NRC Information No. 90-17: Weight and center of gravity discrepancies for Copes-Vulcan valves

As discussed in Information Notice 89-28, ''Weight and Center of Gravity Discrepancies for Copes-Vulcan Air-Operated Valves,'' significant discrepancies were discovered in valve weight and center of gravity information for small bore air-operated valves supplied by Copes-Vulcan. Recent information obtained during NRC staff inspections at Westinghouse and Copes-Vulcan also identified additional weight and center of gravity discrepancies in large bore valves ranging in size up to 16-inches which include air-operated valves, motor-operated valves and check valves. Westinghouse Electric Corporation and Copes-Vulcan prepared an extensive set of revised valve drawings showing the corrected weights and centers of gravity. Westinghouse compiled these drawings into two valve lists, date July 17 and August 14, 1989, that represented a complete set of correct weights and centers of gravity as was then currently known to them. However, these valves represented only a portion of the total population of valves that Westinghouse had supplied to various licensees. Consequently, pending an in-depth review of all Copes-Vulcan valve drawings and the confirmation of their applicability to Westinghouse-supplied valves, these lists cannot be considered final. NRC has condensed the information provided by Westinghouse into Tables 1 and 2, which are attached. These tables provide a brief description of the type and class of the valves most significantly affected by these corrections; grouped by weight increases and center of gravity increases, respectively