Chernobyl, its role during
past 30 Years and at present
Dr Volodymyr Tykhyy
Consultant, environmental management
Senior research fellow (retired), Academy of Sciences of Ukraine

Tykhyy - KURRI 10 Feb 20161

26 April, 1986:
Chernobyl NPP reactor #4 exploded
This happened when operator
pushed a “Shut Down” button
 Operators were accused ofsafety rules violation
 Reactor staff claimed thatreactor design was not safe,
but instructions to operators
did not contain this warning This presentation will not
attempt at clarifying the issueof who is guilty; this is a storyof 30 difficult years of mycountry after disaster

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First days, first reaction
We should distinguish what we know NOW, andwhat we KNEW at that time
 At that time we (the public) only knew thatsomething bad or very bad had happened at
ChNPP (real information was “secret”);
 What had been done right away (assessment
based on our present knowledge): Evacuation of Pripiat city in the afternoon of 27th

April was a very timely decision (45,000 people
evacuated); No warning to villages around ChNPP and to thecity of Kyiv until beginning of May – was very bad
decision; very high AVOIDABLE doses were received
by population
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First days, first weeks
It was not clear, what physical processes go on in
the reactor; there was fear that reactor bottom
would be destroyed, and all fuel will explode There was an idea that graphite is burning Now it is believed (not all agree!) that after firstmelting of nuclear fuel, local criticality was achieved
from time to time and hence local nuclear
explosions occurred; by these explosions almost allgraphite and fuel (and r/a substances!) werethrown away from reactor by 7 May 1986
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Damaged reactor # 4 of Chernobyl NPP (reactor
is now covered by “Shelter”, or “Sarcophagus”)

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First weeks and months, evacuation
27 April – Pripiat city evacuated by 5 May: villages and towns around ChNPP
evacuated – about 10,000
 summer of 1986: all 30-km exclusion zone
evacuated (Ukraine and Belarus)
 by the end of 1986 – total of 91,000 people
evacuated (Ukraine) by the end of 1991 - about 59,000 people
independently moved from contaminated areas(Ukraine)Tykhyy - KURRI 10 Feb 2016

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ChNPP: first period after the accident
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First months: emergency measures at damaged reactor; workin areas/buildings with high radiation, hundreds ofthousand of civilian and military obtained very high doses
October 1986: reactors #1 and #2 of ChNPP restarted.
December 1986: a shelter over damaged reactor “Sarcophagus” built
1987: twin-city of ChNPP - Slavutych built, personnel of
ChNPP moved from Kyiv to Slavutych
December 1987: reactor #3 restarted (NB: decision torestart reactor #3, located on the same site with damaged
reactor #4, was highly criticized, because it required immense
works to separate communications in very high radiation)
1991: reactor #1 stopped forever after turbine fire
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Excessive irradiation of people:
Many people in affected areas were not properly
informed (there was even 1-May parade in Kyiv)
 After the secrecy around Chernobyl disaster was
lifted, data about high doses and numerous casesof acute radiation syndrome among people fromvillages and towns around ChNPP were reported; Extremely high doses were received byparticipants of liquidation of disaster at ChNPP liquidators (over 600,000 participated during firstweeks and the following years, from all USSR)

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Country context: USSR, 1985-1991
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Export revenues fell due to sharp fall of oil prices (1985)
Huge expenses, military losses and frustration during
Soviet war in Afghanistan (79 - 89)
Huge expenses caused by Chernobyl disaster (86-90)
In January 1987 Soviet leader Gorbachev launched theprocess of reforms – perestroika, which opened the door
to glasnost, thus public and political activity became
possible after years of suppressions

Perestroika revealed economic decline of the country anddisillusionment of peopleAugust 1991: Unsuccessful Coup d’etat in Moscow - andsoon disintegration of the USSR (December, 1991)
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1986-1991, Conclusions (Ukraine)With great efforts and sacrifices damaged reactor was
isolated, and three other reactors restarted
 1986-1990: “Business as usual” in atomic industry of
the USSR – 6 new reactors commissioned in Ukraine

August 90: Ukrainian Parliament passed a 5-year
moratorium on further development of nuclear
energy (lifted in 1993)

Key law providing compensations and benefits for
Chernobyl sufferers passed
 Ukraine became independent country and since 1992
all burden of Chernobyl-related measures fell on
Ukrainian people, politicians, budget and economy
Tykhyy - KURRI 10 Feb 201612

