1. NAME AND TITLE

CAPS-2: Analysis of Structures for Fallout Radiation Shielding.

AUXILIARY ROUTINE

PREPARE: Data Generator.

The CAPS-2 code is one of a series of CAPS (Computer Analysis for Protective Structures) developed by the former Office of Civil Defense (OCD). Originally developed by the firm of Praeger-Kavanaugh-Waterbury, extensive modification has been made to the code by OCD.

This code package is retained by RSIC to preserve the technology developed in the 1960s.

2. CONTRIBUTOR

Office of Civil Defense, Office of the Secretary of the Army, Department of the Army, Washington, D. C.

3. CODING LANGUAGE AND COMPUTER

FORTRAN 63; CDC-1604.

4. NATURE OF PROBLEM SOLVED

CAPS-2 was designed to analyze structures for fallout radiation shielding by computing protection factors and for studying the sensitivity of results to varying shielding parameters or other basic input data.

5. METHOD OF SOLUTION

The code represents the mechanization of what has come to be called the "Engineering Manual Method" of shelter design and fallout shielding analysis. The method is based largely on the data and analysis described by Spencer and prescribed in detail in a number of OCD publications by Eisenhauer and Fitz-Simons (see references). Most of the basic data used are results of moments method calculations. The analysis takes the form of determining and combining barrier attenuation factors, geometry factors (in which are incorporated integrations over angular distributions), albedo factors, and other modifying factors.

6. RESTRICTIONS OR LIMITATIONS

There are no known restrictions or limitations.

7. TYPICAL RUNNING TIME

The code will process a variety of structures (with up to 10 detector points on any designated story) at an average speed of less than a second per shelter area on the CDC-3600.

Estimated running time for the sample problems on the CDC 1604A: PREPARE, 30 seconds; COMPRAD 1, 40 seconds, and COMPRAD 2, 1 minute, 3 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

The code was designed for the CDC 3600 and is also operable on the CDC 1604 with 3 tape units.

9. COMPUTER SOFTWARE REQUIREMENTS

The code may be compiled and executed on the FORTRAN 63 COOP Monitor or other compatible system. Tape assignments are made for input, output, system and one pool tape for a library.

10. REFERENCES

a. Included in package:

J. L. Dirst, "CAPS-2 - A Computerized Method of Analyzing Structures for Radiation Shielding," OCD-JD1 (January 1966).

b. Background information:

OCD Publication, "Shelter Design and Analysis Vol.1, Fallout Protection," TR-20 (Vol.1) (May 1964).

L. V. Spencer, "Structure Shielding Against Fallout Radiation from Nuclear Weapons," NBS Monograph 42 (1962).

OCD Publication, "Design and Review of Structures for Protection from Fallout Gamma Radiation," PM 100-1 (February 1965).

C. Eisenhauer, "Design and Review of Structures for Protection from Fallout Gamma Radiation," PM 100-1 Supplement (1964).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents (10.a) and one (1.2MB) DOS diskette which contains the source codes and input data for two sample problems.

12. DATE OF ABSTRACT

January 1968; updated July 1981.

KEYWORDS: CIVIL DEFENSE; FALLOUT; ENGINEERING MANUAL METHOD