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Initiation Of Delayed Hydride Cracking In Zr 25nb Micro Pressure Tubes
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Book Synopsis Initiation of Delayed Hydride Cracking in Zr-2.5Nb Micro Pressure Tubes by : Ravi Kumar Sundaramoorthy
Download or read book Initiation of Delayed Hydride Cracking in Zr-2.5Nb Micro Pressure Tubes written by Ravi Kumar Sundaramoorthy and published by . This book was released on 2009 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure tubes pick up hydrogen while they are in service within CANDU reactors. Sufficiently high hydrogen concentration can lead to hydride precipitation during reactor shutdown/repair at flaws, resulting in the potential for eventual rupture of the pressure tubes by a process called Delayed Hydride Cracking (DHC). The threshold stress intensity factor (KIH) below which the cracks will not grow by delayed hydride cracking of Zr-2.5Nb micro pressure tubes (MPTs) has been determined using a load increasing mode (LIM) method at different temperatures. MPTs have been used to allow easy study of the impact of properties like texture and grain size on DHC. Previous studies on MPTs have focused on creep and effects of stress on hydride orientation; here the use of MPTs for DHC studies is confirmed for the first time. Micro pressure tube samples were hydrided to a target hydrogen content of 100 ppm using an electrolytic method. For DHC testing, 3 mm thick half ring samples were cut out from the tubes using Electrical Discharge Machining (EDM) with a notch at the center. A sharp notch with a root radius of 15 mu m was introduced by broaching to facilitate crack initiation. The direct current potential drop method was used to monitor crack growth during the DHC tests. For the temperature range tested the threshold stress intensity factors for the micro pressure tube used were found to be 6.5-10.5 MPa.m1/2 with the value increasing with increasing temperature. The average DHC velocities obtained for the three different test temperatures 180, 230 and 250oC were 2.64, 10.87 and 8.45 x 10-8 m/s, respectively. The DHC data obtained from the MPTs are comparable to the data published in the literature for full sized CANDU pressure tubes.
Book Synopsis Initiation of Delayed Hydride Cracking in Zirconium-2.5 Wt.% Niobium Pressure Tubes by : Ahmed Fathi Shalabi
Download or read book Initiation of Delayed Hydride Cracking in Zirconium-2.5 Wt.% Niobium Pressure Tubes written by Ahmed Fathi Shalabi and published by . This book was released on 1989 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Initiation of delayed hydride cracking in pressure tubes : review of progress and programs by : M. P. Puls
Download or read book Initiation of delayed hydride cracking in pressure tubes : review of progress and programs written by M. P. Puls and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors by : International Atomic Energy Agency
Download or read book Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors written by International Atomic Energy Agency and published by IAEA. This book was released on 2004 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dated October 2004. With CD-ROM containing additional information inside back cover
Book Synopsis Delayed hydride cracking in russian rbmk zr-2.5 nb pressure tubes by : B. A. Cheadle
Download or read book Delayed hydride cracking in russian rbmk zr-2.5 nb pressure tubes written by B. A. Cheadle and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed hydride cracking (dhc) velocity (axial) at 250 degrees c for zr-2.5nb cezus pressure tube materials by : R. Choubey
Download or read book Delayed hydride cracking (dhc) velocity (axial) at 250 degrees c for zr-2.5nb cezus pressure tube materials written by R. Choubey and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crack initiation at long radial hydrides in zr-2.5 nb pressure tube material at elevated temperatures by : R. Choubey
Download or read book Crack initiation at long radial hydrides in zr-2.5 nb pressure tube material at elevated temperatures written by R. Choubey and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deuterium buildup in pressure tubes arises as a consequence of corrosion on pressure tube surfaces exposed to both the primary coolant and annulus gas. because there is a potential for pressure tube failure by delayed hydride cracking once the solubility limit for hydrogen isotopes in the pressure tube material is exceeded, there is a need to develop a predictive capability for corrosion and deuterium ingress in candu pressure tubes. this predictive capability is being set up through the development of a design equation, beginning with simple empirical correlations but evolving as a model with an increasingly more mechanistic basis as our understanding of the physical processes involved improves. the preliminary version of the design equation described here attempts to account for the observed effects of temperature, neutron flux and water chemistry on corrosion in the primary coolant. functional relationships describing how corrosion varies with temperature, oxide thickness, dissolved oxygen in the water and irradiation are derived using data from out-reactor autoclave tests, in-reactor loop tests and out-reactor autoclave tests using pre-irradiated pressure tube material. deuterium uptake by the pressure tube is accounted for as a percentage of the total amount of deuterium released through the corrosion process. reasonable agreement between predictions of oxide thickness and deuterium concentrations in pressure tubes with actual measurements from bruce pressure tube surveillance examinations is encouraging. the current model predicts that the rate of deuterium ingress in pressure tubes is not constant but increasing with time.
