Download or read book Stress corrosion cracking of zircaloys in iodine containing environments written by B. Cox and published by . This book was released on 1974 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture of Zircaloy 2 in an Environment Containing Iodine written by B. van der Schaaf and published by . This book was released on 1974 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many Zircaloy cladding failures and the results of out-of-pile iodine stress corrosion tests are so similar as to suggest that fission of uranium produces enough iodine to attack the cladding locally. This paper presents a study of the effects of iodine on the fracture of Zircaloy-2 sheet being stressed very locally. Discs produced from Zircaloy-2 sheet were bent biaxially by pressing an indentor into the center of the disc. The force necessary to penetrate the discs decreased when either the initial amount of iodine or the temperature was increased, for cold-worked as well as recrystallized Zircaloy-2. Uniaxial short-time creep tests and tests with stressed slotted rings, both performed in environments containing iodine, did not result in stress corrosion cracking.
Download or read book Chemical Aspects of Iodine Induced Stress Corrosion Cracking of Zircaloys written by D. Cubicciotti and published by . This book was released on 1982 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thermodynamics of the zirconium-iodine system are summarized. In the gas phase are four stable species: ZrI4, ZrI3, ZrI2, and ZrI. Their enthalpies of formation and free-energy functions are presented. The only one of those species relevant to stress corrosion cracking (SCC) of zirconium alloys by iodine is the tetraiodide. There are also four solid compounds corresponding approximately in composition to the tetra, tri, di, and monoiodides. Ranges of solid solution composition, enthalpies of formation, and free-energy functions for those phases are given. Thermodynamic information for iodine chemisorbed on zirconium surfaces is also presented. These thermochemical results are used to analyze chemical behavior in situations related to SCC. In particular, reaction of cesium iodide with uranium dioxide in a fuel rod may produce an iodine pressure large enough to result in chemisorbtion of iodine on clean zirconium.
Download or read book Stress Corrosion Cracking of Zircaloy in the Prescence of Iodine written by David Bruce Knorr and published by . This book was released on 1981 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Iodine stress corrosion cracking of as received zircaloy 4 at 700 degrees centigrade and 800 degrees centigrade written by D. Lim and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of iodine stress corrosion cracking (iscc) on the rupture behaviour of candu fuel sheathings at temperatures of 700 degrees c and 800 degrees c in isothermal hold tests were investigated under inert gas conditions. the sheaths were tested in the as-received condition with no braze zones or appendages . a test apparatus and specimen design were developed to provide an environment suitable for iscc during high temperature transient conditions. the burst tests showed that the deformation behaviour of the zircaloy tubes was not influenced by the presence of iodine at 800 degrees c at hoop stresses between 15 mpa-35 mpa, when subjected to temperature ramps of approximately 30 degrees c/s. iscc were observed at 700 degrees c at hoop stresses of 40-60-mpa. a three-fold reduction in sheath strain was observed in specimens which failed by iscc when compared with reference specimens containing no iodine. no significant difference in time-to-failure was observed between the reference specimens and the iodine specimens at both temperatures.
Download or read book Effect of Zirconium Oxide on the Stress Corrosion Susceptibility of Irradiated Zircaloy Cladding written by RF. Mattas and published by . This book was released on 1982 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cladding specimens were obtained from two fuel rods irradiated in the Big Rock Point Reactor to a burnup of ~8 gigawatt days per ton. Both claddings had a uniform, thick (~4 μm) zirconium oxide layer on the inner surface. The significant difference between the two rods was the degree of fission-gas release (0.2 versus 14.3 percent). The high-gas-release rod contained a significantly greater amount of fission-product deposits, and, in some areas, breaks in the inner-surface oxide were observed. The cladding speciments, with the fuel removed, were subjected to stress-rupture tests in an iodine environment using internal gas pressurization to evaluate their stress corrosion cracking (SCC) susceptibility. All tests were conducted at an initial iodine concentration of 0.6 mg/cm2 and a temperature of 325°C. Specimens from the high-gas-release rod exhibited signifciantly increased susceptibility to iodine SCC, with a threshold stress level of ~200 MPa as compared with ~280 MPa in the specimens from the low-gas-release rod. The results suggest that the inner-surface oxide provides a barrier to iodine penetration. Hence, the thick unbreached oxide on the low-gas-release rod provided greater resistance to iodine SCC than the breached oxide on the high-gas-release rod.
