ML19114A317
| ML19114A317 | |
| Person / Time | |
|---|---|
| Site: | 07103052 |
| Issue date: | 03/05/2019 |
| From: | Teyssier P TN Americas LLC, Orano USA |
| To: | Division of Spent Fuel Management |
| Shared Package | |
| ML19115A128 | List:
|
| References | |
| DOS-18-011415-043-NPV, V1.0 | |
| Download: ML19114A317 (12) | |
Text
NON PROPRIETARY VERSION Form: PM04-4-MO-6 rev.02 Orano TN SAFETY ANALYSIS REPORT N O N P RO P R I ET AR Y V E R S I ON CHAPTER 1A-APPENDIX 14 Prepared by / signature Date TN-MTR P. TEYSSIER Identification:
DOS-18-011415-043 Version:
1.0 Page 1 / 12 TN International STRUCTURAL STRENGTH OF THE GISETE INTERNAL FITTINGS Table of Contents Revisions / versions history 2
Summary 3
- 1. Introduction 4
- 2. Description of the gisete internal fittings 4
- 3. Input data for design 4
- 4. Normal conditions of transport 7
- 5. Accident conditions of transport 9
- 6. Differential expansion 11
- 7. Conclusions 12
- 8. References 12
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 2 of 12 NON PROPRIETARY VERSION Revisions / versions history Rev. or Version Date Purpose and record of changes Prepared by / Checked by 1.0 See 1st page First issue P. TEYSSIER / T. WILLEMS
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 3 of 12 NON PROPRIETARY VERSION Summary The analyses provided in this chapter serve to:
justify the mechanical strength of the gisete content internal fittings at the maximum temperature in normal conditions of transport during the drop tests representative of normal conditions of transport; Justify the mechanical strength of elements of the internal fittings that perform axial wedging of the content during the axial drop test representative of accident conditions of transport.
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 4 of 12 NON PROPRIETARY VERSION
- 1.
Introduction This chapter presents the analysis of the mechanical strength of the internal fittings of the gisete content.
Its purpose is to analyse the mechanical behaviour of the internal fittings, at the maximum temperature in normal conditions of transport, during the drop tests representative of normal conditions of transport; In addition, justification is given for the mechanical strength of elements of the internal fittings that perform axial wedging of the contents during the axial drop test representative of accident conditions of transport.
- 2.
Description of the gisete internal fittings The concepts of the gisete internal fittings are presented in Appendix 14 of Chapter 0A. The internal fittings safety requirement plans are provided in appendix 0A-14-1.
- 3.
Input data for design 3.1.
Temperature The maximum temperature of the gisete internal fittings in normal conditions of transport (NCT) considered for demonstrations of mechanical strength is 100°C.
3.2.
Material properties The properties of the materials are presented in Appendix 14 of Chapter 0A. As a reminder, the properties of the materials used in the internal fittings at 100°C are as follows:
Aluminium type A Yield Strength (Re) 100 MPa Poissons ratio
()
0.33 Modulus of elasticity (E) 68 GPa 3.3.
Design criteria In order to guarantee the absence of strain of the internal fittings, it is verified that the stresses within the different components remain below the yield strength of the materials indicated in section 3.2.
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 5 of 12 NON PROPRIETARY VERSION 3.4.
Masses The masses of the different components of the internal fittings and contents are presented in appendix 14 of Chapter 0A and indicated in the following table:
Content / Internal fitting Mass of axial wedge Mass of radial wedge Content mass Gisete 4 255 kg 155 kg 2,270 kg Gisete 5 205 kg 295 kg 1,670 kg Gisete 8 225 kg 260 kg 212 kg 3.5.
Dimensions of the internal fittings The internal fittings safety requirement drawings are provided in appendix 0A-14-1.
Each internal fitting is composed of 2 parts:
an axial wedge; a radial wedge.
3.5.1.
Axial wedge The following dimensions are adopted for the analysis of the mechanical strength of the axial wedge:
Gisete 4 Shell Minimum thickness 29 mm Minimum internal diameter 605 mm Maximum height 427 mm Gisete 5 Shell Minimum thickness 29 mm Minimum internal diameter 600 mm Maximum height 319 mm
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 6 of 12 NON PROPRIETARY VERSION Gisete 8 Gusset plates Minimum thickness 29 mm Minimum width 330 mm Quantity 3
Maximum height 478 mm 3.5.2.
