Centralized Reliability Data Organization (CREDO) assessment of critical component unavailability in liquid metal reactors

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7164752

Koger, K H; Haire, M J; Humphrys, B L; Manneschmidt, J F; Setoguchi, K; Nakai, R

The Centralized Reliability Data Organization (CREDO) is the largest repository of liquid metal reactor (LMR) component reliability data in the world. It is jointly sponsored by the US Dept. of Energy (DOE) and the Power Reactor and Nuclear Fuel Development Corporation (PNC) of Japan. The CREDO data base contains information on a population of more than 20,000 components and approximately 1500 event records. A conservative estimation is that the total component operating hours is approaching 2.2 billion hours. The work reported here focuses on the availability information contained in CREDO and the development of availability critical items lists. That is, individual components are ranked in prioritized lists from worst to best performers from an availability standpoint. Availability as used here is an inherent characteristics of the component and is not necessarily related to plant operability. A major observation is that a few components have a much higher unavailability factor than the average. The top fifteen components contribute 93%, 77%, and 87% of the total system unavailability for EBR-II, FFTF, and JOYO respectively. Critical components common to all three sites are mechanical pumps and electromagnetic pumps. Application of resources to these components with the highest unavailability will have the greatest effect on overall availability. All three sites demonstrate that low maintainability (i.e., long repair times), rather than unreliability (i.e., high failure rates), are the main contributors, by about a two-to-one margin, to liquid metal system unavailability.

• Research Organization: Oak Ridge National Lab., TN (USA); Power Reactor and Nuclear Fuel Development Corp., Oarai, Ibaraki (Japan). Oarai Engineering Center; Power Reactor and Nuclear Fuel Development Corp., Tokyo (Japan)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7164752
• Report Number(s): CONF-880601-34; ON: DE88011847
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500* -- Power Reactors
Breeding
DATA
DATA BASE MANAGEMENT
DATA COMPILATION
INFORMATION
INFORMATION NEEDS
LIQUID METAL COOLED REACTORS
MANAGEMENT
NATIONAL ORGANIZATIONS
ORNL
REACTOR COMPONENTS
REACTORS
RELIABILITY
US AEC
US DOE
US ERDA
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