Patent US4437933A successfully refreshed from Google Patents.
US4437933A
Expired / Lapsed
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Apparatus for treating radioactive liquid wastes
Assignee: Hitachi Ltd
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Filing: 1982-07-16
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Granted: 1984-03-20
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Expires: 2002-07-16
Abstract
Abstract Liquid wastes from atomic power plants are treated in an apparatus comprising a low electroconductivity liquid waste concentrator for evaporating a low electroconductivity liquid waste with outside steam as a heat source, and another liquid waste concentrator for evaporating another liquid waste with steam generated by evaporation of the low electroconductivity liquid waste in the low electroconductivity liquid waste concentrator as a heat source.
Inventors
- 👤 Ryozo Kikkawa
- 👤 Masaki Takeshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:53
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/08; Y; Y10; Y10S; Y10S159/00; Y10S159/12; Y10S159/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
237 words
An apparatus for treating radioactive liquid waste from atomic power plant, which comprises: a low electroconductivity liquid waste concentrator of the pressurized evaporation type, for evaporating a low electroconductivity liquid waste with outside steam as a heat source at high temperature, a high electroconductivity liquid waste concentrator of the vacuum evaporation type, for evaporating a high electroconductivity liquid waste with the steam generated by evaporation of the low electroconductivity liquid waste, a laundry liquid waste concentrator of the vacuum evaporation type for evaporating a laundry liquid waste with steam generated by evaporation of the low electroconductivity liquid waste, means for supplying steam generated by evaporation in said low electroconductivity liquid waste concentrator to said high electroconductivity liquid waste concentrator as a heat source for low electroconductivity liquid waste concentration, means for supplying steam generated by evaporation in said low electroconductivity liquid waste concentrator to said laundry liquid waste concentrator as a heat source for laundry liquid waste concentration, a low electroconductivity liquid waste condenser for condensing the steam from said low electroconductivity liquid waste concentrator, said high electroconductivity liquid waste concentrator and said laundry liquid waste concentrator, a high electroconductivity liquid waste condenser for condensing the steam from said high electroconductivity liquid waste concentrator, a laundry liquid waste condenser for condensing the steam from said laundry liquid waste concentrator, and means for demineralization of condensed low electroconductivity liquid waste, high electroconductivity liquid waste and laundry liquid waste.
Claim 2
Independent Claim
237 words
An apparatus for treating radioactive liquid waste from atomic power plant, which comprises: a low electroconductivity liquid waste concentrator of the pressurized evaporation type, for evaporating a low electroconductivity liquid waste with outside steam as a heat source at high temperature, a high electroconductivity liquid waste concentrator of the vacuum evaporation type, for evaporating a high electroconductivity liquid waste with the steam generated by evaporation of the low electroconductivity liquid waste, a laundry liquid waste concentrator of the vacuum evaporation type for evaporating a laundry liquid waste with steam generated by evaporation of the low electroconductivity liquid waste, means for supplying steam generated by evaporation in said low electroconductivity liquid waste concentrator to said high electroconductivity liquid waste concentrator as a heat source for low electroconductivity liquid waste concentration, means for supplying steam generated by evaporation in said low electroconductivity liquid waste concentrator to said laundry liquid waste concentrator as a heat source for laundry liquid waste concentration, a low electroconductivity liquid waste condenser for condensing the steam from said low electroconductivity liquid waste concentrator, said high electroconductivity liquid waste concentrator and said laundry liquid waste concentrator, a high electroconductivity liquid waste condenser for condensing the steam from said high electroconductivity liquid waste concentrator, a laundry liquid waste condenser for condensing the steam from said laundry liquid waste concentrator, and means for demineralization of condensed low electroconductivity liquid waste, high electroconductivity liquid waste and laundry liquid waste.
Claim 3
Dependent Claim
51 words
The apparatus according to claim 1, wherein the steam generated by evaporation of the low electroconductivity liquid waste in said low electroconductivity liquid waste concentrator is subjected to increase in pressure and temperature in a compressor, and fed to said high electroconductivity liquid waste concentrator and said laundry liquid waste concentrator.
Claim 4
Dependent Claim
34 words
The apparatus according to claim 1 or claim 2, wherein said low electroconductivity liquid waste concentrator is kept at an inside pressure of about 1 kg/cm 2 at a temperature of about 120° C.
Claim 5
Dependent Claim
45 words
The apparatus according to claim 1 or claim 2, wherein said high electroconductivity liquid waste concentrator and said laundry liquid waste concentrator are kept at an inside pressure of about 0.203--about 0.318 kg/cm 2 absolute and an inside temperature of about 60° C.--about 70° C.
Claim 6
Dependent Claim
65 words
The apparatus according to claim 1, further comprising a low electroconductivity liquid filter operatively connected via valve means to a feed conduit supplying low electroconductivity liquid waste to said low electroconductivity liquid waste concentrator for treating of low electroconductivity liquid waste in excess of that to be concentrated in said concentrator during abnormal operating conditions and during start-up and shut-down of the atomic power plant.
Claim 7
Dependent Claim
83 words
The apparatus according to claim 1, further comprising another low electroconductivity liquid waste concentrator of the pressurized evaporation type connected in parallel with said low electroconductivity liquid waste concentrator for evaporating the low electroconductivity liquid waste with outside steam and conduit means, including valve means, interconnecting said another low electroconductivity liquid waste concentrator to said high electroconductivity liquid waste concentrator of the vacuum evaporation type for treatment of high electroconductivity liquid waste when the amount of high electroconductivity liquid waste is abnormally large.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |