ML22277A734
| ML22277A734 | |
| Person / Time | |
|---|---|
| Site: | 07103097 |
| Issue date: | 05/23/2022 |
| From: | Boyle R, Shaw D TN Americas LLC |
| To: | Division of Fuel Management |
| Garcia-Santos N | |
| Shared Package | |
| ML22277A716 | List:
|
| References | |
| A33010, L-2022-DOT-0008 | |
| Download: ML22277A734 (38) | |
Text
Non-proprietary version Formulaire : PM04-4-MO-6E rév. 03 Orano NPS SAFETY ANALYSIS REPORT Unrestricted Orano CHAPTER 1.4 SPECIFICATION RELATING TO THE PACKAGING FCC4 Prepared by Verified by Identification :
DOS-19-021166-005-NPV Version :
1.0 Page 1 / 38 Tableofcontents Statusofrevision 2
- 1. Purpose 3
- 2. Packagingdescription 3
- 3. Specificationofweights 15
- 4. Allowablepackagingdefects 16
- 5. Definitionoffunctionalsystemsandprotectionsystemsofthepackaging 18
- 6. Materialspecifications 19
- 7. Analysisofcomponentsimportantforsafety 20
- 8. Manufacturingcontrols 21
- 9. References 23 Listoffigures 24 Listoftables 25 ListofAppendices 26
0 orano
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1.0 Page 2 of 38 Non-proprietary version Status of revision Version Date Purpose and record of revisions Prepared by / Verified by Old reference: DOS-13-00081778-040 0
04/2012 First issue Revision of chapters 3, 4.1.1 to 4.1.3, 6 and Table 71 of document TFXDC 2158 revision H.
Details added relating to content restraint Permissible packaging defects added.
Details added relating to axial clamping functions.
Details added relating to acceptance criteria for parts having a mechanical strength role, acceptance criteria for resin, compliance with 5 mm clearance.
1 09/2012 Modifications to the cross section of the cavity - from mm² to mm².
Modifications to the minimum height of the shock-absorbing balsa - from mm to mm.
Additional information, including the notion of equivalence, for shells manufactured using steel grades,,,
,, and Grade LF2 for the closure flange.
2 10/2016 Updated maximum empty weight - kg for information Update of the maximum mass of the loaded package - 5550 kg Addition of a definition for welds important to safety and the associated checks Addition of complementary proof on the acceptability of faults with the shock absorbers for loadings beyond a period of 5 years after the last periodic servicing Addition of a description of the wedging of EPR fuel assemblies with or without control cluster Addition of a description of the wedging of the smooth-walled dummies and model of EPR assemblies Integration of GAIA 14-foot assemblies Addition of steel grade screws Updated KV toughness criteria (passage from > to )
Addition for internal fitting structure and connecting pins made of, of Procurement Std Deletion of toughness requirements for the following components: pivot arm shaft; the manufacturing of part of the stabiliser pivot arm, the valve support plate, the drain sleeve, the washer holding the stabiliser arm and the cradle support bar tube Integration of the descriptions of the packaging and its fittings into Paragraph 2.
New reference: DOS-19-021166-005 1.0 See 1st page Deletion of the lubrication of the shells connection bolts possibility Details added relating to the balsa check in manufacturing Details on the surface treatment of the 10.9 grade screws Formal corrections Addition of a detail on the potential presence of mastic on the half-shells
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1.0 Page 3 of 38 Non-proprietary version
- 1.
Purpose The purpose of this Chapter is to describe the FCC4 packaging.
- 2.
Packaging description 2.1. General characteristics The packaging is shown in Figures 1.4-1 to 1.4-4.
In a general way, the FCC4 packaging is made up of:
a cylindrical, horizontally aligned enclosure, comprising two half-shells linked by flanges in a diametrical plane, a metal cradle consisting of two stringers and suspended by means of shock mounts from the lower half-shell, an internal equipment mounted on the cradle and designed to accommodate one of the content types defined in Chapter 1.3 of this report. To facilitate its loading it is able to pivot relative to the cradle and thus be placed in the vertical position (see Figure 1.4-3).
The FCC4 packaging model is made in 2 versions having different cavity cross-sections so that the internal geometry can be adapted to the geometry of the contents.
Version 1: FCC4 for type 17x17 XL, XLR, GAIA and EPR assemblies and rod channels (see drawings in Appendix 1.4-1),
Version 2: FCC4 packaging for type 16x16 and 18x18 assemblies (see drawings in Appendix 1.4-2).
These differences do not significantly affect the above description nor, under any circumstances, the components classified Important for Safety (see § 7).
