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NESC0780 NALAP

NALAP, Thermohydraulics for Na Cooled LMFBR after Pipe Rupture and Accidents

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1. NAME OR DESIGNATION OF PROGRAM:  NALAP
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2. COMPUTERS
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Program name Package id Status Status date
NALAP NESC0780/01 Tested 24-FEB-1981

Machines used:

Package ID Orig. computer Test computer
NESC0780/01 CDC 7600 CDC 7600
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3. DESCRIPTION OF PROBLEM OR FUNCTION

NALAP  is  an   LMFBR  system
transient code.  This  code, adapted from the  light water reactor
transient  code RELAP3B,  simulates  thermalhydraulic response  of
sodium-cooled fast  breeder reactors when subjected  to postulated
accidents such  as a massive  pipe break as  well as a  variety of
other upset conditions that do not disrupt the system geometry.
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4. METHOD OF SOLUTION

Various   components   of   the   plant   are
represented  by  control  volumes.    These  control  volumes  are
connected  by  junctions,  some  of which  may  be  leak  or  fill
junctions.  The fluid flow equations  are modeled as compressible,
single-stream  flow with  momentum  flux  in one  dimension.   The
transient response  is   computed  by  integrating   the  thermal-
hydraulic conservation  equations from  user-initialized operating
conditions by  an implicit  numerical scheme.   The point-kinetics
approximation  is  used  to   represent  the  time-dependent  heat
generation in the reactor core.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   40 control volumes
   50 connecting junctions
    6 thermal properties
   25 pressures
   13 liquid temperatures per pressure
    6 gas temperatures per pressure
Pressure table values  must be greater than zero and  less than or
equal  to  7000 psia.   The  pressure  table restrictions  may  be
altered by modifying DIMENSION statements.
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6. TYPICAL RUNNING TIME

A  27-volume,   32-junction  problem   took
approximately  32   milliseconds  per  time-step  on   a  CDC7600.
Typically, the  time-step for a  double-ended pipe break  case was
0.05  millisecond near  the break  time.   Beyond 0.3  millisecond
after the break,  the time-step was increased  to 0.5 millisecond.
The  four sample  problems  were executed  in 6  CP  minutes on  a
CDC7600.
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7. UNUSUAL FEATURES OF THE PROGRAM

NALAP   allows    some   volumes
(typically in a  secondary and/or tertiary loop)  to contain water
or steam.  In  fact, all volumes may contain water,  in which case
NALAP can be used as RELAP3B.
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8. RELATED AND AUXILIARY PROGRAMS

Predecessors to this  program are
the INEL  RELAP editions, RELAP2  and RELAP3 (NESC  Abstract 369),
and RELAP3B (NEC Abstract 733).
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9. STATUS
Package ID Status date Status
NESC0780/01 24-FEB-1981 Tested at NEADB
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10. REFERENCES

B. A.  Martin, A. K. Agrawal,  D. C. Albright,  L. G.
Epel, and  G. Maise,  NALAP An  LMFBR System  Transient Code,  BNL
50457, July 1975.
             K. V. Moore  and W. H. Rettig, A  Digital Program for
Reactor Blowdown  and Power  Excursion Analysis,  IDO-17263, March
1968.
             W. H. Rettig, G. A. Jayne, K. V. Moore, C. E. Slater,
and M. L. Uptmor, RELAP3--A  Computer Program for Reactor Blowdown
Analysis, IN-1321, June 1970.
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11. MACHINE REQUIREMENTS

CDC7600 (or  CYBER76) with  142,000 (octal)
words of memory.  In addition to  card input and printer output, a
FORTRAN logical  unit 1  may be used  for the  automatic time-step
option,  and units  2, 3,  and 4  may  be used  under the  restart
option.  These units may be assigned to disk or tape.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0780/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  SCOPE 2.1.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

   The
following non-ANSI language extensions were used:
   OVERLAY statements and calls.
   ENCODE and DECODE statements to prepare output page headings.
   PROGRAM statements to specify file assignments.
Non-ANSI system routines called:
   EOF--returns nonzero value when end-of-file reached.
   REMARK--places message on DAYFILE.
   DATE--returns calendar date in the form mm/dd/yy.
   TIME--returns time of day in the form hh.mm.ss.
   SECOND--returns CP time used.
   SHIFT--performs a left or right binary shift.
If all  of these  are replaced  by dummy  routines, only  the page
headings are affected.   A COMPASS routine named  WHEN is included
which  may be  removed  for  non-7600 environments.   For  restart
problems, the data is read from TAPE3 and is written to TAPE4.
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 B. A. Martin, A. K. Agrawal*, D. C. Albright,
                 L. G. Epel, and G. Maise
                 Department of Applied Sciences
                 Brookhaven National Laboratory
                 Upton, New York  11973
* Contact
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16. MATERIAL AVAILABLE
NESC0780/01
File name File description Records
NESC0780_01.001 SOURCE PROGRAM 23504
NESC0780_01.002 INPUT CASE 1 239
NESC0780_01.003 INPUT CASE 2 199
NESC0780_01.004 OUTPUT CASE 1 1787
NESC0780_01.005 OUTPUT CASE 2 1609
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: LMFBR reactors, accidents, design basis accidents, fluid flow, heat transfer, hydraulics, kinetics, pipes, reactor cooling systems, ruptures, transients.