NESC0155 PTH-1.

PTH-1, Pressure and Temperature in Containment after Blowdown of H2O Coolant System

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: PTH-1.

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2. COMPUTERS

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Program name	Package id	Status	Status date
PTH-1	NESC0155/01	Tested	01-OCT-1965

Machines used:

Package ID	Orig. computer	Test computer
NESC0155/01	IBM 7094	IBM 7094

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3. NATURE OF PHYSICAL PROBLEM SOLVED

This program calculates containment shell pressure-temperature history resulting from aqueous coolant system blowdown.

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4. METHOD OF SOLUTION

The containment shell structure is represented as a group of slabs whose temperatures and thermal fluxes are found by solving difference equations which describe the slabs. The contained gas pressure and temperature are calculated by using ideal gas law relations. The slab values and the contained gas values are coupled in the solution by a forward difference method.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

There are 3 materials for each slab. The total number of slabs that can be represented is a function of the object program size and the number of nodes defining the temperature profile of each slab.

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6. TYPICAL RUNNING TIME

The running time is a function of the number of slabs, number of nodes per slab, and the frequency of print-out cycles. For example, a problem consisting of eleven slabs with approximately fifty nodes per slab, a calculation cycle of 0.01 hour (delta theta), and a print-out every fifty cycles required about six minutes of 7094 machine time to simulate a twenty-four hour period.

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7. UNUSUAL FEATURES OF THE PROGRAM

The code is divided into a number of subroutines. For example, there are two types of slab subroutines, one type representing the material inside the containment vessel and the other type representing the walls of the containment vessel.

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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS

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9. STATUS

Package ID	Status date	Status
NESC0155/01	01-OCT-1965	Tested at NEADB

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10. REFERENCES

- E.R. Mclaughlin, J.S. Busch, and W.D. Harrington:
PTH-1 Code Package IBM 7094.
Pressure-Temperature History Program, June 1964.

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11. MACHINE REQUIREMENTS: 32k memory.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0155/01	FORTRAN-II (IBM)

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: Standard IBM7094 FORTRAN II monitor.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

                 J. S. Busch, Kaiser Engineers
                 W. D. Harrington, Kaiser Engineers
                 Kaiser Industries Corporation
                 Kaiser Center
                 300 Lakeside Drive
                 Oakland, California  94604

                 E. R. Mclaughlin
                 Alexander and Associates
                 Tiburon, California

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16. MATERIAL AVAILABLE

NESC0155/01