ML20154Q094
| ML20154Q094 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah, Catawba  |
| Issue date: | 05/31/1988 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19292H876 | List: |
| References | |
| WCAP-10989-ADD, WCAP-10989-ADD-01, WCAP-10989-ADD-1, NUDOCS 8806060184 | |
| Download: ML20154Q094 (30) | |
Text
WESTINGHOUSE PROPRIETARY CLASS 3 WCAP-10989 Addendum 1 COBRA-NC, ANALY$IS FOR A MAIN STEAMLINE BREAK-IN THE CATAWBA UNIT 1 ICE CONDENSER CONTAINMENT (RESPONSE TO NRC QUESTIONS)
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TABLE OF CONTE?RS SECTION TITLE PAGE 1.0 Sumary 1-1 2.0 Response to NRC Questions 2-1 30 References 3-1 a
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LIST OF FIGURES j
FIGURE TITLE PAGE 1
Definition Sketch for Section B 2-11 l
2 Nfinition Sketch for Gap 2-12 i
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LIST OF TABLES TABLE :
TITLE PAGE 1
Sumary for Gap 45 2-13 2
Strnmary for Gap 156 2-17 3
Sumary for Gap 124 2-21 1
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SUMMARY
Bis addendum responds to NRC questions regarding the COBRA-NC/Model 3 calculations in the WCAP in order for the NRC to authorize the Argonne National Laboratory (ANL) to review them. ne NRC is authorizing ANL to perform an independent confirmatory analysis using the computer code C0tHIX to calculate the resulting condition of the main steam line. break in ice condenser containments.
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20 RESPONSE TO NRC QUESTIONS
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QUESTION 1 j
the values of or and 60 in generating the computational cells as shown in Fig.
2.10.
Page 15: "The interior of the lower contairrnent is divided into three radial rings and eight sectors." Provide the specific values of the radial (or) and circumferential (40) dimensions for each cell.
RESPONSE TO QUESTION 1
'Ihe radii of the rings and the dividing angles are shown in Fig.1 attached.
Please see Fig.1.
QUESTION 2 (1) Describe how the hydraulic diameters listed in Table 5.2 were calculated.
(2) Page 75: "Nominal areas and wetted parameters were nomally based on the size of the subchannels as shown in the plans views for each section. Area and wetted parameter multipliers were then applied for each axial elevation to account for equipment and structural changes."
Were the actual flow area and the wetter parameter for calculating the hydraulic diameter at each cell obtained frce the above statement?
(3) Are the area and wetted parameter multipliers only applicable in the axial direction for each ccreputational cell? If not, there should be three hydraulic diameters calculated from three sets of flow area and wetted parameter for a particular cell since the flow is three-dimensional. How did COBRA-NC resolve this problem?
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RESPONSE TO QUESTION 2 (1) ne hydraulic diameters of Table 2 were calculated by the equation 4.0'AN/PW, where AN is the "ncuninal continuity cell area" ano PW is the wetted perimeter. Example: Consider the 1st line of Table 5.2.
The voltane for the botten cell of Channel 1 in Section A is 9652.00 ft.3 The height of this cell is 14.04 ft. (SEE INPUT DATA LINE 752). ne
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nominal continuity cell area AN is then 9652.0/14.04:687.5 ft.2 (SEE LINE 19). INPLTT DATA LINE 19 also gives PW=114.6 ft. D e reference hydraulic diameter is then:
4.0'AN/PW:4.0'687.5/114.6=24.00 ft.
a,c (2) The stateraent given in page 75 is true. The hydraulic diameter is based on the actual flow area (at center of the momenttn cell) and the wetted parameter.
(3) ne area and wetted parameter multipliers are only applicable in the axial (vertical) direction.
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QUESTION 3 The actual flow area between cells.
In NX, the voltsee porosity and surface pemeability are introduced in the fomulati n of governing equations. De voltane pcrosity and surface pemeab211ty are defined as Voltxte porosity = Volute occupied by fluid in a control voltr:e Total control surface Surface pemeability = Area allowed for fluid flow throuch a control surface Total control surface I
The voline porosity for each cell in the COBRA-NC model is provided in Table 5.2, while the surface pemeability is not available in the report, although the area multipliers and flow restricted area have been mentioned on page 75.
Provide the actual flew area between cells for every cell in Section A, Section B, and vessel enclosures of Section C of the COBRA-NChbdel 3 1ESPONSETOQ1MTION3 he "porosity" shown in Table 5.2 is the ratio of the actual continuity-cell area to the nominal continuity-cell area of the channel. It is NOT the voltne
. porosity defined by the equation shown in the question. he voltries listed in Table 5.2 are those occupied by fluid in each cell, they are not the total control voltue for the cell.
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If the momentum-cell parameters are entered as 0.0 (or blank), they default to the continuity-cell vslties. The area multipliers are given in the variation tables listed in the INPUT DATAj!eck LINES 872-1748. Using this infonnation, all the axial flow areas can be obtained.
s For the transverse directiorn, the flow areas are given by (gap width)*(cell height), as described in Response to Question 2 (2-3).
QUESTION 4
'Ihe loss coefficients and other drag coefficients used in ecruputing the pressure drop between cells.
