ML22277A796

E61285 Enclosure 4, 002c1 Appendix 1.3-3, Document No. FFDC05098-EN, Revision 3.0, Impact Strength of Zr Alloys Proposal for the Specification of the Cladding Materials in the Shipment Approval (Public)

ML22277A796
Person / Time
Site:	07103097
Issue date:	06/03/2022
From:	Boyle R, Shaw D TN Americas LLC
To:	Division of Fuel Management
Garcia-Santos N
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References
CAC A33010, EPID L-2022-DOT-0008
Download: ML22277A796 (8)

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IDENTIFICATION REVISION I FFDC05098-EN 1 1 3.0 I Framatome framat o me Fuel I PUBLIC I

TOTAL NUMBER OF PAGES : 8

Impact strength of Zr alloys Proposal for the specification of the cladding materials in the shipment approval I NON-PROPRIETARY VERSION I

ADDITIONAL INFORMATION:

PROJECT DISTRIBUTION TO PURPOSE OF DISTRIBUTION

HANDLING PUBLIC

CATEGOR Y STR - St udy Rep ort

STATUS

This d ocument is electron ically approved. Records regardi ng the signatures are stored in the fsanpexp EDRMS object Id. : 090121678 13d51d4 Documentum docbase. Any att empt t o modify th is file may su bj ect employees to civi l a nd criminal penalties. Re leased date (Western EU t ime) : 2022/06/03 0 8:50: 10 Role Date (YYYY/MM/DD)

Writer Reviewer A pprover

RELEASE DAT A: C lassification Les marchandises portant Export AL: 0 E001 ECCN : N la dttsignalion *AL in~ al N~ sont soumlses ti la ffig lementatlon e-uro~en ne ou

allemande en maliere de contr61e des exp0rtalions au sein ou hors de l'UE. Les marchandises p0rtant 1a designat io n "ECCN in Bgal N" soot soumises a la reQlementation am efica ine. Les march andises portant 1es d es ignatio ns *AL:W ou ~ECCN:N~ peuven t, selo n la destination ou !'utilisatio n fina les du p ro du it. egalemen t etre soum ises a autorisation.

Export class ificati on AL: 0E00 1 ECCN : N Goods labeled with "AL not equa l to N* a re su bject to E uropean or German export author lzat1on when being e x.ported within o r ou t o f t he EU. Goods labeled With ~ECCN not eQual lo N* are subject to US reexPort a uthori za tio n. Even w ithout a label, o r with label "A L: N" o r "ECCN : W, autho rization may b e req uired d ue l o the final whereabouts and pu rpose for which the goods are to be used.

France: Y Exportkennzeichnunq Al : 0E001 ECCN: N CHANGE CONTROL RECORDS: Die, m ii *AL ung le ich W ge kennzeichne te n GOte< u nier liegen bei d er Ausf'Uhr aus der EU bzw.

T his document, when revise d, must be USA: N innerge me inschaftliche n Verbringu ng der eu ropaischen bzw. deut schen Ausfuhrgeneh m ig ungspflicht. Die m il reviewed or approv e d by following re gions : Germany : N

• EcCN Kennzeichen, ungle lch bzw. W gekennze lchnete n GUier bei Kennzeichen "A L: N" oder unterliegen der *1ECCN; N", ka n n US-Reexport ge ne hmlg ungspstch e ine Genehmig ungspfficht, un ter fl icht. Auch an derem ohne

d urch den Endverble ib u nd Verwend un szweck de r G ut.er e r eben.

CW01 Re-... 5.4 - 05110121 No FFDC05098-EN Rev. 3.0 NON-PROPRIETARY I Page 2/8 STR - Study Report framatome I VERSION REVISIONS

REVISION DATE NOTES

A 01/15/2009 New document

B French version: Incorporation of IRSN comments 04/ 20/2009 English version:

06/23/2009 3.0 French version:

02/09/2021 Replacement of AREVA NP by Framatome English version: Change from brand name MS to See first page MSFramatome

BRAND NAMES

AFA 3G, M5, M5Framatome, Q12, MONOBLOC, TRAPPER, AGORA, HTP, HMP and FUELGUARD are trad e marks or registered trademarks of Framatome or its subs idiaries, in the USA or in other countries.

