Induced nuclear reactions: processes – systems – and elements – Reactor structures – Orifice or fluid control at inlet or outlet of coolant channels
Patent
1986-07-29
1988-05-24
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Reactor structures
Orifice or fluid control at inlet or outlet of coolant channels
376365, G21C 1500
Patent
active
047464887
ABSTRACT:
A nuclear reactor has a pressure vessel containing a core supported by the bed-plate. The bed-plate is arranged for admitting an upward flow of coolant into the core. The coolant, generally pressurized water, collects in an outlet plenum. The core comprises fuel assemblies each having a lower end piece. The bed-plate defines an inner volume containing coolant at a pressure lower than the coolant pressure under said bed-plate; the lower end piece of each of said fuel assemblies has a lower extension having a cross-sectional area smaller than the cross-sectional area of the fuel assembly above the bed-plate, cooperating with said bed-plate to define a passage for said flow of coolant into said core; and said extension is surrounded by an annular chamber communicating with said volume and defined by a downwardly facing external surface of said lower end piece.
REFERENCES:
patent: 3501377 (1970-03-01), Germer
patent: 3658643 (1972-04-01), Spenke
patent: 3736226 (1973-05-01), Sakurama
patent: 3943036 (1976-03-01), Ziegler
patent: 3977439 (1976-08-01), Lambert
patent: 4077835 (1978-03-01), Bishop et al.
patent: 4352778 (1982-10-01), Arnaud et al.
Chiarelli Gerard
Pradal Louis
Behrend Harvey E.
Framatome
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