Eustrio Benitz Furieri

1
Regulatory Review of IC Systems Changes Related
to SGs Replacement, Use of Advanced Fuel and
Power Increasing of ANGRA 1 NPP
COMISSÃO NACIONAL DE ENERGIA NUCLEAR (National
Nuclear Energy Commission)
PRESENTATION TO TECHNICAL MEETING POWER
INCREASING IMPROVED IC MAY 29-31, 2007
PRAGUE CZECH REPUBLIC

• Eustério Benitz Furieri
• Electrical and IC Group
• Reactor Coordination
• CNEN - Brazil

2
Presentation Topics

• Angra 1 Operational Experience Main Facts
• Project Schedules
• Licensing of IC and Electrical Systems
• Some Regulatory Issues
• Conclusions

3
Angra 1 Operational Experiences Main Facts

• Thermal power 1882 MWth, 657 MWe, 2 Loops PWR,
  Westinghouse Twin plant Krsko (Slovenia)
• Utility / Engineering Company - ELETRONUCLEAR
• Construction license May 1974
• Core load September 1981
• First Criticality - March 1982
• Connection to the Grid - April 1982
• Commercial operation - January 1985

4
Angra 1 Operational Experiences Main
Facts(continued)

• Upgrading Programs during Provisional
  Authorization (1981) and Authorization for
  Initial Operation (1987)
• Lessons-learned from TMI-2 accident (IC,
  electrical systems, operator support systems,
  emergency procedures, etc)
• Corrections on design changes of Steam Generators
• Installation of titanium tubes in the Condenser
• New Diesel Generators (currently, 2 main DGs and
  2 former DGs for Blackout Rule)

5
Angra 1 Operational Experiences Main
Facts(continued)

• Phase after the Authorization for Permanent
  Operation (APO) in December 1994
• Upgrading programs from the previous
  authorization had continued and new programs were
  developed after the APO issuance, as Improvement
  Programs of the Authorization.
• In 1990 decade, the rate of degradation of SGs
  tubes in Angra 1 and in other plants with similar
  SGs had urged studies for the replacement
  planning, consolidated in 2000 (when the SGs of
  Krsko were replaced).

6
Project Scope and Schedules

• Steam Generators Replacement
• Utility signed in 2004 a contract with AREVA NP
  subcontract with Brazilian Company NUCLEP for
  assembly scope planned delivery in July 2007
• From Oct-2008 to Jan-26-2009 (Plant Outage P16)
• Next Generation Fuel 16NGF (Westinghouse with
  Brazilian, Korean and Slovenian Organizations
  started 2000-2001) transition fuel cycles are
  going on full core in 21th fuel cycle
• Power uprate of 6.3 is estimated for 2012 19th
  fuel cycle
• Westinghouse was contracted for the Safety
  Analyses revision and related issues at new power
  level.

7
Licensing Events and Documentation
Dead-LinesPlant operation planned to January 26,
2009
8
Some Regulatory Issues

• The following issues should have attention
  together with analyses of the IC and electrical
  systems changes for the Project SGs
  replacement/16NGF/Power uprate
• Significant number of plant transients and trips
  caused by IC and electric systems malfunctions
  of BOL, transformers and off-site power supply.
• Plant performance has been lessened by human,
  ageing mechanisms and organizational factors
  which have to be considered in Project analyses.
• Discussions on unreviewed safety questions had
  some contribution to delay the documentation for
  preliminary reviews on acceptance criteria and
  safety analyses impact.

9
Some Regulatory Issues(continued)

• The new or revised documentation should be
  implemented taking into consideration responses
  to current license conditions (for example PSR
  revision, new Tech. Spec. completion, updated
  FSAR according to recent NUREG-800, electrical
  and IC qualification program to routine plant
  programs)
• The quality management system should be improved
  to assure the application of similar requirements
  for software and digital IC systems important to
  safety by all sectors of the Utility (operation,
  engineering, safety analysis)

10
Conclusions

• Major changes and modernization at Angra 1 NPP
  will improve the safety and overall performance
  of the plant. However, specific demands from IC
  and electrical systems need integrated solutions
  with current plant programs.
• The compliance with regulatory requirements of
  the current License involve many IC, HSI and
  support systems issues which require a management
  together with these major changes and
  modernization of the plant for the next five
  years.
• The improvement of quality management system in
  progress is an important regulatory issue,
  specially in the case of requirements for
  software and digital IC systems important to
  safety, with impact in all upgrading projects and
  in the licensing of new plant with digital IC
  system.

11
ANGRA 1(right) and ANGRA 2 - 2002

12
ANGRA 1, 2 and the Local of Future ANGRA 3
NPPs(picture-1998)