Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Patent
1975-02-03
1977-07-12
Behrend, Harvey E.
Boring or penetrating the earth
Automatic control
In response to drilling fluid circulation
176 36S, 176 86R, G21C 720
Patent
active
040352307
ABSTRACT:
A shock buffer is provided for the gradual deceleration of a rapidly descending control element assembly in a nuclear reactor. The interactive buffer components are associated respectively with the movable control element assembly and part of the upper guide structure independent of and spaced from the fuel assemblies of the reactor.
Preferably, the buffer is of the piston and cylinder type, with a piston extending upward from a tube sheet of the upper guide structure and a cylinder opening downward and carried by the control element assembly near its upper end. The cylinder descends about the buffer piston near the lower extent of control element assembly travel. Liquid naturally occupying the buffer cylinder, as the reactor coolant at the ambient pressure within the reactor, provides hydraulic decelerating forces on the control element assembly when relative insertion of the piston in the cylinder occurs.
REFERENCES:
patent: 3231473 (1966-01-01), Hennig
patent: 3235464 (1966-02-01), Ashcroft
patent: 3346459 (1967-10-01), Prince et al.
patent: 3448006 (1969-06-01), Fortescue et al.
patent: 3481832 (1969-12-01), Rickert
patent: 3595748 (1971-07-01), Frisch et al.
patent: 3607629 (1971-09-01), Frisch et al.
patent: 3625816 (1971-12-01), Aleite et al.
patent: 3734825 (1973-05-01), Schabert et al.
Behrend Harvey E.
Berneike Richard H.
Borst Stephen L.
Combustion Engineering Inc.
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