Transcript dogodek”, kje, kdaj - Uprava Republike Slovenije za

4th CNS Review Meeting, Vienna, 15 April 2008
4th Review Meeting of the
Convention on Nuclear Safety
SLOVENIA
Country Group 6
Vienna, NH Hotel, 15 April 2008
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
1
http://www.ursjv.gov.si/
Outline
• Nuclear Safety 2005-2008
• Legislative arrangements
• Regulatory supervision
• Issues from 2005 (Follow-up)
• Questions 2008
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
2
http://www.ursjv.gov.si/
Nuclear Slovenia
Mine
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
TRIGA
NPP Krško
3
http://www.ursjv.gov.si/
Slovenia, the smallest nuclear country
We have everything the big country has …
… but we have to manage it with less
resources!
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
4
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Nuclear Facilities
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
5
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP
•
•
•
•
Westinghouse PWR
2 loop
700 MWe
Commercial operation
since 1983
• Ownership 50:50
Slovenia-Croatia
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
6
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Operation
• Without major problems
• Last reactor trip in 2005
• 18 month fuel cycle
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
7
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Performance Indicators
Load Factor
120
100
[ %]
80
60
40
20
.
av g
200
7
200
5
200
6
200
3
200
4
200
1
200
2
199
9
200
0
199
7
199
8
199
5
199
6
199
3
199
4
199
1
199
2
198
9
199
0
198
7
198
8
198
5
198
6
198
3
198
4
0
year
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
8
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Performance Indicators
Electrical Energy Production
6
5
[TWh]
4
3
2
1
.
av g
200
7
200
5
200
6
200
3
200
4
200
1
200
2
199
9
200
0
199
7
199
8
199
5
199
6
199
3
199
4
199
1
199
2
198
9
199
0
198
7
198
8
198
5
198
6
198
3
198
4
0
year
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
9
http://www.ursjv.gov.si/
Krško NPP: Performance Indicators
Number of Reactor Trips
number of shutdowns
16
14
12
10
8
6
4
2
Manual
.
av g
200
7
200
5
200
6
200
3
200
4
200
1
200
2
year
Auto
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
199
9
200
0
199
7
199
8
199
5
199
6
199
3
199
4
199
1
199
2
198
9
199
0
198
7
198
8
198
5
198
6
198
3
198
4
0
10
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Performance Indicators
Collective Dose
3000
[man mSv]
2500
2000
1500
1000
500
av
g.
19
91
19
92
19
93
19
94
19
95
19
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
0
year
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
11
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Performance Indicators
Unavailability of Auxiliary Feedwater
0,009
unavailability
0,008
0,007
0,006
0,005
0,004
0,003
0,002
0,001
.
av
g
20
07
20
06
20
05
20
04
20
03
20
02
20
01
20
00
19
99
19
98
19
97
19
96
19
95
19
94
19
93
19
92
19
91
0,000
year
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
12
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
13
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
14
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
15
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Human Resources
• Krško NPP staffing
–
–
–
–
Approaching the period of retirements
Active employment policy
Currently 570 staff members
No plans for bigger reductions
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
16
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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)
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
17
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
18
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
19
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
20
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
21
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
22
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Problems
• Disintegration of an AF flow distributer in SG
• Increased AF and IB room temperature
• Warming of Ultimate Heat Sink - Sava river
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
23
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
24
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
27
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
28
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
29
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
30
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Krško NPP: Issues from outside
• Hydro Plants
• Airport
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
31
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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/ANS2.8-1992 underway - PMF values higher for 35-50%
 flood analysis for HPPs dam failures according to ANSI/ANS-2.81992 is underway
 Krško NPP protection against flooding needs to be upgraded
 At the same site are planned radwaste repository and a new
NPP
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
32
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
33
http://www.ursjv.gov.si/
The second NPP unit
Highlights/Themes of 2008 Report
• 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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
34
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
Siting of new NPP
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
35
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
“Simplicity” of the process
Facility
type
Licenses, legal procedures
NPP
Many players:
• Government
• Ministry of Environment
• Ministry of Economy
• SNSA
• …
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
Several Laws:
• Spatial Planning
• Protection of Nature
• Construction
• Mining
• Nuclear Safety
36
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
SNSA’s role
Siting
Construction
Trial operation
Operation
End of operation
Decommissioning
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
37
http://www.ursjv.gov.si/
Other facilities
• TRIGA research reactor
• Central Interim RW Storage
• Former Uranium Mine
• Looking for the LILW Repository
• >1000 sources of ionizing radiation
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
38
http://www.ursjv.gov.si/
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
39
http://www.ursjv.gov.si/
Legislative Arrangements
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
40
http://www.ursjv.gov.si/
Legislative and Regulatory Framework
•
•
•
•
•
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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
41
http://www.ursjv.gov.si/
Regulatory Supervision
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
42
http://www.ursjv.gov.si/
Slovenian Nuclear Safety Administration SNSA
• SNSA - within the Ministry of the Environment and
Spatial Planning
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
43
http://www.ursjv.gov.si/
SNSA within the governmental structure
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
44
http://www.ursjv.gov.si/
SNSA ID
SNSA:
• Licensees may appeal to the
Ministry of Environment
• 46 staff positions.
