Prabhakar Gundlapalli

Nuclear Power Corporation of India ltd. | NPCIL · Light Water Reactors Directorate

For the seismic qualification of the Structures, Systems and Components (SSC’s), the Floor Response Spectra (FRS) need to be generated. In the present work, FRS are generated for a structure categorized under Seismic Category 3 as per AERB/NPP-PHWR/SG/ D-23, using the direct spectra-to-spectra method as proposed by Wei Jang et al. (2016). A compara...

Highlights: Inhibition efficiency of compounds was tested in carbonated pore solution contaminated with chloride. Inhibition mechanism was determined by using electrochemical and surface analysis tests. Percolation ability in hardened concrete was also studied by using TLC and UV spectroscopy. Abstract: In the present study, corrosion inhibition ef...

In the present study,the performance of two generic compounds, namely 2-Aminopyridine (AP) and 4-Aminobenzoic acid (ABA) at varying concentrations in carbonated pore solution contaminated by chlorides was investigated by using electrochemical measurement technique (potentiodynamic polarization curves) and surface analysis technique (optical microsc...

EXTENDED ABSTRACT A simple Smartphone with suitably designed App for the in-build accelerometer can serve as vibration measurement tool, to monitor the condition of a structure. The accelerometer can detect vibration in three mutual perpendicular directions. This feature can be used to record vibrations of infrastructure (buildings, structures, bri...

Nuclear Power Plants (NPPs) safety related structures are designed to sustain all operational, environmental, accidental and human-induced design basis loads. Post-Fukushima, concerns were raised on the safety aspects of NPPs for loading arising due to beyond design basis events (BDBE) of natural origin, such as wind, earthquake, tsunami, etc. Subs...

An attempt has been made to study the structural response of calandria vault (CV) supporting the calandria endshield assembly (CEA) of pressurized heavy water reactor (PHWR). The entire structure has been considered as a multi-degree of freedom system with coupled and uncoupled CEA with CV. It has been found that the acceleration level at the point...

A simple mobile phone with accelerometer can serve as vibration measurement and monitoring server. The inbuilt accelerometer can detect vibration in three mutual perpendicular directions. This feature can be used to monitor vibrations of infrastructure (buildings, structures, bridges) and machines, and vehicle driving history, etc. Once knowing the...

The determination of liquefaction susceptibility of soil is a paramount project in geotechnical earthquake engineering. This chapter adopts Support Vector Machine (SVM), Relevance Vector Machine (RVM) and Least Square Support Vector Machine (LSSVM) for determination of liquefaction susceptibility based on Cone Penetration Test (CPT) from Chi-Chi ea...

Method to tune acoustic guitar for Indian Classical Music, to be in synchronization with other instruments.

Understanding music for structural engineers and musicians

Thought for the Day, Creativity Invention / Innovation Discovery Quest (search for an alternative) Research (or Re-Search) / Development (R&D) Manufacture / Produce

The 700 MWe IPHWR is first of its kind in the Indian PHWR programme and as a part of major improvements, 6 mm thick metallic liner has been introduced on the inner surfaces of Inner Containment (IC). The liner is a non-structural member provided as an additional leak-tight barrier under all operating, design basis and design extension conditions. H...

Inner Containment Dome of Kakrapar Nuclear Power Reactors, A First-of-its-Kind Engineering Achievement. • Modular Construction • Prestressed Concrete • Single-Lift Erection • Resource-Efficient, Light-Weight Design

In this paper, transient dynamic analysis of a commercial Boeing 707-320 aircraft crash upon the Mark III containment structure of a Nuclear Power Plant (NPP) has been presented. The impact load is decoupled into impulse load as per the provisions of IAEA-NS-G-1.5 which conforms to Reira formulation. The initial evaluation of the overall structural...

Experimental work was aimed to study ductility behavior of plain concrete with spiral reinforcement, and fibrous concrete subjected to axial loading. Specimens were prepared as per IS code and tested. Based on the study, the following conclusions are drawn; a) Spiral reinforcements may be provided on a selective basis when the structure demands add...

