A Technical Basis for the Flux Corrected Local Conditions Critical Heat Flux Correlation

Abstract

The flux-corrected local conditions CHF correlation was developed at Ontario Hydro in the 1980's and was demonstrated to successfully correlate the Onset of Intermittent Dryout (OID) CHF data for 37-element fuel with a downstream-skewed axial flux distribution. However, because the flux correction factor appeared to be ad-hoc, albeit a successful modifying factor in the correlation, there was reluctance to accept the correlation more generally. This paper presents a thermalhydraulic basis, derived from consideration of two-phase flow acceleration, that supports the appropriateness of the flux correction as a local effects CHF modifying factor.