Methods for protection of nuclear reactors from thermal hydraulic/neutronic core instability
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United States of America Patent
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Dec 5, 2023
Grant Date -
Jul 22, 2021
app pub date -
Dec 28, 2020
filing date -
Mar 16, 2012
priority date (Note) -
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Abstract
The invention relates to methods for protecting a nuclear reactor core, such as a boiling water reactor core, from fuel and cladding damage due to thermal hydraulic instability in extended operating power flow conditions and, in particular, when an extended power uprate is implemented. The methods employ existing licensed stability methodologies and incorporated minor changes, e.g., to the Average Power Range Monitor (APRM)-based trip system to preclude operation inside the stability vulnerable region of the power/flow map. The APRM-based trip system is modified to set down the APRM flow-biased scram line when core flow is less than a predetermined core flow to prevent the core from entering an unstable region of operation.
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