Quarterly progress report on Blowdown Heat Transfer Separate-Effects Program for January--March 1978. [PWR]

Technical Report · Fri Jun 30 00:00:00 EDT 1978

OSTI ID:7098315

Thomas, D G; Bohanan, R E; Clark, D L

The Thermal-Hydraulic Test Facility (THTF) has completed 24 powered rod blowdowns through Mar. 9, 1978. Of these blowdowns, 5 were completed with all 49 rods powered, 2 were completed with 2 inactive rods, and 13 were completed with 4 inactive rods. Initial system pressure was approximately 15.5 MPa (approximately 2250 psi), test section inlet temperature was approximately 559/sup 0/K (approximately 547/sup 0/F), and break area was equivalent to a 200 percent break with the total area usually split between inlet and outlet in the ratio 0.40 : 0.60. Heater rod power was 80, 100, or 122 kW/rod, and the test section outlet temperature was 607/sup 0/K (632/sup 0/F), 598/sup 0/K (617/sup 0/F), or 589/sup 0/K (600/sup 0/F). Mean time to CHF varied from 0.7 to 1.4 sec, with delayed CHF of approximately 2.5 sec occurring in the upper half of the bundle in some tests.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7098315
• Report Number(s): ORNL/NUREG/TM-205
• Country of Publication: United States
• Language: English

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