On-line monitoring and analysis of reactor vessel integrity

Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Vessel monitoring or inspection

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376247, G21C 1700

Patent

active

048014214

ABSTRACT:
A real time analysis of nuclear reactor vessel integrity is preformed by monitoring reactor coolant temperature and pressure and fast neutron fluence, and generating therefrom a visual comparison of the reference nil-ductility transition temperature, RT.sub.ndt, required for flaw initiation and the actual RT.sub.ndt through the entire depth of the vessel wall at selected critical locations. When flaw initiation is indicated at any depth, the RT.sub.ndt required for flaw propagation arrest is also generated and displayed. A display can also be generated to provide guidance for optimum performance during heatup and cooldown. Thermocouples located at the reactor core inlet are used in conjunction with the resistance temperature detectors, RTDs, conventionally provided in the cold leg conduits to generate a more accurate measurement of the coolant temperature at the critical locations in the vessel. Under stagnant flow conditions a correlation is applied to the RTD readings to provide the best estimate of coolant temperature at the critical locations.

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Method for Fracture Mechanics Analysis of Nuclear Reactor Vessels Under Severe Thermal Transients, C. B. Buchalet et al., 8/75.
Fracture Mechanics Evaluation of Heating the Refueling Water Storage Tank for the H. B. Robinson Reactor Vessel Beltline Following a Postulated Small Loca Transient, P. L. Turner et al., Required RT.sub.NDT Analysis--T. A. Meyer et al., 4/83.

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