ML113070694
| ML113070694 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/03/2011 |
| From: | Ameren Missouri |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML113070702 | List: |
| References | |
| LDCN 11-0010, ULNRC-05774 | |
| Download: ML113070694 (33) | |
Text
ATTACHMENT 5 CONTROL BUILDING ROOM LOCATIONS AND P&ID EXCERPTS
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ATTACHMENT 6 CALCULATION GK-19, REVISION 0, ADDENDUM 3, 2016 AUXILIARY BUILDING BATTERY AND SWITCHBOARD ROOM GOTHIC TEMPERATURE ANALYSIS
Calculation: GK-19, Rev. 0 Add. 3
Title:
2016 Aux. Building Battery and SWBD room GOTHIC temperature analysis
Description:
This calculation will model the temperatures of the 2016 Aux. Building Battery and SWBD rooms using the GOTHIC modeling software. This analysis will include the effects of impaired air conditioning and a range of time delays in opening the room doors.
Kurt Linsenbardt Responsible Engineer: PIN#70901 See electronic signature 6/29/2011 Name (printed) Signature Reviewing Engineer: Thomas Carr PIN#990 See electronic signature 6/29/2011 Name (printed) Signature Supervising Engineer Approval: Jim Little PIN#3557 See electronic signature 6/29/2011 Name (printed) Signature
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 2 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr 1.0 PURPOSE
- This calculation will model the temperatures of the 2016 Aux. Building Battery and SWBD rooms using the GOTHIC modeling software. This analysis will include the effects of the loss of one train of Class 1E air conditioning, and a time delay in opening the room doors. This will show how effectively the alternate train rooms are cooled by the airflow through the doors and, ultimately, the other train of Class 1E A/C.
2.0 METHODOLOGY The methodology used in this calculation will treat each room as a single lumped volume using two one directional flow paths for each major vent path. The thermal hydraulics modeled between and within the lumped volumes will be those integrated into the GOTHIC 7.2a software package. The 2000 ESF Switchgear rooms are also included in the model due to the potential impact of their heat loads.
3.0 ASSUMPTIONS
- 1. The doorways between the 2016 Battery and SWBD rooms, and the doors leading out to the 2016 hallways are opened simultaneously and instantaneously after a given duration into the event. As long as Operations has all of the doors opened by the point the model specifies, the model will be conservative. This is due to the fact that having some of the doors opened early will give extra cooling to the rooms.
- 2. The models were run with the doors opening at one and two hour intervals from the start of the accident, and then at two hour intervals from four to eight hours, and then one last run with them opening at the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> mark. These were chosen to allow Operations adequate time to respond in the event of an A/C train failure, while still assuming that they would be able to respond within one shift of the failure.
- 3. All air and concrete are assumed to start at 80°F.
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 3 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr
- 4. HVAC flow to the area is assumed to be at a constant air temperature of 80°F.
- 5. The surrounding environment on the other side of the concrete walls is assumed to stay at 80°F for the duration of the 30 day run.
- 6. A 14.7 psia pressure boundary is included to prevent the levels from pressurizing.
This is conservative, as the calculation is only concerned with the room temperatures, and not the room pressures. Due to it being a 30 day run, modeling it as an airtight volume would cause issues with pressure transients in the GOTHIC modeling software.
- 7. All concrete is considered to be homogenous, with properties (such as density) not varying with temperature. As the temperatures only change by ~50°F, the difference in material properties with temperature is negligible.
- 8. Heat transfer through the closed doors is omitted. After the doors are opened at the six hour mark, they would no longer act as thermal conductors, and the GOTHIC program does not allow conductors to disappear in this fashion. As the temperature increases occur due to the heat sources inside the rooms, by removing a way for heat to escape the room, this will result in a conservative temperature.
- 9. No fire protection systems were modeled for the sensitivity runs. Due to the maximum temperatures remaining below the actuation temperatures of the fire dampers it is unnecessary to include them in the model.
- 10. It is assumed that the height of the ceilings in all rooms is 14 1/3 ft. This represents 16 feet nominal between floors, minus the assumed concrete floor thickness of one foot, minus an additional factor of conservation to represent room equipment taking up space in the room. This is conservative due to the fact that minimizing volume limits the mass of air in the room and increases the effects of heat addition on room temperature.
