ML22271A486
| ML22271A486 | |
| Person / Time | |
|---|---|
| Site: | Orano USA |
| Issue date: | 08/18/2022 |
| From: | Shaw D Orano USA |
| To: | Division of Fuel Management |
| Garcia-Santos N | |
| Shared Package | |
| ML22271A128 | List:
|
| References | |
| A33010, EPID L-2022-DOT-0007 | |
| Download: ML22271A486 (39) | |
Text
Orano NPS Unrestricted Orano
SAFETY ANALYSIS CHAPTER 1.4 REPORT SPECIFICATIONS RELATING TO THE PACKAGING
Prepared by / signature 0 orano FCC3 Verified by / signature
Identification : DOS-19-021165-005-NPV Version : 1.0 Page 1 / 39
Tableofcontents Statusofrevision 2
- 1. Purpose 3
- 2. Packagingdescription 3
- 3. Specificationofweights 13
- 4. Allowablepackagingdefects 14
- 5. Definitionoffunctionalsystemsandprotectionsystemsofthepackaging 16
- 6. Materialspecifications 17
- 7. Analysisofcomponentsimportantforsafety 18
- 8. Manufacturingcontrols 19
- 9. References 21 Listoffigures 22 Listoftables 23 ListofAppendices 24
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 2 of 39
Status of revision
Version Date Purpose and record of revisions Prepared by / Verified by
Old reference: DOS-13-00081778-040
First issue Revision of chapters 3, 4.1.1 to 4.1.3, 6 and Table 7-1 of document TFXDC 2159 revision G.
0 04/2012 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.
Modifications to the cross section of the cavity - from mm² to mm².
Modifications to the minimum height of the shock-absorbing balsa - from 1 09/2012 mm to mm.
Additional information, including the notion of equivalence, for shells manufactured using steel grades,,,,
, and de LFfo r closurflange.
Addition of a definition for welds important to safety and the associated checks Addition of steel grade screws Addition of internal fitting structure, including connecting pins in from Procurement Std 2 10/26 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 in Paragraph 2.
New reference: DOS-19-021165-005
Deletion of the lubrication of the shells connection bolts possibility Details added relating to the balsa check during manufacturing 1.0 See 1st page Details on the surface treatment of the grade screws Formal corrections Addition of a detail on the potential presence of mastic on the half-shells
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 3 of 39
- 1. Purpose
The purpose of this chapter is to describe the FCC3 packaging.
- 2. Packaging description
2.1. General characteristics
The packaging is shown in Figures 1.4-1 to 1.4-5.
In a general way, the FCC3 packaging is made up of:
a cylindrical, horizontally aligned enclosure, co mprising two half-shells linked by flanges in a diametrical plane;
a metal cradle consisting of two stringer s 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 repor t. 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 FCC3 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: FCC3 packaging for 15x15 and 17x17 12-foot assemblies and 12-foot rod channels (see drawings in Appendix 1.4-1);
Version 2: FCC3 packaging for 14x14 assemblies (see drawings in Appendix 1.4-2).
These differences do not significantly affect the above description nor, under any circumstances, the Components classifi ed Important for Safety (see § 7).
The differences between the configurations are i dentified by the series of drawings describing them:
Packaging version Content Drawing series
FCC3 V1 17x17 foot 229 K 0100 (Appendix 1.4-1) 15x15 foot 229 K 0200 (Appendix 1.4-1)
FCC3 V1 17x17 foot Adapted for transport of fuel with control 229 K 0700 (Appendix 1.4-1) assemblies with control clusters cluster 14x14 foot Packaging:
14x14 foot 229 K 0100 (Appendix 1.4-1)
FCC3 V1 15x15 229 K 0200 (Appendix 1.4-1)
With "12-foot" type rod 229 K 0700 (Appendix 1.4-1) channels 17x17 foot FCC3 rod box:
47-0-01-99-01-00 sheet 1/2 (Appendix 1.3-2)
FCC3 V2 14x14 foot 14x14 foot 229 K 0300 (Appendix 1.4-2)
Photographs of the FCC3 packaging are given in Appendix 1.4-4.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 4 of 39
2.2. Outline dimensions
Maximum overall dimensions:
Length: 4,931 mm
Width: 1,145 mm
Height: 1,217 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 al l constituent elements of the packaging, some of which are identified as Important for Safe ty 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 diffe rent 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 6 radial angl e bars joined to 8 vertical gusset plates and flats mm thick;
2 stringers braced by "U" sections and angl e 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 fo r the shock mounts which link the internal system to the shell;
A special angle bar joining the lower s hell to the upper shell by means of bolts secured by a tightening torque of 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.
