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Forwards AEOD/T90-04, "Reverse (Backward) Acting Valve Manual Handwheels," technical review rept.Investigation initiated by unsuspected reversed rotation of atmospheric dump valve manual handwheels at Palo Verde Unit 3.

Accession Number: ML20033F728

Date Released: Sunday, November 8, 2020

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• ML20033F727 - Forwards AEOD/T90-04, "Reverse (Backward) Acting Valve Manual Handwheels," technical review rept.Investigation initiated by unsuspected reversed rotation of atmospheric dump valve manual handwheels at Palo Verde Unit 3. (1 page(s), 3/20/1990)
• ML20033F729 - "Reverse (Backward) Acting Valve Manual Handwheels," AEOD Technical Review Rept AEOD/T90-04.On 890303,fault on grid caused main generator breakers to open & unit separated from grid,resulting in reactor trip main steam isolation signal. (4 page(s), 3/20/1990)