Assessment of scale effects on vortexing, swirl, and inlet losses in large scale sump models. Containment sump reliability studies, generic task A-43. [PWR; BWR]
To verify the use of reduced scale hydraulic models of large scale ratios to demonstrate the performance of containment emergency sumps, in view of concerns regarding possible scale effects, a test program involving two geometric scale models (1:2 and 1:4) of a full size sump (1:1) was undertaken as a part of the total test program towards the resolution of unresolved safety issue A-43, Containment Emergency Sump Performance. The test results substantiated that hydraulic models with large scales such as 1:2 to 1:4 reliably predicted the sump hydraulic performance; namely, vortexing, air-ingestion from free surface vortices, pipe flow swirl and inlet loss coefficient. No scale effects on vortexing or air-withdrawals were apparent within the tested prediction range for both models. However, a good prediction of pipe flow swirl and inlet loss coefficient was found to require that the approach flow Reynolds number and pipe Reynolds number be above certain limits.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Worcester Polytechnic Inst., Holden, MA (USA). Alden Research Lab.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5235399
- Report Number(s):
- NUREG/CR-2760; ARL-48-82; SAND-82-7063; ON: DE82019208; TRN: 82-016034
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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