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VAPEX CODE FOR ANALYSIS OF STEAM EXPLOSIONS UNDER SEVERE ACCIDENTS

DOI: 10.1615/ICHMT.1995.RadTransfProcHeatMassTransfSevNuclReactAcc.410

Bulat I. Nigmatulin
Experimental Scientific-Research Center—All-Russian Scientific-Research Institute of Atomic Power Plants, Moscow, Russia

V. L. Melikhov
Research & Engineering Centre of Nuclear Plants Safety, 142530 Electrogorsk, Bezymyannaya 6, Moscow Region, Russia

O. L. Melikhov
Research & Engineering Centre of Nuclear Plants Safety, 142530 Electrogorsk, Bezymyannaya 6, Moscow Region, Russia

Resumo

This paper is devoted to the presentation of steam explosion investigations implemented in EREC. It is given a description of the VAPEX code developed in EREC to simulate steam explosions under NPPs severe accidents conditions. Mathematical models of steam explosions (both premixing and propagation) developed for the VAPEX code are presented. Numerical aspects of the VAPEX code are given. Verification of VAPEX code on the experimental data for premixing and propagation is described. Sample calculations of ex-vessel steam explosions under LWR conditions are given.

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