Analysis of sodium valve reliability data at CREDO. [LMFBR] Page: 3 of 13
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ANALYSIS OF SODIUM VALVE RELIABILITY DATA AT CREDO
T. F. Bott and P. M. Haas
Oak Ridge National Laboratory
Oak Ridge, Tennessee
The Centralized Reliability Data Organization (CREDO) has been established
at Oak Ridge National Laboratory (ORNL) by the Department of Energy to provide
a national center for collection, evaluation and dissemination of reliability
data for advanced reactors. The general goals and program plan for development
of CREDO have been outlined previously.1*2 The current schedule calls for
development at a moderate pace, with the first major distribution of data in
late FY-1980. Procedures for continuous collection of engineering, operating
and event data at EBR-II and FFTF are being initiated now. Collection of
comprehensive engineering data is a major task, and is not expected to be
completed at EBR-II until the end of FY-1981, and at FFTF until mid-FY-1982.
While the system is being developed and continuous data collection at
these two U.S. reactor sites is being established, data on advanced reactor
components which have been in use at U.S. test loops and experimental reactors
have been collected and analyzed. Engineering, operating and event data on
sodium valves, pumps, flowmeters, rupture discs, heat exchangers and cold
traps have been collected from more than a dozen sites. By far the most
abundant data available are on sodium valves. This paper summarizes results
of statistical analyses of these "historical1' valve data collected to date.
Table 1 lists the sodium valves included in these analyses. A total of
more than 700 valves ranging in size from 1/4-in. to 6-in., and a total of
nearly 37 million valve-hours of operation are included. The documentation
and availability of personnel varied greatly from site to site, and data-
collection procedures and formats were tailored to accommodate the individual
sites. In some cases it was possible to extract data from published records
(note references in Table 1), but the importance of securing the assistance
of experienced site personnel rapidly became apparent. (The help of numerous
staff members at the sites is gratefully acknowledged.)
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Bott, T F & Haas, P M. Analysis of sodium valve reliability data at CREDO. [LMFBR], article, January 1, 1979; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1100705/m1/3/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.