NESC1119 SCANS.

1. NAME OR DESIGNATION OF PROGRAM:  SCANS.

3. DESCRIPTION OF PROGRAM OR FUNCTION

SCANS (Shipping Cask ANalysis System) is a microcomputer-based system of computer programs and databases for evaluating safety analysis reports on spent fuel shipping casks. SCANS calculates the global response to impact loads, pressure loads, and thermal conditions, providing reviewers with an independent check on analyses submitted by licensees. Analysis options are based on regularoty cases described in the Code of Federal Regulation (1983) and Regulatory Guides published by the  NRC in 1977 and 1978.
The system is composed of a series of menus and input entry cask analysis, and output display programs. An analysis is performed by preparing the necessary input data and then selecting the appropriate analysis: impact, thermal (heat transfer), thermally- induced stress, or pressure-induced stress. All data are entered through input screens with descriptive data requests, and, where possible, default values are provided. Output (i.e., impact force, moment and shear time histories; impact animation; thermal/stress geometry and thermal/stress element outlines; temperature distributions as isocontours or profiles; and temperature time histories) is displayed graphically and can also be printed.

4. METHOD OF SOLUTION

Impact analyses use a one-dimensional dynamic beam model. Each node in the beam model has two translational and one rotational degrees of freedom. The impact code uses an explicit  time-history integration scheme in which equilibrium is formulated in terms of the global external forces and internal force resultants. This formulation allows the code to track large rigid- body motion. Thus, the oblique impact problem can be calculated from initial impact through essentially rigid-body rotation to secondary  impact. Lateral pressure due to lead-slump can also be calculated.
Appropriate two-dimensional finite-element meshes are automatically generated for thermal, thermal-stress, and pressure- stress analyses, based on the general geometry description. SCANS allows steady-state or transient thermal analyses, which may include phase change, time- and/or temperature-dependent material properties, time and/or temperature boundary conditions, and internal heat generation. Possible thermal boundary conditions include specified temperature, heat flux, convection, radiation, interface contact resistance, and nonlinear heat transfer to a bulk  node. Thermal analyses use 4-node elements. Stress analyses use 9-node elements. Thermal-stress and pressure-stress analyses are performed using a linear-elastic static structural analysis program  which allows temperature-dependent material properties.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME

Execution of the entire set of cask analyses  supplied using the SAMPLE spent fuel shipping cask (ID9999) required approximately 15 CP minutes on an IBM PC/AT.

The demonstration data set (spent fuel shipping cask ID 9999) was executed at NEA-DB on a PC DELL 466/L (processor 80486, 66 MHz). A few seconds are required to run any of the analyses performed (IMPACT analysis, THERMAL analysis, THERMALLY- INDUCED STRESS analysis or PRESSURE-INDUCED STRESS analysis).

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

The Cray version of IMPASC, an explicit finite-element code written to perform dynamic lumped- parameter impact analysis of shipping containers, is incorporated in SCANS. The lead slump methodology developed for SCANS is a simplified approach which can produce results comparable to those of the more sophisticated finite-element NIKE code (NESC 9923). TOPAZ (NESC 9801), a two-dimensional implicit finite-element code, is included in SCANS for heat conduction calculations. The modules used for thermal- and pressure-stress analyses are based on the proprietary SAP80 software of Computers & Structures, Inc.

10. REFERENCES

- SCANS, NESC No. 1119, SCANS Flexible Disk Cartridge Descriptions
  National Energy Software Center Note 89-83 (August 28, 1989).

- M.A. Gerhard, D.J. Trummer, G.L. Johnson, and G.C. Mok:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 1
  User's Manual to Version 1a (Including Program Reference)
  NUREG/CR-4554 (UCID-20674) Vol. 1 (February 1989).
- R.C. Chun, D.J. Trummer, and T.A. Nelson:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 2
  Theory Manual/Impact Analysis
  NUREG/CR-4554 (UCID-20674) Vol. 2 (February 1989).
- R.C. Chun, T. Lo, G.C. Mok, and M.C. Witte:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 3
  Theory Manual/Lead Slump in Impact Analysis and Verification of
  Impact Analysis
  NUREG/CR-4554 (UCID-20674) Vol. 3 (February 1989).
- G.L. Johnson and A.B. Shapiro:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 4
  Theory Manual/Thermal Analysis
  NUREG/CR-4554 (UCID-20674) Vol. 4 (February 1989).
- D.J. Trummer and M.A. Gerhard:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 5
  Theory Manual Thermal/Pressure Stress Analysis
  NUREG/CR-4554 (UCID-20674) Vol. 5 (February 1989).
- T. Lo, G.C. Mok and D.J. Chinn:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 6
  Theory Manual Thermal/Buckling of Circular Cylindrical Shells
  NUREG/CR-4554 (UCID-20674) Vol. 6 (February 1990).
- Ting-Yu Lo:
  SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review Volume 7
  Theory Manual Thermal/Puncture of Shipping Casks
  NUREG/CR-4554 (UCID-20674) Vol. 7 (February 1990).
- R.C. Chun et al.:
SCANS (Shipping Cask ANalysis System) A Microcomputer Based
  Analysis System for Shipping Cask Design Review
Volume 3, Revision 1
NUREG/CR-4554, UCID-20674 Vol.3, Rev. 1 (June 1991)
- M.H. Putnam and G.E. Putnam:
SCANS, Spectra Calculation from Activated Nuclide Sets
Mathematics and Computers TID-4500 (IN-1446) November 1970

11. MACHINE REQUIREMENTS

SCANS is designed for IBM PC or compatible computers. The minimum required hardware configuration is an IBM PC  or compatible with a 10 Mbyte fixed disk drive, a 360 Kbyte flexible disk drive, 640 Kbytes memory, a CGA board, color graphics monitor,  8087 math coprocessor, and an IBM or Epson graphics printer. Performance is improved by use of XTs, ATs, PS/2s or compatible systems including the 80386 machines with VGA board and HP LaserJet  printers.

The SAMPLE was run at NEA-DB on a 66-MHz PC/80486 with  16 MB of RAM. The total size of the 26 executables needed to run SCANS is about 1.7MB, but the biggest file does not exceed 220KB. No special memory requirements are imposed to run SCANS.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS 3.1 or later.

The sample problem was run at NEA-DB under MS-DOS V6.0.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:  The
SCANS source code is not supplied.

15. NAME AND ESTABLISHMENT OF AUTHORS

           M.A. Gerhard
           Lawrence Livermore National Laboratory

File name	File description	Records
NESC1119_01.001	SCANS Information file	218
NESC1119_01.002	Batch file for SCANS installation	35
NESC1119_01.003	Self-extracting file with the 83 SCANS files	0
NESC1119_01.004	DOS file-names	3