1986-1991, Conclusions (international)
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Significant slow-down of nuclear energy growth (in September
1990 Switzerland voted for a 10 year moratorium)
International community (IAEA, WHO) accepted Soviet version that disaster occurred because of safety rules violation; in thisway, the damage to reputation of Western nuclear industry was
minimized
During first years, WHO/IAEA was not involved into research
work on health consequences of Chernobyl disaster;international organizations simply supported Soviet prognoses
Only in 1990 an International Chernobyl Project was launched,but it’s conclusion in 1991 was: “There were significant nonradiation-related health disorders… due to anxiety and stress ”(NB: very questionable)
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InternationalPowerful public protests against nuclear energy inmany Western countries (Germany, Netherlands,
Sweden, UK etc.); “Green movements” gained
momentum
Many countries and NGOs provided humanitarian
aid to liquidators and sufferers (treatment in
hospitals, sanatoria, medical consultations,summer holidays for children etc.)
During 1990s, a lot of various diseases and deaths
among liquidators were reported; it is hardly
possible to prove for sure which were definitely
caused by Chernobyl.
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Personal experience (1)
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86, May-July: Modeling contamination of Dnieper river with
r/a fallouts (the team was later awarded National Prize)
86-89: Field investigations of r/a contamination in the 30km zone and the town of Poliske (“participant of liquidationof consequences of Chernobyl disaster”)
89-90: Investigation of damages to cells by heavy particles(irradiation at cyclotron was planned)
88-93: Active member of NGOs - “Greenworld” andGreenpeace; protests again Chernobyl secrecy
91-93 Director of “Greenwold”/Greenpeace laboratory
conducting investigations in contaminated areas
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Personal experience (3)Left: November, 1989, city of Korosten, Zhytomyr province,
Ukraine. Rally against Chernobyl secrecy
Right: December, 1989, Moscow. Signatures against Chernobyl
secrecy are passed to MPs of the Parliament (Supreme
Soviet) of the USSR
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Personal experience (4)Left: 1991 “Greenworld”/Greenpeace lab near ChNPP
after the hydrogen explosion and fire at ChNPP unit #1
 Right: 1992, results of investigation of intake of r/a
substances with food in Stepanivka village, Zhytomyr
provinceTykhyy - KURRI 10 Feb 201618

Personal experience (5)Over: 1990, meeting with
Minister of Health to discuss
humanitarian aid project
proposed by Munich University
 Right: 1992, sampling bottom
sediments at Kyiv reservoir
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How many people had suffered from
Chernobyl disaster?
Categorization of sufferers (those who lived/lives in affectedareas) was based on surface density of contamination of thearea with r/a substances (not on expected doses fordifferent groups)
 Participants of clean-up works at ChNPP (liquidators):Worked in 1986-1987 (category 2) and in 1988-1989 (category 3)

3,096,814 – total number of sufferers (2002), of them:

1,048,628 children:

336,000 clean-up workers (liquidators);
 96,000 persons with established (?) causal connection withChernobyl.
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In 2002, 13,027 families were receiving
compensation due to loss of provider
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1991-2000: Ukraine under pressureIn 1991-2000, after Ukraine became independent, it took
responsibility for financial and other burdens ofliquidation of consequences of Chernobyl disasterIn the beginning of 1990s, several highly populist laws
for protection of sufferers were passed: they establishedpayments for very low risks and they did not havetime limits
 Special commissions were established to document“causal relation” of diseases with Chernobyl (Order of
MoH of 1997). Not only ARS, cancers and thyroid
pathologies, but a list of other 60 diseases in 7 groups However, scientific justification of this list was not clear,and many commissions were corrupt.


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Ukraine budget expenditures, million USD

On average, after 1999 only 25-27 % of funding
required by Law was allocated in the budget
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Economic lossess of Ukraine as a result ofChernobyl disaster (as estimated in 2010)

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Thyroid data, (“National Report of Ukraine”)(published in 2006)
400

Annual number of thyroid cancer

Thyroid cancer in Ukraine
1986～2004
300

15-18 yr at the time of accident
0-14 yr at the time of accidxent
200

100

0

1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
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Number of adults who underwent thyroid gland
surgery at the Kyiv Institute of EndocrinologyUpper graph: benign tumors
Lower graph: malignant tumors