The differences between the configurations are identified by the series of drawings describing them:
Packaging version Content Drawing series FCC4 V1 17x17 XL/XLR 229 K 0400 (Appendix 1.4-1) 229 K 0600 (Appendix 1.4-1) 17x17 EPR 229 K 0600 (Appendix 1.4-1) 17x17 GAIA 229 K 0600 (Appendix 1.4-1)
FCC4 V1 Adapted for transport of fuel assemblies with control clusters 17x17 EPR with control cluster 229 K 0600 (Appendix 1.4-1)
FCC4 V1 with "14-foot" type rod channels 14x14 foot Packaging:
229 K 0400 (Appendix 1.4-1) 229 K 0600 (Appendix 1.4-1)
FCC4 rod box:
47-0-01-99-01-00 sheet 2/2 (Appendix 1.3-2) 14x14 foot 15x15.
16x16.
17x17 foot 17x17 XL/XLR/GAIA 18x18.
17x17 EPR Packaging:
229 K 0400 (Appendix 1.4-1) 229 K 0600 (Appendix 1.4-1)
EPR rod box:
PLA-11-00053656-000 (Appendix 1.3-2)
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1.0 Page 4 of 38 Non-proprietary version FCC4 V2 16x16 18x18 229 K 0500 (Appendix 1.4-2)
Photographs of the FCC4 packaging are given in Appendix 1.4-4.
2.2. Outline dimensions Maximum overall dimensions:
Length: 5,748 mm Width: 1,134 mm Height: 1,297 mm 2.3. Description of sub-assemblies Details of the sub-assemblies and the associated parts lists are given in Appendices 1.4-1 and 1.4-2. These parts lists include for each unit all constituent elements of the packaging, some of which are identified as Important for Safety in Section 7. The important elements are grouped together on drawings specific to each of the packagings and designated "Safety Drawings".
Table 1.4-5 specifies the list of packaging welds important for safety (location, type of weld, type of inspection).
Moreover, the other welds featured by the different components of the packaging (shell, frame, door, etc.) are not detailed in Table 1.4-5 insofar as they play an assembling role.
2.3.1. Lower shell The lower shell forms the base of the packaging and is made up of the following components:
2 steel plates, mm thick, in the shape of a half-cylinder and butt-welded, 2 steel plate ends - mm thick, reinforcements in the form of liners and gusset plates together with vertical flats mm thick, each with a hooking point for handling the packaging, and horizontal reinforcement
- flats, 2 stringers braced by "U" sections and angle bars which enable the enclosure to rest on the ground on 4 metal skids and to be capable of being handled by fork lift truck, 2 folded plates, mm thick, forming the supports for the shock mounts which link the internal system to the shell, a special angle bar joining the lower shell to the upper shell by means of bolts secured by a tightening torque between N.m and N.m.
stabilizer arms designed to increase the stability of the shell when the frame is in the vertical position (Figure 1.4-3).
Mastic can be present on the lower shell, notably on the welds.
Note: The handling of the packaging, empty or loaded, can be performed either by means of the lifting points on the lower shell or by those on the upper shell.
2.3.2. Upper shell The upper shell forms the packaging lid and is made up of the following components:
2 steel plates, mm thick, in the shape of a half-cylinder and butt-welded, 2 steel plate ends, mm thick, to which are attached two axial shock absorbers, reinforcements in the form of radial angle bars and plates mm thick,
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1.0 Page 5 of 38 Non-proprietary version an angle bar acting as a connecting flange between the lower shell and the upper shell.
This upper shell is equipped with 4 storage stands, each one equipped with a handling point for the upper shell and/or the package.
The ends of the FCC4 packaging lifting boxes are either open or closed, as far as the handling hole, by plates.
Thus, as of 2007, the holes of the manufactured packagings are closed by plates.
End blanking plate Closure plate at the handling hole
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1.0 Page 6 of 38 Non-proprietary version The upper faces of these stands are equipped with centering pins which allows stacking.
Mastic can be present on the upper shell, notably on the welds.
2.3.3. Cradle The cradle supports the frame when the latter is in the horizontal position. It is made up of the following components:
stringers and cross-pieces connected to the lower shell via shock mounts, a system for locking the internal equipment in the vertical position, comprising a pivoting support leg, a guide rail and a locking mechanism, a bottom side end featuring bearing supports designed to accommodate the pivots for tilting the frame, yokes for the clevis pins of the eye swing bolts for securing the internal equipment to the cradle.
