Experimental activity on the definition of acceptance criteria for the ITER divertor plasma facing components

Abstract This paper is focused on various aspects of the development and testing of water cooled divertor PFCs. Divertor PFCs are mainly designed to absorb the heat and particle fluxes outflowing from the core plasma of fusion devices like ITER. The Divertor and First Wall Technology Development Division at the Institute for Plasma Research (IPR), India, is extensively working on development and testing of divertor plasma facing components (PFCs). Tungsten and graphite macro-brush type test mock-ups were produced using vacuum brazing furnace technique and tungsten monoblock type of test mock-ups were obtained by hot radial pressing (HRP) technique. Heat transfer performance of the developed test mock-ups was tested using high heat flux tests with different heat load conditions as well as the surface temperature monitoring using transient infrared thermography technique. Recently we have established the High Heat Flux Test Facility (HHFTF) at IPR with an electron gun EH300V (M/s Von Ardenne Anlagentechnik GmbH, Germany) having maximum power 200 kW. Two tungsten monoblock type test mock-ups were probed using HHFTF. Both of the test mock-ups successfully sustained 316 thermal cycles during high heat flux (HHF) tests. The test mock-ups were non-destructively tested using infrared thermography before and after the HHF tests. In this note we describe the detailed procedure used for testing macro-brush and monoblock type test mock-ups using in-house transient infrared thermography set-up. An acceptance criteria limit was defined for small scale macro-brush type of mock-ups using DTrefmax value and the surface temperature measured during the HHF tests. It is concluded that the heat transfer behavior of a plasma facing component was checked by the HHF tests followed by transient IR thermography. The acceptance criteria DTrefmax limit for a graphite macro-brush mock-up was found to be ~3°C while for a tungsten macro-brush mock-up it was ~5°C.

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Exceptional Fatigue Performances for Umbilical’s Super Duplex Seam Welded Tube Solutions

Volume 1A: Offshore Technology ◽

10.1115/omae2014-23265 ◽

2014 ◽

Author(s):

Olivier Wagner ◽

Gilles Thevenet ◽

Jérôme Peultier ◽

Jean-Philippe Roques ◽

Henri Romazzotti

Keyword(s):

Fatigue Test ◽

Innovative Technology ◽

Internal Diameter ◽

Test Protocol ◽

Acceptance Criteria ◽

Welded Tube ◽

Weld Fatigue ◽

Extensive Program ◽

The Stability ◽

Definition Of

Since the last five years, an innovative technology for umbilical’s seam welded super duplex stainless steel tubes (grade 2507, UNS S32750) has been developed in order to meet new technical challenges. An extensive program of qualification, based on 4 dimensions covering the full manufacturing range, i.e. internal diameter and wall thickness, has been set. More than 11000 test results demonstrated the efficiency and the stability of the manufacturing process. The results were also confirming the expected properties of the tubes, in term of mechanical characteristics, corrosion resistance and manufacturing tolerances. At the end of this qualification phase, a Type Approval Certificate was delivered by an independent and official certifying authority demonstrating then, the suitability of the product for offshore static applications. The next step was to confirm the fatigue performance of the product to meet the requirements of umbilicals for dynamic applications. This paper describes how a dedicated fatigue test protocol has been jointly defined between a Major O&G player and the tube supplier. This protocol has been built in order to test the 3 dimensions already produced during the first step of the qualification, considering tube samples with and without orbital weld. Fatigue test programs are known to be very sensitive to the test parameters, i.e. temperature, test frequency and dimensional properties of the samples. As a consequence, special attention is paid to the description of the testing methodology, the selection of the acceptance criteria and the definition of the testing parameters. Finally, the results of this program are presented and discussed in order to assess the capability of the product with respect to the defined acceptance criteria.

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Manufacturing and testing of reference samples for the definition of acceptance criteria for the ITER divertor

Fusion Engineering and Design ◽

10.1016/j.fusengdes.2010.07.008 ◽

2010 ◽

Vol 85 (10-12) ◽

pp. 1986-1991 ◽

Cited By ~ 5

Author(s):

Eliseo Visca ◽

E. Cacciotti ◽

S. Libera ◽

A. Mancini ◽

A. Pizzuto ◽

...