Download or read book IODINE STRESS CORROSION CRACKING OF ZIRCALOY 2 CLADDING UNDER NEAR PLANE STRAIN AND LOCALIZED STRESS STRAIN CONDITIONS written by BERNARDO DO NASCIMENTO NOBREGA and published by . This book was released on 1984 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: threshold stress concept for Zircaloys but also in good quantitative agreement with literature data.
Download or read book Iodine stress corrosion cracking of as received Zircaloy 4 at 700 degrees C and 800 degrees C written by D. Lim and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors affecting stress corrosion cracking of zircaloy in iodine vapour written by J. C. Wood and published by . This book was released on 1973 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Iodine Stress corrosion Cracking in Irradiated Zircaloy Cladding PWR BWR written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Irradiated Zircaloy cladding specimens, which had experienced fluences from 0.1 to 6 x 10/sup 21/ n/cm/sup 2/ (E>0.1 MeV), were gas-pressure tested in an iodine environment to investigate their stress-corrosion cracking (SCC) susceptibility. The test temperatures and hoop stresses ranged from 320 to 360/sup 0/C and 150 to 500 MPa, respectively. The results indicate that irradiation, in general, increases the susceptibility of Zircaloy to iodine SCC. For specimens that experienced fluences>2 x 10/sup 21/ n/cm/sup 2/ (E>0.1 MeV), the 24-h failure stress was 177+-18 MPa, regardless of the preirradiation metallurgical condition. An analytical model for iodine SCC has been developed which agrees reasonably well with the test results.
Download or read book Out of Pile Testing of Iodine Stress Corrosion Cracking in Zircaloy Tubing in Relation to the Pellet Cladding Interaction Phenomenon written by M. Peehs and published by . This book was released on 1979 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: To investigate iodine stress corrosion cracking on the behavior of Zircaloy tubing, a standard test procedure with internally pressurized creep specimens (I-SCC standard test) and a split-ring test (I-SCC laboratory test) were developed. The threshold value for brittle cracking in iodine is 10-6 g iodine per square centimetre. The uniform elongation shows a clear minimum in its dependence on strain rate. Basal pole orientations in the range of ±50 to ±70 deg relative to the radial direction are the most I-SCC sensitive textures. The I-SCC process occurs in several stages; incubation, crack nucleation, and propagation. A thermodynamic evaluation indicates that I-SCC only occurs when zirconium iodides condense on the Zircaloy surface. Results show that comparisons of the I-SCC susceptibility of tubing manufactured in different manners should be made at the same point on the strain rate versus uniform elongation curves; for example, at the strain rate with the minimum of uniform elongation.
Download or read book Stress corrosion cracking of zircaloy in iodine a probable failure mechanism in water reactor fuel pins written by A. Garlick and published by . This book was released on 1969 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory study of stress corrosion cracking of zircaloy 2 in iodine at 300 degrees c written by J. C. Wood and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the stress corrosion cracking of zircaloy fuel sheathing in iodine at 573 k written by C. P. Ashdown and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Iodine stress corrosion cracking of as received zircaloy 4 at 700 degrees celsius and 800 degrees celsius written by D. Lim and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Iodine Induced Stress Corrosion Cracking of Zircaloy Fuel Cladding Materials written by and published by . This book was released on 2000 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SCCIG a phenomenological model for iodine stress corrosion cracking of Zircaloy written by A. K. Miller and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
