How to model ramping for Nuclear Reactors

General
1

How can I effectively model ramping for small modular nuclear reactors?

Most of the figures I find online are given in % Power/min.

Are the fields I need to populate for this “MaxDownRampDef” and “MaxUpRampDef”?

I tried to enter “FGEN.SMR.PMAXDEF.[kW] * 0.10” to model a 10% ramp rate for each of these fields, however they will not permit entry of anything other than numerical values.

2

Hi @smeloney,

You found the correct property!

I think I can clear up your confusion with few quick notes on Default Event Values vs. Events.

Default Event Values (e.g., MaxUpRampDef):

  • Defined at the network level
  • Must be a numeric value (e.g., 0, 10, 2.75, etc.)
  • Are used in all relevant scenarios unless they are superceded by an Event

Events (e.g., MaxUpRamp):

  • Defined at the scenario level
  • Can be numeric, or can be a Value Expression (e.g., “FGEN.SMR.PMAXDEF.[kW] * 0.10”)
  • Are used in the scenario within which they are defined

Pro tip: Value Expressions can reference Default Event Values (e.g., “FGEN.SMR.PMAXDEF.[kW] * 0.10”) or values after the processing of other Events (e.g., “FGEN.SMR.PMAX.[kW] * 0.10”). This choice is up to the user. Referencing Default Event Values will have a small performance benefit and is generally recommended, but referencing the Event Value directly may be necessary when coordinating multiple changes across different scenarios.

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