Reference No: A0554

Extended Power Uprate Stability - Flow Window - MELLLA+ Enhanced Option III

Most BWR operators implementing Extended Power Uprates (EPU) also desire to expand the allowable flow window at full uprated power (e.g. MELLLA+) with higher control rod lines. Operation at such conditions presents a challenge to existing stability solutions. Expected decay ratios can be markedly higher than for traditional MELLLA operation. Further, the possibility of highly unstable conditions can also introduce the phenomenon of mixed mode oscillations where the flow in one or more bundles could undergo diverging oscillations. These factors invalidate the assumptions of the original BWROG Option III Detect & Suppress methodology.

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