Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Expansion means
Patent
1985-05-02
1987-06-09
Kyle, Deborah L.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Expansion means
376364, 376434, 376446, G21C 332
Patent
active
046719245
ABSTRACT:
An improved top nozzle includes leaf spring assemblies interposed between its movable upper hold-down plate and stationary lower adapter plate and arranged along respective peripheries thereof. The leaf spring assemblies bias the upper hold-down plate in an upward direction into contact with the upper core plate of the reactor and thereby impose a hold-down force on the fuel assembly via the lower adapter plate. In the preferred embodiment, each leaf spring assembly includes opposite lower and upper ends, with the lower end being attached to the lower adapter plate adjacent one of the corners on its periphery and the upper end being movably coupled in a groove on the upper hold-down plate adjacent a next one of the corners on its periphery. The leaf spring assemblies are arranged in a single file about the peripheries of the lower adapter plate and upper hold-down plate, with one assembly extending between each pair of succeeding corners on the respective peripheries of the lower and uper plates. In an alternative embodiment, a pair of leaf spring assemblies are interposed between the peripheries of the upper and lower plates. Each leaf spring assembly is generally L-shaped and includes opposite spaced apart upper ends and a lower end located between upper ends, with the lower end being attached to the lower adapter plate periphery adjacent one corner of an opposite pair of the corners thereof and the upper ends being movably coupled in grooves defined on the upper hold-down plate periphery adjacent both corners thereon being located on either side of the one corner on the adapter plate periphery.
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Nuclear Energy, 1980, vol. 19, Oct., No. 5, 335-346.
Gjertsen Robert K.
Wilson John F.
Kyle Deborah L.
Wendtland Richard W.
Westinghouse Electric Corp.
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