- The USA and Russia have investigated and trialled the use of
nuclear explosions for civil engineering purposes, though only one
significant construction resulted: a dam in Kazakhstan. A DAM MESS IN UKRAINE
- Russia has used nuclear explosions to extinguish major gas well fires.
- OR NATO ARMIE'S IS THE SAME PRINCIPLE
- Some 150 experiments spanned 1957-75 in the USA and 1965-89 in the USSR.
- PNEs will be banned under the Comprehensive Nuclear Test-Ban Treaty when it enters into force.
Following the military use of nuclear weapons in August 1945,
attention turned to harnessing nuclear power in a more controlled manner
for electricity generation. However, at the same time there was
considerable investigation and testing of peaceful nuclear explosions
(PNE) by both the USA and USSR.
From the outset it was realized that thermonuclear blasts (as
distinct from fission) would have the least potential for radioactive
fallout. However, along with early weapons tests, some PNE tests did
contribute to atmospheric radioactivity, and some test sites now pose a
radiological hazard.
Applications of PNEs
Possible applications for peaceful nuclear explosions include:
- Large-scale excavation to create reservoirs, canals and ports.
- Stimulating oil and gas recovery.
- Creating cavities for underground oil, gas or waste storage.
- Extinguishing gas field fires.
- Space propulsion.
- Interception of potentially dangerous Near Earth Objects (asteroids, etc).
- Recovering oil from oil shale.
- Energy production via molten fluorides underground producing steam for electricity.
- Breaking up copper and phosphate ore preparatory to mining.
Of these, the first four have been tested (and even applied in some
cases by the USSR) while the remaining five have been investigated but
not tested.
A total of 151 PNE experiments have been carried out by both the USA
(27) and the USSR (124 plus 32 tests that helped develop explosive
devices used in PNEs). No other country has ever carried out a PNE test
a and there are currently no moves towards a resumption of tests.
Some advocates claim that PNEs would be the most economically
feasible method of carrying out large terrestrial engineering projects,
and that they provide one of only a few feasible means of managing large
gas field fires and destroying chemical weapons.
USA: Plowshare Program
The Plowshare Program
was the name given to the main US efforts to promote and develop
nuclear explosions for peaceful purposes during the 1960s and 1970s,
concluding in 1975.
Project Plowshare was formally established in mid-1957 by the former
US Atomic Energy Commission (AEC). Later in the year, the AEC carried
out the first underground nuclear explosion at the Nevada Test Site –
the Rainier event, of 1.7 kiloton
c.
Results from this validated theoretical concepts and gave impetus to
Plowshare. In total, 27 PNE tests consisting of 35 separate blasts were
conducted between December 1961 and May 1973 in the USA as part of the
program.
Most of the Plowshare proposals were for large-scale civil
engineering projects involving massive earthmoving, specifically to
improve the shipping lanes linking the Atlantic and the Pacific. At
least one was intended to widen the Panama canal, another aimed to
create a new sea-level waterway through Nicaragua. Two other
geo-engineering proposals were for a harbour and a highway and rail
cutting. Other Plowshare proposals and tests sought in various ways to
exploit other applications listed above, particularly gas and oil
recovery.
From a scientific and engineering perspective the program was by most
accounts successful; however, economic viability was questionable and
no commercial operation involving PNEs has resulted in the USA or been
carried out by a US organization. Over time, scientists learned how to
shape charges to provide the desired engineering result and also almost
completely to eliminate the release of radioactive materials. However,
not all explosions proceeded as planned and in certain cases, notably
the Sedan blast (see below), significant radioactive releases occurred.
An early proposal was Operation Chariot, accepted by the AEC in 1958,
to build a harbour at Point Hope, Alaska to facilitate the transport of
coal and oil. The harbour was to be about a 1.5 km long and 0.8 km
wide. One scheme for its development involved the use of five chained
thermonuclear explosions. The plan was permanently shelved in 1962 due
to local opposition from the Inupiat Eskimos and conservationists
concerned about the health of the local ecosystem which the Inupiat
relied upon for food. The economic viability was also questioned.
In 1959 the Oilsands study looked at using a PNE for extracting oil
from Canada's Athabasca tar sands, and the Olishale study looked at
shattering oil shales to enhance oil recovery from them, this being
taken further in the 1967 Bronco study focused in Colorado. A 1971 study
looked a using a PNE to harness geothermal energy.
In 1963, the Caryall study on the use of PNEs to excavate a cutting
through the Bristol Mountains near Amboy was carried out by the
California State division of Highways and Santa Fe Railway. The 3.4 km
cut was designed to accommodate both the Interstate 40 highway and a new
rail line. About 22 nuclear explosions would have been required,
ranging in size from 20 to 200 kilotons, providing a total explosive
force of 1730 kilotons. The plan was cut from the US budget in 1965.
