ML19114A306
| ML19114A306 | |
| Person / Time | |
|---|---|
| Site: | 07103052 |
| Issue date: | 03/05/2019 |
| From: | Lecoq A TN Americas LLC, Orano USA |
| To: | Division of Spent Fuel Management |
| Shared Package | |
| ML19115A128 | List:
|
| References | |
| Download: ML19114A306 (38) | |
Text
TN International CHAPTER 1 - APPENDIX 5 TN-MTR Names Signatures Date Prepared by A. LE COQ Ref.
DOS-18-011415-011-NPV Rev. 1.0 Form: PM04-3-MO-3 rev. 2 Page 1/38 NON PROPRIETARY VERSION SIMILARITIES BETWEEN THE TN-MTR PACKAGING AND THE 1/2 SCALE MOCKUP TABLE OF CONTENTS
SUMMARY
- 1. INTRODUCTION
- 2. MOCKUP FOR DROP TESTS
- 3. CHOICE OF THE CONTENT OF THE DROP MOCKUP
- 4. CONCLUSIONS
- 5. REFERENCES LIST OF TABLES LIST OF FIGURES
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 2/38 NON PROPRIETARY VERSION REVISION STATUS Revision Date Modifications Prepared by /
Reviewed by Old reference: DOS-16-00173678-100 2
N/A Document first issue. Revision number intentionally set to correspond to the source document revision number.
ALC / TWI New reference: DOS-18-011415-011 1.0 N/A New reference due to new document management system software.
ALC / TWI
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 3 / 38 NON PROPRIETARY VERSION
SUMMARY
This appendix to chapter 1 presents the mockup for the TN-MTR packaging and its contents that will be used for the drop tests.
Drops are defined by accident conditions in IAEA rules <2>.
The packaging mockup is defined with reference to the packaging design presented in chapter
- 0.
The basket mockup is defined on a bounding basis with reference to the design of the MTR-68 basket presented in chapter 0A. The mechanical characteristics of the basket support structure are corrected as a function of temperatures calculated in chapter 2.
The purpose of this document is to demonstrate that the drop mockup is representative of the packaging and its strength.
The information contained in this appendix is used mainly for the analysis of drop tests.
The characteristics of the content of the drop mockup of the TN-MTR packaging corrected to full scale bound the allowable contents:
- Maximum mass of the mockup (corrected to full scale) M = 2880 kg (for comparison, the maximum allowable mass of the TN-MTR content: 2800 kg, see chapter 1).
- Mass per unit length of compartments in the mockup of the MTR-68 basket (corrected to full scale): M= 26.6 kg/m (for comparison, the maximum allowable mass per unit length per compartment of the MTR-68 basket is: 20.4 kg/m, see chapter 0A-2).
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 4 / 38 NON PROPRIETARY VERSION
- 1. INTRODUCTION The purpose of this document is to present the definition of the drop mockup and similarities or differences between the drop mockup and the full scale TN-MTR packaging.
- 2. MOCKUP FOR DROP TESTS 2.1. Description of the drop test mockup The mockup is shown on the design drawing attached in Appendix 4 to chapter 1. The parts list for the mockup is shown in Table 1-5.1.
The properties of the drop test mockup are as follows:
- 1/2 scale geometric representation of the TN-MTR packaging with a standard type lid.
- Procurement specification for materials identical to the real packaging for the insulation, steel, fasteners and wood. The lead used is soft lead in compliance with the lead in the packaging (99.9% lead). The materials used for the mockup are given in table 1-5.7.
- Mass of the mockup ballasted to the maximum allowable mass of the packaging with its heaviest content.
- Position of the centre of gravity representative of the centre of gravity of the full scale packaging. The centre of gravity is slightly offset due to the placement of the spacer and the inversion of the position of the spacer during the tests.
Variation of the centre of gravity as a function of the contents of the full scale packaging.
The distance between the bottom and the centre of gravity varies from 856 mm at full scale (packaging fully loaded) to 875 mm (packaging with basket, zero assembly mass), or a variation of (875-856)/1610 = 1% of the height of the body.
The influence of the load on the position of the centre of gravity is therefore not significant.
Variation of the centre of gravity as a function of the position of the spacer in the mockup.
The centre of gravity of the mockup when the spacer is at the bottom of the cavity is:
hCG1 =
totale spacer pins basket pins basket packaging packaging M
Mspa h
M h
M h
1
/
/
1 Where:
hpackaging: height of the centre of gravity of the empty mockup, determined as a function of the centre of gravity of the full scale packaging, calculated in <1>
hempty packaging = 877 / 2 = 438.5 mm Mpackaging: mass of the empty mockup, equal to the sum of the masses of the body, the lid and the shock absorbing cover, given in Table 1-6.2.
Mempty packaging = 1920 + 320 + 180 = 2420 kg
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 5 / 38 NON PROPRIETARY VERSION h1basket/ pins: height of the centre of gravity of the 1/2 scale basket and the pins, calculated from the bottom of the packaging, assuming that the centre of gravity of the basket/ pins assembly at the centre of the height of the basket is 360/2 =
180 mm h1basket/pins = 135 bottom of mockup) + 172 (spacer) + 180 = 487 mm Mbasket/pins = 41 + 191 = 232 kg, according to table 1-6.2 h1spacer: height of the centre of gravity of the 1/2 scale, calculated from the bottom of the packaging, with the spacer tray facing upwards.
h1spacer= 135 bottom of mockup) + 172 - 77 = 230 mm Mspacer: mass of spacer = 127 kg, according to table 1-6.2 Mtotal = total mass of the mockup in the drop configuration = 2 780 kg (see table 1-6.2).