–
–
–
–
9 Ph.D.
14 Master of Science
20 Graduated Engineers
3 Technical Staff
• Drafts regulations or decrees
• Issues individual legal acts decisions to the licensees.
• Independent inspection
• Annual budget about 2,7 mio
EUR
• Independent in its professional
decisions.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
45
http://www.ursjv.gov.si/
SNSA Management System
SNSA:
• December 2007: ISO 9001:2000 certified
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
46
http://www.ursjv.gov.si/
SNSA Integrated Assessment System
BAD
Feeling about the
Climate in the NPP
SNSA Management Meeting
(daily)
Third Party
News
Inspections
Licensing of
Changes
OEF Analyses
Reporting
Management
meetings
Rumors
Safety Indicators
NPP
Outages
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
47
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
SNSA System of Safety Indicators
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
48
http://www.ursjv.gov.si/
SNSA Fuel Cycle and Outage Analysis
-6 m
NPP
Formation of SNSA review team
-60 d
SNSA
SNSA
Preparation of review plan
NPP's Outage plan
-30 d
-30 d
Draft of Outage analysis report
SNSA
Co-ordination with NPP and TSOs
OUTAGE
Inspection of maintenance activities
Inspection of modifications
SNSA
TSOs
Inspection of tests
Daily meetings and drafting of report
+15 d
TSO's report
Finalization of the report with the Action plan
SNSA
Revision of the report with the Action plan
SNSA
Transfer of not fully implemented
actions into new cycle
+30 d
Comments of
TSOs and NPP
During
fuel cycle
SNSA
Implementation of the Action plan
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
49
Archiving
http://www.ursjv.gov.si/
SNSA Risk Based Regulatory Oversight
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
50
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
SNSA Risk Based Regulatory Oversight
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
51
http://www.ursjv.gov.si/
Highlights/Themes of 2008 Report
SNSA Risk Based Regulatory Oversight
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
52
http://www.ursjv.gov.si/
SNSA Risk Based Regulatory Oversight
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
53
http://www.ursjv.gov.si/
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)!
Regulatory Gun
(Never in last 5 years!)
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
54
http://www.ursjv.gov.si/
Good practices
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
55
http://www.ursjv.gov.si/
Issues from 2005
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
56
http://www.ursjv.gov.si/
Follow-up from 3rd Meeting
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 body
 Regularly 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 PSA
 Done, being used!
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
57
http://www.ursjv.gov.si/
Follow-up from 3rd Meeting
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
58
http://www.ursjv.gov.si/
Follow-up from 3rd Meeting
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
59
http://www.ursjv.gov.si/
Follow-up from 3rd Meeting
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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
60
http://www.ursjv.gov.si/
Follow-up from 3rd Meeting
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
61
http://www.ursjv.gov.si/
Answers to Questions 2008
Selection
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
62
http://www.ursjv.gov.si/
Questions Raised
• 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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
63
http://www.ursjv.gov.si/
Questions Raised
• 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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
64
http://www.ursjv.gov.si/
Questions Raised
• 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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
65
http://www.ursjv.gov.si/
Questions Raised
• 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.
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
66
http://www.ursjv.gov.si/
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
REPUBLIC OF SLOVENIA
MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING
SLOVENIAN NUCLEAR SAFETY ADMINISTRATION
67
http://www.ursjv.gov.si/