**1. NAME AND TITLE**

RACER: Calculation of Potential External Dose from Airborne Fission Products Following Postulated Reactor Accident.

**AUXILIARY ROUTINE**

RIBD: Radioisotope Buildup and Decay Data Generator.

RIBD is available separately as CCC-137/RIBD.

**2. CONTRIBUTOR**

Battelle Memorial Institute, Pacific Northwest Laboratories, Richland, Washington.

**3. CODING LANGUAGE AND COMPUTER**

FORTRAN IV; UNIVAC 1108.

**4. NATURE OF PROBLEM SOLVED**

The program calculates whole body gamma-ray dose resulting from exposure to a plume of airborne radionuclides released from a nuclear reactor. The plume concentration is assumed to be bivariate Gaussian with perfect reflection at the ground plane. The multiple containment model is comprised of three stirred vessels in series with removal terms for settling and filtration. Resuspension of volatile daughters from settled and filtered material is also accounted for. Fission product chain decay is accounted for at all stages of the calculations. Fission product inventories are calculated by a multiple chain grid processor which allows for two fission sources (RIBD).

**5. METHOD OF SOLUTION**

A point kernel integration is used to calculate the finite cloud dose. The numerical integration technique used is an eight point polynomial approximation applied to as many intervals as necessary to ensure an accurate calculation.

**6. RESTRICTIONS OR LIMITATIONS**

Number of fission products 450

Number of activation products 150

Number of photon energy groups 16

Number of nuclides per decay chain 7

Number of decay chains 96

Number of time increments for release of nuclides to the atmosphere 354

**7. TYPICAL RUNNING TIME**

Approximately 5 minutes are required for a simple run.

**8. COMPUTER HARDWARE REQUIREMENTS**

The code is operable on the UNIVAC 1108 computer.

**9. COMPUTER SOFTWARE REQUIREMENTS**

The code requires a FORTRAN V compiler. Three types of data libraries are used and are included in the package.

**10. REFERENCE**

D. L. Strenge, M. M. Hendrickson, E. C. Watson, "RACERA Computer Program for Calculating Potential External Dose from Airborne Fission Products Following Postulated Reactor Accidents," BNWL-B-69 (June 1971).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (1.2MB) DOS diskette which contains data libraries, source program and sample problem input.

**12. DATE OF ABSTRACT**

February 1975.

**KEYWORDS: ** AIRBORNE; FISSION PRODUCTS; REACTOR ACCIDENT