Hence: hCG1 =
780 2
127 230 232 487 420 2
5, 438
= 433 mm The centre of gravity of the mockup when the basket is at the bottom of the cavity is:
hCG2 =
total spacer spacer pins basket pins basket packaging packaging M
M h
M h
M h
2
/
/
2 Where:
h2basket/pins: height of the centre of gravity of the 1/2 scale basket and pins, calculated from the bottom of the packaging h2basket/pins = 135 (bottom of mockup) + 180 = 315 mm h2spacer: height of the centre of gravity of the 1/2 scale spacer, calculated from the bottom of the packaging, with the spacer tray facing downwards.
h2spacer = 135 (bottom of mockup) + 360 (basket) + 77 = 572 mm Hence: hCG2 =
780 2
127 572 232 315 420 2
5, 438
= 434 mm Therefore the difference in the height of the centre of gravity is:
hCG = hCG1 - hCG2 = 433 - 434 = - 1 mm, or 1 / 805 = 0.1%
Therefore the variation of the position of the centre of gravity as a function of the position of the spacer is negligible.
- Welds made identically and identical material used.
- Simulation of fuels and the basket, restoring the worst internal fitting arrangement of the packaging in case of a drop.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 6 / 38 NON PROPRIETARY VERSION This mockup is designed such that drops are representative of the mechanical strength of the TN-MTR packaging.
A lid based on the standard model is used to close the packaging and the double seal system, along with the associated leak test orifice, are installed identically to the full scale packaging (reduced to scale). One of the two orifices present on the lid with its screwed plug, fitted with two seals, is also represented at 1/2 scale. As part of the drop tests, one of the orifices is used to create a vacuum in the cavity for the leak tests.
The strength of the SEC lid will be studied and demonstrated by calculations in comparison with the strength of the standard lid in a drop case, based on tests carried out on this representative mockup (see chapter 1-8).
Containment welds are covered with a strip of glass wool (on the lead side) to improve the circulation of helium used for the leak test. The glass wool is held in position by stainless steel retaining arms. A hole is drilled through the outer containment and the layers of insulation and lead, so that helium can be injected directly onto the glass wool.
The drop test programme requires the use of the following mockup elements (at 1/2 scale):
- 1 TN-MTR packaging (body and standard lid),
- 1 handling strap
- 3 shock absorbing covers (2 spare covers),
- instrumentation and associated equipment,
- leak test device.
Differences between the design of the TN-MTR packaging and the as-built drop mockup are presented in table 1-5.3.
2.2. Tightening torque on mockup screws Forces due to tightening torques applied to packaging screws are compared with tightening torques applied to mockup screws. The screws concerned are lid to body attachment screws (150), shock absorbing cover to body attachment screws (151) and plug to lid attachment screws (350).
The force due to tightening torques for packaging screws is calculated in chapter 1-10. The same calculation method is used to calculate prestressing forces in mockup screws.
Forces in the mockup and the full scale packaging are proportional to the square of the scale ratio:
Fmockup = ² Ffull scale where = 1/2, = scale ratio For the studied screws in the mockup, the useful values are as follows:
Type p (m) d2 (m)
Ø screw head e
d (m)
Ø hole under head id (m) rm (m)
MODEL Lid M14 2.10-3 12.701.10-3 21.10-3 16.10-3 9.31.10-3 Orifice plugs M6 1.10-3 5.350.10-3 10.10-3 7.5.10-3 4.41.10-3
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 7 / 38 NON PROPRIETARY VERSION Shock absorbing cover M20 2.5.10-3 18.376.10-3 30.10-3 20.10-3 12.67.10-3 Comparisons between the different tightening forces are given in the following table:
Lid to body attachment screws (reference 150):
Orifice plug to lid attachment screws (reference 350)
Shock absorbing cover to body attachment screws (reference 151):
Packaging*
mockup Packaging*
mockup Packaging*
mockup Screw type M30 M14 M12 M6 M42 M20 Tightening torque (N.m) 660 70 40 8
660 70 Uncertainty on tightening torque 10%
20%
10%
20%
10%
20%
Coefficient of friction 0.0742 Uncertainty on coefficient of friction 16.10 %
Min. tightening force (kN) 161*
31.8 24*
7,92 119*
23,2 Max. tightening force (kN) 258*
61.8 38*
15,3 191*
45,3 Ratio:
packaging mockup F
F min 2
min 2
0.79 1.33 0.78 Ratio:
packaging mockup F
F max 2
max 2
0.96 1.62 0.95
- Value calculated in Chapter 1-10 For lid and shock absorbing cover attachment screws, we will use the above ratios to demonstrate that the axial force due to tightening packaging screws is higher than the axial force due to tightening mockup screws.
Moreover, the coefficients of thermal expansion of the different parts are as follows (see chapter 0):
- For screws: screw = 11.5 x 10-6 /°C
- For screwed assemblies: screwed ass = 16 x 10-6 /°C These coefficients show that the screwed assemblies expand more than the screws.
Therefore the increase in the packaging temperature induces an increase in prestresses in packaging screws (see chapter 1-10). Therefore, when the mockup has dropped to ambient
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 8 / 38 NON PROPRIETARY VERSION temperature, taking account of differential expansion on the packaging tends to increase the representativeness of the mockup.
Therefore drop conditions are worse on the mockup than on the packaging, for the lid and shock absorbing cover attachment screws.
However, the above ratios show that the axial force due to tightening of plug attachment screws in the packaging is lower than the axial force due to tightening of these screws in the mockup. The behaviour of plug attachment screws in a drop condition is analysed in chapter 1-9.
2.3. Influence of the mechanical properties of the resin on damping The packaging as described in chapter 0 may be equipped with either F resin or Vyal B resin. The TN-MTR packaging contains very little resin (resin thickness very low compared with the lead thickness). The resin only absorbs a small quantity of energy during impact, compared with lead. Consequently, its influence on crushing observed after a drop is negligible.
