ML19114A319
| ML19114A319 | |
| Person / Time | |
|---|---|
| Site: | 07103052 |
| Issue date: | 03/05/2019 |
| From: | TN Americas LLC, Orano USA |
| To: | Division of Spent Fuel Management |
| Shared Package | |
| ML19115A128 | List:
|
| References | |
| DOS-18-011415-025-NPV, Rev. 1.0 | |
| Download: ML19114A319 (22) | |
Text
TN International CHAPTER 2-APPENDIX 1 TN-MTR Names Signatures Date Prepared by T. WILLEMS Ref. DOS-18-011415-025-NPV Rev. 1.0 Form: PM04-3-MO-3 rev. 2 Page 1/22 NON PROPRIETARY VERSION THERMAL ANALYSIS UNDER NORMAL CONDITIONS OF TRANSPORT TABLE OF CONTENTS
SUMMARY
- 1.
INTRODUCTION
- 2.
ASSUMPTIONS MADE
- 3.
MODELLING
- 4.
RESULTS
- 5.
CONCLUSION
- 6.
REFERENCES LIST OF TABLES LIST OF FIGURES
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 2 / 22 NON PROPRIETARY VERSION REVISION STATUS Revision Date Modifications Prepared by /
Reviewed by Old reference: DOS-16-00173678-210 0
N/A Document first issue.
TWI / APA New reference: DOS-18-011415-025 1.0 N/A New reference due to new document management system software.
TWI / APA
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 3 / 22 NON PROPRIETARY VERSION
SUMMARY
This document presents the thermal analysis of the TN-MTR packaging under normal transport conditions.
It aims to determine:
- maximum component temperatures and to verify that they are acceptable considering their limiting values,
- the temperature of the internal cavity to be considered for the thermal analysis of some contents under normal transport conditions presented in Chapter 2A.
The assumptions are as follows:
- The packaging is modelled in accordance with Chapter 0 with its shock absorbing cover and its trunnions,
- the packaging is in the vertical position (transport position),
- the bottom of the packaging is assumed to be adiabatic,
- the maximum internal thermal power in the packaging is conservatively assumed to be 5500 W for the calculations. In the calculation model, this power is distributed in the upper part of the basket volume over a height of 599 mm,
- the basket is assumed to be centred in the cavity radially and placed on the bottom of the packaging,
- ambient temperature and sunlight exposure conditions are as defined by the IAEA regulations in reference <1>. The ambient temperature is thus assumed to be equal to 38°C. Sunlight exposure is conservatively applied for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> / day,
- the gas used to fill the cavity is conservatively assumed to be air.
Temperatures calculated in the packaging under normal transport conditions with a conservative internal thermal power of 5500 W show that:
- the maximum seal temperature () is less than the allowable limiting temperature of 160°C specified for EPDM seals.
- the maximum resin temperature () is less than the allowable limiting temperature of,
- the maximum temperature of lead () is far below its melting temperature (327°C).
Moreover, the temperature of the internal cavity to be considered for the thermal analysis of the contents under normal transport conditions presented in Chapter 2A in this file is 117.3°C.
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 4 / 22 NON PROPRIETARY VERSION
- 1. INTRODUCTION This document presents the thermal analysis of the TN-MTR packaging under normal transport conditions as defined in the IAEA regulations in reference <1> and evaluates maximum component temperatures.
It is checked that these temperatures are compatible with the allowable limits.
- 2. ASSUMPTIONS MADE The main assumptions are as follows:
- the packaging is modelled in accordance with Chapter 0 with its shock absorbing cover and its trunnions;
- the packaging is assumed to be in the vertical position (position during transport).
- the bottom of the packaging is assumed to be adiabatic;
- the maximum internal thermal power in the packaging is conservatively assumed to be 5500 W for the calculations. In the calculation model, this power is distributed in the upper part of the basket volume over a height of 599 mm;
- the basket is assumed to be radially centred in the cavity (therefore a radial basket/cavity gap equal to 2 mm) and placed on the bottom of the packaging (therefore an axial basket/lid gap of 9 mm);
- ambient temperature and sunlight exposure conditions are as defined by the IAEA regulations in reference <1>. The ambient temperature is thus assumed to be equal to 38°C. Sunlight exposure is conservatively applied for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> / day;
- the gas used to fill the cavity is conservatively assumed to be air.