After Chariot, almost all excavation research to 1970 was then
focused on building a sea-level canal across the Central American
isthmus in support of the Atlantic-Pacific Interoceanic Canal Study
Commission to replace the Panama canal. As part of this project, six
cratering experiments were carried out at the Nevada Test Site over
1961-68, including Sedan described below. Part of the purpose was to
establish means to reduce radioactive contamination from such blasts.
PNE tests in the USA
The first full test of the Plowshare Program was Project Gnome, which
took place in December 1961, near Carlsbad, New Mexico, in a bedded
salt formation. International observers were in attendance. The device
was placed in a tunnel 360 metres underground and the resulting 3.1
kiloton blast created a cavity 20 metres wide and 50 metres high. The
explosion was supposed to be self-sealing, but a brief burst of
radioactive material was released. Some six months after the test, a new
access tunnel was drilled and crews entered to survey the results. They
found a blue, green and violet landscape of melted salt stalactites,
and the temperature of the cavity was still above 60°C.
The second PNE test under project Plowshare was also one of the
largest. The Sedan blast took place at Yucca Flat on the Nevada Test
Site in July 1962. It was a shallow underground explosion designed to
test the cratering potential of PNEs for the creation of artificial
lakes and reservoirs. A thermonuclear device was inserted 194 metres
into the desert alluvium. The resulting 104 kiloton explosion created a
dome 90 metres high which then exploded outwards displacing more than 10
million tonnes of material to create a crater 100 metres deep and 390
metres wide. Of all Plowshare nuclear tests, Sedan created the most
radioactive fallout. Twin dust plumes deposited radioactive material
downwind, with the highest concentrations in Iowa and South Dakota of
more than 0.22 gigabecquerels per square metre.
Three separate PNE tests were carried out to assess the ability of
nuclear explosions to stimulate gas production from low-permeability
formations. These were Gasbuggy (December 1967, New Mexico: 29
kilotons), Rusilon (September 1969, Colorado: 43 kilotons) and Rio
Blanco (May 1973, Colorado: 3 blasts of 33 kilotons each at depths of
1600-2100 metres using charges 195 mm diameter). Rio Blanco also marked
the end of the US PNE test program. It was already known that
conventional explosions could stimulate production of gas, and the use
of nuclear explosives just added to the overall force of the explosion.
While the level of gas production from the tests was less than expected,
it would have been sufficient to make the process commercially viable
if the resulting gas had not been considered too radiologically
contaminated by tritium for sale
d.
Starting with the Gnome test in 1961, Plowshare provided support for
scientific experiments, primarily as additions to weapons tests, to look
at the possibility of using these high neutron fluxes to produce heavy
transplutonic elements well beyond the end of the Periodic Table. The
ultimate goal was the use of multiple neutron captures to reach the
predicted 'island of stability' at element 114. Between 1962 and 1969,
Plowshare supported the design and fielding of five dedicated
experiments and 'add-ons' to some 10 weapons tests at the Nevada Test
Site in an attempt to reach this elusive goal. Certainly large
quantities of some heavy elements were produced, and traces were
recovered from the melt zone,
e.g. the actinides curium-250 and fermium-257.
USA: Other proposals for the use of PNEs
Not all US concepts for the use of PNEs officially came under the
banner of the Plowshare Program. A few other proposals, developed by
various organizations, include the potential use of PNEs for space
travel and energy production.
PNEs for space travel
Project Orion was the first serious attempt to develop the concept of Nuclear Pulse Propulsion,
i.e.
using nuclear explosions for spacecraft thrust. It was initiated by the
company General Atomics in 1958 and continued until 1965, though
impetus for the idea was largely killed off by the signing of the
Partial Test Ban Treaty
e
in 1963, which banned nuclear testing in space due to fears over the
effects of fallout. The basic concept was to detonate shaped nuclear
charges in space behind a spacecraft mounted with a pusher plate and a
shock absorber so as to transfer momentum. The principle was shown to be
robust, leading to both excellent thrust and impulse characteristics,
something quite rare for space propulsion techniques which usually trade
one off against the other. It was also well suited for large spacecraft
(about 1000 t) since significant mass was required to shield against
the effects of radiation.
Electricity from PNEs
One possibility of harnessing nuclear fusion as an energy source was
the suggestion of detonating small thermonuclear weapons in an
underground cavity and capturing the energy. The Pacer Project,
developed at Los Alamos National Laboratories during the mid-1970s,
investigated the design and operation of such a system. The original
proposal involved the use of low-yield hydrogen bombs, while subsequent
proposals advocated simpler fission devices. One variation of the plan
called for nuclear devices in the kiloton range to be detonated in an
underground cavity at regular intervals of about 45 minutes. The heat
would be captured by molten fluoride salts flowing down the chamber wall
which would then act as a heat exchange fluid producing steam to drive a
turbine for electricity. The early plan envisaged the blast chamber as
being inside a salt dome, but later developments called for a
fully-engineered vessel. The concept never developed past the planning
stage.
