Introduction to ENUM Domain Pulse Vienna, February 4th, 2005
4th CNS Review Meeting, Vienna, 15 April 2008
description
Transcript of 4th CNS Review Meeting, Vienna, 15 April 2008
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
4th CNS Review Meeting, Vienna, 15 April 2008
4th Review Meeting of theConvention on Nuclear Safety
SLOVENIACountry Group 6
Vienna, NH Hotel, 15 April 2008
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Outline
• Nuclear Safety 2005-2008
• Legislative arrangements
• Regulatory supervision
• Issues from 2005 (Follow-up)
• Questions 2008
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Nuclear Slovenia
NPP KrškoTRIGA
Mine
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Slovenia, the smallest nuclear country
We have everything the big country has …
… but we have to manage it with less resources!
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Nuclear Facilities
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP
• Westinghouse PWR• 2 loop• 700 MWe• Commercial operation
since 1983• Ownership 50:50
Slovenia-Croatia
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Operation
• Without major problems• Last reactor trip in 2005• 18 month fuel cycle
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Performance Indicators
Load Factor
0
20
40
60
80
100
120
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
avg.
year
[ %
]
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Performance Indicators
Electrical Energy Production
0
1
2
3
4
5
6
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
avg.
year
[TW
h]
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Performance Indicators
Number of Reactor Trips
0
2
4
6
8
10
12
14
16
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
avg.
year
num
ber
of s
hutd
owns
Manual Auto
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Performance Indicators
Collective Dose
0
500
1000
1500
2000
2500
3000
year
[man
mS
v]
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Performance Indicators
Unavailability of Auxiliary Feedwater
0,000
0,001
0,002
0,003
0,004
0,005
0,006
0,007
0,008
0,009
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
avg.
year
unav
aila
bilit
y
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: International Reviews
• OSART Follow-up (November 2005)
• Overall impression was positive. – Majority of issues fully resolved.– Commitment for improvements,– Priority remains on nuclear safety at all levels,– Effective use of computer technology.
• Areas for improvement:– Industrial safety should be improved.– Volume and storage of low level waste.– Enhancing the use and adherence to procedures in the
field.
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Issues
• Extension to 18-month fuel cycle– Foreseen already in 2000 during SG replacement– New fuel with 1.4X IFBA burnable absorbers– 2004 – first extended cycle was 19 months long– Only few operational problems with fuel leaks– Increase in tritium production
• Emergency preparedness exercises:– Annual exercises in the Krško NPP with the participation
of the SNSA– Slovenia participated in “CONVEX-3” exercise in May
2005 organized in the Cernavoda NPP
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Finances
• Operator must ensure sufficient financial resources throughout the operating lifetime.
• Owners of Krško NPP are approving 5 years investment plan
• No problems with any delayed payments in recent years.
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Human Resources
• Krško NPP staffing– Approaching the period of retirements– Active employment policy– Currently 570 staff members– No plans for bigger reductions
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Human Resources
• Systematic Approach to Training• Retraining of licensed personnel (typically 4 per
year), two-year cycle of requalification training • Full-scope replica simulator:
– Abnormal Operating Procedures validation– Unusual events analysed, corrective actions proposed – Validation of some scenarios in the scope of the Periodic
Safety Review recommendations in 2006
• Training for subcontractors (General Employee and Radiation Protection)
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Human Resources
• Training for specific areas: Refuelling Operations, Maintenance, Engineering, Radiation Protection, Chemistry, Security, Emergency Preparedness
• Maintenance training centre• SNSA and TSO training:
– two months of initial training on nuclear technology in Ljubljana,
– the US NRC Training Center in Chattanooga, USA,– the Krško NPP - classroom training and simulator
training,– international courses and workshops
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: QA and Safety Culture
• QA and ISEG merged• “Quality and Nuclear Oversight Division”
responsible for :−Design Modification Control, Procurement
documents control, QA review of Plant Procedures, Document Control, Procurement control, Control of special processes, Inspection control, Audits,
−Self-assessment program, Safety culture oversight, Human performance oversight, Operating experience oversight, Corrective Action Program
• Safety Culture review
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Major modifications
• Computer program PAD 4.0 for fuel elements design basis calculation.
