1. NAME AND TITLE
BURP2: Calculation of Buildup and Decay of Radioactive Fission Products.
Babcock and Wilcox, Atomic Energy Division, Lynchburg, Virginia.
3. CODING LANGUAGE AND COMPUTER
FORTRAN IV; CDC 6600.
4. NATURE OF PROBLEM SOLVED
BURP2 calculates the activity of 237 radioactive fission products for up to 100 consecutive
reactor operating and shutdown times. Fission products can be allowed to leak from the fuel at any
specified rate. The activity of each nuclide is calculated in the fuel, coolant, and purification filter
system. The total gamma-ray source strengths are calculated at each time step in the core, coolant,
and purification filter system. For each time step, new values may be assigned to the reactor
power, thermal neutron flux, fraction of the total fissions due to one or two fissioning isotopes, and
the coolant and filter cleanup rates. The user must assign a filter purification efficiency, a fuel leak
rate and a plate out rate for each fission product. Removal of fission products by neutron
absorption is included in the fuel but not in the coolant or filter. The activated fission product is
not returned to the fuel. Activation of structural materials is not considered. The user has the
option of saving his data on tape for further processing.
5. METHOD OF SOLUTION
BURP2 obtains the analytical solution of up to 5 coupled differential equations describing the
buildup and loss of radioactive fission products in a nuclear fuel or reactor system. The fission
product concentration obtained from these equations is used to calculate activities and gamma-ray
source strength. Gamma ray yields for six energy groups; fission yields for 235U; 239Pu, and 238U;
thermal absorption cross sections; branching fractions; and decay constants are internally stored in
6. RESTRICTIONS OR LIMITATIONS
Parameters are limited as follows: number of purification and leak rate tables nu24u 5, number
of time steps < 100, number of photon energy groups = 6.
7. TYPICAL RUNNING TIME
No study has been made by RSIC of typical running times for BURP2.
8. COMPUTER HARDWARE REQUIREMENTS
BURP2 is operable on the CDC 6600 computer.
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN IV compiler is required.
J. B. Perry and J. M. Alcorn, "BURPA Computer Program for Calculating Buildup and
Decay of Radioactive Fission Products," Informal Notes (November 1966).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
May 1974; updated August 1975.
KEYWORDS: FISSION PRODUCT INVENTORY; GAMMA-RAY SOURCE