Keyword(s):

Acceptance Criteria ◽

Definition Of ◽

Reference Samples

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Safety Format and Acceptance Criteria for Analysis of Marine Structures Using Non-Linear Methods

Volume 3: Materials Technology; Jan Vugts Symposium on Design Methodology of Offshore Structures; Jo Pinkster Symposium on Second Order Wave Drift Forces on Floating Structures; Johan Wichers Symposium on Mooring of Floating Structures in Waves ◽

10.1115/omae2011-49874 ◽

2011 ◽

Cited By ~ 1

Author(s):

Gunnar Solland ◽

Atle Johansen ◽

Gudfinnur Sigurdsson

Keyword(s):

Cross Sections ◽

Structural Integrity ◽

Linear Analysis ◽

Acceptance Criteria ◽

Existing Structures ◽

Analysis Methods ◽

Structural Details ◽

Non Linear ◽

Definition Of ◽

Novel Design

This paper deals with how structural integrity can be documented by use of non-linear analysis methods. The focus is on structures that are exposed to extreme environmental loads. In order to prove the structural integrity for aging offshore installation, non-linear analysis methods are finding increased applications. The codes ISO 19902, API RP 2A and Norsok N-006 give recommendations for use of non-linear methods for capacity checks of existing structures. This paper discusses the different safety formats given in these codes. Also presented is how practical acceptance criteria that have to be applied in conjunction with such analyses can be formulated. The topics that are dealt with are issues that the analyst performing such analyses needs to address like: definition of failure, representation of joints, issues on cyclic loading, instability of cross sections and member buckling. In cases of novel design solutions or special structural details, non-linear analysis methods may also find application when planning new structures.

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Reformulating the Second Law

Scientonomy Journal for the Science of Science ◽

10.33137/js.v1i0.27158 ◽

2017 ◽

Vol 1 ◽

pp. 29-39 ◽

Cited By ~ 1

Author(s):

Paul Patton ◽

Nicholas Overgaard ◽

Hakob Barseghyan

Keyword(s):

Second Law ◽

Causal Connection ◽

Acceptance Criteria ◽

Current Formulation ◽

Previous Formulation ◽

Previous Definition ◽

Assessment Outcomes ◽

Definition Of ◽

New Formulation ◽

Theory Acceptance

The current formulation of the second law is flawed since it does not specify the causal relations between the outcomes of theory assessment and the actual acceptance/unacceptance of a theory; it merely tells us that a theory was assessed by the method employed at the time. We propose a new formulation of the second law: “If a theory satisfies the acceptance criteria of the method actually employed at the time, then it becomes accepted into the mosaic; if it does not, it remains unaccepted; if it is inconclusive whether the theory satisfies the method, the theory can be accepted or not accepted.” This new formulation makes the causal connection between theory assessment outcomes and cases of theory acceptance/unacceptance explicit. Also, this new formulation is not a tautology because it forbids certain logically possible scenarios, such as a theory satisfying the method of the time yet remaining unaccepted. Finally, we outline what inferences an observational scientonomist can make regarding theory assessment outcomes from the record of accepted theories.Suggested Modifications[Sciento-2017-0004]:Accept the following reformulation of the second law:The second law: if a theory satisfies the acceptance criteria of the method employed at the time, it becomes accepted into the mosaic; if it does not, it remains unaccepted; if assessment is inconclusive, the theory can be accepted or not accepted.Accept the following definitions of theory assessment outcomes:Outcome: satisfied ≡ the theory is deemed to conclusively meet the requirements of the method employed at the time.Outcome: not satisfied ≡ the theory is deemed to conclusively not meet the requirements of the method employed at the time.Outcome: inconclusive ≡ it is unclear whether or not the requirements of the method employed at the time are met.Accept the following ontology of theory assessment outcomes:The three possible outcomes of theory assessment are “satisfied”, “not satisfied”, and “inconclusive”.Accept the following redefinition of employed method:Employed method ≡ a method is said to be employed if its requirements constitute the actual expectations of the community.Reject:The previous formulation of the second law.The previous definitions of theory assessment outcomes.The previous ontology of theory assessment outcomes.The previous definition of employed method. [Sciento-2017-0005]:Contingent upon the acceptance of the preceding modification [Sciento-2017-0004], accept that the new second law is not a tautology. [Sciento-2017-0006]:Contingent upon the acceptance of modification [Sciento-2017-0004], accept the following set of inferences of theory assessment outcomes from the acceptance or unacceptance of a single contender (see text).Also accept the following set of inferences of theory assessment outcomes from the acceptance or unacceptance of two contender theories (see text).

