Coffer dam for temporary shielding of reactor vessel internals

Details Coffer dam for temporary shielding of reactor vessel internals Coffer dam for temporary shielding of reactor vessel internals

1989-06-19

1991-08-06

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376203, 376292, 2505171, G21C 1100

Patent

active

050376047

ABSTRACT:
A cylindrical coffer dam assembly is described for use in temporary shielding personnel from nuclear reactor stored internals' radiation. The coffer dam is made up of substantially equal segments small enough to pass through the equipment hatch of the reactor containment building. The segments are pre-fabricated at a factory, transported to the plant, introduced individually into the containment building, and assembled together in sealing relation at the operating floor into a complete coffer dam. The coffer dam is moved to the reactor vessel and connected to the reactor vessel upper flange in sealing relation. The coffer dam can be disconnected, disassembled, removed and re-used at other nuclear reactors.

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"In Place Thermal Annealing of Nuclear Reactor Pressure Vessels", NUREG/CR 42/2, EGG-125-6708, 4/85.
Letter dated 2/19/88, Miselis to Del George re Soviet Lecture.

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