USSR: Nuclear Explosions for the National Economy
The USSR equivalent to the Plowshare Program was Nuclear Explosions for the National Economy. It comprised mainly Program 7,
Peaceful Nuclear Explosions for the National Economy.
Overall the PNE test regime was much larger than the US effort and
concentrated on a more diverse range of applications. Early support for a
comprehensive test ban meant that PNE testing didn’t get underway in
the USSR until 1965; it then continued right up to 1989, when a
moratorium on nuclear weapons testing was implemented. Like Plowshare,
the program was originally focused on excavation and oil and gas
recovery, but interest in other applications soon emerged.
In 1965, in cooperation with the Oil Production Ministry, Program 7
began field experiments directed at using nuclear explosions to increase
oil production, and also planning experiments in salt to produce
cavities. The nuclear weapons laboratory at Arzamas-16 near Gorky
initially played the major role in adapting military explosions to
peaceful applications.
Overall, some 124 PNE tests were carried out at sites throughout the
former Soviet Union (80 in Russia, 39 in Kazakhstan, two in Ukraine, two
in Uzbekistan and one in Turkmenistan)
f.
Five PNEs were used for construction of water reservoirs, 25 for
constructing underground cavities, mostly in salt and sponsored by the
Gas Production Ministry, 21 for stimulating oil and gas recovery, and
five for controlling runaway gas well fires. A further 30 or more tests
related to developing explosives, hence total of about 156.
Scientifically, Program 7 included 39 tests spread right across the
USSR sponsored by the Geology Ministry for deep seismic sounding of the
Earth's mantle, from 1971-88. There were also more than a dozen tests
over 1975-79 on transplutonic element production, sponsored by the
Ministry of Medium Machine Building (responsible for the Soviet weapons
program), all 180 km north of Astrakhan.
Chagan: water reservoir
One of the better known tests is the January 1965 test at Chagan, on
the edge of the Semipalatinsk Test Site in Kazakhstan. Designed to test
the suitability of PNEs for creating reservoirs, it was the first
experiment carried out in the Soviet PNE program and, at 140 kilotons,
the largest of any PNE test. The device was placed in a 178 metre deep
hole in the dry bed of the Chagan River so that the crater lip would dam
up the river during periods of high flow. The blast formed a crater 400
metres across and 100 metres deep with a lip height of 20 to 38 metres.
Subsequent to the blast, a channel was cut into the crater allowing it,
and the reservoir behind it, to fill up with water. Initially the
crater itself held 6.4 gigalitres of water and reservoir contained some
10 gigalitres, but subsidence later reduced this figure by about 25%.
Radiation dose levels in the 1990s were reported as about one hundred
times background levels at the lip of the crater, and the crater water
was about 100 times drinking water standard for radionuclides, though
100-150 metres away dose levels were at background level. It was
estimated that some 20% of the radioactive products from the test
escaped the blast zone, and some were detected over Japan. This resulted
in complaints from the USA, which thought the explosion was a weapons
test and in breach of the 1963 Partial Test Ban Treaty.
Kama-Pechora canal project
In 1965, another project became the primary focus of the Soviet
nuclear excavation program – the construction of a canal to divert water
from the Pechora River in the Arctic region into the Volga River basin
and Caspian Sea, which had been depleted over the preceding 35 years as a
result of climatic anomalies and municipal and agricultural uses of
water from the Volga-Kama River system. Water from the north would be
diverted through a 112 km canal into the Kama and thence south to the
Volga River and the Caspian Sea.
It was proposed to use nuclear explosives to dig the central 65 km of
the canal where it passes through higher elevations. This would involve
several hundred devices, firing up to 20 at a time, with aggregate
yield of up to 3000 kilotons. After initial successful tests – Tel'kem 1
& 2 – approval was given in 1969 to proceed with the project. The
next stage of the project involved a major thermonuclear test in 1971 –
Taiga – in saturated alluvial deposits at the south end of the route,
and showed that nuclear excavation would be unsuitable there. By the
mid-1980s, plans for the canal were abandoned.
Urtabulak: gas well fire
In 1966, a nuclear explosive was detonated at Urtabulak gas field in
Southern Uzbekistan in order to extinguish a gas well fire that had been
burning for almost three years and had resisted numerous attempts at
control. The gas fountain, which formed at pressures of almost 300
atmospheres, had resulted in the loss of over 12 million cubic metres of
gas per day through a 200 mm casing – enough to supply a city the size
of St Petersburg. Two 445 mm holes were drilled that aimed to come as
close as possible to the well at a depth of about 1500 metres in the
middle of a 200 metre thick clay zone. One of these came to within about
35 m of the well and was used to emplace the special 30-kiloton charge
which had been developed by the Arzamas weapons laboratory. Immediately
after the explosion the fire went out and the well was sealed.
