BP...and Transocean...lacked clear guidelines for key tests to ensure that the ill-fated Macondo well was safely sealed before it ruptured and triggered the 2010 Deepwater Horizon disaster, U.S. safety investigators said. The preliminary report from the U.S. Chemical Safety Board...puts the spotlight back on missteps highlighted in prior investigations as BP faces potential civil and even criminal penalties over the incident..."Transocean is committed to continuous improvement in both personal and process safety performance," Transocean spokesman Brian Kennedy said...A BP spokesman said the accident "was the result of multiple causes, involving multiple parties," and that the company "has taken concrete steps to further enhance safety and risk management,"...