2.3.4. Internal system - frame and doors It is made up of the following components:
a support frame whose rigid structure in the form of an inverted "T" is designed to support the contents horizontally. The fabricated part of the frame contains neutron-absorbing resin.
a bottom plate screwed to the frame and supporting the fuel assemblies during loading and unloading when the frame is in the vertical position. This bottom plate can be adapted to provide axial clamping of the assembly at its bottom nozzle by means of holding claws that are capable of moving and engaging in the shoulders of the bottom nozzle legs.
a two-part top plate for closing off the cavities and wedging the contents at the other end.
This top plate is adapted to provide axial clamping of the fuel assembly or the control cluster by means of a pad mounted at the centre of the top plate and which bears on the upper nozzle or the hub of the control cluster by means of a threaded rod, two L-shaped doors containing neutron-absorbing resin. These doors pivot on hinge pins connected to the frame and close to seal off the contents. For the transportation of EPR fuel assemblies, which the grid positions are slightly offset compared with the other 17x17 (XL, XLR & GAIA) fuel assemblies, doors suitably adapted to EPR fuel assemblies are necessary. These doors are detailed in drawing series 229 K 0600 (see Appendix 1.4-1).
The internal equipment system therefore leaves space for two cavities for housing the assemblies and/or fuel rod channels. These cavities, referred to as "neutron cavities", have a cross-section exactly fitting the contents.
There are two cavity cross-sections which define the two FCC4 packaging versions referred to in the introduction:
Cross-section of mm² for type 17x17 fuel assemblies and rod channels:
Version 1, Cross-section of mm² for type 16x16 and 18x18 fuel assemblies: Version 2.
Each internal system is marked to identify the version type.
Note: these cavities are protected against bursting due to possible temperature rise by the presence of vent holes positioned in accordance with safety drawings 229 K 0402 and 229 K 0502 and 229 K 0602 in Appendices 1.4-1 and 1.4-2.
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1.0 Page 7 of 38 Non-proprietary version By virtue of this design, the internal system performs the following functions:
containment of the fuel rods within a volume whose cross-section is maintained. This is achieved by means of the frame, doors and plates, neutronic decoupling limiting the interactions between the two assemblies or between packages, through the absorbing action of the resin contained in the doors and frame.
2.3.5. Equipment for the transportation of EPR assemblies in a Version 1 FCC4 packaging Adaptations have been made to transport EPR fuel assemblies with control clusters.
These modifications affect only the FCC4 packaging version 1.
Axial hold down of the control clusters The control clusters are transported with their rods inserted into the fuel assembly guide tubes.
To maintain the cluster in place and prevent its movement relative to the fuel assembly, it is pressed against the top nozzle of the assembly by a support system positioned in the centre of the top plate. This system consists of a screw connection and a bearing pad on the hub of the control cluster.
Because of the fact that the control cluster extends beyond the length of the cavity, a protrusion on the top plate is necessary to house and retain its hub.
To overcome the problems posed by this protrusion, a second shock absorber filled with balsa wood is fitted to each of the 2 top plates around the respective protrusion.
This modification to the FCC4 packaging (see drawings 229 K 600 and following drawings in Appendix 1.4-1 of the FCC4 report) produces a cylindrical protrusion with a height of mm.
2.3.5.1.
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1.0 Page 8 of 38 Non-proprietary version The shock absorber covers not only this protrusion but also the ends of the bolts when the cluster is clamped so that no element projects beyond it. The absence of any protrusion facilitates the fitting of the lid which bears the shock absorbers and avoids any damage to them. It contains a minimum thickness of mm of balsa wood.
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1.0 Page 9 of 38 Non-proprietary version Axial hold down of the assemblies via the bottom nozzle Axial hold down of assemblies without cluster is accomplished by means of a pad mounted at the centre of the top plate which bears on the adaptor plate of the top nozzle.
Given the presence of the cluster and its restraint system at the centre of the top plate, an assembly with cluster is restrained via the bottom nozzle. This involves clamping the legs of the bottom nozzle of the assembly against a new bottom plate by means of eight retaining claws. In order to take up a position above the shoulder of the bottom nozzle leg, the claws are able to move by means of sliding connections on the bottom plate. The slide enables the retaining claw system to move and to close off the oblong hole in the top plate of the internal equipment whether the system is in the open or closed position.
Two indexed positions are possible:
a retracted position allowing removal of the nozzle, a position covering the shoulder of the nozzle leg.
Movement between these positions is provided by indexing pins.
The pressing action of the bottom nozzle against the top plate is provided by screw connections comprising an M8 clamping bolt and a captive nut on the bottom plate.
These adaptations are applicable in the case of transportation of EPR assemblies equipped with cluster.
2.3.5.2.
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1.0 Page 10 of 38 Non-proprietary version Fuel assembly wedging system The wedging system comprises a base plate on which four bevelled cylinders are welded at each corner so as to fit into the square cross-section of the cavity. The plate is fixed to the top plate by screws. The height of the spacer is mm.