- 3. MODELLING 3.1 Software used The models, calculations and post-processing are made using the design and CAD code in reference <2>.
3.2 Geometry and mesh The packaging is modelled in accordance with Chapter 0 with its shock absorbing cover and its trunnions.
The geometry and the mesh of the digital model are shown in figures 2-1.1 and 2-1.2 respectively.
The packaging is modelled by the following elements (from the inside to the outside):
an internal enclosure made of stainless steel, a layer of lead shielding, a layer of resin thermal insulation, an external enclosure made of stainless steel, a stainless steel flange positioned on the top of the body to hold the lid.
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 5 / 22 NON PROPRIETARY VERSION The junction between the bottom and the shell on the outside is in the form of a truncated cone.
The fins are not represented. However, their influence in convective exchanges is taken into account by applying a correction factor to the convective exchange factor.
The lid is modelled by the lead layer and the outer metal enclosure.
The stiffener shell and the orifices are not modelled.
The shock absorbing cover is modelled by its plates and its different wood grades.
The calculations are made with a 1/4 model due to geometric symmetries and boundary conditions.
3.3 Properties of materials Material properties are presented in Table 2-1.1.
3.4 Thermal boundary conditions Thermal boundary conditions applied in the 3D models of the packaging are illustrated in figure 2-1.3.
3.4.1 Conduction Heat exchanges by conduction are calculated directly by the code <1> inside the model based on the thermal properties of the materials.
Heat exchanges by conduction through gaps in the model are fixed using conductive thermal couplings determined as follows:
ij gas ij e
C Where:
- gas the thermal conductivity of the medium (air in this case), in W/m/K (see Table 2-1.1),
- eij the distance separating the 2 surfaces considered, in m,
- Cij the conductive thermal coupling in W/m²/K.
All values of the different gaps present in the model that are modelled by an equivalent exchange coefficient are given in figure 2-1.4 and summarised in table 2-1.2.
3.4.2 Convective heat exchange coefficient on the outer surface of the package On the shock absorbing cover and the trunnions Convection applied to horizontal surfaces favourable to convection is applied by means of the coefficient taken from <3> and is in the form:
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 6 / 22 NON PROPRIETARY VERSION h = 1.51 x T 1/3 W/m2/K Convection applied to plane and cylindrical vertical surfaces is applied by means of the convection coefficient taken from <3> and is in the form:
h = 1.28 x T 1/3 W/m2/K Convection applied to cylindrical horizontal surfaces is applied by means of the convection coefficient taken from <3> and is in the form:
h = 1.22 x T 1/3 W/m2/K Convection applied to horizontal surfaces not favourable to convection is applied by means of the convection coefficient taken from <3> and is in the form:
h = 0.5 x T 1/4 W/m2/K On the packaging The outer shell of the packaging is fitted with stainless steel fins over a height of 1120 mm (see Chapter 0). Two different convective heat exchange coefficients are defined for the areas of the shell with and without fins.
These coefficients are derived from the analysis of the results obtained from the thermal test presented in Chapter 2-1.1 in this file.
Convection applied to the cylindrical surfaces of the packaging (away from the area with fins) is in the form:
h = 1.7 x T 1/3 W/m2/K The presence of fins is taken into account using a correction factor K derived from Chapter 2-1-1. The convective heat exchange coefficient used on the area with fins is then:
h = (1.7 x K) x T1/3 = (1.7 x 2.93) x T1/3 = 5 x T1/3 T is the temperature difference between the outside surface considered and ambient air (38°C).
3.4.3 Radiation Radiative exchanges are considered, firstly between outer surfaces and ambient air and secondly in the internal gaps within the model.
The net radiative flux exchanged between two surfaces i and j is calculated using the simplified equation below:
ij = Fgij (Ti 4-Tj
- 4) Si The grey view factors used in the model between two surfaces are given by the following formulas:
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 7 / 22 NON PROPRIETARY VERSION 1
1 1
1
j i
ij Fg
Where i and j are the emissivities of the two facing surfaces i and j.
Radiative exchanges between the outer surfaces of the package and ambient air are calculated by the Code <2> using a radiative box.
The emissivities of the materials are provided in table 2-1.1.
All the various radiative gaps used in the model are summarised in table 2-1.2 and shown in figure 2-1.4.
