ISOTHERMAL TEMPERATURE EFFECTS IN THE ADVANCED TEST REACTOR CRITICAL EXPERIMENTS
Isothermal temperature effects were measured in an ATR Critical Experiment core containing two strips of borated mylar film on each plate, no neck draw rods, and control cylinders at an initial position of approximately 100 degrees. Two sets of measurements were made because the first set of data indicated uncertainties in both temperature and reactivity measurements. Both measuremerts indicated slightly positive temperature coefficients initially. The first measurement indicated a change of sign at higher temperatures, while the second indicated a slightly less positive effect at higher temperatures. An additional measurement of isothermal temperature effects was made in an ATRCE Core with no borated plastic in the fuel region. Core reactivity was held by two fully inserted safety rods in Lobe Positions 1 and 9, and an additional measurement was made with a third safety rod inserted in Lobe 5. A reactivity loss of 31.1 cents was obtained by increasing core temperature from 21.7 to 39.7 C with two safety rods inserted; a reactivity loss of approximately 87 cents was obtained by increasing core temperature to the same degree with the three safety rods fully inserted. (auth)
- Research Organization:
- Babcock and Wilcox Co. Critical Experiment Lab., Lynchburg, Va.
- NSA Number:
- NSA-17-004340
- OSTI ID:
- 4742638
- Report Number(s):
- TID-17271; ATRCE-102
- Country of Publication:
- United States
- Language:
- English
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