These data were firstpublished only in the
beginning of 2000s.
As Prof. Komissarenko(Head of the Surgery
Division of the Institute)
explained, there was no
information on whereoperated patients lived orworked or what doses they
may had obtained after
Chernobyl disaster.
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Thyroid cancer
Total number of thyroid cancers recorded in the National
Registry of Ukraine during 1986-2009 - 6448
 WHO, 23 April 2011: Radiation dose exposures to thethyroid were particularly high in children and adolescentsliving in Belarus, Ukraine and affected regions of theRussian Federation. By 2005, more than 6,000 thyroid
cancer cases had been diagnosed in this group. It
is most likely that a large fraction of these thyroid
cancers are attributable to radioiodine intake.
 WHO: Furthermore, it is expected that increases inthyroid cancer incidence due to the Chernobyl accident
will continue for many more years, although long-term
increases are difficult to quantify
Tykhyy - KURRI 10 Feb 201626

1991-2000 Chernobyl and international science

IAEA/WHO : “number of non-specific health effects

other than cancer among exposed populations, andparticularly liquidators, have been reported… However,
if real, they might also reflect effects of stress andanxiety“.
 Western science often rejected reports published in the
USSR and post-Soviet countries: “they were in foreign
language, not peer-reviewed, biased etc.”
 In fact, it is difficult to judge, because in the equation
N=D*Q(D/E) we do not know doses: measurements
and reporting of doses were extremely bad. In reality,
doses D might had been ten times higher than reportedby the USSR.
 Anyway, “stress and anxiety” produced similar effects,
and they were also result of Chernobyl
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1991-2000, ChNPP under pressure
1992 - negotiations began between Ukraine andWestern countries: West wanted shutting ChNPP
down, Ukraine demanded financial compensation(shutting down was a huge economic loss) A special fund managed by EBRD was established;in 1997, a list of facilities to be funded by the West
was agreed (spent fuel storages, New Safe
Confinement, monitoring) American Government funded construction of thepower plant to provide heat and electricity to
ChNPP (June 2001)
 15 December, 2000: last operating unit #3 of
ChNPP was turned off forever.
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Chernobyl and international nuclear
energy development, 1991-2000
Closure of ChNPP was due mainly to political pressure
from the West on weak Ukrainian government (15RBMK reactors are still in operation in Russia!)
 In 1994, the Dutch Parliament voted to phase out
nuclear energy; in 1997, the Austrian Parliament Green movements became very strong in European
countries, using anti-nuclear rhetoric and Chernobyl
disaster as an argument
 At the end of 1990s, Green parties entered governmentsof Belgium and Germany; with their pressure, Belgium
decided on phasing out nuclear energy in 1999, andGermany in 2000
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After 2000: Chernobyl problems
Chernobyl legislation does not have any time limits,so number of sufferers has been going up every year Crisis of payments of Chernobyl pensions andpayments for medicines: number of pensioners andpeople with approved “causal relation with Chernobyl
accident” increased many-fold, there was no money inthe state budget; lawsuits followed (several billion UAH)
 Parliament has been making only small changes to thelaw (20 amendments in 2000-2015!)
 Law of 28 December 2014: “zone 4” liquidated; authority
for establishing rates of additional pensions and medical
payments delegated to the Cabinet of Ministers “to beallocated in accordance with available budget”
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ChNPP and exclusion zone nowFor Ukraine: site for spent nuclear fuel storages;

 employment for ChNPP personnel (decommissioning,

maintenance)
 very complicated task of managing the 30-km zone
(e.g., to reduce risk of forest fires, EU funded 1.7 MW
incinerator for r/a contaminated wood) President of Ukraine ordered creation of nature
reserve in 30-km zone in 2016

For international atomic energy community: testing range for new technologies of NPP

decommissioning (New Safe Confinement etc.)

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New Safe Confinement

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Chernobyl and international nuclear energy
industry after 2000
New start for nuclear energy projects:
 2004 – Finland EPR (not yet in operation; 3.9 billion

Euro over the budget) In the USA - 2005 Energy Policy Act: incentives forestablishing new-generation power reactors, first four
AP1000 reactors are under construction plus e.g.:
 China: 30 reactors in operation, 24 under construction
and more planned; China has become largely selfsufficient in reactor design and construction

After 2011, Fukushima took the place of Chernobyl

in international discourse on the nuclear energy future;climate change issues are also seriously considered.
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Thank you for your atteention!

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