Lower end fitting with multistage flow diffusers

Details Lower end fitting with multistage flow diffusers Lower end fitting with multistage flow diffusers

1991-09-20

1993-10-19

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Orifice or fluid control at inlet or outlet of coolant channels

376443, 376444, 376287, G21C 104

Patent

active

052552977

ABSTRACT:
An improved lower end fitting 10 (L.E.F.) having a bell mouth multistage type of flow jet diffuser 30 with stages 31, 31' decreases pressure drop 15-20% over a single stage bell mouth diffuser and more evenly distributes flow and adds strength. It includes neutron thimble flux impingement shield 50 of instrument and/or cable. Each diffuser stage 31, 31' is S.S., of circular cross-sect. and parabolic to optimize diffusion. The multistage shape is based on lower core plate 20 flow hole 24 geometry, L.E.F. design and reactor flow rate. Thinner L.E.F. legs 36, smaller L.E.F. gussets 38 and thinner L.E.F. flow plates 22 are possible.

REFERENCES:
patent: 4678627 (1987-07-01), Rylatt
patent: 4888149 (1989-12-01), Bryan
patent: 4975241 (1990-12-01), Haslinger et al.
patent: 4997621 (1991-03-01), Johansson et al.
patent: 5071617 (1991-12-01), Bryan et al.
patent: 5132077 (1992-07-01), Bryan

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