RSICC CODE PACKAGE CCC-507

1. NAME AND TITLE

SPEEDI: Code System for Real-Time Prediction of Radiation Dose to the Public Due to an Accidental Release from a Nuclear Power Plant.

2. CONTRIBUTOR

Japan Atomic Energy Research Institute, Tokai-mura, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; FACOM M-380 (C00507FM18000).

4. NATURE OF PROBLEM SOLVED

The suite of computer codes, SPEEDI, predicts the dose to the public from a plume released from a nuclear power plant. The main codes comprising SPEEDI are: WIND04, PRWDA, and CIDE. WIND04 calculates three-dimensional mass-conservative windfields. PRWDA calculates concentration distributions, and CIDE estimates the external and internal doses. These models can take into account the spatial and temporal variation of wind, variable topography, deposition and variable source intensity for use in real-time assessment. We recommend that you also review the emergency response supporting system CCC-661/ EXPRESS documentation.

5. METHOD OF SOLUTION

WIND04 uses a three-dimensional mass-consistent model to calculate windfields in complex terrain. By using windfields generated by WIND04, the PRWDA code, which employs a random-walk method to simulate a gradient-transfer theory numerically, predicts the spatial and temporal airborne concenetration. The CIDE code uses a cell-integrated dose model to calculate the external gamma dose from a randomly distributed radioactive cloud.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

On a FACOM VP-100, the WIND04 sample problem ran in 6 seconds. The PRWDA rpoblem required 36 seconds, and the CIDE problem ran in 9 seconds of CPU time.

8. COMPUTER HARDWARE REQUIREMENTS

The software runs on FACOM M-380 and VP-100.

9. COMPUTER SOFTWARE REQUIREMENTS

The FACOM Fortran77/VP compiler was used under the OSIV/F4 MSP E20 V10L20 operating system. PRWDA uses the JAERI subroutine library to generate random numbers.

10. REFERENCES

M. Chino, H. Ishikawa and M. Kai, "Manual of a Suite of Computer Codes, SPEEDI."

K. Imai, M. Chino, H. Ishikawa, M. Kai et al., "SPEEDI: A Computer Code System for the Real-Time Prediction of Radiation Dose to the Public Due to an Accidental Release," JAERI 1297 (October 1985).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents in 10.a and a DS/HD diskette with the source codes and sample problem input and output written in a self-extracting compressed DOS file.

12. DATE OF ABSTRACT

November 2000.

KEYWORDS: AIRBORNE; INTERNAL DOSE; NUCLIDE TRANSPORT; REACTOR SAFETY; REACTOR ACCIDENT