The impact of HEU to LEU conversion of commercial MNSR: Determination of neutron spectrum parameters in irradiation channels of NIRR-1 using MCNP code

Jonah, S.A.; Ibrahim, Y.V.; Ajuji, A.S.; Onimisi, MY

doi:10.1016/j.anucene.2011.08.026

Cited by 11 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The irradiation facility used for this study is the Nigeria Research Reactor-1 (NIRR-1) at the Centre for Energy Research and Training, Ahmadu Bello University, (CERT, ABU), Zaria which is a Miniature Neutron Source Reactor (MNSR) facility, specifically designed for neutron activation analysis (NAA) and commissioned for operation in February 2004. The detailed description of the reactor and the irradiation facility as well as the theory, methodology, among other of INAA have been well documented (Jonah et al, 2004;Jonah et al, 2005Jonah et al, 2006Jonah et al, 2012;Adeleye et al, 2012;Njinga et al, 2012;Joseph et al, 2011;Joseph et al, 2013;Joseph et al, 2015a;Joseph et al, 2015b;Joseph et al, 2017;Joseph et al, 2019;Abubakar & Joseph, 2023). The Radioactivity Measurements Device is a gamma-ray data acquisition system which consists of a horizontal dip-stick High-Purity Germanium (HPGe) detector with a relative efficiency of 10 % at 1332.5 keV gamma-ray line, the MAESTRO emulation software compatible with the ADCAM ® multi-channel analyzer (MCA) card, associated with electronic modules all made by EG & G ORTEC and a personal computer whose details has been described by Jonah et al (2006) and later by Joseph & Nasiru (2013).…”

Section: Sampling and Sample Preparationmentioning

confidence: 99%

Uranium and Thorium contaminations of Baobab leave powder consumed in selected locations of Katsina State, North West Nigeria

Joseph,

Lawal,

Ubaidullah

et al. 2024

jobasr

View full text Add to dashboard Cite

The need to know the level of contamination of radioactive elements, especially uranium and thorium, in the common foods we eat particularly the Baobab leave powder is highly significant due to their detrimental health effects. The presence of uranium and thorium in significant concentrations also presents an exposure risk to populations. In this study, six (6) baobab samples were collected from Daura, Funtua, Dustin-Ma, Kankia, Katsina, and Malumfashi in Katsina State. The samples were analysed for uranium and thorium content using Instrumental Neutron Activation Analysis (INAA). Concentration level of uranium was detected to be (0.068±0.011 mg/kg) in Daura and (0.021 mg/kg) in Dustin-Ma, while in Funtua, Kankiya, Katsina and Malumfashi, the concentrations were below detection limit. Thorium concentration was equally found to be (0.66±0.07 mg/kg) in Malumfashi, (0.54±0.07 mg/kg) in Daura, (0.43±0.06 mg/kg) in Dutsin-Ma, (0.25±0.04 mg/kg) in Kankia and (0.33±0.05 mg/kg) in Funtua. The concentration level of uranium and thorium accumulated in the baobab leave when analysed was found to be far below joint ATSDR/NIH safe limit of Uranium and Thorium intake in the human body. From this present work, we can see that the Baobab leave powder is safe for human consumption even though care should be taken to avoid contaminations

show abstract

Section: Sampling and Sample Preparationmentioning

confidence: 99%

Uranium and Thorium contaminations of Baobab leave powder consumed in selected locations of Katsina State, North West Nigeria

Joseph,

Lawal,

Ubaidullah

et al. 2024

jobasr

View full text Add to dashboard Cite

show abstract

“…These parameters are directly related to the reactor's control rod insertion and reactivity. Any deviation noted in the solutions of point kinetic parameters is a result of the sudden change in flux shape (Jonah et al, 2012;Azande, 2011, Ibrahim, 2015. Similarly, when the neutron source transient trip data was over predicted for negative insertion, it would lead to wrong results in point kinetic parameters (Bergenas and Scheinman, 2008;Azande et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Serpent Code Point Kinetic Parameters Analysis: A Nexus for Nigeria Research Reactor – 1 Core Conversion Using Enriched Uranium Dioxide Fuel

