scholarly journals PERIODIC REACTOR PLANT LEAK RATE TEST. CORE 1, SEED 2. Test Results T- 641102. First Issue, JUNE 14, 1961

1961 ◽  
Author(s):  
Keyword(s):  
Leak Rate ◽  
Test Results ◽  
Reactor Plant ◽  
Rate Test

scholarly journals Comparison of Measured and Calculated Data for NPP Krško CILR Test

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2176
Author(s):  
Štefica Vlahović ◽  
Siniša Šadek ◽  
Davor Grgić ◽  
Tomislav Fancev ◽  
Vesna Benčik
Keyword(s):  
Nuclear Power ◽  
Calculated Data ◽  
Leakage Rate ◽  
Leak Rate ◽  
Measured Temperature ◽  
Test Results ◽  
Test Scenario ◽  
Weighting Factors ◽  
Containment Model ◽  
Rate Test

Containment is the last barrier for release of radioactive materials in the case of an accident in the nuclear power plant (NPP). Its overall integrity is tested during a containment integrated leak rate test (CILRT) at the design pressure, at regular intervals. Due to applied risk based licensing, the test intervals can be increased up to once in 10 years and beyond. Taking that into account it is important to prepare the test properly and to use obtained results to assess the real status of the containment. The test can be used to verify existing containment calculation models. There is a potential benefit of verified computer models usage for the explanation of some test results, too. NPP Krško has performed CILRT during the plant outage in 2016. The paper presents a comparison between measured data and results calculated using a multivolume GOTHIC (Generation Of Thermal Hydraulic Information For Containment) model. The test scenario was reproduced using limited available data up to the end of the pressurization phase. The depressurization phase is calculated by the code and measured leakage rate is implemented in the model. Taking into account the necessary adjustments in the model, overall prediction of the measured results (in terms of pressure, temperature and humidity) is very good. In the last phase of the test some non-physical behavior is noticed (without influence on overall test results), probably caused by the combination of air redistribution within the containment and influence of heat transfer to plant systems that were in the operation during the test. GOTHIC model was used to check sensitivity of the predicted pressure (leak rate) to different heat inputs and to investigate the influence that operation of only one reactor containment fan cooler (RCFC) train during pressurization can have on the mixing of air within the containment. In addition, the influence of currently used weighting factors (weighting of measured temperature, relative humidity and pressure data) on the used test methodology is investigated. The possible non-conservative direction of the influence (currently used weighting factors are giving lower leakage rate) was demonstrated and a new set of weighting factors is proposed too.

CHARACTERISTIC OF AGGREGATHOSCOPY METHOD FOR REGISTERING OF ERYTHROCYTES MICRORHEOLOGY

2017 ◽  
Author(s):  
А. Муравьев ◽  
И. Тихомирова ◽  
А. Замышляев ◽  
П. Михайлов ◽  
Е. Петроченко ◽  
...  
Keyword(s):  
Image Processing ◽  
Prostaglandin F2α ◽  
Accurate Method ◽  
Erythrocyte Aggregation ◽  
Suspension Stability ◽  
Ionophore A23187 ◽  
Test Results ◽  
Rate Test ◽  
Positive Correlations ◽  
Special Computer Program

Введение. Две микрореологические характеристики определяют кровоток в системе сосудов микроциркуляции — агрегация и деформируемость эритроцитов. В подавляющем большинстве приборов для регистрации агрегации эритроцитов (АЭ) отсутствует визуализация процесса, и интерпретация данных основывается на его косвенных характеристиках. Материалы и методы. Проведено исследование АЭ на созданной установке — агрегатоскопе, получены данные регистрации картины АЭ с последующей обработкой изображения с помощью специальной программы для ЭВМ. Информативность полученных данных была проверена в сравнительных исследованиях с использованием агрегометра эритроцитов Myrenne M1 и теста СОЭ. Результаты. Получены значительные положительные корреляции (r=0,90 и r=0,86, соответственно). Показано, что агрегатоскоп дает четкую картину изменения АЭ (ее снижение) при инкубации эритроцитов с хелатором Са2+ (ЭДТА, верапамил, изобутилметилксантин, монафрам). В ответ на инкубацию с препаратами другой группы, известными как стимуляторы АЭ (CaCl2, ионофор А23187, фенилэфрин, простагландин F2α), был получен достоверный прирост агрегации. Заключение. Метод агрегатоскопии в сочетании с программной обработкой изображений является удобным и надежным инструментом оценки суспензионной стабильности крови и точным методом измерения важной микрореологической характеристики эритроцитов — их агрегации. Introduction. Aggregation and deformability of erythrocytes are two microrheological characteristics that determine the blood fl ow in microcirculation vessels. In large majority of devices for registration of erythrocyte aggregation (EA) there is no visualization of the process, and the interpretation of the data is based on its indirect characteristics. Materials and methods. EA investigation was carried out on the created unit — aggregatoscop. Data were obtained for registration of EA followed by image processing using a special computer program. Data informativeness was verified in comparative studies using erythrocyte aggregometer Myrenne M1 and erythrocyte sedimentation rate test. Results. Significant positive correlations were obtained (r=0,90 and r=0,86, respectively). It was shown that aggregatoscop gave a clear picture of EA changes (its reduction) during erythrocytes incubation with Са2+ chelator (EDTA, verapamil, isobutylmethylxanthine, monaphram). Reliable increasing of aggregation was obtained in response to incubation with other agents — EA stimulants (CaCl2, ionophore A23187, phenylephrine, prostaglandin F2α). Conclusion. Aggregoscopy method in combination with software image processing is a convenient and reliable tool for assessing of blood suspension stability and an accurate method for measuring of important microrheological characteristics of erythrocytes — their aggregation.

