ML063280241
| ML063280241 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 10/05/2006 |
| From: | Block N, Harrell J, Pope M A Progress Energy Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| HNP-06-128 NAI-1282-001 | |
| Download: ML063280241 (358) | |
Text
Numerical Applications Inc. Page 1 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number:
NAI-1282-001 Rev. 0 I I Letter Report Number:
NAI-1282-001 Revision Number: 0 Title: GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris
Description:
The purpose of this calculation is to benchmark a GOTHIC model of the ChargingISafety Injection Pump Room 1 A-SA to a test performed on September 21, 2006 (Reference
[8]) and to apply this model to post-LOCA and normal operating conditions. The test started the CSlP pump without the 'A' train chiller operating, allowing the 1A-SA CSlP room to heat up. Once specific temperature criteria were reached, the door to the room was opened and a portable fan was placed in the doorway between the CSlP room and RAB. Using the benchmarked model, cases were run to determine the maximum CSlP room temperature for normal operation and post-LOCA conditions in which chilled water was not available to the air handling unit responsible for cooling this area. Author Date ' ' Nathan Block Scope of Review: The GOTHIC model described in the letter report, key inputs, assumptions, and results were prepared by Mr. Nathan Block and have been independently reviewed by Mr. Mark Pope. /O/S 106 Reviewer Date Mark Pope WAl Management Date Jim ~arreu Numerical Applications Inc. Page 2 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0 Table of Contents
1.0 INTRODUCTION
............................................................................................................................4 2.0
SUMMARY
OF RESULTS AND CONCLUSIONS.....................................................................4 3.0 CALCULATIONS FOR BENCHMARK MODEL.......................................................................4 3.1 DUCTWORK HEAT LOSS TO THE CCW AREA....................................................................................4 3.2 AH-9 FAN HEAT...............................................................................................................................5
3.3 THERMAL
MASS OF AH-9 COIL........................................................................................................5 3.4 FORCED CONVECTION......................................................................................................................5 3.5 HEAT TRANSFER THROUGH CSIP ROOM WALLS..............................................................................5
3.6 LIGHTING
HEAT LOADS....................................................................................................................5
3.7 PIPING
HEAT LOADS.........................................................................................................................6 3.8 STEEL..............................................................................................................................................6
3.9 MOTOR
MASS AND HEAT LOAD INPUT..............................................................................................6 3.10 DUCTWORK FLOW AREAS................................................................................................................6 3.11 INDUCTION MOTOR AREAS...............................................................................................................6 3.12 FAN RECIRCULATION.......................................................................................................................7
4.0 BENCHMARK
INPUTS..................................................................................................................7
5.0 BENCHMARK
RESULTS............................................................................................................11
6.0 CHANGES
TO TEST BENCHMARK MODEL FOR NORMAL OPERATIONS MODEL.18
7.0 NORMAL
OPERATIONS INPUTS.............................................................................................18
8.0 NORMAL
OPERATIONS RESULTS..........................................................................................19
9.0 CHANGES
TO TEST BENCHMARK MODEL FOR POST-LOCA DESIGN MODEL.......21 10.0 POST-LOCA INPUTS...................................................................................................................21 11.0 POST-LOCA RESULTS................................................................................................................24
12.0 REFERENCES
...............................................................................................................................26 13.0 GOTHIC ANALYSIS FILES........................................................................................................28
Numerical Applications Inc. Page 6 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0
3.7 Piping
heat loads Piping heat loads in the original analysis (Reference [1]) are assumed to be invariant and are added with a heater component. In reality, however, a pipe with fluid at 150ºF will transfer no heat to a room that is at 150ºF. This effect is credited by making the piping heat loads a function of the room and fluid temperature. As the room temperature increases, the piping heat loads are decreased.
3.8 Steel
For long-term (i.e., 30 day) room heatup analyses, steel in a room does not substantially affect the maximum temperature since a steady-state temperature is usually reached prior to the full duration of the event. The steel simply heats up to the same temperature as the room and provides no benefit for the long-term room temperature. However, for shorter duration events, the thermal inertia of the steel can moderate the temperature of the room, resulting in substantially lower short-term and somewhat lower long-term temperatures.