On page 75: "Flow area restrictions were conservatively modeled using sharp l
edge orifice loss coefficients, which would reduce the flow between cells.
Nominal flow areas were used computing velocities."
What is the restricted area between cells? Is it related to the surface permeability as described in Itern 37 Which correlation was used in c:dculating the loss coefficient? If the correlation is based on the area ratio ar,d Reynolds number, what is the other area used besides the orifice area and how was the Reynolds number ow.mted? Provide the loss coefficients and other drag coefficients used in the COBRA-NChtx$el 3
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RESPONSE TO QUESTIOR 4,,
In the INPUT DATA list, the index for the axial fonn-loss coefficient table for each channel is giv'en by COLUMNS 46-50, kom LINE 19 to LINE 146 The tables are shown in LINES 872-1748 a.C J
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t If the loss coefficients entered in the even-nubtred lines are defaulted (0.0), the code will take the table indicated in the next odd lines and use the inputed values of these tables as the for:n-loss coefficients. De tables are listed in the INPlTI DATA LINES 873-1748.
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QUESTION 5
'!he location and dimension of the 8 foot high pipe tunnel underneath the spent fuel storage area.
On page 5: "An 8 ft. high pipe tunnel runs underneath the spent fuel storage 2 -
region so that there is flow cormunication around the full 360 at this level."
Wich cells are connected to the pipe tunnel in the CDBRA-NC model?
RESPONSE TO QUESTION 5 Bsc t
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QUESTION 6 Material properties of heat conductors.
k' hat values of thermal conductivity, heat capacity, and density of the heat conductors described in Table 5.1 a. e used in the CDBRA-NC calculation?
Is the thermal resistance of paint on concrete and steel surfaces being considered? If yes, 'fhat is the thickness'of paint used in the calculation and what is the material property?
RESPONSE TO QUESTION 6 8.C There were 6 geometry types as indicated in Table 5.1.
They were also specified in the INPUT DATA LINES 2037-2053 Each of the geccetry types may contain several regions of different mcterials. Four basic materials (concrete, stainless steel, carbon steel and insulaticn) were ased, and were a.c I
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QUESTION 7 Ee tabulated mass flowrate through the ice condenser door as a function of time at each sector.
De COBRA-NC/Model 3 results show the ice condenser door vapor velocities in Figures 6.57 through 6.58 for doors 32a, 32b, and 32c. Where are these three doors located? Tabulate the mass now rate throu6h the doors.
RESPONSE TO QtESTION 7 I
Ibors 32a, 32b and 32c are the int.erfaces between mannel 32 and channels 31, 107 and 110, in Section B, respectively (see Figure 5.4).
In the COBRA-NC's INPUT DATA, these doors were represented by Gaps 45 (LINE 342),156 (LINE 562) and 124 (LINE 568). The flow rates through these doors (gaps) are shown in the tables attached.
QUESTION 8 l
De ninerical values of the calculated drain mass flowrate and distribution in COBRA-NC/Model 3 (1) De calculated drain mass flowrate as shown in Figures 6.61 and 6.62 on page 171 are difficult to read.
Provide values of the drain flowrate as a function of time for it> del 3 2-8 i
(2) How were drain flows distributed for the finer mesh channels in Model 3?
Is the average value being used for the three subchannels? If not, describe how it is used and provide the drain flow droplet and film injection factors similar to Tables 4.5 through 4.15 for Model 3 RESPONSE TO QUESTION 8 (1) Numerical values for the drair, ficws are tabulated in the table shown below:
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(2) Yes. The average values were used for the three subchannels (evenly distributed).
QUESTION 9 Correction or revision of the report.
We have found scce errors in the report; for example:
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(1) Figure 2.10 cnd Figure 5.4 are the same. Dere is no figura that describes the grid layout of Section B for the COBRA-NC/Model 2 in the report, while all data listed in Tables 5.2 and 5 3 is for Model 2.
(2) On page 162, the physical structure in the middle figure is different frcn the other two.
(3) ne description of the ice condenser doors in the last paragraph of page 134 is not consistent with Figure 6.22.
Confinn the accuracy of the values in, Tables 4.3 through 4.15 and Tables 5.1 through 5 3 he COMMIX code will use the current infonnation as input.
RESPONSE TO QUESTION 9 (1) "he subchannels 105-110 shown in Figure 2.10 should have been deleted, as shown by Figure 1 attached.
(2) he drawin6s for the structure in the t'op and bottom figures on page 162 were in error. Tney should have been the same as that 'in the middle figure on page 162.
(3) De last paragraph on page 134 should hcVe been written as:
On the hotter side of the containment, door 28 closed at 200 seconds, door 32 above the break closed at about 275 seconds, door 24 never ccepletely closed and door 36 received most of the steam flow during the later parts of the transient.
We values shown in Tables 4.3 to 4.15 and Tables 5.1 to 5 3 are correct.
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3 0 REFERENCES 31 Letter from NEC, Mr. G. G. Zech, to TVA, Mr. S. A. White, entitled, Request for Additional Infonnation Regarding Main Steam Line Breaks In Ice Condenser Plants, dated April 8,1988, with attachment entitled Request for Additional Infonnation for the Review of Topical Report WCAP-10988, Main Steam Line Break In Ice Condenser Containments.
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