The Delayed-Neutron Fraction—Neutron Lifetime Ratio in a TRIGA Reactor from Noise Analysis

Bärs, Bruno

doi:10.13182/nse67-a17247

Cited by 3 publications

(1 citation statement)

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“…Higher delayed neutron fraction means more neutrons resulting after fission occurs -mainly from the decay of fission products -and will affect the reactor's dynamic during operation. The prompt neutron lifetime of the TRIGA 2000 after modification was 2.0551×10 -4 s. This means that the lifespan of the prompt neutrons in the reactor was 2.0551×10 -4 s. The TRIGA Mark II reactor has a prompt neutron lifetime of 6.0×10 -5 s [25].…”

Section: Kinetic Parametermentioning

confidence: 94%

Neutronic Parameter Analysis of Plate-Type Fueled TRIGA 2000 Reactor by MCNPX

Nuryana,

Mahmudah,

Khakim

2023

Atom Indo.

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A novel simulation to calculate the neutronic parameters of the TRIGA 2000 reactor using plate-type fuel has been performed. The plate fuel used was produced by the Indonesian Nuclear Industry (PT INUKI) with U3Si2-Al material. Neutronic parameters based on INUKI’s plate-type fuel dimension and the current TRIGA’s configuration were simulated using MCNPX. The simulation was performed by modeling the complete reactor’s configuration on a fresh fuel core state. We obtained the kinetic parameter values from the simulation, i.e., delayed neutron fraction of 8.11×10‑3, a prompt neutron lifetime of 2.0551×10‑4 s, and an average neutron generation time of 1.87×10‑4 s. The excess reactivity of the reactor was 9.02 %Δk/k, while reactivity in the one-stuck-rod state was below ‑0.5 $ with an average value of ‑3.40 %Δk/k (‑4.19 $). The average thermal neutron flux peak occurred at the central irradiation position with the value of 3.0×1013 to 3.1×1013 n/(cm2 s). The reactor has a power peaking factor of 1.379 in the control rod position of 0 % on D3 fuel. The reactor had a negative feedback reactivity coefficient, except for the moderator coefficient. These results suggest that the current configuration of plate-type fuel met the nuclear reactor neutronic safety standards.

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Section: Kinetic Parametermentioning

confidence: 94%