Izvestia Vysshikh Uchebnykh Zawedeniy. Yadernaya Energetika

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

Regulation of the temperature in the ampoule channel with natural circulation of coolant

11/28/2017 2017 - #04 Physics and technology of nuclear reactors

Osipova T.A. Starkov V.A. Uzikov V.A.

DOI: https://doi.org/10.26583/npe.2017.4.02

UDC: 621.039.5

It is shown by calculations that for the proposed hydraulic circuit, it is possible to expand significantly the possibilities of the temperature regime regulation of the samples in the ampoule channel with coolant natural circulation. The proposed hydraulic circuit consists in changing the geometry of the circulation loop by creating a bypass section for the heat removal that is formed in the upper part above the flow restrictor, that improves the regulation of the temperature conditions compared to regulation only by changing the heat conductivity of the gas gap of the channel body (pressure or gas composition). The ampoule channel is irradiated in the reflector cell of the reactor SM-3. The test conditions, the scheme and thermal-hydraulic model of ampoule channel for the code RELAP5/MOD3.2 are presented. The influence of the bypass cooling circuit on the temperature conditions while samples irradiation in the ampoule channel has been studied in this work. The bypass flow rate is changed by varying the size of the flow area of the hole in the flow limiter. The variants of filling the gas gap of the channel housing with helium and a mixture of helium and nitrogen are considered. The calculation showed that the power removed by bypass line can be up to 40% of the total heat capacity of the channel. When using helium as a gas in the channel gap, regulation of the samples temperature is carried out in a wider range (200 – 330°C) than when using a gas mixture with a lower thermal conductivity (279 – 330°C). The main change in temperature occurs when the gap area in the flow limiter is less then (0.2-0.3) cm2. Further increase of the gap area in the flow limiter does not lead to a significant change in the coolant temperature around the samples.

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research reactor SM ampoule channel with natural circulation research results temperature regimes of irradiation power of energy release