Summary of the 5th Technical Advisory Committee (TAC) Meeting
Date:
May 30 – June 2, 2016
Place:
Central Research Institute of Electric Power Industry
Participants:
TAC:
Mr. Stetkar (Chair), Mr. Afzali, Dr. Chokshi, Mr. Miraucourt,
Prof. Takada, Prof. Yamaguchi
NRRC:
Dr. Apostolakis (Head), Experts of Nuclear Risk ResearchCenterIndustry:
Representatives of Federation of Electric Power Companies(FEPC), experts of Shikoku EPCO and Tokyo EPCO for
respective topics
Proceedings
All topics were discussed in full committee.
Some sessions were intended to share information on current activities andinitiatives of risk management in France and Japan among all participants.
May 30 (Mon)
Topic 1: Risk Assessment Research•

NRRC presented the current research status of Fire PRA and HRA(Human Reliability Analysis), the research of thermal hydraulic behavior
in containment vessel, and five research items recommend by the TAC
letter reports issued after the 4th meeting.

•TAC member commented as follows- Regarding fire PRA, NRRC should establish clear criteria to classify
the fire events.
- It would be better for the HRA guideline to be able to cover various
application areas, instead of focusing on a specific application.
Eventually, it will be desirable to upgrade this HRA guideline so as tocover applications such as external event PRA and level 2 PRA.
Additional guidance and examples of deviation scenarios are needed.

（Handouts）
1-1 Current status of fire PRA research
1-2 Study on the evaluation of convection behavior in containment vessel1

- Summary of outcomes of the 2015 fiscal year1-3 NRRC HRA Guide & HRA Upgrade
1-4 R&D items recommended by TAC -current status-May 31 (Tue.)
Topic 2: External Natural Event Research•

NRRC presented the current research status of SSHAC(*) seismic hazard
analysis, tsunami fragility, seismic fragility, tornado, and volcano.
(*SSHAC: Senior Seismic Hazard Analysis Committee)•TAC member commented as follows- Methodology for tsunami fragility should be upgraded with realistic
consideration based on actual plant characteristics.
- Regarding the development of the simulation model of volcano ash
fall, NRRC should try to develop a simple model first that is
consistent with the available data. After that, if some parts of themodel would be found to have significant contributions to risk, themodel can be refined in those specific parts.

（Handouts）
2-1 Current Status of SSHAC Project2-2 Tsunami fragility
2-3 Progress of research on seismic fragility evaluation
2-4 Tornado
2-5 R&D related to Volcano Hazard

June 1 (Wed.)
Topic 3: Current practice of risk management in France
Mr. Miraucourt, a TAC member, presented the current practice of risk
management in France.
Topic 4: Ikata Project Update
Shikoku EPCO reported the progress of PRA development in Ikata unit 3.
（Handout）

23-1 Ikata Unit 3 Project Update
June 2 (Thur.)
Topic 5: Strategic initiative of the Japanese nuclear industry (informationonly)
FEPC presented the current situation of nuclear industry in Japan and theindustry-wide strategic initiative to realize proper applications ofrisk-informed decision making.

Topic 6: Fact findings of current status of PRAs in Kashiwazaki-Kariwa NPP(information only)
Tokyo EPCO presented the current status of PRA development inKashiwazaki-Kariwa NPP, since Kashiwazaki-Kariwa unit 6 and 7 wereselected as the pilot plant to develop “Good PRAs” for Japanese BWRs.
（Handout）
6-1 Current Status of PRA in Kashiwazaki-Kariwa N.P.S
6-2 Kashiwazaki-Kariwa Implementation Details

3