Improved method for calculating the radiation heat generation in the BOR-60 reactor
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oved Method for Calculating the Radiation Heat Generation in the BOR60 Reactor A. V. Varivtsev* and I. Yu. Zhemkov JSC “SSC RIAR,” Dimitrovgrad10, Ul’yanovsk oblast, 433510 Russia *email: [email protected] Received May 30, 2012
Abstract—The results of theoretical and experimental studies aimed at determining the radiation heat gen eration in the BOR60 reactor reveal the drawbacks of the computational methods used at present. An algo rithm that is free from these drawbacks and allows one to determine the radiation heat generation computa tionally is proposed. Keywords: irradiation device, radiation heat generation, calorimeter, gamma quantum, gamma radiation, fis sion products. DOI: 10.1134/S1063778814140087
INTRODUCTION The research and development activities in support of the projects of advanced fastneutron nuclear reac tors have intensified greatly in recent years. Reactor tests of novel construction materials designed to with stand severe operating conditions constitute a consid erable part of these activities. The validation of the guaranteed service life of assembly components and devices made from these materials requires reliable data on the changes in their initial structure, mechanical properties, and chemical composition induced by the reactor radiation, tem perature, and environment. Such data may be obtained only in the process of reactor tests of samples of these materials under specific conditions with con trolled parameters. Of all the Russian research reactors, the one that provides neutronphysics characteristics (NPCs) and temperature regimes that are the most suitable for test ing the fast reactor materials is the BOR60 fastneu tron research reactor. At the same time, the capabili ties of the BOR60 in terms of monitoring the irradia tion conditions are, for a number of reasons, limited. Hence, the computational methods for determining the parameters of tests of material samples (in partic ular, such an important parameter as the temperature of irradiated samples) require constant improvement. The temperature of irradiated samples depends on the design of the irradiation device (ID) used and the radiation heat generation both in the samples them selves and in the device materials. Therefore, the prob lem of improving the accuracy of calculation of the irradiated sample temperature is related to the prob
lem of reducing the uncertainty in computational esti mates of the radiation heat generation in IDs. The present paper details the results of studies aimed at refining the method for calculating the radi ation heat generation in the BOR60 reactor with the use of modern software packages and experimental data. 1. EXPERIMENTAL The calculation methods may be refined only with the use of experimental data obtained as a result of direct incore measurements. However, reactor exper iments require extensive planning, the development and construction of a specialized experimental device (ED), and considerable material resources and reactor time. In addition, the irradiation time
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