Izvestiya vuzov. Yadernaya Energetika

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

The research of feasible temperature modes in the ampoule channel with natural circulation

12/25/2015 2015 - #04 Modelling processes at nuclear facilities

Osipova T.A. Valishin M.F. Uzikov V.A. Palachyov P.S.

DOI: https://doi.org/10.26583/npe.2015.4.08

UDC: 621. 039.5

The current research work provides the results of the calculation analysis of the thin-walled samples cooling during reactor irradiation in a double-hulled ampoule channel with a natural convection supply of the heatsink. Making the ampoule channel in the form of a double-hulled construction enables changing thermal resistance of the channel wall thus regulating heat leak out of it by gas composition and pressure in the cavity between the hulls. The aim of the research is to identify possible regimes of sample cooling in the present channel. The calculation analysis was carried out using the thermal-hydraulic code RELAP5/MOD3.2. In the calculations helium and nitrogen are seen as a gas gap between the hulls. There is a demonstration of the main regularities of changing irradiation temperature regimes in relation to the capacity of energy release in the channel construction materials and the irradiation device, the height of the circulation loop and thermal resistance of the channel hull. Varying the height of the circulation loop and the capacity of energy release in the construction materials enables cooling sample regimes in the range from the temperature of the first contour coolant to boiling temperature at a given pressure (50 – 331°С). Without boiling of coolant on the samples at the maximum (8 m) height of the circulation loop at most 55 kW (14 W/g on the samples) is allocated using helium as a channel cavity gas, exploiting nitrogen – 15 kW (3,7 W/g on the samples); at a minimum (1 m) height of the circulation loop no more than 10 kW (2,5 W/g on the samples) and 5 kW (1,2 W/g on the samples), correspondingly.

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research reactor SM ampoule channel with natural circulation research results temperature modes of irradiation