ML12006A134
| ML12006A134 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/17/2011 |
| From: | Venigalla V AREVA, Calvert Cliffs, Constellation Energy Nuclear Group, Transnuclear |
| To: | Office of Nuclear Material Safety and Safeguards |
| References | |
| NUH32PHB-0408, Rev. 0 | |
| Download: ML12006A134 (30) | |
Text
ENCLOSURE4 TN Calculation NUH32PHB-0408, Thermal Analysis of NUHOMS 32PHB DSC for Vacuum Drying Operations Calvert Cliffs Nuclear Power Plant, LLC December 8, 2011
A Form 3.2-1 Calculation No.:
NUH32PHB-0408 AR EVA Calculation Cover Sheet Revision No.:
I TRANSNUCLEAR INC.
TIP 3.2 (Revision 4)
Page: 1 of 29 DCR NO (if applicable): NUH32PHB-010 PROJECT NAME: NUHOMS032PHB System PROJECT NO: 10955 CLIENT: CENG-Calvert Cliff Nuclear Power Plant Inc. (CCNPP)
CALCULATION TITLE:
Thermal Analysis of NUHOMS 32PHB DSC for Vacuum Drying Operations
SUMMARY
DESCRIPTION:
i) Calculation Summary This calculation evaluates vacuum drying operations for 32PHB DSC with heat loads of 29.6 kW, 25.6 kW and 23.04 kW and with blowdown gases of helium or nitrogen,
- 2) Storage Media Description Secure network server initially, then redundant tape backup If original issue, is licensing review per TIP 3.5 required?
Yes F-l No Z (explain below)
Licensing Review No.:
This calculation is performed to support a site specific license application by CCNPP that will be reviewed and approved by the NRC. Therefore, a 10CFR72.48 licensing review per TIP 3.5 is not applicable.
Software Utilized (subject to test requirements of TIP 3.3):
Version:
ANSYS 10.0 Calculation is complete:
Originator Name and Signature: Venkata Venigalla Date:
/7!
Calculation has been checked for consistency, con'ipleteness and correctness:
Checker Name and Signature: Davy Qi Date:
.*/1'12 6 1 Calculation is approved for use:
Project Engineer Name and Signature:
Date:
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2 of 29 REVISION
SUMMARY
AFFECTED AFFECTED DESCRIPTION PAGES Computational 1/O Initial Issue All All To provide additional time limits for vacuum drying using 1-5, 7, 11-See Section nitrogen at which the fuel cladding temperature remains below 13, 15, 16, 8.0 the maximum temperature attained during steady-state transfer 24-26, 28 operations with helium and water in the TC/DSC annulus.
and 29
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3 of 29 TABLE OF CONTENTS Paqe 1.0 P u rp o s e.............................................................................................................................
6 2.0 R e fe re n ce s........................................................................................................................
7 3.0 Assum ptions and Conservatism....................................................................................
8 4.0 D e s ig n In p u t......................................................................................................................
9 4.1 Design Criteria....................................................................................................
9 4.2 Therm al Properties of Materials...........................................................................
9 4.3 Vacuum Drying Operations...............................................................................
10 5.0 M e th o d o lo g y..................................................................................................................
12 6.0 R e s u lts............................................................................................................................
1 5 7.0 C o n c lu s io n......................................................................................................................
2 7 8.0 Listing of Com puter Files..........................................................................................
29
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4 of 29 LIST OF TABLES Paqe Table 4-1 Maximum Fuel Cladding Temperature Limit for Vacuum Drying Thermal A na lysis..................................................................................................
..... 9 Table 4-2 Thermal Properties of Homogenized Fuel Assembly in Nitrogen [5]............. 10 Table 5-1 Heat Generation Rates for 32PHB DSC......................................................
12 Table 6-1 Maximum Temperature Histories of Fuel Cladding for 32PHB DSC Vacuum Drying O perations...........................................................................
15 Table 6-2 Maximum 32PHB DSC Component Temperatures......................................
16 Table 6-3 32PHB DSC Component Average Temperatures (Hottest/Whole DSC S e ctio n )......................................................................................................
.. 17 Table 7-1 Maximum Fuel Cladding Temperatures for Vacuum Drying.........................
27 Table 7-2 Maximum Basket Component Temperatures...............................................
27 Table 7-3 Time Limits for Vacuum Drying Operations.................................................
28 Table 8-1 Sum m ary of ANSYS Runs...........................................................................
29 Table 8-2 Associated Files and M acros.........................................................................
29 Table 8-3 List of Spreadsheet.......................................................................................
29
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LIST OF FIGURES Figure 5-1 Figure 6-1 Figure 6-2 Figure 6-3 Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7 Figure 6-8 Figure 6-9 Page Typical Boundary Condition and Heat Generation for Vacuum Drying Operations (Shown for 29.6 kW / DSC)........................................................
14 Temperature Plots for 32PHB DSC (Vacuum Drying in Nitrogen, 29.6 kW
@ 32 H o urs)...............................................................................................
