Integral measurements of the effective delayed neutron fractions in the fast critical assembly SNEAK

Journal Article · Sat Jan 01 04:00:00 EST 1977 · Nucl. Sci. Eng.; (United States)

DOI:https://doi.org/10.13182/NSE77-4· OSTI ID:7128955

Fischer, E A

Integral measurements of delayed neutron fractions in fast reactor spectra by two different techniques were carried out. The worth of a calibrated /sup 252/Cf spontaneous fission source, together with absolute fission rates and with the normalization integral obtained from fission rate mapping, gives experimental values for the effective delayed neutron fraction of a critical assembly. These measurements were performed in three PuO/sub 2/--UO/sub 2/ fueled assemblies and in one UO/sub 2/ fueled assembly. The pile oscillator technique was used to determine relative yields of delayed neutrons from /sup 235/U, /sup 238/U, and /sup 239/Pu. The results confirm the evaluated yields by Tuttle, with a slight bias toward a higher /sup 239/Pu yield. With these data, the central worth discrepancy disappears for SNEAK measurements.

• Research Organization: Kernforschungszentrum, Karlsruhe, Ger.
• OSTI ID: 7128955
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 62:1; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
220600* -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
AIR COOLED REACTORS
DELAYED NEUTRON FRACTION
EPITHERMAL REACTORS
EXPERIMENTAL REACTORS
FAST REACTORS
GAS COOLED REACTORS
KINETICS
PILE OSCILLATION TECHNIQUES
REACTIVITY WORTHS
REACTOR KINETICS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SNEAK REACTOR
ZERO POWER REACTORS