SNAP/RADTRAD Release Notes

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  • With the changes to the X/Q implementation in Rev. 1 of RG 1.183, users expressed interest in adding a X/Q option that used the worst two-hour dose times for the EAB to base the X/Q values on rather than each individual dose locations worst two-hour dose time. This option was added to the X/Q tables as REV1_EAB...
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  • A bug with how the DF calculated in phase one of the Regulatory Guide 1.183 Rev. 1 FHA model was implemented was found. The DF was still being used as an overall DF instead of only applying to elemental iodine. The DF was corrected and now only applies to the fraction of iodine that is elemental. The DF for aerosol iodine (CsI) is infinite (meaning all CsI is dissolved into the pool), and the DF for organic iodine is set to 1 (meaning no organic iodine is dissolved into the pool)...
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  • A new model parameter was added to the input files to specify if the inputs should follow the regulatory guide revision 0 or revision 1 guidelines. The –REV command line option was also added to specify the model parameter. The default option when none is specified is REV1. To select a particular revision, include –REV # (note the space between REV and the #) where # is 0 or 1...
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  • A bug was discovered that made it so that the activity of daughter products was not being counted when the nuclides in the initial inventory decayed. The decay process in RADTRAD would still remove and add activity from parent and daughter nuclides, but only if they were in the initial inventory. The fix allows RADTRAD to automatically add daughters to the inventory. To prevent the inventories and output files from becoming excessively large, only the first daughter in each decay chain is automatically added to the inventory. Nuclides can be added to the inventory with an initial activity of 0 if the user is interested in seeing the contribution of adding in a specific daughter...
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  • A bug was discovered that causes RADTRAD to fail when run with SNAP version 3.1.2 if the “Adaptive” or “Default with Error Calculation” options are selected for the “Time Step Algorithm” parameter. This bug is resolved in Version 5.0.2. Note that versions of RADTRAD older than 5.0.2 may fail if run with newer versions of SNAP (3.1.2 and later) if these time stepping options are enabled...
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  • An error in the implementation of the L∞ (local) error norm was fixed, making this a suitable error norm to use in addition to the L2 (global) norm. The L∞ norm determines the nuclide with the largest error and minimizes this error. This minimizes error, even for nuclides that have negligible impact. The L2 norm calculates a root mean square error for dose which is then minimized. The practical result is that the L2 norm minimizes the error of those nuclides which contribute the most to dose...
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  • RADTRAD 4.x was converted from Fortran to java. While java is a modern language, many of the paradigms of Fortran were maintained in the code. RADTRAD 5.0.0 involved significant changes to modernize the structure of the code, remove limitations, and make the code more maintainable...
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  • The maximum number of sources allowed in a model is 10. However an error would occur if more than 5 sources were included in a model because a maximum of 5 release fraction and timing tables was allowed. The maximum number of release fraction timing table was increased to be equal to the number of sources allowed...
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  • The interim “skin dose” value that was printed to the NRC output file was the deposition skin dose. The deposition velocity used in the code is zero and thus the interim skin dose was zero. However in the final “skin dose” result, cloudshine skin dose was printed. This value is nonzero. For consistency, the interim value that is printed is now cloudshine skin dose...
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  • Added the option for user to select an adaptive time step algorithm which dynamically adjusts time step size in order to keep the estimated solution error within a user specified limit. Estimated solution error is included as a plot variable...
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See RADTRAD Plug-in Change Log website for change log information.
See SNAP Core Change Log website for change log information.