Hydrodynamically induced loads on components submerged in high-level waste-storage tanks

Conference · Wed Jun 01 04:00:00 EDT 1994

OSTI ID:10142548

Weiner, E O; Julyk, J L; Rezvani, M A

This paper addresses the effects of added mass on components submerged in fluids. In particular, as new equipment is designed for installation in the double-shell waste-storage tanks at the Hanford Site near Richland, Washington, the equipment and the tank must be evaluated for the anticipated loads. Seismically induced loads combined with loadings from other sources must be considered during this evaluation. A literature review shows that, for components in fluids confined to a narrow annulus or without a free surface, drastic reductions in response to seismic excitation are predicted by two-dimensional analysis. This phenomenon has been supported by testing. The reductions are explained in terms of mass coupling and buoyancy effects. For equipment submerged in fluids having a free surface and large annulus, practice suggest that it is appropriate to lump the added-mass terms with the component to address the hydrodynamic effects adequately. As in the case of a narrow annulus, this practice will reduce the natural frequency of the submerged component, but generally will increase the loads. This paper presents the structural evaluations of submerged components using computer models that employ mock fluid elements that determine the appropriateness of considering fluid added-mass and buoyancy effects. The results indicate that if a free surface exists and the submerged component has a wide fluid annulus about it, then the added mass should be lumped with the model, and buoyancy effects are not significant. The component then may be considered to be in an air environment, and the stresses are calculated from the application of standard response spectrum procedures.

• Research Organization: Westinghouse Hanford Co., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-87RL10930
• OSTI ID: 10142548
• Report Number(s): WHC-SA--2118; CONF-940613--5; ON: DE94009663; BR: 35AF11201/35AF11202
• Country of Publication: United States
• Language: English

Related Subjects

052002
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
99 GENERAL AND MISCELLANEOUS
990200
COMPUTERIZED SIMULATION
DYNAMIC LOADS
FINITE ELEMENT METHOD
HANFORD RESERVATION
MATHEMATICS AND COMPUTERS
ONE-DIMENSIONAL CALCULATIONS
STATIC LOADS
TANKS
TWO-DIMENSIONAL CALCULATIONS
UNDERGROUND STORAGE
WASTE DISPOSAL AND STORAGE