STUDY OF THERMAL MAPPING FOR HEALTH MONITORING OF GAS TURBINE BLADE

International Journal of Research In Science & Engineering e-ISSN: 2394-8299
Volume: 1 Issue: 2 p-ISSN: 2394-8280
IJRISE| www.ijrise.org|editor@ijrise.org [38-44]
FUTURE PERSPECTIVES OF NUCLEAR POWER AS PRIMARY
ENERGY SOURCE. A REVIEW
Aakash Kumar1
1
Department of Material Science and Metallurgical Engineering,
Maulana Azad National Institute of Technology, aakki1431@gmail.com
ABSTRACT
This review work details the possibilities of nuclear energy of becoming the primary energy source to meet our
demand in a sustainable manner. Economic conditions have always been the considering part before selecting
any energy source to meet our ever demanding demands. Nuclear energy has been the most focused part of study
in the early twentieth century when scientists began to realize the capability of the nuclear energy. As the
development proceeded, the nuclear power growth slowed and almost stopped in the late twentieth century for a
variety of different reasons. Among them were the use of nuclear technology in weapons. The advancement in
nuclear reactor design and construction has boosted the employment of nuclear energy as the prime substitute in
the twenty-first century world. Use of electricity is increasing every second but the resources available for its
production is limited so sustainable measures are required to meet this need. One of the most important aspect of
using nuclear energy for meeting our needs is that it is found to be the lowest contributor to carbon dioxide
emissions, even compared to solar energy and wind energy. Apart from electricity production, these nuclear
power reactors can be used for the production of hydrogen on a large scale to reduce the load on fossil fuels as
they are limited sources available on earth. In the coming century and beyond, nothing will be more important to
human beings than electricity, clean water and food and nuclear energy will be the primary option to meet these
demands. Though nuclear power creates a primary option in it, but it must meet very critical requirements in
order to gain public and political support.
Keywords: Nuclearenergy, electricity,sustainable, nuclear reactors.
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INTRODUCTION
Scientific investigations in the 18th century led to the discovery of subatomic particles and both atomic and
nuclear structure. These advancement in atomic research led to the introduction of fission reaction. In 19th century
USA initiated “The Manhattan Project” to develop an atomic bomb to add the ultimate weapon to its weaponry
arsenal. It was just an effort to become a superpower. This accelerated the knowledge of harnessing nuclear energy
to produce enormous amount of energy. After the introduction of atomic bomb for mass destruction in World War
II, the Atomic Energy Commission was established for controlling and regulating nuclear energy throughout the
world. Later the International Atomic Energy Agency was established. Worldwide research and development efforts
led to the establishment of the first nuclear power plant [1].
Economic factors have been considered above all other considerations when selecting an energy source for
mass utilization. In the late 20th century the development and growth of nuclear energy was slowed for a variety of
reasons. In countries like France, United States and Germany, nuclear energy grew rapidly during the 1970s. One of
the most prime concerns being the continuous energy demands throughout the world problems confronting mankind
is the continuing strong growth in energy demand throughout the world, which must be reconciled with
environmental and climate change concerns [2]. But nuclear energy ran into problems in the 1970s because of public
concern over the radioactive waste it generates, and this concern suppressed the further expansion of nuclear power
[3]. Besides electricity generation, power reactors can be utilized for large-scale desalination and hydrogen
generation [4], [5]. Nuclear energy today avoids the emission of nearly two billion tons of greenhouse gases (GHGs)
each year, thanks to over 400 reactors operating worldwide [6]. Recent price hikes in fossil fuels and power
blackouts also emphasize our need for reliable, safe and cheap power, as is offered by nuclear energy when coupled
with effective and secure waste disposal. A particularly important role for nuclear power in the future will be its
links to the hydrogen economy [7]. The future could well be the Hydrogen Age. We show that a major reduction in

GHGs worldwide can be obtained by nuclear-electric production of hydrogen, thus alleviating their potential effects
on future generations. We also demonstrate a potential key synergism with renewable wind power in the hybrid
production of distributed hydrogen [8]. The interest is sparked by concerns about global warming and security of
energy supplies. Nuclear energy contributes only about 14% of the world‟s electric energy mixtoday, and as electric
energy contributes itself only about 16% to the end energy use, its contribution is essentially negligible [9]. Still,
nuclear energy is plagued already with a long list of unsolved problems.
THE ROLE OF NUCLEAR POWER
For these reasons, interest in nuclear power around the world is suddenly burgeoning. All the usual indications are
favourable:
1. Public opinion on nuclear power has shifted from negative or neutral to positive in many countries, as the public
recognizes the elephants in the room and the limited options to deal with them.
