Measurement of reactivity in a source driven deep sub-critical system using neutron noise methods

Kumar, Rajeev; Degweker, S.B.; Roy, Tushar; Singh, Kanchhi; Samanta, Sudipta; Bajpai, Shefali; Ray, Nirmal; Ali, Manjoor; Patel, Tarun; Shukla, Mayank; Sinha, Alok

doi:10.1016/j.anucene.2017.01.017

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…The measured prompt neutron decay constant using V/M and ACV are close to the theoretical estimate (2.310±0.058 ms -1 ) for 8DETR2 configuration whereas, the measured α is significantly higher compared to the theoretical estimate for 4DETR2. Therefore, the modal contamination is less in case of 8DETR2 configuration, which cancels out the 1 st symmetric mode and all anti-symmetric modes during measurements [4]. In the next step, noise experiments have been carried out using PNG.…”

Section: Resultsmentioning

confidence: 99%

“…The detectors' response will have contribution from fundamental and higher modes. So, detectors have been placed at designated fuel channels (B7, L7, G2 and G12, namely 8DETR2) at Z=±18.5 cm along axial direction based on the system modal analysis [4] and shown in figure 1(b, c). This symmetric arrangement cancels out the 1 st symmetric mode and all anti-symmetric modes during noise experiments.…”

Section: Icenes-2019mentioning

confidence: 99%

“…Noise experiments using isotopic neutron source which is Poisson in character have been carried out in different experimental facilities [4,5,6]. Various theoretical developments have also been carried out for pulsed and continuous neutron source under consideration of Poisson source characteristics [7,8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The modal contamination can be eliminated by placing detectors at locations based on system modal analysis [23]. Based on the theoretical postulate of mode cancellation [23], Kumar et al [4] have discussed the fundamental, and higher symmetric modes in BRAHMMA subcritical system using in house developed diffusion theory based code KINFIN [24].…”

Section: Introductionmentioning

confidence: 99%

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Noise experiments in BRAHMMA subcritical system using isotopic Poisson source and accelerator based neutron source

Ray

Kumar

Patel

et al. 2022

J. Phys.: Conf. Ser.

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Reactivity measurement using noise methods have been carried out in zero power subcritical system BRAHMMA, installed in BARC, India. During noise experiments, an Am-Be neutron source (1Ci) has been placed at the centre of the subcritical system. However, the proposed external neutron source in ADS, based on particle accelerator, is different from isotopic neutron source and the inherent fluctuations in beam current and accelerating voltage makes the source non-Poisson. In this context, Degweker and Rana had postulated a noise theory based on exponentially correlated Gaussian source characteristics for ADS. In noise experiments based on this postulate, a D-T neutron generator has been used in pulsed mode and source characterisation has been carried out to determine the distribution function, source correlation factor and D+ beam pulse shape. It has been observed that the source is Gaussian in nature, the source correlation factor is very large compared to the prompt neutron decay constant and the pulsed D+ beam is rectangular in shape. In noise experiments, the time stamped data have been analysed using various noise methods. The measured prompt neutron decay constant using Poisson source and correlated Gaussian source are in good agreement with theoretical value and amongst them.

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Section: Resultsmentioning

confidence: 99%

Section: Icenes-2019mentioning

confidence: 99%