The Availability Analysis of Fusion Power Plants as Applied to MARS

Musicki, Z.; Maynard, C.W.

doi:10.13182/fst83-a22882

Cited by 8 publications

(2 citation statements)

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“…The frequencies of occurrence of Category 1 transients are taken from reference [1] for a pulsed machine. They are actually the results of two other studies: [7] and [8], which, although based on another tokamak machine and a Tandem Mirror Reactor in [8] as baseline, give reasonable estimates for similar components of ITER. For Category 2 transients, we perform a system analysis described in the following sections.…”

Section: Identification and Classification Of The Transient Eventssupporting

confidence: 70%

Probabilistic Analysis of Divertor Plate Lifetime in Tokamak Reactors

Golinescu

Kazimi

1994

Fusion Technology

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Probabilistic methods have been successfully used to analyze the risk associated with different existing nuclear power plant designs. Such tools can be also used at earlier stages in the design process. Defining a methodology for generation of the probabilistic lifetime reliability for a specific tokamak in-vessel component, the divertor, is the objective of this thesis. The divertor plates establish an interface between the plasma and the material surface of the tokamak device.The design of the divertor cooling system is a most demanding task since it endures the largest power density during operation. Even more severe consequences would appear under some transient conditions.In the present analysis, the divertor conditions for the technology phase of operation of the International Thermonuclear Experimental Reactor (ITER) as specified at the conceptual design stage are used as the reference design. The methodology developed to analyze the ITER divertor reliability consists of the following steps:1. description of normal operating conditions;2. thermal-hydraulic analysis for normal operation;3. identification and classification of transient events; 4. estimation of frequency of occurrence of transient events; 5. thermal analysis for transient event conditions; 6. defining the failure modes / failure criteria models; 7. assessment and propagation of uncertainties; 8. evaluation of the probability of avoiding failure of the divertor plate. The transient events considered in this work are grouped in two categories as follows:-transients that do not affect the divertor temperature distribution prior to shutdown, such as: auxiliary heating system disturbances, magnet system disturbances, main coolant disturbances, balance of plant disturbances, internal plasma disturbances; -transients that affect the divertor temperature distribution prior to shutdown, such as those on the coolant side: Loss of Coolant Accident (LOCA), Loss of Flow Accident (LOFA), and Loss of Heat Sink (LHS), and overpower (OP) transient on the plasma side. In applying this methodology, one failure mode is assumed to be the predominant failure mode: that of surface material loss due to sputtering, melting and evaporation. Taking no credit for redeposition of that material partially balances the fact that other failure modes are not accounted for. 2 The heat conduction computer code HEATING 7.2 is used for the steady-state and transient thermohydraulic analyses as well as for estimating the material loss during transients. The development of a reliability function requires defining a probability distribution function for the material loss during transients. A second order response surface (Response Surface Methodology) is derived for the material loss as a function of the uncertain parameters. The -uncertainties of the frequency of occurrence of transients and material loss parameters are propagated through the reliability function by a Monte Carlo simulation.Using the limited data available leads to the conclusion that there is a high prob...

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Section: Identification and Classification Of The Transient Eventssupporting

confidence: 70%

Probabilistic Analysis of Divertor Plate Lifetime in Tokamak Reactors

Golinescu

Kazimi

1994

Fusion Technology

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“…While these studies investigated mainly the safety features of magnets, the availability of magnet systems was included in a study by Musicki [Musicki 1983].…”

Section: Reliability Aspects In Fusion Randdmentioning

confidence: 99%

Failure modes and effects analysis of fusion magnet systems

Zimmermann¹,

Kazimi²,

Siu³

et al. 1988

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A failure modes and consequence analysis of fusion magnet system is an important contributor towards enhancing the design by improving the reliability and reducing the risk associated with the operation of magnet systems. In the first part of this study, a failure mode analysis of a superconductin magnet system is performed. Building on the functional breakdown and the fault tree analysis of the Toroidal Field (TF) coils of the Next European Torus (NET), several subsystem levels are added and an overview of potential sources of failures in a manet system is provided. The failure analysis is extended to the Poloidal Field PF) magnet system. Furthermore, an extensive analysis of interactions within the fusion device caused by the operation of the PF magnets is presented in the form of an Interaction Matrix. A number of these interactions may have significant consequences for the TF magnet system particularly interactions triggered by electrical failures in the PF magnet system. This report is based on the thesis submitted by the first author to the Department of Nuclear Engineering at MIT in partial fulfillment of the requirements for an M.S. degree. We are grateful for the many valuable discussions and the support of R.D. Pillsbury and W.R. Mann from the MIT Plasma Fusion Center during the modeling and simulation process. Furthermore, we would like to thank R. Binde from the NET Team, Garching, FRG, for his interest in this work and the valuable information about the NET program he provided throughout this study.

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The Organization and Collection of System’s Data in Fusion

Musicki

Maynard

1986

Reliability Data Collection and Use in Risk and Availability Assessment

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The Availability Analysis of Fusion Power Plants as Applied to MARS

Cited by 8 publications

References 0 publications

Probabilistic Analysis of Divertor Plate Lifetime in Tokamak Reactors

Probabilistic Analysis of Divertor Plate Lifetime in Tokamak Reactors

Failure modes and effects analysis of fusion magnet systems

The Organization and Collection of System’s Data in Fusion

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