- 11. Only one door in a set of double doors will be blocked open. This is conservative in reducing the available airflow, and is consistent with past operator instructions.
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 4 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr
- 12. No thermal conductors other than structural concrete are included. This is conservative as the additional conductors would only serve as heatsinks and would remove heat from the atmosphere.
- 13. No credit is taken for any non-HVAC airflow from the floors (aside from the pressure boundaries). This is conservative as omitting the potential flow from the stairwells reduces the amount of buoyancy driven flow available to cool the areas.
- 14. Floors and ceilings are modeled as one foot concrete, and external walls are modeled as two foot thick concrete as estimated from floor layout drawings (Reference 1).
- 15. Each doorway and transfer grill flowpath was given an exit loss coefficient of 2.8 to account for the flow restriction of the path geometry. This is based off of discussion with the makers of GOTHIC. Omitting the exit loss coefficient would allow the airflows to reach unrealistic speeds and would cause greater than normal cooling.
4.0 DESIGN INPUTS The room dimensions in Table 1 were taken from the Control Building floor layout drawing (Reference 1). The heat loads in Table 2 were taken from GK-10, the previous SWBD room heatup calculation (Reference 2) and the HVAC parameters in Table 3 were found in the Control Building HVAC drawing (Reference 3&4).
The door parameters in Table 4 were found on the Door Schedule drawing (Reference 5).
The control building HVAC drawings show a grate in-between the SWBD rooms and their respective Battery rooms. The M-2H3411 drawing (Ref. 4) gives the dimensions of the grates as 12x12. Similarly, the M-2H3311 HVAC drawing (Ref. 3) indicates the presence of two 24x24 transfer grills between the two ESF Switchgear rooms.
All internal walls are modeled as 8 inch thick concrete (Note 2, Ref. 1).
In order to properly model the interaction between the two trains Corridor 1 (Room
- 3401) was divided into north and south halves, as shown in Figure 1. The T junction between Corridor 2 (Room #3406) was modeled by dividing the intersection into a three different flowpaths, one between the N-S halves of Corridor 1, and one from each half of
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 5 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Corridor 1 into Corridor 2. This allows the airflow to flow between all three different hallways.
Width Length Rooms (ft) (ft)
SWBD 1 18.7 22.7 SWBD 2 18.5 19.7
-SWBD 2 E. Chase 6.0 4.0 SWBD 3 18.7 19.7
-SWBD 3 E. Chase 8.2 4.0 SWBD 4 18.5 22.7 Battery 1 12.7 20.7 Battery 2 12.8 21.0
-Battery 2 notch 8.4 4.7 Battery 3 12.7 21.0
+Battery 3 S. Alcove 4.2 4.7
+Battery 3 N. Alcove 2.1 3.3 Battery 4 12.8 20.7 Corridor 1N 57.3 6.7 Corridor 1S 31.3 6.7
+Corridor 1S Alcove 4.3 6.4 Corridor 2 12.0 37.0 ESF 1 50.5 66.0
-ESF Elec. Chase 1 6.0 4.0
-ESF Elec. Chase 2 13.0 13.0 ESF 2 48.5 66.0
-ESF Duct Chase 12.9 4.7
-ESF Elec. Chase 1 6.0 4.0
-ESF Elec. Chase 2 13.0 13.0
-2000' SW Stairwell 15.3 25.0 Table 1: Room Parameters
+ means the volume is an addition to the parent room
- means the notch is removed from the parent room
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 6 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Rooms DC Load (watts)
SWBD 1&4 13811 SWBD 2&3 2928 Battery 1&4 301 Battery 2&3 161 ESF 1 28968 ESF 2 27988 Table 2: DC heat loads Air In Air Out Rooms (CFM) (CFM)
SWBD 1&4 2100 2100 SWBD 2&3 2000 2000 Battery 1&4 300 300 Battery 2&3 200 200 ESF A&B 6900 6900 Table 3: HVAC flowrates Door (nominal) W (ft) H (ft) 3'-8.5" 3.33 7.17 4'-4.5" 4.00 7.17 5'-4.5" 5.00 7.17 6'-8.5" 6.00 8.00 Table 4: Door parameters
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 7 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Figure 1 - 2016 Floor layout - Red lines indicate the split corridor flowpaths, Blue lines indicate the flowpaths that come into play when the doors are opened 5.0 CALCULATION 5.1 Areas Wall areas were calculated by multiplying the various length and width room parameters located in Table 1 by the room height. Areas of the floors and ceilings were found by multiplying the length and width parameters together directly. The areas of the small additional nooks and notches were added or subtracted as dictated by the floorplan, as were the areas of the doors in respect to the wall area. Due to the simple nature of the calculations, and the repetitive nature of then, only the results are shown in Table 5. The areas of the walls, floors, and ceilings were then added into the GOTHIC model as Thermal Conductors, with their thickness determined by their location and orientation, as discussed above.