Therefore the drop mockup is representative for this aspect.
- 3. CHOICE OF THE CONTENT OF THE DROP MOCKUP The content of the drop mockup is also tested during the drop tests, therefore it must be representative of the content of the packaging, particularly for the following criteria:
- maximum mass of the mockup content: basket plus assemblies,
- geometric model of the mechanically resistant basket structure and the basket failure mode.
The content of the mockup is chosen to represent the worst case load application mode, and its mass is adjusted to the maximum mass of possible contents of the TN-MTR. The distribution of forces on the cavity is the same as in the TN-MTR packaging.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 9 / 38 NON PROPRIETARY VERSION The contents of the TN-MTR packaging are transported in several different types of baskets, of which the most important are:
- RHF basket: basket composed of a bottom plate, a stainless steel outer shell and borated steel stiffeners (see drawings in Appendix 1 to chapter 0A).
- Multi-compartment baskets (MTR-68, MTR-52, MTR-52S and MTR-44): baskets composed of stainless steel disks, arranged at regular intervals along the height and separated by borated aluminium disks. All disks are stacked and assembled by threaded pins.
Each disk features N compartments (N = 68, 52 or 44) with square cross-sections and 8 partial compartments in the case of the MTR-68 basket. The MTR-44 basket has a bottom.
The maximum mass of the basket combined with its assemblies is equal to 2800 kg (see appendices to chapter 0A) for the full-scale package.
In the case of a vertical drop on the bottom, the worst case assembly is a bottomless multi-compartment basket, because since there is no bottom plate and no junction between the assemblies, the loading mode is approximately a uniformly distributed load on the surface. The MTR-68 basket is taken to be the worst case assembly.
The RHF and MTR-44 baskets comprise a bottom plate that resists some of the forces and applies them to the periphery around the bottom of the body.
Totals masses of the different loaded baskets are the same (2 800 kg, see appendices to chapter 0A). Thus, in the case of a top-down vertical drop of the packaging, the MTR-68 basket will arbitrarily be used as the design basis assembly.
The worst case for a radial drop is a multi-compartment basket because all forces are transmitted through the steel disks alone, while the load for the RHF basket is distributed uniformly along the height. Therefore the MTR-68 basket design will also be used for this drop configuration.
In conclusion, to obtain the worst case, the content of the drop mockup must simulate the loading mode of the loaded MTR-68 basket.
Differences between the design of the MTR-68 basket and the mockup basket are presented in table 1-5.4. This table should be read with table 1-5.5 that presents differences between the basket mockup design and the as-built mockup.
The representativeness of the basket is defined as follows:
The mechanical strength of the content of the drop mockup is not tested for axial drops or for drops on corner.
Stresses generated in the basket by axial drops are low because forces due to the assemblies are resisted directly on the bottom of the packaging and therefore the basket only resists its self-weight.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 10 / 38 NON PROPRIETARY VERSION Stresses at an acceleration equal to 400 g are:
S h
S S
h S
m
The severe case in which the basket is made of steel is calculated (steel is the densest material used in the basket) over the entire height of the cavity:
3, 33 81
,9 400 10 850
,7 080 1
6
MPa.
This stress is low and is below the yield stresses of the basket materials.
In the case of a drop on corner, vertical accelerations are lower than in the case of an axial drop due to the smaller impact area, and the projection on the principal axis of the basket is lower than in the case of an axial drop, and therefore less than the yield stress of basket materials.
Therefore the basket mockup is only used to verify the strength of the basket in the case of a lateral drop.
The mass of the content of the drop mockup is adjusted by a spacer acting as ballast to be representative of the maximum load of the TN-MTR.
The maximum allowable mass of the content (basket plus assemblies) is 2800 kg (See Chapter 1), which corresponds to a minimum mass of the content of the drop mockup to be respected equal to 350 5,0 800 2
3 min
i m
kg According to table 1-5.2, the content of the drop mockup is 360 kg, which is conservative and enables a maximum mass of the packaging content equal to:
880 2
5,0 360 3
M kg The strength of the load bearing structures is exactly the same as the strength of the full scale disks. Differences between the basket and the drop mockup are given in table 1-5.4.
Non-load bearing disks (made of aluminium) are designed such that there is no contact with the pins, which prevents partial resistance of forces due to "assemblies".
Disks are hollowed, so that assemblies are supported only by the load-bearing disks (see drawings in Appendix 4 in chapter 1).
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 11 / 38 NON PROPRIETARY VERSION The thickness of the periphery of the aluminium disks is increased to resist some of the mass of the disks so as to respect the mass distribution. One result is that "assemblies" at the periphery of the disks are supported on the aluminium disks and not on the load-bearing disks. This has no significant influence on the strength of the basket, because firstly the part opposing displacement of "peripheral assemblies" is loaded in compression with no risk of buckling and therefore with no risk of failure and secondly forces resisting the centre "assemblies" pass through the cores of the basket and therefore are not added to the forces of the peripheral "assemblies".
Compartments containing basket instrumentation are not filled. The corresponding mass is distributed by increasing the mass of the pins in the other compartments. Thus, in the case of a lateral drop, the mass passing through the core of the basket close to the line of impact is maximum.
The core near the bottom of the basket in the drop configuration resists about half the two rows of compartments, or 18 compartments (the two lower assemblies are directly resisted by the periphery of the basket). The number of loaded compartments taking account of compartments left empty for instrumentation is 16.
Therefore the percent load reduction is:
11 18 18 16
This percent will be used to determine the mass per unit length of "assemblies" installed in the full compartments.
The mass of "assemblies" is determined to be representative of the maximum mass of assemblies (axial drop case) and the maximum mass per unit length.