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CONTENTS

1. IMPACT STRENGTH OF FRAMATOME ZR ALLOYS..................................................................... 4 1.1. IMPACT STRENGTH IN RELATION TO TEMPERATURE.................................................................... 4 1.2. IMPACTS TRENGT H OF FRAMATOME ZR ALLOY CLADDING T UBES.............................................. 4

2. LINK BETWEEN IMPACT STRENGTH AND TENSILE MECHANICAL PROPERTIES.................. 5

3. PROPOSAL FOR SPECIFICATION OF CLADDING MATERIALS IN THE SHIPMENT APPROVAL........................................................................................ *-************************************-********6

LIST OF TABLES

Table 1: lmpactstrength between -40 and +40 °C in J/cm 2 of Zirca loy-4 and M5Framatome -

............................................................................ 4 Table 2: Impact strength at ambient temperature, in J/cm2, of Framatome Zr alloys.............................. 4 Table 3: Mechanical characteristics under tension at ambient temperature for Framatome Zr alloys..... 5

LIST OF FIGURES

Figure 1: Total elongation in relation to yield strength at ambient temperature....................................... 7 Figure 2 : Impact strength testing specimen with Plexiglas mandrel........................................................ 8

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1. IMPACT STRENGTH OF FRAMATOME Zr ALLOYS

1.1. IMPACT STRENGTH IN RELATION TO TEMPERATURE The impact of temperature on impact stren th of Zr allo s was carried out on standardized spec imens taken from Zircaloy-4 and M5Framatome bars The tests were carried out under Quality Assurance (QA) conditions in an approved laboratory (MECASEM) at a temperature range o - o + e resu s o ese tests,

already provided in the safety analysis report (Appendix 1.4-4 ), are presented in Table 1. Throughout the temperature range studied both alloys show a duct i le type rupture facies. These results also show that, with the same recrys t allized metallurgical state, the M5Framatome alloy has the greater resist ance in terms of impact strength.

Table 1: Impact strength between -40 and +40°C in J/cm 2 of Zircaloy-4 and M5Framatome-

Temperature, °C

M5Fra matome, J/cm 2,-----------,

Zircaloy-4, J/cm 2 L __________ _J

1.2. IMPACT STRENGTH OF FRAMATOME Zr ALLOY CLADDING TUBES In order to evaluate the impact strength of the cladding tubes made of different Zr alloys proposed by Framatome (Table 2), we performed this comparison at ambient temperature using a method developed by the CEA and Framatome, provided in Appendix 1. This series of impact tests was carried out on cladding tubes provided from standard production and compliant with specified criteria. The results are given in Table 2. For all alloys studied, the ruptu r e is of ductile type. These results also show that the range of Zr alloys proposed by Framatome is bounded at one end by stress-re lieved Zircaloy-4 representing the lower bound case-and on the other by M5Framatome rep resenting the upper bound case -

Table 2: Impact strength at ambient temperature, in J/cm 2, of Framatome Zr alloys

Stress-Alloys relieved M5Framatome Zr1.0Nb PCA-2b DX-HPA4 Zircaloy-4

Impact strength, J/cm 2

Average, J /cm 2

The comparison of the two sets of measurements taken for M5Fra matome (Table 1 and Table 2) shows that the impact strength values obtained at ambient temperature on cladding tubes are higher than those from the standardized test on a solid sample, a disc repancy that may be attributed to the test method used. A similar discrepancy is also observed for Zircaloy-4, i.e. an impact strength of

• J/cm 2 on average on tube compared with.J /cm 2 for the standardized test. Consequently, based on

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this observation, the temperature dependency at t emperatures between -40 and +40°C determined on standardized specimens in § 1. 1 can reasonably be applied to the cladding tubes and to all of the Framatome alloys. In addition, based on our previous experience with transport, it may reasona bly be considered that an alloy with impact strength greater than *J/cm 2 has a sufficient resistance to be transported without damage.