For the previous analysis, steel conductors were not credited. However, in order to make the model as representative of the room as possible, they are added here. This will allow the model to provide a better prediction of the CSIP room temperature response, particularly during the beginning of the event. Based on a walkdown, steel supports and plates are present throughout the room. Additionally, the pump, speed increaser, and motor also sit on supports and a skid that have substantial thermal mass. Finally, steel plates are embedded in the wall surrounding the room. These steel masses are added to the model to provide the best representation of the CSIP room. 3.9 Motor mass and heat load input The substantial mass of the motor was also neglected for conservatism in the previous analysis. To model the motor, a thermal conductor made of steel with a thickness of 0.25 inches was conservatively utilized. The surface area is set such that the total metal mass of the motor (as given by Reference [4]) is conserved. The motor heat load utilized is then applied as a volumetric heat source in this thin conductor. This allows the appropriate heat load to be applied to the room, but moderates how much energy actually reaches the air space at the beginning of the event. This is consistent with the physical situation in which a cold motor is started and a portion of its heat load is applied to raising the temperature of the motor.
3.10 Ductwork flow areas In the original analysis, assumed flow areas of 1 f t 2 were utilized for the AH-9 inlet and outlet as well as the RABEES vents. Since forced convection was not activated for this problem, such an assumption did not substantially affect the results. However, since forced convection is credited in this analysis, these areas must be representative of the actual duct sizes. For the benchmark, these flow areas, and their hydraulic diameters, are updated based on walkdown notes and HVAC drawings.
3.11 Induction motor areas A flow area of 2 ft 2 was assumed for the induction motor inlet. Based on the walkdown, a flow area of 4 ft 2 is more appropriate. The walkdown showed a circular induction area with a diameter of 33 inches which was about 70% open. This yields a flow area of approximately 4 ft
- 2.
Numerical Applications Inc. Page 7 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0 3.12 Fan recirculation The benchmark fan flows and temperatures from Reference [8] indicate that some of the air leaving the top of the door and the normal HVAC inlet is recirculated back into the room by the door fan. Using the steady-state fan flow from 11:25 am during the test, the door fan inlet flow and temperature are 3600 cfm and 71.4°F, respectively. Meanwhile, air flow is leaving the upper section of the door of the CSIP room at a flow rate of 2500 cfm and temperature of 73.7°F, while the corresponding values for air exiting the CSIP room through the normal HVAC inlet are 444 cfm and 75.2°F. This gives an average weighted temperature of air leaving the CSIP room of 73.926°F while the RAB hallway temperature is 70.9°F. Thus, using known and calculated temperatures allows for the determination of the approximate percentage of the inlet flow that is recirculated back from the room.
()()()F X F X F926.739.70 14.71+-= Solving yields a recirculation, X, of 17%. This value is used with control variables to account for this affect in the benchmark and any cases where the door fan is utilized.
