NEA-1169 HORN.

HORN, Fission Products Transport in Primary Coolant System of BWR and PWR in LOCA

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: HORN.

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2. COMPUTERS

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Program name	Package id	Status	Status date
HORN	NEA-1169/01	Tested	15-FEB-1990

Machines used:

Package ID	Orig. computer	Test computer
NEA-1169/01	FACOM M-380	IBM 3083

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3. DESCRIPTION OF PROGRAM OR FUNCTION

HORN analyzes the transport of airbone fission products (either gaseous or aerosol) in dry primary cooling circuit during severe accidents of LWRs.

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4. METHOD OF SOLUTION

The central part of the code is a subcode for solid-gas chemical equilibrium (separately published as MPEC2). The results of this subcode, concentrations of gaseous or condensed chemical species, are used for mass transport calculation with simple empirical correlations.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM: The maximum number of control volumes is 50.

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6. TYPICAL RUNNING TIME

The running time was 24 second for a case in which the flow path was divided into eight and the number of time steps was 60 (for a phenomenon lasting for 300 s).

NEA-1169/01

The test case included in this package ran at NEADB on an IBM 3083 computer in 205 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM

The code considers the chemical forms of seven relatively volatile fission products: Cs, I, Te, Ag, Cd, Sb and Ba. Because of the fundamental assumption of instantaneous chemical equilibrium, the system must be analyzed at high temperature.

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8. RELATED AND AUXILIARY PROGRAMS

The principal subcode NEK for chemical equilibrium is published as an independent code MPEC2 (with slight modifications).

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9. STATUS

Package ID	Status date	Status
NEA-1169/01	15-FEB-1990	Tested at NEADB

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10. REFERENCES:

NEA-1169/01, included references:

- M. Uchida and H. Saito:
  HORN: A Computer Code to Analyze the Gas-Phase Transport of
  Fission Products in Reactor Cooling System Under Severe Accidents.
  JAERI-M 86-158  (November 1986)

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11. MACHINE REQUIREMENTS

None.
NEA 1169/01: To run the test case included in this package on an IBM 3083 computer, 1392K bytes of main storage are required.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-1169/01	FORTRAN-77

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The code uses in several parts a manufacturer-supplied subroutine GAUELD. GAUELD is a subroutine that solves a set of simultaneous arithmetic equations by the Gauss elimination method.

NEA-1169/01

MVS/XA (IBM 3083) with compiler VS FORTRAN Level 2.3.0.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
No particular restrictions or unusual features.

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15. NAME AND ESTABLISHMENT OF AUTHORS

          Masaaki UCHIDA
          Department of Fuel Safety Research
          Tokai Research Establishment
          Japan Atomic Energy Research Establishment
          Tokai-mura, Naka-gun, Ibaraki-ken, JAPAN

          Hiroaki SAITO
          Century Research Center Corporation

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16. MATERIAL AVAILABLE

NEA-1169/01

File name	File description	Records
NEA1169_01.001	Information file	101
NEA1169_01.002	HORN source file	6508
NEA1169_01.003	GAUELD simulation routine	143
NEA1169_01.004	Sample data	46
NEA1169_01.005	JCL used at Data Bank	15
NEA1169_01.006	Sample output by Data Bank	3976
NEA1169_01.007	Sample output by the author	1121

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17. CATEGORIES

G. Radiological Safety, Hazard and Accident Analysis

Keywords: BWR reactors, accidents, chemical reactions, coolant loops, fission products, loss-of-coolant accident, pwr reactors.