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**1. NAME AND TITLE**

PKI: A Point Kernel Integration Code For Radiation Shielding Of Loop System

**2. CONTRIBUTOR**

Southwest Center for Reactor Engineering Research and Design, Chengdu, Sichuan, People's Republic Of China, through the NEA Data Bank, Gif-sur-Yvette Cedex, France.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; CDC Cyber 180 and 830.

**4. NATURE OF PROBLEM SOLVED**

PKI is a point kernel code for radiation shielding of a loop system.

**5. METHOD OF SOLUTION**

PKI solves the radiation shielding problem of gamma-ray transport in geometric space by the point kernel integration method. The geometry is described by using the geometric space configuration method. PKI considers right circular cylinder surface source, ring surface source, spheroidal right angle cone surface source and ellipsoidal right angle cone surface source. The surface source in general is not isotropically distributed.

The coolant volume source includes N-16 decay gamma radiation source, and fission product and corrosion product decay gamma radiation sources. The coolant volume source is isotropic.

The nuclear data library has gamma-ray linear mass attenuation coefficients from 92 elements and 8 shielding materials and 20 energy ranges. PKI uses the polynomial buildup factor as given by M. A. Capo.

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

On the CDC Cyber 830 at NEA Data Bank, the CPU time required for the sample case was 1268 seconds.

**8. COMPUTER HARDWARE REQUIREMENTS**

PKI runs on the CDC Cyber 180 and 830.

**9. COMPUTER SOFTWARE REQUIREMENTS**

The code was written in Fortran IV. On the CDC Cyber 830, the compiler used was FTN 5.1 under the NOS 2.1 operating system.

**10. REFERENCE**

Li Chunchuai, Z. Liwu, Z. Yuqin, Z. Chuanxu, Niu Xi Hua. *PKI: A Point Kernel
Integration Code For Radiation Shielding Of Loop System*, Southwest Center For
Reactor Engineering Research and Design, People's Republic Of China,( January 1988);
also IAEA1172, (December 13, 1989).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one DS/DD (360 K) 5.25 inch diskette.

**12. DATE OF ABSTRACT**

December 1990.

**KEYWORDS: ** COMPLEX GEOMETRY; GAMMA-RAY; GAMMA-RAY
SOURCE; KERNEL