ML22277A796

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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
Shared Package
ML22277A716 List: ... further results
References
CAC A33010, EPID L-2022-DOT-0008
Download: ML22277A796 (8)
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Text

IDENTIFICATION REVISION I

FFDC05098-EN 1

1 3.0 I Framatome framatome I

PUBLIC I Fuel 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 CATEGORY STR - Study Report STATUS This document is electronically approved. Records regarding the signatures are stored in the fsanpexp EDRMS object Id. : 09012167813d51d4 Documentum docbase. Any attempt to modify this file may subject employees to civil and criminal penalties.

Released date (Western EU time) : 2022/06/03 08:50:10 Role Date (YYYY/MM/DD)

Writer Reviewer Approver RELEASE DAT A:

CHANGE CONTROL RECORDS:

This document, when revised, must be reviewed or approved by following regions:

France:

Y USA:

N Germany:

N Classification Export AL: 0E001 ECCN: N Les marchandises portant la dttsignalion *AL in~ al N~ sont soumlses ti la ffiglementatlon e-uro~enne ou allemande en maliere de contr61e des exp0rtalions au sein ou hors de l'UE. Les marchandises p0rtant 1a designation "ECCN inBgal N" soot soumises a la reQlementation ameficaine. Les marchandises portant 1es designations *AL:W ou ~ECCN:N~ peuvent, selon la destination ou !'utilisation finales du produit. egalement etre soumises a autorisation.

Export classification AL: 0E001 ECCN: N Goods labeled with "AL not equal to N* are subject to European or German export authorlzat1on when being ex.ported within or out of the EU. Goods labeled With ~ECCN not eQual lo N* are subject to US reexPort authorization. Even without a label, or with label "A L: N" or "ECCN: W, authorization may be req uired due lo the final whereabouts and purpose for which the goods are to be used.

Exportkennzeichnunq Al : 0E001 ECCN: N Die, mii *AL ungleich W gekennzeichneten GOte< unierliegen bei der Ausf'Uhr aus der EU bzw.

innergemeinschaftlichen Verbringung der europaischen bzw. deutschen Ausfuhrgenehmigungspflicht. Die mil

  • EcCN unglelch W gekennzelchneten GUier unterliegen der US-Reexportgenehmlgungspflicht. Auch ohne Kennzeichen, bzw. bei Kennzeichen "AL: N" oder *1ECCN; N", kann stch eine Genehmigungspfficht, unter anderem durch den Endverbleib und Verwendun szweck de r Gut.er er eben.

CW01 Re-... 5.4 - 05110121

I No FFDC05098-EN Rev. 3.0 STR - Study Report NON-PROPRIETARY I Page 2/8 VERSION REVISION A

B 3.0 REVISIONS DATE NOTES 01/15/2009 New document French version: Incorporation of IRSN comments 04/20/2009 English version:

06/23/2009 French version:

02/09/2021 Replacement of AREVA NP by Framatome English version: Change from brand name MS to MSFramatome See first page BRAND NAMES framatome AFA 3G, M5, M5Framatome, Q12, MONOBLOC, TRAPPER, AGORA, HTP, HMP and FUELGUARD are trademarks or registered trademarks of Framatome or its subsidiaries, in the USA or in other countries.

Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

No FFDC05098-EN Rev. 3.0 STR - Study Report framatome NON-PROPRIETARY VERSION Page 3/8 CONTENTS

1.

IMPACT STRENGTH OF FRAMATOME ZR ALLOYS..................................................................... 4 1.1.

IMPACT STRENGTH IN RELATION TO TEMPERATURE.................................................................... 4 1.2.

IMPACTSTRENGTH OF FRAMATOME ZR ALLOY CLADDING TUBES.............................................. 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/cm2 of Zircaloy-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 Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

No FFDC05098-EN Rev. 3.0 STR - Study Report framatome NON-PROPRIETARY Page 4/8 VERSION

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 specimens 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 ductile type rupture facies. These results also show that, with the same recrystallized metallurgical state, the M5Framatome alloy has the greater resistance in terms of impact strength.

Table 1: Impact strength between -40 and +40°C in J/cm2 of Zircaloy-4 and M5Framatome-Temperature, °C M5Framatome, J/cm2,-----------,

Zircaloy-4, J/cm2 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 rupture is of ductile type. These results also show that the range of Zr alloys proposed by Framatome is bounded at one end by stress-relieved Zircaloy-4 representing the lower bound case-and on the other by M5Framatome representing the upper bound case -

Table 2: Impact strength at ambient temperature, in J/cm2, of Framatome Zr alloys Alloys Impact strength, J/cm2 Average, J/cm2 Stress-relieved M5Framatome Zircaloy-4 Zr1.0Nb PCA-2b DX-HPA4 The comparison of the two sets of measurements taken for M5Framatome (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 discrepancy 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/cm2 on average on tube compared with.J/cm2 for the standardized test. Consequently, based on Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

No I

FFDC05098-EN Rev. 3.0 NON-PROPRIETARY I STR - Study Report framatome VERSION Page 5/8 this observation, the temperature dependency at temperatures 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 reasonably 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 mechanical! 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 highest ductility -- and the highest impact strength --and the lowest yield stress clearly represents the upper bound.

Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

No FFDC05098-EN Rev. 3.0 STR - Study Report framatome NON-PROPRIETARY Page 6/8 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-- M5Frama1ome in terms of tensile properties 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 manufacturing 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 tensile 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."

Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

No FFDC05098-EN Rev. 3.0 STR - Study Report framatome I

I NON-PROPRIETARY Page 7/8 VERSION PROPRIETARY DRAWING Figure 1: Total elongation in relation to yield strength at ambient temperature Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

No FFDC05098-EN Rev. 3.0 NON-PROPRIETARY I STR - Study Report framatome VERSION Page 8/8 PROPRIETARY INFORMATION Framatome - Fuel This document is sub*ect to the restrictions set forth on the first or title a e

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