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NTSB ADVISORY
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National Transportation Safety Board
Washington, DC 20594

January 21, 2011

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NTSB RELEASES FIRST OF SIX FACTUAL REPORTS ON SAN BRUNO
PIPELINE RUPTURE INVESTIGATION   

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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:
http://www.ntsb.gov/Dockets/PipeLine/DCA10MP008/458194.pdf

It can also be accessed from the Board’s homepage under
“Accident Dockets”.

RELATED INFORMATION
Urgent safety recommendations and announcement of fact-
finding hearing: (1/3/11): http://go.usa.gov/rZ3

Investigative update (12/14/10): http://go.usa.gov/1oq

Preliminary Report (10/13/10): http://go.usa.gov/rMY

Announcement of launch of investigation (9/10/10):
http://go.usa.gov/rMg

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NTSB Public Affairs: 202-314-6100