2. New plants are under construction or on order in several countries.
3. Around the world, more „„predecisional‟‟ activities are underway, including reviews by governments of their
nuclear policies, analyses by companies to determine if they want to build new nuclear power plants, and other pre-
licensing activities;
4. R&D efforts on advanced nuclear power plants and related technologies are increasing.
5. Number of international collaborative efforts, both on R&D and in other areas, has grown.
One of the most interesting phenomena has been the growth in the number of countries expressing interest in nuclear
power or taking proactive steps toward the building of new nuclear power plants [12]. There are several distinct
categories of countries now considering nuclear power or actively engaged in efforts to develop or increase nuclear
power in their countries.
1. Countries, like Japan and France that have always had national policies supporting nuclear power and have
continued to build nuclear power plants while interest in other countries stagnated. These countries have not
changed their direction, but in some cases, their efforts have gained new vitality; one example is the recent decision
in France to move forward with the construction of an EPR at Flamanville [13].
2. Countries, like the United States, where nuclear power development has been stagnant for many years. The
passage of the Energy Policy Act in 2005 and other recent actions in the US have generated a significant increase of
interest among utilities and other corporations in starting to build new nuclear power plants again, and many
activities are now underway to explore new nuclear power plants [14].
3. Countries, like Turkey, that previously considered and rejected the idea of building nuclear power plants. While
no decisions have been made to date, the interest in reopening such reviews, which were often controversial, is
significant [15].
4. Countries, like Vietnam, that have not seriously explored the use of nuclear power in the past, have now
announced their interest in doing so. The countries in the third and fourth categories include a number of countries
with characteristics that are very different from the developed economies that have supported most of the world‟s
nuclear power plants to date [16].
5. Even countries, like Sweden, that have official phase-out policies applicable to their operating reactors, may now
be considering the possible re-examination of those policies. Once again, this suggests a growing willingness to
reopen difficult and controversial decisions [17].
At present, it is difficult to provide a definitive list of all the countries contemplating new nuclear power, as some
have not as yet made their intentions publicly known, and new countries continue to express their interests [18].
THE CHALLENGES FOR NUCLEAR POWER
The challenges for nuclear power are fourfold:
• Nuclear power must first of all be economically competitive;
• Waste products fromthe nuclear fuel cycle must be manageable;
• Public must have confidence in the safety of operating nuclear power plants and associated supporting facilities;
• Weapon-usable materials must be properly managed and safeguarded to ensure that no material is diverted to
nuclear weapons. I now elaborate on each of these challenges.

Economics: Any power source must make sense in a competitive market. Nuclear power suffers from the fact that
each plant built in this country was one of a kind, with only a few exceptions. Further, each one had to be of best
possible construction to satisfy safety requirements, requirements which were continually being changed through the
early years of development. The designs resulted in increased capital costs and very large staffing requirements,
driving up the cost of electricity [19]. The cars of today are vastly superior in every respect, especially safety, to
those that preceded them. They are a great value. The same must happen with nuclear power. Smaller, modular
plants produced in factories are part of the answer [20]. Standardization of a few designs is another part o f the
answer. Surprisingly, cheaper and simpler can also mean safer.
Waste management: Management of nuclear waste is an issue dominated by emotional considerations. There are
many intense debate around the globe over employing interimstorage instead of permanent burial. Transmutation of
the waste, using reactors or accelerators is also being considered in most of the developing countries [21]. One thing
is clear: burning less than 1% of the available fuel and discarding the rest, as we currently do, is bound to create a
waste problem [22]. To this end, many nations are considering means to recycle long-lived components of spent
LWR fuel i.e., actinides into proliferation resistant reactors and fuel cycles that will fission those isotopes into short-
lived isotopes. We can expect other international initiatives to develop, such as deep-burn reactors and other
concepts that more fully use the fuel without requiring recycling [23].
Safety: The enemy of safety is complexity. Our nuclear plants have become increasingly complex, in part,
ironically, because of the addition of many safety systems. Although it is often more expedient to engineer a safety
fix with the addition of a new system, I think we need to return to the fundamental design of the reactor and take
advantage of the inherent physics to ensure that it will respond safely [24]. Likewise, it is possible to design a
reactor that will inherently decrease power after losing all electrical power, without requiring active safety systems
[25]. There are reactors operating in many countries of the former Soviet Union that must be monitored carefully to
avoid another accident on the scale of Chernobyl [26].
Proliferation of weapons material: A requirement for substantial growth of nuclear power is to prevent the
proliferation of material that could be diverted to use in nuclear weapons. This is probably the greatest fear of those
in the US who strongly oppose nuclear power, especially its use in developing countries. It is such an emotional
issue that there is talk about putting the genie back in the bottle, walking away from the technology [27]. The first
step is to burn down, to destroy, and to eliminate the excess weapons material that we currently have available.
