1. NAME AND TITLE

SCANS 1A: Shipping Cask Design Review Analysis.

AUXILIARY PROGRAM

NONE

2. CONTRIBUTOR

Lawrence Livermore National Laboratory, Livermore, California.

3. CODING LANGUAGE AND COMPUTER

Microsoft FORTRAN 4.01 and Microsoft Assembler 5.0.; IBM PC (P00373/PC386/01).

4. NATURE OF PROBLEM SOLVED

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 regulatory cases described in the Code of Federal Regulations (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 sheer 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.

5. 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.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. 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.

8. COMPUTER HARDWARE REQUIREMENTS

SCANS is designed for IBM PC or compatible computers. The minimum required hardware configuration is 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.

9. COMPUTER SOFTWARE REQUIREMENTS

DOS 3.1 or later. Only executables are included, no source or compiling necessary. The code system can be executed under Windows95.

10. REFERENCES

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, Rev.1 (February 1992).

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 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 Puncture of Shipping Casks," NUREG/CR-4554 (UCID-20674) Vol. 7, February 1990; SCANS, NESC No. 1119, SCANS Flexible Disk Cartridge Descriptions, National Energy Software Center Note 89-83 (August 28, 1989).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and the SCANS executables and data for one test case. The package is transmitted on one 3.5-inch high density diskette in MS-DOS format.

12. DATE OF ABSTRACT

December 1998.

KEYWORDS: SHIPPING CASK DESIGN