The CCPS Taxonomy and Its Use

External environment, for example, vibration, temperature, humidity. 

Fabrication techniques, inspection procedures, installation praetices (except as noted). 

Service stress, for example, heavy, medium or light duty. 

As shown in this figure, the format is divided into three main columns labeled Equipment Description, Service Description, and Failure Description. The Equipment Description column may be further divided to show the necessary equipment description levels that make up the taxonomy number. Each column represents one additional hierarchical level and number in the CCPS Taxonomy. Similarly, the Service and Failure Descriptions are divided as needed to fully establish the data cells. An entry or group of entries in a column apply all the way down the column until an additional entry or a horizontal line is reached. 

Borkowski, R. J., Pike, D. H., and Goldberg, F.F. The In-Plant Reliability Data Base for Nuclear Power Plant Components Data Collection and Methodology Report. NUREG/CR-2641, ORNL/TM-9216, January 1985. 

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