Device for limitation of a flow through a density lock for a nuc

Details Device for limitation of a flow through a density lock for a nuc Device for limitation of a flow through a density lock for a nuc

1988-09-30

1990-07-03

Wasil, Daniel

Induced nuclear reactions: processes, systems, and elements

Reactor protection or damage prevention

Emergency core coolant systems

376328, G21C 902

Patent

active

049397540

ABSTRACT:
In a nuclear reactor of the safety type, density locks constitute an important safety function. Two liquid systems can be kept apart by means of density locks. During normal operating conditions, the density locks prevent the warmer water from a primary cooling system from being mixed with the colder water from a secondary cooling system. At an increased temperature level, the density locks permit water to flow through so that the warmer water is mixed with the colder water to reduce the increased temperature level. To prevent an undesired transport through the density locks, for example boric acid leaking in from the secondary cooling system during normal operating conditions, the density locks are provided with a honeycomb consisting of tube pieces assembled in parallel. The honeycomb tube must be much longer than four times the tube diameter. To prevent the occurrence of a resonant interaction between internal waves in the honeycomb tube, the Brunt-Vaisala frequency ##EQU1## must vary through the tubes. This can be achieved by varying the tube area (8,9), by providing the tubes (10) with a partition (11) along half their lengths, or by arranging a relatively small radial thermal flux.

REFERENCES:
patent: 4352778 (1982-10-01), Arnaud et al.
patent: 4363780 (1982-12-01), Hannerz
patent: 4526742 (1985-07-01), Hannerz
patent: 4666654 (1987-05-01), Forsberg
patent: 4783306 (1988-11-01), Vecsey et al.
patent: 4859406 (1989-08-01), Hannerz
"Pressurized Water Reactor Inherent Core Protection by Primary System Thermohydraulics", Babala et al., Nuclear Science and Engr., 3/85, pp. 400-410.

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