Table 1-5.8 shows that the maximum mass per unit length of the different assemblies is 20.4 kg/m. At 1/2 scale, allowing for the percent load reduction due to instrumentation (defined in the previous section), this mass must be at least:
66
,5 5,0 11
,1 4,
20 2
min
i unitlength m
kg/m Moreover, buckling is proportional to Young's modulus. To take account of the loss of buckling strength due to the reduction in Young's modulus between 20°C and 300°C, the mass is increased by the ratio of the values of the modulus at each temperature.
Young's modulus of Z6 CNU 17 04 steel at 20°C = 200,000 MPa Young's modulus of Z6 CNU 17 04 steel at 300°C = 185,000 MPa Therefore 12
,6 185 200 66
,5 min
i unitlength m
kg/m Assemblies are represented by 6 mm diameter pins, with a variable number depending on the compartments (see table below).
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 12 / 38 NON PROPRIETARY VERSION The mass per unit length is calculated by the following relation:
2 4 d n
munitlength Where:
n = number of pins d = diameter of pins = 6 x10-3 m,
- density of steel = 7850 kg/m3 Compartments Minimum number of pins n
Mass per unit length mlinear 1:2 scale Full compartments 28 6.21 kg/m 1:2 scale Partial compartments 25 5.55 kg/m Table 1-5.8 shows that the maximum mass per unit length is 19.4 kg/m. At 1/2 scale, this mass should be at least:
mmin = 19.4 x 0.53 = 2.42 kg The corresponding number of pins is calculated by the following relation:
2 4 d l
n m
Where:
n = number of pins
- length of pins = 0.335 m d = diameter of pins = 6 x10-3 m,
- density of steel = 7850 kg/m3
4 2
d l
m n
33 4
850 7
)
10
.6
(
335
,0 42
,2 2
3
n pins.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 13 / 38 NON PROPRIETARY VERSION The following table gives the choice of the number of pins and mass increase percentages:
n =
Number of pins Mass Mass per unit length 1:2 scale Full compartme nt 36 2.68 kg 1
42
,2 68
,2
= 10% 7.99 kg/m 1
12
,6 99
,7
= 30%
1:2 scale Partial compartme nt 25 1.86 kg 5.54 kg/m Therefore the maximum allowable mass per compartment is:
4, 21 5,0 68
,2 3
max
M kg The maximum allowable mass per unit length is calculated from the real mass per unit length in the basket mockup, minus corrections made to Young's modulus and to the mass of the pins. Using the same calculations as above, we obtain:
6, 26 000 200 000 185 11
,1 5,0 99
,7 3
max
lin M
kg/m The geometry of the assemblies is defined to be representative of a severe loading mode of the assemblies. The installation of loose small diameter pins simulates a linear load on the compartment cross-section, that is conservative in comparison with a rigid assembly that resists forces directly on the edges of the compartment.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 14 / 38 NON PROPRIETARY VERSION Orientation of the basket in the mockup The orientation of the basket relative to the packaging is defined such that its axis of minimum resistance is in line with the drop direction causing the maximum accelerations.
The calculation in chapter 1A-2 shows that the maximum stress in the basket stainless steel disks (load bearing disks) occurs when the rows of compartments are at an angle of 30° from the drop direction. This maximum stress is obtained on the outer shell of the disk.
Furthermore, chapter 1A-2 also shows that maximum stresses in the disk cores occur when the rows of compartments are at an angle of 0° from the drop direction.
Moreover, the minimum acceleration causing failure of the structure by buckling as calculated in chapter 1A-2, occurs for an angle of 0° between the rows of compartments and the drop direction.
In conclusion, despite the fact that maximum stresses occur when the angle between the rows of compartments and the drop direction is not zero, the basket is oriented such that this angle is 0°; this is to be representative of maximum stresses in basket disk cores and of the buckling failure mode.
Design of the spacer The spacer is designed so as to increase the mass of the content.
The mass of the spacer is chosen to bound the possible contents of the TN-MTR packaging (see previous point on the mass of the content).
The material and the shape of the spacer are chosen so that it is easy to make, handle and install it in the cavity.
A diagram of this spacer is shown below in figure 1-5.1.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 15 / 38 NON PROPRIETARY VERSION
- 4. CONCLUSIONS The drop tests are done with a mockup simulating the packaging body, and its shock absorbing cover and a basket.
The packaging mockup is representative of the full scale packaging and the design or production differences are conservative or without effect on the strength of the mockup or its dynamic behaviour.
In the case of a drop, the basket mockup used during the tests is representative of the most severe mechanical load on the packaging cavity.
This basket is representative of the dynamic behaviour of the MTR-68 basket in the lateral drop case.
The load in this basket is composed of pins, to obtain a conservative simulation of the load of fuel assemblies in a drop case.
The basket is ballasted using a spacer, with a mass that bounds the contents of the TN-MTR package.
- 5. REFERENCES
<1> TRANSNUCLEAIRE Calculation note Mass summary: 4466-B-11;
<2> Applicable IAEA regulations: see chapter 00;
<3> Standard E 25-030 - August 1984 -Attachment elements - screwed assemblies.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 16 / 38 NON PROPRIETARY VERSION LIST OF TABLES Table Description Pages 1-5.1 Mockup parts list 3
1-5.2 Masses of the TN-MTR and the mockup 1
1-5.3 Design differences between the TN-MTR packaging and the drop mockup 9
1-5.4 Design differences between the MTR-68 basket and the basket mockup 2
1-5.5 Differences between the design of the basket mockup and the as-built basket mockup 1
1-5.6 Differences between assemblies and the load in the basket mockup 1
1-5.7 Materials used for the packaging, the mockup and the ballast 1
1-5.8 Mass per unit length of assemblies.
