Hanford Single-Shell Tank Leak Causes and Locations - 241-SX Farm Page: 16 of 611
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RPP-RPT-54910, Rev. 0
3.0 SX FARM COMMONALITIES
3.1 TANK DESIGN/CONSTRUCTION
3.1.1 Tank Design
The SX Farm tanks had multiple design features that could contribute to stresses or possible leak
paths when the tank was being operated including:
" Orthogonal intersection between the steel bottom and the sidewall
" Fillet weld used between the bottom and sidewall intersection
" Less rigorous weld inspection testing
" Partial asphaltic membrane waterproofing
" Keyed construction joints in the sidewall
These features are common to all SX Farm tanks.
The steel bottom of the SX Farm tanks intersects the sidewalls orthogonally similar to 241-A
Farm tanks rather than the knuckle transitions (BPF-73550, Drawings D-2 and D-3, Specification
for Construction of Composite Storage Tanks (B, C, T, and U Tank Farms)) in earlier designed
tank farms. The SX Farm tank footing to the first keyed wall construction joint is shown on
Figure 3-1 (H-2-39512, 75 FT. Tank Base Footing and Wall Reinforcing, Waste Disposal
Facility, 241-SX). This figure shows the orthogonal intersection between the dished bottom and
the sidewall, water stop at the base footing to wall construction joint, and other details. The 7-in
wide water stop at the footing construction joint extends 2 -in above the joint and 4 3-in below
the joint. The earlier 241-BCTU Farm tanks notched footing construction joint does not
incorporate a water stop.
Figure 3-2 shows the detail of the orthogonal intersection between the bottom and the sidewall
with a fillet weld between the bottom and sidewall orthogonal intersection (detail H-2-39511,
Rev 3). Full penetration butt welds for BCTU Farm tanks are shown on BPF-73550 (Drawings
D-2 and D-3) for the rounded knuckle configuration shown in Figure 3-3.
The three-ply asphaltic membrane waterproofing between the liner sidewall and the concrete
shell was eliminated from the design of the SX Farm tanks (see Figure 3-2). An asphaltic
membrane was incorporated between the concrete footing and the grout below the liner. The
design for BCTU Farm is shown in Figure 3-3 which shows the rounded knuckle configuration
with the bottom, knuckle, and sidewall three-ply water proofing.
Other design specification changes for the SX Farm tanks included less rigorous weld testing
with the Vacuum Soap Test at 10-in of mercury or other Atomic Energy Commission approved
methods (HW-4957, SX Farm Specifications). An example of an alternate method may have
been full penetration X-Ray weld testing. Spot X-Ray testing of the welds was specified for SX
Farm tanks per H-2-39511. Specifications required X-Ray of all welds for the BCTU Farm tanks
(BPF-73550).3-5
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Girardot, Crystal L. & Harlow, Donald G. Hanford Single-Shell Tank Leak Causes and Locations - 241-SX Farm, report, January 8, 2014; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc870771/m1/16/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.