ML20207L926
| ML20207L926 | |
| Person / Time | |
|---|---|
| Site: | Catawba, McGuire, 05000000 |
| Issue date: | 09/30/1988 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20207L914 | List: |
| References | |
| WCAP-10989-ADD, WCAP-10989-ADD-02, WCAP-10989-ADD-2, NUDOCS 8810180030 | |
| Download: ML20207L926 (85) | |
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) WESTINGHOUSE CLASS 3 l
l WCAP-10989 r 4 Addendum 2 )
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I COBRA-NC, ANALYSIS FOR A MAIN STEAMLINE BREAK i i
IN THE CATAWBA UNIT 1 ICE CONDEN3ER CONTA!NWENT(RESPONSETONRCQUESTIONS) ,
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! SEPTEW8!R. 1988 1
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WESTINGHOUSEELECTRICCORP0(ATION
]
j NUCLEAR ENERGY SYSTEMS
] P. O. 00X 355 P m sauRsN, PtNNsVLvANIA 15n0
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1043r.10400784 l
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TABLE OF CONTENTS l
SECTION TITLE PAGE
! 1.0 SUKMARY 1-1 l
2.0 RESPONSE TO NRC QUESTIONS 2-1
3.0 REFERENCES
3-1 l
i Il43v 10/190764 i
LIST OF FIGURES FIGURE TITLE PAGE 1 Channel Layout for Level 1 23 1
l 2 Dimensions for the Pipe Tunnel 2-9 i
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LIST OF TA8LES TA8LE TITLE PAGE 1 GAP 3 (Door 8) 2-12 2 GAP 10(Door 12) 2-16 3 GAP 17(Door 16) 2-20 4 GAP 24(Door 20) 2-24 5 GAP 31 (Door 24) 2 28 6 GAP 38 (Door 28) 2-32 7 GAP 45 (Door 32a) 2 35 8 GAP 156 (Door 32b) 2 40 9 GAP 124 (Door 32c) 2-44 10 GAP 52 (Door 36) 2-48 11 Axial Area Da+a 2 52 12 Lateral Area Data 2 60 13 Hydraulic Diameter for Lateral Connections 2-75 e
1 l
1.0 SUWARY l The NRC has authorized the ANL to pe-f;;r an independent confirmatory analysis
. using the CONNIX code to calculate the resulting conditions of the main steam line break in ice condenser contain u nts. ANL had reviewed the ice condenser containment sedel developed by Westingneuse using the C06RA NC code for the Catawba Unit 1 ice condenser documented in WCAP-10988. Questions were raised by ANL in April 1988 concerning the COBRA-NC model, and answers were provided to ANL in May 1988, and were documented in Addendum 1. WCAP-10988. Additional information was requested by ANL/NRC in July 1984. This addendum addresses these requests / questions. Specifically this addendum provides detailed informatien on: 1) mass flow rates through the condenser doors as a function of time 2) nominal and blocked flea areas in both axial and transverse dire:tions, 3) the geometry of the pipe tunnel and 4) hydraulic diameters far l lateral flow connections.
9 isu ,iom m es 11 l
. _ = - _ - - _ - - __._ _- - .- . _ _ _ . _. . _ _ - .- . ._
I I 2.0 RESPONSE TO ANL/NRC QUESTIONS i
)*
Questien i l
l 1
The volume porosity or actual fluid volume at each basic mesh cell in J CO6RA NC/Model 3 l 1
i
) i i In response to question 3: " ....!t is g the voltmo porcsity defined by the equation shown in the question. The volumes listed in Table 5.2 are those f
I occupied by fluid in each cell; they arti not the total control volume for the j cell.' l
- a. The above statement is incorrect, because by using the radii and dividing j ang'es as given in Fig. 1, or by the inspection of the values in Table ;
l 5.2, it can be shown that the volumes Itsted in Table 5.2 are the total centeelvolumeforthebasicmeshcellsforC06RANC/Wede1J.
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- b. Page 77 of the WCAP 10908 report: 'The nominal and actual volume and the i
] hydraulic diameter for each cell a,e given in Table 5.2.* l l
i, Since the actual volume is not listed in Table 5.2. does the above l statement indicate that it can be calculated from the product of the i nominal volume and the porosity? If so, what values of volume porosity -
are used for levels 9 and 10 in Model 37 li' the porosity listed in Table l l
3.2 is not the volume porosity as defined by COMMIX, please provide the l volume porosity or the actual volume occupied by fluid at each basic cell l in C06RA-NC/Wedel 3 i j n.ioeni. to ou.itten 1 4
- a. The definition for the ' volume porosity
- given by the 4/18/88 transmittal I from ANL/NRC to TVA was Volume porosity
- Volume occupied bv fluid in a control volume Total control surface l
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This equation is incorrect. The "porosity" shown in Table 5.2 of WCAP-10988 is not the "volume porosity" defined by this equation, as was indicated in WCAP-10988, Addendum 1. The "volume porosity" dofinition .
should have been Volume porosity
- Volume occupied by fluid in a control volume Total control volume and this was confirmed by T. S. Chien of ANL during a telephone conversation on 7/12/88. According to this corrected definition, the porosity given by Table S.2 which was tha atio of the actual continuity-cell area to the nominal coatinuity-cell area, is equivalent to the volume porosity so defined since the cell length in the axial direction is the same.
