Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Pressure Tube"”.
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Transmutation rates in the annulus gas of pressure tube water reactors
CANDU (CANada Deuterium Uranium) reactor utilizes Pressure Tube (PT) fuel channel design and heavy water as a coolant. Fuel channel annulus gas acts as an insulator to minimize heat losses from the coolant to the moderator. Since fuel bundles are continuously under high neutron fluxes, annulus gas …
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Conceptual design of a large, passive, pressure-tube light water reactor
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Computational fluid dynamic investigations of flow through an aged CANDU pressure tube
… bundles sitting in both as-received and aged pressure tubes were performed with Hydra in this work. The predicted coolant flow behaviour of two cases were compared in order to investigate the impact of pressure tube deformation (sag and diametral expansion) on coolant flow. The boundary …
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Leakage-corrected discontinuity factors for a second-generation Th-Pu pressure-tube SCWR.
The neutron flux throughout a reactor core should be calculated, ideally, by solving the neutron transport equation for a highly detailed geometric model of the core. Since this is computationally impractical, approximate node-homogenized models have historically been used whereby neutronic …
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Performance analysis of matrix fuel for a passive pressure tube light water reactor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995.
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Investigation of pressure-tube and calandria-tube deformation following a single channel blockage event in ACR-700
The ACR-700 is an advanced pressure-tube (PT) reactor being developed by Atomic Energy of Canada Limited (AECL). As in conventional CANDU reactors, the PTs are horizontal. Each PT is surrounded by a calandria tube (CT), and the gap in between is filled with carbon dioxide gas. The space between the …
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An evaluation of the net breeding capability of heterogeneously-fuelled pressure-tube heavy water reactors with the thorium fuel cycle
… future option for an alternative to uranium. The pressure tube heavy water reactor (PT-HWR) has for decades been considered capable of achieving net breeding on the thorium fuel cycle, but this capability has not been conclusively demonstrated. The goal of this work was to perform reactor physics …
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Study on specifics of thermalhydraulics and neutronics of pressure-channel supercritical water-cooled reactors (SCWRs)
… reactor’s high outlet temperatures. The Canadian pressure-tube-type SCWR is featured with 3-batch refueling, 336 vertical fuel channels, a porous ceramic insulator inside the pressure tube, and stainless-steel cladding. The reactor operates at a pressure of 25 MPa with the coolant temperature …
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Enhanced ultrasonic techniques for inspection of pressure tubes
Pressure tube inspection within CANDU nuclear reactors is a critical maintenance operation to identify and track the growth of defects. Current inspection approaches utilising ultrasonic techniques are technically challenging due to transducer alignment caused by the tube dimensional changes. This …
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Conceptual design for a re-entrant type fuel channel for supercritical water-cooled nuclear reactors
… The Re-Entrant fuel-channel consists of three tubes, the inner tube (flow tube), pressure tube and an outer tube. The fuel bundles are placed in the inner tube. An annulus is formed between the flow and pressure tubes, through which the primary coolant flows. A ceramic insulator is placed …
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Evaluation of material attractiveness to non-state actors of various nuclear materials in Thorium fuel cycles
… stone, thorium-based fuels have been paired with pressure tube heavy water reactors because of their high neutron economy and online refueling capability. However, thorium fuel cycles have raised proliferation concerns regarding the presence of U-233 following the irradiation of fuel bundles. The …
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Effect of ion irradiation on the rate dependence of plastic deformation of extruded Zr-2.5%Nb
… thesis is to examine the properties of Zr-2.5%Nb pressure tube material in the transverse direction. Through testing at room temperature, material properties such as the strain hardening, strain rate sensitivity and apparent activation volume were investigated. The effects of Zr+ ion-implantation …
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SYNTHESIS OF N-HETEROCYCLES VIA PALLADIUM-CATALYZED REDUCTIVE CYCLIZATION REACTIONS OF NITROARENES AND NITROALKENES USING FORMIC ACID DERIVATIVES AS CO SURROGATES
… is not possible. A cheap thick-walled glass “pressure tube” can be used instead of less-available autoclaves.
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Experimental characterization of the dynamic response of a mock-up CANDU fuel bundle
… contact dynamics between the fuel bundle and the pressure tube are replicated using a high precision custom-made setup. Also, the contact between the fuel bundle and the neighboring fuel bundles are replicated using dummy endplates. The results show that the fundamental frequency of the fuel …
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Improved 3D modelling of CANDU reactors using transport-fitted diffusion coefficients
… neutronic physics behavior of the core in CANDU pressure tube type heavy water reactors with natural-uranium fuel, two levels of calculations are required. Initially, lattice-level transport calculations are carried out to obtain, with high detail and accuracy, the flux distribution inside the …
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Heat-transfer analysis of double-pipe heat exchangers for indirect-cycle SCW NPP
… parameters compared to current NPPs, i.e., pressure of about 25 MPa and outlet temperature up to 625 oC. This study presents the heat transfer analysis of an intermediate Heat exchanger (HX) design for indirect-cycle concepts of Pressure-Tube (PT) and Pressure-Vessel (PV) SCWRs. …
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Estimation of coping time in pressurized water reactors for accident tolerant fuel claddings
… high-temperature oxidation of Cr-coated Zircaloy pressure tube. Post-test analysis showed that for some regions, the Cr-coating is still present after 90 minutes of exposure to 1200°C steam, protecting the Zircaloy substrate beneath the coated layer. The performances of the FeCrAl and Cr-coated …
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Generating and Simulating CANDU® Fuel Channel Eddy Current Data to Demonstrate Multi-Parameter Extraction Capabilities
… Uranium) nuclear reactors to verify that Pressure Tube to Calandria Tube (PT-CT) gap in Fuel Channels is larger than the minimum requirement. Contact between the two tubes can severely reduce the structural integrity of the PT. The measurement is affected by nearby conducting structures, …
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Localization of a robotic crawler for CANDU fuel channel inspection
… mm distance that the robot travels inside the pressure tube. This is extrapolated from the test results completed over the shorter length test bench with simulated surface unevenness. The key benefits of the pipe crawling robot when compared to the current system include: reduced dosage to …
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Thermal aspects of high efficiency channel with conventional and alternative fuels in SuperCritical water-cooled reactor (SCWR) applications
… to reactor‘s high outlet temperatures. A generic pressure-channel (or pressure-tube)SCWR operates at a pressure of 25 MPa with inlet- and outlet-coolant temperatures of 350°C and 625°C. Consequently, the sheath and fuel centerline temperatures are higher in SCWRs than those of the current nuclear …
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