• Title/Summary/Keyword: Full-scale testing

Search Result 230, Processing Time 0.025 seconds

REVIEW AND FUTURE ISSUES ON SPENT NUCLEAR FUEL STORAGE

  • Saegusa, T.;Shirai, K.;Arai, T.;Tani, J.;Takeda, H.;Wataru, M.;Sasahara, A.;Winston, P.L.
    • Nuclear Engineering and Technology
    • /
    • v.42 no.3
    • /
    • pp.237-248
    • /
    • 2010
  • The safety of metal cask and concrete cask storage technology has been verified by CRIEPI through several research programs on demonstrative testing for the interim storage of spent fuel. The results have been reflected in the safety requirements for dry casks issued by NISA/METI (Nuclear and Industrial Safety Agency, Ministry of Economy, Trade and Industry) of the Japanese government. On top of that, spent fuel integrity has been studied by the Japan Nuclear Energy Safety Organization (JNES). This paper reviews these research programs. Future issues include the long-term integrity of cask components and high burn-up spent fuel.

Testing of RC Corner Beam-column Joints under Bidirectional Loading (이방향 하중을 받는 모서리 보-기둥 접합부의 내진성능 평가)

  • Han, Sang Whan;Chang, Yong Seok;Lee, Chang Seok
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.24 no.4
    • /
    • pp.189-196
    • /
    • 2020
  • In this study, two full-scale gravity load-designed reinforced concrete corner beam-column joints were tested by being subjected to uniand bi-directional cyclic lateral loading. The test variable was loading type: uni- or bi-directional loading. To investigate the effect of the loading type on the cyclic behavior of joint specimens, damage progression, force-deformation relation, contribution of joint deformation to total drift, joint stress-strain response, and cumulative energy dissipation were investigated. The test data suggest that bidirectional loading can amplify damage accumulation in the joint region.

Thrust - Performance Test of Ethylene-Oxygen Single-Tube Pulse Detonation Rocket

  • Hirano, Masao;Kasahara, Jiro;Matsuo, Akiko;Endo, Takuma;Murakami, Masahide
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2004.03a
    • /
    • pp.205-210
    • /
    • 2004
  • The pulse detonation engine (PDE) has recently expected as a new aerospace propulsion system. The PDE system has high thermal efficiency because of its constant-volume combustion and its simple tube structure. We measured thrust of single-tube pulse detonation rocket (PDR) by two methods using the PDR-Engineering Model (full scale model) for ground testing. The first involved measuring the displacement of the PDR-EM by laser displacement meter, and the second involved measuring the time-averaged thrust by combining a load cell and a spring-damper system. From these two measurements, we obtained 130.1 N of time-averaged thrust, which corresponds to 321.2 sec of effective specific impulse (ISP). As well, we measured the heat flux in the wall of PDE tubes. The heat flux was approximately 400 ㎾/$m^2$. We constructed the PDR-Flight Mode] (PDR-FM). In the vertical flight test in a laboratory, the PDR-FM was flying and keeping its altitude almost constant during 0.3 sec.

  • PDF

A Response Characteristic Analysis of Impact Acceleration Using Crash Dynamics Models (충돌동역학 모델링 기법에 따른 충돌가속도 응답특성 분석)

  • Cho, Hyun-Jik;Kim, Woon-Gon;Koo, Jeong-Seo
    • Proceedings of the KSR Conference
    • /
    • 2008.11b
    • /
    • pp.1602-1606
    • /
    • 2008
  • In the Rail Safety Regulations article 16, deceleration rate in the survival spaces should be limited as far as is practicable to 5g, and shall not be more than 7.5g. As it is impractical to evaluate complete train behaviour by testing, the achievement of the objectives shall be validated by dynamic simulations corresponding to the reference collisions scenarios. But initial design and evaluation procedure, impact dynamics model which classified 1D and 2D is more useful than full scale model. This paper presents acceleration response characteristics between 1D and 2D dynamics model under head-on collision in standard collision scenarios.

  • PDF

Behavior of full-scale prestressed pile-deck connections for wharves under cyclic loading

  • Blandon, Carlos A.;Krier, Christopher J.;Restrepo, Jose I.
    • Earthquakes and Structures
    • /
    • v.16 no.4
    • /
    • pp.455-468
    • /
    • 2019
  • The behavior of pile-deck connections of pile-supported marginal wharfs subjected to earthquake loading is of key importance to ensure a good performance of this type of structures. Two precast-pretensioned pile-deck connections used in the construction of pile-supported marginal wharfs were tested under cyclic loading. The first is a connection with simple reinforcement details and light steel ratio developed for use where moderate pile-deck rotation demands are expected in the wharf. The second is specifically developed to sustain the large rotation, shear force and bending moment demands, as required for the shortest piles in a marginal wharf. Data obtained from the test program is used in the paper to calibrate an equivalent plastic hinge length that can be incorporated into nonlinear analysis models of these structures when prestressed pile-deck connections with duct embedded dowels are used.