3.4.4 Sunlight exposure Sunlight exposure is conservatively applied during 24h/24.
Regulatory sunlight exposure during transport is fixed at:
- 0 W/m2 for plane horizontal surfaces facing downwards,
- 800 W/m2 for plane horizontal surfaces facing upwards,
- 200 W/m² for vertical surfaces,
- 200 W/m2 for other (non-horizontal) surfaces facing downwards,
- 200 W/m² for all other surfaces, Sunlight exposure on the model is presented in figure 12-1.3.
The solar flux density absorbed by the outer surface is equal to the sunlight exposure multiplied by the absorptivity of the surface, = E.
The absorptivities of materials are listed in Table 2-1.2.
3.4.5 Ambient temperature The ambient air temperature is set at 38°C, according to IAEA requirements
<1>.
3.5 Heat power The maximum thermal power of the radioactive content that can be transported in TN-MTR is 5000 W. However, maximum temperatures in this chapter are conservatively determined for a power of 5500 W.
In the model, power is applied to the homogeneous medium representing the active part of the basket (with an active height of 599 mm), as defined in Chapter 2 in this file.
- 4. RESULTS The model and the calculation are archived as described in reference <4>.
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 8 / 22 NON PROPRIETARY VERSION The isotherms are presented in figures 2-1.5, 2-1.6 and 2-1.7.
The following table shows maximum and mean temperatures for the different components under normal transport conditions.
Component NCT TMax
(°C)
Tmean
(°C)
Criterion Outer surface of the shell with fins 91.2 84.6 Outer surface of the shell (away from area with fins) 105.9 99.0 Outer surface of the truncated cone 103.0 97.0 Resin Lead 149.2 116 327 Cavity wall (bottom) 154.7 145.2 Cavity wall (shell) 117.3 113.5 Lid inner seal 114.5 113.1 160 Orifice plug inner seals 117.1 116.2 160 Shock absorbing cover plates 117.8 77.9 Shock absorbing cover wood 117.8 78.5 These results show that the maximum temperatures of the different packaging components remain less than their maximum allowable value given in Chapter 0.
The maximum temperature of the inner cavity of the uninterrupted section of the packaging is 117.3°C.
- 5. CONCLUSION Temperatures calculated in the packaging under normal transport conditions, as defined by the regulations <1>, with a conservative internal thermal power of 5500 W show that:
- the maximum seal temperature (117.1°C) is less than the allowable limiting temperature of 160°C specified for EPDM seals;
- the maximum resin temperature () is less than the allowable limiting value of
- the maximum lead temperature (149.2°C) is far below its melting temperature (327°C).
Moreover, the temperature of the internal cavity to be considered for the thermal analysis of the contents under normal transport conditions presented in Chapter 2A in this file, is 117.3°C.
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 9 / 22 NON PROPRIETARY VERSION
- 6. REFERENCES
<1> Applicable IAEA regulations: see chapter 00
<2> NX I-DEAS 6.1 M1 finite element calculation software interfaced with the TMG 6.0.1181 thermal module and the ESC 6.0.1181 fluids module distributed by Siemens PLM software
<3> HEAT TRANSMISSION, by W. H. Mc ADAMS (French version translated by A.
BEAUFILS, second edition, DUNOD Paris 1964).
<4> Archiving of calculations:
EMC001171T / Thermal / CAL-14-00107583-002-00 Model: TN_MTR Section FE model FE study Description TN-MTR Model 3D NCT 3D model of the TN-MTR packaging equipped with the MTR 52S basket used for calculations under normal transport conditions. The basket is homogeneous The shock absorbing cover and the trunnions are represented.
