Shutdown dose rate neutronics experiment during high performances DD operations at JET

Villari, R.; Batistoni, P.; Bradnam, S.C.; Colling, B.; Fischer, U.; Flammini, D.; Fonnesu, N.; Ghani, Z.; Klix, A.; Loreti, S.; Naish, J.; Packer, L.W.; Pillon, M.; Popovichev, S.; Stamatelatos, I. E.; Vasilopoulou, T.

doi:10.1016/j.fusengdes.2018.05.053

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The neutron transport simulations were performed with MCNP5 using the 45°geometrical models of octants 1 and 2 [30]. Material description includes impurities based on available chemical certificates and the reflective boundary condition on the lateral sides of the models is applied to simulate full 3D transport.…”

Section: Input Preparation and Some Preliminary Numerical Predictionsmentioning

confidence: 99%

Shutdown dose rate experiment at JET during DTE2

Fonnesu,

Loreti,

Villari

et al. 2024

Eur. Phys. J. Plus

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The EUROfusion activities on the technological exploitation of deuterium–tritium (DT) operation at JET (started within the work package JET3 and continued under PrIO) were established to maximize the scientific and technological return of DTE2 campaign occurred in the second part of 2021. In particular, the aim of the NEXP sub-project was to take advantage of the expected significant neutron production during DTE2 to validate the numerical tools used for neutron streaming and shutdown dose rate (SDR) calculation for ITER through the comparison between numerical predictions and measurements. In the frame of SDR activity, a dosimetry system to measure the dose rate and based on some ionization chambers (ICs) was installed in the torus hall and upgraded both hardware and software since 2015 by exploiting the previous DD and TT campaigns. Two spherical 1-L air-vented ICs had been installed in some ex-vessel positions close to the horizontal ports of the tokamak in octants 1 and 2 and a third IC, suitable for higher dose rates, was then added in octant 1. As for SDR calculation, numerical tools employed rely on MCNP code for radiation transport and in this regard the MCNP model has been updated to include the last detector installed in octant 1. The present work is dedicated to the analysis of dose rate measurements carried out during DTE2 in the inter-pulse periods and at the shutdown. Influence quantities and error sources are analyzed to calculate the dose rate from raw signal and experimental uncertainty. Some experimental points are chosen and employed for a preliminary comparison with numerical predictions obtained from three-dimensional simulations with Advanced D1S tool. The results are presented and discussed with the major objective to contribute to the optimization of the planned SDR code validation.

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Section: Input Preparation and Some Preliminary Numerical Predictionsmentioning

confidence: 99%

Shutdown dose rate experiment at JET during DTE2

Fonnesu,

Loreti,

Villari

et al. 2024

Eur. Phys. J. Plus

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“…In preparation for DTE2, a third IC suitable for higher dose rates was added in octant 1 for the second part of the 2020 D campaign [162]. Dose rate measurements from the three ICs will be compared to predictions by a number of code packages routinely used in ITER/DEMO design analyses, such as R2Smesh (KIT), MCR2S (CCFE), R2S (UNED) and ORNL-R2S (ORNL), based on the Rigorous Two-Step (R2S) approach, and Advanced D1S (ENEA) and D1SUNED (UNED) based on the direct one-step (D1S) approach (see [163] and references therein).…”

Section: Neutronics Experimentsmentioning

confidence: 99%

Overview of JET results for optimising ITER operation

et al. 2022

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The JET 2019-2020 scientific and technological programme exploited the results of years of concerted scientific and engineering work, including the ITER-like wall (ILW: Be wall and W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major Neutral Beam Injection (NBI) upgrade providing record power in 2019-2020, and tested the technical & procedural preparation for safe operation with tritium. Research along three complementary axes yielded a wealth of new results. Firstly, the JET plasma programme delivered scenarios suitable for high fusion power and alpha particle physics in the coming D-T campaign (DTE2), with record sustained neutron rates, as well as plasmas for clarifying the impact of isotope mass on plasma core, edge and plasma-wall interactions, and for ITER pre-fusion power operation. The efficacy of the newly installed Shattered Pellet Injector for mitigating disruption forces and runaway electrons was demonstrated. Secondly, research on the consequences of long-term exposure to JET-ILW plasma was completed, with emphasis on wall damage and fuel retention, and with analyses of wall materials and dust particles that will help validate assumptions and codes for design & operation of ITER and DEMO. Thirdly, the nuclear technology programme aiming to deliver maximum technological return from operations in D, T and D-T benefited from the highest D-D neutron yield in years, securing results for validating radiation transport and activation codes, and nuclear data for ITER.

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“…The experimental assembly and measurements analyses performed in the last 2016 DD benchmark are described in [11].…”

Section: Mcnp Inputmentioning

confidence: 99%

“…The code implementations of these methodologies [5][6][7][8][9][10] have been applied to analyse the results of the recent deuterium-deuterium (DD) JET campaign [11] under the JET3 project [12] in the frame of subproject NEXP 'streaming and SDR experiments' [1]. This analysis consists of comparing the SDR measured in the detectors located in the octant 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

Analysis of discrepancies between D1S and R2S results of 2016 DD JET Campaign

Alguacil¹,

Catalán²,

Sauvan³

et al. 2022

Nucl. Fusion

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In the frame of the WPJET3-DT Technology project within the EUROfusion Consortium program, neutronics experiments are being carried out in preparation for the current deuterium–tritium campaign on JET (DTE2). The experiments are conducted to validate the neutronics codes and tools used in ITER, thus reducing the related uncertainties and the associated risks in the machine operation. Recently, the shutdown dose rate (SDR) results of the 2016 DD campaign have been analyzed using the D1S and R2S computational methodologies showing relevant differences between the results provided by both methods. The greatest discrepancies, found in the SDR calculated in the second octant at 6 h after shutdown, are a factor 2 of difference in the total decay photon flux and a different peak location close to 0.511 MeV. This article presents a detailed analysis of the D1S and R2S simulations performed to find the causes of these discrepancies. The conclusions of the analysis determine that the use of the typical neutron and gamma energy structures used in common R2S simulations can tend to a photon flux significant overestimation or a shift in the output spectrum, respectively. In addition to alerting about this important problem in R2S calculations, this article also proposes a solution to mitigate each effect that can be implemented in R2S codes. The application of the proposed solutions significantly reduces the differences between the photon spectrum calculated with D1S and R2S methods.

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Shutdown dose rate neutronics experiment during high performances DD operations at JET

Cited by 7 publications

References 12 publications

Shutdown dose rate experiment at JET during DTE2

Shutdown dose rate experiment at JET during DTE2

Overview of JET results for optimising ITER operation

Analysis of discrepancies between D1S and R2S results of 2016 DD JET Campaign

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