• Beacon-TSM application as a Power Distribution Monitoring System (PDMS).
• Replacement of a traveling screen for the service water pump suction.
• Replacement of fire alarm annunciators, pipelines, isolation valves and the hydrant on the fire protection system.
• Replacement of the central alarm system. • Old 10 kV distribution grid replaced by a 6.3 kV
house grid.
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Major modifications
• Replacement of the water pre-treatment and the water treatment system.
• Installation of a super compactor,• Installation of a preheating and pressure side venting of
heater drain system,• Replacement of two low pressure turbine rotors, stators
and bearings with better thermo-hydraulic efficiency (about 3%),
• Installation of seismic protection equipment on the polar crane in the reactor containment building.
• Chilled Water System Chiller Replacement,• Reactor building recirculation sump strainer
replacement,• Replacement of thermal insulation inside the containment.
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Major future modifications
• Under construction: A new cooling tower
• Announced: Digital Electro-Hydraulic Control System – DEH
• In preparation: Installation of the third emergency Diesel Generator DG3
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Problems
• Disintegration of an AF flow distributer in SG• Increased AF and IB room temperature • Warming of Ultimate Heat Sink - Sava river
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Disintegration of AF flow distributer in SG
Two loose parts found during outage 2007 in the secondary side of steam generator
Disintegrated AFW flow distributor (vanes, 150x70x20mm) ~50 U tubes had marks of mechanical damage, 16 U tubes were
plugged AF flow vanes also exhibited cracks also in another steam
generator Both flow distributors replaced
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Increased AFW Room Temperature
• In summer temperature in turbine drive auxiliary feedwater pump raises above maximum allowed.
• Four times between 2002 and 2005• Special analysis established that equipment can
withstand 46°C.• Maximum allowed temperature increased from
40 to 46°C • Issue will be addressed through Aging Program
and Maintenance Procedures
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Sava River high temperature
• River Sava temperature is warmer every summer!• Approaching ultimate heat sink limit temperature!• Actions:
– improved Service Water System pumps characteristics in 2002 and 2004
– temporary Justification for Continuous Operation up to 27,4oC
– modification of Chilled Water System underway (air cooled)
• Remains an open issue
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Resolution of sump clogging issue
Slovenia closely followed US NRC GL 2004-02 requirements
Isolation at lower levels and critical points replaced with metal reflecting isolation
Sump screen/strainer replaced – new one with 300+m2 area, 1.6 mm diameter mesh
Procedure for control of materials in containment in place
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Tritium issue
• Tritium releases problem after introduction of 18-month fuel cycle.
• In 2006 the quarterly release limit of 8 TBq exceeded.
• Tritium contributes to annual effective dose <10 nSv.
• SNSA increased annual limit from 20 to 45 TBq and halved the limit for other liquid discharges
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Issues from outside
• Hydro Plants• Airport
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Issues from outside – Hydro Plants
Chain of HPPs under construction on river Sava up and downstream of NPP SNSA is setting conditions for these constructions
Reassessment of external flooding hazard to the Krško NPP: probabilistic assessment of floods – Q(10.000) values higher
by 12% some deficiencies in flood protection dikes identified probable maximum flood (PMF) analysis according to
ANSI/ANS-2.8-1992 underway - PMF values higher for 35-50% flood analysis for HPPs dam failures according to ANSI/ANS-
2.8-1992 is underway Krško NPP protection against flooding needs to be
upgraded At the same site are planned radwaste repository and a
new NPP
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Krško NPP: Issues from outside – Airport Cerklje
• Airport Cerklje in the vicinity of NPP Krško will be expanded
• In- and out-going air traffic will increase• Air exclusion zone (r=1km, h=5000ft) around NPP
remains in force• Military facilities at the airport will be refurbished
and expanded with civil aviation• A study into possible effects to NPP Krško is
underway • Decrease in nuclear safety will not be allowed
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
The second NPP unit
• Planned since July 2006• Should go on-line 2017• Project has not started yet
• It will most probably be a PWR at the same site• The GEN-energija utility will be the investor
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Siting of new NPP
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
“Simplicity” of the process
Many players:• Government• Ministry of
Environment• Ministry of Economy• SNSA• …
Several Laws:• Spatial Planning• Protection of Nature• Construction• Mining• Nuclear Safety
Licenses, legal procedures
Facilit
y
typ
e
NPP
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA’s role
Siting
Trial operation
Operation
End of operation
Decommissioning
Construction
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Other facilities
• TRIGA research reactor
• Central Interim RW Storage
• Former Uranium Mine
• Looking for the LILW Repository
• >1000 sources of ionizing radiation
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Low and Intermediate Level Repository
• Three repository options studied for a site close to the Krško NPP.