The International Conference on Advances in Civil Engineering and Sustainable Construction (ACESC ‘16), is held on is being conducted by the Department of Civil Engineering, SRM University, Ramapuram campus at Chennai from 30th March to 1st April, 2016. This present Edition is a Homogenous collection of all the papers of Civil Engineering presented...

Design of critical facilities such as nuclear power plant requires an accurate and precise evaluation of seismic demands, as any failure of these facilities poses immense threat to the community. Design complexity of these structures reinforces the necessity of a robust 3D modeling and analysis of the structure and the soil-foundation interface. Mo...

Concrete has been widely used as a protective material to resist impact loads from missiles generated either due to natural or man-made events. Concrete containment walls and internal concrete barrier walls of a Nuclear Power Plant safety related structures are often required to be designed for externally and internally generated missiles. As such...

Estimation of hydrostatic force on underground structures is one of the important loads to be considered for detailed design, and play a major role on the overall economy of the structure. Present practice of taking full hydrostatic pressure under large rafts may lead to uneconomical design. Hence, realistic estimation of ground water table, pressu...

The 700 MWe PHWRs are first of its kind in the Indian PHWR programme and has evolved after forty years of reactor construction, operation and maintenance. A number of improvements have been implemented in the 700MWe power project at Kakrapara Atomic Power Project-3&4 (KAPP-3&4) with respect to the earlier Indian Nuclear Power Plants (NPP). For the...

Generally a base isolator shifts the natural period of the building away from that of the predominant period of the most probable earthquakes and provides additional damping to absorb the energy. The present study focuses on the effi cacy of soil, geofi bre reinforced soil and a layer of smooth geosynthetic membrane placed in soil in reducing the s...

Site selection, characterisation and evaluation form an important part of establishing a Nuclear Power Programme and can be significantly affected by cost and public acceptance. The role of geologists, geo-technologists is significant in this regard. Viewing these aspects, the present practices being followed for site selection and evaluation of de...

There is an increasing demand and awareness among nuclear power industries worldwide about the need to perform Life Cycle Cost Analysis (LCCA). This is required to quantify the risks associated with the investment in new projects or Plant Life Extension (PLEX) of an existing facility by up-gradation and re-qualification or investing in new equipmen...

A parametric study has been carried with the overall objective of containing the effect of different founding levels on the structural response in terms of floor response spectra for Control Building (CB) of a typical Nuclear Power Plant. CB is a multi-storeyed RCC structure with a basement that houses various safety related systems. Three differen...

The nuclear power plant (NPP) structures impose heavy loads on foundation and subsurface materials. Hence, it becomes essential to study and evaluate the properties of the underlying and supporting soil/ rock material up to sufficient depth beyond which the properties no longer affect the safety of the plant. The nature and properties of foundation...

The ongoing project consists of experimental and analytical study of time dependent phenomenon of creep and shrinkage in plain concrete under uniaxial loading conditions for concrete grades used in NPP construction. The various parameters considered in the study such as grade, mix proportions, temperature, relative humidity, age at loading and leve...

Consequent to the aircraft crash on WTC at New York, evaluation of the safety of nuclear containment against similar attacks is required. As part of this exercise, a preliminary analysis of Outer Containment (OC) of TAPP-3&4 is carried out, to demonstrate, that, in case of an aircraft impact, the containment integrity continues to provide proper ra...

An attempt has been made to study the structural response of calandria vault (CV) supporting the calandria endshield assembly (CEA) of pressurized heavy water reactor (PHWR). The entire structure has been considered as a multi-degree of freedom system with coupled and uncoupled CEA with CV. It has been found that the acceleration level at the point...

With the increase in number of analysis and design softwares, usually a designer tends to make a complex model of the building by modelling secondary beams, slab panels etc., which is subjected to both static and dynamic loads. The temptation of using such a model is since analysis and design for various loads and load combinations can be carried o...