NEA-1671 DUCT-III.

DUCT-III.

Penetrations such as an entrance, supply / exhaust ducts and pipes go through walls in nuclear facilities. They are generally made as bent structures in order to decrease leakage radiation (streaming) through them. However it is very difficult to evaluate the streaming radiation because the structures are complex. The DUCT code calculates duct-streaming radiation of neutrons and photons with a semi-empirical formula, was developed in 1988 for the purpose of penetration designs. This code can treat the main types of penetrations i.e., cylindrical duct, rectangular duct, annulus and slit. This code is applicable to designs of penetrations in nuclear power plants, fusion reactor facilities, accelerator facilities, and so on, because albedo data for gamma-rays up to 10 MeV and neutrons up to 3 GeV are implemented in it. Since then, this code has been updated by simplification of input data, addition of functions to deal with bent ducts, and so on, and the DUCT-II code was developed. In 1998 -2001, the DUCT-III code was developed by adding the following functions to the DUCT-II code to allow application to high energy accelerator facilities, further simplification of input data, and so on.

1. Addition of high-energy neutron albedo data (maximum energy 3GeV)

2. Addition of a function to calculate wall scattered radiation

3. Addition of typical source spectra

4. Addition of a point kernel program PKN-H

5. Optional setup of source position

6. Development of a Visual Basic version

DUCT-III is a simple design code to calculate duct-streaming radiation in nuclear facilities by using a semi-empirical formula based on an albedo analytical method.

• K. Shin, Semiempirical Formula for Energy-Space Distributions of Streamed Neutrons and Gamma-Rays in Cylindrical Duct, Journal of Nuclear Science and Technology, 25 [1], pp. 8 - 18 (1988).

• K. Shin, An Approximate Formula for Neutron and Gamma-Ray Streaming through Ducts and Slits, 7th International Conference on Radiation Shielding, Bournemouth, UK, Sep. 12 - 16 (1988).

• K. Shin and A. Itoh, A Simple Calculation Method for 14 MeV Gap Streaming, International Symposium on Fusion Nuclear Technology, Tokyo, April 11-14 (1988).

• K. Hayashi et al., DUCT-II and SHINE-II: Simple Design Code for Duct-streaming and Skyshine, JAERI-M 91-013 (1991).

There are two versions of this code, the UNIX version runs on workstations and the Visual Basic version runs on Microsoft Excel 97*. The code package contains the Fortran source (or PC executable), data libraries, sample input and output data.

Responsible:

Toshiya Sanami, Director

Radiaction Science Center

KEK

Inter-University Research Institute Corporation

High Energy Accelerator Research Organization

1-1 Oho, Tsukuba, Ibaraki 305-0801 Japan

Developer:

Hideo HIRAYAMA

KEK

High Energy Accelerator Research Organization, Radiation Science Center

1-1 Oho, Tsukuba-shi, Ibaraki, 305-0801 Japan

Ryuichi TAYAMA, Hideo NAKANO, Hiroyuki HANDA, Katsumi HAYASHI

Hitachi Engineering Co., Ltd.

3-2-1 Saiwai-cho, Hitachi

IBARAKI 317-0073, Japan

Kazuo SHIN

Dept. of Nuclear Engineering

Kyoto University

Yoshida, Sakyo-ku

Kyoto 606-8501, Japan

Fumihiro MASUKAWA, Hiroshi NAKASHIMA, Nobuo SASAMOTO

JAEA

Tokai-mura, Naka-gun

IBARAKI 319-1195, Japan