The following is a summary of the information from the email provided:
[The] soft seat main disc and pilot disc assemblies are installed in certain process solenoid operated valves, some of which perform safety related functions such as containment isolation. These designs include a soft seat insert in the main and/or pilot disc that could loosen and potentially result in excessive leakage or failure of the valve to operate properly.
Supplier:
Target Rock, Business Unit of Curtiss-Wright Flow Control Corporation
1966E Broadhollow Road, East Farmingdale, NY 11735
Should you have any questions regarding this matter, please contact Michael Cinque, General Manager at (631) 293-3800.
Plant Site Locations:
Arkansas Nuclear One, Grand Gulf, Peach Bottom, Sequoyah, Browns Ferry, Hatch, Perry, Shearon Harris, Brunswick, Limerick, Pilgrim, South
Texas, Dresden, Millstone, Quad Cities, Susquehanna, Duane Arnold, Nine Mile Point, River Bend, Three Mile Island, Fermi, Palo Verde, Saint Lucie, Watts Bar.