zircaloy


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Related to zircaloy: Zirconium Alloys

zircaloy

[′zərk·ə‚lȯi]
(metallurgy)
Any member of a group of alloys containing mainly zirconium that possess resistance to corrosion and stability over a wide range of temperatures and types of radiation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Nilsson, "Evaluation of fretting damage of zircaloy cladding tubes," Journal of Tribology, vol.
This temperature limit for CWSR zircaloy cladding is much lower than in case of Zr-2.5Nb pressure tube materials.
The computational domain consists of Zr 2.5Nb (PT) mounted concentrically inside a section of Zircaloy 2 (CT): see Figure 2(a), which are given as a material properties in E and v, functions of local temperature.
The results of rank regression analysis showed that 2 out of 5 selected uncertain parameters, i.e., the zircaloy melt breakout temperature and molten clad drainage rate, have the largest contribution to the uncertainty of the time of melt relocation and the time of lower plenum dryout in the MELCOR results.
Most power reactors rely on fuel consisting of uranium dioxide pellets surrounded by a zircaloy sheath.
Parameter Value Reactor PWR Fuel type U[O.sub.2] Average fuel enrichment wt% 2.5% Core-specific power (MWth/kgU) 33.3 Core power density (MWth/[m.sup.3]) 66.6 System pressure (MPa) 15.166 Reactor coolant system pressure (MPa) 14.96 Reactor coolant flow (kg/s) 17387.7 Vessel height (m) 12.41 Core active region height (m) 3.65 Core diameter (m) 3.81 Fuel rod assemblies 193 Control rod assemblies 76 Cladding material Zircaloy Fuel rod outer diameter (cm) 1.092 Rod pitch (cm) 1.443 Fuel assembly matrix 17 x 17 Coolant inlet temperature (K) 564.81 Coolant outlet temperature (K) 592.98 Control rods 1420 Control rod material Ag (80%)-In (15%)-Cd (5%) Table 2: Consequences and events in LOCA for simulation.
The lower/upper bound of zircaloy melt breakout temperature (SC1131(2)) was defined by melting point of zircaloy (2100 K) and the value of hydrogen uncertainty study [12] based on Phebus experiments [13].
As the primary water was depleted and the core water temperature increased, zircaloy in the fuel cladding was highly oxidized by the high temperature steam.
Number of fuel rods per assembly 62 Pressure 6.93 MPa nominal Power (thermal) 2029 [MW.sub.t] Steam flow 1100 kg/s Recirculation pumps 2 Recirculation 2565 kg/s nominal flow Feed water flow 1097 kg/s Number of jet pumps 20 Vessel Made of carbon steel, internally clad with stainless steel; Total height; 20.8 m, diameter 5.30 m; thickness from 0.13 to 0.19 m; Lower head radius (cylindrical part) = 2.71 m; thickness (cylindrical part) = 0.19 m; radius (hemispherical part) =2.87 m; thickness (hemispherical part) = 0.19 m; heat surface (hemispherical part) = 38.5 [m.sup.2]; Mass of Zircaloy Total mass in the core 27045 kg.