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Том 120, № 5 (2016)

Articles

Fundamental Principles of the Formation of an Efficient Fuel-Cycle Structure for Nuclear Power

Tsibul’skii V., Andrianova E., Davidenko V., Rodionova E., Tsibul’skii S.

Аннотация

The growth prospects for nuclear power are examined: impeding and driving forces. The main problem facing nuclear power today is the management of spent fuel and wastes. Eventually, it will become economically inexpedient to store spent fuel; the natural solution is to reprocess spent fuel, extract the fi ssile isotopes, and recycle it in thermal or fast reactors. Since the fast-reactor fraction in the current system is trivial and the situation will remain the same in the near- and medium-term futures, a variant of plutonium recycling in thermal reactors with a different fuel arrangement is examined. It is shown that a heterogeneous fuel arrangement can give a 10-fold reduction of the radiation load in reprocessing enterprises. Different setups are compared in terms of the potential danger presented by spent-fuel reprocessing. The advantages of the thorium fuel cycle are examined from the standpoint of radiation and environmental safety.

Atomic Energy. 2016;120(5):299-304
pages 299-304 views

Article

Application of Surface Harmonics in the Stepan Code

Balygin A., Gol’tsev A., Kovalishin A., Krayushkin A., Laletin I., Sultanov N., Tishkin Y., Tsvetkov T.

Аннотация

The results of a calculation of critical assemblies and an RBMK core using the STEPAN-MPG code are presented. It is shown that the computational results obtained by calculating the surface harmonics are identical to the measurements for critical assemblies and for real states of an RBMK core without the use of adjustable parameters. In addition, the method of surface harmonics makes it possible to perform a fuelelement-wise calculation of the energy release distribution in any RBMK cell by using neutron fl uxes obtained from coarse-grid calculations.

Atomic Energy. 2016;120(5):305-311
pages 305-311 views

Three-Dimensional Neutron-Physical Methodology for Calculating a Nuclear-Reactor Cell with Axial Symmetry and Finite Step Along the Axis

Poveshchenko T., Laletin N.

Аннотация

A methodology for performing three-dimensional calculations of a cell in a nuclear reactor with axial symmetry and a fi nite step along the axis is presented. It is based on a method developed for reactors with a close VVER-type lattice for solving the three-dimensional neutron-transport equation in a cell by separation of variables. A method of calculating the trial functions used at the level of three-dimensional calculations of reactors with axial symmetry by the method of surface quantities is proposed. The results show that if a zone with a large step along the axis is to be calculated, then the corrections associated with the curvature of the neutron fl ux are signifi cant and must be taken into account at the level of core calculations.

Atomic Energy. 2016;120(5):312-317
pages 312-317 views

Dependence of Control-Rod Efficiency on the Initial Conditions of Rod Motion

Seleznev E., Chernova I.

Аннотация

The effectiveness of control rods is measured in a nonstationary regime at minimum reactor power. The measurement algorithm entails a buildup of reactor power caused by lifting of the measured or any other rod followed by its release, which is due to the need to maintain a detector signal above the background level up to the end of the experiment. It is known that some fission neutrons (the prompt neutrons) are created directly during nuclear fission while others are formed from the decay of the precursors of delayed neutrons, which possess a low-energy spectrum or lower average energy. For fast reactors, this can be reflected on the efficiency of the control rods during measurements and during the development of the processes occurring during an accident. This work is devoted to determining the effect of the conditions preceding the movement of control rods on their effectiveness and the discrepancy between the efficiency of the rods realized in practice and the efficiency calculated on the basis of stationary states.

Atomic Energy. 2016;120(5):318-322
pages 318-322 views

Determination of the Parameters for Fuel Assembly Tests in a Pulsed Graphite Reactor

Vityuk V., Vurim A., Kotov V., Pakhnits A.

Аннотация

This article is devoted to the development and testing of a new approach to the determination and prediction of the power parameters of tests of model fuel assemblies in the IGR reactor. A method based on the establishment of a relation between the thermophysical and power parameters of fuel assemblies is proposed. The results of experiments performed as part of the preparation of the fuel assemblies for the tests are presented. The power release in fuel assemblies and a relation between the power parameters of IGR and fuel assemblies at different levels of power release in the reactor are determined. The results obtained are used to determine the IGR operating regime in tests with melting of the fuel assemblies.

