PWR CORE 2 MODEL STUDIES TO IMPROVE INLETPLENUM-CHAMBER MIXING
In the course of the PWR Core 2 study program, studies to improve mixing in the lower plenum were carried out using a quarter-scale air-flow model. By use of vanes to form a strong vortex in the lower plenum, excellent lower-plenum mixing was obtained with only slight increase in pressure drop. For the studies relating to a 9-ft core design, the model core was extended downward 4 1/2 in. below the Core I position. The flow baffle used for this configuration extended below the four inlets, with the result that considerable pressure loss occurred in the lower plenum. It was found that mixing could be greatly improved by use of deflectors to divert the inlet flow in a tangential direction. Data on lower- plenum mixing, core-flow distribution, thermal-shield-flow directions and velocities, flowbaffle orifice coefficients, and pressure losses were obtained for the 9-ft core configuration both with flow deflectors and without them. The flow deflectors greatly improved mixing at the expense of increased lowerplenum pressure loss. For the studies relating to a 7.5-ft core design, the core was extended downward 2 1/4 in. The flow baffle used for this core design extended to about the center line of the inlets, so that restriction of inlet flow was less than for the 9-ft core. Data for the basic configuration were obtained, following which many types of mixing devices were studied. Use of a vaned ring to produce a strong vortex in the lower plenum resulted in excellent mixing with only slight increase in pressure drop. A similar vaned ring was designed for the prototype by Westinghouse and incorporated in the quarter-scale model. Detailed studies of model performance proved this design satisfactory. (auth)
- Research Organization:
- Battelle Memorial Inst., Columbus, OH (United States)
- DOE Contract Number:
- W-7405-ENG-92
- NSA Number:
- NSA-13-015760
- OSTI ID:
- 4236870
- Report Number(s):
- BMI-1342
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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