RSICC CODE PACKAGE PSR-439

1. NAME AND TITLE

ORINC: Code System for 1-D Implicit Heat Conduction Solution.

2. CONTRIBUTORS

Oak Ridge National Laboratory, Oak Ridge, Tennessee, through the Energy Science and Technology Software Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360 (P00439I036000).

4. NATURE OF PROBLEM SOLVED

ORINC is an inverse computer program which solves a one-dimensional, transient, lumped-parameter, implicit formulation of the conduction equation to determine both the transient surface temperature and the transient surface heat flux of electrically heated rods during a simulated loss-of-coolant accident. The program was developed specifically for analysis of the Thermal-Hydraulic Test Facility Blowdown Heat Transfer (THTF-BDHT) test data as part of the overall light-water-reactor (LWR) safety research program. The THTF was a large nonnuclear experimental loop with a test section that contains a 7 x 7 array of 12-ft stepped, chopped-cosine heater rods with an outside diameter of 0.422 in.

5. METHOD OF SOLUTION

The inverse model developed specifically for the THTF heaters is subdivided into ten sections each representing a particular mathematical model of heat transfer for a specific location and heat flow rate. In each section a different combination of assumptions applicable to heat flow between nodes, nodal mass, heat capacity, thermal conductivity, and presence of gaps is made. A linear gap model is used.

6. RESTRICTIONS OR LIMITATIONS

Since ORINC cannot calculate the local heat transfer coefficient and fluid properties during the blowdown transient, it is necessary that it be coupled or interfaced with a thermal-hydraulics code which calculates these properties and the local fluid bulk temperature (or local saturation temperature).

7. TYPICAL RUNNING TIME

Not noted.

8. COMPUTER HARDWARE REQUIREMENTS

ORINC was developed on IBM 360/91 and 360/195 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required to run ORINC which was developed on the IBM MVS operating system. ORINC was developed in the 1970's. No changes were made to the package when it was transferred to RSICC and re-released in 2001.

10. REFERENCE

L. J. Ott and R. A. Hedrick, "ORINC - A One-Dimensional Implicit Approach to the Inverse Heat Conduction Problem," ORNL/NUREG-23 (November 1977).

11. CONTENTS OF CODE PACKAGE

Included in the package are the referenced document and a 3.5" DOS formatted diskette which includes the source code and JCL. No executables or test cases are provided with this package.

12. DATE OF ABSTRACT

May 2001.

KEYWORDS: LOCA; THERMAL HYDRAULICS