Sakhipgareev A.R.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
The results of an analysis of the study of heat transfer processes during the steam-gas mixture condensation on the inner surface of finned tubes and on subcooled liquid jets and these processes influence on the performance of a WWER steam generator in an emergency condensation mode is considered in the article.
The jetting of liquid into the volume of hydraulic accumulator of the second-stage filled with a steam-gas mixture can be used to maintain the operability of WWER steam generators in the condensation mode. It can provide continuous cooling of the reactor plant in an emergency. The processes under study are characterized by a flow velocity of jet of less than 1 m/s. This is due to the peculiarities of the operation of passive safety systems and the need to supply the jet in a passive way.
The use of finned heat exchangers located inside the annulus of the containment shell to remove non-condensable gases from WWER steam generators and can ensure their long-term operation in emergency mode.
The processes of condensation of on the jet of subcooled liquid and on the inner surface of finned heat exchange tubes at the parameters typical for a reactor plant after 24 hours the start of the Loss-of-coolant accident and Blackout were studied. Experiments were carried out on the test facility with the working sections “Condensation on jets” and ”Gas removal device”.
The results obtained can be used to verify the calculated codes of emergency situations at NPPs with WWER reactors.
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