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 8 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr For the floor area of Battery Room 1 Area = Width
- Length 2
Length = 12 ft 3
2 Width = 20 ft Equation 1 3
Area = 20 3
- 12 2 3 2
Area = 261.78 ft 2 Ceiling&Floor Walls Room (ft^2) (ft^2)
SWBD 1 423.11 1103.67 SWBD 2 339.83 1052.31 SWBD 3 334.44 1046.33 SWBD 4 419.33 1120.39 Battery 1 261.78 907.78 Battery 2 230.42 922.11 Battery 3 292.51 1097.65 Battery 4 265.22 912.56 Corridor 1N 382.22 1710.44 Corridor 1S 236.51 1220.72 Corridor 2 444.00 1137.11 ESF 1 3140.00 3243.67 ESF 2 2566.70 3186.33 Table 5 - Room Areas 5.2 Volumes The volumes of the rooms and corridors were calculated by multiplying the areas of the floors by the assumed height of the rooms (14 1/3 ft). This method was chosen due to the irregular nature of the 2016 room layouts. Floor areas were taken from Table 5, and the resulting volumes can be found in Table 6. These volumes were then added into the GOTHIC model as Control Volumes. The Hydraulic Diameters of the rooms are
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 9 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr calculated by taking four times the volume of the room and then dividing it by the surface area of the room.
Volume = Length
- Width
- Height 2
Length = 12 ft 3
2 Width = 20 ft 3 Equation 2 1
Height = 14 ft 3
Volume = 20 2 3
- 12 2 3
- 14 13 Volume = 3752.15 ft 3 Hyd.
Volume Diam.
Rooms ft^3 ft SWBD 1 6064.59 11.94 SWBD 2 4870.94 10.98 SWBD 3 4793.70 10.85 SWBD 4 6010.44 11.91 Battery 1 3752.15 10.15 Battery 2 3302.64 9.23 Battery 3 4192.69 9.69 Battery 4 3801.52 10.20 Corridor 1N 5478.52 8.75 Corridor 1S 3390.03 7.92 Corridor 2 6364.00 12.00 ESF 1 47773.00 19.86 ESF 2 45881.00 21.81 Table 6 - Room Volumes & Hydraulic Diameters 5.3 Flowpaths The area of each flowpath (Table 7) was found by multiplying the width and height of the opening. The dimensions of the doors were taken from Table 4, and the grill dimensions were taken from the HVAC drawings (as discussed in Section 4.0). Each flowpath was then divided into a top and a bottom half before being added into the GOTHIC model.
This is due to the fact that GOTHIC only allows flow to travel one way in a flowpath at a time. By dividing the flowpath into top and bottom halves, it allows GOTHIC to model
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 10 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr two-way flow through the opening. This allows it to properly model the buoyancy driven cooling flow through the rooms, with the hot air rising and flowing out the top half of the opening, and the cold air sinking and flowing in through the bottom half. Hydraulic Diameter is calculated as four times the area divided by the perimeter.
Hyd.
Width Height Area Area/2 Diam.
Flowpaths ft ft ft^2 ft^2 ft 3'-8.5" Door 3.33 7.17 23.89 11.94 4.55 4'-4.5" Door 4.00 7.17 28.67 14.33 5.13 5'-4.5" Door 2.50 7.17 17.92 8.96 3.71 6'-8.5" Door 6.00 8.00 48.00 24.00 6.86 Transfer Grill 0.83 0.83 0.69 0.35 0.83 Corridor 1 6.67 14.33 95.56 47.78 9.10 Corridor 2 12.00 14.33 172.00 86.00 13.06 Table 7 - Flowpath Dimensions & Hydraulic Diameters 6.0 IMPACT ASSESSMENT The analysis will potentially affect the PRA and EQ analysis of the equipment located in the 2016 Battery and SWBD rooms. The analysis of the margin available in these rooms is beyond the scope of this calculation.
