scholarly journals Preliminary Study on the Remaining Life Estimation Method for Research Reactor Tank Liner

2021 ◽  
Vol 927 (1) ◽  
pp. 012046
Author(s):  
Diah Hidayanti Sukarno ◽  
Bintoro Aji ◽  
Yudi Pramono
Keyword(s):  
Corrosion Rate ◽  
Quantitative Assessment ◽  
Research Reactor ◽  
Neutron Fluence ◽  
Estimation Method ◽  
Qualitative Assessment ◽  
Remaining Life ◽  
Liner Material ◽  
Life Estimation ◽  
Preliminary Study

Abstract The reactor tank liner is one of the most crucial safety barriers in a research reactor as it retains the radioactive material released from the fuel during the accident condition. It also contains the primary coolant for fission heat removal. The integrity of the tank liner determines the service life of the research reactor. So far, the remaining life estimation of pressure vessels in nuclear power plants is more widely applied and established than that of the research reactor tank liner. Therefore, a study on the remaining life estimation method of the research reactor tank liner is needed to ensure the research reactor operation safety. This paper aims to preliminarily study several methods applied to estimate the remaining life of a research reactor tank liner. The preliminary study consists of a qualitative assessment and a quantitative assessment. The qualitative assessment aims to propose several techniques or methods applied in estimating the remaining life of the reactor tank liner. The quantitative assessment applies one of the remaining life estimation methods discussed in the previous assessment. Generally, the remaining life of the research reactor tank liner can be estimated using the theoretical method and the experimental method. The theoretical methods are applied by calculating the neutron fluence received by the tank liner or by analyzing the fracture mechanics using numerical modeling if the cracks or other defects exist. The calculation of atom displacement number (dpa), as a standard measure of the neutron-induced radiation damage of the materials, can support the neutron fluence calculation. The experimental method is conducted by measuring several parameters of the tank liner material, such as the corrosion rate or the mechanical properties. In the quantitative assessment, the remaining life estimation of the Kartini Reactor tank liner was performed by neutron fluence calculation method using MCNP6 computer code. The result shows that the maximum neutron fluence received by the tank wall is 2.950E+17 n/cm2 for 40 years operating period. By comparing the cumulative neutron fluence received for 40 years to the thermal neutron fluence limit value of 1.18E+23 n/cm2, the Kartini Reactor tank liner can still be used for the next 1.6E+07 operation years. The result of the quantitative assessment implicitly shows that the remaining life estimation of the tank liner needs to: 1) consider all defects experienced by the tank liner and all factors (e.g., thermal, radiation, chemical, cyclic loading) which affect the tank liner material condition, and 2) perform the combination of theoretical and experimental methods. For an open-pool type reactor, corrosion monitoring and corrosion rate measurement are essential to perform the remaining life assessment of the tank liner.

Creep-Fatigue Strength of Long-Term Post-Service 2 · 1/4 Cr-1 · Mo Steel and Remaining Life Estimation

1991 ◽  
Vol 113 (4) ◽  
pp. 549-555 ◽  
Author(s):  
M. Okazaki ◽  
M. Hashimoto ◽  
T. Mochizuki
Keyword(s):  
High Temperature ◽  
Fatigue Strength ◽  
Fatigue Damage ◽  
Estimation Method ◽  
Remaining Life ◽  
Life Estimation ◽  
Creep Fatigue ◽  
Long Time ◽  
Longitudinal Ultrasonic Wave

Creep-fatigue strength of post-service 2 · 1/4 Cr-1 · Mo steel used for about one hundred-thousand hours in a fossil fuel power plant was studied. The creep-fatigue strength of the post-service material was lower than that of the virgin material, whereas it was comparable to that of thermally aged material, which was artificially exposed at high temperature for a long time so that it had an equivalent value of the Larson-Miller parameter to the post-service material. The nondestructive detection of the long-term degradation damage due to long-term thermal aging, as well as due to creep-fatigue, was also investigated by applying an ultrasonic technique. It was found that the energy attenuation coefficient, α, which is defined by the ratio of input to output energies of a longitudinal ultrasonic wave, had a good correlation with creep-fatigue damage in the virgin, aged and post-service materials; and hence, α was a successful parameter to detect creep-fatigue damage. Based on the results thus obtained, a new remaining life estimation method for creep-fatigue of in-service high-temperature materials was proposed. The application of the method to the post-service material tested gave good predicted results.

scholarly journals Application of the Modified Вagolini Test in the Diagnosis of Binocular Vision Disorders

2020 ◽  
Vol 17 (3) ◽  
pp. 435-441
Author(s):  
S. I. Rychkova ◽  
V. G. Likhvantseva
Keyword(s):  
Binocular Vision ◽  
Quantitative Assessment ◽  
Qualitative Evaluation ◽  
High Sensitivity ◽  
Qualitative Assessment ◽  
Control Group ◽  
Color Test ◽  
Functional Correction ◽  
Personalized Approach ◽  
The Right