.. 18 Temperature Plots for 32PHB DSC (Vacuum Drying in Nitrogen, 25.6 kW
@ 4 0 H o u rs)...............................................................................................
.. 19 Temperature Plots for 32PHB DSC (Vacuum Drying in Nitrogen, 23.04 kW @ 56 H ours)..................................................
20 Temperature Plots for 32PHB DSC (Steady-State Vacuum Drying in H elium @ 29.6 kVv)...................................................................................
2 1 Temperature Plots for 32PHB DSC (Steady-State Vacuum Drying in H elium @ 25.6 kW )...................................................................................
22 Temperature Plots for 32PHB DSC (Steady-State Vacuum Drying in H elium @ 23.04 kW ).............................................
23 Maximum Temperature History of Fuel Cladding for Vacuum Drying O perations @ 29.6 kW.................................................................................
24 Maximum Temperature History of Fuel Cladding for Vacuum Drying O perations @ 25.6 kW.................................................................................
25 Maximum Temperature History of Fuel Cladding for Vacuum Drying O perations @ 23.04 kW...............................................................................
26
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6 of 29 1.0 PURPOSE This calculation presents the thermal analysis of the 32PHB DSC with heat loads of 29.6 kW, 25.6 kW and 23.04 kW during vacuum drying operations. These heat loads are determined based on the transfer cask analysis for various transfer time limits in [4, 8].
Helium or nitrogen gas can be used for removal of water from 32PHB DSC cavity (blowdown) before the start of vacuum drying. Subsequent vacuum drying occurs with a helium or nitrogen environment in the DSC cavity.
If helium is used for drainage of water from DSC and water is maintained in the annulus between the DSC and TC, there is no time limit for completion of the vacuum drying process.
This is because the DSC shell temperature is maintained at temperatures lower than the values calculated for the storage conditions [3]. The maximum fuel cladding temperatures with helium gas during vacuum drying operations (includes helium gas for water blowdown, vacuum drying and helium backfill) are determined using steady-state runs with boundary conditions discussed in Section 3.0. This calculation demonstrates that the steady-state, maximum fuel cladding temperatures remain below the allowable limit of 7520F established in ISG-1 1, Rev.3 [1].
If nitrogen is used for drainage of water during blowdown, time limits are imposed to ensure that the requirements described in ISG-1 1, Rev.3 [1] are satisfied. The time limits for vacuum drying operations using nitrogen for blowdown are determined for different heat loads using transient analyses.
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2.0 REFERENCES
1 NRC Spent Fuel Project Office, Interim Staff Guidance, ISG-1 1, Rev 3, "Cladding Considerations for the Transportation and Storage of Spent Fuel".
2 Design Criteria Document, "Design Criteria Document (DCD) for the NUHOMS 32PHB System for Storage", Transnuclear, Inc., Document No. NUH32PHB.0101, Rev. 2.
3 Calculation, "Thermal Evaluation of NUHOMS 32PHB DSC for Storage and Transfer Conditions", Transnuclear, Inc., Calculation No. NUH32PHB-0403, Rev. 0.
4 Calculation, "Thermal Evaluation of NUHOMS 32PHB Transfer Cask for Normal, Off-Normal, and Accident Conditions", Transnuclear, Inc., Calculation No. NUH32PHB-0402, Rev. 0.
5 Calculation, "Fuel Effective Thermal Properties for 32PHB DSC Design", Transnuclear, Inc., Calculation No. NUH32PHB-0407, Rev. 0.
6 Rohsenow, Hartnett, Cho, "Handbook of Heat Transfer", 3 rd Edition, 1998.
7 ANSYS computer code and On-Line User's Manuals, Version 10.0.
8 Calculation, "Thermal Evaluation of NUHOMS 32PHB Transfer Cask for Normal, Off Normal, and Accident Conditions (Transient with <29.6 kW)", Transnuclear, Inc.,
Calculation No. NUH32PHB-0406, Rev. 1.
9 Calculation, "Effective Fuel Properties for Vacuum Drying", Transnuclear, Inc.,
Calculation No. 1095-38, Rev. 0.
10 UFSAR, "Updated Final Safety Analysis Report for the NUHOMS HD Horizontal Modular Storage System for Irradiated Nuclear Fuel", Transnuclear, Inc., NRC Docket No. 72-1030, Revision 2.
11 Calvert Cliffs Independent Spent Fuel Storage Installation Updated Safety Analysis Report, Rev. 17.
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8 of 29 3.0 ASSUMPTIONS AND CONSERVATISM The assumptions and conservatism considered for 32PHB DSC model are the same as listed in
[3] with additional assumptions noted below.
During vacuum drying operations the annulus is open to atmospheric pressure and the water in the transfer caskIDSC annulus is monitored and replenished. Therefore, no water boiling occurs within the transfer caskIDSC annulus. The DSC shell temperature is assumed to be the boiling temperature of water (212 0 F) for vacuum drying thermal analyses. This assumption is justified in
[4], Appendix C.
The vacuum drying of the DSC is assumed not to reduce the pressure sufficiently to decrease the thermal conductivity of the gases within the DSC cavity. This assumption is justified in [9] for air at low pressures, which remains valid for nitrogen and helium.
