Transcript Operating Feedback - Nuclear Energy Agency

Operating Feedback
The Use of Operating
Experience by AVN
J.J. Van Binnebeek - AVN
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Responsibility of OEF activities
• Responsibility for OEF=Licensee
– Analyse national & international events
–  detect & prioritise according to
significance
–  detect precursors of severe conditions
–  detect emerging trends
– Applicable Lessons Learnt to their plant
–  reports
– Prevent occurrence or recurrence
• International reporting= AVN
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Purpose of AVN’s OEF process
• RB (inspection) activities:
– Verify adequacy of OEF process by licensee
– Enforce actions in case of deficiencies
• AVN’S EOF process
–
–
–
–
Support inspection process (particularly in OEF)
Analyse events (BE+ international)
Identify safety relevance for BE
Propose actions to Inspection group (incl.
Enforcement)
– Select BE events candidate to international reporting
– QS process
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Data sources used by AVN
• BE
– Inspection or expertise reports
– Reports by licensees
• International
–
–
–
–
–
–
IRS
IRSRR
FINAS
Official publications a.o. by USNRC
WGOE (+ other international WG)
Any other reliable information source
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Screening & selection of events
• Specific teams for BE or international OEF
• Basis:
– Safety relevance, adverse trends & lessons learnt
• Root causes: technical + HOF
• Engineering judgement  experienced people
• BE:
– Criteria  Fiche
• International
– Mainly oriented toward BE applicability
– Specific factors considered (generic, BE similarities,
prior occurrence in BE, applicability of LL)
• Databases
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Event Analysis
• Applicability of Lessons learnt to
the various BE plants
– Potential occurrence & effects
– Possible enforcement actions
– Quarterly reports
– Lessons Learnt & potential
applications to other plants
– Actions towards other plants decided
by ad-hoc committee
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Event analysis
• BE events
– Assessment of Quality of reporting,
Root cause analysis & corrective
actions by licensee (Inspectorate)
– PSAEA analysis on selected events
• Yearly screening
• Analyses
• Reports  results to licensees
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Event analysis
• Foreign events
– More in-depth analysis whenever
needed
• Confirming potential applicability
• Concerned licensees  requests
• Cross-references
– Follow-up
• Assess answers to requested actions
• Frameworks for further treatment (PSR,
…)
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Overall results for AVN
• Creation of overall expertise
– For inspectors (knowledge of events
& of their importance)
– Build–up of inspector & experts
knowledge
• Necessity to make R&D to improve
EOF activities
– Analysis methods (root causes , HF)
– PSA applications (PSAEA)
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Monitoring of the licensee EOF process
• Monitoring fed by created inspectors’
expertise
• Continuous monitory
– Observations during inspections
– Observations at the occasion of an event or
of the publication of a foreign EOF situation
• Specific monitoring
– Thematic inspection of the EOF process
– Overall process structure assessment
– Assessment of outcomes
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
AVN EOF Process requirements
• On-line & timely results
• Quick element to push the licensee
when needed
• Parallel sampling analysis to check
the licensee’s process
• Need for pro-activity, anticipation
• Quick feedback reactions
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Specific cases
• Sump Clogging
– Example of inadequate licensee’s process
– Need for AVN pushes
– PSAEA analyses evidencing initiators /
sequences not expected by safety cases
• Mid-loop events
– Success of PSAEA to show the seriousness
of a problem not recognised otherwise
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Specific cases
• Vessel head:
– cracks (USNRC Order EA-03-009)
– Discussion on NDT examination frequency
• Grid reliability
– Requirements from AVN based on a combination of
requirements from USNRC (GL 2006-02) and from
WANO (SOER 1999-1) adapted to the Belgian
context
– OEF related to installations not under the current
responsibilty of Licensee -> contractual relationship
with owner of the grid
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Specific cases
• Pressure Locking
– Early enforcement of NRC Bulletins
– Full analysis and improvement
programme by licensee
– Actual realisation not fully
satisfactory (Still Pressure locking
cases discovered!)
–  Question on the achievement of an
actual solution of the problem
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006
Conclusions
• RB EOF activities to cover Licensee’s
EOF process
– organisation
– monitoring
• Independent screening of national &
foreign events (incl. Studies) to
– Increase expertise
– Verify licensee’s EOF process quality
– Be sure important precursors or safety
issues are not missed
Topical Condference on Operating Feedback-Cologne 2006
29/05/2006