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Status of decommissioning
activities of Italian Nuclear Power Plants (Italian
NPP) Following
the government’s decision for a prompt decommissioning of four Italian
plants by the end of 2020, Sogin proceeded to modify the pre-existing
programmes which considered the safestore strategy and the dismantling
after a period ranging between 40 and 50 years.
The new programmes have been developed in accordance with a logical
sequence which calls for continuation of the activities already
underway on uncontaminated systems or systems with low contamination
levels.
On the basis of these new programmes, the complete decommissioning of
the plants is planned as follows: Garigliano and Trino by the end of
2016, Caorso by the end of 2017 and Latina by the end of 2019.
The schedule takes into account the construction and subsequent
availability of the national repository radioactive waste (this task
is not in the responsibility of Sogin).
The decommissioning programme considers three main phases:
- the first phase, until year
2005 (the date now planned the beginning of the construction of the
national repository), during which activities are carried out in
such a way to ensure that a possible delay in the construction of
the national repository would result in limited additional costs.
The amount of waste produced is sufficiently low and, if necessary,
can be managed on site with the procedures, resources and tools
presently available; main activities are on non-contaminated (or
very low-contaminated) systems and on conditioning of operating
wastes.
- the second phase, from 2006
to 2008 (the date now planned for the completion of the national
repository): this phase involves activities carried out in
preparation for the decommissioning of the nuclear island. Possible
delays in the construction of the national repository could result
in more significant additional costs.
However, the waste produced during this period can still be managed
on site.
- the third phase, from 2009
onward, involves the actual decommissioning of the nuclear island
and a delay in the availability of the national repository would
necessarily result in the postponement of related works and in
additional significant costs, also largely due to the extraordinary
"on site" management of waste.
Main activities and status of
decommissioning for the four plants are briefly outlined below:
- Caorso
The reactor has been defuelled and the fuel is now stored in the
pool of the plant.
An "on site Interim storage" will be realised by 2004. On August
4, 2000 the Ministry of Industry issued a Decree authorising the
following decommissioning activities (for other activities the
presentation of a global decommissioning plan is required within
one year from the above cited Decree and has been presented on
august 3rd, 2001):
- dry storage of irradiated fuel
- dismantling of the turbine and
Off-Gas
- dismantling of the RHR towers
- decontamination of the main
circuit
- treatment of previously produced
waste
Planning activities together with
on-site preparatory activities have continued, mainly operational
wastes treatment and conditioning and the revision of the radiological
inventory of the turbine.
Main activities are devoted to selection and preparation of
technologies and systems needed in the future.
- Garigliano
The Garigliano plant was near to reach the safestore condition
when the changement of strategy occurred. The reactor is
defuelled and no fuel is now on the site.
The radiological characterisation has been completed and safe
enclosure of reactor building and turbine building were achieved
in the past. All operating wastes have been treated; no more
necessary radwaste tanks have been dismantled and modification
of the system for decommissioning are in progress.
The global decommissioning plan with the new strategy has been
presented to initiate the decommissioning licensing procedure on
august 3rd, 2001.
- Latina
The reactor is defuelled and no fuel is now on the site. The
global decommissioning plan with the new strategy will be
presented to initiate the decommissioning licensing procedure by
the end of 2001.
The radiological characterisation has been completed and the
decontamination of the spent fuel pool is achieved. Previously
produced waste has been super-compacted. It is expected to get
shortly the approval to the dismantling of the primary conduits.
- Trino
The reactor has been defuelled and the fuel is now stored in the
pool of the plant (and in another pool on a nearby site).
An "on site Interim storage" will be realised by 2003. The
global decommissioning plan with the new strategy will be
presented to initiate the decommissioning licensing procedure by
the end of 2001.
The dismantling of non nuclear components and systems no longer
considered necessary and removal of asbestos in the turbine
building are ongoing.
source: European website on
Decommissioning of Nuclear Installations
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