4.0 Benchmark
Inputs Input Value Source / Notes Ventilation System Flow Rates (normal) Air Handling Unit AH-9 (cfm) 6777 Reference [8] Normal HVAC Flow (cfm) 648 Reference [8] Normal Ventilation System Flow Rates (fan in door) Normal HVAC Flow (cfm) 648 Conservatively assumed same as door closed flow Fan flow (cfm) 3600 Reference [14]
Motor Power Calculation Leg Amperages 44, 46, 44 Reference [8] Leg Voltages 7000, 7000, 7000 Reference [8] Vendor Nominal Power Factor 0.9189 Reference [4] Power Factor 0.8775 Reference [16] Input Motor Power (hp) 637.28 Calculated by P=SQRT(3) x V x I x P.F. Pump Flow Rate (gpm) 175 Reference [8] Pump Power (hp) 620 Reference [9] @ CSIP flow of 175 gpm Speed Increaser Service Water Flow (gpm) 19.8 Reference [17] Speed Increaser Service Water Inlet and Outlet Temperatures (°F) 82.2, 84.9 Reference [17] Speed Increaser Energy Removed by Service Water (hp) 10.482 19.8 gpm x 0.13368 ft3/gal x 62.2 lbm/ft3 x (84.9-82.2)F Inefficiency Heat to Room (hp) 6.798 Heat = Pmotor - Ppump - Psw 637.28-620-10.482 Actual Heat to Room (BTU/sec) 5.063 Heat to room was Numerical Applications Inc. Page 8 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0 Input Value Source / Notes conservatively increased by 5+% to have the model reasonably match the benchmark data from Reference [8]
Heat Loads Charging Pump Motor (BTU/hr) 18227 5.063 Btu/sec x 3600 sec/hr Room Lights (BTU/hr) 6120 680 BTU/hr / light x 9 lights Heat Loss from Room Piping (BTU/hr) 2663 When room is at 104F based on Reference [13] AH-9 Motor Heat Load (hp) 6.42 Reference [18] Door Fan (hp) 3 Reference [17] Induction Motor Flows Upper Motor Exhaust North (cfm) 412 Reference [8] and flow area assumed restricted ~50% based on walkdown Upper Motor Exhaust South (cfm) 436 Reference [8] and flow area assumed restricted ~50% based on walkdown Lower Motor Exhaust South (cfm) 975 Reference [8] and flow area assumed restricted ~50% based on walkdown Lower Motor Exhaust North (cfm) 850 Reference [8] and flow area assumed restricted ~50% based on walkdown The walls, floor, and ceiling of the CSIP room are subject to fluctuating temperatures based on ambient temperatures and plant operations. In order to determine a representative conductor temperature for each location in the room, surface and air temperatures were measured at different intervals prior to the commencement of the test. Using these values, a weighted surface temperature is calculated according to the following assumed equation:
10 4 3 2 4 3 2 1 T T T T T+++= The subscripts for each of the temperatures represent the chronological order in which the temperatures are measured with '4' being the initial conditions just prior to commencement of the test. With these temperatures, an average conductor temperature is calculated based on the surface temperatures of each of the conductors.
Input Value Source / Notes Initial Conductor Temperatures Pump Room Floor (°F) 81.7 Reference [8] Pump Room Ceiling (°F) 82.6 Reference [8] Pump Room N. Wall (°F) 83.1 Reference [8] Pump Room S. Wall/Valve Gallery N. Wall (°F) 81.6 Reference [8]
Numerical Applications Inc. Page 9 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0 Input Value Source / Notes Pump Room E. Wall (°F) 79.5 Reference [8] Pump Room W. Wall (°F) 81.2 Reference [8] Southwest Corner Room Floor (°F) 80.5 Reference [8] Southwest Corner Room Ceiling (°F) 81.8 Reference [8] Southwest Corner Room W Wall (°F) 81.2 Reference [8] Southwest Corner Room S. Wall (°F) 80.9 Reference [8] Gallery Floor (°F) 80.5 Reference [8] Gallery Ceiling (°F) 81.8 Reference [8] Gallery S. Wall (°F) 80.9 Reference [8] AH-9 Ductwork (°F) 76.4 Reference [8] (Backside Ceiling Temperature) AH-9 Coil (°F) 76.4 Reference [8] (Backside Ceiling Temperature) Service Water Inlet/Outlet (°F) 63 Reference [8] (Initial Conditions) Gallery Room Wall Plates (°F) 80.9 Assumed same as Gallery South Wall Southwest Corner Room Wall Plates (°F) 81.2 Assumed same as S.W. Corner Room West Wall Pump Room Wall Plates (°F) 79.5 Assumed same as Pump Room East Wall Motor Mass (°F) 82.4 Reference [8] Motor Support (°F) 82.4 Assumed same as motor mass Pump Skid (°F) 80.6 Reference [8] Pump Support (°F) 80.6 Reference [8] Speed Increaser (°F) 79 Assumed same as South Skid Temperature (Reference [8]) Miscellaneous Steel Groups (°F) 79.6 Average of all measured room temperatures in Pump Room. Initial Conditions Pump Room Temperature (°F) 79.6 Average of all measured temperatures in Pump Room Pump Room Relative Humidity (%)
33 Average of all measured relative humidities in Pump Room. Valve Gallery (°F) 78 Average of all measured temperatures in Valve Gallery Valve Gallery Relative Humidity (%)
36.3 Average of all measured relative humidities in Valve Gallery Southwest Corner Room (°F) 77.1 Average of all measured temperatures in S.W. Corner Room Southwest Corner Room Relative Humidity (%)
36.3 Average of all measured relative humidities in S.W. Corner Room AH-9 Coil r.h. (%)
100 Based on recommendation of Reference [5] if pool is Numerical Applications Inc. Page 10 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0 Input Value Source / Notes present with vapor space AH-9 Coil Liquid Volume Fraction 0.9 A vapor space is allowed in the volume such that the pressures do not rise dramatically as the fluid is heated. A volume fraction of 0.9 yields a water volume of 9 gallons based on the size of the volume.
