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Title: DRSPALL: Impact of the Modification of the Numerical Spallings Model on Waste Isolation Pilot Plant Performance Assessment.

The numerical code DRSPALL (from direct release spallings) is written to calculate the volume of Waste Isolation Pilot Plant (WIPP) solid waste subject to material failure and transport to the surface as a result of a hypothetical future inadvertent drilling intrusion. An error in the implementation of the DRSPALL finite difference equations was discovered as documented in Software Problem Report (SPR) 13-001. The modifications to DRSPALL to correct the finite difference equations are detailed, and verification and validation testing has been completed for the modified DRSPALL code. The complementary cumulative distribution function (CCDF) of spallings releases obtained using the modified DRSPALL is higher compared to that found in previous WIPP performance assessment (PA) calculations. Compared to previous PAs, there was an increase in the number of vectors that result in a nonzero spallings volume, which generally translates to an increase in spallings releases. The overall mean CCDFs for total releases using the modified DRSPALL are virtually unchanged, thus the modification to DRSPALL did not impact WIPP PA calculation results.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3]
  1. Stoller Newport News Nuclear, Inc., Carlsbad, NM (United States)
  2. Sandia National Lab. (SNL-NM), Carlsbad, NM (United States)
  3. GRAM Inc., Albuquerque, NM (United States)
Publication Date:
OSTI Identifier:
1235212
Report Number(s):
SAND--2016-0231
618361; TRN: US1600240
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, Carlsbad, NM
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 97 MATHEMATICS AND COMPUTING; WIPP; DISTRIBUTION FUNCTIONS; VALIDATION; COMPARATIVE EVALUATIONS; MODIFICATIONS; VOLUME; PERFORMANCE; SOLID WASTES; EQUATIONS; D CODES; HUMAN INTRUSION; DRILLING; ERRORS; FAILURES; RADIONUCLIDE MIGRATION; VERIFICATION; FINITE DIFFERENCE METHOD; CORRECTIONS; MATHEMATICAL MODELS