Induced nuclear reactions: processes – systems – and elements – With control of reactor – Means to inhibit control rod movement
Patent
1998-11-04
1999-11-02
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
Means to inhibit control rod movement
376215, 376237, G21D 308
Patent
active
059784296
ABSTRACT:
A transiently unstable state of a boiling-water reactor is damped by measuring the oscillating neutron flux and, after a first threshold value is exceeded over a plurality of oscillation periods, the rate of increase of the oscillation is determined. Depending on the slope of the increase, and after a further threshold value (in particular one dependent on the rate of increase) for the oscillating flux is exceeded, a selection is made which one of various stabilization strategies for damping the oscillation should be triggered before a SCRAM becomes necessary. A hierarchy of stabilization strategies is available: blocking a power increase, for instance, in the control system, controlled slow reduction of the power, or rapid power reduction by a "partial SCRAM". The monitoring of the unstable state is effected with a system of sensors strategically distributed throughout the core and which redundantly measure the flux in one region of the core. The sensors act on a plurality of redundantly operating systems, and the signal from each sensor is effective in only one of the redundant systems.
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Kreuter Dieter
Rauch Godehard
Schulze Joachim
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Wasil Daniel D.
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