Vacuum drying operations are assumed to start with blowdown of water from DSC cavity. It is also assumed that the active fuel length is covered with water before the start of vacuum drying operations.
An average initial temperature of 212°F is considered for the 32PHB DSC components at the start of vacuum drying operation. Based on analysis of heat up rate for a DSC and basket type similar to 32PHB design in [10], Section 4.5.1, a heat up rate of 3.21F per hour is expected for a decay heat load of 34.8 kW. Assuming a conservative heat up rate of 4.0°F per hour for 32PHB DSC with 29.6 kW heat load and 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> period for operations (such as lifting and welding) prior to vacuum drying, the average temperature of the 32PHB DSC before starting of the vacuum drying operation is:
Initial average temperature
= maximum pool temperature + average heat up rate x duration of operations prior to vacuum drying Where Maximum pool temperature
= 140'F [2],
Average heat up rate
= 4.0°F/hr, Duration of operations prior to vacuum drying = 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> (assumed).
Initial average temperature = 140 + 4.0 x 12 =1880 F.
Based on the above evaluation, assuming an initial temperature of 212°F for DSC prior to vacuum drying operation is conservative.
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9of29 4.0 DESIGN INPUT The design inputs considered for 32PHB DSC thermal model in [3] are applicable for this calculation.
4.1 Design Criteria Maximum fuel cladding temperature limit is in accordance with ISG-1 1, Rev.3 [1], listed in [2]
and shown in Table 4-1.
Table 4-1 Maximum Fuel Cladding Temperature Limit for Vacuum Drying Thermal Analysis I
Operating Condition IAmbient Temperature/°F)
Fuel Cladding Limit (°F)
Vacuum Drying (1)
DSC in Vertical TC (with (2) water in DSC/TC annulus) 100 752 [1]
Notes: (1) Vacuum drying operations within fuel building including water blowdown and helium backfill with the DSC located in the TC in vertical orientation are considered normal conditions.
(2) Average ambient temperature within the fuel building [2].
Based on [1], repeated thermal cycling (repeated heatup/cooldown cycles) shall be limited to less than 10 cycles during loading operations, with cladding temperature variations that are less than 65°C (1 17'F) each. Backfilling the DSC with helium gas causes a one time temperature drop, which is not considered as a repeated thermal cycling. Re-evacuation of the DSC under helium atmosphere does not reduce the pressure sufficiently to decrease the thermal conductivity of helium. Therefore, re-evacuation and re-pressurizing the DSC under helium atmosphere proceed on a descending curve to the minimum steady state temperatures, and does not include any thermal cycling. It is concluded that the limit of 650C (1 17*F) considered for thermal cycling during loading operations is not applicable for NUHOMSO-32PHB system.
4.2 Thermal Properties of Materials Material properties used in 32PHB DSC thermal model for vacuum drying operations are the same as those used in [3] except for nitrogen used during water blowdown and vacuum drying processes. If nitrogen is used for water blowdown and vacuum drying processes the thermal properties for the homogenized fuel assembly in nitrogen, calculated in [5] are used and are listed in Table 4-2.
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10 of 29 Table 4-2 Thermal Properties of Homogenized Fuel Assembly in Nitrogen [5]
Temperature Transverse Axial Densit Specific Heat (OF)
Conductivity Conductivity (ibm/iny)
(Btu/Ibm-f F)
(Btu/hr-in-OF)
(Btu/hr-in-°F) 189 0.0083 271 0.0104 356 0.0131 445 0.0164 536 0.0205 0.0601 0.1308 0.0576 629 0.0253 724 0.0310 820 0.0375 916 0.0448 1014 0.0530 4.3 Vacuum Drying Operations This section presents a brief description of the various steps and defines the time limit applicable for each step based on the operations described in Section 5.1.1.3 and 5.1.1.4 of the CCNPP ISFSI UFSAR [11]. A flow chart of the various operations during the DSC loading is shown in [11], Figure 5.1-1. The steps described below are applicable for vacuum drying with both helium and nitrogen blowdown. However, the time limits presented in this calculation are applicable only for vacuum drying with nitrogen blowdown.
The following are the steps of the vacuum drying process for which a time limit is defined. These steps occur after the top shield plug of the DSC is seal welded and a nondestructive examination (NDE) is performed. It is assumed that active fuel length remains covered with water during welding and NDE.
- a.
Remaining water from the DSC cavity is removed by engaging the compressed helium or compressed nitrogen gas source.
- b.
When water stops flowing from the DSC, the vacuum pump is started and a vacuum of 3 torr or less is drawn in the DSC cavity.
- c.
The DSC internal pressure is stabilized at 3 torr or less.
- d.
The valve in the helium inlet is opened to allow helium to flow into the DSC.
- e.
The DSC is pressurized with helium to 22 psia and the shield plug seal weld tested for leakage. After the seal welds' integrity is confirmed, the DSC is re-evacuated to 3 torr and backfilled with helium to a cavity pressure of 17.2 psia.
