Presentacin de PowerPoint

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Inspection Qualification
and Plant Life Management for Long
Term Operation   Marchena, M. Ranalli, J.
Versaci, R.   SUBPROGRAMA DE GESTIÓN Y EXTENSIÓN
DE LA VIDA DE CENTRALES NUCLEARES DE
POTENCIA. COMISION NACIONAL DE ENERGÍA
ATOMICA Vienna, 15-16 October 2008
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CONTENTS

• - INTRODUCTION
• LONG TERM OPERATION
• - AGEING MANAGEMENT PROGRAMME
• ATUCHA II AGEING MANAGEMENT PROGRAMME
• -ATUCHA I IN SERVICE INSPECTION
• - CONCLUSIONS

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ARGENTINA NUCLEAR POWER PLANTS
ATUCHA I NUCLEAR POWER PLANT EMBALSE NUCLEAR
POWER PLANT ATUCHA II NUCLEAR POWER PLANT (UNDER
CONSTRUCTION)
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ATUCHA I NUCLEAR POWER PLANT
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ATUCHA I TECHNICAL FEATURES

• Designer Siemens AG
•    Commercial activity since 1974
• Gross Power 370 MWe
• Reactor Pressurized heavy water reactor
  (PHWR)
• 252 vertical fuel channels.
• Fuel natural Uranium (UO2), low enriched
• uranium (0.85 235U) in-service reloading.
• Moderator Coolant D2O

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Embalse Nuclear Power Plant.
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EMBALSE TECHNICAL FEATURES

•   Designer AECL (Atomic Energy of Canada
• Limited)
•    Commercial activity since January 1984
• Gross Power 648 MWe (self consumption 48
• Mwe) Load Factor 88,25.
• Reactor CANDU - 380 Pressurized D2O
• Horizontal Pressure Tubes
•   Fuel natural Uranium (UO2), in-service
  reloading.
• Moderator Coolant D2O

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Atucha II Nuclear Power Plant
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ATUCHA II TECHNICAL FEATURES

• Designer Siemens AG
•    UNDER CONSTRUCION
• Gross Power 740 MWe
• Reactor Pressurized heavy water reactor
  (PHWR)
• Fuel natural Uranium (UO2), in-service
  reloading.
• Moderator Coolant D2O

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Atucha I and Atucha II
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-
ATUCHA II
SAFETY
AVAILABILITY
LONG TERM OPERATION
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Atucha II
Construction has been suspended since 1995 until
2006
About 95 of the items were already either
stored or erected at site
The civil works of building were 99 complete and
about 35 of electromechanical.
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Ageing Management Programme
AGEING MANAGEMENT PROGRAMME FOR ATUCHA II LONG
TERM OPERATION
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Ageing Management Programme

• In Atucha II Nuclear Power Plant, given the
  delays in their construction, carry out an Ageing
  Management Programme of SSCs is of fundamental
  importance. In this programme special emphasis
  should be put in the possible stressors of the
  degradation like consequence of the delays in the
  construction.

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Ageing Management Programme
Ageing Management Programme is a basis documents
for licences operating and for the periodical
renewal.
Ageing Management Programme of the SSCs is the
base to be able to operate the Nuclear Power
Plant for a Long Term, typically 60 years, and is
the fundamental thing for a continuous operation.

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Ageing Management Programme
Selection of critical components for LTO.
Material/degradation mechanisms matrix and
indicators systems of material degradation.
Existing and missing information about critical
components.
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IDENTIFY THE CRITICAL
Considerations Safety

COMPONENTS
Reliability, Cost

Design
Requirements, Safety Analysis
Manufacturing/
REVIEW DESIGN Construction
MANUFACTURING AND
Deviations
CONSTRUCTION DATA


Operating Environment, Unusual Events
REVIEW OPERATING
Inspection and
HISTORY Maintenance

Identify Stressors

AGEING

ASSESSMENT
Determination of









Ageing
Mechanisms

R D

PROGRAMMES
LIFE MANAGEMENT
External

PROGRAMME
Experience



NO ACTION
RECOMMEND RECOMMEND
REQUIRED
MONITORING MITIGATION METHODS

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Ageing Management Programme
Operating organizations should evaluate current
surveillance, monitoring and maintenance
programmes for effectiveness in detecting and
characterizing the ageing mechanisms for each
structure and component. The evaluation should
provide a technical basis to justify that the
ageing phenomena will be adequately detected with
the proposed inspection or monitoring activities.
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Ageing Management Programme
Date base design and filling for critical
components.
Operating organizations should consider
developing a living database that documents the
effectiveness of maintenance in detecting and
characterizing degradation mechanisms.
The database should provide technical references
to support findings and conclusions.
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ATUCHA II PRESSURE VESSEL
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Schematic view of CNA-2 RPV
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PRESSURE VESSEL
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ATUCHA I PRESSURE VESSEL
C1
V3
V1
C2
Structure of CNA-1 RPV
C3
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Schematic view of CNA-1 RPV

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History of the Inspections RPV-Atucha I
C1 C2 C3 V1--- V5
V6 N3 N4
SOUTH WEST (1972) ...............................
. PSI little value................................
.....................
ROCKWELL (1987) 5 5
T 85 85 X

X
FORCE (1994) T 8-16 mm
T (1996)
4-16 mm T
Mitsui- (1999)

X Babcock (2000)

2-4mm
2-4mm (2005)
16mm T NI
NI NI NI NI

T100 Xindication NI no
indication
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Ageing Management Programme is the fundamental
thing for maintain a high level of safety,
optimise the operation, maintenance and service
life of SSCs, maintain an acceptable level of
performance, maximize return on investment over
the service life of the NPP and provide NPP
utilities/owners with the optimum pre-conditions
for Long Term Operation.
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Many thanks for your attention
Many thanks for your attention