Publication Laka-library:
Complementary Safety margin Assessment COVRA N.V. (HABOG)

DateDecember 2013
Remarks Zie hier voor de Beoordeling stresstestrapport “Complementary Safety margin Assessment COVRA N.V. (HABOG)”.

From the publication:


Following the accident at the Fukushima nuclear power plant in Japan, the European Council declared
that “the safety of all EU nuclear power plants should be reviewed on the basis of a comprehensive and
transparent risk assessment (Stress test)”. This review was later expanded to nuclear installations other
than nuclear power plants. Based on this, the Ministry of Economic Affairs, Agriculture and Innovation
(EL&I) requested COVRA N.V. to perform an assessment of the safety margins of the HABOG facility
[1], based on the Belgian Stress test specifications as applied to their waste management facilities and
ENSREG specifications [2][3][4]. This request was implemented by COVRA N.V. as the
‘Complementary Safety margin Assessment’, which results are presented in this report. The approach of
the ‘Complementary Safety margin Assessment’ as proposed by COVRA N.V. [5] has been approved by
EL&I. The underlying report is in accordance with this proposal.

In determining of the scope of the Complementary Safety margin Assessment, the Belgian stress test
specifications [4] for nuclear installations as applied to their waste management facilities were followed.
The Belgian Stress test states “buildings and installations needed to be considered are buildings where
possible criticality can occur and/or containing sufficient activity in case of an initiating event with a
resulting accident scenario which may in theory give rise to a dose greater than 5 mSv outside the site”.

At the COVRA most of the radioactivity (> 99,9%) is contained in the HABOG. It is also the only
buildings in which spent nuclear fuel is stored. Calculations showed that the worst possible accident
scenario, concerned both design and beyond design accidents of all other buildings, results in a dose
below the criteria of 5 mSv outside the site [draft Safety Report 2013]. The design based accidents could
lead to a maximum dose of nearly 3 mSv, beyond design base accidents could lead to a maximum dose of
nearly 4 mSv. From this follows that the scope of the assessment is determining the complementary safety
margins of the HABOG.