Improvement and optimization of techniques for monitoring erosion-corrosion wear of equipment and pipelines at nuclear power stations

Lovchev, V. N.; Gutsev, D. F.; Tomarov, G. V.; Shipkov, A. A.

doi:10.1134/s0040601509020086

Cited by 9 publications

(3 citation statements)

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“…V. N. Lovchev et al [152] made a detailed thorough research about various improvements and optimization techniques for monitoring erosion corrosion where they stated that the main focus for implementing the Comprehensive Program is to find solutions to provide optimum safety to nuclear power systems (NPSs) that encounter sudden failure of their components and equipment. The Comprehensive Program ensured the following advantages towards monitoring:…”

Section: Using Ramek Code As An Online Monitoring Approachmentioning

confidence: 99%

Framework for Structural Online Health Monitoring of Aging and Degradation of Secondary Systems due to some Aspects of Erosion

Gribok¹,

Patnaik²,

Williams³

et al. 2016

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This report describes the current state of research related to critical aspects of erosion and selected aspects of degradation of secondary components in nuclear power plants (NPPs). The report also proposes a framework for online health monitoring of aging and degradation of secondary components. The framework consists of an integrated multi-sensor modality system, which can be used to monitor different piping configurations under different degradation conditions. The report analyses the currently known degradation mechanisms and available predictive models. Based on this analysis, the structural health monitoring framework is proposed. The Light Water Reactor Sustainability Program began to evaluate technologies that could be used to perform online monitoring of piping and other secondary system structural components in commercial NPPs. These online monitoring systems have the potential to identify when a more-detailed inspection is needed using real-time measurements, rather than at a predetermined inspection interval. This transition to condition-based, risk-informed automated maintenance will contribute to a significant reduction of operations and maintenance costs that account for the majority of nuclear power generation costs. There is unanimous agreement between industry experts and academic researchers that identifying and prioritizing inspection locations in secondary piping systems (for example, in raw water piping or diesel piping) would eliminate many excessive in-service inspections. The proposed structural health monitoring framework takes aim at answering this challenge by combining long-range guided wave technologies with other monitoring techniques, which can significantly increase the inspection length and pinpoint the locations that degraded the most. More widely, the report suggests research efforts aimed at developing, validating, and deploying online corrosion monitoring techniques for complex geometries, which are pervasive in NPPs.

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Section: Using Ramek Code As An Online Monitoring Approachmentioning

confidence: 99%

Framework for Structural Online Health Monitoring of Aging and Degradation of Secondary Systems due to some Aspects of Erosion

Gribok¹,

Patnaik²,

Williams³

et al. 2016

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“…Since 2007, the OAO Rosenergoatom Concern has been implementing a comprehensive program on the problem concerned with erosion-corrosion of the main metal of pipelines and equipment at Russian NPSs [2]. At present, sufficient grounds have ripen for drawing up a new version of this ongoing comprehen sive departmental program on the problem of damages inflicted to welded connections.…”

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confidence: 99%

“…In 2002, the Electric Power Research Institute (the United States) published a report addressed to selective erosion-corrosion effect on welded connections. Since 2001, EDF has given the status of an individual problem to the wear of welded connections in a program on erosion-corro sion of the metal in NPS power units [1].Since 2007, the OAO Rosenergoatom Concern has been implementing a comprehensive program on the problem concerned with erosion-corrosion of the main metal of pipelines and equipment at Russian NPSs [2]. At present, sufficient grounds have ripen for drawing up a new version of this ongoing comprehen sive departmental program on the problem of damages inflicted to welded connections.…”

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confidence: 99%

Problems concerned with local erosion-corrosion of welded connections in the pipelines of a power unit at a nuclear power station

Tomarov¹,

Lovchev

Gutsev

et al. 2012

Therm. Eng.

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628During the last decades, systematic and pro grammed works have been carried out in leading coun tries around the world for collecting and analyzing data on erosion-corrosion damages inflicted to the metal of equipment and pipelines at nuclear power stations (NPSs), studying the regularities pertinent to the mechanism of erosion-corrosion, developing software tools for estimating and predicting the ero sion-corrosion process, and optimizing measures for monitoring, revealing, and preventing erosion-corro sion thinning of the walls of power equipment and pipelines. In France, for example, works have been carried out for more than 15 years on revealing ele ments belonging to the risk group of intense wear and optimizing the operational monitoring (thickness measurements) of metal thinning in 58 power units at NPSs belonging to the EDF Company with the use of the BRT CICERO computation code [1]. The EDF database has been created using the results of these works, which included 99 534 elements, i.e., around 2000 elements per power unit as of April 2010. As the time for which NPPs have been in operation passed, cases involving inadmissible thinning and fail ures of the metal in welded connections are observed in more and more frequent occasions along with ero sion-corrosion failures of the main metal of pipeline and equipment elements. In 2002, the Electric Power Research Institute (the United States) published a report addressed to selective erosion-corrosion effect on welded connections. Since 2001, EDF has given the status of an individual problem to the wear of welded connections in a program on erosion-corro sion of the metal in NPS power units [1].Since 2007, the OAO Rosenergoatom Concern has been implementing a comprehensive program on the problem concerned with erosion-corrosion of the main metal of pipelines and equipment at Russian NPSs [2]. At present, sufficient grounds have ripen for drawing up a new version of this ongoing comprehen sive departmental program on the problem of damages inflicted to welded connections. The data on damage ability and the results from operational checks of metal that have been acquired and analyzed with due regard of the requirements specified in the above mentioned program made it possible to reveal numerous cases involving the occurrence of inadmissible thinning in welded connections and in near weld zones of NPS pipelines. Cases are also known in which loss of tight ness occurred in welded connections of NPS process loops as a result of their erosion-corrosion thinning.Such incident occurred in November 2004 in a power unit of the Balakovo NPS, at which a leak was found in the zone of welding the bypass pipeline bend (D nom = 108 × 6 mm) to a sleeve (D nom = 120 × 16 mm) of the feedwater pipeline (D nom = 426 × 24 mm). The working parameters of medium in the damaged part are 220°C and 8.0 MPa.Significant inadmissibly thinned places in welded connections of pipelines downstream of the feedwater control valves are observed in power units of Russian NPSs equipped with diffe...

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Operative management of activities on monitoring the erosion-corrosion state of elements used in the condensate-feedwater path of a nuclear power station

Tomarov¹,

Usanov

Kanyshev³

et al. 2010

Therm. Eng.

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Improvement and optimization of techniques for monitoring erosion-corrosion wear of equipment and pipelines at nuclear power stations

Cited by 9 publications

References 0 publications

Framework for Structural Online Health Monitoring of Aging and Degradation of Secondary Systems due to some Aspects of Erosion

Framework for Structural Online Health Monitoring of Aging and Degradation of Secondary Systems due to some Aspects of Erosion

Problems concerned with local erosion-corrosion of welded connections in the pipelines of a power unit at a nuclear power station

Operative management of activities on monitoring the erosion-corrosion state of elements used in the condensate-feedwater path of a nuclear power station

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