Radial wedge The following dimensions are adopted for the analysis of the mechanical strength of the radial wedge:
Gisete 4 Inner shell Minimum internal diameter 851 mm Maximum notch length 125 mm Number of notches for a ring 6
Rings Minimum thickness 29 mm Outer shell Maximum external diameter 956 mm Gisete 5 Inner shell Minimum internal diameter 701 mm Maximum notch length 125 mm Number of notches for a ring 6
Rings Minimum thickness 29 mm Outer shell Maximum external diameter 956 mm
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 7 of 12 NON PROPRIETARY VERSION Gisete 8 Inner shell Minimum internal diameter 571 mm Maximum notch length 125 mm Number of notches for a ring 6
Rings Minimum thickness 19 mm Outer shell Maximum external diameter 956 mm
- 4.
Normal conditions of transport 4.1.
Loads The mechanical strength of the internal fittings is analysed in the cases of a lateral drop and an axial drop.
Since the elements providing axial wedging are analysed in accident conditions of transport (see section 5), their mechanical strength in normal conditions of transport is considered to be guaranteed.
Therefore this section only examines the lateral drop configuration. The acceleration considered for a lateral drop of 0.3 m is, which corresponds, according to the drop test analyses presented in appendix 6 of Chapter 1 of this file, to a vertical drop of 0.3 m on bottom corner, with the centre of gravity aligned with the point of impact.
4.2.
Mechanical analysis for 0.3 m lateral drop For a lateral drop, the components providing wedging of the gisete content are the rings.
When a lateral drop occurs, the rings are compressed by the weight of the radial wedge and the content. Only two of the three rings are assumed to absorb the drop loads.
In addition, the support length of the rings is assumed to correspond to the distance between two shell notches.
The compression stress in the rings is:
= x
Where:
- mass of radial wedge and content, = + ;
- transverse acceleration, = ;
- surface area of rings when compressed,
= x x x
x ;
- number of rings absorbing the loads, = 2.
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 8 of 12 NON PROPRIETARY VERSION In addition, it is verified that the rings do not buckle.
The buckling verification is performed on the basis of a rectangular flat plate model subjected to a compression force.
Ring Associated plate model According to case 1a in table 15.2 in <1>, the critical buckling stress of a ring is:
= x
(1 2) x (
)
2 Where:
- modulus of elasticity, = 68 ;
- Poissons ratio, = 0.33 ;
- factor depending on the ratio
=
2
, = 6.92 for the sake of conservatism.
The critical buckling stress is compared with the previously calculated compression stress.
4.3.
Results The compression stresses in the rings of the different internal fittings are summarised below:
Stress Criterion
Gisete 4 29 MPa 100 MPa Gisete 5 31 MPa 100 MPa Gisete 8 16 MPa 100 MPa
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 9 of 12 NON PROPRIETARY VERSION The critical buckling stress of the internal fittings rings is summarised below:
Load Critical Gisete 4 29 MPa 613 MPa Gisete 5 31 MPa 904 MPa Gisete 8 16 MPa 585 MPa
- 5.
Accident conditions of transport 5.1.
Loads The mechanical strength of the elements of the internal fittings that perform axial wedging of the content is analysed for the axial drop test representative of accident conditions of transport.
The mechanical strength of these elements makes it possible to guarantee the absence of any shifted impact effect of the content on the cask lid.
The acceleration considered for an axial drop of 9 m is, which corresponds, according to the drop test analyses presented in appendix 9 of Chapter 1 of this file, to a vertical drop of 9 m on the top end.
5.2.
Mechanical analysis for 9 metre axial drop For an axial drop, the elements providing wedging of the gisete content are the shell of the internal fitting for the gisete 4 content, the shell of the internal fitting for the gisete 5 content and the gusset plates on the internal fitting for the gisete 8 content.
5.2.1.
Shell strength When an axial drop on the top end occurs, the shell is compressed by the weight of the axial wedge, the radial wedge and the content.
The compression stress in the shell is:
= x
Where:
- mass of axial wedge, radial wedge and content, = + + ;
- vertical acceleration, = ;
- surface area of the shell when compressed,
=
x((+2x)22) 4 In addition, it is verified that no shell buckling occurs.
The Euler load above which there is a risk of the shell buckling is calculated by the following formula:
= 2 x x
2 Where:
- modulus of elasticity, = 68 ;
- the quadratic moment of the shell, =
x((+2x)44) 64 The load is compared with the load (= x ) undergone by the shell.
