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Pavlov S.V.,Research Institute of Atomic Reactors
Russian Journal of Nondestructive Testing | Year: 2011

An ultrasonic method for the detection of leaking fuel elements in the structure of the fuel assembly of BB Cyrillic capital letter EP-1000 water-water power reactors is considered. The method is intended for the detection of water passing through a cladding flaw into a fuel element. The calculation and experimental study data for the acoustic channel of the method and the results of testing on radiated fuel assemblies from the Kalinin and Balakovo Nuclear Power Plants are given. The high sensitivity of the developed method is shown experimentally. The boundaries of its applicability are determined. © 2011 Pleiades Publishing, Ltd. Source

Sorokin A.A.,Central Research Institute of Structural Materials Prometey | Margolin B.Z.,Central Research Institute of Structural Materials Prometey | Kursevich I.P.,Central Research Institute of Structural Materials Prometey | Minkin A.J.,Central Research Institute of Structural Materials Prometey | Neustroev V.S.,Research Institute of Atomic Reactors
Journal of Nuclear Materials | Year: 2014

Tensile properties of austenitic stainless steels used for pressure vessel internals of WWER type reactors (18Cr-10Ni-Ti steel and its weld metal) in the initial and irradiated conditions were investigated. Based on the presented original investigations and generalization of the available experimental data the dependences of yield strength and ultimate strength on a neutron damage dose up to 108 dpa, irradiation temperature range 320-450 C and test temperature range 20-450 C were obtained. The method of determination of the stress-strain curve parameters was proposed which does not require uniform elongation of a specimen as an input parameter. The dependences was proposed allowing one to calculate the stress-strain curve parameters for 18Cr-10Ni-Ti steel and its weld metal for different test temperatures, different irradiation temperatures and doses. The dependences were obtained to describe the fracture strain decrease under irradiation at a temperature range 320-340 C when irradiation swelling is absent. © 2013 Published by Elsevier B.V. Source

Zhang J.,University of Michigan | Livshits T.S.,RAS Institute of Geology and Mineralogy | Lizin A.A.,Research Institute of Atomic Reactors | Hu Q.,University of Michigan | Ewing R.C.,University of Michigan
Journal of Nuclear Materials | Year: 2010

Garnet, A3B2X3O12, has a structure that can incorporate actinides. Hence, the susceptibility of the garnet structure to radiation damage has been investigated by comparing the results of self-radiation damage from α-decay of 244Cm and a 1 MeV Kr2+ ion irradiation. Gradual amorphization with increasing fluence was observed by X-ray diffraction analysis and in situ transmission electron microscopy. The critical dose, Dc, for an yttrium-aluminum garnet (Y3Al5O12) doped with 3 wt.% 244Cm is calculated to be 0.4 displacements per atom (dpa). While the doses obtained by ion irradiation experiments of garnets with different compositions (Y2.43Nd0.57)(Al4.43Si 0.44)O12, (Ca1.64Ce0.41Nd 0.42La0.18Pr0.18Sm0.14Gd 0.04)Zr1.27Fe3.71O12, and (Ca 1.09Gd1.23Ce0.43)Sn1.16Fe 3.84O12, varied from 0.29 to 0.55 dpa at room temperature. The similarity in the amorphization dose at room temperature and critical temperature of the different garnet compositions suggest that the radiation response for the garnet structure is structurally constrained, rather than sensitive to composition, which is the case for the pyrochlore structure-type. © 2010 Elsevier B.V. All rights reserved. Source

Oganessian Y.T.,Joint Institute for Nuclear Research | Abdullin F.S.,Joint Institute for Nuclear Research | Bailey P.D.,Oak Ridge National Laboratory | Benker D.E.,Oak Ridge National Laboratory | And 29 more authors.
Physical Review Letters | Year: 2010

The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes 129317 and 129417 were produced in fusion reactions between Ca48 and Bk249. Decay chains involving 11 new nuclei were identified by means of the Dubna gas-filled recoil separator. The measured decay properties show a strong rise of stability for heavier isotopes with Z 111, validating the concept of the long sought island of enhanced stability for superheavy nuclei. © 2010 The American Physical Society. Source

Livshits T.S.,RAS Institute of Geology and Mineralogy | Lizin A.A.,Research Institute of Atomic Reactors | Zhang J.M.,University of Michigan | Ewing R.C.,University of Michigan
Geology of Ore Deposits | Year: 2010

The stability of synthetic REE-aluminate garnets irradiated by accelerated Kr2+ ions and affected by alpha decay of 244Cm (T1/2 = 18. 1 yr) has been studied. The dose of irradiation sufficient for the complete disordering of the aluminate garnet structure is 0. 40-0. 55 displacements per atom. This value increases with rising temperature due to the increasing intensity of recovery from radiation damage to the lattice by heating. The critical temperature above which the structure of REE-aluminate is not damaged by radiation is 550°C. The amorphization dose for aluminates with garnet structure is two to three times higher than of that previously studied ferrites; the critical temperature of both is similar. In resistance to radiation, aluminate garnets do not yield to zirconolite and exceed titanate pyrochlore. Heating to 250°C does not lead to substantial recovery from radiation defects in the garnet structure. The radiation impact on matrices of real actinide (An) wastes is lower than that related to ion irradiation and 244Cm doping, and this facilitates a higher radiation resistance of garnets containing HLW. © 2010 Pleiades Publishing, Ltd. Source

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