Izvestia Vysshikh Uchebnykh Zawedeniy. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

A study of the gas-water mixture in the rod control cluster assembly sleeve cavity of the RBMK-1000 reactor

3/23/2018 2018 - #01 Physics and technology of nuclear reactors

Belozerov V.I. Milinchuk V.K.

DOI: https://doi.org/10.26583/npe.2018.1.06

UDC: 621.039.526 +620.9+544(075)

The design of the technical device for removing the gas-water medium from the rod control cluster assembly (RCCA) sleeve cavity to the storage pool ladder of the RBMK-1000 rector makes it possible to install a sensor for monitoring the composition of the gas-water mixture. When the absorbing elements move in the RCCA, they rub against the walls of the longitudinal channels made of the aluminum alloy SAV-1. Under mechanical action, the oxide film is partially or completely removed from the channel surface, and the alloy passes into a state without a protective oxide layer. The purpose of the study is to obtain experimental data on the interaction of aluminum alloys SAV-1 and ASD-4 with the aqueous medium of the RCCA sleeve when chemical compounds are present in water that remove the passivating oxide layer (Al2O3) from the metal surface. As chemical activators for the alloys, silicon-containing compounds (sodium water glass, potassium water glass, crystalline sodium metasilicate hydrates) and lime are considered. Reactions of the aluminum alloys in aqueous solutions with sodium and potassium water glass are endothermic, whereas in aqueous solutions of crystalline sodium metasilicate hydrate and lime they are exothermic. The hydrogen yields for the alloys SAV-1 and ASD-4 at 60°C are ~ 0.6 l per 1 g of the reacted metal. The hydrogen formed during the interaction of the aluminum alloy SAV-1 with water is part of the gas-water mixture in the RCCA sleeve cavity. Therefore, the hydrogen formation should be taken into account when monitoring the gas-water mixture in the RCCA sleeve of the RBMK-1000 reactor.

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RBMK-1000 reactor rod control cluster assembly (RCCA) control and protection system (CPS) fuel element absorber element aluminum aluminum alloys SAV-1 and ASD-4 water hydrogen sodium and potassium water glass crystalline sodium metasilicate hydrates lime