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Safety Recommendation Details

Safety Recommendation R-95-009
Details
Synopsis: ON 6/6/94, A CONDUCTOR FOR THE NORFOLK SOUTHERN RAILWAY COMPANY DETECTED PRODUCT LEAKING FROM THE BOTTOM OF TANK CAR UTLX 79211 IN THE NORFOLK SOUTHERN HARRY DEBUTTS YARD IN CHATTANOOGA, TENNESSEE. THE TANK CAR CONTAINED 12,184 GALLONS OF A 75-PERCENT CONCENTRATION OF ARSENIC ACID, WHICH IS CLASSIFIED AS A POISONOUS MATERIAL & ALSO DESIGNATED AS A MARINE POLLUTANT UNDER THE DEPARTMENT OF TRANSPORTATION HAZARDOUS MATERIALS REGULATIONS.
Recommendation: THE NTSB RECOMMENDS THAT THE FRA: EVALUATE, WITH THE ASSISTANCE OF THE RAILWAY PROGRESS INSTITUTE & THE ASSOCIATION OF AMERICAN RAILROADS, THE FAILURE RATE & THE MODE OF FAILURE OF BOWL-SHAPED SUMPS & EDUCATION PIPE BRACING SYSTEMS IN TANK CARS TRANSPORTING HAZARDOUS MATERIALS, & BASED ON THE RESULTS OF THIS EVALUATION, REQUIRE REPAIRS OR MODIFICATIONS TO PREVENT MECHANICAL DAMAGE TO COATINGS OR LININGS & SUBSEQUENTLY TO THE TANKS FROM MISALIGNED COMPONENTS OF THE EDUCATION PIPE SYSTEMS IN TANK CARS.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Railroad
Location: Chattanooga, TN, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA94SZ011
Accident Reports: ‚ÄčTank Car Failure and Release of Arsenic Acid
Report #: HZM-95-01
Accident Date: 6/6/1994
Issue Date: 3/2/1995
Date Closed: 2/14/2003
Addressee(s) and Addressee Status: FRA (Closed - Acceptable Action)
Keyword(s): Hazmat

Safety Recommendation History
From: NTSB
To: FRA
Date: 2/14/2003
Response: The Safety Board notes that the railroad industry, in cooperation with the FRA, modified the AAR Tank Car Manual, M-1003, section 2.2.4.1, to improve the design and maintenance requirements for bowl-shaped sumps. As the modification to the design and maintenance requirements addresses the Board's recommendation, Safety Recommendation R-95-9 is classified "Closed--Acceptable Action."

From: FRA
To: NTSB
Date: 10/4/2002
Response: Letter Mail Controlled 10/11/2002 4:09:51 PM MC# 2020860 The Safety Board issued this recommendation because it found that the non-concentricity of the education pipe with the sump could cause mechanical damage to the coating at the sump resulting in the potential corrosion and failure of the tank shell. The railroad industry, in cooperation with FRA, modified the Association of American Railroads (AAR) Tank Car Manual, M-l003, section 2.2.4.1, to improve the design and maintenance requirements for bowl-shaped sumps. A copy of the modification is enclosed.

From: NTSB
To: FRA
Date: 8/13/1997
Response: THE BOARD NOTES THAT FRA IS WORKING WITH THESE ORGANIZATIONS THROUGH THE AAR TANK CAR COMMITTEE & THAT A TASK GROUP EVALUATING THE PERFORMANCE OF THE BOWL-SHAPED SUMPS IS SCHDULED TO PRESENT ITS FORMAL PROPOSAL TO THE COMMITTEE BY JULY 1997. BECAUSE OF THE PROGRESS, R-95-9 REMAINS CLASSIFIED "OPEN--ACCEPTABLE RESPONSE."

From: FRA
To: NTSB
Date: 3/25/1997
Response: AS SUGGESTED BY THE BOARD, THE FRA RPI, & AAR ARE EVALUATING THE MODE OF FAILURE & FAILURE RATE OF BOWL-SHAPED SUMPS THROUGH AN AAR TANK CAR COMMITTEE TASK GROUP UNDER DOCKET T94.26-95. AFTER REVIEWING THE DATA IN RSPA'S INCIDENT REPORTING SYSTEM & THE DESIGN DRAWINGS FROM EACH OF THE MAJOR TANK CAR BUILDERS, THE TASK GROUP EXPECTS THAT IT WILL FORMALIZE ITS PROPOSAL TO THE TANK CAR COMMITTEE BY JULY OF THIS YEAR. FRA WILL KEEP THE BOARD INFORMED OF ITS PROGRESS.

From: NTSB
To: FRA
Date: 6/23/1995
Response: THE BOARD NOTES THAT THE FRA AGREES WITH THE RECOMMENDATION & WILL WORK WITH THE RPI & THE AAR TO EVALUATE THESE SYSTEMS. WE WOULD APPRECIATE RECEIVING PERIODIC UPDATES ON THE PROGRESS OF THE EVALUATION & ITS RESULT. PENDING COMPLETION OF THE EVALUATION, R-95-9 IS CLASSIFIED "OPEN-ACCEPTABLE RESPONSE."

From: FRA
To: NTSB
Date: 4/14/1995
Response: FRA AGREES WITH THE NTSB'S FINDINGS & RECOMMENDATION RELATING TO THE NEED FOR THE FRA TO EVALUATE THE FAILURE RATE & MODE OF FAILURE OF BOWL-SHAPED SUMPS & EDUCTION PIPE BRACING SYSTEMS IN TANK CARS TRANSPORTING HAZARDOUS MATERIALS. THE FRA, ALONG WITH THE ASSOCIATION OF AMERICAN RAILROADS & THE RAILWAY PROGRESS INSTITUTE, WILL EVALUATE THESE SYSTEMS.