The blocking opening of doors from these volumes into areas with no heat sources or inactive heat sources is allowable under this calculation, due to the fact that the additional airspace and heat sinks will assist in absorbing the heat from the modeled heat loads.
This will only serve to decrease the temperature of the Battery and SWBD rooms, thus increasing the margin available.
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 11 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr
7.0 CONCLUSION
Due to the number of different rooms and run conditions, only the limiting room temperatures will be given. The run results for the sensitivity analysis can be found in Table 8, with the limiting room temperature profiles in Figures 2-5. Additional cases of greater severity were run for the doors remaining closed with both one train and no trains of A/C, along with a run with the A/C disabled but the doors opened at one hour. The room temperatures for these runs can be found in Table 9.
The rooms with the working A/C systems show little heatup due to the large amount of airflow and the battery rooms have less than ten percent of the heat load of the SWBD rooms, so the limiting room temperatures in these models are always a SWBD room on the train with the failed A/C.
Due to the rapid decrease in the failed A/C room temperatures after the opening of the doorways, it is acceptable to interpolate the peak room temperatures for opening the doors between the modeled doors opening times.
Active Trains of HVAC Doors A B A B open HVAC HVAC HVAC HVAC at time ESFAS ESFAS Normal Normal 2 hr 130.676 126.964 122.267 119.139 4 hr 130.677 128.559 122.267 120.887 6 hr 130.677 130.65 122.268 122.562 8 hr 132.183 132.628 123.814 124.163 12 hr 135.578 136.307 126.778 127.142 Table 8 - Sensitivity Run results AC Doors 24 hr max (°F) 30 day max (°F)
None Open at 1hr 115.0 154.1 None Closed 145.7 191.9 A Train Closed 144.4 183.0 B Train Closed 145.3 185.1 Table 9 - Alternate Severe Parameter Run results
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 12 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr A Active ESFAS Loads 140 130 Two hour opening 120 Temp (F)
Four hour opening 110 Six hour opening Eight hour opening 100 Twelve hour opening 90 80 0 1000000 2000000 3000000 Time (seconds)
Figure 2a: Limiting room temperatures with A Train HVAC active and ESFAS loads A Active ESFAS Loads 140 130 Two hour opening 120 Temp (F)
Four hour opening 110 Six hour opening 100 Eight hour opening Twelve hour opening 90 80 1 100 10000 1000000 Log Time (seconds)
Figure 2b: Limiting temperatures (log scale time) with A Train HVAC and ESFAS loads
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 13 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr B Active ESFAS Loads 140 130 Two hour opening 120 Temp (F)
Four hour opening 110 Six hour opening Eight hour opening 100 Twelve hour opening 90 80 0 1000000 2000000 3000000 Time (seconds)
Figure 3a: Limiting room temperatures with B Train HVAC active and ESFAS loads B Active ESFAS Loads 140 130 Two hour opening 120 Temp (F)
Four hour opening 110 Six hour opening 100 Eight hour opening Twelve hour opening 90 80 1 100 10000 1000000 Log Time (seconds)
Figure 3b: Limiting temperatures (log scale time) with B Train HVAC and ESFAS loads
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 14 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr A Active Normal Loads 130 125 120 115 Two hour opening Temp (F) 110 Four hour opening 105 Six hour opening 100 Eight hour opening 95 Twelve hour opening 90 85 80 0 1000000 2000000 3000000 Time (seconds)
Figure 4a: Limiting room temperatures with A Train HVAC active and normal loads A Active Normal Loads 130 125 120 Two hour opening 115 Temp (F) 110 Four hour opening 105 Six hour opening 100 Eight hour opening 95 Twelve hour opening 90 85 80 1 100 10000 1000000 Log Time (seconds)
Figure 4b: Limiting temperatures (log scale time) with A Train HVAC and normal loads
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 15 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr B Active Normal Loads 130 125 120 115 Two hour opening Temp (F) 110 Four hour opening 105 Six hour opening 100 Eight hour opening 95 Twelve hour opening 90 85 80 0 1000000 2000000 3000000 Time (seconds)
Figure 5a: Limiting room temperatures with B Train HVAC active and normal loads B Active Normal Loads 130 125 120 Two hour opening 115 Temp (F) 110 Four hour opening 105 Six hour opening 100 Eight hour opening 95 Twelve hour opening 90 85 80 1 100 10000 1000000 Log Time (seconds)
Figure 5b: Limiting temperatures (log scale time) with B Train HVAC and normal loads
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 16 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr
8.0 REFERENCES
- 1. A-2325 Rev. 3, Control/Diesel Gen Bldg/Comm Corr - EL 2000 & 2016 Floor Plans
- 2. GK-10 Rev. 1, Switchboard Room Temperature Rise. Determine Action to be Taken to Maintain All DC Switchboard, Battery & ESF Switchgear Rooms Below 104 Deg F. When One 1E A/C Unit is Inoperable.