2.3.5.3.
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1.0 Page 11 of 38 Non-proprietary version The wedging system may or may not be removed during transport of the fuel assembly without cluster in the case of a packaging equipped with top plates with protrusion for transporting the control cluster.
This variant of the top plate including the wedging system affects only FCC4 packagings version 1, dedicated to the transportation of EPR assemblies.
Hold down of EPR assembly grids EPR fuel assembly grids are not positioned at the same altitudes as the grids of XL/GAIA and XLR type assemblies. Special doors (229 K 0670 in Appendix 1.4-1 of the FCC4 report) replace the conventional doors (229 K 0497 in Appendix 1.4-1 of the FCC4 report). The impact of the grids offset on the doors is treated in the same way as for the XLR assemblies which are transported with the conventional doors.
Certain intermediate ribs on the doors incorporate shoulders to accommodate a second pad position. Certain stamped features are wider ( mm instead of mm).
These modifications only affect FCC4 containers in version 1.
2.3.5.4.
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1.0 Page 12 of 38 Non-proprietary version 2.3.6. Equipment for the transportation of a smooth-walled dummy assembly and a fuel assembly with cluster in an FCC4 Version 1 packaging (Series 600)
During the transportation of an assembly with cluster and a smooth walled dummy in an FCC4 Version 1 packaging (Series 600), adaptations are required for the cavity housing the dummy assembly.
Radial wedging of the smooth-walled dummy Taking into account the fact that its uninterrupted section is slightly inferior to the fuel assembly, two top and bottom spacers are used to centre the dummy within the cavity. The radial wedging of the dummy is achieved by the tightening of a top pad and a bottom pad, bringing them in contact with the smooth walls of the dummy, with the pads being positioned in the dish of the spacers (see figure below); thus they are prevented from moving longitudinally.
Radial wedging of the dummy assembly 2.3.6.1.
Cales Spocer Embout inferieur Bottom nozzle
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1.0 Page 13 of 38 Non-proprietary version Axial wedging of the smooth-walled dummy or assembly model Bottom clamping:
The clamping of the smooth-walled dummy is identical to that of a fuel assembly without cluster and clamped at the top of the assembly, also without base clamping as detailed in Paragraph 2.3.6 (Option 1) of this chapter.
Top wedging:
The wedging system is detailed generically in this Section (2.3.6). It is similar to that of the EPR assemblies with cluster, notably in terms of:
The thickness of the top plate ( mm);
The dimensions and properties of the balsa filling the shock absorbing casing in the top plate (crush restriction of balsa is MPa +/- MPa as detailed in Table 1.4-1 of this chapter).
Nevertheless, the holding screw of the cluster hub is replaced by a longer screw (bolted to the centre of the top plate) and a pad which is brought in contact on the upper nozzle of the smooth-walled dummy.
Drawing of smooth-walled dummy or fuel assembly model clamping system (for a fuel assembly model) 2.3.7. Content restraint system Radial restraint of the package content is provided by the door pads which bear on the grids of the transported assembly. For each serie of packaging drawings (see § 2.1), the pad positions are defined in relation to grid positions of the transported assemblies or the assembly model and smooth-walled dummy.
Axial hold down of the contents can be accomplished in 3 different ways:
2.3.6.2.
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1.0 Page 14 of 38 Non-proprietary version Assemblies, dummies or assembly model transported without control cluster (option 1, all drawing series):
Axial hold down can be provided via the top nozzle of the assembly by means of a pad mounted at the centre of each of the top plates and which bears on the top nozzle adapter plate by means of a threaded rod. The assemblies are thus pressed against the bottom plate. Within the cavity housing the smooth-walled dummy, the lateral clamping is applied as detailed in Paragraph 2.3.6.1.
Assemblies transported without control cluster (option 2, drawing series 229 K 0600):
Axial hold down can be provided via the bottom nozzle of the assembly be pressing the ends of the bottom nozzle of the assembly against the bottom plate by means of holding claws, at the rate of two per assembly leg, inserted into the bottom plate. These claws are able to move and engage in the shoulders of the bottom nozzle legs. This pressing action is provided by screwed connections. In this case, the top plates are not fitted with pads.
Assemblies transported with control cluster (drawing series 229 K 0600):
Axial hold down of the assemblies is provided in the manner described in the previous section.
Axial hold down of the cluster is provided by pressing the cluster against the upper nozzle of the assembly by means of a pad mounted at the centre of the top plate and bearing on the hub of the cluster.
