<prompt> Pedzisa mutsara unotevera:  <response>: Three Mile Island tsaona uye njodzi yeChernobyl, Westinghouse yakasiya chivakwa chikuru nekutanga kwema1990, uye nzvimbo yacho yakabhadharwa kune vanoverengeka varimi vezvekutengesa. Muna 1994, boka raimbova vashandi panzvimbo iyi rakaumba Pittsburgh Materials Technology Inc. PMTI kuvaka pamusoro pezvigadzirwa zvakagadzirwa neWestinghouse, kusanganisira advanced refractory metal alloys. Muna 2007, PMTI ichiri kunyungudutsa, kugadzira uye kuyedza alloys senge niobium-base, tantalum-base, uye vanadium-base maumbirwo kune akasiyana vatengi mune ese ari maviri aerospace nemaindasitiri zvikamu. 