other internal structures not previously mentioned: Material, mass, averagethickness, elevation, height, orientation (vertical, horizontal, or mixed), number.

RESPONSE

Table 3(p)-i Flow Restrictor Venturi Parameters

r



REQUEST-4(a)

More detailed design information on the pressurizer is required in order to develop modelsfor confirmatory analysis of US-APWR. Please provide the following data, in the form oflists and/or dimensioned engineering drawings from which the same data can be obtained.Information can also be provided as equivalent data from which the requested quantitiescan be calculated (e.g., instead of inside and outside diameter, providing just insidediameter and thickness). For requested elevations, please provide them relative to someother consistent and clearly defined offset. (Follow-up to Request 1-2 fromUAP-HF-08143-P (RO).)

(Note: Since it is understood that pressurizer sprays have not been credited by MHI in theLOCA analyses, information concerning this system may be provided later as part of theresponse to the requests for transient (non-LOCA) information, as described in theintroduction to the previous RAI responses.)

a) Please provide the elevation and minimum flow area of the pressurizer spray header in

the pressurizer.

RESPONSE

The elevation and minimum flow area of the pressurizer spray header are given inTable 4(a)-i below.

Table 4(a)-I Pressurizer Spray Header Values



REQUEST-4(b)

b) Please provide pipe run diagrams (with lengths, pipe sizes, angles, and elevations) forthe pressurizer spray lines, from the cold leg scoops to the pressurizer spray nozzle.

RESPONSE

The pipe run diagram is shown in Figure 4(b)-i below.1f

{Security Related Information-Withhold Under 1OCFR2.390}

Layout

-I

Figure 4(b)-i Pipe run diagram for the pressurizer spray lines



REQUEST-4(c)

c) Please provide information on procedures or automatic control guiding the use ofpressurizer sprays after scram and during general transient accident conditions (e.g.,would the sprays continue to be used as long as there is liquid remaining in the cold leg,or would they be discontinued at some earlier time?).

RESPONSE

The pressurizer spray control function is described in DCD Section 7.7.1.1.5 "PressurizerPressure Control," DCD Section 7.7.1.1.6 "Pressurizer Spray Interlock," and DCDFigure 7.2-2 sheet 19. The control setpoints for the spray controller were provided in theresponse to Request 14 in the previous TRACE/MELCOR RAI response by MHI letterUAP-HF-08143-P (R1).

As shown on the DCD Figure 7.2-2 sheet 19 functional logic diagram and described inDCD Section 7.7.1.1.6, pressurizer spray has a pressure interlock to prevent excessivedepressurization of the RCS by blocking an automatic or manual pressurizer spray valveopening signal. The automatic pressure control function can be manually selected by theoperator when nominal pressure is established during plant startup after the interlock hascleared. The pressurizer spray interlock may be manually bypassed to allow plantdepressurization for cold shutdown.

Automatic pressure control can be maintained from zero to 100% power, and is notautomatically disabled by a reactor trip. The driving force that delivers the spray watersurged from the cold legs at the reactor coolant pump (RCP) discharge into the vaporphase at the top of the pressurizer is provided by the operating RCP discharge head. Asa result, pressurizer spray control is only available when the RCPs are operating in loopswith a spray line scoop. The US-APWR has an automatic RCP trip on an ECCSActuation Signal in coincidence with a reactor trip signal (DCD Figure 7.2-2 Sheet 11), sopressurizer spray is not available under these conditions when the RCPs are tripped.

Each pressurizer spray valve (regarding A or B) has an auto-manual control, that allowstransfer between the automatic control mode by pressurizer pressure control or componentlevel manual control mode. In the manual mode the operator can fix the spray valveposition.

Additional details on the operation and limitations for normal pressurizer spray will beincluded in plant operating procedures when they are developed.



REQUEST-4(d)

d) Please provide further information on the conditions and procedures for injection ofCVCS water into the pressurizer spray lines, if such are currently available.

RESPONSE

As described in DCD Section 9.3.4, a pressurizer auxiliary spray line branched fromdownstream of the CVCS regenerative heat exchanger is provided. Normally, pressurizerauxiliary spray is used at the end of plant cooldown, when the reactor coolant pumps arenot operating. During plant shutdown, when the RHR system is in operation, the RHRsystem provides reactor coolant to the CVCS and cooling of the pressurizer fluids can beaccomplished by charging through the auxiliary spray connection as an alternative path tonormal pressurizer spray. At this phase of the design, the conditions of the auxiliary sprayare assumed to be a flow rate of 160 gpm and a temperature 130°F (the same as normalcharging flow). The pressurizer auxiliary spray has no safety function for accidentmitigation. However, when available, it also provides a means for depressurization of theRCS when none of the RCPs are operating. Detailed procedures will be prepared whenthe plant operating procedures are established.



REQUEST-4(e)

e) Please provide the volume, surface area, bottom elevation, and height of thepressurizer heaters (control group and backup groups).

RESPONSE

The requested information is provided in Table 4(e)-i below.

Table 4(e)-i Requested Values for each Pressurizer Heater

Other dimensions concerning the arrangement of the heaters are shown in Figure 4(e)-1.




REQUEST-5

More detailed design information on the primary circuit (cold leg, hot leg, and crossoverpiping) is required in order to develop models for confirmatory analysis of US-APWR.Please provide the length, inside and outside diameter, angle with the vertical, andelevation of every straight pipe section, and the same information plus turning radius foreach curved section of pipe. (For example, the hot leg consists of one straight horizontalsection from the RPV nozzle, followed by a partial section of curved pipe into an angledstraight section leading to the SG inlet nozzle. Please provide the lengths, diameters,angles, etc. for each of these three sections, and similarly for the crossover and cold leg.)(Follow-up to Request 3 from UAP-HF-08143-P (RO)).

RESPONSE

The plan and section views of the reactor coolant loop are shown in Figure 5-1. Thisfigure provides more detailed design information than the one given inUAP-HF-08143-P (R1).


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