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 10 / 22 NON PROPRIETARY VERSION LIST OF TABLES Table Description Pages 2-1.1 Thermal properties of the materials used in the packaging 1
2-1.2 Summary of gaps modelled in the TN-MTR packaging 1
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 11 / 22 NON PROPRIETARY VERSION LIST OF FIGURES Figure Description Pages 2-1.1 Geometry of the model 3
2-1.2 Model meshing 1
2-1.3 Boundary conditions for the model 1
2-1.4 Details of modelled conductive and radiative couplings 1
2-1.5 Packaging temperature fields - Body and lid 1
2-1.6 Packaging temperature fields - Shock absorbing cover plates 1
2-1.7 Packaging temperature fields - Shock absorbing cover wood 1
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 12 / 22 NON PROPRIETARY VERSION TABLE 2-1.1 THERMAL PROPERTIES OF PACKAGING MATERIALS Materials Thermal conductivity (W.m-1.K-1)
Emissivity Solar absorptivity Stainless steel 16 0.3 0.4 Lead 32 Basket active zone (homogeneous environment) 3 (radial) 25 (axial)
Basket inactive zone (homogeneous environment) 3 (radial) 26 (axial)
Resin Air 0.025 + 6.86 x 10-5 x T T (in°C) 1 Balsa 0.05 Oak 0.2 Plywood 0.1
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 13 / 22 NON PROPRIETARY VERSION TABLE 2-1.2
SUMMARY
OF GAPS MODELLED IN THE TNMTR PACKAGING Component i / j Direction Gap
[mm]
Fgij Filling gas Shock absorbing cover / Lid Axial 6
0.176 Air Shock absorbing cover /
Lid Radial 1
0.176 Air Basket / Shell Radial 2
0.111 Air Basket / Lid Axial 9
0.176 Air
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 14 / 22 NON PROPRIETARY VERSION FIGURE 2-1.1 (1/3)
GEOMETRY OF THE MODEL Packaging body PROPRIETARY PROPRIETARY
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 15 / 22 NON PROPRIETARY VERSION FIGURE 2-1.1 (2/3)
GEOMETRY OF THE MODEL Trunnion
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 16 / 22 NON PROPRIETARY VERSION FIGURE 2-1.1 (3/3)
GEOMETRY OF THE MODEL Shock absorbing cover not punctured
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 17 / 22 NON PROPRIETARY VERSION FIGURE 2-1.2 (1/1)
MODEL MESHING Model with shock absorbing cover not punctured
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 18 / 22 NON PROPRIETARY VERSION FIGURE 2-1.3 BOUNDARY CONDITIONS FOR THE MODEL Total dissipated power:
5500 W distributed through the equivalent homogeneous volume Convection with ambient air h = 1.22 (T) 0.33 (on cylindrical surfaces) h = 1.28 (T) 0.33 (on vertical surfaces)
Sunlight exposure:
200 or 400 W/m² where = 0.4 Radiation:
Fgij = 0.3 where trunnions = 0.3 Convection with ambient air h = 1.7 (T) 0.33 Sunlight exposure:
200 W/m² where = 0.4 Radiation:
Fgij = 0.3 where steel = 0.3 Convection with ambient air h = 5 (T) 0.33 Sunlight exposure:
200 W/m² where = 0.4 Radiation:
Fgij = 0.3 where steel = 0.3 Convection with ambient air h = 0.5 (T) 0.25 Sunlight exposure:
0 W/m² Radiation:
Fgij = 0.3 where steel = 0.3 Convection with ambient air h = 1.51 (T) 0.33 Sunlight exposure:
800 W/m² where = 0.4 Radiation:
Fgij = 0.3 where steel = 0.3 Convection with ambient air h = 1.28 (T) 0.33 Sunlight exposure:
400 W/m² where = 0.4 Radiation:
Fgij = 0.3 where steel = 0.3
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 19 / 22 NON PROPRIETARY VERSION FIGURE 2-1.4 DETAILS OF MODELLED CONDUCTIVE AND RADIATIVE COUPLINGS symb ol Exchange considered General significance IR radiation value of the view factor between the two walls Conduction Value of the gap in mm between the two walls (gas)
Basket / Shell 0.111 NCT: 2 mm (Air)
Basket / Lid 0.111 9 mm (Air)
Shock absorbing cover / Shell 0.176 1 mm (Air)
Shock absorbing cover / Lid 0.176 6 mm (Air)
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 20 / 22 NON PROPRIETARY VERSION FIGURE 2-1.5 PACKAGING TEMPERATURE FIELD Body and lid
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 21 / 22 NON PROPRIETARY VERSION FIGURE 2-1.6 PACKAGING TEMPERATURE FIELD Shock absorbing cover plates
TN International DOS-18-011415-025-NPV Rev. 1.0 Page 22 / 22 NON PROPRIETARY VERSION FIGURE 2-1.7 PACKAGING TEMPERATURE FIELD Shock absorbing cover wood