Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
242 words
A pressurized-water reactor steam generator comprising an upstanding housing having an inside and a lower portion and an upper portion, a tube sheet having a top and a bottom and closing said lower portion, inverted U-shaped tube bundle inside of said housing and having legs with lower ends mounted in said tube sheet via its top, said tube sheet having means for flowing reactor pressurized-water coolant via the tube sheet''s bottom through said tube bundle, a shroud radially enclosing said tube bundle, said housing normally receiving a supply of feed water and said shroud being radially spaced from said housing to form a descent space inside of the housing, said shroud and tube bundle having upper portions and lower portions, and an emergency cold water inlet for said housing for introducing a flow of emergency cold water to said housing in the event said supply of feed water fails, said upper portions of said shroud and tube bundle normally operating at lower temperatures than their said lower portions and said tube sheet; wherein the improvement comprises said emergency cold water inlet being positioned in said upper portion of said housing and said generator having means for directing cold water flowing into said housing through said inlet, so that the cold water initially contacts substantially extended portions of at least one of said upper portions of said shroud and tube bundle before flowing into contact with said lower portions and said tube sheet.
Claim 2
Dependent Claim
242 words
A pressurized-water reactor steam generator comprising an upstanding housing having an inside and a lower portion and an upper portion, a tube sheet having a top and a bottom and closing said lower portion, inverted U-shaped tube bundle inside of said housing and having legs with lower ends mounted in said tube sheet via its top, said tube sheet having means for flowing reactor pressurized-water coolant via the tube sheet''s bottom through said tube bundle, a shroud radially enclosing said tube bundle, said housing normally receiving a supply of feed water and said shroud being radially spaced from said housing to form a descent space inside of the housing, said shroud and tube bundle having upper portions and lower portions, and an emergency cold water inlet for said housing for introducing a flow of emergency cold water to said housing in the event said supply of feed water fails, said upper portions of said shroud and tube bundle normally operating at lower temperatures than their said lower portions and said tube sheet; wherein the improvement comprises said emergency cold water inlet being positioned in said upper portion of said housing and said generator having means for directing cold water flowing into said housing through said inlet, so that the cold water initially contacts substantially extended portions of at least one of said upper portions of said shroud and tube bundle before flowing into contact with said lower portions and said tube sheet.
Claim 3
Dependent Claim
47 words
The steam generator of claim 1 in which said shroud has an outside and a duct extends down said shroud''s outside within said descent space, said duct having an upper end connected with said emergency cold water inlet and a lower end adjacent to said tube sheet.
Claim 4
Dependent Claim
26 words
The steam generator of claim 2 in which said duct is formed by sections having ends which are interspaced to open transversely into said descent space.
Claim 5
Dependent Claim
28 words
The steam generator of claim 2 in which a spout directed horizontally over the top of said tube sheet, is connected to the lower end of said duct.
Claim 6
Dependent Claim
16 words
The steam generator of claim 3 in which said sections'' interspaced ends form downwardly pointing venturies.
Claim 7
Dependent Claim
44 words
The steam generator of claim 1 in which said means comprises an annular series of nozzles inside of said shroud and surrounding and pointing towards said upper portion of said tub bundle, and means for connecting said nozzles with said emergency cold water inlet.
Claim 8
Dependent Claim
54 words
The steam generator of claim 1 in which cyclone water separators are positioned in said housing above said tube bundle and said means comprises pipes connected with said emergency cold water inlet and with said separators to inject said water into said separators rotatively counter to the normal rotative operating directions of said separators.