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;
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 5 of 39
an angle bar acting as a connecting fl ange between the lower shell and the upper shell;
4 storage supports, each one with a handling point for the upper shell and/or the package; the upper faces of these supports are fitted with positioning pins for stacking; a plug can be fitted to certain handling holes.
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 7 cross-pieces connected to the lower shell by shock mounts;
a system for blocking 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 swin g bolts 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 fabric ated 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 vertic al position. This bottom plate can be adapted to provide axial clamping of the asse mbly at its bottom nozzle by means of holding claws that are capable of moving to engage with 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 ax ial 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.
The internal equipment system therefore leav es space for two cavities for housing the assemblies and/or fuel rod channels. These cavi ties, referred to as "neutron cavity", have a cross-section exactly fitting the contents.
There are two cavity cross-sections which define the two FCC3 packaging versions referred to in the introduction:
cross-section of mm² for type 15 x 15 and 17 x 17 assemblies and 12-foot fuel rod channels: Version 1;
cross-section of mm2 for type 14 x 14 - 8 and 10-foot assemblies:
Version 2.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 6 of 39
Each internal system is mark ed 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 0102 and 229 K 0202, 229 K 0302 and 229 K 702 in Appendices 1.4-1 and 1.4-2.
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 interacti ons between the two assemblies or between packages, through the absorbing action of t he resin contained in the doors and frame.
2.3.5. Packaging configuration for transporting fuel assemblies with control clusters The transportation of 17x17 foot fuel assemblies with control clusters inserted requires adaptation of the packaging to make it compatible with the dimensions of the contents and to adapt the contents/packaging interfaces. These adaptations give rise to the configuration described in the drawing series 229 K 0700 (see Appendix 1.4-1).
These adaptations are detailed below.
2.3.5.1. Axial hold down of the assemblies via the bottom nozzle Axial hold down of assemblies without control cluster is accomplished by means of a pad mounted at the centre of the top pl ate which bears on the adaptor plate of the top nozzle.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 7 of 39
Given the presence of the control cluster and its restraint system at the centre of the top plate, a 12-foot assembly with control cluster is restrained via the bottom nozzle (see drawing 229 K 0745 in Appendix 1.4-1 of the FCC3 report). This involves pressing the legs of the bottom nozzle of the assembly against a new bottom plate by means of eight retaining claws. In or der 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 plat e 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 nozzl e against the top plate is provided by screw connections comprising an M8 clamping bolt and a captive nut on the bottom plate.
2.3.5.2. Axial hold down of the control clusters The control clusters are transported with t heir rods inserted into the fuel assembly guide tubes.
To maintain the control cluster in place and prevent its movement relative to the fuel assembly, it is pressed against the top noz zle of the assembly by a support system
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 8 of 39
positioned at the centre of the top plate. This system consists of a screw connection and a bearing pad on the hub of the control cluster (see drawing 229 K 0715 in Appendix 1.4-1 of the FCC3 report).
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 FCC3 packagi ng (see drawings 229 K 700 and following drawings in Appendix 1.4-1 of the FCC3 r eport) produces a cylindrical protrusion with a height of mm.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 9 of 39
The shock absorber covers not only this pr otrusion but also the ends of the bolts when the control cluster is clamped so t hat no element projects beyond it. The absence of any protrusion facilitates the fitting of the lid which bears the shock absorbers and avoids the risk of any dam age to them. It contains a minimum thickness of mm of balsa wood.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 10 of 39
2.3.5.3. Fuel assembly wedging system The wedging system comprises a base plat e 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 M10 screws. The height of the wedging spacer is mm.
The wedging system may or may not be removed during transport of the fuel assembly without control cluster in the ca se of a packaging equipped with top plates with protrusion for transporting the control cluster.
The adaptations made to the top plate to include the wedging system only affect version 1 FCC3 packagings dedicated to the transportation of fuel assemblies with control cluster.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 11 of 39
2.3.5.4. FCC3 packagings transporting control clusters To enable top plates to be fitted for the transport of control clusters with the assemblies without adversely affecting operations, the 2 shell bottoms are extended to maintain a gap of about mm on each side of the internal equipment with the shell absorbers. This extension is such t hat the flanges are in the same plane as the legs. The overall length of the packaging is unchanged. Thus the shell of the FCC3 packaging allowing the transportation of a ssemblies with control cluster (drawing series 229 K 0700) has a length of mm greater than the other series.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 12 of 39
2.3.6. Content restraint system Radial restraint of the packaging 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), pad positions are defined in relation to grid positions of the transported assemblies.
