Abstract
A reinforced concrete caisson provides an economical underground structure for housing a portion of the Humboldt Bay Nuclear Plant. In addition to housing the nuclear steam supply system, the caisson also serves as part of the pressure suppression containment. The unique differences between this caisson and the conventional marine caissons are pointed out. The caisson was sunk immediately adjacent to an existing steam power plant. Special sinking techniques were used to reduce the surface friction, soil subsidence, and sinking weight. Upon completion, the underground structure served as a foundation for the plant refueling building and 250 ft high ventilation stack. The use of a caisson structure proved to be a sound solution to the varied requirements of plant layout, containment, construction, adjacent foundations, and budget.
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