ANALOG SYSTEMS FOR THE T7 FLUX TRAP CORE

Technical Report · Fri Jul 01 04:00:00 EDT 1960

OSTI ID:4014387

Bullard, B R; Kendall, R M

Analog computer studies were conducted using three different models of the T7 flux trap core subjected to a variable acceleration representing the effect of ship's motion. One model was the batch model developed previously. The other two were flow models having equations of like form but using a different method of combining the heated twophase length and the riser length. The original model combines the two sections on the basis of length. The modified floww model combines the two sections on the basis of the driving head developed across each. The three models were compared in the steady state with an apparent step change in acceleration te 1.5g. The results were in close agreement, the batch model showing a velocity variation of 20% compared to 17% for the modified-flow model and the variations in void fraction of 24 and 30%, respectively. The differences are attributed to the basic differences in the models. The steady-state model and modified core model were compared with a harmonic excitation of plus or minus 0.55 g. At the expected operating frequency of 0.16 cps, the transient nature of the modified flow model gives a maximum neutron flux of 158% compared to 178% for the batch model. The peaks are lower for the flow model than for the batch model at frequencies above 0.1 cps, but slightly higher below 0.1 cps. The Dome and Downcomer models were studied, though not as extensively as the core model. The Dome model was improved over that which was previously used by incorporating energy terms which were neglected. It was determined that the Downcomer model can be improved by incorporating in it a variable time delay, which will reduce the peak in neutron flux which occurs at 0.04 cps. (auth)

• Research Organization: General Electric Co. Flight Propulsion Lab., Dept., San Ramon, Calif.
• NSA Number: NSA-15-025636
• OSTI ID: 4014387
• Report Number(s): GEAP-3575
• Country of Publication: United States
• Language: English

Related Subjects

ANALOG SYSTEMS
COMPUTERS
DISTRIBUTION
EQUATIONS
FLUID FLOW
FREQUENCY
MOTION
NEUTRON FLUX
OPERATION
REACTOR CORE
REACTOR TECHNOLOGY
REACTORS
SHIPS
TRANSIENTS
VARIATIONS
VELOCITY
ZONES