Conclusions
The results of the comparison of the procedure of [2] to the experimental data on the crisis of heat transfer in bundles rod fuel elements from the domestic and foreign databases show the following:
The formula of the Russian Scientific Center "Kurchatovskii institut" has much better statistical characteristics than Groeneveld's method in generalizing arrays of points on which the basis of the experimental generalization of the thermotechnical safety of domestic VVÉR reactors is based. The use of a shell table for a tube (AECL-86 variant) at low pressure (2–5 MPa) results in overestimation ofq calc/q exp by up to a hundred of percent. At pressures above 12 MPa, however, the calculation is on the average 1.5 times lower than the experimental value.
For simulators modeling the conditions for the appearance of a heat-transfer crisis in PWR and BWR cores, the method of [2] describes well an array of 11,000 points in the Columbia University database. In the case of a triangular arrangement of rods, however, there is a large discrepancy (by up to 40%) between the calculation and experiment. The additional correction [3] of the constantK 2 for bundles did not compensate the systematic underestimation by the calculation (by 37%) for a triangular arrangement of the simulators in the presence of axial nonuniformity of energy release.
Experience in operating domestic power reactors over a period of many years shows that the modern database and accurate empirical correlation make it possible to perform a reliable calculation of the admissible thermal power of rod bundles in a wide range of geometric and operating parameters, spacing methods, and energy-release fields without using the additional procedure of making the transition from a pipe to a bundle.
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Additional information
Institute of Nuclear Reactors, Russian Scientific Center "Kurchatovskii Institut." Translated from Atomnaya Énergiya, Vol. 77, No. 2, pp. 108–111, August, 1994.
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Zhukov, Y.M. Possibility of using tube shell tables for calculating the heat-transfer crisis in rod bundles of water-cooled reactors. At Energy 77, 596–600 (1994). https://doi.org/10.1007/BF02407432
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DOI: https://doi.org/10.1007/BF02407432