Reducing the inventories will greatly assist in managing the material that remains. Simply speaking, if the remaining
material is locked away in reactor systems to be destroyed, it cannot be used for weapons [28]. And we need the
monitoring systems to make any attempt at diversion obvious to all [29].
REACTOR DESIGNS
The nuclear fission reactor produces heat through a controlled nuclear chain reaction in a critical mass of fissile
material. They are classified as follows:
• Pressurized Water Reactors (PWR) [30].
• Boiling Water Reactors (BWR) [31].
• Pressurized Heavy Water Reactor (PHWR) [32].
• High-Power Channel Reactor (RBMK) [33].
• Gas-Cooled Reactor (GCR) and Advanced Gas-Cooled Reactor (AGCR) [34].
• Liquid Metal Fast Breeder Reactor (LMFBR) [35].
• Aqueous Homogeneous Reactor [36].
Advanced reactor designs are under investigation and development. Some of these reactors are:
• The Integral Fast Reactor with a recycling spent fuel [37].
• The Pebble Bed Reactor, a High Temperature Gas-Cooled Reactor (HTGCR) [38].
• SSTAR, Small, Sealed, Transportable, Autonomous Reactor [39].
• The Clean and Environmentally Safe Advanced Reactor (CAESAR) [40].
• Subcritical reactors [41].
• Thorium-based reactors [42].
• Advanced Heavy Water Reactor [43].
• KAMINI, a unique reactor using Uranium-233 isotope for fuel [44].

Theoretical nuclear reactor designs currently under research are:
• Gas-cooled fast reactor: The gas-cooled fast reactor (GFR) system is a nuclear reactor design which is currently
in development. Classed as a Generation IV reactor, it features a fast-neutron spectrum and closed fuel cycle for
efficient conversion of fertile uranium and management of actinides. The reference reactor design is a helium-cooled
system operating with an outlet temperature of 850 °C using a direct Brayton closed-cycle gas turbine for high
thermal efficiency [45].
• Lead cooled fast reactor: Molten lead or lead-bismuth eutectic can be used as the primary coolant in a nuclear
reactor, because lead and bismuth have low neutron absorption and relatively low melting points. Neutrons are
slowed less by interaction with these heavy nuclei, (thus not being neutron moderators) and therefore help make this
type of reactor a fast-neutron reactor. The coolant does however serve as a neutron reflector, returning some
escaping neutrons to the core. [46].
• Molten salt reactor: A molten salt reactor (MSR) is a class of nuclear fission reactors in which the primary
coolant, or even the fuel itself, is a molten salt mixture. MSRs run at higher temperatures than water-cooled reactors
for higher thermodynamic efficiency, while staying at low vapor pressure [47].
• Sodium-cooled fast reactor: The sodium-cooled fast reactor or SFR is a Generation IV reactor project to design
an advanced fast neutron reactor. It builds on two closely related existing projects, the LMFBR and the Integral Fast
Reactor, with the objective of producing a fast-spectrum, sodium-cooled reactor. The reactors are intended for use in
nuclear power plants to produce nuclear power from nuclear fuel. [48].
• Supercritical water reactor (SCWR): The supercritical water reactor (SCWR) is a Generation IV reactor concept
that uses supercritical water (referring to the critical point of water, not the critical mass of the nuclear fuel) as the
working fluid. SCWRs resemble light water reactors (LWRs) but operate at higher pressure and temperature, with a
direct once-through cycle like a boiling water reactor (BWR), and the water always in a single, fluid state like the
pressurized water reactor (PWR) [49].
• Very high temperature reactor: The very-high-temperature reactor (VHTR), or high-temperature gas-cooled
reactor (HTGR), is a Generation IV reactor concept that uses a graphite-moderated nuclear reactor with a once-
through uranium fuel cycle. The VHTR is a type of high-temperature reactor (HTR) that can conceptually have an
outlet temperature of 1000 °C. The reactor core can be either a "prismatic block" or a "pebble-bed" core. The high
temperatures enable applications such as process heat or hydrogen production via the thermochemical sulfur–iodine
cycle. [50].
Other proposed ideas: The goal of these modifications is to achieve a higher power output requiring an excess
reactivity of 4% at maximum expansion of the bed.
• Kloosterman et al. (2001) presented a new type of nuclear reactor that consists of a graphite-walled tube partly
filled with TRISO-coated fuel particles. Helium is used as a coolant that flows from bottom to top through the tube,
thereby fluidizing the particle bed [51].
• Uchiyama et al. (2000) conceptually designed a multipurpose reactor named „„Nuclear Heat Generator (NHG)‟‟
which could be installed in an energy consuming area. The reactor of 1 MWt output is designed without any needs
for fuel exchange and decommissioning on site [52].