Book Synopsis Delayed hydride cracking during temperature transients in as-manufactured and in hardened Zr-2.5Nb pressure tube material by : R. L. Eadie
Download or read book Delayed hydride cracking during temperature transients in as-manufactured and in hardened Zr-2.5Nb pressure tube material written by R. L. Eadie and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed hydride cracking (dhc) velocity (axial) at 250 degrees celsius for zr-2.5nb chepetski pressure tube materials by : R. Choubey
Download or read book Delayed hydride cracking (dhc) velocity (axial) at 250 degrees celsius for zr-2.5nb chepetski pressure tube materials written by R. Choubey and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed hydride crack velocities in zr-2.5 nb pressure tubes at high stress intensity factors by : G. K. Shek
Download or read book Delayed hydride crack velocities in zr-2.5 nb pressure tubes at high stress intensity factors written by G. K. Shek and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of hydrogen supersaturation on delayed hydride cracking in zr-2.5 nb pressure tubes by : G. K. Shek
Download or read book Effects of hydrogen supersaturation on delayed hydride cracking in zr-2.5 nb pressure tubes written by G. K. Shek and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by cezus by : A. K. Jarvine
Download or read book Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by cezus written by A. K. Jarvine and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Round robin studies of delayed hydride crack velocity in zr-2.5 nb pressure tubes by : G. K. Shek
Download or read book Round robin studies of delayed hydride crack velocity in zr-2.5 nb pressure tubes written by G. K. Shek and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by the chepetski mechanical plant by : A. K. Jarvine
Download or read book Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by the chepetski mechanical plant written by A. K. Jarvine and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Hydride Cracking Velocity and Crack Growth Measurement Using DCPD Technique in Zr-2.5Nb Pressure Tube Material by :
Download or read book Delayed Hydride Cracking Velocity and Crack Growth Measurement Using DCPD Technique in Zr-2.5Nb Pressure Tube Material written by and published by . This book was released on 2000 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Rates of Delayed Hydride Cracking (DHC) in Zr-2.5Nb Alloys--An IAEA Coordinated Research Project by : Christopher E. Coleman
Download or read book Measurement of Rates of Delayed Hydride Cracking (DHC) in Zr-2.5Nb Alloys--An IAEA Coordinated Research Project written by Christopher E. Coleman and published by . This book was released on 2008 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Values of DHC rates in Zr alloys are sensitive to measurement procedures. A standard method has been developed at the laboratories of AECL and evaluated in a round-robin involving ten IAEA member states. Two test materials were used--Zr-2.5Nb pressure tubes in the cold-worked (CANDUTM) and heat-treated (RBMK) conditions. Cracks were grown from fatigued starter cracks in the axial direction on the axial-radial plane of the original tubes. To obtain the maximum value of Vc, specimens were heated to dissolve all their hydrogen, then cooled at 1 to 3°C/min to the test temperature before loading at 15 MPa?m. Although the start of cracking was detected by potential drop, the extent of cracking was measured directly on the crack faces. The values of incubation time to the start of cracking were highly variable but Vc was well behaved. The values of Vc were normally distributed with a range varying from a factor of 1.2 to 5.2. At 250°C the mean value of Vc from 80 specimens of cold-worked material was 8.9(±1.12)x10-8 m/s and from 41 specimens of heat-treated material the mean value of Vc was3.3(±0.64)x10-8 m/s. Tests were also done at six other temperatures between 144 and 283°C, using up to 22 specimens at each temperature. Both materials had an Arrhenius-type temperature dependence, Vc=Aexp(-Q/RT). The use of strictly defined and coordinated experimental procedures gave a consistent set of Vc values, allowing effective comparison of results obtained in different national laboratories and resulting in good correlations between the DHC velocity values and differences in strength, crystallographic texture, and distribution of ?-phase in the test materials.
Book Synopsis Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors. IAEA TECDOC Series by : International Atomic Energy Agency
Download or read book Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors. IAEA TECDOC Series written by International Atomic Energy Agency and published by . This book was released on 2004 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes all of the research work undertaken as part of the IAEA coordinated research program on hydrogen and hydride induced degradation of the mechanical and physical properties of zirconium based alloys, and includes a review of the state of the art in understanding crack propagation by Delayed Hydride Cracking (DHC), and details of the experimental procedures that have produced the most consistent set of DHC rates reported in an international round-robin exercise to this date.