• Site is not perfect – problem of floods
• Underground silos proposed
– ~55 m deep and 30 m diameter built from the surface,
• Public hearing and acceptance process is underway
• Should be finally accepted by the Government.
• Possible expansion for Croatian half of waste
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Legislative Arrangements
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
• Act on nuclear safety from 2002• 22 decrees and regulations• Several older still valid• Intensive involvement in WENRA process• Two regulations will harmonize with WENRA
– On nuclear safety design bases, documentation and licensing
– On operational nuclear safety
• Being discussed, adopted 2008 or 2009.
Legislative and Regulatory Framework
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Regulatory Supervision
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
• SNSA - within the Ministry of the Environment and Spatial Planning
Slovenian Nuclear Safety Administration SNSA
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA within the governmental structure
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA:
• 46 staff positions. – 9 Ph.D.– 14 Master of Science– 20 Graduated Engineers– 3 Technical Staff
• Annual budget about 2,7 mio EUR
• Independent in its professional decisions.
• Licensees may appeal to the Ministry of Environment
• Drafts regulations or decrees
• Issues individual legal acts - decisions to the licensees.
• Independent inspection
SNSA ID
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA: • December 2007: ISO 9001:2000 certified
SNSA Management System
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Integrated Assessment System
NPP
Inspections
Rumors
Licensing ofChanges
SNSA Management Meeting(daily)
Feeling about the Climate in the NPP
Third PartyNews
BAD
Reporting Managementmeetings
Safety Indicators
Outages
OEF Analyses
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA System of Safety Indicators
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Fuel Cycle and Outage Analysis
OU
TA
GE
Inspection of maintenance activities
Inspection of modifications
Inspection of tests
Formation of SNSA review team
Preparation of review plan
Draft of Outage analysis report
NPP's Outage plan
Co-ordination with NPP and TSOs
Daily meetings and drafting of report
Finalization of the report with the Action plan
Revision of the report with the Action plan
Implementation of the Action plan
Transfer of not fully implemented actions into new cycle
Archiving
+15 d
+30 d
During fuel cycle
-30 d
-30 d
-60 d
-6 m
SNSA TSOs
TSO's report
SNSA
SNSA
SNSA
NPP
SNSA
SNSA
Comments of TSOs and NPP
SNSA
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Risk Based Regulatory Oversight
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Risk Based Regulatory Oversight
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Risk Based Regulatory Oversight
Highlights/Themes of 2008 Report
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Risk Based Regulatory Oversight
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
SNSA Communication Strategy
• First communicate it on technical level trying to “sell the idea”
• If not accepted: increase informal pressure – meeting with the management
• Only after that follows our order (decision)!
(Never in last 5 years!)
Regulatory Gun
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Good Practices
• Krško NPP: – Long term (5 yrs) investment plan approved (gives
flexibility for nuclear safety maintenance)
– Dedicated training programme for field operators developed, “motor operated valves” training center
– Corrective Action Programme (CAP)
– Resolution of sump clogging issue
• SNSA – ISO 9001 certified
– comprehensive outage inspection programme,
– Risk Based Oversight
– Plant Performance Indicators
Good practices
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Issues from 2005
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Challenges
• Pressure of owners to reduce operating costs Owners approved kWh price: covers production + investments. Long term stability guaranteed
• SNSA Projects – Managing of ageing processes in the Krško NPP
Internal SNSA system developed and used
– Plant event analysis by the regulatory bodyRegularly performed
– Review of NPP Krško Safety Culture and guidelines for regulatory evaluation of Safety Culture
Partly done: “soft system” established, more formal developed
– Development of PSADone, being used!
