F-Area Type IV Tank Liner Life Estimation

Wiersman, B. J.

Savannah River Site (S.C.)

关键词: Corrosion;    Carbon Steels;    Loam;    Liners;    36 Materials Science;   

DOI  :  10.2172/881430
RP-ID  :  WSRC-TR-2005-00369
RP-ID  :  DE-AC09-96SR18500
RP-ID  :  881430

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Savannah River Site (SRS) is proceeding with closure of the Type IV waste tanks that are located in F-area. These tanks are underground concrete vaults and have been in service since the early 1960's. The interior of the concrete vault is lined with carbon steel plate. The time necessary for the carbon steel plate to disintegrate was estimated. These calculations assumed that the concrete structure was degraded and therefore the exterior of the liner is exposed to the soil conditions. Two corrosion mechanisms were examined: pitting and general corrosion. Data from soil corrosion studies performed by the National Bureau of Standards (NBS) was utilized to estimate the corrosion rate of the carbon steel liner. The following conclusions were made: (1) Cecil Clay Loam in Atlanta, Georgia, a soil tested by the NBS, is representative of the SRS soil conditions near the F-Area Type IV tanks. (2) The time to tank wall disintegration due to general corrosion only was estimated to be 770 years after concrete vault failure. (3) The time to tank wall disintegration due to pitting corrosion was estimated to be 675 years after concrete vault failure. (4) The lower bound estimate for the time to tank wall disintegration is 675 years.