1 1-5.9 Tightening torques for the mockup screws 1
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 17 / 38 NON PROPRIETARY VERSION LIST OF FIGURES Figure Description Pages 1-5.1 Diagram of the spacer 1
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 18 / 38 NON PROPRIETARY VERSION TABLE 1-5.1 (1/3)
MOCKUP PARTS LIST Reference Designation Number Material 100 SHELL 1
101 Inner shell 1
Lead 103 Insulation shell 1
type F resin 104 Outer shell 1
Z3 CN 18-10 130 Trunnions 2
Z3 CN 18-10 150 Lid attachment screws M14x25 CHC 20 Class 12.9 151 Shock absorbing cover attachment screw M20 x 30 CHC 6
Class 12.9 170 Lid centring pin 1
Stainless steel 171 Cover centring pin 1
Stainless steel 172 Teflon-coated 1/4" gas plug 1
Stainless steel 180 M20 plug 1
Bronze 200 BOTTOM 1
201 Bottom internal disk 1
Z3 CND 22 05 Az 202 Bottom lead disk 1
Lead 203 Bottom insulating disk 1
Type F resin 204 Bottom external disk 1
Z3 CN 18-10 251 Insulating shell / insulating bottom connection 1
Type F resin 252 External shell / external bottom connection 1
Z3 CN 18-10 300 LID 1
301 Lid inner disk 1
Z3 CND 22 05 Az 302 Lead outer ring 1
Lead 305 Lid stiffener shell 1
Z3 CND 22 05 Az 306 Lid outer shell 1
Z3 CND 22 02 Az 307 Lid flange 1
Z3 CND 22 05 Az 312 M10 plug 2
Bronze 330 Orifice B plug 1
Z3 CND 22 05 Az 331 Orifice lid penetration 2
Z3 CN 18-10 350 Orifice plug attachment screw M6 x 18 CHC 4
Class 12.9
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 19 / 38 NON PROPRIETARY VERSION TABLE 1-5.1 (2/3)
MOCKUP PARTS LIST Reference Designation Number Material 361 Internal lid seal ins: 539, torus: 5.33 Shore hardness: 80 1
VITON 362 External lid seal ins: 563, torus: 5.33 Shore hardness: 80 1
VITON 365 Internal plug seal ins: 41.2, torus: 2.65 Shore hardness: 80 1
VITON 366 External plug seal ins: 56, torus: 2.65 Shore hardness: 80 1
VITON 368 M10 plug seal ins: 2.6, torus: 1.9 Shore hardness: 80 2
VITON SHOCK ABSORBING COVER WOOD 400 Bottom ring, around trunnions, fibres in radial direction 4
Oak 401 Bottom ring, between stiffeners, fibres in radial direction 4
Oak 402 Bottom ring, 90° from trunnions, fibres in radial direction 4
Oak 500 Intermediate ring, around trunnions, fibres in radial direction 4
Oak 501 Intermediate ring, between stiffeners, fibres in radial direction 4
Oak 502 Intermediate ring, 90° from trunnions, fibres in radial direction 4
Oak 520 Central bottom disk 1
Plywood 521 Central top disk 1
Plywood 600 Top inner ring, around trunnions, fibres in vertical direction 4
Balsa 601 Top inner ring, between stiffeners, fibres in vertical direction 4
Balsa 602 Top inner ring, 90° from trunnions, fibres in vertical direction Balsa 605 Top outer ring, 90° from trunnions, fibres in radial direction 4
Balsa
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 20 / 38 NON PROPRIETARY VERSION TABLE 1-5.1 (3/3)
MOCKUP PARTS LIST Reference Designation Number Material PLATES IN SHOCK ABSORBING COVER 700 Bottom inner shell 1
Z3 CN 18-10 701 Outer shell 1
Z3 CN 18-10 702 Top inner shell 1
Z3 CN 18-10 703 Portion of shell in trunnion recesses 2
Z3 CN 18-10 704 Shear resisting shell 1
Z3 CN 18-10 710 Trunnion recess end plates 4
Z3 CN 18-10 711 Radial stiffeners 8
Z3 CN 18-10 720 Disk under shock absorbing cover 1
Z3 CN 18-10 721 Central bottom disk 1
Z3 CN 18-10 722 Screw support ring 1
Z3 CN 18-10 723 Central intermediate disk 1
Z3 CND 22 05 Az 724 Central top disk 1
Z3 CND 22 05 Az 725 Disk between oak and balsa 1
Z3 CN 18-10 726 Shock absorbing cover top disk 1
Z3 CN 18-10 730 Sleeves for screw holes 6
Z3 CN 18-10 731 Sleeve for instrumentation wires passages (on drop mockup No. 1 shock absorbing cover only) 1 Z3 CN 18-10
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 21 / 38 NON PROPRIETARY VERSION TABLE 1-5.2 MASSES OF THE TN-MTR AND THE MOCKUP Full-scale TN-MTR Maximum mass TN-MTR 0.53 Mockup MTR-68 basket RHF Basket Mass of body 16 250 kg 2 030 kg 2 000 kg (1)
Mass of the lid:
2 700 kg 337 kg 336 kg Mass of the basket 615 kg 2150 kg 77 kg 40 kg (2)
Maximum mass of assemblies and spacers for the basket considered 2,185 kg 650 kg 273 kg Assemblies 190 kg (3)
Wedges 130 kg Mass of contents 2800 kg 350 kg 360 kg Mass of shock absorbing cover 1650 kg 206 kg 210 kg Total mass Maximum allowable mass:
23.4 t 23 400 kg 2 925 kg 2 906 kg (1): Difference due to the thickness of the outer containment plate (12 mm instead of 12.5 mm; minus 10 kg) and because there are no fins on the full scale (minus 20 kg).
