Proposal for a Coordinated Research Project: Prediction of Axial and Radial Creep in Pressure Tubes

Transcription

1 Proposal for a Coordinated Research Project: Prediction of Axial and Radial Creep in Pressure Tubes Patricia B.Bozzano - ARGENTINA Vienna, july 2013

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4 Embalse Nuclear Power Plant POTENCIA TÉRMICA: MWt POTENCIA ELÉCTRICA BRUTA/NETA: 648 Mwe MODERADOR Y REFRIGERANTE: Agua pesada (D2O) COMBUSTIBLE: Uranio natural GENERADOR DE VAPOR: Cuatro verticales, tubos en "U" Incolloy 800TURBINAUna etapa de alta presión, tres etapas de baja presión. Velocidad:1.500 rpm GENERADOR ELÉCTRICO: Cuatro polos. Tensión: 22 KV, 50 Hz

5 Laboratory for Testing Materials PT - TASKS ISO 9001 Certification Rolled Joint Strength-Fracture Toughness: Fracture Lab. Responsible: F. Iorio. K IH DHC velocity: Hydrogen Damage and Fracture Labs. Responsible: G. Domizzi. Hydride orientation: Hydrogen Damage and Metallographic Labs. Responsible: G. Domizzi. Alpha grains and Beta phase thickness: Metallography and Electron Microscopy Lab. Responsible: P. Bozzano. Texture Dislocation density: X-Ray Diffraction Lab. Responsible: N. Mingolo.

6 Rolled Joint Strength-Fracture Toughness FRACTURE AND FATIGUE LAB 12 Profesionals - 6 Technicians Facilities: Thermo-mechanical lab. Mechanical testing labs. Metallographic lab.

7 FRACTURE AND FATIGUE LAB. BACKGROUND 1.-Round Robin Test on Fracture Toughness of PT. (1993, AECL CRNL) Participant Labs.(9) 2.- CANDU Pressure Tubes Surveillance program (CNE). 3.-Fracture Assessment of NDT Indications During GS Repositioning in CNE

8 FRACTURE AND FATIGUE LAB. 1.-Round Robin Test on Fracture Toughness of PT. (1993, AECL CRNL)) Participants Labs.(9) (Canada)- AECL-CRNL; AECL-WRNE; HYDRO QUEBEC; ONTARIO HYDRO. (Japan)- HITACHI; PNC; KOBE STEEL. (UK)- AEA-TECH. (Argentina) CNEA MATERIALS: (3).- Zr-2.5%Nb (CW); Zr-2.5%Nb (HT); Zry-2

9 FRACTURE AND FATIGUE LAB. Robin Test on Fracture Toughness of PT. STANDARD: Standard Test Method for Fracture Toughness of CANDU PT Material: Zr-2.5%Nb HT

10 FRACTURE AND FATIGUE LAB. Robin Test on Fracture Toughness of PT. Material: Zr-2.5%Nb CW

11 FRACTURE AND FATIGUE LAB. Robin Test on Fracture Toughness of PT. Material: Zry-2

12 FRACTURE AND FATIGUE LAB. POST IRRADIATION STUDIES ON CNE PT at CNEA HOT CELLS HWR Surveillance program, set 2 testing HWR Surveillance program, IAEA Reference material testing. HWR Control rod failure analysis. CANDU Pressure Tubes Surveillance program

13 FRACTURE AND FATIGUE LAB. 2. CANDU Pressure Tubes Surveillance program TASKS: Measurement of diameter and thickness. Tensile properties. Fracture Toughness.

14 Hot cells used during the study

15 Pressure tube sections

16 Specimens extraction program Position 12 hs Position 3 hs Position 6 hs Position 9 hs

17 Section of tube after specimens extraction

18 dj/da (MPa) FRACTURE AND FATIGUE LAB. Fracture toughness results A14 L12 other reactors T=250 0 C Fluence ( n/m 2 x )

19 FRACTURE AND FATIGUE LAB Fracture Assessment of NDT Indications During GS Repositioning in CNE During periodic outages of CNE, Fuel Channel Inspections are performed for GS spacers repositioning and PT/CT gap measurements. Assessment of reportable indications of flaws detected by NDT was carried out from the beginning of such works in 1991.

