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[en] En-masse Coolant Channel Replacement of Madras Atomic Power Station (MAPS) was carried out in year 2002 (MAPS-2) and in year 2005 (MAPS-1). Large quantities of solid wastes were generated during the job and Pressure Tubes (PTs) accounted for major portion among them. In 2002 campaign, disposal of PTs were carried out in non-retrievable form; by cutting them in to two, disposing in Tile Holes (TH) and fixing in cement matrix. After considering the cumulative exposure incurred for the job and also the non-retrievable nature of disposal, it was decided to store PTs from 2005 campaign in a specially made Pressure Tube Storage Bay (PTSB). This gave sufficient cooling period, which brought down the radiation level on PTs considerably and also an opportunity to retrieve them back to preserve Zirconium for reuse
[en] This paper studies the experimental and exergy analysis of solar still with the sand heat energy storage system. The cumulative yield from solar still with and without energy storage material is found to be 3.3 and 1.89 kg/m2, respectively for 8-h operation. Results show that the exergy efficiency of the system is higher with the least water depth of 0.02 m (mw = 20 kg). Competitive analysis of second law efficiency shows that the exergy efficiency improves the system by 30% than conventional single slope solar still without any heat storage. The maximum exergy efficiency with energy storage material is found as 13.2% and it is less than the conventional solar still without any material inside the basin.
[en] Nanocrystalline Ni-Cu ferrites (Ni0.5Cu0.5Fe2O4) were prepared using solution combustion method. The structure of the samples were studied with the X-ray diffraction (XRD) using Cu-Kα radiation. Frequency and temperature dependence of dielectric and a.c. conductivity studies have been undertaken on the Ni-Cu nanoferrites in the frequency region 100Hz-5MHz. The dielectric constant (ε′) is found to decrease initially with the frequency and finally reaching a constant value at higher frequencies. Observed trends in the dielectric constant are ascribed to the Maxwell-Wagner type interfacial polarization, which is in agreement with the Koop'fs phenomenological theory. The a.c. conductivity (σac) is found to increase with an increase in the frequency from room temperature up to 300 °C. However, at a temperature of 400 °C, the a.c. conductivity is found to decrease with an increase in the frequency exhibiting an abnormal behavior. The electrical conduction mechanism in the present nano nickel-copper ferrite is found to be in accordance with the electron hopping model.