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Negative powers in GCMR models #734

@YaqiWang

Description

@YaqiWang

Reason

The gold files in microreactors/gcmr/assembly/Flow_blockage_transient/gold/Griffin_transient_csv.csv and microreactors/gcmr/assembly/RIA_transient/gold/Griffin_transient_csv.csv contains negative powers and the original author had to add PowerDensity/terminate_on_negative_power=false to let Griffin not issue an error. This is not correct and should be fixed.

Design

This is likely due to large time step size with positive reactivity. The test can be fixed by either using smaller time step size or use IQS (improved quasi-static).

Impact

Fix a model with wrong results.

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