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FSUE SRI SIA « LUCH »

Structure-phase investigation and mechanical properties of Zr-1%Nb alloy claddings after LOCA tests on PARAMETR facility under 1400 °C. FSUE SRI SIA « LUCH ». Gukov M.Yu., Deniskin V.P., Ignatjev D.N., Konstantinov V.S., Nalivaev V.I., Fedik I.I. FSUE “SRI SIA LUCH”

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FSUE SRI SIA « LUCH »

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  1. Structure-phase investigation and mechanical properties of Zr-1%Nb alloy claddings after LOCA tests on PARAMETR facility under 1400 °C FSUE SRI SIA «LUCH» Gukov M.Yu., Deniskin V.P., Ignatjev D.N., Konstantinov V.S., Nalivaev V.I., Fedik I.I. FSUE “SRI SIA LUCH” Nechaeva O.A., Novikov V.V., Salatov A.V., Fedotov P.V. FSUE VNIINM Semishkin V.P. FSUE EDB “Gidropress”

  2. Content 1. Experimental Facility: Design and basis Technical Parameters 2. Experimetal Results of Tests under the Quench Conditions at different Temperatures: - 1-st Test (FA1) – 900 °C - 2-nd Test (FA2) – 1200 °C - 3-d Test (FA3) – 1400 °C 3. Material researches CONCLUSIONS

  3. Test InstrumentationTest Bundle Specification Heated rod Unheated rod Test Bundle

  4. Experimental Facility Functional Diagram

  5. Basis parametersof tests Quench temperature, °C

  6. Appearance of claddings after tests of FA1and FA2 Fuel Assembly #1 Fuel Assembly #2

  7. 1 2 Appearance of FA3 after tests 4 3 Tcladdings=1200 °С Tcladdings=1000 °С 2 3 4 1 Input of steam Вход пара Embayment from below Залив снизу Tcladdings >2000°С Tcladdings=1400 °С

  8. Appearance of external surface of FA1 and FA2 deformed claddings State of an external surface of strained claddings (FA1, FA2) Profile of oxide film rupture in a zone of maximal deformation of claddings (FA1) Multilayer oxide film on external cladding surface(FA2)

  9. Maximum valuations of structural parameters of claddings FA1-3

  10. Change of  - Zr (O) layer thickness depending on ECR value(FA1–3)

  11. Change of structural-phase parameters and  – Zr failure type depending on ECR value (FA 1 – 3)

  12. Change of ECR on azimuth of claddings depressurization zone

  13. Character of ZrO2 and α-Zr(O)layers failure ZrO2 (x1600) α-Zr(O) (x3000)

  14. Change of  – Zr layer failure character undermechanical tests of samples Ductile Quasi-brittle Brittle FA1 (x2000) FA2 (x2000) FA3 (x2000)

  15. Strength properties of claddings in a transverse direction depending on ECR value(FA 1 – 3)

  16. Microhardness level at which spreading of the crack, arisen in brittle α-Zr (O) layer, was complicated due to enough high fracture toughness of α '-Zr layer

  17. “Constructive strength” of unstrained and depressurized claddings of FA1 and FA2 under tension

  18. Change of microhardness on azimuth of claddings rupture zone (FA1, FA2)

  19. CONCLUSIONS • It was experimentally shown, that quenching of bundles at temperatures 900 C (FA1) and 1200 C (FA2) did not result in the claddings fragmentation, and the residual resource of mechanical properties was sufficient for its subsequent dismantling and transportation. • The increase of bundle temperature up to 1400°С (FA3) before quenching resulted in the claddings fragmentation. • The faultiest zone ofthe claddings of FA1 and FA2 was the rupture zone due to the thinning of the cladding under the peripheral deformation and its double-side oxidation.

  20. Non-monotonic character of changing strength characteristics of the claddings was established depending on their oxidation level. Increase in a yield stress in a transverse direction decrease in plasticity to a zero value was observed up to ECR value of ~ 8 - 9 %. The further oxidation of the claddings resulted in reducing strength. • Based on electron-microscopic researches change of –Zr layer failure character was established depending on its structural – phase state determined by ECR value:

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