PSR-0277 LEPRICON.

1. NAME OR DESIGNATION OF PROGRAM:  LEPRICON.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The LEPRICON system provides state-of-the-art routines to prepare input to and process results from the discrete ordinates codes CCC-484/DORT and CCC-254/ANISN to  determine best estimates with uncertainties of group fluences in pressure vessels of pressurized water reactors. The system anticipates availability of results of dosimetry measurements performed in the reactor as well as sources operating during the time of exposure.

4. METHOD OF SOLUTION

Effects of time-dependent core source spatial distributions, when necessary, are treated by the use of an adjoint  function coupled with a scaling technique. Sources are generated by  combining the results of the diffusion theory code PDQ-7 pin-wise calculations with in-core assembly-wise instrumentation and are converted from X-Y to R-theta geometry. Fluxes calculated by the discrete ordinates codes are then synthesized to form 3-D distributions, and the resulting calculated dosimeter responses compared with the measurements, and adjustments performed in a generalized linear least-squares combination procedure. Through correlations generated from the input, adjustments to the originally calculated group fluxes at a selected point in the pressure vessel are then made, and the best estimates of the fluences accumulated during the time period analyzed are output along with their reduced  uncertainties.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Much of the input data to the adjustment routine may be defaulted to "built-in" values by proper choice of the input options. However, these values may not apply to every reactor, and a caveat must be issued that the user might have to alter some of the definitions of the flux bias factors to describe additional uncertainties peculiar to his own reactor. One may also override any default input if other values are judged more appropriate.
The ISOPLOT4 source, sample input and output files are included on tape but were not tested by RSIC. Users who wish to run ISOPLOT may request PSR-155/DOGS from RSIC to obtain source and additional I/O routines required.

6. TYPICAL RUNNING TIME

Sample problem running times vary from 1
second for FLUENS to approximately 5 minutes for the LEPRICON ADJUST module.

The different modules of this package were implemented  by NEA-DB on an IBM 3090 computer. The test runs required the following execution times (CPU): DOTSOR 6sec; DOTSYN 2sec; BCBN 8sec; TIMPATCH 3sec; FLUENS 0.3sec; LEPRICON (case 1) 1min50sec; LEPRICON (case 2) 1min45sec.

7. UNUSUAL FEATURES OF THE PROGRAM

The LEPRICON 56 group data library is essentially based on ENDF/B-IV data, except dosimetry and activation cross sections which were derived from ENDF/B-V.

8. RELATED AND AUXILIARY PROGRAMS:

DOTSOR              Neutron source distribution in LWR core
DOTSYN              Synthesizes 3-D fluxes
TIMPATCH            Evaluate time-dependent source distribution in
                    PWR surveillance dosimetry
FLUENS              Calculates weighted spectral fluences and
                    uncertainties
ELXSIR              56-group neutron cross-section library for LWR
                    pressure vessel irradiation studies

10. REFERENCES

- R.E. Maerker, B.L. Broadhead and J.J. Wagschal
  Theory of a New Unfolding Procedure in Pressurized Water Reactor
  Pressure Vessel Dosimetry and Development of an Associated Data
  Base
  Nuclear Science and Engineering 91, 369-392 (1985).
- R.E. Maerker, B.L. Broadhead, B.A. Worley, M.L. Williams and J.J.
  Wagschal
  Application of the LEPRICON Unfolding Procedure to the Arkansas
  Nuclear One-Unit 1 Reactor
  Nuclear Science and Engineering 93, 137-170 (1986).
- R.E. Maerker
  LEPRICON Analysis of Pressure Vessel Surveillance Dosimetry
  Inserted into H.B. Robinson-2 During Cycle 9
  Nuclear Science and Engineering 96, 263-289 (1987).
- R.E. Maerker, M.L. Williams and B.L. Broadhead
  Accounting for Changing Source Distributions in LWR Surveillance
  Dosimetry Analysis
  Nuclear Science and Engineering 94, 291-308 (1986).