An additional wedging system for the fuel assembly is set up between the top plate and the upper nozzle of the assembly. This wedging system comprises a base plate at each corner of which are welded four cylinders bevelled so as to fit into the square cross-section of the cavity.
The plate is fixed to the top plate by M10 screws.
Transportation of a fuel assembly with cluster and a smooth-walled dummy or fuel assembly model without cluster (drawing series 229 K 0600):
In order to ensure axial clamping of the smooth-walled dummy and the EPR assembly model in the cavity housing the dummy or model, the bottom plate is placed in an non-clustered configuration. At the top, the EPR top plate, as described previously (see paragraph 2.3.5.3) is preserved for reasons of symmetry during the crushing of the top shock absorber during accidental conditions of transport. Nevertheless, the holding screw of the control cluster hub is replaced by a longer screw and a pad (fitted to the centre of the top plate) pressing against the hub.
Assembly drawings of the restraint systems are given in paragraphs 2.3.5 and 2.3.6.
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1.0 Page 15 of 38 Non-proprietary version 2.3.8. Support leg locking nut restraining system A locknut/welded nut system, on a threaded rod, is used to adjust the travel of the support leg, needed to adjust the verticality of the internal fitting.
The packaging model also presents a variation on the support leg adjustment system, which involves the presence of a longer threaded rod, drilled through for the insertion of a dowel pin, forming a mechanical stop.
- 3.
Specification of weights In order to ensure compliance with regulatory requirements as demonstrated in this report, the maximum weight of the loaded packaging must be less than 5,550 kg.
The maximum suspended weight of the packaging (internal system excluding content) is verified during the manufacturing of the packaging. This value must be consistent with the values considered in the selection of drop configurations for prototype 2, as follows:
1,790 kg for 17x17 arrays, 1,982 kg for 16x16 and 18x18 arrays.
For guidance, the maximum empty weight is kg.
Support leg Welded nut Locking nut Threaded rod Threaded rod Dowel pin position Locking nut
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1.0 Page 16 of 38 Non-proprietary version
- 4.
Allowable packaging defects 4.1. Dents on the enclosure Length of defect: L Width: l =
Smallest dimension of defect Shape defect =
depth: p Sideview Frontview Local deformations on the container shell are acceptable, provided that:
The affected surface area is less than 200 cm2 per dent:
200
l L
cm2 ;
and if the ratio of width to depth of the dent exceeds 2:
2
p l
and no cracking is detectable visually in the affected area.
4.2. Deformations of reinforcements and gripping zones Shape defect: d Width: l =
smallest dimension of defect Thickness: e Deformations of angle bars, fork pockets, lifting boxes and other reinforcements are acceptable provided that:
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1.0 Page 17 of 38 Non-proprietary version the ratio of the smallest deformed dimension (width) to the shape defect is greater than 2:
2
d l
the ratio of the shape defect to the thickness of the affected part is less than 2 :
2
e d
and the length of the defect is less than 100 mm: L < 100 mm; and the defect does not extend to any welds, or areas 50 mm from welds in the case of lifting boxes; and no cracking is visible on visual inspection.
4.3. Shock absorbers Damage to a shock absorber is acceptable provided that:
the affected surface area is less than 100 cm2 per dent; the defect depth is less than 8 mm; and the defect is not through-wall, i.e. the ratio of the dent width to depth is greater than 2.
In addition, for loadings after a period of over 5 years from the last periodic servicing, checks must be undertaken to verify the absence of cracking on the visible faces of the shock absorbers.
In the event that traces of impacts are noticed, a deeper analysis must be carried out on the absorber in order to check for the absence of fissures by a surface test (type - dye penetrant).
4.4. Justification of acceptability of these defects Compliance with the criteria specified above ensures the absence of changes in the behaviour of the FCC4 package in routine, normal and accident conditions of transport for the following reasons:
The allowable defects do not compromise the operation of the packaging.
Allowable defects of the outer enclosure: the allowable defects do not change the behaviour of the packaging during tests representative of normal and accident conditions of transport. They are too localised and limited in scale to have an impact on the overall behaviour of the package.
In particular, the deformation is too limited to produce a reduction in the thickness of the shell and therefore to compromise its resistance to the perforation test. Similarly, the damage produced by free drops representative of normal and accident conditions of transport stress the whole surface area of the shell whereas the allowable deformations are very localised; neither the restriction nor the strength of the shell to impacts, are modified. In addition, in the case of dropping onto a bar, the shell will be systematically perforated.
Allowable defects in reinforcements and gripping zones: limited warping of the half-shell reinforcements and the gripping zones has very limited impact on the centre of inertia of these components and does not alter the mechanical behaviour of the packaging in drop conditions.