(2): Difference due to the simplification of aluminium disks and because the basket is shorter.
(3): Adjusted so that the mass of assemblies per unit length is representative of the mass of full scale assemblies.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 22 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (1/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGE AND THE DROP MOCKUP TN-MTR packaging Drop model Comments Body outer containment plates (stainless steel)
Thickness: 25 mm Thickness: 12 mm The thickness should be 12.5 mm. 12 mm is a standard thickness This thickness reduction is conservative Flange (105)
Diameter:
0 1
1480 mm Diameter: 737 mm The minimum diameter under the shock absorbing cover is less than 740 mm due to ovalling of the mockup shock absorbing cover. The flange was machined to an outside diameter of 737 mm so that the shock absorbing cover can be installed. No impact on the strength of the packaging Three holes (diameter 14 mm length 20 mm) in the inside vertical face of the flange No holes Holes necessary for operation Without impact on mechanical strength Flange (105) Junction with lead Offset levels on inside and outside Same level Without impact on mechanical strength Body insulation circular shell Shell composed of 3 insulation sectors separated by three vertical balsa battens Single-piece shell To compensate for expansion of the resin Without impact on mechanical strength
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 23 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (2/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGE AND THE DROP MOCKUP TN-MTR Packaging Drop model Comments Water drains on the bearing surface of the lid flange (307)
Two drains are drilled through the flange (105)
The drains are not modelled.
The drains are drilled on an outside diameter at the seals and have no significant influence on the mechanical strength of the packaging Trunnions Trunnion screwed onto the body Trunnion welded onto the body The trunnion is not mechanically loaded during the drops Simplified trunnion shape Base diameter 244 mm Base diameter 100 mm (instead of 122 mm)
Contact surface / stop diameter:
124 mm / 144 mm Contact surface / stop diameter:
60 mm / 70 mm (instead of 62 mm / 72 mm)
The distance between the packaging axis and the end of the trunnion is respected Helium injection hole in the trunnion No helium injection hole.
Helium injection hole drilled as far as the lid inter-seal space No modification of the strength of the packaging.
Leak testing of the lid internal seal, with the shock absorbing cover in place
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 24 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (3/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGE AND THE DROP MOCKUP TN-MTR Packaging Drop mockup Comments Tie-down points Tie-down points on the outer shell at 30° from the trunnions The tie-down lug is fixed perpendicular to the axis of the trunnions The role of the tie-down lug is modelled for a lateral drop offset from the trunnions.
This confirms that the lug is not impacted regardless of the direction, for 9-metre drops.
In the case of a drop along the trunnion axes, the tie-down lugs are "protected" by the trunnions.
Lid to body attachment screw Screw diameter 30 mm Screw diameter 14 mm instead of 15 mm.
14 mm is a standard diameter This diameter reduction is conservative Washers are designed so that the core cross-section is kept and these screws do not work in shear, therefore this modification does not modify the strength of the packaging with captive washers without captive washers Lid and shock absorbing cover centring pin Diameter 34 mm Diameter 15 mm The diameter of the centring pin has been increased so that it cannot fit into a screw hole.
This has no impact on strength of the packaging Lid centring pin Height 69 mm Height 20 mm The pin height has been increased to prevent the lid from impacting the dip tube when it is put into place.
This has no impact on strength of the packaging
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 25 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (4/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGING AND THE DROP MOCKUP TN-MTR packaging Drop mockup Comments Dip tube A dip tube is put into place facing orifice B The dip tube is not
- modelled, No impact on the strength and behaviour of the packaging Dip tube low point A low point is created under the dip tube to facilitate drainage of water The point is not represented.
No modification of the strength of the packaging.
Thermal cut-outs and "Poral" disks on the packaging body Thermal cut-outs, "Poral" disks and inserts are installed on the outer shell The thermal cut-outs are not represented No modification of the strength of the packaging.
Fins Presence of fins to lower the surface temperature of the packaging No fins Simplification of manufacturing The lack of fins is conservative in drop cases Helium injection hole in the flange (105)
Hole with shoulder through the flange (105), between the outside and the lead shell.
Closed off by a 20 mm diameter test plug (312)
Straight radial hole near the bottom of the outer shell and through the resin and the lead.
Used to inject helium on the welds of the containment in order to perform leak tests These differences have no impact on the mechanical strength of the packaging Identification plates Regulatory plates and nameplates are screwed onto the fins These plates are not modelled.
No impact on the strength of the packaging
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 26 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (5/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGING AND THE DROP MOCKUP TN-MTR packaging Drop mockup Comments Basket orientation spacer The orientation of the basket is controlled by the drain tube, there is no orientation spacer A basket mockup orientation spacer is spot welded to the bottom of the cavity This spacer does not modify the strength and behaviour of the bottom of the cavity, it is designed so that it does not hinder deformation of the basket Clearance between lid and body The outside diameter of the lid above the insertion chamfer is smaller on part of the shell (306)
Constant lid outside diameter above the insertion chamfer No impact on the strength and behaviour of the packaging Orifice tubes (331) and (334)
Outside diameter with shoulder Outside diameter without shoulder No influence on the mechanical strength, considering the size of the shoulders Welds of orifice tubes (331) and (334) on the upper disk of the lid (307)
Welds offset from the mating surface Welds under the mating surface Without impact on mechanical strength
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 27 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (6/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGING AND THE DROP MOCKUP TN-MTR Packaging Drop mockup Comments First orifice on lid Plug and quick-connect coupling Staggered drilling in the orifice tube to improve protection against radiation Orifice not representative. The quick-connect coupling is replaced by the instrumentation wires and detection of helium Strength of orifices tested by the second orifice (the orifice B plug not being as strong as the orifice A plug).