Missing Pattern Analysis of the GOCI-I Optical Satellite Image Data

  • Jeon, Ho-Kun;Cho, Hong Yeon
    • Ocean and Polar Research
    • /
    • v.44 no.2
    • /
    • pp.179-190
    • /
    • 2022
  • Data missing in optical satellite images caused by natural variations have been a crucial barrier in observing the status of marine surfaces. Although there have been many attempts to fill the gaps of non-observation, there is little research to analyze the ratio of missing grids to overall sea grids and their seasonal patterns. This report introduces the method of quantifying the distribution of missing points and then shows how the missing points have spatial correlation and seasonal trends. Both temporal and spatial integration methods are compared to assess the effectiveness of reducing missing data. The temporal integration shows more outstanding performance than the spatial integration. Moran's I and K-function with statistical hypothesis testing show that missing grids are clustered and there is a non-random distribution from daily integration. The result of the seasonality test for Moran's I through a periodogram shows dependency on full-year, half-year, and quarter-year periods respectively. These analysis results can be used to deduce appropriate integration periods with permissible estimation errors.

Cyclic Seismic Testing of Full-Scale Column-Tree Type Steel Moment Connections (반복재하 실물대 실험에 의한 컬럼-트리(Column-Tree) 형식 철골 모멘트 접합부의 내진거동 연구)

  • Lee, Cheol Ho;Park, Jong Won
    • Journal of Korean Society of Steel Construction
    • /
    • v.10 no.4 s.37
    • /
    • pp.629-639
    • /
    • 1998
  • This paper summarizes the results of full-scale cyclic seismic performance tests on three column-tree type steel moment connections. Each test specimen consisted of a $H-600{\times}200$ beam and a $H-400{\times}400$ column of SS41 (SS400). Key parameter included was column PZ (panel zone) strength relative to beam strength. The seismic performance of specimen with stronger PZ tended to be inferior. Total plastic rotations available in the specimens ranged from 1.8 to 3.0 (% rad). The limited test results in this study seem to support the speculation that permitting PZ yielding shall be more beneficial to enhancing total plastic rotation capacity of the moment connection. Beam flange fracture across the heat affected zone and divot-type pullout of the column flange were observed in the tests. A conceptual mechanical model consistent with observed test results was also sought.

  • PDF

Removal of Toxicity from Kraft Pulp Mill Effluents by Activated Sludge Process (활성슬러지 공정에 의한 Kraft 펄프 폐수의 독성 제거)

  • Kim, Yeong-Kwan
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.8 no.3
    • /
    • pp.9-18
    • /
    • 1994
  • Activated sludge pilot plant testing was conducted to determine the ability of a well-designed activated sludge treatment system to remove chromic toxicity from the bleached kraft pulp mill effluent. Removals of conventional(BOD and SS) and nonconventional(resin and fatty acids, color, AOX) pollutants were estimated. The pilot plant was operated at steady state for about 10 weeks at an F/M of 0.28 and a sludge age of 8.4 days. The average MLSS concentration was 4,309mg/l, of which volatile fraction was 57%. During the operation period, the BOD removal reaction rate(k) was determined to be 8.2/day at $30^{\circ}C$. The BOD removal was 84 percent, which was 3 to 6 percent lower than expected for full-scale treatment. The chronic toxicity of the activated sludge effluent was tested by employing both Dinnel and the BML protocols. It was found that the pilot plant could achieve in excess of 90 percent reduction in chronic echinoderm toxicity. The data show slight reduction of color and AOX across the activated sludge system. The pilot system, however, demonstrated on excellent removal of resin and fatty acids.

  • PDF

Test Method to Evaluate the Fiber Material Properties of Filament Wound Composite Pressure Vessel (필라멘트 와인딩 복합재 압력용기의 섬유 방향 물성 평가 기법)

  • Hwang, Tae-Kyung;Park, Jae-Beom;Kim, Hyoung-Geun
    • Composites Research
    • /
    • v.23 no.3
    • /
    • pp.37-42
    • /
    • 2010
  • The fiber material properties, elastic constant and strength, are the most important factors among the various material properties for the design of composite pressure vessel, because of it's dominant influence on the performance of composite pressure vessel. That is, the deformation and burst pressure of pressure vessel highly affected by the fiber material properties. Therefore, the establishment of test method for exact fiber material properties is a priority item to design a composite pressure vessel. However, the fiber material properties in filament wound pressure vessel is very sensitive on various processing variables (equipment, operator and environmental condition etc..) and size effect, so that it isn't possible to measure exact fiber material properties from existing test methods. The hydro-burst test with full scale pressure vessel is a best method to obtain fiber material properties, but it requires a enormous cost. Thus, this paper suggests a newly developed test method, hoop ring test, that is capable of pressure testing with ring specimens extracted from real composite pressure vessel. The fiber material properties from hoop ring test method showed good agreement with the results of hydro-burst test with full scale composite pressure vessels.

Verifications of the Impact-echo Technique for Integrity Evaluations of the Drilled Shaft Using Full Scale Tests (현장시험에 의한 충격반향기법의 말뚝 건전도 검사 적용성 평가)

  • Jung Gyungja;Cho Sung-Min;Kim Hong-Jong;Jung Jong-Hong
    • Journal of the Korean Geotechnical Society
    • /
    • v.21 no.5
    • /
    • pp.207-214
    • /
    • 2005
  • The reflected signals from the defects of a pile and the boundaries between the pile and soils are analyzed to evaluate the integrity of drilled shafts in the impact-echo test. Signals varied according to both of the stiffness ratio of the pile to defects and that of the pile to surrounding soils. Model tests using the small size pile in the laboratory and numerical analyses have limitations in finding the characteristics of the signals due to different stress wave characteristics and unreliable modelling for the interaction between the pile and soils respectively. Full scale testing piles which have artificial defects are installed by the actual construction method and they were used to investigate the characteristics of reflected signals according to defects and the stiffness ratios of the pile to soils around.