National Transportation Safety Board
Office of Public Affairs
The National Transportation Safety Board today released the first of its factual reports on the natural gas pipeline rupture and explosion that killed eight people in San Bruno, Calif., on September 9, 2010.
The Metallurgical Group Factual Report documents the facts related to the as-received visual and non-destructive examination and fractography of the ruptured 30-inch diameter steel pipe segment. The report does not include any analysis of the factual information contained in it; it is one of a series of factual reports that the NTSB is developing during the course of the investigation.
Additional reports on operations, human performance, survival factors, fire scene, and meteorology, will be released on the first day of the fact-finding investigative hearing that the NTSB will hold in Washington, DC, in March. The hearing, originally scheduled for two days, has been expanded to three days (March 1-3) due to the number of issues to be examined.
Analysis of the accident, along with conclusions and a determination of probable cause, will come at a later date when the final report on the investigation is completed.
This is an information release only; no interviews will be conducted, and no analysis or commentary will be provided.
Metallurgical Group Factual Report (Accident Docket, File ID 458194)
Urgent safety recommendations and announcement of fact-finding hearing (1/3/11)
Investigative update (12/14/10)
Preliminary Report (10/13/10)
Announcement of launch of investigation (9/10/10)
NTSB Office of Public Affairs: (202) 314-6100
The National Transportation Safety Board (NTSB) is an independent federal agency charged with determining the probable cause
of transportation accidents, promoting transportation safety, and assisting victims of transportation accidents and their families.