■HGT promotion status・There are occurrence concentrations by supplier’s production material lot ( 3,6,7,9, others) rather than production months of failed parts.・Density of products seems to be reduced depending on production condition, material and production lot.・No. of cracks on the surface layer is obviously different between keep samples and market collected parts.・Pump assy is cracked and impeller itself is not cracked.・The crack is GF interfacial peeling which frequently occurs with low density parts.・Crack (interfacial peeling) increases by low density and soak for a long period (Dry).■Emergency measures started in production at supplier on Jul. 15(Supplier’s own improvement①Change the gate when molding impeller / ② Enlarge clearance between impeller and cover