- f.
The vacuum drying system (VDS) is disconnected from the DSC and the prefabricated plugs are seal welded over the DSC vent and siphon port openings. The top cover plate is placed over the shield plug. After proper fit-up between the plate and the DSC shell is verified, the top cover plate is tack welded to the shell using the automatic welding
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11 of 29 machine. The cover plate final closure weld is placed. The automatic welding machine is removed from the DSC.
- g.
The cask drain port valve is opened and the remaining water is removed from the cask/DSC annulus.
For vacuum drying operations with nitrogen blowdown three time limits are specified below:
- 1)
Time limit "TI" is defined as the maximum allowed time from the initiation of Step "a" to initiation of Step "d".
- 2)
Time limit "T2" is defined as the minimum allowed time from the initiation of Step "d" to initiation of Step "g".
- 3)
Time limit "T3" is defined as the maximum allowed time from the initiation of Step "a" to initiation of Step "d" within which if the vacuum drying operations i.e. initiation of Step "a" to initiation of Step "d" are completed, the time limit "T2" is not applicable.
If the vacuum drying operations i.e. initiation of Step "a" to initiation of Step "d" cannot be completed within the time limit "T3", time limits "TI" and "T2" remain applicable.
The first time limit "TI" is the maximum allowed time limit for the DSC using nitrogen blowdown to ensure that the maximum fuel cladding temperature is within the acceptable limits of 7520F during vacuum drying.
The second time limit "T2" is the minimum required time limit for the DSC with helium backfill to ensure that the maximum fuel cladding and DSC components temperatures cool down sufficiently to the initial conditions used in the transfer cask thermal analysis presented in [4, 8].
The third time limit "T3" is the maximum allowed time limit for the DSC using nitrogen blowdown to ensure that the maximum fuel cladding temperature and DSC component temperatures remain below the initial conditions used in the transfer cask thermal analysis presented in [4, 8].
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12of29 5.0 METHODOLOGY The ANSYS finite element model and thermal analysis methodology for the 32PHB DSC are described in [3], and are used in this calculation for the thermal analysis of the 32PHB DSC for vacuum drying operations.
For the maximum decay heat load of 29.6 kW per 32PHB DSC, the heat load zone configuration is the same as that shown in [3], Figure 5-5.
For decay heat loads of 25.6 kW and 23.04 kW per 32PHB DSC [8], a uniform heat load of 0.8 kW and 0.72 kW per fuel assembly (FA), respectively is considered for the 32 FAs in the DSC.
The peaking factors (PFs) for 32PHB FAs as listed in [3], Table 5-10 are considered in this calculation.
The heat generation rates are calculated using Equation (5.1) from [3], and are listed in Table 5-1.
Table 5-1 Heat Generation Rates for 32PHB DSC Heat Generation Rate Decay Heat Load per DSC Heat Load per Assembly (Btu/hr-in 3)
(kW)
(kW)
PF=1.0 PF=1.101 (Base)
(Maximum) 1.0 0.345 0.380 29.6 0.8 0.276 0.304 25.6 0.8 0.276 0.304 23.04 0.72 0.249 0.274 The boundary conditions are uniform temperature of 212'F at the DSC shell as discussed in Section 3.0 and volumetric heat generation load in fuel region. Figure 5-1 shows typical boundary condition and heat generation load.
A transient run for the vacuum drying operations includes two steps:
- 1) To determine the maximum time limit 7T1" for vacuum drying operations in nitrogen such that the maximum fuel cladding temperature is below fuel cladding limit of 7520F specified in Section 4.3.
- 2) Helium is used to backfill the DSC cavity after the end of vacuum drying operations in nitrogen. This transient run determines the minimum time limit "T2" with helium in the DSC cavity to allow the DSC/Basket component temperatures to cool down sufficiently to the initial conditions used in the transfer cask thermal analysis presented in [4, 8].
The maximum time limit "T3" i.e, the time limit at which the maximum fuel cladding temperature remains below the initial conditions used in the transfer cask thermal analysis presented in [4, 8]
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13of29 is determined via interpolation of the maximum fuel cladding temperature response during the heat up phase in nitrogen atmosphere. The time limit "T3" calculations are captured in excel spreadsheet "32PHB_VDY_R-1.xls" listed in Table 8-3.
As noted in Section 1.0, the time limit "TI" is not applicable when using helium for water blowdown during vacuum drying operations.
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14of29 ANSYS 10.OA1 HGEN PATES UVAIN=.044223 x=. 380389
.044223
.081575
.118927
.156279
.19363
.230982 m
.268334
.305686
.343037
.380389 Figure 5-1 Typical Boundary Condition and Heat Generation for Vacuum Drying Operations (Shown for 29.6 kW / DSC)
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15 of 29 6.0 RESULTS The maximum temperature histories of fuel cladding for 32PHB DSC vacuum drying operations are listed in Table 6-1.