2. LINK BETWEEN IMPACT STRENGTH AND TENSILE MECHANICAL PROPERTIES Impact strength is not a value specified in the technical documentation for Framatome cladding tubes and is therefore not measured systematically on manufacturing batches. If this property were to be retained in shipment approvals, it would therefore be impossible to ensure verification of compliance of all batches of the tubes.

But, as shown by the earlier results, impact strength is a mechanical property linked directly to tensile mechanical properties of the tubes, in particular with yield strength and total elongation at ambient temperature. The more ductile the material, the greater its impact strength, in fact, and vice versa, the higher the yield strength, the lower the impact strength.

We therefore propose that the transport approvals include the mechanica l! characteristics under tension as measured during manufacture.

The Framatome material specification does provide for verification of chemical composition, dimensional characteristics, corrosion resistance, microstructure and mechanical characteristics including tensile properties at ambient temperature, for all batches of cladding tubes.

We therefore propose to include definition in the shipment approvals of the Zr alloys by means of all or part of the following values under tension in ambient conditions, considered highly relevant with regard to manufacturing and design aspects: yield strength (YSo.2), ultimate tensile strength (UTS) and total elongation (At).

Table 3 provides the minimum values specified for YSo.2, UTS and At during ambient temperature tensile testing for Zr alloys proposed by Framatome.

Table 3: Mechanical characteristics under tension at ambient temperature for Framatome Zr alloys

Alloys MSFramatome Zr1Nb PCA-2b DX IHPA4 Stress-relieved Zircaloy-4

The analysis of the tensile data in Table 3 shows that stress-relieved Zircaloy-4 and M5Framatome are at either end of the range of alloys proposed by Framatome (Table 2) in terms of mechanical strength at ambient temperatures, as they are for impact strength :

• Low-tin stress-relieved Zircaloy-4, with the highest yield stress and in particular the lowest ductility -- combined with the lowest impact strength --is definitely the lower bound.

• MSF,amatome, with the h ighest ductility -- and the highest impact strength --and the lowest yield stress clearly represents the upper bound.

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VERSION

The other Framatome Zr alloys are all between these two bounds :

• Zr1 Nb

This analysis shows therefore that the Zr alloy~matome are part of a range bounded at each end by the stress-relieved Zircaloy-4 and-- M5 Frama1ome in terms of tensile propert ies and in terms of impact strength and can be classified in the same order for both of these properties.

Given that:

• on one hand, the Zr alloys proposed by Framatome are produced from raw materials and through transformation processes using the same tools for all of the alloys, among others in terms of pilgering, heat treatment and surface preparation.

• on the other, the generic qualification of the cladding tubes, which could be applied to any Zr alloy, is used to set the operations of ingot-making and manufactu r ing procedures with an effect on the quality and the reproducibility of the basic properties of the cladding tubes (chemical composition, corrosion, mechanical strength, texture, creep, impact strength, etc.).

3. PROPOSAL FOR SPECIFICATION OF CLADDING MATERIALS IN THE SHIPMENT APPROVAL We therefore propose to define the Zr alloys proposed by Framatome in the shipment approval as follows:

"the term "Zr alloys" is understood to mean any alloy containing at least 95% of Zr, qualified and approved for use in a water-cooled reactor and whose ambient temperature tensi le properties, determined as per a standard test, yield strength YSo.2 and total elongation At, are located within the generic acceptance range shown on Figure 1, which plots At versus YSo.2. "

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PROPRIETARY DRAWING

Figure 1: Total elongation in rel ation to yield strength at ambient temperature

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PROPRIETARY INFORMATION

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