Abubakar¹,

Ismaila²,

Yamusa³

2022

FJS

View full text Add to dashboard Cite

The International Atomic Energy Agency (IAEA) requires that all test and research reactors operating on Higher Enriched Uranium (HEU) should be converted to Low Enriched Uranium (LEU) for safety and security purposes. Nigeria having a Miniature Neutron Source Reactor (MNSR) has been long interested in fuel technological research not just to develop the area but also to meet with resolution on the nuclear treaty set out by the global nuclear regulatory body. In this study, reactor kinetic parameters such as effective delayed neutron fractions, prompt neutron lifetime as well as mean neutron generation time were analysed for Nigerian Research Reactor-1 (NIRR-1). Serpent Monte Carlo code 1.17 is used in the analysis. For delayed neutron parameters determination, we used fission probability iteration under one averaged generation time and neutron population rate.The calculated values for delayed neutron were recorded as analogue prompt and implicit prompt neutron lifetime, reproduction time and emission time are in the order of 3×10-7 (s), in agreement with the calculated data from the nuclear data libraries and some literature.The result for delay neutron fraction and other time-based parameters support the fuel core conversion for NIRR-1.The computational and pictorial results obtained from Serpent code simulation described well the transient behavior of the delayed neutron in this reactor.The analytical results also spelled out the relevance and compatibility of low enriched uranium dioxide fuel over higher enriched type.The result of this study conforms with other results obtained from similar reactors but with different Monte Carlo codes and with higher enriched uranium

show abstract

“…The Nigeria Research Reactor-1 (NIRR-1) is one of the few reactors in the world with a core that allows conversion from Highly Enriched Uranium (HEU) to Low Enriched Uranium (LEU) fuel. A number of feasibility studies have been carried out for this reactor to investigate the possibility of using 12.5% UO 2 material to convert the NIRR-1 core from HEU to LEU fuel [5][6][7][8]. The results of these studies based on various nuclear analysis tools (such as MCNP, CITATION and VENTURE-PC), has shown that there will be a slight reduction in the thermal neutron flux in the core of NIRR-1.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of 19.75% UO2 Fuel for the Core Conversion of Nigeria Research Reactor-1 (NIRR-1) from HEU to LEU

Samson

Onimisi

Salawu

et al. 2016

PSIJ

View full text Add to dashboard Cite

SCALE 6.1 code system and VENTURE-PC code system has been used for the core conversion of Miniature Neutron Source Reactor (MNSR) from Highly Enriched Uranium (HEU) system (90.2% enriched UAl 4 fuel) to Low Enriched Uranium (LEU) system (19.75% enriched UO 2 -zircaloy-4 fuel). All other structure materials and dimensions of HEU and LEU cores are the same except the increase in the fuel cell diameters for the proposed LEU core. Results obtained show that the peak power density of 4.310033 Watts/cc, maximum neutron density of 6.94535e-6 n/cc, total control rod worth of ሺ723 േ 0.049ሻ pcm, clean cold core excess reactivity of ሺ404 േ 0.009ሻ pcm, k ୣ of ሺ1.0119634 േ 0.0072434ሻ , shutdown margin of ሺ319 േ 0.1003ሻ pcm and neutron flux profile of ሺ1.24 ൈ 10 ଵଶ േ 0.11ሻ ncm ିଶ s ିଵ for the potential LEU core are slightly greater than those of the

show abstract

The impact of HEU to LEU conversion of commercial MNSR: Determination of neutron spectrum parameters in irradiation channels of NIRR-1 using MCNP code

Cited by 11 publications

References 5 publications

Uranium and Thorium contaminations of Baobab leave powder consumed in selected locations of Katsina State, North West Nigeria

Uranium and Thorium contaminations of Baobab leave powder consumed in selected locations of Katsina State, North West Nigeria

Serpent Code Point Kinetic Parameters Analysis: A Nexus for Nigeria Research Reactor – 1 Core Conversion Using Enriched Uranium Dioxide Fuel

Computational Study of 19.75% UO2 Fuel for the Core Conversion of Nigeria Research Reactor-1 (NIRR-1) from HEU to LEU

Contact Info

Product

Resources

About