09 Sandor Ratkai

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09 Sandor Ratkai Powered By Docstoc
					       License Renewal at Paks NPP
          Project Technical Tasks



Sándor RÁTKAI, LR project technical head, PAKS NPP
Telephone: 75/508576, fax: 75/507036
E-mail address: ratkai@npp.hu




                   1st Hungarian-Ukrainian Joint Conference on
       „Safety-Reliability and Risk of Engineering Plants and Components”
                     Miskolc, Bay Z. Institute; 11th April, 2006.
     Why can we speak about LR?

 World tendency
 Feasible in the sense of safety and technical aspects
 Good business
 Decision of the owner
 Society support
 Political support
 Existing regulation
Why to extend the operational lifetime?


Hungarian electricity supply - present situation and
perspectives
– Environmental aspects: Kyoto obligations – it is
  possible only if nuclear is considered
– Security of supply – considering available sources and
  reliable markets to control the import dependence
– Competitiveness of the economy – reliable and cheap
  electric energy is required
    Hungarian electricity production
Today: Well                                  Diversity of the
balanced                                     system ensured
system, the                                  according to
Kyoto targets                                •sources
could be met                          coal   •technologies
                        Nuclear
                         39%
                                     24,8%
                                             •import market
                                             10% system
                                             capacity reserve
                                             exists
                                  oil, gas
                                  34,7%      Total domestic consumption
                                             2004: 41 118 GWh
                water                        Total domestic production
                0,6%                         2004: 33 708 GWh
           Needs for new capacities
  12 000

  11 000

  10 000
                                          new plants
   9 000      import
   8 000      renewables
                                              peak demand
   7 000

   6 000
               hydrocarbon
   5 000

   4 000

   3 000
                       coal
   2 000

   1 000           nuclear
      0
       2005                   2010     2015                 2020

Construction of 6000 MW capacity is needed between 2005 and 2020
  (to replace the old capacities and cover the increasing needs).
                        Domestic market - 2004
12000                                                                                                          20
 GWh
                                                11111.83                            sold GWh                  Ft/kWh
                                                                                    av. price Ft/kWh           18
10000
                                                                                                               16

                                                                                                               14
 8000
                                                                                                               12

 6000                                                                                                          10
                                                       8.5
                                                                                         Largest, cheapest     8
 4000
                                                                                        domestic producer!     6

                                                                                                               4
 2000
                                                                                                               2

      0                                                                                                        0
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Source: www.eh.gov.hu
                                                                                    A
                        Renewable production in 2004: 884 GWh state support: 16.495 MFt 5,95 Ft/kWh
Regulation
Activities for the sake of LR -- LTO
                                Environmental Licensing
1
                                                                                                                  NEW
                         Nuclear Licensing                        4.                                           Issue of the
                                                               Authority                                         license




                                                                                    7. Authority revew
                        (Making of LR application report)
                                                                review
                                                                       5.
                   2.                           3.
2                                      LR „program” making
                                                                 Demonstration
                                                                 of commitment
             Technical tasks

                                                                       6.
                                                              License application
                                                                   document


           1.
    Feasibility study                                        1                      2                     IMPLEMENTATION
                                                                                                         1. Operation due to LAR
                                    Project Plan                                                         2. Reconstruction, upgrad
                                     1. TLAAs                               2010.
     2000.
                                     2. Ageing
                                                                              2011.                       2012.
                                                            2008.
                                     2002.
                                                                    2009.                                        1. unit
REVIEW OF THE PROJECT TASKS
 No.                        Tasks of the project
 1.    Determination of the scope of the license renewal and
       methodology
 2.    Overall review of the current ageing management
       practise
 3.    Solving the currently known unresolved issues
       ( from feasibility study)
 4.    Time Limited Ageing Assessment (TLAA)
 5.    Other TLAA tasks
 6.    Currently known ageing management measures
 7.    Introduction of the new maintenance rules: evaluation,
       methodological task, development of programs
 8.    Finalisation of the programs for equipment qualification
       + methodology development
 9.    Condition maintaining activities (making reconstruction
       plans)
 10.   Elaboration of the measures derived from the
       comprehensive review of the current ageing management
       programs
 11.   Activities to obtain the nuclear safety licence-in-principle
 12.   PR activities
 13.   Implementation of the reconstruction and investment
       plan
 14.   Finalisation of the EQ (deficiencies)
 15.   Fulfilment of the new maintenance rules (effectiveness)
  Integrated Plant
    Assessment
(Review of the AMP)
      SCOPEING + SCREENING of LR
1. Separately managed components:
• Reactor pressure vessel
• Reactor cover
• Reactor inner components
• Pressurizer
• Steam generator
                              Scoping: Safety Class 1-3
• Main circulation pump
• Main gate valve             Screening: Long lived, passive
•………….
2. Review units and commodity groups:

Safety class      Type of component   Working medium    Type of Material

SC 1              Housing of valves     Primary water   Austenic
SC 2              Housing of pumps     (boric acid)     Ferrite
SC 3              Piping                Duna water      ….
4T, which         Vessels               Steam
failure           Heat exchangers       ….
threatens         Acid/alkali
safety            ….
    Integrated Plant Assessment