20 KIH DHC velocity Hydrogen Damage Labs Facilites: Gaseous Charge (Sievert) Chatodic charge Tensile strength, weight dead machines (Two) Acoustic Emission device

21 IAEA COORDINATED RESEARCH PROGRAMME ON INTERCOMPARISON OF TECHNIQUES FOR PRESSURE TUBE INSPECTION AND DIAGNOSTICS CRP: I Determination of hydrogen in zirconium alloy components and Blister characterization by in-situ NDE techniques Participating labs. Canada, Korea, China. Romania, Argentina Participation of Argentina: hydrogen charge of Hydrogen Charge Background: 90 samples for hydrogen determination: IGF, HVEMS, DSC, Resistivity, DTA 17 samples for non destructive techniques 6 blisters in CANDU pressure tube sections for NDT evaluation

22 Measured concentration (ppmw) Hydrogen concentration: results of IAEA INTERCOMPARISON Arg1-2nd (IGF) Arg2-2nd (IGF) Korea (IGF) India (IGF) Canada (HVEMS) India (HVEMS) gaseous charge concentration (ppmw)

23 KIH DHC velocity DHC Background CCT samples fatigue pre-cracked used in CANDU Pressure Tubes Surveillance program IAEA COORDINATED RESEARCH PROJECT Determination crack growth speed during DHC of Zirconium alloys of CNEA - IAEA Research Agreement Nº 10698/R0. (DCPD) Effect of heat treatment on Vp (AE)

24 IAEA COORDINATED RESEARCH PROJECT Vp measured by DCPD (CORROSION LAB)

25 Efect of heat treatment on Vp Vp [m/s] ºC 430 ºC 500 ºC /T(K) Vp measured by AE

26 Nc, Cumulative Count Rate Correlation between Vp and cumulative counts: nondestructive tool for DHC velocity estimation during the test 8 x Velocity [m/s] x 10-8

27 Hydride distribution, Alpha grains and Beta phase thickness Hydrogen Damage, Metallograhy and Electron Microscopy Labs Optical Microscopy Scanning Electron Microscopy (SEM) Transmission Electron Microscopy (TEM)

28 FEI Quanta 200 (HV, LV, ESEM) SyS software for image analisys

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30 Philips CM200 with EDS

31 Background Microstructural characterization of 285 offcuts of pressure tubes of CNE Morpholgy, size and distribution of phases α and β Hydride distribution, size and morphology Vickers microhardness with 100 grs. Average 235 Hv 100 Morpholgy, size and distribution of carbide precipitates. CANDU P Tubes Surveillance program Hydride distribution of A-14 and L-12 PT of CNE.

32 Texture Dislocation density X-Rays Diffraction Lab Facilities: Philips X-PERT crystallographic texture, Residual stresses and diffraction profiles analysis Philips PW 310 difractometer.

33 X-Ray Diffraction Laboratory: Background Crystallographic texture determination in Zralloys pressure tube materials: Measurements of direct pole figures (PF) from x-ray diffraction in different directions of tube: radial (DR), transverse (DT), axial (DA). Evaluation of F d texture factor (Kearns factor) calculated from experimental basal (0002) pole figures for the three principal directions of the tube:

34 Pole figures (0002) obtained with Cu-K radiation for differents sections of Zr-2.5%Nb tube DT//DN (a) DR//DN (b) DA//DN (c) (a) transverse section, FWHM=0.444 o (b) radial section, FWHM=0.373 o (c) axial section, FWHM=0.399 o. FWHM: full width at half maximum

35 X-ray diffraction line profile analysis from patterns diffraction data and Rietveld refinement for peak profile: Analysis of peak broadening (FWHM) caused by the crystalline sizes and microstrain X-ray diffraction pattern for the Zr-2.5% Nb tube pressure from transverse section (DN//DT). FWHM: full width at half maximum Evaluation of dislocation densities in plastically deformed material from the peak broadening information.

36 According to the CPR, we can participate in the microstructure characterization of pressure tubes materials. Our Laboratory for Testing Materials has IRAM ISO 9001:2008 and IQNet certification and AECL qualification for design, development and technical reports of the following tests: Tensile test and fracture strength (K1; J1; R curve) in metallic materials at low and high temperature. Fatigue crack growth in metallic materials. Determinations of: Vickers micro hardness, Rockwell B, Rockwell C, Brinell and Vickers Hardness. Hydriding: gaseous charge in metallic materials and cathodic charge in Zr and Zr alloys Determination of crack velocity propagation and measurement of the critical stress intensity factor (K 1H ) by delayed hydride cracking in hydride forming alloys. Corrosion tests in autoclave for Hafnium, Zirconium and their alloys. Metallography samples preparation and Vickers micro hardness. Scanning electron microscopy: obtaining micrographs and measurements in all type of materials and Qualitative X - Ray energy dispersive spectroscopy. X- Ray Diffraction in crystalline materials for texture determination, dislocations density and phase distribution in crystalline alloys.