NESC0717 NAHAMMER
NAHAMMER, Pressure Transients in Na LMFBR Piping System, Linear Fluid Hammer Theory
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 AUTHORS, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| NAHAMMER | NESC0717/01 | Tested | 01-APR-1979 |
| NAHAMMER | NESC0717/02 | Tested | 01-JUL-1978 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NESC0717/01 | IBM 360 series | IBM 360 series |
| NESC0717/02 | CDC 7600 | CDC 7600 |
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3. DESCRIPTION OF PROBLEM OR FUNCTION
NAHAMMER analyzes short-term pressure-pulse transients in a closed hydraulic system consisting of series or parallel piping, pipe junctions, diameter discontinuities, elbows, junctions of three to six branches, orifices, accoustic- impedance discontinuities, dummy junctions, dead ends, and free surfaces in surge tanks. The working fluid is assumed to be sodium without cavitation.
NAHAMMER analyzes short-term pressure-pulse transients in a closed hydraulic system consisting of series or parallel piping, pipe junctions, diameter discontinuities, elbows, junctions of three to six branches, orifices, accoustic- impedance discontinuities, dummy junctions, dead ends, and free surfaces in surge tanks. The working fluid is assumed to be sodium without cavitation.
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4. METHOD OF SOLUTION
NAHAMMER considers a simplified one-dimensional linear inviscid set of governing equations. Classical fluid-hammer theory was linearized by neglecting the viscosity and recognizing that convective terms are negligible when the ratio of flow velocity to sonic speed is less than 0.01. Numericalsolutions are obtained by a simple superposition technique for tracing the waves traveling along each characteristic and for extending the solution from one constant time line to the next.
NAHAMMER considers a simplified one-dimensional linear inviscid set of governing equations. Classical fluid-hammer theory was linearized by neglecting the viscosity and recognizing that convective terms are negligible when the ratio of flow velocity to sonic speed is less than 0.01. Numericalsolutions are obtained by a simple superposition technique for tracing the waves traveling along each characteristic and for extending the solution from one constant time line to the next.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
The program currently provides for maxima of:
50 legs
120 nodes per leg
50 junctions
10 plenums (surge tanks)
The assumption of linearity restricts the maximum pressure at any propagating wave front in sodium to about 5800 psi. Calculations are limited to liquid sodium in the absence of cavitation. Friction- free fluid motion maintains its energy within any pipe section, but conventional energy losses based on steady-state incompressible fluid flow are taken into account for elbows, diameter discontinuities, and orifice-like restrictions. To specify a working fluid other than sodium, the source coding must be changed.
The program currently provides for maxima of:
50 legs
120 nodes per leg
50 junctions
10 plenums (surge tanks)
The assumption of linearity restricts the maximum pressure at any propagating wave front in sodium to about 5800 psi. Calculations are limited to liquid sodium in the absence of cavitation. Friction- free fluid motion maintains its energy within any pipe section, but conventional energy losses based on steady-state incompressible fluid flow are taken into account for elbows, diameter discontinuities, and orifice-like restrictions. To specify a working fluid other than sodium, the source coding must be changed.
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7. UNUSUAL FEATURES OF THE PROGRAM
In NAHAMMER the initial transient is followed by a pressure pulse from a molten-fuel coolant interaction (MFCI) that produces a local pressure generation in the fuel (heat-producing) region of the system. At the user's option, the pressure-time history during the MFCI either is calculated in subroutine DIFFUN according to an ANL rate-limited parametric model or is input. The source region is a special region through which the waves are not allowed to travel.
In NAHAMMER the initial transient is followed by a pressure pulse from a molten-fuel coolant interaction (MFCI) that produces a local pressure generation in the fuel (heat-producing) region of the system. At the user's option, the pressure-time history during the MFCI either is calculated in subroutine DIFFUN according to an ANL rate-limited parametric model or is input. The source region is a special region through which the waves are not allowed to travel.
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| Package ID | Status date | Status |
|---|---|---|
| NESC0717/01 | 01-APR-1979 | Tested at NEADB |
| NESC0717/02 | 01-JUL-1978 | Tested at NEADB |
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NESC0717/01, included references:
W. L. Chen, D. H. Thompson, and Y. W. Shin:A Computer Program for Analysis of One-dimensional Pressure-pulse
Propagation in a Closed Fluid System, ANL-8059, May 1974
NESC0717/02, included references:
W. L. Chen, D. H. Thompson, and Y. W. Shin:A Computer Program for Analysis of One-dimensional Pressure-pulse
Propagation in a Closed Fluid System, ANL-8059, May 1974
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| Package ID | Computer language |
|---|---|
| NESC0717/01 | FORTRAN-IV |
| NESC0717/02 | FORTRAN-IV |
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15. NAME AND ESTABLISHMENT OF AUTHORS
360 W. L. Chen and D. H. Thompson
Reactor Analysis and Safety Division
Y. W. Shin
Components Technology Division
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
7600 H. S. Edwards
National Energy Software Center
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
360 W. L. Chen and D. H. Thompson
Reactor Analysis and Safety Division
Y. W. Shin
Components Technology Division
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
7600 H. S. Edwards
National Energy Software Center
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
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NESC0717/01
| File name | File description | Records |
|---|---|---|
| NESC0717_01.001 | SOURCE PROGRAM (F4,EBCDIC) | 1013 |
| NESC0717_01.002 | SAMPLE PROBLEM INPUT DATA | 75 |
| NESC0717_01.003 | SAMPLE PROBLEM PRINTED OUTPUT | 1691 |
NESC0717/02
| File name | File description | Records |
|---|---|---|
| NESC0717_02.001 | INFORMATION | 3 |
| NESC0717_02.002 | SOURCE PROGRAM (F4) | 904 |
| NESC0717_02.003 | SAMPLE PROBLEM INPUT DATA | 75 |
| NESC0717_02.004 | SAMPLE PROBLEM PRINTED OUTPUT | 1691 |
Keywords: LMFBR reactors, liquid metals, one-dimensional, pressure, reactor safety, transients.