11

Approaches of Knowledge Management System

for the Decommissioning of Nuclear Facilities

Masashi TEZUKA2

Satoshi YANAGIHARA1

Yukihiro IGUCHI1,2

Yuya KODA2

Yasuaki KATO1,2

1. Research Institute of Nuclear Engineering University of Fukui

2. Fugen Decommissioning Engineering Center, Japan Atomic Energy Agency

IAEA Third International Conference on Nuclear Knowledge

Management: Challenges and Approaches, Vienna, Austria,

7 – 11 November 2016

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Tokai, JAPC (GCR)- Graphite-moderated CO2-cooled

- 166 MWe (Jul.1966 – Mar.1998)

- Decommissioning: Dec.2001 –

2025JFY

JPDR, former JAERI(experimental BWR)

- 12.5 MWe (Oct.1963-Mar.1976)

- Decommissioning :

May 1986 – Mar.1996

http://www.japc.co.jp/project/haishi/index.html

Hamaoka 1,2, Chubu (BWRs)1: 540 MWe (Mar.1976 - Jan.2009)

2: 840 MWe (Nov.1978 - Jan.2009)

- Decommissioning: Nov. 2009 - 2036JFY

Current Status of Decommissioning NPPs in Japan

http://www.jaea.go.jp/04/ntokai/decommissioning/01/decommissioning_01_01.html

Mihama 1,2, KEPCO

(PWRs)1 : 340 MWe (Nov.1970 -

Apr.2015)

2 : 500 MWe(Jul.1972 - Apr.2015)

Tsuruga 1, JAPC

(BWR)- 357 MWe (Mar.1970 -

Apr.2015)

Shimane 1,

Chugoku (BWR)- 460 MWe

(Mar.1974-Apr.2015)

Genkai 1,

Kyushu (PWR)- 559 MWe

(Jul. 1975 - Apr.2015)

6 units shut down for decommissioning

Fugen, JAEA (ATR)- Heavy water moderated, light water

cooled

- 165 MWe (Mar.1979 - Mar.2003)

- Decommissioning: Feb.2008 - 2033JFY

4 units are under decommissioning

http://www.kepco.co.jp/corporate/info/community/mihama/about.html

http://www.energia.co.jp/shimane-h/

http://www.kyuden.co.jp/nuclear_index.html

http://www.japc.co.jp/plant/index.html

Fukushima-Daiichi 1-6,

(Specified nuclear facilities)

TEPCO (BWRs)1: 460MWe (Mar.1971 - Mar.2011)

2: 784MWe (Jul.1974 - Mar.2011)

3: 784MWe (Mar.1976 - Mar.2011)

4: 784MWe (Oct.1978 - Mar.2011)

5: 784MWe (Apr.1978 - Jan.2014)

6: 1100MWe (Oct.1979 - Jan.2014)

Operational

Ikata 1,

Shikoku (PWR)- 566 MWe

(Sep.1977- May 2016)http://www.yonden.co.jp/energy/atom/ikata/page_02.html

http://www.chuden.co.jp/energy/hamaoka/hama_about/location/ http://www.jaea.go.jp/04/fugen/index.html

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Background

• The decommissioning of a nuclear facility is a long term

project.

• The decommissioning project is likely to be delayed.

• The transfer of knowledge and education to the next

generation is a crucial issue.

• In Japan, based on the past experience, the increasing

decommissioning projects are going on.

• Organized methods or a system for knowledge

management is necessary in order to solve it.

• Knowledge Management (KM) (for decommissioning)

should be well planned through all the life stages of

nuclear facilities.

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• Required knowledge is different from that of construction

or operation phase

• The knowledge of the design is used in different manner

in the dismantling stage.

• Decommissioning is one-time project. it may not be cost

effective to collect and organize the knowledge.

• If the knowledge is valuable or general, it can be

reusable inside the project or a similar project.

• It is possible to transfer knowledge by moving staff, but it

is not always rational.