This was the first of five PNEs used for this purpose, and all but
one was completely successful in extinguishing the fire and sealing the
well. No radioactivity above background levels was detected in
subsequent surveys of any of the sites.
Treaties governing the use of PNEs
Article V of the 1970 Treaty on the Non-Proliferation of Nuclear
Weapons (NPT) states that the "potential benefits from any peaceful
applications of nuclear explosions will be made available to
non-nuclear-weapon States Party to the Treaty on a non-discriminatory
basis."
g
Subsequent to the NPT, the Peaceful Nuclear Explosions Treaty is a
bilateral agreement between the USA and the USSR designed to allow the
investigation of the potential peaceful uses of nuclear explosions
without promoting weapons development. It was signed in April 1976, came
into force in December 1990
h and governs the use of PNEs until the Comprehensive Nuclear Test-Ban Treaty (CTBT) enters into force.
Under the PNE Treaty, no single explosion may be greater than 150
kilotons and no group explosion may consist of an aggregate yield
greater than 1500 kilotons. In addition, signatory parties are committed
to sharing information about explosions, allowing access to the blast
site and otherwise not hindering the verification process. The treaty
governs permissible underground nuclear explosions which may be carried
out for peaceful purposes. A major driver for establishment of the
treaty was the Russian desire not to be misunderstood in relation to the
Partial Test Ban Treaty
i
when constructing the Kama-Pechora canal project, which would have
involved many explosions (the US Plowshare Program being finished by
then).
Under the Comprehensive Nuclear Test-Ban Treaty (CTBT), the use of
PNEs will be prohibited. However China has consistently pushed for this
condition to be changed, and while it has signed (but not yet ratified)
the treaty, it has requested that the issue be reconsidered 10 years
after it enters into force. The CTBT opened for signature in September
1996 and will enter into force when all countries listed in Annex 2 of
the treaty have signed it
j.
Further Information
Notes
a. India claimed that its 1974 nuclear test was a PNE, but it was not part of any civil program.
b. The Plowshare Program name derives from a prophetic Bible passage
(Micah 4:3) about beating swords into plowshares as nations turn away
from warfare.
c. The force of explosions is measured in kilotons: the approximate
equivalent of one thousand tonnes of TNT, set by international agreement
as 4.184 GJ. For comparison, the Hiroshima bomb was about 15 kt,
Nagasaki about 25 kTON
d. There has been a resurgence of interest in drilling near the
Rusilon site. As of August 2009, there were 84 permits issued within 5
km of the site, 11 of which were within 1.5 km. Currently there is a 0.8
km radius imposition on drilling near the test site, but there is talk
of this being lifted.
A 2005 report from the US Department of Energy
(DOE) states that the radiation levels at the site surface and in the
groundwater has reduced to background levels. In contrast, the Gasbuggy
site is considered a contamination issue as radioactive material, most
likely tritium, has migrated through the bedrock.
g. Article V of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) states:
Each Party to the Treaty undertakes to take appropriate measures
to ensure that, in accordance with this Treaty, under appropriate
international observation and through appropriate international
procedures, potential benefits from any peaceful applications of nuclear
explosions will be made available to non-nuclear-weapon States Party to
the Treaty on a non-discriminatory basis and that the charge to such
Parties for the explosive devices used will be as low as possible and
exclude any charge for research and development. Non-nuclearweapon
States Party to the Treaty shall be able to obtain such benefits,
pursuant to a special international agreement or agreements, through an
appropriate international body with adequate representation of
non-nuclear-weapon States. Negotiations on this subject shall commence
as soon as possible after the Treaty enters into force.
Non-nuclear-weapon States Party to the Treaty so desiring may also
obtain such benefits pursuant to bilateral agreements.
h.
The Treaty between the United States of America and The Union of Soviet
Socialist Republics on Underground Nuclear Explosions for Peaceful
Purposes (the Peaceful Nuclear Explosions Treaty, PNET) was a companion
treaty to the Treaty on the Limitation of Underground Nuclear Weapon
Tests, also known as the Threshold Test Ban Treaty (TTBT), to cover PNEs
carried out underground. The TTBT was signed in 1974, but not ratified
until after the PNET had been agreed in 1976. Although both treaties did
not enter into force until 1990, both parties in 1976 agreed to observe
the limit of 150 kilotons
j. The CTBT will enter into force once all the 44 states listed in
Annex 2 of the treaty have signed and ratified it. Three have not yet
signed it: India, Pakistan and North Korea; and six others have signed
the treaty, but not yet ratified it: China, Egypt, Indonesia, Iran,
Israel and the USA.
PLOWSHARE IN UKRAINE RIGHT NOW,,,,,