Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
< All Occasional Topics

ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)
  Vol.5 No.4(Feb-25)
Vol.5 No.3(Nov-25)
Vol.5 No.2(Aug-26)
Vol.5 No.1(May-27)
< Other Issues

Featured Articles
EJAM5-3NT58 "Development of Future Prediction of Animation by coupling of Principle Component Analysis and Singular Spectrum Analysis"
EJAM5-3NT58 Validation of Multifrequency and Window-Multifrequency Techniques using Remote Field Eddy Currents for ISI of FBR Tubes
EJAM5-3NT59 Remote Controlled Robot with expandable features

(in English)

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)
Ageing Management, TEPCO, Fukushima, Maintenance, Replacement, Reacter Internals, Core Shroud, Turbine Rotor, SCC, Corrosion, Mainenance Plan

Full Download( PDF)
  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)