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FINAL QUALITY OF A SUSTAINABLE LANDFILL AND POST-CLOSURE MANAGEMENT

Detritus ◽

10.31025/2611-4135/2020.13999 ◽

2020 ◽

pp. 148-159

Author(s):

Valentina Grossule

Keyword(s):

Reference Values ◽

Environmental Sustainability ◽

Storage Quality ◽

Acceptance Criteria ◽

Limit Values ◽

Legal Limit ◽

Stability Indexes ◽

Definition Of

Landfill should be designed and constructed in line with the principle of environmental sustainability, guaranteeing over a period of less than one generation (typically considered 30 years) the environmental equilibrium of Final Storage Quality, when waste stability and immobilisation of contaminants is achieved and all active measures of control may be removed without posing any further risk to the environment. The practical definition of FSQ, when a landfill can be released from aftercare, and a procedure for the technical and administrative termination of the post-closure management phase are an evident regulatory strategic need to assure the design of sustainable landfill. The aim of this paper is to provide a criterion to define the FSQ of landfill, based on the control of the analytical emission parameters and of stability indexes related to the residual emission potential. These should concur with the law’s acceptance criteria for the landfilling of wastes (LAC), and with the legal limit values (LLV) established for the emission of contaminants into the environment. The interrelationship between, stability indexes (emission potential), analytical emission parameters, LAC and LLV is discussed and reference values are provided. Finally, the paper proposes a procedure for the termination of technical and administrative aspects following the post-closure management in accordance with FSQ.

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14C Release from Steels under El Cabril Standard Leaching Test

Radiocarbon ◽

10.1017/rdc.2018.82 ◽

2018 ◽

Vol 60 (6) ◽

pp. 1743-1756

Author(s):

José L Leganés ◽

José V Muñoz ◽

Carmen M García

Keyword(s):

Stainless Steel ◽

Radioactive Waste ◽

Gaseous Phase ◽

Leaching Tests ◽

Leaching Test ◽

Acceptance Criteria ◽

Retention Capacity ◽

Inorganic Species ◽

Different Types ◽

Definition Of

ABSTRACTThe study of the mechanisms of radiocarbon (14C) release from different types of radioactive waste in final disposal conditions (organic, inorganic species, liquid, or gaseous phase) is an important aspect for the definition of waste acceptance criteria in a repository. The goal of this work is to determine the behavior of activated stainless steel, under standard leaching tests performed at El Cabril laboratory, with the aim of determining the retention capacity of the activated stainless steel, and therefore to assess the treatment and the potential additional barriers necessary for the fulfillment of waste acceptance criteria relevant to the El Cabril surface repository, Spain.

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Introductory paper

Symposium - International Astronomical Union ◽

10.1017/s0074180900053031 ◽

1966 ◽

Vol 24 ◽

pp. 3-5

Author(s):

W. W. Morgan

Keyword(s):

Line Intensity ◽

Classification Scheme ◽

Two Dimensional ◽

Spectral Classification ◽

Dimensional Array ◽

Rr Lyrae ◽

Metallic Line ◽

Introductory Paper ◽

Parameter Varying ◽

Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

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2.2. Working Group 2: Conceptual Definitions of Reference Coordinate Systems for Earth Dynamics

International Astronomical Union Colloquium ◽

10.1017/s0252921100050867 ◽

1975 ◽

Vol 26 ◽

pp. 21-26

Keyword(s):

Coordinate System ◽

Working Group ◽

General Character ◽

Coordinate Systems ◽

Reference Coordinate System ◽

Group 2 ◽

Definition Of ◽

Earth Dynamics

An ideal definition of a reference coordinate system should meet the following general requirements:1. It should be as conceptually simple as possible, so its philosophy is well understood by the users.2. It should imply as few physical assumptions as possible. Wherever they are necessary, such assumptions should be of a very general character and, in particular, they should not be dependent upon astronomical and geophysical detailed theories.3. It should suggest a materialization that is dynamically stable and is accessible to observations with the required accuracy.

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