LONDON (Dow Jones)--Oil major BP PLC (BP) told The Sunday Telegraph it didn't use an industry standard process to assess risk on any of its U.S. oil wells, the paper reports Sunday. The procedure, known as a safety case, was developed after the Piper Alpha oil rig explosion in 1988. Royal Dutch Shell PLC (RDSB.LN) confirmed it always develops safety cases. However BP said it didn't have a safety case for the Macondo oil well in the Gulf of Mexico, which exploded in April and is still leaking oil, the paper reports. -By London Energy Desk, Dow Jones Newswires; +44 207 842 9262; [email protected] (END) Dow Jones Newswires July 04, 2010 06:53 ET (10:53 GMT)