Computer program calculates fission product inventories and source strengths associated with the operation of U-235 fueled nuclear power reactor. It utilizes a fission-product nuclide library of 254 nuclides, and calculates the time dependent behavior of the fission product nuclides formed by fissioning of U-235

Brown, W. S.

Call, D. W.

English

NASA Technical Reports Server

rovember 1967 Brief 67-10450 
toy C
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(k)	 AEC-NASA TECH BRIEF 
TES 0F 
AEC-NASA Tech Briefs describe innovations resulting from the research and development program 
of the U.S. AEC or from AEC-NASA interagency efforts. They are issued to encourage commercial 
application. Tech Briefs are published by NASA and may be purchased, at 15 cents each, from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Computer Program FPIP—REV Calculates Fission Product Inventory 
for U-235 Fission 
The problem: 
To design a computer program that will calculate 
fission product inventories and source strengths 
associated with the operation of U-235 fueled nuclear 
power reactor. 
The solution: 
A computer program that utilizes a fission-product 
nuclide library of 254 nuclides, and calculates the time 
dependent behavior of the fission product nuclides 
formed by fissioning of U-235. 
How it's done: 
The computer program requires two major inputs: 
(I) a library tape with the recorded physical constants 
of 254 fission product nuclides, and (2) the reactor 
operating history, power levels, and times after shut-
down that inventory is required. 
The Revised Fission Product Inventory Program 
(FPIP-REV) calculates the time behavior of 254 
fission product nuclides formed by fissioning of 
U-235 resulting from a specified reactor operating 
history. The operating history can consist of as many 
as six separate operating periods, each at an arbitrary 
power level. The activity is calculated for each nuclide 
and summed for the total inventory. In addition, the 
program calculates the gamma and beta radiation 
energy source strengths (Mev/sec) in each of seven 
gamma and five beta energy groups versus time after 
shutdown (decay time). The energy limits of the 
grouping are arbitrary. Also the integrated gamma 
and beta source strengths (Mev) per group are de-
termined for each decay time; the integration time
extends from the decay time to a given fixed upper 
time limit. 
The program has the following limitations: 
(1) A maximum of 50 decay time points can be 
calculated per run. For multiple reactor startups 
the activity and source strength output data can 
be printed only for the time of final shutdown, 
or for decay times subsequent to final shut-
down. 
(2) A maximum of six separate operating periods 
can be used to describe the reactor operating 
history. 
(3) The time interval for integration of the gamma 
and beta source strengths is arbitrary but is 
Fixed for each problem. If varied integration 
time intervals are desired, the program must be 
rerun. 
Notes: 
1. This program is written in Fortran IV for use on 
the CDC 6600 computer. 
2. Inquiries concerning this program may be made to: 
COSMIC 
Computer Center 
University of Georgia 
Athens, Georgia 30601 
Reference: B67-10450 
Patent status: 
No patent action is contemplated by AEC or 
NASA.
Source: W. S. Brown and D. W. Call 
of Westinghouse Astronuclear Laboratory 
under contract to
AEC-NASA Space Nuclear Propulsion Office
(N UC- 10089)
Category 06 
I
This document was prepared under the sponsorship of the Atomic 
Energy Commission and/or the National Aeronautics and Space 
Administration. Neither the United States Government nor any per-
son acting on behalf of the United States Government assumes any
liability resulting from the use of the information contained in this 
document, or warrants that the use of any information, apparatus, 
method, or process disclosed in this document may not infringe pri-
vately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19670000450 2020-03-11T21:12:52+00:00Z


Computer program FPIP-REV calculates fission product inventory for U-235 fission

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