• Review includes: assessment of the SSCs aged
  status in context with assessment of
  effectiveness of existing AMP
• Review is extended also to plant programmes
  in general, i.e. ISI, T, maintenance practice
 (ASME BPVC sections XI,V)
• Items not included into the scope of LTO are
  covered by PLiM
• Action items: improvement or new programmes
  if needed
• Review the condition of the equipments
Review and assessment of the AMP
• To demonstrate for the extended operational
  lifetime that:
  – The safety and ageing analysis remain valid and could be
    projected to the end of intended operational lifetime;
  – The effects of ageing on the intended function(s) will be
    adequately managed;
  – There is a procedure to deal with unexpected ageing
    mechanisms that can surface later in the years.
• In many cases, the plants existing ageing
  management programmes can be credited as
  acceptable programmes for LTO. For the remaining
  cases, either the plants existing programme can be
  augmented to satisfy the attributes listed above or
  new programmes should be initiated.
TLAA Review
   Time Limited Ageing Analysis
TLAA are defined as those licensee calculations
and analyses (qualifications) that satisfy the
following:
– Involve systems, structures, and components within the
  scope of license renewal;
– Consider the effects of ageing;
– Involve time-limited assumptions defined by the current
  operating term, for example, 30 years;
– Were determined to be relevant in making a safety
  determination;
– Involve conclusions or provide the basis for
  conclusions related to the capability of the system,
  structure, and component to perform its intended
  functions; and
                 PROJECT TASKS-- TLAAs
1. Embrittlement of Reactor Pressure Vessel
   • PTS
    •   p-T curves (normal operation & pressure test)
2. Strength + Fatigue calculations /check of the design/
    • benchmark tasks (tank, piping, flange)*
    •   load catalog
    •   strength calculations fatigue calculations (ASME BPVC 2001.)
    •   thermal stratification
3. Stability of indications (crack growth )
4. Extension of Environmental Qualifications (I&C)
5. Other TLAAs
   • cranes
   • (review of operational limits) ----- preparation of the list
Remark:
* Also for PTS
            OTHER PROJECT TASKS
1. Civil Structures
    • Examination of soil stability (preparation of soil model--sinking);
    • Examination of SC 2 structures due to high temperature ( check
       of >70 °C environments);
    • penetration, examination of machine foundation, liners;
2. Introduction of Maintenance Rule
    • Guidelines for establishment of monitoring of maintenance goals
       (deterministic and risk based) (all of specialty);
    • Benchmark (High pressure safety injunction system);
3. Configuration management programs (Programs for reconstruction
   short, medium, long terms)
4. I & C program modification
5. Making of Final Environmental Usage Report
           PROJECT ORGANIZATION
RELATED ACTIVITIES:            PROJECT                Project     Supervisory
HUMAN PROGRAM,               MANAGEMENT               Board
PUBLIC RELATIONS
                                                   Project administration




                                  LR                        PROJECT TEAM

                             In-house team
                                                       PROJECT PLANNING,
                                 team                  SCHEDULING,
                                                       CO-ORDINATION,
Power Uprating                                         CONTRACTING,
                                                       DOCUMENTATION, QA




                 FSAR upgrading

                                       Scientific committees:
                                     Reactor, Mechanical Eq.,
                                       Civil structures, ISI,
                                        Water chemistry
Thanks for your attention!
                         PTS analyses
1.  HAEA guideline (Analyses of RPV due to PTS events, No.:
    3.17);
2. Scope of PTS transients (10-5/év);
3. Termo hydraulic analyses (transient pressure, temperature);
4. Calculation of neutron fluent at RPV;
5. Calculation of allowable Tk (critical transient temperature)
    value (fracture mechanics);
6. Evaluation RPV embrittlement;
7. Determination of the lifetime of RPV;
8. Determination of technical and administrative measures for
    50 (60) years of RPV lifetime;
9. Summary of PTS results for FSAR;
10. Summary (PR document);

 Deadline: End of 2007
          Scope of the calculations
Scope: Safety Category 1&2 systems

1. Equipments in the main coolant system (Class 1):
  •   Reactor + reactor internals
  •   Pressurizer & MCP & MIV
  •   Steam Generator
  •   Main coolant piping
1. Class 2 systems:
  •   Piping
  •   Heat Exchangers
  •   Pumps
  •   Tanks
  •   Valves
  Main Passive/Active
VVER 440/213 Components
                                         MCP shaft/A
              Steam Generator/P          MCP pump/A
                                        MCP housing/P

                                            MGV shaft./A
                                            MGV motor/A
                                           MGV housing/P

    CR drive/A
CR drive housing/P
                      Primary
                      piping/P


   REACTOR/P                      PRESSURIZER/P
   pressure vessel



                                                   heater patron /P
                                                       Cable/P
      Check of the design against ASME BPVC code
            requirements for selected SSCs

Tasks:

1. Strengths calculations (& embrittlement) (ASME I, III, XI);
2. Review of overpressure protection ;
3. Fatigue calculations (50+10 years, power up rating: 108%,
   thermal stratifications);
4. Determination of fatigue monitoring places and
   parameters;
5. Summary document for FSAR


Deadline: Mid of 2007.
                         Political support
   On 21th November, 2005 the Hungarian Parliament has approved a
   resolution (votes with 339 Yes, 4 No, 8 Abstention):
    1) To initiate activities of preparing for establishment of radioactive
       waste repository for low and medium level of radioactive waste,
    2) Extension of the operational life time of PAKS NPP


The resolution reads as follows:

   “Under Act CXVI of 1996 on Atomic Energy, Article 7, Section (2) the Parliament
   approves, preliminarily and in principle to initiate activities of preparing for the
   establishment of a radioactive waste repository for low and medium level waste in the
   administrative area of Bátaapáti, in the region of Bátaapáti (Üveghuta), in a territory
   which was previously qualified suitable from geological point of view.

   The Parliament takes note of the information on the extension of the
   operational life-time of Paks Nuclear Power Plant, as a solution necessary for
   the long-time and safe provision of the country with electric energy.”

				
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