No abstract available

[en] This final document package gives the results of the thermal test carried out on the DN 3405B assembly provided by Gravatom Projects Ltd. It includes a comprehensive quality plan. (Author)

[en] The detailed experimental results have revealed a good physical understanding of heat-transfer processes both inside and outside the flask. The contribution of some processes is at present unquantifiable, but small adjustments to factors enables accurate predictions to be made. The knowledge gained will enhance the design of new flasks. Measured temperatures fit predicted variations to better than 1⁰C standard deviation, and absolute temperatures can be predicted to about 5⁰C accuracy. 2 references, 6 figures

[en] A series of tests has been performed on simulated divertor elements for NET at the JET neutral beam injector test bed. The test section consisted of a water cooled main structure, the surface of which was protected with a carbon based armour in the form of tiles. The scope of these was to study the thermal behaviour of mechanically attached tiles with the use of an intermediate soft carbon layer to improve the thermal contact under divertor relevant conditions. (author). 4 refs.; 4 figs.; 1 tab

[en] Absorption of laser radiation flux by the material produces temperature rise and variations of emittance are observed by optical detection of infra-red radiation. After encouraging simulations on a three-dimensional model, satisfying results are obtained on samples with cracks which are emerging or covered by a thin coating of oxide. 13 figs., 5 refs

[en] Ballooning tests on Zircaloy-4 fuel sheaths have been done in the temperature range 450 to 900 deg C at a heating rate of 0.5 deg C.s^-1. These tests, plus previously reported ones done at 25 deg C.s^-1, have been analysed using the strain rate equation: epsilon = A exp(-Q/RT)(σ sub(a)-σ sub(i)) sup(n) where A is a constant, Q is the activation energy for the dominant deformation mechanism, R is the gas constant, T is absolute temperature, σsub(i) is the internal stress which is controlled by work hardening and recovery processes. The analysis confirms that the above equation can describe transient experiments such as ballooning tests. It also confirms that the description used for the variation of the internal stress in as-received fuel sheaths is reasonable. The activation energy for α-phase deformation is about 288 kJ.mol^-1.K^-1 (Q/R = 34700 K) and the stress exponent is about 5.3. (author)

[en] This report describes the irradiation conditions for thermal testing of helium-cooled metallic disk targets that was conducted on March 9, 2016, at the Argonne National Laboratory electron linac. The four disks in this irradiation were pressed and sintered by Oak Ridge National Laboratory from molybdenum metal powder. Two of those disks were instrumented with thermocouples. Also reported are results of testing a fast-acting-valve system, which was designed to protect the accelerator in case of a target-window failure.

[en] A nuclear spent fuel cask that employs air or an inert gas such as helium as the cooling medium in the fuel cavity is commonly known as a ''dry'' cask. The thermal characteristics of a dry cask differ considerably from a wet cask. A gas is a poorer heat transfer medium than water. As a result, the fuel and cask basket temperatures will be higher for a given fuel heat level. The response characteristics during operating transients will also differ. Detailed thermal tests on a dry cask were performed to verify design parameters and to obtain operational data for shipping and unloading. Results of a number of thermal tests performed on the NL1 ¹/₂ legal weight truck cask are presented. The uniqueness of these tests are that they were performed using a full-scale geometric and thermal mockup of a nuclear fuel assembly. This results in more realistic fuel and basket temperatures being measured than those obtained using a simpler, single heater assembly

No abstract available

[en] The applicability of graphite as a material for collector probes in plasma experiments was investigated. Four different types of graphite (vitreous, pyrolytic, fine-grain graphite, and a graphite foil) were studied, and compared with a silicon single crystal for the sake of reference. Bulk and surface impurities of the samples could be reduced by heating. As collector probes exposed to a plasma may receive high heatloads, the thermal behavior of metal layers deposited on the surface was studied. Heating of such samples was found to lead to the formation of droplets of significant size, suggesting that quantitative probe analysis may often require a technique sensitive to relatively large depths. Thus, a comparison was made between PIXE and RBS analysis of collector probes. Finally, from the material point of view the problem of converting measured amounts of deposits into actual fluxes incident on to the probe surface was discussed. (orig.)