• For the normal decommissioning project, it is possible to

implement with combination of existing technologies. In

this case, the important knowledge is “Which technology

is suitable?” for low risk, low cost and short time project.

Characteristics of knowledge for decommissioning

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Systemized

Knowledge of Decommissioning

Data of Design, Construction,

O&M of a Specific Plant

Systemized Explicit Knowledge for Decommissioning of a Specific plant

Knowledge Still Tacit

Systemized

InformationSystemized

Information for

Decommissioning

Transfer by Practicing

R&D Results of Domestic &

International

Decom. Facilities

Sharing and Utilization of Knowledge

(Practicing, Education, Transfer)

Personal Knowledge(Explicit or Tacit)

Engineers with Experience of

Design, Construction, O&M

① Establishment of

Knowledge Acquisition

③ Construction of KM Support System

② Formulation of

Knowledge Acquisition

Outline of the Knowledge Management Approaches

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STEP1: Establishment of knowledge acquisition method

necessary for decommissioning

Extraction and Arrangement of data and information from

international or domestic decommissioning results of research

Organization and Systematization of information by establishing rules

and methods to extract necessary information from plant specific data

Establishment of method of knowledge extraction based on the

decommissioning taxonomy

STEP2: Formulation of knowledge acquisition from experienced

engineers

Externalization of implicit knowledge of employees along with their

occupational history

Establishment of method for extraction of knowledge and know-how

from communication with experienced employees such as

questionnaires interviews or event simulations for socialization and

externalization

Examples of Activities for the KMS

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STEP 3: Construction of KM support system for

decommissioning

Enhancement of information access system by knowledge

engineering technologies

Application of advanced information technology such as 3D-

CAD, VR or AR

Enhancement of knowledge internalization of present employees

by discussion meetings

Establishment of knowledge transfer by special lectures or

training by retiring employees

Knowledge transfer support from retirees by continuous

communication even after retirement

Information exchange framework with other decommissioning

facilities

Making documents of standardization of decommissioning

knowledge

Examples of Activities for the KMS

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Knowledge Management Support System(Information Exchange and QMS based IT systems)

Enhancement of

communication between

employees

• Personal profile and

expertise data

• Enhancement of daily

communication

• Knowledge search such as

Q&A system

Extraction of useful

knowledge

• Knowledge acquisition

during the daily work

• Knowledge acquisition

process based on the

Quality Management System

Existing

QMS

Knowledge acquisition

process (SECI Model)

Information exchange by

person to person levelEnhancement of information

sharing and knowledge

acquisition

SocializationSharing & creating

tacit knowledge

through direct

experience

ExternalizationArticulating tacit

knowledge

through dialogue

and reflection

InternalizationLearning &

acquiring new tacit

knowledge in

practice

CombinationSystemizing &

applying explicit

knowledge &

information

Tacit Tacit

Exp

licit E

xplic

it

Explicit Explicit

Tacit T

acit

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Knowledge Management Support System(Knowledge Transfer and Education etc.)

Transfer of knowledge from

retirees to existing employees

• Questionnaire or interview to

elderly employees

• Education in the office or field

• Study meeting or face to face

education

Support system by advanced

technology Virtual Reality or

Augmented Reality based on 3D-CAD

• Embedding of necessary data,

information and knowledge in the

virtual model

• Provision of significant knowledge of

decommissioning planning and

implementation when necessary

Material: SUS316,High contamination,

Dismantling experience in XXX

NPS

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Conclusions

• Enhancement of Communication

- You can know whom you should ask something to know

by sharing personal field each other.

• Extraction of Useful Knowledge

- Activities based on running Quality Management System

are useful

• Transfer of Knowledge to Next Generation

- We have to effectively get explicit and tacit knowledge of

retiring employee

• Support system by VR or AR based on 3D-CAD

- Advanced IT tools are useful, but you should be careful

not to spend too much cost.

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Thank you for your attention!