[en] This report compares the procedurel requirements and acceptance criteria for radiographic inspections specified in the relevant national and international codes and standards. In particular, detailed analysis of inspection conditions such as exposure arrangements, and contrast requirements are given

[en] This article describes or references requirements which are to be used in selecting and developing ultrasonic examination procedures when examination to any part of this article is a requirement of a referencing Code Section. These procedures are to be used for the ultrasonic examination and the dimensioning of indications fpr comparison with acceptance standards when required by the referencing Code Section. The referencing Code Section should be consulted for specific requirements given in the Spope of this article

[en] The problem of interaction of slow neutrons and moving matter is investigated. As usual, to account for the influence of the medium, the notion of effective potential is used. It is shown that generally speaking the energy of the neutron participating in this interaction changes, which is in agreement with the results of F.Kovalski [1]. For the given potential and a wide range of changes in the parameters of motion this phenomenon is of the pure classical origin. In some very specific cases of accelerated motion of a matter plate, the energy spectra of the neutrons that have experienced interaction are found. Essential quantum effects take place in the reflection of neutrons from an accelerated mirror in the case of its separation from the incident beam. The spectrum of neutron velocities exceeding the allowed classical values is found. Experiments on the observation of changes in the neutron energy following the interaction of the neutron with a moving sample are proposed. (author)

[en] An investigation of the properties of polyethyleneterephthalate track membranes (PET TM) subjected to the plasma RF-discharge treatment in nonpolymerized gases (air, mixture of nitrogen and oxygen in various ratios). The effect of the treatment conditions in plasma on the basic characteristics, size and shape of the membranes, their porosity and flow rate, has been studied. It has been figured out while treating the PET TM by the gases, the etching of a surface layer of the membrane takes place which is accompanied by lessening parameters (gas pressure in the vacuum chamber, discharge power) and on the contents of the plasma forming gas. Increase in the discharge parameters and introduction of oxygen into the gas leads to increase of the etch rate. It is shown that the treatment in plasma of the nonpolymerized gases leads to a formation of asymmetric membranes, i.e. the shape of the PET TM formed in the course of the gas-discharge etching changes. Depending on the selection of the gas-discharge etch parameters, it is possible to make etching either in a part of the channel or over the whole length of the channels of the pores. In both cases asymmetric membranes are formed which possess higher porosity and flow rate. The use of such membranes allows one to raise effectiveness of the filtration processes

[en] The method of the calculations of the double-differential ionization cross sections in fast collisions of ions having the electron numbers N≤10 and atoms with nuclear charge z ≤ 10 is reported. The dependence of such double-differential cross sections on the ejected electron initial state, the projectile velocity νにゅー, and the ionization rates of colliding partners has been investigated. The nature of the electron spectra features in various ranges of the electron energy εいぷしろん_L and the ejection angle χかい_L has been discussed

[en] The Chern-Simons topological term dynamical generation in the effective action is obtained at arbitrary finite density and temperature. By using the proper time method and perturbation theory it is shown that at zero temperature μみゅー² = m² is the crucial point for Chern-Simons term. So when μみゅー² < m², μみゅー influence disappears and we get the usual Chern-Simons term. On the other hand, when μみゅー² > m², the Chern-Simons term vanishes because of nonzero density of background fermions. In particular for massless case parity anomaly is absent at any finite density or temperature. This result holds in any odd dimension both in Abelian and in non-Abelian cases

[en] The large neutron multiplicity counter (LNMC), also known as the 30-gal.-drum neutron multiplicity counter, has now been used successfully by the International Atomic Energy Agency (IAEA) for the Initial Physical Inventory Verification (IPIV) and the first annual Physical Inventory Verification (PIV) of excess weapons plutonium oxide at the Rocky Flats Environmental Technology Site (RFETS). These excess plutonium oxide materials contain a variety of impurities. They are stored two cans to a 10-gal.-drum. The drums contain from 1.3 to 4.0 kg of plutonium. The isotopic declarations vary from can to can but the material averages 6% ²⁴⁰Pu. During the IPIV, 94 samples were measured in the LNMC; 19 were measured during the PIV. The assays for all but a single drum agreed to within three standard deviations of the declared value. This problematic drum could not be measured by the LNMC because of its unusually high neutron emission rate. In this paper we will report on the overall performance of the LNMC in these inspections

[en] Los Alamos National Laboratory produces routine and non-routine hazardous waste as a by-product of mission operations. Hazardous waste commonly generated at the Laboratory includes many types of laboratory research chemicals, solvents, acids, bases, carcinogens, compressed gases, metals, and other solid waste contaminated with hazardous waste. The Los Alamos National Laboratory Environmental Stewardship Office has established a Hazardous Waste Minimization Coordinator to specifically focus on routine and non-routine RCRA, TSCA, and other administratively controlled wastes. In this process, the Waste Minimization Coordinator has developed and implemented a systems approach to define waste streams, estimate waste management costs and develop plans to implement avoidance practices, and develop projects to reduce or eliminate the waste streams at the Laboratory. The paper describes this systems approach

[en] The presentation summarises the results of best estimate calculations carried out with reference to the WWER-1000 Nuclear Power Plant, utilizing a qualified nodalization set-up for the Relap5/Mod3.2 code. The nodalization development has been based on the data of the Kozloduy Bulgarian Plant. The geometry of the steam generator imposed drastic changes in noding philosophy with respect to what is suitable for the U-tubes steam generators. For the secondary side a symmetry axis was chosen to separate (in the nodalization) the hot and the cold sides of the tubes. In this way the secondary side of the steam generators was divided into three zones: (a) the hot zone including the hot collector and the hot l/2 parts of the tubes; (b) the cold zone including the cold collector and the cold 1/2 parts of the tubes; (c) the downcomer region, where down flow is assumed. As a consequence of above in the primary side more nodes are placed on the hot side of the tubes. Steady state and transient qualification has been achieved, considering the criteria proposed at the University of Pisa, utilizing plant transient data from the Kozloduy and the Ukrainian Zaporosche Plants. The results of the application of the qualified WWER-1000 Relap5/Mod3.2 nodalization to various transients including large break LOCA, small break LOCA and steam generator tube rupture, together with a sensitivity analysis on the steam generators, are reported in the presentation. Emphasis is given to the prediction of the steam generators performances

[en] The experiments and the test facilities for the study of the stratification phenomenon in the hot plenum of reactor and the upper parts of the steam generator collectors in a nuclear power plant are described. The aim of the experiments was to define the conditions of the stratification initiation, to study the temperature field in the upper part, the definition of the characteristics in the stratification layer, and also to study the factors which cause the intensity of the stagnant volume cooling