Table 6-1 Maximum Temperature Histories of Fuel Cladding for 32PHB DSC Vacuum Drying Operations Operating 29.6 kW 25.6 kW 23.04 kW Condition Time Fuel Cladding Time Fuel Time Fuel Cladding Cladding (Hr)
Tmax (Hr)
Tmax (Hr)
Tmax (OF)
(OF)
(OF)
Blowdown Gas Helium Nitroge Nitrogen n
8 279 299 8
262 8 29 Water Blowdown 16 437 490 16 447 16 412
& Vacuum Drying 24 521 621 24 573 24 530 32 560 711 32 656 32 610 40 709 40 662 48 696 56 718 40 578 667 48 646 60 670 48 586 630 56 601 64 626 56 589 610 64 577 72 564 64 591 600 72 562 80 538 72 591 595 90 556 86 530 80 591 593 90 528 Steady-State with 592 592 555 524 Helium Backfill Maximum Time Limit in Nitrogen (For water blwonadN/A 32 40 56 blowdown and vacuum drying),
"Ti" (Hrs)
Minimum Time Limit in Helium N/A 32 32 30
- Backfill, "T2" (Hrs)
Maximum Time Limit in Nitrogen N/A 22 23 24
- Backfill, "T3" (Hrs)
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16 of 29 Table 6-1 lists the maximum time limit, "TI" for water blowdown and vacuum drying in nitrogen and the minimum time limit, "T2" with helium in the DSC cavity to allow the DSC/Basket component temperatures to cool down sufficiently to the initial conditions used in the transfer cask thermal analysis presented in [4, 8].
The third time limit "T3" which is the maximum allowed time limit for the DSC using nitrogen blowdown to ensure that the maximum fuel cladding temperature and DSC component temperatures remain below the initial conditions used in the transfer cask thermal analysis presented in [4, 8] are also listed in Table 6-1.
If the vacuum drying operations i.e. initiation of Step "a" to initiation of Step "d" described in Section 4.3
" are completed within the time limit "T3", the time limit "T2" is not applicable or
" cannot be completed within the time limit "T3", the time limits "TI" and "T2" remain applicable.
For comparison, Table 6-1 and Figure 6-7 also show transient temperature history when helium' is used for water blowdown, vacuum drying and helium backfill. As noted in Section 1.0, the time limit "TI" is not applicable when using helium for water blowdown during vacuum drying operations.
The maximum 32PHB DSC component temperatures are listed in Table 6-2 for vacuum drying operations.
Table 6-2 Maximum 32PHB DSC Component Temperatures Neutron Top Bottom Fuel B asket D S C B asket S i l Shield On Cladding (Guide Sleeve)
(Shell 2 ) Absorber Rails Shield Shield OperatingCondition C
g e
)
)
Plate Plug Plug Water blowdown, vacuum drying Tmax Tmax Tmax Tmax Tmax Tmax Tmax with Nitrogen and helium backfill.
(OF)
(OF)
(OF)
(OF)
(OF)
(OF)
(OF) 29.6 Nitrogen @ 32 hrs (1) 711 682 212 680 429 212 229 kW Helium @ Steady-State 592 567 212 567 298 224 252 25.6 Nitrogen @ 40 hrs (1) 709 676 212 674 425 215 233 kW Helium @ Steady State 555 528 212 528 286 222 247 23.04 Nitrogen @ 56 hrs (1) 718 685 212 683 436 217 237 kW Helium @ Steady-State 524 499 212 498 279 221 243 Notes:
(1) The end of water blowdown and vacuum drying operations in nitrogen.
(2) The maximum DSC shell temperature is the temperature along the shell and does not include the top and bottom end plates.
Table 6-3 shows 32PHB DSC component average temperatures (including hottest & whole DSC sections) for vacuum drying operations.
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17of29 Table 6-3 32PHB DSC Component Average Temperatures (Hottest/Whole DSC Section)
Hottest Section (IF)
Whole DSC (IF)
Heat Load RO R45I R90 R135 IR180 Bask.
h Bask.
Rail Cavity Fuel (1)
(1)
(1)
(1)
Comp.
hell(
Comp (2)
She Gas (
End of Water Blowdown and Vacuum Drying Operations in Nitrogen 29.6 kW @ 32 hrs 374 425 374 425 374 561 212 513 405 212 495 560 25.6 kW @ 40 hrs 378 421 378 421 378 553 212 509 404 212 491 553 23.04 kW @ 56 hrs 389 432 389 432 3891 562 212 519 415 212 501 562 Steady-State Vacuum Drying Operations in Helium 29.6 kW 269 290 269 290 269 426 212 386 278 212 372 425 25.6 kW 262 279 262 279 262 399 212 364 268 212 352 399 23.04 kW 257 273 257 273 257 381 212 350 263 212 339 382 Notes: (1)
(2)
(3)
The locations of the rails are shown in [3], Figure 6-1.
Maximum average rail temperatures.
Based on all components in the DSC cavity.
(4) The maximum DSC shell temperature is the temperature along the shell and does not include the top and bottom end plates.
