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Sensitivity Analysis of the Thermal Diffusion Coefficient effect on the Departure from Nucleate Boiling Ratio with the VIPRE code

[+] Author and Article Information
Rosario Delgado-Tardáguila

ENUSA Industrias Avanzadas S.A., c/ Santiago Rusiñol, 12, 28040, Madrid, España
rdt@enusa.es

Marisol Corisco

ENUSA Industrias Avanzadas S.A., c/ Santiago Rusiñol, 12, 28040, Madrid, España
msc@enusa.es

Antonio Espejo

ENUSA Industrias Avanzadas S.A., c/ Santiago Rusiñol, 12, 28040, Madrid, España
are@enusa.es

Daniel Navarro

ENUSA Industrias Avanzadas S.A., c/ Santiago Rusiñol, 12, 28040, Madrid, España
dne@enusa.es

Javier Riverola

ENUSA Industrias Avanzadas S.A., c/ Santiago Rusiñol, 12, 28040, Madrid, España
jrg@enusa.es

1Corresponding author.

ASME doi:10.1115/1.4042358 History: Received July 27, 2018; Revised December 18, 2018

Abstract

One of the limiting conditions during operation of a Pressurized Water Reactor (PWR) is cladding integrity in class I (normal operations) or class II (most frequent). Cladding integrity is limited typically by the Departure from the Nucleate Boiling (DNB) which criterion ensures an appropriate core refrigeration. Adequate heat transfer between the fuel cladding and reactor coolant is achieved by preventing DNB that is avoided if the local heat flux is lower than the critical heat flux. The DNB is estimated though correlations based on several parameters, the Thermal Diffusion Coefficient (TDC) among others. Nevertheless and although the TDC is a variable, the thermal-hydraulic design codes specifically developed for the DNB prediction consider the TDC as a constant. This investigation is founded on a new numerical program developed to explore the effect of the TDC on the DNB. In addition to this, variables as the effect of the Turbulent Momentum Factor (FTM) and the correlation effect has been explored too. The most direct outcome of this research is the substantial extension of the existing studies of VIPRE-W TH code. The results show that TDC has an effect on the DNBR dominated by the radial power distribution. The DNBR increases up to 1.2% when TDC is variable under normal operation radial shapes.

Copyright (c) 2018 by ASME
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