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Cladding creepdown under compression. [BWR; PWR]

Description: Light-water power reactors use Zircaloy tubing as cladding to contain the UO/sub 2/ fuel pellets. In-service operating conditions impose an external hydrostatic force on the cladding, causing it to creep down into eventual contact with the fuel. Knowledge of the rate of such creepdown is of great importance to modelers of fuel element performance. An experimental system was devised for studying creepdown that meets several severe requirements by providing (1) correct stress state, (2) multiple … more
Date: November 9, 1977
Creator: Hobson, D.O.
Partner: UNT Libraries Government Documents Department
open access

Summary of calculations of dynamic response characteristics and design stress of the 1/5 scale PSE torus. [BWR; MK1 pressure suppression system]

Description: The Lawrence Livermore Laboratory is currently involved in a 1/5 scale testing program on the Mark I BWR pressure suppression system. A key element of the test setup is a pressure vessel that is a 90/sup 0/ sector of a torus. Proper performance of the 90/sup 0/ torus depends on its structural integrity and structural dynamic characteristics. It must sustain the internal pressurization of the planned tests, and its dynamic response to the transient test loads should be minimal. If the structural… more
Date: February 9, 1977
Creator: Arthur, D.
Partner: UNT Libraries Government Documents Department
open access

Unsteady jet-slug dynamics. [BWR]

Description: The present analysis treats the transient load characteristics at the wet-well bottom during the vent-clearing event under loss-of-coolant accident conditions. A conceptual model is introduced wherein the liquid-jet inertia and the net momentum-efflux are the two dominant physical factors. The derived load-history equations were found to be functions of the vent-clearing characteristics and of the jet-decay mode in the liquid pool. The theoretical results obtained by a physical modelling of the… more
Date: September 9, 1977
Creator: Kang, S. W.
Partner: UNT Libraries Government Documents Department
open access

A New Computational Tool for Simulation of 3-D Flow and Heat Transfer in Boiling Water Reactors

Description: This Phase I work has developed a novel hybrid Lattice Boltzmann Model for the simulation of nonideal fluid thermal dynamics and demonstrated that this model can be used to simulate fundamental two-phase flow processes including boiling initiation, bubble formation and coalescency, and flow-regime formation.
Date: December 9, 2002
Creator: Chen, Hudong
Partner: UNT Libraries Government Documents Department
open access

THERMAL EVALUATION OF THE CONCEPTUAL 40 BWR MULTI-PURPOSE CANISTER (MPC) WITH ACD DISPOSAL CONTAINER (SCPB: N/A)

Description: This analysis is prepared by the Mined Geologic Disposal System (MGDS) Waste Package Development Department (WPDD) as specified in the Waste Package Implementation Plan and Waste Package Plan. The design data request addressed herein is: (1) Characterize the conceptual 40 BWR Multi-Purpose Canister (MPC) Waste Package (WP) design to show that the design is feasible for use in the MGDS environment. The purpose of this analysis is to respond to a concern that the long-term disposal thermal issues… more
Date: November 9, 1995
Creator: Lotz, T.L.
Partner: UNT Libraries Government Documents Department
open access

BWR pool dynamics in a loss of coolant accident. Calculation of the air-venting phase

Description: The authors calculated the air-venting phase of a loss of coolant accident (LOCA) in a BWR pool using both compressible and incompressible finite difference schemes, and compared the results with experiments made at the University of California, Los Angeles and the Massachusetts Institute of Technology. The incompressible approach was found to be the most effective, because of the very low flow Mach numbers involved. Theory and experiment were in good agreement.
Date: March 9, 1978
Creator: Glenn, L. A. & McMaster, W. H.
Partner: UNT Libraries Government Documents Department
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