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18 of 29 Typical temperature plots for 32PHB DSC components for vacuum drying in in Figure 6-1 to Figure 6-3.
nitrogen are shown ANSYS 10.OAI NOV 25 2009 02:02:20 PLOT NO. 32 NODAL SOLUION STEP=-4 S3B =1 TIhE=32 TEW*
S* =350.646 SM0 =711.201 S350.646 390.708 430.769 470.931 510.893 550. 954 r-591. 016 631.018 671.139 711.201 ANSYS 10.0A1 NOV 25 2009 02:02:34 PLOT NO. 33 NODAL SOUJTION STEP=4 SUB =1 TIMB=32 S8 =339.324 SM1 =682.106 339.324 377.411 415.498 453.585 491.672 529.759
[_
567.846 605.932 644.019 682.106 Fuel Cladding Guide Sleeve ANSYS 10 0A1 NOV 25 2009 02:03:11 PLOT NO. 35 NODAL SOLUTION STEP=-4 9iB =1 TTME=32 SMN =336.857 S04 =428.602 336. 857 m 347. 051 357.244 367.438 377.632 387.826 398.02 E-- 408.214 M
418.408 428.602 ANSYS 10.0A1 NOV 25 2009 02:03:19 PLOT NO. 36 NODAL SOU/TIGON STEP=-4 0JB =1 TDlE=32 TEWP 07.N
=208. 987 SM< =228.075 208.987 211.108 213.229 215.35 217.471 219.592 221.712 223.833 225.954 228. 075 Basket Rail DSC Shell Figure 6-1 Temperature Plots for 32PHB DSC (Vacuum Drying in Nitrogen, 29.6 kW @ 32 Hours)
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19 of 29 ANSYS 10.AI NOV 24 2009 18:36:25 PLUT NO. 42 NODAL SOULTIC SUB =1 TIWýE40 SIM =355.023 SM =709. 465 355.023 394,406 433.788 473.17 512.553 551.935 591.317 630.7 670.082 709. 465 AISYS 10 0AI NOV 24 2009 18:36:31 PLOT NO. 43 NODAL SOLUTION STEP=-5 am =1 TI-E=40 SMN =344.43 SX =676.123 mm344.43 381.285 418.139 454.994 491.849 528.704 565.558 602.413 639.268 676.123 Fuel Cladding Guide Sleeve ANSYS l0.OA.
Nov 24 2009 18:36:48 FLo0 NO. 45 NDLSOLUTION STEP=-5 SUB =1 TIIE=40 SMN =342.123 SM =425.044 M
342.123 RM 351. 336 360.55 369.763 378.977 388.19 397. 404 C71406.611 415.831 425. 044 ANSYS 1O.OAO N08V 24 2009 18:36:51 PLOT NO.
46 NODAL SOLUTION STEP=-5 SUB =1 TIW=40 S1 =212 SM =232.182 212 214.242 216.485 218.727 220.97 223. 212 225. 455 227. 697 229.94 232.182 Basket Rail DSC Shell Figure 6-2 Temperature Plots for 32PHB DSC (Vacuum Drying in Nitrogen, 25.6 kW @ 40 Hours)
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20 of 29 ANSYS I0.OAl NOV 24 2009 20:04:11 PLOT NO. 52 NODAL SOUJTION STEP=6 SUB =1 TIME=56 TIE SM4 =367.203 S< =717.503 367.203 406.125 445. 047 483.969 522.892 561.814 F--
600.736 639. 659 678.581 717.503 ANSYS 10.0AI NOV 24 2009 20:04:18 PL.T NO. 53 NODAL SOUI'3ION STEP=6 SUB =1 TME56 TEMPF SMN =356.491 SM< =685.314 356.491 393.027 429.563 466.099 502.635 539.171 575.707 612. 242 648.778 685.314 Fuel Cladding Guide Sleeve ANSYS 10.0AI NOV 24 2009 20:04:35 PLOT NO. 55 NODAL SOLUTOIC SThP=-6 SUB =1 TIME=56 TMP SP14 =354.164 SM< =435.928 354.164 363.249 372.334 381. 419 390. 504 E-399.588 408.673 417.758 426.843 435. 928 ANSYS I0,OAO NOV 24 2009 20:04:39 PLOT NO. 56 NODAL SOLUTION STEP=6 SUB9
=1 TIME=56 7TbF SP1N =212 SM =236.415 212 214.713 217. 426 220.138 222.851 V-]225.564 V-7228.277 230.99 233.702 236.415 Basket Rail DSC Shell Figure 6-3 Temperature Plots for 32PHB DSC (Vacuum Drying in Nitrogen, 23.04 kW @ 56 Hours)
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21 of 29 Typical temperature plots for 32PHB DSC components for steady-state vacuum drying in helium are shown in Figure 6-4 to Figure 6-6.