Axial hold down of the contents can be accomplished in 3 different ways:
Assemblies transported without control cl uster (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 asse mblies are thus pressed against the bottom plate.
Assemblies transported without control clus ter (option 2, drawing series 229 K 0700):
Axial hold down can be provided via the bottom nozzle of the assembly by 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 to 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 0700):
Axial hold down of the assemblies is provi ded in the manner described in the previous section. Axial hold down of the control cluster is provided by pressing the control 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 control cluster.
An additional wedging system for the fuel assembly is set up between the top plate and the upper nozzle of the assembly. This w edging system comprises a base plate at each corner of which are welded four cylinders beve lled so as to fit into the square cross-section of the cavity. The plate is fixed to the top plate by M10 screws.
Outline drawings of the hold down systems are given in paragraph 2.3.5.
2.3.7. Support leg locking nut restraining system A locknut/welded nut system, on a threaded rod, is used to adjust the tr avel of the support leg, needed to adjust the verticality of the internal fitting.
Support leg
Locking nut Welded nut
Threaded rod
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 13 of 39
The packaging model also presents a variant on the support leg adjustment system, which involves the presence of a longer thr eaded rod, drilled through for the insertion of a dowel pin, forming a mechanical stop.
Threaded rod
Dowel pin position
Locking nut
- 3. Specification of weights
In order to ensure compliance wi th regulatory requirements as demonstrated in this report, the maximum weight of the loaded packaging must be less than 4,385 kg.
For guidance, the maximum empty weight is kg.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 14 of 39
- 4. Allowable packaging defects
4.1. Dents on the enclosure
Le ngth of defect: L Width: l =
Smal lest dime nsio n of d efect
Fr on tview Shape defect =
de pt h: p Si deview
Local deformations on the container shell are acceptable, provided that:
The affected surface area is less than 200 cm 2 per dent:
L cm2; l200
and the ratio of width to depth of the dent exceeds 2: l 2; p
and no cracking is detectable visually in the affected area.
4.2. Deformations of reinforcements and gripping zones
Shape defect: d
Width: l =
smal lest dime nsio n of defect
Thickness: e
Deformations of angle bars, fork pockets, lift ing boxes and other reinforcements are acceptable provided that:
the ratio of the smallest deformed dimension (width) to the shape defect is greater than 2:
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 15 of 39
l ; 2 d
and the ratio of the shape defect to the thickness of the affected part is less than 2 :
d ; 2 e
and if 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 cm 2 per dent;
and the depth of the defect is less than 8 mm;
and the defect is not through-wall, i.e. if the ratio of the dent width to depth is greater than 2.
4.4. Justification of acceptability of these defects
Compliance with the criteria specified above en sures the absence of changes in the behaviour of the FCC3 package in routine, normal and acci dent 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 limi ted 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 stress state nor the resi stance 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 behav iour of the packaging in drop conditions.
Allowable defects in shock absor bers: 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 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 t he components referred to in §§ 4.1 to 4.3 are consistent with safety requirements.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 16 of 39
- 5. Definition of functional systems and protection systems of the packaging
5.1. Closure 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 fr ame 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 cont rol clusters, the top plates each incorporate an additional shock absorber each comprising a me tal box containing a block of balsa wood.
5.3. Handling and tie-down elements
Handling can be performed in normal safety c onditions using standard lifting gear, using a suitable lifting beam or slings fitted with shac kles or hooks. Two 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 closed or not at their ends, comprise a folded plate with a hole in it for a shackle or a hook;
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. Containment system
In the design of FCC3 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, door s and end plates, the assembly as a whole forming two neutron cavities. Regulatory dr op 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 per forms the following functions:
limitation of neutron interaction between f uel assemblies or rod boxes and between packages,
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 do ors 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);
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 17 of 39
The upper and lower half-shells ensuring the protection of the internal system during normal and accidental transport conditions (NCT and AC T). 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 UO 2 pellets and/or a mix of UO 2 and material acting as neutron poison;
The cladding tubes: ensuring fissile mate rial confinement in accident conditions;
During transportation of fuel assemblies:
the structure of the assembly (grids, nozzl es). This structure defines and limits the volume occupied by the fiss ile 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 with the longitudinal and axial wedging system ensures that the volume occupied by the rods is limited.
