The ODSCC detected in the TSP position of Ulchin 3&4 SGs are typical ODSCC of Alloy 600MA tubes. The causative chemical environment is formed by concentration of impurities inside the occluded region formed by the tube surface. egg crate strips. and sludge deposit there. https://www.roneverhart.com/Corvette-Leather-Seat-Covers-Graphite-Standard-1984-1987/