Substantiation of fac rate and service life estimation under operation control data

Baranenko, V. I.; Gulina, Ol’ga Mihajlovna; Salnikov, Nikolay N.; Murzina, Ol’ga Eduardovna

doi:10.26583/npe.2016.2.06

Cited by 4 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The corrosion rate is estimated based on inspection data as follows (Baranenko et al 2016(Baranenko et al , 2017:…”

Section: Estimation Of the Ecw Rate For Components Of Pipelines With Single-and Two-phase Media Based On Reinspection Data (Vver-440 Nppsmentioning

confidence: 99%

Influence of operating time on the corrosion in single-phase and two-phase media

Baranenko

Gulina

Salnikov

2021

NUCET

View full text Add to dashboard Cite

Modern foreign computer codes predict a linear growth in the pipeline wall thinning with time due to the process of flow-accelerated corrosion (FAC), i.e. erosion-corrosion wear (ECW). Linear time-thinning dependence and corrosion rate constancy are not however typical of the NPP piping operating conditions. And the associated excessive conservatism of the residual life estimates leads to increased economic costs of repeated inspections. In domestic software tools, EKI-02 and EKI-03, the influence of operating time are taken into account by introducing the respective coefficient into the Chexal-Horowitz model based on the yield of corrosion products into the coolant. The ECW intensity can be however reduced through improvements in operating conditions, preventive measures, improvements in water chemistry, etc., and the use of the dependences once obtained may turn out to be too conservative. Based on a large number of repeated measurements as well as on data from corrosion testers, it has been shown that the influence of time can be described by the function of a particular form, the coefficients of which differ for different units and component and subsystem types. This makes it possible to determine the ‘aging function’ based on inspection data, and then use it in a targeted way for particular components. It has been shown that such estimates are much less conservative.

show abstract

“…The corrosion rate is estimated based on inspection data as follows (Baranenko et al 2016(Baranenko et al , 2017:…”

Section: Estimation Of the Ecw Rate For Components Of Pipelines With Single-and Two-phase Media Based On Reinspection Data (Vver-440 Nppsmentioning

confidence: 99%

Influence of operating time on the corrosion in single-phase and two-phase media

Baranenko

Gulina

Salnikov

2021

NUCET

View full text Add to dashboard Cite

show abstract

“…The ECW rate of a component of equipment or a pipeline, calculated from the results of one-time control of wall thicknesses, contains many uncertainties (Baranenko et al 2016) that reduce the accuracy of estimates (Bridgeman and Shankar 1991;Lee et al 2003;Moolayil 2007Moolayil , 2008; Baranenko et al 2010). These factors include as follows:…”

Section: Introductionmentioning

confidence: 99%

“…There is a wide variety of methods for estimating the ECW characteristics, taking into account the above factors (Baranenko et al 2016(Baranenko et al , 2017, including the repeated control data (NSAC-202L-R4 2013).…”

Section: Introductionmentioning

confidence: 99%

Repeated measurements and quality of estimates in the analysis of NPP pipeline erosion-corrosion wear

Baranenko¹,

Gulina²,

Миронов³

et al. 2020

NUCET

View full text Add to dashboard Cite

The article presents a study carried out on carbon steel pipe components subjected to erosion-corrosion wear (ECW). Based on the repeated control data, the authors present the calculated ECW characteristics, i.e., the wall-thinning and rate. It is shown that such estimates contain great uncertainty due to corrosion products deposited on the pipeline inner surface and their migration during operation. In addition, with an increase in the operating time, for example, when the lifetime is extended, the difference between the forecast and the results of control becomes larger. This means that the error in the estimates of the residual lifetime also increases. The study is based on the data of wall thickness measurements of the feedwater pipeline (273×16 mm) and steam pipeline (465×16mm) of nuclear power plants with the VVER-440 reactors, for which a sufficient number of repeated measurements were performed over a large time interval. An analysis is made of the error in estimating the pipeline wall-thinning and ECW rate using Chexal-Horowitz Flow-Accelerated Corrosion (FAC) Model (EKI-02 and EKI-03 software tools). The estimate of the ECW rate according to the above forecast model differs from the estimate according to the current control data by no more than 12.5%, since the corrosion products deposited on the pipeline inner surface wall are leveled at a large time base. When calculating the wall-thinning, due to the obvious filtering of the control data, it is possible to achieve an acceptable accuracy of estimates, i.e., about 16% without upgrading the model.

show abstract

“…Обоснование методики расчета скорости ЭКИ для элементов трубопроводных сис тем АЭС, изготовленных из углеродистых сталей, требует качественного анализа данных контроля и учета значительного количества факторов [5]. Введение дополнительных коэффициентов, учитывающих технологию изготовления трубопроводов и влияние от ложений на значения исходной и минимальной толщин [4], приводит к существенному изменению оценок скорости ЭКИ и остаточного ресурса, что обеспечивает определен ную консервативность расчетов и дает резерв времени для проведения повторного контроля.…”

Section: Introductionunclassified

“…где S ном -номинальная толщина стенки; K 11 -коэффициент, учитывающий положитель ный допуск на толщину стенки при изготовлении трубопровода; K 12 -коэффициент, учитывающий вклад отложений продуктов коррозии в номинальную толщину стенки; K 2 -коэффициент, учитывающий вклад отложений продуктов коррозии при замере минимальной толщины стенки (S мин ); K без -коэффициент безопасности; Δτ 0 -длитель ность эксплуатации элемента до даты проведения контроля. Геометрические особенно сти таких элементов, как гибы и околошовные зоны [5,6], возможно, потребуют кор ректировки данной методики и учета фактической толщины этих элементов.…”

Section: Introductionunclassified

Flow-accelerated corrosion rate and residual life time estimation for the components of pipeline systems at nuclear power plants based on control data

Baranenko

Gulina

Salnikov

2017

YadEn

View full text Add to dashboard Cite

show abstract

Substantiation of fac rate and service life estimation under operation control data

Abstract: И з в е с т и я в у з о в • Я д е р н а я э н е р г е т и к а • № 2 • 2 0 1 6 55

Cited by 4 publications

References 0 publications

Influence of operating time on the corrosion in single-phase and two-phase media

Influence of operating time on the corrosion in single-phase and two-phase media

Repeated measurements and quality of estimates in the analysis of NPP pipeline erosion-corrosion wear

Flow-accelerated corrosion rate and residual life time estimation for the components of pipeline systems at nuclear power plants based on control data

Contact Info

Product

Resources

About