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NESC0718 NATRANSIENT

NATRANSIENT, LMFBR Piping System Pressure Transients, Fluid Hammer, Na H2O Reaction

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1. NAME OR DESIGNATION OF PROGRAM:  NATRANSIENT
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2. COMPUTERS
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Program name Package id Status Status date
NATRANSIENT NESC0718/01 Tested 01-APR-1979

Machines used:

Package ID Orig. computer Test computer
NESC0718/01 IBM 360 series IBM 360 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

NATRANSIENT analyzes   short-
term  pressure-pulse  transients  in  a  closed  hydraulic  system
consisting of series or parallel  piping, pipe junctions, diameter
discontinuities, junctions of three to  six branches, closed ends,
surge  tanks,  far  ends,   dummy  junctions,  acoustic  impedance
discontinuities, and rupture disks.  The  working fluid is assumed
to be liquid sodium without cavitation.  The source pressure pulse
is assumed to be generated by a sodium-water reaction according to
the dynamic model of Zaker and Salmon.
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4. METHOD OF SOLUTION

The governing partial  differential equations
for  one-dimensional  unsteady  flows  are reduced  to  a  set  of
ordinary differential equations by  the method of characteristics.
The  governing   equations  include  the   complete  Navier-Stokes
equation in  which the  viscous term  is written  in terms  of the
Darcy-Weisbach friction  factor.  By  appropriate matching  of the
boundary conditions  at the  pipe junctions,  the flow  conditions
following a sodium-water reaction can be determined for the entire
network.    The   resulting  characteristics   and   compatibility
conditions are  reduced to finite  difference equations  which are
solved by stepwise numerical integration.
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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 surge tanks
   Cavitation is assumed to be absent.  To specify a working fluid
other than sodium, the source program must be changed.
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6. TYPICAL RUNNING TIME

Execution  of  the  48-leg  sample  problem
requires about 4 seconds of CPU time on the IBM370/195.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

NATRANSIENT  is  included   as  a
subroutine in  the NATRAN2 program  (NESC Abstract  719).  Related
codes are WHAM6 (NESC Abstract  278), COMPARE (NESC Abstract 702),
HAMOC (NESC Abstract 710), and NAHAMMER (NESC Abstract 717).
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9. STATUS
Package ID Status date Status
NESC0718/01 01-APR-1979 Tested at NEADB
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10. REFERENCES

Yong  Woo Shin,  The  Method  of Characteristics  for
Analysis  of  Pressure  Transients   Resulting  from  Sodium-Water
Reaction  in Hydraulic  Networks, ANL-8049  with Errata,  December
1973.
             T. A. Zaker and M. A. Salmon, Effects of Tube Rupture
in  Sodium   Heated  Steam   Generator  Units,   ASME  Publication
69-WA/NE-18, November 1969.
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11. MACHINE REQUIREMENTS:  166K bytes of storage are required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0718/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360,370.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

                 Y. W. Shin
                 Components Technology Division
                 Argonne National Laboratory
                 9700 South Cass Avenue
                 Argonne, Illinois  60439
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16. MATERIAL AVAILABLE
NESC0718/01
File name File description Records
NESC0718_01.001 SOURCE PROGRAM (F4,EBCDIC) 757
NESC0718_01.002 SAMPLE PROBLEM INPUT DATA 107
NESC0718_01.003 SAMPLE PROBLEM PRINTED OUTPUT 360
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: liquid metals, one-dimensional, pressure, reactor safety, transients.