NEA-0631 CLAPTRAP.
CLAPTRAP, Pressure Transients in LWR Containment During LOCA
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM 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 AUTHOR, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| CLAPTRAP | NEA-0631/01 | Tested | 01-MAY-1980 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-0631/01 | IBM 3033 | IBM 3033 |
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3. DESCRIPTION OF PROBLEM OR FUNCTION
CLAPTRAP calculates pressure transients in total containments enclosing a breached water reactor circuit. It allows for:
- The influx of steam-water mass and enthalpy from a breach (alternatively as an option the primary circuit details can be entered in which case the code will calculate the breach flow and enthalpy).
- The heat transfer to complex wall and plant structures.
- The outleakage.
- Either complete equilibrium between phases or water disposition without equilibration.
CLAPTRAP calculates pressure transients in total containments enclosing a breached water reactor circuit. It allows for:
- The influx of steam-water mass and enthalpy from a breach (alternatively as an option the primary circuit details can be entered in which case the code will calculate the breach flow and enthalpy).
- The heat transfer to complex wall and plant structures.
- The outleakage.
- Either complete equilibrium between phases or water disposition without equilibration.
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4. METHOD OF SOLUTION
A finite difference method is used to solve the heat diffusion equation in both slab geometry (a sandwich assembly of materials) and cylindrical geometry (heat diffusion from fuel pins). The isentropic flow conditions are found using the well- known isentropic critical throat pressure relationship. The pressure and quality of a two-phase mixture of steam-water and air is determined iteratively using also a finite difference method. The code has provision for the additional heat supplied by the zirconium/water reaction but not for secondary hydrogen burning.
A finite difference method is used to solve the heat diffusion equation in both slab geometry (a sandwich assembly of materials) and cylindrical geometry (heat diffusion from fuel pins). The isentropic flow conditions are found using the well- known isentropic critical throat pressure relationship. The pressure and quality of a two-phase mixture of steam-water and air is determined iteratively using also a finite difference method. The code has provision for the additional heat supplied by the zirconium/water reaction but not for secondary hydrogen burning.
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8. RELATED AND AUXILIARY PROGRAMS
CLAPTRAP II calculates pressure transients in the interconnected compartments of a total containment enclosing a breached water reactor circuit.
The most important subroutine in CLAPTRAP, CNTN 1, which analyses the pressure transient in a containment containing air with water vapour initially present at a known dewpoint, may be attached to any code which analyses the transient conditions in a breached water circuit, such as RELAP and STEWPOT. STEWPOT enables estimates to be made of the primary circuit depressurisation characteristics on a loss-of-coolant accident.
CLAPTRAP II calculates pressure transients in the interconnected compartments of a total containment enclosing a breached water reactor circuit.
The most important subroutine in CLAPTRAP, CNTN 1, which analyses the pressure transient in a containment containing air with water vapour initially present at a known dewpoint, may be attached to any code which analyses the transient conditions in a breached water circuit, such as RELAP and STEWPOT. STEWPOT enables estimates to be made of the primary circuit depressurisation characteristics on a loss-of-coolant accident.
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10. REFERENCES
- W. Rettig et al.:
"RELAP-3 - A Computer Programme for Reactor Blowdown Analysis"
IN-1321.
- W.H.L. Porter:
"STEWPOT - A Code for Establishing Conditions in the Primary
Circuit on Depressurising a Water Reactor"
AEEW-M1099.
- W. Rettig et al.:
"RELAP-3 - A Computer Programme for Reactor Blowdown Analysis"
IN-1321.
- W.H.L. Porter:
"STEWPOT - A Code for Establishing Conditions in the Primary
Circuit on Depressurising a Water Reactor"
AEEW-M1099.
NEA-0631/01, included references:
- W.H.L. Porter:"CLAPTRAP - A Code for Calculating Pressure Transients in Total
Containments Enclosing a Breached Water Reactor Circuit"
AEEW - R965 (1977).
- W.H.L. Porter:
"CLAPTRAP II - A Code for Calculating Pressure Transients in the
Interconnected Compartments of a Total Containment Enclosing a
Breached Water Reactor Circuit"
AEEW-R1108 (1977).
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NEA-0631/01
| File name | File description | Records |
|---|---|---|
| NEA0631_01.001 | INFORMATION FILE | 5 |
| NEA0631_01.002 | SOURCE | 2017 |
| NEA0631_01.003 | S.P. INPUT | 40 |
| NEA0631_01.004 | S.P. OUTPUT | 6743 |
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- G. Radiological Safety, Hazard and Accident Analysis
- H. Heat Transfer and Fluid Flow
Keywords: containment systems, coolant loops, cylinders, diffusion equations, enthalpy, finite difference method, heat transfer, loss-of-coolant accident, mass transfer, pressure, slabs, steam, transients, water, water cooled reactors.