Selected Component Failure Rate Values from Fusion Safety Assessment Tasks Page: 4 of 82
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This report is a compilation of component failure rate and repair rate values that
can be used in magnetic fusion safety assessment tasks. The data were collected from
literature reviews of fission, fusion, and other industrial equipment operating experiences,
and by use of analyst judgment. The values given here have been used for safety and
environmental assessments during the course of the International Thermonuclear
Experimental Reactor (ITER) Engineering Design Activity (EDA). One purpose of this
report is to archive the data. The second purpose is to document the data for possible
future uses on other designs. Since these data are rather generic in nature they can be
useful to other magnetic fusion designs that use plant equipment similar to ITER, such as
vent stack gas cleanup systems and plasma shutdown systems. Failure and repair rates for
vacuum system components are also included here. Values for water cooling system
components have also been harvested and are reported here. The report concludes with
the examination of some equipment important to personnel safety, primarily sensors to
detect hazardous conditions such as oxygen deficiency, toxic gases in the atmosphere,
combustible gas releases, and airborne releases of radioactivity. The third purpose of this
report is to compile data that are useful to the International Energy Agency's Cooperative
Agreement on the Environmental, Safety and Economic Aspects of Fusion Energy. Task
7 in that agreement is the collaboration of interested parties to construct a data bank of
component failure rate data for magnetic fusion usage. This report should be useful to
system designers to calculate scoping values for the availability and repair intervals for
their systems, and for probabilistic safety or risk analysts to assess fusion systems for
safety of the public and the workers.
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Cadwallader, Lee Charles. Selected Component Failure Rate Values from Fusion Safety Assessment Tasks, report, September 1, 1998; [Idaho Falls, Idaho]. (digital.library.unt.edu/ark:/67531/metadc889049/m1/4/: accessed February 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.