The work is devoted to one of the most actual problems of current strabismology — the development of effective ways to study binocular vision.The purpose — to study the effectiveness of the developed modification of the Bagolini test in the diagnostics of binocular disorders.Patients and methods. 240 patients with non-paralytic strabismus aged from 6 to 17 (on average 10.8 ± 0.24) years were observed. There were 190 patients with converging strabismus and 50 patients with diverging strabismus. The control group consisted of 180 children aged also from 6 to 17 (on average 10.9 ± 0.3) years without ophthalmopathology. All children were examined for the character of vision using a Worth-test, the classic Bagolini test (CTB), and the developed modified Bagolini test (MTB). If the patient has a strabismus angle, the study was performed in two variants: without prismatic deviation compensation (under the subjective angle of strabismus — SU) and under full prismatic compensation (under the objective angle of strabismus — OU). For qualitative assessment of binocular vision with MTB, static presentation of the test image was used, for quantitative assessment — alternating (alternate presentation of details corresponding to the right and left eyes).Results. The qualitative evaluation data obtained with the help of MTB made it possible to differentiate patients with non-permanent regional functional scotoma of suppression (FSP) and patients with stable bifoveal fusion among children with binocular vision by color test, and to distinguish patients with regional stable FSP and total FSP among children with monocular vision by color test. In the study under SU, the sensitivity of the method was 97.8 % and specificity 96.2 %, under OU — 96.6 % and 92.7 %, correspondingly. Using quantitative evaluation, it was found that the minimum duration of monocular phases required to eliminate functional inhibition in children with total FSP is twice as long as in children with regional FSP (z = 6,303, df 52, p < 0.001 according to the Mann — Whitney criterion).Conclusion. Thus, the modified Bagolini test developed by us is an effective way of qualitative and quantitative assessment of the state of binocular vision. The method has a high sensitivity and specificity, combines the capabilities of anaglyphic and phase haploscopy, and can be used for a personalized approach to the selection of conditions and modes of functional correction of binocular disorders, as well as for monitoring binocular vision during treatment. 

scholarly journals Development of scientific and methodological approach to quantitative and qualitative assessment of intellectual property management in industrial enterprises

2021 ◽  
Vol 2 (13 (110)) ◽  
pp. 28-41
Author(s):  
Diana Raiko ◽  
Viktoriia Cherepanova ◽  
Ihor Sylka ◽  
Olha Podrez ◽  
Irina Fedorenko
Keyword(s):  
Intellectual Property ◽  
Quantitative Assessment ◽  
Methodological Approach ◽  
Market Value ◽  
Qualitative Assessment ◽  
Property Management ◽  
Industrial Enterprises ◽  
Intellectual Property Management ◽  
Intellectual Potential ◽  
The Impact

The competitiveness, market value and income of an enterprise depend on the level of intellectual property management. Therefore, the aim of research is to develop, substantiate and test a scientific and methodological approach to a quantitative and qualitative assessment of the management of intellectual property of industrial enterprises.  The originality of the proposed approach is that on the basis of the concept of "management of intellectual property" a procedure for current management has been developed, the main stage of which is a quantitative and qualitative assessment. The assessment is based on the structural and logical model, which is built according to two criteria. The criteria make it possible to determine the current state of the use of intellectual property (intangible assets) – a quantitative assessment, and the prospect of further use (intellectual potential) – a qualitative assessment. A quantitative assessment involves the calculation of indicators characterizing the state of assets, the dynamics of the impact on the market value of the enterprise, the profitability of production, which is proposed to be determined through the net cash flow from operating activities. A qualitative assessment is carried out in terms of components (information and investment, organizational and legal, economic, personnel and motivation), tools and relative indicators that characterize the intellectual potential of an industrial enterprise. The assessment is carried out using a general integral indicator, which is of practical importance, since it shows the existing level of intellectual property management and directions for improvement in the future. The approbation of the scientific and methodological approach was carried out on the example of three Ukrainian coke-chemical enterprises (CJSC Avdeevka Coke Plant, CJSC Zaporozhkoks, CJSC Yuzhkoks) of the American association SUNCOKE ENERGY, INC and the Polish association J.S.W. S.A. Group. Empirical studies for the period from 2015 to 2019 made it possible to build a scale for assessing the level of intellectual property management according to the Harrington function

scholarly journals A Life Estimation Method of Helicopter Transmission System Key-parts

2018 ◽  
Vol 382 ◽  
pp. 052016
Author(s):  
Qing Mei ◽  
Tiancai Guo ◽  
Tongbo Xue ◽  
Hua Wen ◽  
Zhenrong Huang
Keyword(s):  
Estimation Method ◽  
Transmission System ◽  
Life Estimation ◽  
Helicopter Transmission
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