Second orifice on lid Plug and cover The cover is not modelled, only the plug is.
Threaded handling holes are not modelled.
Leak tightness is obtained only by the plug and omitting the cover is mechanically conservative Orifice plug seals Inner gasket Diameter 81.93 mm Torus 5 mm Inner gasket Diameter 41.2 mm instead of 40.97 mm.
Torus 2.65 mm instead of 2.5 No influence on the leak tightness of the packaging considering the small differences.
Outer gasket Diameter 111.14 mm Torus 5 mm Outer gasket Diameter 56 mm instead of 55.6 mm.
Torus 2.65 mm instead of 2.5 Stiffener shell for the lid (305)
Shell (10 mm thick) has a diameter offset at the middle designed to limit shielding leaks.
Shell with constant cross-section (thickness 5 mm)
The strength of the shell is obtained because the cross-section at the offset is greater than the typical cross section of the shell.
Seals Seals made of EPDM Seals made of VITON No influence on the leak tightness because the hardness of the seals is similar.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 28 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (7/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGING AND THE DROP MOCKUP TN-MTR Packaging Drop mockup Comments Handling points Handling points on the lid: 12 M24 threaded holes These handling points are modelled by 10 M10 threaded holes Considering the small difference in the position of holes, the influence on the mechanical strength of the lid is negligible.
Handling points on the shock absorbing cover 4 M30 helicoils These handling points are not represented.
The handling points of the shock absorbing cover cannot be used on the mockup and the properties of the shock absorbing cover are not modified by the installation of these handling points.
Safety seals Two lugs are welded to the shock absorbing cover and 2 facing fins are drilled to receive the safety seals The lugs are not modelled, nor are the holes because the fins are not represented No impact on the strength and behaviour of the packaging Lid chamfer The outside diameter of the lid outer shell is reduced by 2 mm over a height of 140 mm The outside diameter of the lid outer shell is constant over a height of 160 mm The minimum thickness of this shell equal to 10 mm is unchanged The chamfer on part 301 of the lid is at 30° over the height of this part Chamfer from 5 to 45° No impact on the strength and behaviour of the packaging
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 29 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (8/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGING AND THE DROP MOCKUP TN-MTR packaging Drop mockup Comments Leak testplugs.
M20 plugs Fine threaded M20 plugs Should be M10 plugs. Modified for part machining reasons Chamfer for installing the shock absorbing cover on the lid A 30° chamfer is formed on the cylinder at the edge of the shock absorbing cover in contact with the body at the time that the shock absorbing cover is put into place No chamfer Very minor influence on the shock absorbing capability of the cover and on accelerations.
Shock absorbing cover drain tube Two tubes are installed to drain water falling on the central disk of the shock absorbing cover These tubes are not represented on the mockup.
No influence on the behaviour of the mockup in a drop case Sleeves for screws (730) and caps Caps are provided on these sleeves to prevent water stagnation.
These caps are not represented.
No impact on the strength and behaviour of the packaging (deceleration on the mockup will be very slightly higher)
Sleeve dimensions:
Diameter 88.9 mm Thickness 3.05 mm.
Sleeve dimensions:
Diameter 48.3 mm (instead of 44.5 mm)
Thickness 1.6 mm (instead of 1.52 mm)
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 30 / 38 NON PROPRIETARY VERSION TABLE 1-5.3 (9/9)
DESIGN DIFFERENCES BETWEEN THE TN-MTR PACKAGING AND THE DROP MOCKUP TN-MTR Packaging Drop mockup Comments Hole in the shock absorbing covers for instrumentation wires to pass through No hole in the shock absorbing cover A hole is drilled in the shock absorbing covers used for the drops Running of instrumentation wires The drop onto the shock absorbing cover during the drop on bar is made at a distance from this hole Bronze parts Bronze parts can be replaced by stainless steel parts Bronze parts according to parts list No influence on the mechanical strength, considering the size of the parts Protection gasket (370)
Gasket between the shock absorbing cover and the lid to prevent any transfer of contamination onto the body No gasket No modification to the mechanical strength of the packaging.
Resin F resin or VYAL B resin F resin No influence on the mechanical strength, considering the small thickness of the resin
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 31 / 38 NON PROPRIETARY VERSION TABLE 1-5.4 (1/2)
DESIGN DIFFERENCE BETWEEN THE MTR-68 BASKET AND THE BASKET MOCKUP MTR-68 basket Drop mockup Comments Height of basket 1064 mm 360.5 mm instead of 1064 / 2 = 532 mm.
The free height is filled in by the installation of a spacer in the cavity Position of "assemblies" in the mockup for drops and adjustment of the total mass of the drop mockup Groove for dip tube Groove for dip tube formed over the height of the basket The groove is not represented The steel thickness around the groove is more than 3 mm, therefore the strength of the adjacent compartment is higher than the strength of standard compartments (thickness more than 3 mm and locally approximately 3 mm).
This groove does not modify the dynamic behaviour of the disk and therefore the basket Handling points (11) 4 M16 threaded holes on upper disk (2) 2 M8 threaded holes (M16 full scale) on upper disk (2)
These holes are located only on the upper disk. The 1/2 scale M8 holes are representative of full scale M16 holes, the strength of the section around the holes is tested since there are two holes present. Omitting the other two holes does not improve the mechanical strength of the disk assembly and does not modify the dynamic behaviour.
Water drainage grooves Grooves formed under the basket bottom disk These grooves are not represented.
These grooves do not modify the strength or the dynamic behaviour of the basket
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 32 / 38 NON PROPRIETARY VERSION TABLE 1-5.4 (2/2)
DESIGN DIFFERENCE BETWEEN THE MTR-68 BASKET AND THE BASKET MOCKUP MTR-68 basket Drop mockup Comments Positioning keys Disk positioning keys can slide in 3 grooves formed around the periphery of the basket Disk positioning keys are placed in 4 grooves formed around the periphery of the basket and screwed onto the steel disks The keys are left free to slide on the full scale basket to allow free thermal expansion of the basket. This is not necessary for the drop mockup.
