662-E solid waste silo-plug lifting analysis
The Intermediate Level Tritium Vault No. 1, 662-E, Cell No. 1 contains 140 waste silos. Each silo is approximately 25 feet deep, 30 inches in diameter at the top and covered by a reinforced concrete plug. Two No. 4 reinforcing bars project from the top of each plug for lifting. During lifting operations, the 1.5 inch concrete cover over the lifting bars spelled off 16% of the silo plugs. The No. 4 reinforcing bars were also distorted on many of the silo plugs. Thirteen of the plugs have been repaired to date. The existing silo plug lifting bars have a safe working load of 480 pounds per plug, which is less than 1/3 of the dead weight of the silo plug. The safe working load was calculated using the minimum design factor of 3 based on the yield strength or 5 based on the ultimate strength of the material, as per the Savannah River Site Hoisting and Rigging Manual. The existing design calculations were reviewed, and the following items are noted: (1) Adequate concrete cover was not provided over the horizontal portion of the lifting bars. (2) The lifting bars were allowed to yield in bending, which violates the requirements of the Savannah River Site Hoisting and Rigging Manual. (3) The ultimate strain of the lifting bars would be exceeded before the calculated ultimate strength was achieved. Alternative lifting devices are also identified.
- Research Organization:
- Westinghouse Savannah River Co., Aiken, SC (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 6486191
- Report Number(s):
- WSRC-TR-93-172; SRT-EMT-93-1035; ON: DE93014728
- Country of Publication:
- United States
- Language:
- English
Similar Records
Design of the Hoisting System for D-Zero Collision Hall Pit
Vitrification of Simulated Fernald K-65 Silo Waste at Low Temperature
Related Subjects
54 ENVIRONMENTAL SCIENCES
CLOSURES
DESIGN
MECHANICAL PROPERTIES
DISPOSAL WELLS
PLUGGING
RADIOACTIVE WASTES
BENDING
HOISTING
REINFORCED CONCRETE
SAVANNAH RIVER PLANT
TRITIUM
ULTIMATE STRENGTH
UNDERGROUND DISPOSAL
YIELD STRENGTH
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDING MATERIALS
COMPOSITE MATERIALS
CONCRETES
DEFORMATION
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MANAGEMENT
MATERIALS
MATERIALS HANDLING
NATIONAL ORGANIZATIONS
NUCLEI
ODD-EVEN NUCLEI
RADIOACTIVE MATERIALS
RADIOISOTOPES
REINFORCED MATERIALS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
WELLS
YEARS LIVING RADIOISOTOPES
052002* - Nuclear Fuels- Waste Disposal & Storage
540250 - Environment
Terrestrial- Site Resource & Use Studies- (1990-)