Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...
Patent
1991-03-27
1992-07-07
Hunt, Brooks H.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
By movement of control element or by release of neutron...
376230, G21C 716
Patent
active
051280930
ABSTRACT:
A hydraulic system for a control rod drive (CRD) includes a variable output-pressure CR pump operable in a charging mode for providing pressurized fluid at a charging pressure, and in a normal mode for providing the pressurized fluid at a purge pressure, less than the charging pressure. Charging and purge lines are disposed in parallel flow between the CRD pump and the CRD. A hydraulic control unit is disposed in flow communication in the charging line and includes a scram accumulator. An isolation valve is provided in the charging line between the CRD pump and the scram accumulator. A controller is operatively connected to the CRD pump and the isolation valve and is effective for opening the isolation valve and operating the CRD pump in a charging mode for charging the scram accumulator, and closing the isolation valve and operating the CRD pump in a normal mode for providing to the CRD through the purge line the pressurized fluid at a purge pressure lower than the charging pressure.
REFERENCES:
patent: 3347748 (1967-10-01), Olsson
patent: 3843471 (1974-10-01), Bevilacqua
Wilkins et al, Advanced BWR: Design Improvements Build on Proven Technology Nuclear Engineering International, reprint Jun. 1986, pp. 1-7 and drawing entitled "The World's Reactors No. 89".
General Electric Company (GE), BWR/6 Operating Fundamentals, "The Control Rod and Control Rod Drive Mechanism," pp. 1-11, Table 1, FIGS. 1-4; Control Rod Drive Hydraulic System, pp. 1-9, and FIGS. 1-3, undated, provided to GE Customers more than one year ago.
General Electric Company (GE) "ABWR Standard Plant", GE Document 23A6100AB, pp. 4.6-6.1;4.6-7 to 4.6-10; 4.6-24 4.6-25 and 4.6-26 submitted to U.S. Nuclear Regulatory Commission in General Electric Company Advanced Boiling Water Reactor Standard Safety Analysis Report, Docket No. 50-605, dated Sep. 29, 1987.
General Electric Company
Hunt Brooks H.
Schroeder Robert R.
Voss Frederick H.
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