Patent US4024911A successfully refreshed from Google Patents.
US4024911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump shaft seal injection system
Assignee: Combustion Engineering Inc
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Filing: 1974-03-18
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Granted: 1977-05-24
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Expires: 1994-03-18
Abstract
Abstract Apparatus is described for supplying injection liquid to the primary coolant pump shaft seals in a pressurized water nuclear reactor system. The injection liquid is the resultant mixture of liquid extracted from both the upstream and downstream sides respectively of the regenerative heat exchanger in the chemical and volume control system of the plant. The temperature of this liquid is controlled by regulating the liquid proportions admitted in the respective flow streams.
Inventors
- 👤 Alan Wayne Forrest
- 👤 James Paul Pelletier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:02
CPC Classifications
G; G21; G21D; G21D1/00; G21D1/04; G21D1/02; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
In a pressurized water nuclear reactor coolant flow circuit incorporating a pump for circulating coolant through said circuit and a coolant processing system for processing a flow of coolant removed from said coolant flow circuit and readmitting the processed flow to said coolant flow circuit including a charging line for conveying the processed coolant to be readmitted to the coolant flow circuit and a regenerative heat exchanger operative to increase the temperature of the processed coolant in the charging line prior to readmission to said coolant flow circuit, the invention comprising means for supplying high purity coolant to the shaft seal system of said coolant pump, said means including: a. means for extracting low temperature processed coolant from said charging line upstream of said regenerative heat exchanger; b. means for extracting high temperature processed coolant from said charging line downstream of said regenerative heat exchanger; c. means for mixing said low temperature coolant with said high temperature coolant; and d. means for injecting the resultant mixture into said coolant pump shaft seal system.
Claim 2
Dependent Claim
173 words
In a pressurized water nuclear reactor coolant flow circuit incorporating a pump for circulating coolant through said circuit and a coolant processing system for processing a flow of coolant removed from said coolant flow circuit and readmitting the processed flow to said coolant flow circuit including a charging line for conveying the processed coolant to be readmitted to the coolant flow circuit and a regenerative heat exchanger operative to increase the temperature of the processed coolant in the charging line prior to readmission to said coolant flow circuit, the invention comprising means for supplying high purity coolant to the shaft seal system of said coolant pump, said means including: a. means for extracting low temperature processed coolant from said charging line upstream of said regenerative heat exchanger; b. means for extracting high temperature processed coolant from said charging line downstream of said regenerative heat exchanger; c. means for mixing said low temperature coolant with said high temperature coolant; and d. means for injecting the resultant mixture into said coolant pump shaft seal system.
Claim 3
Dependent Claim
31 words
Apparatus as recited in claim 1 including means for regulating the proprotionate amounts of low and high temperature coolant to be mixed in response to the temperature of the resulant mixture.
Claim 4
Dependent Claim
29 words
Apparatus as recited in claim 2 wherein said regulating means comprises a flow regulating valve for controlling the flow of low temperature coolant extracted from said coolant processing system.
Claim 5
Dependent Claim
22 words
Apparatus as recited in claim 2 wherein said regulating means includes means for maintaining the temperature of the resultant mixture substantially constant.
References Cited (Backward Citations)
US3651866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |