License Renewal at Paks NPPLicense Renewal at Paks NPP Project Technical TasksProject Technical Tasks

Sándor RÁTKAI, LR project technical head, PAKS NPPTelephone: 75/508576, fax: 75/507036E-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?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?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 productionHungarian electricity production

Nuclear

39%

coal

24,8%

oil, gas

34,7%

water

0,6%

Today: Well balanced system, the Kyoto targets could be met

Diversity of the system ensured according to•sources•technologies•import market10% system capacity reserve exists

Total domestic consumption 2004: 41 118 GWh

Total domestic production 2004: 33 708 GWh

Needs for newNeeds for new capacitiescapacities

nuclear

coal

hydrocarbon

renewablesimport

new plants

0

1 000

2 000

3 000

4 000

5 000

6 000

7 000

8 000

9 000

10 000

11 000

12 000

2005 2010 2015 2020

peak demandpeak demand

Construction of 6000 MW capacity is needed between 2005 and 2020

(to replace the old capacities and cover the increasing needs).

Domestic marketDomestic market - - 2004 2004

11111.83

8.5

0

2000

4000

6000

8000

10000

12000

Budap

esti

Pannon

AES-Tis

za

Csepel

i

Dunam

enti

Impo

rt

Paksi

AE

Mát

rai

EMA-P

ower

Debre

ceni

Ajkai

AES-T-p

alko

nya

AES-Bors

odi

Orosz

lány

i Termelő

GWh

0

2

4

6

8

10

12

14

16

18

20Ft/kWhsold GWh

av. price Ft/kWh

Largest, Largest, cheapest cheapest domestic domestic producer!producer!

Source: www.eh.gov.hu

Renewable production in 2004: 884 GWh state support: 16.495 MFt 5,95 Ft/kWh

RegulationRegulation

Activities for the sake of LRActivities for the sake of LR -- LTO -- LTO

Environmental Licensing

1.

Feasibility study

2.

Technical tasks

3.LR „program” making

4. Authority

review

5.

Demonstration of commitment

2008. 2011. 2012.

IMPLEMENTATION

1. Operation due to LAR

2. Reconstruction, upgrading

2000.

Nuclear Licensing(Making of LR application report)

6.License application

document

7. Au

tho

rity revew

NEW Issue of the

license

Project Plan

1. TLAAs 2. Ageing

Project Plan

1. TLAAs 2. Ageing

2010.

2009. 1. unit2002.

1 2

1

2

REVIEW OF THE PROJECT TASKSREVIEW OF THE PROJECT TASKSNo. 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 Integrated Plant AssessmentAssessment

(Review of the AMP)(Review of the AMP)

SCOPEING + SCREENING SCOPEING + SCREENING of LRof LR1. Separately managed components:• Reactor pressure vessel• Reactor cover• Reactor inner components • Pressurizer• Steam generator• Main circulation pump• Main gate valve•………….2. Review units and commodity groups:

Safety class Type of component Working medium Type of Material

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

Screening: Long lived, passive

Scoping: Safety Class 1-3

• 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

Integrated Plant AssessmentIntegrated Plant Assessment

Review and assessment of the AMPReview 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 ReviewTLAA Review

Time Limited Ageing AnalysisTime 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

– Are contained or incorporated by reference in the current licensing basis (in the FSAR).

PROJECT TASKS--PROJECT TASKS-- TLAAsTLAAs1. 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 TASKSOTHER PROJECT TASKS1. 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 ORGANIZATIONPROJECT ORGANIZATIONPROJECT

MANAGEMENT

Project administration

Power Uprating

LR In-house team

team

PROJECT TEAM

PROJECT PLANNING, SCHEDULING, CO-ORDINATION,CONTRACTING,DOCUMENTATION, QA

RELATED ACTIVITIES:HUMAN PROGRAM, PUBLIC RELATIONS

Project Supervisory Board

FSAR upgrading

Scientific committees:

Reactor, Mechanical Eq., Civil structures, ISI,

Water chemistry

Thanks for your attention!Thanks for your attention!

PTS analysesPTS 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 calculationsScope 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/ActiveMain Passive/Active VVER 440/213 ComponentsVVER 440/213 Components

REACTOR/Ppressure vessel

CR drive/ACR drive housing/P

Steam Generator/P

MCP shaft/AMCP pump/A

MCP housing/P

MGV shaft./AMGV motor/A

MGV housing/P

PRESSURIZER/P

Primary piping/P

heater patron /PCable/P

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.

Check of the design against ASME BPVC code Check of the design against ASME BPVC code requirements for selected SSCsrequirements for selected SSCs

Political supportPolitical 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.”