ANSYS 10.OAI NOV 25 2Q09 02:29:16 PLOT NO. 92 NODAL SOLUTION STEP=I0 SUB =6 TDfE=I00 SM4 =247.783 S1
--591.562 247.783 285.981 324.179 362.376 400.574 438.772 476. 969 M1515.167 553.365 591.562 ANSYS 10O0 NOV 25 2009 02:30:09 pLar NO, 95 NODAL SOLUtION SUB =6 TDE=100 SMN =241.24 SM, =298.499 241.24 247.602 253.964 260.326 266.689 273. 051 279.413 285.775 M
292.137 298. 499 ANSYS 100Al NOV 25 2009 02:29:31 PIfLr NO. 93 NODAL SOLUrION STP=-10 SUB =6 TTME=100 SM4 =241.805 SM =567.186 241.805 277.958 314.112 350.265 386.418 422.572 458.725 494.879 531.032 567.186 ANSYS io.0AI NOV 25 2009 02:30:16 PLOT NO. 96 NODAL SOLUTION STEEP-10 SUB =6 TD=i00 34
=212 S4 =250.258 212 216.251 220.502 224.753 229.004 233. 255 C3231.505 M
241.756 246.007 250. 258 Fuel Cladding Guide Sleeve Basket Rail DSC Shell Figure 6-4 Temperature Plots for 32PHB DSC (Steady-State Vacuum Drying in Helium @ 29.6 kW)
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ANSYS 10.0AI NOV 24 2009 18:44:34 PLOT NO. 92 NODAL SOLUTION SMP=-10 SUB =5 TDhE=100 SM1 =243.121 SM8 =554.86 243.121 005 277.758 312.396 347.034 381.672 416.309 450.947 485.585 520.222 554.86 ANSYS 10.0AI NOV 24 2009 18:44:41 PLOT NO. 93 NODAL SOLUTION STEP=10 SUB =5 TIIE100 SMN =237.992 SM( =528.457 237.992 270.265 302. 539 334.813 367.087 399.361 C=1 431.635 463. 909 496.183 528.457 Fuel Cladding Guide Sleeve ANSYS 10.OA1 NOV 24 2009 18:44:57 PLOT NO. 95 NODAL SOLUTION S7EP=10 TiWE100 SMN =237.498 1M =285.936 237.498 242.88 H 248.262 253.644 259.026 264.408 269.79 275.172 280.554 285. 936 ANSYS i0.0AO NOV 24 2009 18:45:01 PL0T NO. 96 NODAL SOLUTION S7MP=10 SUB --
5 TIW'=100 SMN =212 SM =245.238 212 215.693 219.386 223. 079 r
226.772
=-v 230. 465 r-q234.158 237.851 241.545 245.238 Basket Rail DSC Shell Figure 6-5 (Steady-State Temperature Plots for 32PHB DSC Vacuum Drying in Helium @ 25.6 kW)
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23 of 29 ANSYS 10.0A1 NOV 24 2009 20:16:02 PLOr NO. 102 NODAL SOIUTION STEP=-11 SUB =4 TIME=100 TRIF SMN =240.067 SIX --524.005 S240. 061 271.616 303.164 334:713 366.262 397.81 429.359 460.908 492.457 524.005 ANSYS 10.OA1 NOV 24 2009 20:16:09 PLar NO. 103 NODAL SOLUTION STEF=-11 SUB =4 TIDE=100 S4 =235.443
=498.61 235.443 264.684 293. 925 323.166 352.406 381.647 410.888 440.129 469.37 498.61 Fuel Cladding Guide Sleeve ANSYS i0.Al NOV 24 2009 20:16:26 PLOT NO. 105 NODAL SOLUTION SIP=-11 SUB =4 TIIE=100 TEMW SMN =234.998 SIM =278.718 234.998 rM 239.855 244.713 249.571 MM 254.429 259.287 264.144 269.002 273.86 278.718 ANSYS 10.0A1 NOV 24 2009 20:16:30 PULr NO. 106 NODAL SOLUTION STEP=-11 9JB =4 Th3E=100 St4 =212 31% =241.894 212 215. 322
[
218.643 221.965 225.286 228.608 r[-- 231.929 71235. 251 238.572 241. 894 Basket Rail DSC Shell Figure 6-6 Temperature Plots for 32PHB DSC (Steady-State Vacuum Drying in Helium @ 23.04 kW)
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24 of 29 Maximum temperature histories of fuel cladding for vacuum drying operations are shown in Figure 6-7 through Figure 6-9.
800 I
j
~T1 T
700 Water Blowdown&
700-Vacuum Drying
//*,
600 T3-i-T
.= 500 400 E-Nitrogen water 300-
- IHelium water blowdown 200 0
8 16 24 32 40 4*
Time (hour) 3 56 64 72 80 Figure 6-7 Maximum Temperature History of Fuel Cladding for Vacuum Drying Operations @ 29.6 kW
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25 of 29 800 700 C
5 600 500 400 300 200 0
8 16 24 32 40 48 56 64 72 80 88 Time (hour)
Figure 6-8 Maximum Temperature History of Fuel Cladding for Vacuum Drying Operations @ 25.6 kW
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26 of 29 800 700 0
U E
600 500 400 300 200 0
8 16 24 32 40 48 56 64 72 80 88 Time (hour)
Figure 6-9 Maximum Temperature History of Fuel Cladding for Vacuum Drying Operations @ 23.04 kW
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27 of 29 I
7.0 CONCLUSION
The maximum fuel cladding temperatures for 32PHB DSC for vacuum drying operations are shown in Table 7-1.