Door openings that occurred during the test were documented and added to the model. Based on the door opening log from the test, the following table gives the time and duration of the known door openings that occurred.
Clock Time Open Duration (sec) 8:00 4 8:02 10 9:15 3 9:18 9 9:23 8 10:25 7 10:28 9 10:31 (duration of test)
Insulated ductwork for the AH-9 is modeled to allow heat to be transferred in or out of the room depending on the relative temperatures between the CSIP room and RAB.
Input Value Source / Notes Ductwork Areas Vertical Ductwork Surface Area (ft2) 193.33 Reference [10] Horizontal Facing Upward Ductwork Surface Area (ft2) 105.6 Reference [10] Horizontal Facing Downward Ductwork Surface Area (ft2) 105.6 Reference [10] Service Water Piping 1-1/2" Supply Piping Length (ft) 20.93 Reference [11] 1-1/2" Return Piping Length (ft) 9.51 Reference [11] Steel Conductors 1" Pump Room Wall Plates (ft2) 53.33 Reference [19] 1" Southwest Corner Room Wall Plates (ft2) 26.67 Reference [19] 1" Valve Gallery Wall Plates (ft2) 26.67 Reference [19] 1/4" Pump Skid Plate (ft2) 78.47 Reference [19] 1/2" Pump Support (ft2) 30.95 Reference [19] 1/2" Speed Increaser Support (ft2) 8.47 Reference [19] 1-1/2" Speed Increaser Support (ft2) 2.62 Reference [19] 1/2" Motor Support (ft2) 12.09 Reference [19] 1-1/2" Motor Support (ft2) 4.47 Reference [19]
Numerical Applications Inc. Page 11 of 358 GOTHIC Charging Pump Room Heatup Analysis for Shearon Harris Letter Report Number: NAI-1282-001 Rev. 0 Input Value Source / Notes 3/16" Steel (ft2) 78.2 Walkdown 1" Steel (ft2) 5 Walkdown
5.0 Benchmark
Results The following figures document the accuracy with which GOTHIC is predicting the temperatures obtained during the performance of procedure OPT-9001T (Reference [8]). The measured, experimental data is given by the data points while the continuous lines are GOTHIC's predicted profiles. As documented in Reference [8], a letter designation of 'a' indicates that the measurement was taken 3 feet above the floor while a designation of 'b' indicates it was taken 7 feet above the floor. The exception to this are the motor inlet temperatures (locations 51 and 52) that are measured at 1/4 and 3/4 of the height of the motor fan intake for 'a' and 'b', respectively. Figure 1 identifies the physical locations in the room where the presented data is collected. The representative figures provided below verify that GOTHIC predicts either an accurate or conservatively high temperature for these locations. In these figures, the "+" and "*" represent the measured "a" and "b" test data points respectively. Considering the accuracy of the test instrumentation and the coarseness of the GOTHIC noding, these figures verify that the GOTHIC model has been appropriately benchmarked to the test.