NESC0716 SPRAY3

1. NAME OR DESIGNATION OF PROGRAM:  SPRAY3

3. DESCRIPTION OF PROBLEM OR FUNCTION

SPRAY3      performs      the
calculations  of  thermodynamics,  heat  and  mass  transfer,  and
combustion of sodium spray droplets released in an LMFBR cell as a
result of  postulated piping  failure.  Droplet  motion and  large
sodium  surface area  combine to  produce rapid  heat release  and
pressure rise within the enclosed volume.

4. METHOD OF SOLUTION

The   calculation    method   utilizes    gas
convection,  heat  transfer,  and  droplet  combustion  theory  to
compute the pressure and temperature effects within the enclosure.
Nodal temperature  solutions are obtained from  instantaneous heat
and mass balances by the explicit forward-difference method.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Present
verification of the code against  experimental evidence limits the
droplet size  range to 0.01-0.30  inch with  oxygen concentrations
ranging from  0 to  21 percent.   The number  of space  increments
should be in the range of 1 to 50 for stability and accuracy.

6. TYPICAL RUNNING TIME

Approximately 200  seconds running  time is
required for a typical 45 second  problem with 50 space increments
and 20 seconds running time with 10 increments.

7. UNUSUAL FEATURES OF THE PROGRAM

SPRAY3  treats  short-term  heat
and mass transfer and combustion  of sodium droplets, differing in
this respect from the SOFIRE code  which treats sodium pools.  The
simplified  one-dimensional  gas  convection  model  in  the  cell
atmosphere differs from  the more exact convection  model utilized
in the SOMIX code.  SPRAY3 includes forced or free-convection heat
transfer to the cell walls, differing  from the NARX code which is
adiabatic on the gas space.

8. RELATED AND AUXILIARY PROGRAMS

The  SPRAY3 code  is an  advanced
version of  the original  SPRAY code developed  at HEDL  but never
documented for release to the Energy  Software Center and the more
recent SPRAY2 code.

10. REFERENCES

P.  R.  Shire,  SPRAY Code  User's  Report,  HEDL-TME
76-94, March 1977.
             P.  R. Shire,  A  Combustion  Model for  Hypothetical
Sodium Spray  Fire within Containment  for an LMFBR,  M.S. Thesis,
University of Washington, 1972.
             P.  R. Shire,  et al.,  A  Sodium Droplet  Combustion
Model  for Reactor  Accident  Analysis,  American Nuclear  Society
Transactions, Vol. 15, No. 2, p. 812, November 1972.
             P.  R.  Shire, Reactor  Sodium  Coolant  Hypothetical
Spray Release  for Containment  Accident Analysis:   Comparison of
Theory   with  Experiment,   American   Nuclear  Society   Topical
Conference on Fast Reactor Safety, CONF-740401-P1, 1974.

11. MACHINE REQUIREMENTS

An input device to read cards or card-image
input data  and output  devices for paper  and microfiche  copy of
digital information and micrographic for plot output are utilized.
These requirements may be easily modified.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  SCOPE 3.4.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

  Some
initially-undefined variables  require that the  memory be  set to
zero before execution.   The proprietary ISSCO DISSPLA  package is
utilized  for  SPRAY3  plotting.  Dummy  routines  (BGNPL,  CURVE,
DONEPL, ENDPL, GFR80, GRAPH, HEIGHT,  LEGEND, LINES, MESSAG, PAGE,
REALNO, TITLE) included in the package will have to be replaced by
the appropriate routines for the local environment.

15. NAME AND ESTABLISHMENT OF AUTHOR

                 P. R. Shire*
                 Hanford Engineering Development Laboratory
                 Westinghouse Hanford Company
                 P. O. Box 1970
                 Richland, Washington  99352
*Present address-EG&G Idaho, Inc.
                 P. O. Box 1625
                 Idaho Falls, Idaho  83401

File name	File description	Records
NESC0716_01.001	S. P. OUTPUT	7380
NESC0716_01.002	SOURCE (F4)	1243
NESC0716_01.003	S. P. INPUT	15