RRFM 2009 Transactions - European Nuclear Society

O 75 Bignan.doc - DI - 6 / 10 20/02/2009
DESIGN BASIS
OPERATING
SITUATIONS
(CONVENTIONAL
DESIGN PLANT
CONDITIONS)
RISK LIMITATION
STUDY TO PREVENT
CORE MELTING
RISK LIMITATION
STUDY TO PREVENT
NON ACCEPTABLE
RELEASES
1. Normal conditions
2. Incidental conditions
3. Emergency conditions
4. Faulted conditions
5. Multiple failures
sequences
6. Severe accidents
Conservative
approach for
rules and
hypothesis
Best estimate
approach for
rules and
hypothesis
Safety goals for
operators, public
and environment
as a function of
the category
(respect of the
European
directive 96/29,
dated the 13th of
mai 1996)
Safety goals of
the 4th
category
ICPR 63 and
restricted aera for
commercialisation
of foods
RESIDUAL RISK
7. Severe accidents excluded by design
Verification of no risk
for cliff edge effects
• Compliance with internal and external hazards (e.g. fire, explosion, flooding, aircraft
crash, earthquake, etc.). It is checked that internal and external hazards do not lead
to more severe operating conditions,
• Compliance with specific requirements on radioprotection, waste management,
decommissioning, human factors, reliability (redundancy and the single failure
criterion, diversity, etc.), physical protection, facility flexibility (core changes), etc.
By applying the above-described methodology, the JHR design has the required quality to go
through each stage of the licensing process, as any new modern nuclear power plant.
3.3 JHR fuel description
The reference fuel for JHR is UMo fuel (~8 g/cc UMo