- b. The volumes listed in Table 5.2 of WCAP-10988 are the total control volumes for the continuity cells of COBRA-NC/Models 1 and 2. In Model 3, the top level (level 8) from Models 1 and 2 was divided into two caual .
height levels (0 and 9). The ficw area the volume and the volume porosity were assumed to be the same for these two levels.
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Ouestion 2
~
The surface porosity or the actual flow area at each basic mesh cell in COBRA-NC/Model 3 In response to question 3: "For the transverse directions, the flow areas are given by (gap width)*(cell height)." By checking the information given in Fig.1, these flow areas are the nominal flow steas. Please provide the actual flow areas ir, the transverse directions for each basic cell.
Response to Question 2 The nominal and the blocked areas for the gaps in the lateral directions are listed in Table 12 of this Addendum. Please see Table 12 for details.
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1543v:10/ot0784 2-3
_ _ _ _ . . . , , . _ . _ .-. - ,- - a
Ouestion 3 The hydraulic diameters in the transverse directions In response to question 2:
"In the transverse directions, the flow areas are calculated differently by (gap width)*(cell height). The wetted perimeters are calculated internally in the code based on the length of the gap, the numbers of the walls, and the height of the cell. These parameters are entered into the code by INPUT DATA LINES 354-569."
Since the flow areas are the nominal flow areat and the wetted perimeters are calculated internally, the hydraulic diameters can not be calculated from the available information in the report. Please provide the values of hydraulic diameters in the transverse directions used in COBRA-NC/Model 3 calculation.
Resoonse to Question 3 Values of hydraulic diameters in the transverse directions used in the COBRA-NC/Model 3 are listed in Table 13 of this Addendum. Please see Table 13 for details.
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1sast.io/oso7ss 2-4 l l
Ouestion 4 The tabulated mass flowrates through the ice condenser doors as a function of time at each sector In the Westinghouse response to question 7, the mass flowrates through doors 32a, 32b, and 32c are given in Tables 1, 2, and 3. Please explain how to use these tables and also provide the mass flowrate through the rest of the ice condenser doors, i.e., doors 8,12,16, 20, 24, 28, and 36. Please provide more detailed information at different time steps if it is availablo.
Resoonse to Question 4 Mass flow rates (liquid, vapor and entrainment) for doors 8, 12, 16, 20, 24, 28, 32a, 32b, 32c and 36 are listed. Please see Tables 1-10 for detail.
Please note the total liquid flow is the sum of the "liquid" and the "entrainment" flows shown in the tables. The "door" is represented by cells with axial range from 360.3 in. to 982.7 in.
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1ss3v:1D/0:07:e 2-5
Question 5 The location and dimension of the 8-foot high pipe tunnel underneath the spent '
fuel storage area In the response to question 5. Westinghouse did not provide the dimension of the pipe tunnel. Please provide the location and dimension of the tunnel and describe its functions and importance in the lower containment.
Response to Question 5 A description for the pipe tunnel model is shown on the next page. Please also see Figures 1 and 2 for its location and detail dimensions.
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PIPE TUNNEL MODEL DESCRIPTION E
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. 1 Figure 1 - Cham el Layout for Level 1 Isso,iofoeoess 2-8
L9,Q Figure 2 - hions for the Pipe Tumel O
2-9 1ssov.tomeossa
Ouestion 6 Explanation of the variation tables listed in the INPUT DATA LINES 872-1748 From the response to quest'ons 3 and 4, it indicates that the variation tables -
for the axial area multipliers, the axial perimeter multipiiers, the axial loss coefficients, and the lateral loss coefficients used in C08RA-NC are given in INPUT DATA LINES 872-1748. Please explain how these tables are used in Section B of Model 3, where 9 axial levels are u:ed to model the lower containment.
Resoonse to Question 6 In the Input Data list given by WCAP-109BS, variation table numbers are liste:
from Lines19-145 for all the channels, c,3,c )
Numerical values for the multipliers at all the nodes are given in Lines 872-1748.
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Table 11 and Table 12 of this Addendum contain hrformation for the nom the blocked flow areas at theThe somentus-cell centers in the axial and the form-loss coefficient may be determined lateral directions, respectively.
by the information provided in these tables and by using published flow-restriction coefficient tables or curves.
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[
3.0 REFERENCES
3.1 Letter from NRC, Ms. S. Black, to TVA, Mr. S. A. White, entitled, Request for Additional Information Regarding Main Steam Line Breaks in Ice o
Condenser Plants - Sequoyah Units 1 and 2 and Wat'.s Bar Units 1 and 2, dated July 15, 1988, with attachment entitled Addftional Information Needed to Prepare COMNIX Input for Modeling the Catawba Ice Condenser Containment af ter Reviewing the Westinghouse Report WCAP-10988, Addendum 1.
1 4
f t
)
l t
issh:to/coores 3-1 l
i 1
. _ _ - - . - _ - , _ _ _ _ _ _ _ _ _ _ _