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
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1.0 Page 10 of 12 NON PROPRIETARY VERSION 5.2.2.
Strength of gusset plates When an axial drop on the top end occurs, the gusset plates are compressed by the weight of the axial wedge, the radial wedge and the content.
The compression stress in the gusset plates is:
= x
Where:
- mass of axial wedge, radial wedge and content, = + + ;
- vertical acceleration, ;
- surface area of the gusset plates when compressed,
= x x.
In addition, it is verified that the gusset plates do not buckle.
According to case 1a in table 15.2 in <1>, the critical buckling stress of a gusset plate is:
= x
(1 2) x (
)
2 Where:
- modulus of elasticity, = 68 ;
- Poissons ratio, = 0.33 ;
- factor depending on the ratio
, = 3.45 for
= 1.45.
The critical buckling stress is compared with the previously calculated compression stress.
5.3.
Results The compression stresses in the shells of the different internal fittings are summarised below:
Stress Criterion
Gisete 4 68 MPa 100 MPa Gisete 5 55 MPa 100 MPa The critical buckling loads in the shells of the different internal fittings are summarised below:
Load Critical load Gisete 4 3.92.106 N 1.07.1010 N Gisete 5 3.17.106 N 1.87.1010 N
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 11 of 12 NON PROPRIETARY VERSION The compression stress in the internal fittings gusset plates is summarised below:
Stress Criterion
Gisete 8 36 MPa 100 MPa The critical buckling stress of the internal fittings gusset plates is summarised below:
Load Critical Gisete 8 36 MPa 2,033 MPa
- 6.
Differential expansion This section verifies that expansion of the internal fittings due to the temperature increase does not close the gap between the internal fittings and the cask cavity, potentially creating additional stresses.
The verification is carried out for:
the radial wedge-cavity gap, the axial wedge-cavity gap.
The maximum temperature of the internal fittings in normal transport conditions is considered to be 100°C.
The thermal expansion coefficient of type A aluminium is 23.4.10-6 K-1 according to appendix 14 of Chapter 0A The expansion of the cask cavity is conservatively ignored.
6.1.
Axial expansion On a conservative basis, it is assumed that the maximum height of the internal fittings (radial wedge and axial wedge) is equal to the maximum height of the cask cavity, i.e. 1,081 mm according to the cask safety requirement drawing in appendix 0-1 of this file.
The value of the thermal expansion is given by the following formula:
= x x Where:
- expansion due to temperature changes;
- thermal expansion coefficient, = 23.4. 106 1;
- height of the internal fitting, = 1,081 ;
- difference between the initial and final temperature, = 20 ° and = 100 °.
The axial expansion obtained is given in the following table:
Axial thermal expansion of the internal fitting 2.0 mm According to the internal fittings safety requirement drawings in appendix 0A-14-1, the minimum axial gap between the internal fittings and the cask lid is:
J1 4 mm
Form: PM04-4-MO-6 rev.02 N O N P RO P R I ET AR Y V E R S I ON Orano TN Identification:
DOS-18-011415-043 Version:
1.0 Page 12 of 12 NON PROPRIETARY VERSION The axial gap between the internal fittings and the lid is greater than the axial expansion of the internal fittings.
6.2.
Radial expansion The maximum wedge radius is 478 mm, according to the internal fittings safety requirement drawings in appendix 0A-14-1.
The value of the thermal expansion is given by the following formula:
= x x Where:
- radial expansion due to a temperature change;
- thermal expansion coefficient, = 23.4. 106 1;
- maximum external radius of the wedge, = 478 ;
- difference between the initial and final temperature, = 20 ° and = 100 °.
The radial expansion obtained is given in the following table:
Radial thermal expansion of the wedge 0.9 mm Thus, the maximum radius of the wedge after expansion is given by the following formula:
= +
The total radius of the wedge after expansion is given in the following table:
wedge radius after thermal expansion 478.9 mm This radius is less than the minimum radius of the TN-MTR cavity (480 mm).
The radial gap between the internal fittings and the cavity is not closed.
- 7.
Conclusions The calculations in this chapter justify the mechanical strength of the internal fittings in normal and accident conditions of transport.
- 8.
References
<1> Roarks Formulas for stress and strain, Seventh edition - Warren C. Young, Richard G.
Budynas - McGRAW-HILL International Edition