- 3. M-2H3311 Rev. 3, Heating Ventilating & Air Cond. - Control Building - EL 2000'-0" Area 1
- 4. M-2H3411 Rev. 4, Heating Ventilating & Air Cond. - Control Building - EL 2016-0 Area 1
- 5. A-2908 Rev. 24, Door Schedule
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 17 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr 9.0 ATTACHMENTS Attachment 1 - Excel file of GOTHIC outputs Attachment 2 - Zipped GOTHIC models Attachment 3 - GOTHIC Model Control Volumes
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 18 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Attachment 4 - GOTHIC Model Boundary Conditions Attachment 5a - GOTHIC Model Conductors, page 1
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 19 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Attachment 5b - GOTHIC Model Conductors, page 2 Attachment 6a - GOTHIC Model Heat Loads (ESFAS conditions)
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 20 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Attachment 6b - GOTHIC Model Heat Loads (Normal conditions)
Attachment 7a - GOTHIC Model Flowpaths page 1a
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 21 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Attachment 7b - GOTHIC Model Flowpaths page 1b Attachment 7c - GOTHIC Model Flowpaths page 2a
Ameren-UE CALCULATION SHEET Nuclear Engineering PAGE 22 OF 22 CALCULATION NO :
2016 Aux. Building Battery and SWBD room GOTHIC GK-19, Rev. 0 Add. 3 temperature analysis PREPARED BY: REVIEWED BY:
Kurt Linsenbardt Tom Carr Attachment 7d - GOTHIC Model Flowpaths page 2b
ATTACHMENT 7 USE OF GOTHIC 7.2a Page 1 of 3 Numerical Applications, Inc. (NAI) is the developer of the GOTHIC thermal hydraulics analysis code which has been used previously for Callaway containment pressure/temperature analyses and numerous other nuclear plant related analysis tasks.
(See the discussion of License Amendment 168 below.) GOTHIC is developed and maintained under NAIs QA Program that conforms to the requirements of 10CFR50 Appendix B and 10CFR Part 21. Detailed descriptions of available GOTHIC user options and models are included in References 1 and 2 below. Information about GOTHIC qualification is available in Reference 3. The Callaway engineers qualified to use GOTHIC document their proficiency via the Engineering Support Personnel (ESP) qualification card requirement titled ESP/504A, Perform Containment Pressure /
Temperature Calculation Using the GOTHIC Computer Code.
- 1. George, TL, et al., GOTHIC Containment Analysis Package User Manual, Version 7.2a(QA), NAI 8907-02, Rev. 17, Numerical Applications, Inc., Richland, WA, January 2006.
- 2. George, TL, et al., GOTHIC Containment Analysis Package Technical Manual, Version 7.2a(QA), NAI 8907-06, Rev. 16, Numerical Applications, Inc., Richland, WA, January 2006.
- 3. George, TL, et al., GOTHIC Containment Analysis Package Qualification Report, Version 7.2a(QA), NAI 8907-09, Rev. 9, Numerical Applications, Inc., Richland, WA, January 2006.
