cheating in nuclear safety: 2015 czech dukovany lesson · 2015 czech dukovany lesson. czech npps 1....
TRANSCRIPT
Radiographs and welds reinspectionsafter 10 years of collective cheating
All Czech NPPs underwent total radiographs and welds
reinspections since 2015
Robust financial impact about 1bn EUR
Governmental blind eye on years of cheating
Legal actions so far inefficient, all key personnel still in charge
Credibility of nuclear industry and the regulator destroyed
Dukovany radiographs inspection - beginning 06/2015 – unit 4 shutdown to repair a leak on the ultimate emergency feedwater
nozzle into the steamgenerator No. 43 (not radioactive medium), nozzle
repaired
radiographs inspection – actions
Backward analyses: nozzle was inspected and evaluated as a free of
defects during outage in 2014 (contractor)
Decision to reevaluate quality of the welds radiographs (sample)
09/2015 decision to perform a comprehensive re-evaluation of all
radiographs since 2007 and consequent safety evaluation (thousands
radiographs per unit; > 90% radiographs of impulse lines)
The same approach applied in Temelin NPP
“immediate and longterm systemic corrective actions”: official line
ČEZ cancelled contract with contractor involved and transferred relevant
activities to CEZ group company UJV Rez
multilevel surveillance established (included independent expert
organizations, e.g. TUV)
long term reinspection program based on graded approach established
for both NPPs
many organizational changes in NPP departments, engineering
department, safety department etc. (including human resources
enforcement)
process changes in relevant areas
…
It all started in 2007
2 programmes to get bonuses for CEZ managers:
• Bezpecne 15 TERA v Temeline• Bezpecne 16 TERA v Dukovanech
Outsourcing of critical functions to shorten outages –motivation to make fake NDT checks.
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Dukovany lesson
• one of the best VVER plant record (before 2015)
• lenient regulatory oversight
• complacent nuclear safety approach
• top CEZ managers no nuclear education/experience
• support of top brass from the government
• operator interlink with the regulator
• = TOTAL LACK OF SAFETY CULTURE
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