Allowable defects in the shock absorbers: in the context of Accident Conditions of Transport, the vertical drop test shows that the impact of the internal equipment on the shock absorber produces a mm dent on a cm² section. Given the specified requirement for allowable defects in shock absorbers, i.e. an 8 mm dent on a 100 mm² section, the allowable defect will
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1.0 Page 18 of 38 Non-proprietary version have no impact on the mechanical behaviour of the absorbers and their capacity to store energy during a vertical drop.
Thus the allowable deformation criteria for the components referred to in paragraphs 4.1 to 4.3 are consistent with safety requirements.
- 5.
Definition of functional systems and protection systems of the packaging 5.1. Closing system The two half-shells are connected by flanges: a specially-designed angle bar on the lower half-shell is used to fit the bolts joining the two cylinders.
The doors and top plates are connected to the frame using ball-lock pins. The bottom plate is screwed to the frame.
5.2. Shock absorbing systems Two axial shock absorbers are fitted to the end of the upper shell. They are made up of two metallic boxes containing a block of balsa wood.
For the transportation of assemblies with control clusters, the top plates each incorporate an additional shock absorber each comprising a metal box containing a block of balsa wood.
5.3. Handling and tie-down elements Handling can be performed under normal safety conditions using standard lifting gear, using a suitable lifting beam or slings fitted with shackles or hooks. Three lifting modes are possible:
Using the 4 lifting boxes, welded onto the upper shell, for the handling of the loaded or empty package and the lid alone during opening operations: these lifting boxes comprise a folded plate with a hole in it for a shackle or a hook; by means of 4 lifting boxes welded on the lower shell, for handling the loaded or empty package; by means of fork-lift pockets provided under the lower shell for handling the loaded or empty package.
Furthermore, the packaging is also designed to be suitably tied down during transport.
5.4. Containement system In the design of FCC4 package model, confinement of the fissile material is provided by the fuel rod cladding and the zirconium alloy welded plugs, as described in Chapter 1.3 of this report.
5.5. Isolation system The isolation system for the packaging part is provided by the container structure which is made up of the following components:
internal equipment comprising frame, doors and end plates, the assembly as a whole forming two neutron cavities. Regulatory drop tests and thermal tests (see Chapters 2.1 and 2.2 of this report) show that its geometry is not modified in accident conditions of transport. The internal system performs the following functions:
limitation of neutron interaction between fuel assemblies or rod boxes and between packages.
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1.0 Page 19 of 38 Non-proprietary version control of the moderation of the fissile material contained in the neutron cavity by limitation of its volume.
The neutron-absorbing resin contained in the doors and frame. The characteristics of this material are given in Table 1.4-1. Following the regulatory thermal test the resin retains its absorbent properties and a sufficient thickness to ensure the sub-criticality of the package array in accident conditions (Chapter 2-5 of this Report).
The upper and lower half-shells ensuring the protection of the internal system during normal and accidental transport conditions (NCT and ACT). Following the regulatory drop tests (Chapter 2-1 of this Report), the two half-shells remain attached together and show only very slight deformation. They thus help to limit interactions between the packages by containing the neutronic cavities within their volume.
In the case of fissile material, the isolation system is formed by the following elements:
The physical form of the fissile material: sintered UO2 pellets and/or a mix of UO2 and material acting as neutron poison; The cladding tubes: ensuring fissile material confinement in accident conditions; During transportation of fuel assemblies:
The structure of the assembly (grids, nozzles). This structure defines and limits the volume occupied by the fissile material. The statutory drop tests results showed a general compaction of the array following a drop, apart from a possible expansion of the array at the last grid span (in the case of vertical drop).
Completeness of the assemblies: any missing fissile rods are replaced by inert rods.
For the transportation of rods in rods box: the rods box as well as the axial and longitudinal wedging systems.
The minimal characteristics of the fissile material constituents are given in Chapter 1.3 of this Report.
5.6. Mechanical protection system The two half-shells and the internal equipment system (door/frame assembly) provide mechanical protection in normal and accident conditions of transport. The mechanical tests performed on the package have shown that no rod in the assembly can break under accident conditions of transport.
5.7. Thermal protection system Fire protection is provided by the two half-shells, the internal equipment system and the resin contained in the doors and frame. This resin also makes it possible to protect the containment system from the effects of the temperatures prevailing under accident conditions of transport.
- 6.
Material specifications The numerical values given in Table 1.3-1 are the values guaranteed by the applicable AFNOR standards. The containers will be built in accordance with the standards in force at the time of their manufacturing.
