The word “scaling” has continuously interested the OECD/NEA’s working groups (other than the international community) in the area of thermal-hydraulics, i.e., the PWG-2 and the more recent W-GAMA, since the 70s. This is reflected by the V & V activities for system thermal-hydraulics, e.g., -the SOAR on TECC, -the SETF and the ITF’s CCVM, -several ISP reports between 1980 and 2015. The need to clarify scaling issues was at the basis of the 2D/3D Project involving the UPTF, CCTF and SCTF facilities in Germany and Japan. With a similar objective CT were undertaken involving LOFT-SEMISCALE, LOFT-LOBI, and BETHSY-LOBI-LSTF-PSB-SPES. Scaling also constituted an important concern in evaluating the uncertainties that are required with the prediction of system thermal-hydraulic codes, a subject that was discussed in the UMS and BEMUSE Projects (completed 1997 and 2011, respectively). It also is clear that any validated code or model should be applicable to the conditions from the smallest- to the largest-range scale of any given (nuclear thermal-hydraulics relevant) experiment data. After this validation work, however, the validated code or model is not guaranteed to be applicable to all the NPP phenomena. True validation should provide such a guarantee and shall include scaling activities. Notwithstanding those activities, a common understanding of the words ‘scaling’, ‘scaling issue’ and ‘address the scaling issue’ was not then available to the scientific- or technological-communities. This need was reflected in the 2012 yearly W-GAMA meeting; there was a request for the presentation and for the planning of a possible scaling-related activity.

Scaling of T-H Phenomena: Addressing scaling issues and scaled calculations for FC/NC based PWR (1) & (2)

D'Auria F.
Primo
Conceptualization
2018-01-01

Abstract

The word “scaling” has continuously interested the OECD/NEA’s working groups (other than the international community) in the area of thermal-hydraulics, i.e., the PWG-2 and the more recent W-GAMA, since the 70s. This is reflected by the V & V activities for system thermal-hydraulics, e.g., -the SOAR on TECC, -the SETF and the ITF’s CCVM, -several ISP reports between 1980 and 2015. The need to clarify scaling issues was at the basis of the 2D/3D Project involving the UPTF, CCTF and SCTF facilities in Germany and Japan. With a similar objective CT were undertaken involving LOFT-SEMISCALE, LOFT-LOBI, and BETHSY-LOBI-LSTF-PSB-SPES. Scaling also constituted an important concern in evaluating the uncertainties that are required with the prediction of system thermal-hydraulic codes, a subject that was discussed in the UMS and BEMUSE Projects (completed 1997 and 2011, respectively). It also is clear that any validated code or model should be applicable to the conditions from the smallest- to the largest-range scale of any given (nuclear thermal-hydraulics relevant) experiment data. After this validation work, however, the validated code or model is not guaranteed to be applicable to all the NPP phenomena. True validation should provide such a guarantee and shall include scaling activities. Notwithstanding those activities, a common understanding of the words ‘scaling’, ‘scaling issue’ and ‘address the scaling issue’ was not then available to the scientific- or technological-communities. This need was reflected in the 2012 yearly W-GAMA meeting; there was a request for the presentation and for the planning of a possible scaling-related activity.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/941734
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