Maintenance of reactor safety and control computers at a large government facility Page: 4 of 14
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HISTORY OF PROCESS COMPUTERS AT SRP
The use of computers in process applications at SRP began in 1964 when a
GE412B computer was installed in a reactor building for data acquisition and
process monitoring. The production gains realized from the initial
installation led to the installation of computers in these other reactor
buildings in 1966 and eventually to computer control of the reactors in the
early 1970’s. The GE412B control computers were replaced with dual Interdata
Model 70 computers in 1977. Dual Interdata Model 70 computers were also
installed as safety computer at this time. Vendor contract maintenance for
the CPU and peripherals was purchased for the first computer. At the end of
the first year, when plans were being initiated to perform more extensive
process monitoring in all of the reactor buildings, it became apparent that a
broader range of maintenance coverage was needed. In the 1960's, process
interfaces for computers were almost nonexistent. This was especially true in
the nuclear industry where so many special design considerations and materials
were required. Signal conditioning and output devices were designed and built
onplant and in some cases modifications were made to computer I/O circuits.
Process operations thus became dependent on computer availability and this
required 24-hour, 7-day per week maintenance coverage with minimum response
time. As the volume of specialized hardware increased and the possibility of
interaction between the different pieces of hardware developed, it became
apparent that a maintenance program was needed which would cover all of the
hardware from the field sensor to the final output device. Intimate knowledge
of the process connections was necessary to provide such a program.
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Brady, H G. Maintenance of reactor safety and control computers at a large government facility, article, January 1, 1985; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1068632/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.