ASN Report 2015

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Whatever the notification area, several of these events,
which are similar in the NPPs or are the result of common
causes, are together referred to as Generic Significant
Events (ESG), 15 of which were notified in 2015.
The number of ESS notified is slightly down by
comparison with 2014 (- 8%).
The number of ESR also fell by about 7%by comparison
with 2014. A level 2 ESR on the INES scale was however
notified (see box page 398).
The number of ESE fell significantly compared to 2014,
by nearly 30%. This reduction is partly explained by the
exceptionally high number last year, owing to problems
with management of devices containing coolant fluids.
EDF is in the process of carrying out modification work
on the chillers in all the reactors in service, in order to
minimise these emissions, which could be the reason
for this improvement.
The details of the significant events for each site are
presented in chapter 8.
GRAPH 7: Gaseous radioactive discharges for the NPPs in 2015
Blayais/2 Bugey/2 Chinon/2
Cruas-Meysse/2
Dampierre-en-Burly/2
FessenheimGravelines/3
Saint-Laurent-des-Eaux
Tricastin/2
Belleville-sur-Loire
Cattenom/2Flamanville
Golfech
Nogent-sur-Seine
Paluel/2
Penly
Saint-Alban
Chooz Civaux
0
2
4
6
8
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Activity discharged (TBq) Activity discharged (GBq)
Halogens and
aerosols (GBq)
Gases (TBq)
4.2 Evaluation of the manufacture
of nuclear pressure equipment
Advancing industrial practices
ASN observes that the justifications and demonstrations
provided by the manufacturers with regard to the
regulations applicable to nuclear pressure equipment are
still regularly unsatisfactory. As of the first half of 2015,
EDF and Areva therefore took fundamental measures to
change their practices and bring them into line with the
regulatory requirements. ASNmonitored thesemeasures,
most of which were carried out within the framework of
the French Association for NSSS design, construction
andmonitoring rules (Afcen) and involved the majority
of the profession. ASN considers this approach to be a
positive one, but will be attentive to ensuring that it is
seen through to completion.
The Areva NP plant in Le Creusot
In 2014 and 2015, ASN was also informed of several
manufacturing anomalies in the Areva NP plant in
Le Creusot. ASN asked Areva NP to conduct a general
quality review of past and present nuclear activities
in this plant in order to obtain an overall picture of
the pertinence of the organisation and practices at
Creusot Forge, the quality of the parts produced since
manufacturing started for the Flamanville 3 EPR and
As there can be a different number of reactors on each site, the results are given “per pair of reactors”, to enable a comparison to be made from one site to
another. This for example entails:
• keeping the results as-are for the Golfech site, which has two reactors;
• dividing by two those of Chinon, which has four reactors (Chinon/2);
• dividing by three those of Gravelines, which has six reactors (Gravelines/3).
409 CHAPTER 12: EDF NUCLEAR POWER PLANTS (NPPs)
ASN report on the state of nuclear safety and radiation protection in France in 2015