Thermal insulating barrier and neutron shield providing integrat

Details Thermal insulating barrier and neutron shield providing integrat Thermal insulating barrier and neutron shield providing integrat

1995-07-13

1997-12-16

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor protection or damage prevention

Shield or barrier between radiation or heat source and...

376283, 376299, 376280, G21C 1518

Patent

active

056993943

ABSTRACT:
The reactor vessel of a nuclear reactor installation which is suspended from the cold leg nozzles in a reactor cavity is provided with a lower thermal insulating barrier spaced from the reactor vessel to form a chamber which can be flooded with cooling water through passive valving to directly cool the reactor vessel in the event of a severe accident. The passive valving also includes bistable vents at the upper end of the thermal insulating barrier for releasing steam. A removable, modular neutron shield extending around the upper end of the reactor cavity below the nozzles forms with the upwardly and outwardly tapered transition on the outer surface of the reactor vessel, a labyrinthine channel which reduces neutron streaming while providing a passage for the escape of steam during a severe accident, and for the cooling air which is circulated along the reactor cavity walls outside the thermal insulating barrier during normal operation of the reactor.

REFERENCES:
patent: 4061535 (1977-12-01), Nolan et al.
patent: 4574070 (1986-03-01), Blaushild et al.
patent: 4797247 (1989-01-01), Blaushild et al.
patent: 5268944 (1993-12-01), Ekeroth et al.
patent: 5343506 (1994-08-01), Artnik et al.

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