1. NAME AND TITLE

GRACE II: Gamma Ray Kernel Integration Dose Rate and Heating CodeCylinders and Spheres.

The above code is listed in the ANL Nuclear Energy Software Center (NESC) as Reactor Code Abstract 46, and in the OECD NEA Data Bank as USCC-046. The technology is of early vintage. It is carried by RSIC because it is still used in the nuclear power industry. Newer technology is available. It was distributed by RSIC 14 times during 1964-1979.

2. CONTRIBUTOR

Atomics International, Canoga Park, California.

The code was obtained through the services of the former Argonne Code Center (now NESC), Argonne National Laboratory, Argonne, Illinois.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

GRACE II is a multigroup, multiregion, gamma-ray attenuation code which computes the total dose rate or heat generation rate from either a spherical or a cylindrical source. The source, which may be located in either the central region of the system or in a concentric shell region surrounding it, may be uniform, exponential, or have a polynomial variation in the radial direction. In the case of cylindrical geometry, it may also have a polynomial variation in the axial direction. A least squares fit is used to obtain the polynomial coefficients.

5. METHOD OF SOLUTION

The calculations are performed using buildup factors and integrating over source regions. The buildup factor is represented analytically in a double exponential form. The shield regions outside the source volume may be either semi-infinite slabs or concentric shells.

6. RESTRICTIONS OR LIMITATIONS

As many as 22 regions, 10 mesh points per region, 20 gamma-ray energy groups, 20 shield materials, and 20 material buildup factors may be included in a single calculation.

7. TYPICAL RUNNING TIME

None noted.

8. COMPUTER HARDWARE REQUIREMENTS

IBM 360/370. Three tape units on one channel are used.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is available for the IBM 360/370 software environment. Any non-standard library routines used have been included in the code package.

10. REFERENCE

D. S. Duncan and A. B. Speir, "GRACE II, An IBM 709 Program for Computing Gamma-Ray Attenuation and Heating in Cylindrical and Spherical Geometries," NAA-SR-MEMO-4649 (November 1959).

11. CONTENTS OF CODE PACKAGE

The package contains the referenced document, one (1.2MB) DOS diskette on which is written in separate files: the source card deck, a library of data, input data for a sample problem and output.

12. DATE OF ABSTRACT

January 1966; updated July 1981, February 1985.