RAMI analyses of the IFMIF accelerator facility and first availability allocation between systems

Bargalló, Enric; Martínez, Gonzalo Serrano; Alguacil, Natalia; Abal, Javier; Beauvais, P.-Y.; Orsini, F.; Gobin, R.; Weber, M.; Podadera, I.; Regidor, David; Calvo, J.; Giralt, A.; Dies, J.; Tapia, Carlos; Hoyo, Alfredo de Blas del; Ibarra, Á.; Mollá, J.

doi:10.1016/j.fusengdes.2012.11.014

Cited by 10 publications

(7 citation statements)

References 5 publications

(4 reference statements)

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“…An iterative process was followed to match IFMIF design and availability studies [1,2]. These iterations made it possible to include recommendations and design change proposals coming from the RAMI analyses into the accelerator reference design.…”

Section: Ifmif Rami Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Results of the RAMI analyses performed for the IFMIF accelerator facility in the engineering design phase

Bargalló

Alguacil²,

Abal

et al. 2015

Fusion Engineering and Design

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This paper presents a summary of the RAMI (Reliability Availability Maintainability Inspectability) analyses done for the IFMIF (International Fusion Materials Irradiation Facility) Accelerator facility in the Engineering Design Phase. The methodology followed, the analyses performed, the results obtained and the conclusions drawn are described. Moreover, the consequences of the incorporation of the RAMI studies in the IFMIF design are presented and the main outcomes of these analyses are shown.

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Section: Ifmif Rami Analysesmentioning

confidence: 99%

“…The hardware availability requirement was fixed considering a beam degradation of only 2%, and then assuming that the mean intensity would be 98% of the nominal intensity [4]. As this degradation cannot be calculated with RiskSpectrum, an estimation was made based on the reliability results [5].…”

Section: Probabilistic Analysesmentioning

confidence: 99%

Results of the RAMI analyses performed for the IFMIF accelerator facility in the engineering design phase

Bargalló

Alguacil²,

Abal

et al. 2015

Fusion Engineering and Design

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“…RAMI analysis has been performed for some relevant systems of fusion reactors, such as RAMI analysis for ITER fuel cycle system [4], RAMI analysis for ITER Control Data Access and Communication (CODAC) functions [5] and RAMI analysis for DEMO HCPB blanket concept cooling system [6]. Bargallo E performed RAMI analyses for the IFMIF accelerator facility and first availability allocation between systems [7]. Maisonnier D summarized the RAMI analysis in ITER and DEMO and recommended adopting a reliability growth program for future fusion devices [8].…”

Section: Introductionmentioning

confidence: 99%

A New Reliability Allocation Method Based on PSA and AHP for Fusion Reactors

Sun

et al. 2022

Energies

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Reasonable and feasible reliability index allocation is significant for improving safety and reducing costs for fusion reactors. Although the reliability index is allocated when designing some key systems, reliability allocation is not implemented from the overall layer to the system and component layers for fusion reactors. In this contribution, fusion reactors are divided into different layers by applying the Analytic Hierarchy Process (AHP); these layers include the overall layer, system layer and component layer, failure mode layer, etc. Combining the Probabilistic Safety Assessment (PSA) model for fusion reactors and AHP, the reliability index is allocated from the overall layer to the system and component layer. Firstly, a new reliability index allocation method based on PSA and AHP for fusion reactors is proposed. Secondly, the PSA model for an in-vessel LOCA accident of fusion reactors is selected as a case study to demonstrate the applications of the proposed method. Lastly, the relationship between PSA, items safety classification and reliability allocation are discussed. The allocation results indicate that the proposed method provides a more systematic reliability allocation scheme and contributes to improving the safety and economy of fusion reactors.

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“…In the first iteration [76], the methodology to be used for the analysis was presented. Initial assumptions were explained, and initial results were shown.…”

Section: Iterative Processmentioning

confidence: 99%

“…In the second iteration [77], a new availability calculation was proposed in order to allow a complete availability analysis, considering all factors that may contribute to unavailability. Beam trips were considered, and beam degradations calculations were proposed.…”

Section: Iterative Processmentioning

confidence: 99%

IFMIF accelerator facility RAMI analyses in the engineering design phase

Bargalló Font

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The planned International Fusion Materials Irradiation Facility (IFMIF) has the mission to test and qualify materials for future fusion reactors. IFMIF will employ the deuteron-lithium stripping reaction to irradiate the test samples with a high-energy neutron flux. IFMIF will consist mainly of two linear deuteron accelerators, a liquid lithium loop and a test cell. Accelerated deuterons will collide with the lithium producing a high-energy neutron flux that will irradiate the material samples in the test cell. A timely and relevant fusion neutron source is essential in the path towards DEMO and future fusion power plants. For this reason, IFMIF is required to have high availability to obtain a fusion materials database to find suitable materials for DEMO design within the anticipated timeline. RAMI (Reliability Availability Maintainability Inspectability) analyses are being performed in the very early stages of design to meet such requirements. The IFMIF accelerator facility is composed of two independent linear accelerators, each of which produces a 40 MeV, 125 mA deuteron beam in a continuous wave mode at 175 MHz. These beam characteristics pose several unprecedented challenges: the highest beam intensity, the highest space charge, the highest beam power and the longest RFQ (Radio Frequency Quadrupole). As a result of these challenges, many design characteristics are counter to high-availability performance: the design is reluctant to accept failures, machine protection systems are likely to stop the beam undesirably, cryogenic components require long periods for maintenance, and activation of components complicates maintenance activities. These design difficulties, together with the high availability requirements and the demanding scheduled operational periods, make RAMI analysis an essential tool in the engineering design phase. These studies were performed in collaboration with system designers, enabling the creation of RAMI models that reflect current accelerator design. This feedback has been of the utmost importance to propose plausible design modifications in order to improve the availability performance of the machine. Parallel activity on the design and construction of the Linear IFMIF Prototype Accelerator (LIPAc) provided the detailed design information needed to conduct these studies properly. An iterative process was followed to match IFMIF design and availability studies. These iterations made it possible to include recommendations and design change proposals coming from the RAMI analyses into the accelerator reference design. Iterations consist of gathering information from the design, creating or updating the RAMI models, obtaining and analyzing results, and proposing ways to improve the design. Three different approaches were carried out in the iterative process. First, a comparison with other similar facilities was performed. Second, an individual fault tree analysis was developed for each system of the accelerator. Finally, a Monte Carlo simulation was performed for the whole accelerator facility considering synergies between systems. These approaches make it possible to go from detailed hardware availability analyses to global accelerator performance, to identify weak design points, and to propose design alternatives as well as foresee IFMIF performance, maintenance and operation characteristics. The IFMIF accelerator facility design was analyzed from the RAMI point of view, estimating its future availability and guiding the design towards a high reliability and availability performance. In order to achieve the high-availability requirements several design changes have already been included in the accelerator reference design whereas other important design modifications have been proposed and will be further analyzed in future design phases.

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RAMI analyses of the IFMIF accelerator facility and first availability allocation between systems

Cited by 10 publications

References 5 publications

Results of the RAMI analyses performed for the IFMIF accelerator facility in the engineering design phase

Results of the RAMI analyses performed for the IFMIF accelerator facility in the engineering design phase

A New Reliability Allocation Method Based on PSA and AHP for Fusion Reactors

IFMIF accelerator facility RAMI analyses in the engineering design phase

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