Atomic Energy. 2016;120(5):323-327
pages 323-327 views

Experimental Investigations of Heat Transfer Upon Sodium Boiling in a Model Fuel Assembly for Safety Validation of an Advanced Fast Reactor

Khafizov R., Rachkov V., Poplavskii V., Sorokin A., Ashurko Y., Volkov A., Ivanov E., Privezentsev V.

Аннотация

A structural concept using a sodium cavity located above the core of a reactor is proposed as a means of preventing accidents resulting in the destruction of core elements. The experimental investigations of heat transfer performed on the AR-1 stand with boiling of sodium in a model fuel assembly of a fast reactor with a sodium cavity above the core in a regime with natural circulation have shown that long-time cooling of fuel assemblies is possible. The data obtained are used to refine the computational model of sodium boiling in fuel assemblies and to verify the COREMELT computational code.

Atomic Energy. 2016;120(5):328-334
pages 328-334 views

Methods of Thermomechanical Reliability Validation of Thermal Water-Moderated and Water-Cooled Reactor Cores

Barinov A., Dmitriev S., Khrobostov A., Samoilov O.

Аннотация

Methods of validating the thermomechanical reliability of the core of water-moderated and -cooled reactors that are used in reactor design practice are reviewed. The factors determining the thermomechanical reliability of the core and the particulars of the calculation of its criteria in using deterministic and statistical methods are examined. The advantages and disadvantages of different statistical approaches to taking account of the computational uncertainties are indicated. The particularities of using different methods for validating the thermomechanical reliability and their role in the reactor design process are colligated.

Atomic Energy. 2016;120(5):335-341
pages 335-341 views

Implementation of the Protection Optimization for Normalization of Radiation Conditions in BSKH-3A

Sukhoruchkin A., Stepennov B., Fedoseenkov A., Kulikov K., Zaochinskii S., Ivanov A., Lesokhin B.

Аннотация

The radiation conditions in the dry-storage block for spent nuclear fuel BSKh-3A was characterized by a high dose rate and allowed only brief admission of workers. The plan to normalize the radiation conditions included repeat replacement of workers, whose individual dose limit has been exhausted, and on the whole did not conform to the principle of protection optimization. Analysis of the design and radiation state of BSKh-3A has shown that possibilities for reducing the worker dose do exist. At the stages of current planning and actual performance of the work, it was possible to make changes in the technology used in the work, reduce labor costs, and add and optimize additional protection. As a result, the work was performed in accordance with the radiation safety norms and regulations, worker replacement was not required, and the collective dose was reduced more than 20-fold compared with the nominal level.

Atomic Energy. 2016;120(5):342-349
pages 342-349 views

Review and Analysis of the Principles and Methods of Determining the Cost of Equipment Developed For Objects Using Atomic Energy

Gol’tsov A., Molokanov N.

Аннотация

The principles and methods of determining at the design and construction stages the cost of equipment for objects using atomic energy are examined. The essence of different approaches to equipment evaluation is shown, the advantages and disadvantages of the methods are analyzed, and application recommendations are made for specific conditions of evaluation. The price variation of different equipment for the period 2000–2015 and the computational accuracy as a function of the design stage are presented. The application of particular cost estimation methods is analyzed taking account of industry specifics for equipment design and manufacture.

Atomic Energy. 2016;120(5):350-360
pages 350-360 views

Burnup Time Dependence of the Axial and Radial Nonuniformity of the Plutonium Isotope Distribution in RBMK-1000 Fuel Assemblies

Kolesov V., Belozerov V., Timofeev S., Samokhin D., Geraskin I.
Atomic Energy. 2016;120(5):366-368
pages 366-368 views

Scientific and Technical Communications

Investigation of Solid Disperse Coolant Flow for Advanced Nuclear Reactors

Afonin A., Levshin N., Mel’nikov G., Soldatkin D., Fedik I.
Atomic Energy. 2016;120(5):361-365
pages 361-365 views

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