• Gimenez et al. (2003) presented a new methodology to perform nuclear reactor design, balancing safety and
economics at the conceptual engineering stage. This integral methodology takes into account safety aspects in an
optimization design process where the design variables are balanced in order to obtain a better figure of merit related
with reactor economic performance [53].
• Jahshan and Kammash (2005) introduced material and design innovations to reduce the mass and volume of an
established safe gas-cooled cermet reactor design so that it can be deployed as a multi-megawatt electric power
source for plasma thrusters including the laser accelerated plasma propulsion system[54].
• Mitenkov et al. (2005) presented the results of design analysis for improving nuclear plants with fast reactors,
specifically, by using cartridge-vessel generators instead of sectional-modular generators. Agung et al. (2006)
described several modifications to the design of a fluidized bed nuclear reactor in order to improve its performance
[55] [56].

INTERNATIONAL INITIATIVES
In this regard, it is useful to look at the number and range of multinational programs in place to deal with various
nuclear issues. Even looking just at multinational (as opposed to bilateral), government-sponsored (as opposed to
private sector) initiatives, at least six major programs can be mentioned. Five of them have started since the year
2000. Briefly, in order of initiation, the six are:
• NEA Joint Projects: each of these research projects involves a group of countries that have a desire to work
together in an area of research, and usually, to share a research facility located in one of the countries [57]. This
obviates the need for each country to duplicate the same type of facility and allows the countries to take advantage
of the expertise of all the members of that project [58]. There are over a dozen such projects underway at present,
and the oldest of these is about 50 years old. The NEA serves as the Secretariat for these joint projects and helps
coordinate the activities of each project. [59].
• Generation IV International Forum (GIF): This program, proposed by the US Department of Energy in 1999
and initiated in early 2000, is aimed at the joint development of a new generation of nuclear power reactors [60]. It
includes countries with a significant commitment to nuclear power and to nuclear R&D. NEA serves as the
Secretariat for GIF, and research efforts are beginning for several Generation IV design concepts [61].
• International Project on Innovative Nuclear Reactors and Fuel Cycle (INPRO): This project, proposed late in
2000 by the International Atomic Energy Agency (IAEA), involves well over 20 countries representing the full
spectrum of nuclear involvement, from active nuclear programs to none at all. Thus, most of INPRO‟s efforts to date
have addressed decision-making methods and infrastructure needs especially useful for countries adopting nuclear
power for the first time [62].
• World Nuclear University (WNU): WNU was inaugurated in 2005 with the first Summer Institute, a 6-week
program for nuclear students and young professionals to help broaden their view of nuclear issues. The Summer
Institute continued in 2006 and another is planned for 2007. Additional educational activities are anticipated in the
future.
• Multinational Design Evaluation Program (MDEP): This initiative was proposed in 2005 by the US Nuclear
Regulatory Commission for the purpose of coordinating reviews of new reactor designs. It consists of several
phases. The first phase currently involves the US, France and Finland and is focused on the EPR. The second phase
is a true multinational effort and was kicked off in 2006 with the selection of the NEA as the Secretariat and the
identification of several pilot efforts to test the feasibility of working together on licensing reviews.
CONCLUSION
While there are still uncertainties ahead, it seems quite likely at this point that, in the near-term, new
nuclear power plants will be built, both in countries that already have substantial nuclear programs and in new
countries. Thus, the number of countries with nuclear power plants will increase, and since some of these countries
have small grids and limited infrastructures, it is likely that smaller reactors will be used to meet some of these
needs. In the near-term, nuclear power growth will likely be met by existing technologies and those technologies for
which substantial development has already occurred. Nuclear power development will not be the only source of
power to meet growing energy demands and growing concerns about global warming.
In the longer term, more advanced nuclear power plants, such as the Generation IV power plants, will
likely be deployed. These will be able to meet a more diverse range of energy needs than the current generation of
large, centralized electricity-generating power plants can meet. Possible applications include process heat for
industrial applications, the generation of fuels such as hydrogen for transportation, and a variety of possible off-grid
applications.
However, most experts still would regard such an eventuality as very long term and not assured. Thus, in
the foreseeable future, the need for the development and deployment of more advanced versions of today's energy
production technologies will continue, and all promising technologies should be pursued. It is likely that different
technologies could be favoured in different circumstances. Globally, it appears that the world is likely to need
substantial new contributions from all sources, particularly those capable of supplying significant amounts of clean,
low-carbon energy. Nuclear power is one of the most promising of these sources.

ACKNOWLEDGEMENT
The author would like to thank the Dept. of Material Science and Metallurgical Engineering of MANIT Bhopal.
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