The minimal characteristics of the fissile materi al components 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 co nditions 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 t he temperatures prevailing under ac cident conditions of transport.
- 6. Material specifications
The numerical values given in Table 1.4-1 ar e 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 grade of steel us ed in the manufacturing of Components Important for Safety, a verification is undertaken for the abs ence of brittle fractures at -40°C. In addition, toughness 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 th is material. No further guarantee is needed for this structure.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 18 of 39
For fasteners of quality grade, the material grade is chosen from those proposed in standard
, reference <1>.
In addition, the procurement requirements for bol ts will include a guaranteed toughness value at
-40 °C by means of specific product tests, in accordance with, reference <2>.
The main materials used for construction of th e packaging components are listed in Table 1.4-1.
Unless otherwise stated, the properties are give n 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 materi als are specified in Table 1.4-4.
- 7. Analysis of components important for safety
The Components Important for Safety (CIS) for the FCC3 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 thr ee 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 asse mbly 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 over all constriction of the cavity whic h 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 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 me chanical tests. The containment system formed by the rod cladding and the welded plugs remains intact and continues to provide the containment function. Likewise, despite the impacts of the va rious drops, the internal equipment continues to provide protection for the assemblies as all t he 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.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 19 of 39
It will be noted that the axial hold down of the assembly is sized 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 and minimum mechanical characteristic s (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 criter ia are as follows:
This mode of treatment applies to the following components:
For components subjected to bending loads, t he acceptance criteria are as follows:
This mode of treatment applies to the following components:
8.2. grade steel screws
The surface treatment on grade screws (connecting half-shells screws and cradle fixing screws on the frame) is a coating according to the norm Erreur ! Source du renvoi introuvable., 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
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 20 of 39
(see Chapter 2.5 of this Report). The criticalit y safety studies take into account a hydrogen content of % and a boron content of % associated with a density of.
The number of atoms is calculat ed by the following formula: N (H) d%XNA MH
Where: d density of resin;
%X hydrogen or boron content of resin;
N Avogadro's A number;
M molar mass of hydrogen or boron H
Given that the Avogadro's number and the molar ma ss of hydrogen or boron are fixed in this formula, the acceptance crit eria 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 measur e 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 plat eau 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 cr iterion, as shown schematically below:
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.
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 21 of 39
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 penetration testing - no notable faults: no no table indication as per Table I1.A2.2 of CODAP - 2005 - Section I Appendix I1.A2; Inspection by white dye penetrant: Dye penet rant 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>
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 22 of 39
List of figures
Figure Title Number of pages
1.4-1 FCC3 packaging - General view with container closed 1
1.4-2 FCC3 packaging - Arrangement of assemblies 1
1.4-3 FCC3 packaging - General view with container open and frame in vertical position 1
1.4-4 FCC3 Packaging - View of configurations with/without rod control clusters 1
1.4-5 Illustration of the FCC3 packaging 1
TOTAL 5
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 23 of 39
List of tables
Table Title Number of pages
1.4-1 Characteristics of the FCC3 packaging materials 2
1.4-2 General analysis of functions important for safety 3
1.4-3 Analysis of components important for safety during regulatory tests 3
1.4-4 Component conformity table 9
1.4-5 List of welds important for the safety of the packaging 11
TOTAL 27
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 24 of 39
List of Appendices
Appendix Title Number of pages
1.4-1 Appendix 1.4-1 DOS-19-021165-009 "Drawings of the FCC3 packaging (version 1)" 2
1.4-2 Appendix 1.4-2 DOS-13-00081779-042 "Drawings of the FCC3 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-13-00081779-044 "Photographs of the FCC3 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
Non-proprietary version
Formulaire : PM04-4-MO-6E rev. 03 Unrestricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 30 of 39
Table 1.4-1 CHARACTERISTICS OF THE FCC3 PACKAGING MATERIALS
Non-proprietary version
Formulaire : PM04-4-MO-6E rev. 03 Restricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 38 of 39
Table 1.4-5 List of welds important to the safety of the packaging Table 1.4-5 List of welds important to the safety of the packaging
Non-proprietary version Formulaire : PM04-4-MO-6E rev. 03 Restricted Orano Orano NPS Identification : DOS-19-021165-005-NPV Vers. 1.0 Page 39 of 39
Table 1.4-5 List of welds important to the safety of the packaging
Non-proprietary version