Inlet nozzle assembly

Patent · Tue Mar 31 00:00:00 EST 1987

OSTI ID:6612742

Knight, R C; Christiansen, D W; Karnesky, R A; Precechtel, D R; Smith, B G

A nozzle assembly is described for directing coolant into the duct tube of a fuel assembly attached thereto comprising: an elongated shell having inlet openings adjacent one end thereof for admitting coolant thereinto; an orifice plate assembly in the shell downstream of the inlet openings, neutron shielding means in the shell downstream of the orifice plate assembly; diffusing means in the shell downstream of the neutron shielding means for dispersing the coolant uniformly through the duct tube; the orifice plate assembly comprising separable stacked orifice plates having differently configurated and sized openings, respectively, for directing the coolant therethrough in a predetermined flow pattern. One of the orifice plates includes means for imparting a spiral flow to the coolant, and the shielding means includes a shield block having a central passage for conveying the coolant in a spiral path therethrough. The central passage has at one end thereof a converging inlet adjacent the one orifice plate. The shield block is formed with an annular well surrounding the central passage, and a partition defining in part the central passage and separating the well from the passage.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4654194
• Application Number: TRN: 87-018241
• OSTI ID: 6612742
• Resource Relation: Patent File Date: Filed date 9 Sep 1985
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
FUEL ASSEMBLIES
COOLANTS
NOZZLES
ANNULAR SPACE
DUCTS
FLUID FLOW
INTAKE STRUCTURES
NEUTRONS
ORIFICES
SHIELDING
TUBES
BARYONS
CONFIGURATION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
MECHANICAL STRUCTURES
NUCLEONS
OPENINGS
SPACE
220300* - Nuclear Reactor Technology- Fuel Elements