Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...
Patent
1985-12-09
1988-06-21
Kyle, Deborah L.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
By movement of control element or by release of neutron...
376258, G21C 716
Patent
active
047524332
ABSTRACT:
A vent system for controlling hydraulically actuated drive means for selectively moving pluralities of rod clusters respectively connected to the plurality of drive means between fully inserted positions within the lower barrel assembly of the vessel in telescoping relationship with fuel rod assemblies contained therein, and a fully withdrawn position. Each drive means responds to the reactor coolant fluid pressure and includes a leakage passage and an outlet channel through which a leakage flow may pass under control of the vent system, the latter comprising a valve arrangement, flow restrictors and a common orifice through which the outlet channels are selectively connected to essentially ambient pressure, for establishing a pressure differential within each drive means producing a net force for moving the drive rods and associated clusters to the withdrawn position at which the drive means mechanically latch the fully withdrawn clusters for mechanically supporting same in the fully withdrawn position. The valve arrangement may be selectively actuated to reestablish the pressure differential within each drive means thereby to raise the associated drive rods and release same from the mechanically latched positions, after which the valve arrangement is selectively operated to establish pressure equilibrium within the drive means to permit the corresponding drive rods and associated control rod clusters to fall by force of gravity to the fully inserted positions thereof. Display indications and control panel operation provide for operator sensing of the rod cluster positions and control of the valve arrangement.
REFERENCES:
patent: 3855059 (1974-12-01), Groves et al.
patent: 3957577 (1976-05-01), Treshow
patent: 3989589 (1976-11-01), Frisch
patent: 4030972 (1977-06-01), Groves
patent: 4439054 (1984-03-01), Veronesi
patent: 4550941 (1985-11-01), Veronesi et al.
Altman Denis J.
Lovasic Steven J.
Miller John V.
Morris Allen L.
Rinker Eric D.
Abeles D. C.
Kyle Deborah L.
Wasil Daniel
Westinghouse Electric Corp.
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