Safety system grade apparatus and method for detecting a dropped

Details Safety system grade apparatus and method for detecting a dropped Safety system grade apparatus and method for detecting a dropped

1994-01-19

1994-12-13

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

By movement of control element or by release of neutron...

376242, 376258, G21C 706

Patent

active

053735390

ABSTRACT:
A safety system grade dropped rod detection system for a pressurized water reactor (PWR) utilizes core exit thermocouples arranged in multiple trains and hot and cold leg RTDs to generate a safety system grade rod stop signal. The system generates from the temperature signals a relative power deviation (RD) and a curvature index (CI), which is the spatial second derivative of RD for each fuel assembly. The CI signatures not only provide rapid, reliable detection of dropped control rods, but also clearly identify failed and failing thermocouples.

REFERENCES:
patent: 4716009 (1987-12-01), Thaulez
patent: 4983350 (1991-01-01), Foret
patent: 5006301 (1991-04-01), Lexa

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