Controlling fuel assembly stability in a boiling water reactor
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United States of America Patent
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Sep 13, 1988
Grant Date -
N/A
app pub date -
Apr 8, 1987
filing date -
Apr 8, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for controlling the stability of a boiling water reactor using a digital computer to calculate on-line, from distributed steady state values of only power, flow, enthalpy and pressure; a stability index for selected fuel assemblies taking into account nuclear feedback as well as detailed hydrodynamic effects. Such calculations are only made for fuel assemblies selected as most susceptible to instability on the basis of the level and axial distribution of power generated. If the least stable fuel assembly is unstable, its stability index is iteratively recalculated using assumed incremental changes in either flow or control rod position until a stable condition is indicated. The cumulative adjustment in flow or rod position required for stability is reported to the operator and can be implemented manually or by an automatic control system.
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