Note also that the specified AFNOR grades may be replaced by grades with at least equivalent mechanical properties. For each type of steel used in the manufacturing of Elements Important for Safety, a verification is undertaken for the absence of brittle fractures at -40°C. In addition, toughness
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1.0 Page 20 of 38 Non-proprietary version tests are carried out at a temperature of -40°C on samples of () steel taken from 12-foot containers. These tests showed that there was no brittle failure; a summary of these tests is given in Appendix 1.4-3.
The whole of the door-frame assembly is made of austenitic stainless steel. Toughness at low temperature is an intrinsic characteristic of this material. No further guarantee is needed for this structure.
For fasteners of quality grade 10.9, the material grade is chosen from those proposed in standard
, reference <1>.
In addition, the procurement requirements for bolts will include a guaranteed toughness value at
-40 °C by means of specific product tests, in accordance with, reference Erreur !
Source du renvoi introuvable..
The main materials used for construction of the packaging components are listed in Table 1.4-1.
Unless otherwise stated, the properties are given for a temperature range of [-40 °C; +38 °C].
The thermal properties of the materials (steel and resin) are detailed in Appendix 2.2-1.
Procurement requirements for the materials are specified in Table 1.4-4.
- 7.
Analysis of components important for safety The Components Important for Safety (CIS) for the FCC4 packaging are as follows:
The analysis attached in Tables 1.4-2 and 1.4-3 shows that all of the Components Important for Safety (CIS) continue to perform their functions after three successive drops (two drops onto a bar and one 9 m flat drop were carried out). Table 1.4-2 describes the main failure modes of the CIS, prior to the regulatory tests, and their effects on the assembly and the package. Table 1.4-3 draws a parallel between the condition of the package on completion of the regulatory tests and the assumptions made in the criticality studies for the Components Important for Safety.
The frame-door assembly suffered some damage during the mechanical tests. However, the successive drops resulted in an overall constriction of the cavity which is a favourable factor in terms of criticality. The tearing of the doors is the cumulative result of the two drops onto a bar, which
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1.0 Page 21 of 38 Non-proprietary version targeted the same impact point on the door containing the assembly. However, the thickness of the resin is unaffected and the neutron protection function remains unimpaired.
No fuel rod is ruptured on completion of these mechanical tests. The containment system formed by the rod cladding and the welded plugs remains intact and continues to provide the confinement function. Likewise, despite the impacts of the various drops, the internal equipment continues to provide protection for the assemblies as all the door/frame/top and bottom plate connections remained intact during the drops.
These results show that the assumptions made in the criticality studies are valid.
It will be noted that the axial restraint of the assembly is rated at g to withstand routine transport conditions.
- 8.
Manufacturing controls Design and manufacturing criteria associated with the Components Important for Safety are comprehensively described in Table 1.4-4.
The manufacturing process for the resin is qualified and guarantees compliance with the criteria for content ( %), thermal conductivity ( W/(m.K) at 160 °C) and heat capacity
( J/(g.°C) at 160 °C). These parameters are not monitored in each production run.
Some of the criteria in Table 1.4-4 are detailed below.
8.1. Components having a mechanical strength role In the case of components for which mechanical strength is required, a minimum thickness of material having minimum mechanical characteristics (Re, Rm) are required. Acceptance for these components are based on the loading mode of the components with reference to the actual mechanical properties and measured thicknesses of the material.
For components subjected to tensile/shear loads, the acceptance criteria are as follows:
This mode of treatment applies to the following components:
For components subjected to bending loads, the acceptance criteria are as follows:
This mode of treatment applies to the following components:
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1.0 Page 22 of 38 Non-proprietary version 8.2.
10.9 grade steel screws The surface treatment on 10.9 grade screws (connecting half-shells screws and cradle fixing screws on the frame) is a coating according to the norm <8>, which excludes any risk of hydrogen embrittlement.
8.3. Resin Acceptance criteria for the resin in terms of chemical composition are associated with the number of atoms of hydrogen and boron to be taken into account in the criticality safety studies (see Chapter 2.5 of this Report). The criticality-safety studies take into account a hydrogen content of % and a boron content of % associated with a density of.
The number of atoms is calculated by the following formula:
H A
M N
X d
)
H
(
N
Where: d density of resin;
%X hydrogen or boron content of resin; A
N Avogadro's number; H
M molar mass of hydrogen or boron.
Given that the Avogadro's number and the molar mass of hydrogen or boron are fixed in this formula, the acceptance criteria for the resin are:
for hydrogen content and for boron content.
8.4.
Balsa After storage and before its crating, the humidity control (between % and % at ambient temperature) is performed. The measure method is based on 9 samples:
3 samples at -40°C, 3 samples at ambient temperature, And 3 samples at +70°C.