- M.L. Williams:
  DOTSOR - A Module in the LEPRICON Computer Code System for
  Representing the Neutron Source Distribution in LWR Cores
  EPRI Research Project 1399-1, Interim Report (December 1985).
- M.L. Williams et al.:
  DOTSYN - A Module for Synthesizing Three-Dimensional Fluxes in the
  LEPRICON Computer Code System
- R.E. Maerker et al.:
  TIMPATCH - A MODULE in the LEPRICON Computer Code System for
  Evaluating Effects of Time-Dependent Source Distributions in PWR
  Surveillance Dosimetry
  EPRI Research Project 1399-1, Interim Report (December 1985).
- R.E. Maerker:
  FLUENS - A Module in the LEPRICON Computer Code System for
  Obtaining Weighted Spectral Fluences and Their Uncertainties
  EPRI Research Project 1399-1, Interim Report (December 1985).
- B.L. Broadhead et al.:
  LEPRICON Adjustment Module - A Generalized Linear Least Squares
  Data Analysis Program with Application to PWR Surveillance
  Dosimetry
  EPRI Research Project 1399-1, 1399-2, Interim Report (March 1985).
- R.E. Maerker et al.:
  The ELXSIR Cross-Section Library for LWR Pressure Vessel
  Irradiation Studies - Part of the LEPRICON Computer Code System
  EPRI-NP3654 (September 1984).

11. MACHINE REQUIREMENTS:  LEPRICON runs on the IBM 3033.

LEPRICON required for execution of the test case 1976 Kbytes of IBM 3090 main storage.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The sample cases  were executed under OS/VS2 using the IBM VS FORTRAN compiler (Level  2.2.0). The language level flag must be set to 66. The LEPRICON source (file 23) should be compiled with OPT=1.

The test cases were run on IBM 3090 under MVS/XA. The source codes were compiled with the VS FORTRAN compiler version 2.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

File name	File description	Records
PSR0277_01.001	Information file	178
PSR0277_01.002	DOTSOR source	1933
PSR0277_01.003	DOTSOR sample input	1610
PSR0277_01.004	DOTSOR sample output	4438
PSR0277_01.005	DOTSOR JCL	105
PSR0277_01.006	BCBN source	45
PSR0277_01.007	BCBN JCL	108
PSR0277_01.008	ELXSIR cross-section library	33722
PSR0277_01.009	DOTSYN source	901
PSR0277_01.010	DOTSYN sample input	310
PSR0277_01.011	DOTSYN sample output	1804
PSR0277_01.012	DOTSYN JCL	114
PSR0277_01.013	TIMPATCH source	431
PSR0277_01.014	TIMPATCH sample input	364
PSR0277_01.015	TIMPATCH sample output	2716
PSR0277_01.016	TIMPATCH unit 21 input data	269
PSR0277_01.017	TIMPATCH unit 22 input data	269
PSR0277_01.018	TIMPATCH JCL	110
PSR0277_01.019	FLUENS source	219
PSR0277_01.020	FLUENS sample input	19
PSR0277_01.021	FLUENS sample output	282
PSR0277_01.022	FLUENS unit 2 input data	925
PSR0277_01.023	FLUENS unit 3 input data	925
PSR0277_01.024	FLUENS unit 1 input data	21
PSR0277_01.025	FLUENS JCL	108
PSR0277_01.026	ISOPLOT4 source	2411
PSR0277_01.027	ISOPLOT4 sample input	417
PSR0277_01.028	ISOPLOT4 sample output	1405
PSR0277_01.029	ISOPLOT4 JCL	25
PSR0277_01.030	FIDAS source	691
PSR0277_01.031	LEPRICON source	5888
PSR0277_01.032	SENPRO data	19989
PSR0277_01.033	COVERX data	30162
PSR0277_01.034	Benchmark data (test case 1)	236
PSR0277_01.035	Linkage editor input for LEPRICON	13
PSR0277_01.036	LEPRICON sample input (test case 1)	45
PSR0277_01.037	LEPRICON sample output (test case 1)	2682
PSR0277_01.038	LEPRICON JCL (test case 1)	138
PSR0277_01.039	COVERX updated data for test case 2	30162
PSR0277_01.040	Benchmark data for test case 2	236
PSR0277_01.041	LEPRICON sample input (test case 2)	39
PSR0277_01.042	LEPRICON sample output (test case 2)	2012
PSR0277_01.043	LEPRICON JCL (test case 2)	129
PSR0277_01.044	RFLUX for DOTSYN (binary)	20
PSR0277_01.045	RZFLUX for DOTSYN (binary)	2167
PSR0277_01.046	RTFLUX for DOTSYN (binary)	1984
PSR0277_01.047	ADJOINT for TIMPATCH (binary)	2020