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Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
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OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
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Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

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OT1 - OT2 - OT3 - OT4 - OT5 - OT6 - OT7 - OT8 - OT9 - OT10.. All OTs
Occasional Topics
OT4 (09-09-16)
 
Ageing Management of Nuclear Power Plants in TEPCO
 
Hiroshi ABE and Toshiaki NISHIYAMA (Tokyo Electric Power Company)
 
KEYWORDS：
Ageing Management, TEPCO, Fukushima, Maintenance, Replacement, Reacter Internals, Core Shroud, Turbine Rotor, SCC, Corrosion, Mainenance Plan
 

Full Download( PDF)
slide
  1. Ageing Management of Nuclear Power Plants in TEPCO
Hiroshi ABE and Toshiaki NISHIYAMA
August 2009
Tokyo Electric Power Company
  2. Number of Aged Nuclear Power Plants in Japan
  3. TEPCO’s Nuclear Power Plants
  4. Fukushima Dai-ichi Nuclear Power Plant (1F NPP)
  5. Maintenance Activities
  6. Replacement of RPV Internals

・Fukushima-Daiichi Unit 3 (1998), Unit 2 (1999), Unit 5, (2000), Unit 1 (2001)
・The shrouds and other internals such as FW sparger replaced with SUS316L

  7. Replacement of Turbine Rotor

・Fukushima-Daiichi Unit 1: 1989, etc.
・Crack indications in the discs (due to SCC)

  8. Evaluation Components in Ageing Management Study
  9. Procedure of Ageing Management Study
10. Procedure of Ageing Management Study(2)
11. Procedure of Ageing Management Study(3)
12. Results of Evaluation

Most components
　Long-term and safe operation is possible if the current maintenance is continued
Some components
　Some additional maintenance for AM is required
　　 　=> Establish the 10-year maintenance plan

13. Example of Added Maintenance Task (Fukushima-Daiichi Unit3)

Ageing Management on PCV (Primary Containment Vessel)
　=> Evaluation :
　　　Possibility of corrosion at carbon steel shell of PCV
　=> Current maintenance tasks:
　　　Leak rate test, VT on painted surface
　=> Added maintenance tasks:
　　　Measurement of wall thickness

14. Example of Added Maintenance Task (Fukushima-Daiichi Unit3)(2)
15. Summary and Up-coming Issue

TEPCO introduced “Ageing Management in our NPPs” this time.
We will report “New Maintenance Strategy and Effective Ageing Management” at the next Occasional Topics in EJAM
EJAM OT4: "Ageing Management of Nuclear Power Plants in TEPCO " by Hiroshi ABE and Toshiaki NISHIYAMA (Tokyo Electric Power Company)