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research-article

INVESTIGATIONS OF ROD POSITIONS FOR TREAT M8CAL ANALYSES

[+] Author and Article Information
Zachary Weems

University of Florida, 3230 Innovation Blvd, Room 1421, K8-34, Richland, WA 99354
weems1@ufl.edu

Sedat Goluoglu

University of Florida, 549 Gale Lemerand Dr, Gainesville, FL 32611-6400
goluoglu@mse.ufl.edu

Mark DeHart

Idaho National Laboratory, 2525 North Freemont St., Idaho Falls, ID 83415
mark.dehart@inl.gov

1Corresponding author.

ASME doi:10.1115/1.4038929 History: Received July 24, 2017; Revised December 07, 2017

Abstract

TREAT, a graphite moderated experimental reactor, is scheduled to restart in late 2017. There is now renewed interest in development of capabilities to model and simulate TREAT transients using three-dimensional coupled physics. To validate existing transient analysis tools as well as those under development, several temperature- limited transients have been modeled and analyzed. These transients are from the M8CAL experiment series, a set of experiments performed to calibrate the reactor detectors for the planned M8 series of fuel tests. Detailed reactor models were prepared that were than used to calculate the pre-transient and post-transient keff values as well as corresponding reactivity insertions. Alterations to modeled values of shutdown and initial transient rod insertion depths were made to better match the reported experimental values of reactivity insertions assuming just critical pre-transient states. It was found that two of the altered media inputs, fuel and Zircaloy-3 cladding, had significant effects on the keff. In addition, increasing shutdown rod insertion by 3 to 5 cm and decreasing initial transient rod insertion by 1 to 2 cm gave perfect pre-transient keff and total reactivity insertion values. However, the revised positions are as much as a factor of 3 to 20 different from reported uncertainty of 0.762cm. This suggests that boron concentration uncertainties may play a significant role in accurately modeling the TREAT transients and should be investigated thoroughly.

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