Table 7-1 Maximum Fuel Cladding Temperatures for Vacuum Drying Operating Condition Fuel Cladding Limit Water blowdown and Vacuum Drying, Helium Tmax Tmax Backfill (OF)
(OF) 29.6 Nitrogen @ 32 hrs (1) 711 kW Helium @ Steady State (2) 592 25.6 Nitrogen @ 40 hrs (1) 709 kW Helium @ Steady State (2) 555 752 [1]
23.04 Nitrogen @ 56 hrs (1) 718 kW Helium @ Steady State (2) 524 Notes:
(1) The end of vacuum drying operations in nitrogen.
(2) Steady-state vacuum drying operations in helium.
The maximum component temperatures of 32PHB DSC for vacuum drying operations are summarized in Table 7-2.
Table 7-2 Maximum Basket Component Temperatures Fuel Basket DSC NA Basket IeTop Bottom Operating Condition Cladding (Guide Sleeve)
(Shell(3))
Plate Rails Pld Plug Water blowdown and Vacuum Tmax Tmax Tmax Tmax Tmax Tmax Tmax Drying, Helium Backfill (F)
(OF)
(OF)
(IF)
(OF)
(OF)
(OF) 29.6 Nitrogen @ 32 hrs (1) 711 682 212 680 429 212 229 kW Helium @ Steady-State(2) 592 567 212 567 298 224 252 25.6 Nitrogen @ 40 hrs (1) 709 676 212 674 425 215 233 kW Helium @ Steady State(2) 555 528 212 528 286 222 247 23.04 Nitrogen @ 56 hrs (1) 718 685 212 683 436 217 237 kW Helium @ Steady-State(2+
524 499 212 498 279 221 243 Notes:
(1) The end of vacuum drying operations in nitrogen.
(2) Steady-state vacuum drying operations in helium.
(3) The maximum DSC shell temperature is the temperature along the shell and does not include the top and bottom end plates.
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28 of 29 The maximum time limits for vacuum drying operations in nitrogen and the minimum time limits for reaching steady-state vacuum drying condition in helium after end of vacuum drying operations in nitrogen are listed in Table 7-3, respectively.
Table 7-3 Time Limits for Vacuum Drying Operations Heat Load (kW) 29.6 25.6 23.04 Maximum Time Limit in Nitrogen, T1 (Hrs) 32 40 56 Minimum Time Limit in Helium Backfill, T2 (Hrs) 32 32 30 Maximum Time Limit in Nitrogen, T3 (Hrs) 22 23 24 As seen from Table 7-1, the maximum fuel cladding temperatures calculated for vacuum drying operations are below the allowable limits. As seen from Table 7-2, the maximum temperatures for top and bottom shield plugs are below lead melting temperature limit of 6620F [2]. All design criteria specified in Section 4.1 are herein satisfied.
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29 of 29 8.0 LISTING OF COMPUTER FILES A summary of ANSYS runs is listed in Table 8-1. All the runs are performed using ANSYS version 10.0 [7] with operating system "Linux RedHat ES 5.1", and CPU "Opteron 275 DC 2.2 GHz" / "Xeon 5160 DC 3.0 GHz".
Table 8-1 Summary of ANSYS Runs Run Name Description Blowdown Gas Date / Time 32PHBVDNIMH Vacuum Drying Operations, 29.6 kW 11/25/09 02:31 AM 32PHBVDY1 Vacuum Drying Operations, 25.6 kW Nitrogen 11/24/09 06:45 PM 32PHBVDY2 Vacuum Drying Operations, 23.04 kW 11/24/09 08:17 PM 32PHBVDY4 Vacuum Drying Operations, 29.6 kW Helium 11/25/09 07:09 PM ANSYS macros, and associated files used in this calculation are shown Table 8-2 Associated Files and Macros in Table 8-2.
File Name Description Date / Time 32PHBModel.db [3]
32PHB DSC Model 07/10/09 07:49 PM 32PHBMatlH.inp Material properties for 32PHB DSC 09/14/09 04:55 PM including Helium 32PHBMat1N.inp Material properties for 32PHB DSC 09/14/09 04:58 PM including Nitrogen 32PHBHLZC2.MAC Heat generation for 32PHB DSC, 09/03/09 09:56 AM 29.6 kW 32PHBHLZC2A.MAC Heat generation for 32PHB DSC 09/29/09 02:09 PM below 29.6 kW Macro Maximum/Minimum temperatures 05/20/05 01:03 PM Results.mac Maximum and average 32PHB DSC 07/22/09 12:52 PM component temperatures The spreadsheet used in this calculation is listed in Table 8-3.
Table 8-3 List of Spreadsheet File Name Description Date / Time 32PHB VDY.xls Time histories of maximum fuel cladding temperatures 12/01/09 06:27 PM 32PHB VDY R-1.xls Excel spreadsheet for calculating time limit "T3" 08/09/11 04:32 PM