For each temperature of test, the average plateau crushing stress on the 3 samples must be included between and MPa.
8.5. Door/frame clearance greater than mm Table 1.4-4 indicates that the maximum gap between doors and frame is mm. It is permissible to place a mm diameter round welded at mm intervals over a minimum length of mm in order to comply with this criterion, as shown schematically below:
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1.0 Page 23 of 38 Non-proprietary version 8.6. Weld tests The verification of the packaging welds important for safety, during manufacturing, as described in Table 1.4-1, is carried out as per CODAP or another equivalent code.
The inspection criteria meet or are equivalent to the following:
Visual inspection: A visual inspection and recording, as per CODAP - 2005 - Section I Appendix I1.A1 criteria from CODAP Section I, tables I1.A1-1 and I1.A1-2 for Category A; Dye penetrant testing - no notable faults: no notable indication as per Table I1.A2.2 of CODAP - 2005 - Section I Appendix I1.A2; Inspection by white dye penetrant: Dye penetrant testing and recording as per CODAP -
2005 - Section I Appendix I1.A2, criteria: white dye penetrant, no indications regardless of size; Dye penetrant inspection : Dye penetrant inspection and recording, as per CODAP - 2005 -
Section I Appendix I1.A2 criteria from CODAP Section I, table I1.A2.2 for Category A;
- 9.
References
<1>
<2>
<3>
<4>
<5>
<6>
<7>
<8>
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1.0 Page 24 of 38 Non-proprietary version List of figures Figure Title Number of pages 1.4-1 FCC4 packaging - General view with container closed 1
1.4-2 FCC4 packaging - Arrangement of assemblies 1
1.4-3 FCC4 packaging - General view with container open and frame in vertical position 1
1.4-4 Illustration of the FCC4 packaging 1
TOTAL 4
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1.0 Page 25 of 38 Non-proprietary version List of tables Table Title Number of pages 1.4-1 Characteristics of the FCC4 packaging material 1
1.4-2 General analysis of functions important for safety 3
1.4-3 Analysis of components important for safety during regulatory tests 2
1.4-4 Components conformity table 9
1.4-5 List of welds important for the safety of the packaging 12 TOTAL 27
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1.0 Page 26 of 38 Non-proprietary version List of Appendices Appendix Title Number of pages 1.4-1 Appendix 1.4-1 DOS-19-021166-009 "Drawings of the FCC4 packaging (version 1)"
2 1.4-2 Appendix 1.4-2 DOS-13-00081778-042 "Drawings of the FCC4 packaging (version 2)"
2 1.4-3 Document FFDC 01079 revision A "Summary of toughness tests" 2+4 1.4-4 Appendix 1.4-4 DOS-13-00081778-044 "Photographs of the FCC4 packaging" 2+3 1.4-5 Appendix 1.4-5 DOS-19-021166-010 Analysis of the ageing mechanisms of the FCC3 and FCC4 package models 6
TOTAL 21
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Manufacturer's plate left
~
I I
I
~
~lo~~ ----o
~
l::.-:
I' I
I XXX
- -l
=
o
/
!FIH:FE ~
=
L-.....1 5740 Content incli:catm'S 0
~
Foot.
~
o----
~l.R:IC.I LFI'.....
~
... --- A I
XXX t
~
'=
I L......J I
I I
left 113()
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m f"-'
0
_I
~!:i,tlU
~I Hl:Nt:.
D
~
XXX
-- A I ~-
a i 1*
- 'C I i I
J!,,
/
L..-1 Upp-ersh@U Left-hand door Ncmtron-abs.o Support frame Low@r s!hell Support pad LEVER t::I LFT I-EFE ~
SECTIONAL VIE\\f\\l A-A t
{I u...
Ri ght~han.d door Fuel ass@mbly 5hodk absorb@!"
~Kl LJl"I ttiU:
XXX i.:= t
~,d ll!Xibl@ shock mount
~
Gradl@
~
b, I
I
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~
Top pla,te Support trame A
left right Support leg 1 l::'::::f~
Bottom plate l
Foot VIEWa.cc..A Cradle Foot f le"xible sho~k mou11t LILI -:7 D D
D C7 C7 C7 C7 [7 D D 57) 1 lj Stabiliser I:[
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1.0 Page 31 of 38 Non-proprietary version Table 1.4-1 Characteristics of the FCC4 packaging material
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General analysis of functions important for safety
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General analysis of functions important for safety
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General analysis of functions important for safety
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Analysis of components important for safety during regulatory tests
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Analysis of components important for safety during regulatory tests
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1.0 Page 38 of 38 Non-proprietary version Table 1.4-5 List of welds important to the safety of the packaging