Authors & Affiliations
Beznosov A.V., Chernysh A.S., Sergeev S.I., Zudin A.I., Bokova T.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Chernysh A.S. – Postgraduate student, Nizhny Novgorod state technical University n.a. P.E. Alekseeva.
Sergeev S.I. – Student, Nizhny Novgorod state technical University n.a. P.E. Alekseeva.
Zudin A.I. – Postgraduate student, Nizhny Novgorod state technical University n.a. P.E. Alekseeva.
Bokova T.A. – Cand. Sci. (Tech.), Senior lecturer, Nizhny Novgorod state technical University n.a. P.E. Alekseeva.
Securing heat removal from lead and lead-bismuth coolants during a reactor shutdown cooling as well as in standby modes when there are considerable after-heat releases traditionally requires complicated, expensive and potentially hazardous solutions due to a high temperature of coolant solidification (Pb-326°C, Pb-Bi-125°C). A similar problem should be addressed while creating installations (benches) for testing main circulation pumps with an adiabatic introduction of heat into the circuit up to approx. 1 MW, their models and other non-isothermal installations (benches).
Using water as a heat-eliminating medium requires high pressures in heat-removing water circuits (to cool down lead coolants close to critical) in order to prevent freezing of the liquid-metal coolant.
To exclude the disadvantages of conventional heat-exchanging systems, it was suggested (Patent RF, no. 2325717 "Nuclear Power Plant") to use a mixture of air and finely-divided water condensate phase as a heat-eliminating medium at a pressure close to atmospheric. By a regulated change in the content of water phase in a flow, it is possible to provide a specified heat removal power and, accordingly, a specified temperature of the liquid metal at the heat-exchanger outlet at a safe low pressure of the heat-eliminating medium close to atmospheric.
The conducted experimental investigations of removing heat from a lead coolant using an air-water flow with water droplets dispersed to 1.0 mm and smaller as well as a long-term experience in operating systems removing heat adiabatically introduced into the circuit due to operation of an electric impeller pump of the lead coolant circuit at the BREST-OD-300 installation for testing and refining models of the main circulation pump blading have confirmed efficiency, simplicity, safety and cost effectiveness of this heat removal method.
The possibility of fine regulating outgoing power without sacrificing the installation safety essentially scales up this type of heat-exchange equipment.
heat exchange, HLMC, mixture, BREST, pump, heat exchanger, lead, steam generator, sprayer, temperature, consumption, atmospheric pressure
1. Beznosov A.V., Pinayev S.S., Molodtsov A.A. et al. Eksperimental'nye issledovaniya kharakteristik kontaktnogo teploobmena svintsovyy teplonositel' – rabochee telo [Experimental Research of Contact Heat Exchange Characteristics; Lead Coolant as a Working]. Atomnaya energiya - Atomic Energy, 2005, vol. 98, no. 3, pp. 182-191.
2. Beznosov A.V., Molodtsov A.A., Semenov A.V. et al. Teplootdacha ot svintsovogo teplonositelya k prodol'no obtekaemoy trube [Heat Transfer from Lead Coolant to Longitudinally Streamlined Tube]. Izvestiya vuzov. Yadernaya energetika - Proseedings of Universities. Nuclear Power Engineering, 2006, no. 4, pp. 83-90.