INFLUENCE OF FILLERS ON THE RHEOLOGICAL PROPERTIES OF THEIR COMPOSITIONS WITH LUBRICATING GREASES

Tribologia ◽  
2018 ◽  
Vol 273 (3) ◽  
pp. 47-55 ◽  
Author(s):  
Ryszard CZARNY
Keyword(s):  
Shear Stress ◽  
Rheological Properties ◽  
Tribological Properties ◽  
Corrosion Inhibitors ◽  
Experimental Tests ◽  
Lubrication System ◽  
Test Results ◽  
Rate Test ◽  
Oxidation And Corrosion ◽  
System Knowledge

The paper presents the results of studies on the influence of fillers, introduced into lubricating greases, on the rheological properties of resultant grease compositions. These fillers were graphite and PTFE powders. They are added to greases in order to improve their tribological properties. They also affect their rheological properties, and they mainly change the value of the shear stress in grease during its flow in a lubrication system. Knowledge of this value is important in designing automated central lubrication systems in which these compositions may be used. Measurements during experimental tests were performed by means of a rotary rheometer Rheotest 2.1. Tests were performed on pure lithium and bentonite greases, with the addition of oxidation and corrosion inhibitors as well as compositions of these greases with different shares of the above mentioned fillers. These tests were performed by changing the gradient of shearing rate. Test results have shown that both the kind of grease and the kind of filler introduced into this grease affect the rheological properties of produced grease compositions.

Determination of Stress Corrosion Cracking Resistance of Al-Cu-Mg Alloys by Slow Strain Rate and Alternate Immersion Testing

CORROSION ◽  
1981 ◽  
Vol 37 (2) ◽  
pp. 98-103 ◽  
Author(s):  
Shantanu Maitra
Keyword(s):  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Slow Strain Rate ◽  
Test Method ◽  
Slow Strain Rate Test ◽  
Test Results ◽  
Alloy Plate ◽  
Rate Test

Abstract Increased artificial aging from the T351 temper to T851 temper is known to increase resistance to stress corrosion cracking (SCO for Al-Cu-Mg alloy 2124. A series of incrementally aged 2124 alloy plate was tested for resistance to SCC by the slow strain rate technique and by the conventional alternate immersion test method. It is shown that slow strain rate test results are in agreement with the conventional test results. Using fracture energy and other loss in ductility parameters to denote resistance to SCC, it has been shown that this technique can be used as a more accurate SCC test. SEM examinations of fracture surfaces confirm the SCC indices obtained by the slow strain rate test.

Characterization of Sealing Behavior of Gaskets for the Leak Rate Based Design of Gasketed Bolted Flanged Connections

2008 ◽  
Author(s):  
Takashi Kobayashi
Keyword(s):  
Internal Pressure ◽  
Testing Procedure ◽  
Test Method ◽  
Leak Rate ◽  
Test Results ◽  
Japanese Industrial Standard ◽  
Sealing Performance ◽  
Stress Levels ◽  
Spiral Wound

This paper discusses the sealing behavior of gaskets according to the gasket testing procedure HPIS Z104 established in Japan. The testing procedure consists of eleven gasket stress levels while the internal pressure is constant. It takes about 3 hours to complete one test, which is acceptable for gasket manufacturers. The test method is going to be effective as the Japanese Industrial Standard (JIS) soon. Several sheet gaskets and spiral wound gaskets were tested based on the test method HPIS Z104 and test results are compared and discussed in this paper. Based on the test results, experimental formulas are proposed to approximate the sealing behavior of gaskets. It is shown that the sealing behavior of gaskets can be well characterized using the proposed testing procedure and the experimental formulas. The formulas have the possibility of application to the design of gasketed bolted flanged connections. It is also shown that the sealing performance of spiral wound gaskets with graphite and PTFE fillers is as good as that of sheet gaskets under an equal gasket load.

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