Task completion report for investigating why output signal-variable values differ from their output component-parameter values in test problem MST2

Technical Report · Wed Sep 10 00:00:00 EDT 1997

DOI:https://doi.org/10.2172/658392· OSTI ID:658392

Steinke, R G

Signal-variable values and their component-parameter values differ in an end-of-timestep edit to the TRCOUT and TRCGRF files because signal variables have beginning-of-timestep values, and component parameters have end-of-timestep values. Oscillatory divergence in the MST2 standard test problem after 9000 s occurs because of TRAC-P`s numerical evaluation at a 1000 material Courant number. The magnitude of that divergence has diminished by a factor of 3.5 from Version 5.3.01 to 5.4.15 and by a factor of 25 from Version 5.4.15 to 5.4.28. That divergence can be eliminated by evaluating MST2 with a maximum material Courant number of 500.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 658392
• Report Number(s): LA-UR-98-99; ON: DE98005314; TRN: 98:011287
• Resource Relation: Other Information: PBD: 10 Sep 1997
• Country of Publication: United States
• Language: English

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