Moreover, the layout of the M3 screws does not improve the mechanical strength of the stainless steel disk Groove for centring key (6)
The groove is 14 mm x 16 mm The groove is slightly smaller:
6 mm x 6.05 mm (compared with 7 mm x 8 mm at 1/2 scale)
Negligible impact considering the size of the disks and stress areas and the intensity of forces applied to this part of the disks Conical washers Conical washers are placed at the end of the threaded rods assembling the basket There are no conical washers fitted on the threaded rods These washers enable thermal expansion of the basket disks on the full scale basket. This is not necessary on the mockup. Furthermore, this modification does not change the behaviour of the basket.
Aluminium disks Sections of aluminium disks very similar to those of stainless steel disks Aluminium disks hollowed out on the inside and centring pins fixed in the stainless steel disks Forces due to "assemblies" resisted only by the stainless steel disks
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 33 / 38 NON PROPRIETARY VERSION TABLE 1-5.5 DIFFERENCES BETWEEN THE DESIGN OF THE BASKET MOCKUP AND THE AS-BUILT MOCKUP Mockup design As-built mockup Comment Thickness of compartment cores 0
1,0 3
mm so as to remain conservative on the mockup (core thickness on full scale = 6 mm minimum) 25% of cores have a thickness of 05
,0 25
,0 3
mm Overall, the mechanical strength of the basket is not improved. It is even reduced because it is defined by the weakest elements (thickness of 2.75 mm minimum compared with 3 mm nominal)
Stainless steel Yield stress e 550 MPa, to be representative of the yield stress of the steel in the full scale basket at temperature One of the disks in the basket mockup has yield stress e = 538 MPa This is conservative.
This disk is placed at the top of the basket Compartment cores Continuous cores When the stainless steel disks were machined, two of the cores were notched and then filled with an identical metal The strength of the basket is not improved as a result.
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 34 / 38 NON PROPRIETARY VERSION TABLE 1-5.6 DIFFERENCES BETWEEN ASSEMBLIES AND THE LOAD IN THE BASKET MOCKUP TN-MTR packaging Drop mockup Comment Assemblies Assemblies MTR 2576 pins diameter 6 mm (1)
Results in a distribution of the load on the compartment in the case of a lateral drop.
(1): Number of pins: 36 in each of the 68 complete compartments (except in the 2 instrumented compartments, therefore in 66 compartments, the instrumented compartments are left empty) and 25 in the 8 partial compartments.
Mass per unit length per compartment 8 kg/m Length of a pin: 335 mm Total length of pins in the mockup: 863 m Cross-section of a pin: 28.3 mm²
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 35 / 38 NON PROPRIETARY VERSION TABLE 1-5.7 MATERIALS USED IN THE PACKAGING THE MOCKUP AND THE BALLAST TN-MTR Packaging Drop mockup Body and bottom Inner containment Type A steel (example:
Z3 CN 18-10)
Z3 CN 18-10 Shielding containment Lead Lead Insulation containment Type F resin or VYAL B resin Type F resin Outer containment Type A steel (example:
Z3 CN 18-10)
Z3 CN 18-10 Lid Inner containment Type B steel (example:
Z3 CND 22 05 Az)
Z3 CND 22 05 Az Shielding containment Lead Lead Outer containment Type K steel (example:
Z3 CND 22 05 Az)
Z3 CND 22 05 Az Seals EPDM hardness:
5 80 Shores VITON hardness:
5 80 Shores Basket Steel structural disks 17-4 PH (Z6 CNU 17 04)
Z3 CND 22 05 Az (where e = 552 MPa)
Poison disks Borated aluminium (Up to 2.5% by mass of boron)
Aluminium 6082 Content Assemblies Aluminium/Uranium Stainless steel Basket spacer in the mockup Stainless steel
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 36 / 38 NON PROPRIETARY VERSION TABLE 1-5.8 MASS PER UNIT LENGTH OF ASSEMBLIES.
Fuels Height Number of elements per compartme nt Mass per:
assembly Mass per compartme nt Mass per unit length per compartme nt
- ORPHEE, 1021 1
9 kg 9 kg 8.8 kg/m OSIRIS CARAMELS 950 1
19.4 kg 19.4 kg 20.4 kg/m HFR 672 1
< 13.7 kg
< 13.7 kg 20.4 kg/m BR-2 (type S; 200; M6) 970 1
4.1 kg 4.1 kg 4.2 kg/m 970 1
2.9 kg 2.9 kg 3 kg/m 813 1
4.1 kg 4.1 kg 5 kg/m TRIGA 762 4
3.2 kg 12.8 kg 16.8 kg/m
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 37 / 38 NON PROPRIETARY VERSION TABLE 1-5.9 TIGHTENING TORQUE FOR SCREWS IN THE MODEL Reference Designation Nominal diameter of full scale Nominal diameter of 1/2 scale Tightening torque of full scale screws (see chapter 0)
Tightening torque on the 1/2 scale mockup 150 Lid to body attachment screw M30 M14 660 N.m 70 N.m 151 Shock absorbing cover to body attachment screw M42 M20 660 N.m 70 N.m 350 Orifice plugs to lid attachment screws M12 M6 40 N.m 8 N.m
TN International Ref.: DOS-18-011415-011-NPV Rev. 1.0 Page 38 / 38 NON PROPRIETARY VERSION FIGURE 1-5.1 DIAGRAM OF THE SPACER 172 25 475 335 CG : 77