Since the dawn of the nuclear weapons era, political, military, and scientific leaders around the world have been working to contain the proliferation of Special Nuclear Material and explosively fissile material. This paper describes the construction of a prototype, directional, fast neutron detector, modeled after the Dark Matter Time Projection Chamber. Fast neutrons are emitted by a host of ...

Matrix exponential methods have long been utilized for isotopic depletion in nuclear fuel calculations. In this paper we discuss the development of such addition to species transport liquid fueled molten salt reactors (MSRs). Conventional work with fixed assemblies which fission products and fissile material do not throughout core. Liquid a much different way, allowing primary reactor loop. Bec...

The present work was started in the framework of the ENEA contribution to the Nuclear Energy Agency (NEA) Task Force on Physics Aspects of Trimsmutation. Taking into account the present interest in the hybrid systems technology. the paper was completed adding the initial developments concerning the systems devoted to flssile material production, together with the more recent developments regard...

In this paper, we present a neutron spectrum unfolding technique based on a modification of the least-squares method. The main innovation is the use of a Krylov subspace iteration method to solve the least-squares normal equations. This method was employed because it performs better on ill-conditioned systems of linear equations as compared with standard direct-solution methods. Three different...

In the frame of dependable neutron flux instrumentation development for Generation IV reactors, French Atomic and Alternative Energies Commission (CEA) investigates an innovative technology based on optical signal produced within a fission chamber. such gaseous detectors, neutrons interact with fissile material, releasing heavy ions in MeV range, eventually leading to spontaneous photons emissi...

The Feynman-alpha method is a neutron noise technique that used to estimate the prompt period of fissile assemblies. and quantity are widespread interest including in applications such as nuclear criticality safety, safeguards nonproliferation, stockpile stewardship; may also be infer keff multiplication factor. predicated on time-correlated detections deviate from Poisson random variable due m...