The following discussion of GOTHIC 7.2a was provided in ULNRC-05734 dated October 26, 2010:
GOTHIC 7.2a (Callaway 50.59 Evaluation Log No. 06-02)
GOTHIC 7.2a Software Documentation Package Activity
Description:
Current Containment/Main Steam Tunnel temperature/pressure analyses performed for FSAR Chapters 3.B and 6.2 were completed by Westinghouse using version 7.1pl of the GOTHIC code. However, future analyses will be performed by Callaway personnel on site, and GOTHIC version 7.1 p1 is no longer distributed by EPRI. GOTHIC version 7.2 replaced version 7.1 p1, but version 7.2a will be considered since most of the changes were corrections of errors from version 7.2. A software documentation package has been prepared to enable the use of GOTHIC version 7.2a per procedure EDP-ZZ-04011, "Nuclear Engineering Analytical Software Controls." This 10 CFR 50.59 Evaluation is being performed as part of the 10 CFR 50.59 review of the Software Documentation Package.
Page 2 of 3 Summary of Evaluation:
Evaluation question 8, "Does the proposed activity result in a departure from a method of evaluation described in the FSAR used in establishing the design bases or in the safety analyses?" is applicable to this change. GOTHIC 7.2a calculates some results that are conservative and some that are non-conservative with respect to results from version 7.1p1. A review of the change in these results indicates that the results are conservative or essentially the same as those from GOTHIC version 7.1 p1 and thus do not represent a departure from a method of evaluation described in the FSAR and do not require prior NRC approval. Other limitations on the use of GOTHIC remain consistent with NRC approval of the use of GOTHIC in previous applications. In addition, user-controlled enhancements which could impact the results in GOTHIC 7.2a will not be used for Callaway calculations.
The validation of GOTHIC 7.2a included the comparison of peak containment temperatures calculated for 3 LOCA cases and 3 MSLB cases approved by the NRC in LA168 using GOTHIC 7.1p1.
Summary of Changes in Peak Containment Temperatures from GOTHIC 7.1p1 to GOTHIC 7.2a MSLB Main MSLB Steam LOCA DEPSG LOCA DEPSG MSLB DER Split Break Tunnel (pump suction) (pump suction) LOCA DEHL 102% RTP 2% RTP 1.0 sq.ft.
MaxSI MinSI (hot leg) failed MSIV failed EDG one SI train Peak Temperature Change -0.22% -0.19% -0.18% -0.19% -0.18% 0.01%
The following is an excerpt approving GOTHIC 7.1p1 from the Safety Evaluation for Callaway License Amendment 168 dated September 29, 2005 (Callaway Plant, Unit 1 -
Issuance of Amendment Regarding the Steam Generator Replacement Project (TAC NO.
MC4437), ADAMS ACCESSION Numbers: ML052570054, Package ML052570086, TS ML052730083):
3.6.3.3 Application of GOTHIC to Callaway Containment Safety Analyses The GOTHIC code is a general purpose thermal hydraulics computer program for the analysis of a nuclear power plant containment. GOTHIC was developed for the Electric Power Research Institute (EPRI) by Numerical Applications, Incorporated (NAI). NAI validated GOTHIC by comparison with analytical solutions and experimental data. The NRC has previously approved containment analyses using the GOTHIC code. The licensee stated that it has used GOTHIC 7.1p1 for the containment analyses and these analyses are consistent with the conditions and limitations of a previous staff review of GOTHIC (Reference 6.3).
Page 3 of 3 In the following statement, the licensee described the quality assurance program used for the application of the GOTHIC code to Callaway.
The GOTHIC computer code for the Callaway RSG [replacement steam generator] Program was developed and implemented by Westinghouse in accordance with their Quality Assurance program. That invokes the requirements of 10 CFR 21 and 10 CFR 50 Appendix B. Westinghouse is currently listed on the AmerenUE Qualified Supplier List for Engineering Services.
Based on this quality control on the application of the GOTHIC code to Callaway, the NRC staff finds that the licensees use of GOTHIC in the Callaway containment analyses is acceptable.
8.0 REFERENCES
Section 3.6 of this SE:
6.1 Westinghouse LOCA Mass and Energy Release Model for Containment Design, WCAP- 10325-P-A, May 1983 (Proprietary), WCAP 10326-A (Non-Proprietary) March 1979.
6.2 GOTHIC Containment Analysis Package, Version 7.0, Electric Power Research Institute.
6.3 Issuance of Kewaunee Nuclear Power Plant License Amendment No. 169, September 29, 2003.