Follow-up from 3rd Meeting
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Challenges
• Siting of LILW repository Site in Krško community waits local approval this year
LILW operational by 2013
• Decision on high-level RW No change – decision to be taken after 2020
• Agreement about repository between Slovenia and Croatia
No news, maybe after Slovenia gets a site
Follow-up from 3rd Meeting
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Challenges
• Qualification of domestic subcontractors Qualifications of authorized experts
Postgraduate studies, research support, European cooperation- EURATOM projects,
Strengthening education in the nuclear areas
Targeted research programmes
• Quality Management System Krško NPP Quality Assurance Plan meets criteria of
10CFR50 Appendix B and 50-C/SG-Q and is constantly upgraded
Follow-up from 3rd Meeting
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Challenges
• Notification of Neighbouring Countries in Nuclear Emergency Austria, Hungary, IAEA, ECURIE, Croatia would be
notified in accordance with international agreement
Croatia as immediate neighbor is notified from Slovenian Civil Defense headquarters in parallel with the notification of Slovenian responsible authorities
• Installation of a new emergency diesel generator Krško NPP decided to install a Class 1E 3.5 MW diesel
generator by 30.6.2012.
Follow-up from 3rd Meeting
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Planned Measures to Improve Safety
• Action plan for the PSR Completed and approved in 2005,
No major safety issue was revealed, By the end of 2006 20 of the actions were closed, the whole PSR
Actions Plan shall be completed by the end of 2010.
Main closed activities address the potential seismic design problems
• Revised programme of decommissioning and waste disposal Decommissioning programme approved in March 2005, Decommissioning Fund in Slovenia is being managed properly, Croatia started to collect decommissioning funds on a separate
account within the state budget in 2006, In October 2007 Croatian Decommissioning Fund was
established New revision of Decommissioning programme is due in 2009
Follow-up from 3rd Meeting
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Answers to Questions 2008
Selection
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• PSR prioritization process consisted of pre-screening and ranking process. A significant number of issues survived the pre-screening process. All this safety issues were assessed based on a method as described in Haimes’ Risk Modeling, Assessment and Management.
• The new SPSA has shown that in spite of the increased seismic hazard the calculated core damage frequency has decreased due to some seismic upgrades, inclusion of additional systems in the model and revised selected fragilities.
• Operational events caused by inappropriate use of procedures is decreasing (from 3.7% in 2003 to 1.6% in 2007)
• Ageing problems managed by the programs like preventive and corrective maintenance, in-service inspection, in-service testing, environmental qualification and erosion/corrosion program
Questions Raised
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
• Deterministic reconciliation of the new seismic hazard: As input free field response spectra determined in first PSHA, scaled to 0.6 g (twice the size of the SSE values) was used. The floor response spectra obtained were very similar to the design floor response spectra. In the original design, peak ground acceleration of the SSE was PGA=0.3 g. It was applied without any reduction at the level of foundation. Based on that and the fact that new PSHA seismic inputs are lower than the values used in seismic PSA (0,6 g) there is no need to reconcile this further in a deterministic manner.
• Number of SNSA staff: Slovenian government follows the policy of not increasing the number of civil servants. In parallel the SNSA has substantially improved its management system and increased the efficiency and effectiveness of its work.
Questions Raised
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
• The regulatory and legislative framework is governed only by the Slovenian side, since the Krško NPP is situated on the Slovene territory. The Croatian Nuclear Safety Authority does not participate in establishing regulations.
• SNSA has no human resources department since these issues are handled at the level of the Ministry of Environment
Questions Raised
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
• There are no legal requirements for using PSA methods to support Periodic Safety Review. Nevertheless, PSA was used as a supporting tool during the first PSR at the Krško NPP.
• Slovenia does not participate in any large nuclear safety related experimental test programme. Nevertheless the work of OECD/NEA CSNI WGAMA (Working Group on Analysis & Management of Accidents) is followed closely,
• The living PSA is used as a support tool for decision making in introduction of design improvements and modification, planning of activities during plant outages, planning of on-line maintenance, planning of surveillance testing and modifications of plant programmes and procedures.
Questions Raised
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REPUBLIC OF SLOVENIAMINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNINGSLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Conclusions
• The only NPP operating safely
• Slovenia has proper Legislative System
• Regulatory Supervision is efficient and effective
Slovenia and its Nuclear Facilities fulfills requirements of the
Convention on Nuclear Safety