1

TEPCO’s In-house Competitions for Improving Radiation Protection Skills

Junichi TAIRATokyo Electric Power CompanyRadiation Protection Group

ISOE International ALARA SymposiumNovember 13-14, 2008, Tsuruga, JAPAN

2

Profile - Location

3

TEPCO’s Nuclear Power Plants

17 BWRs including 2 ABWRs (total capacity 17,308MWe) - 28% of generation capacity - 41% of generated electricity (FY 2006)

4

ContentsWhat is our In-house Techniques and Skills Competition?Outline of In-house Techniques and Skills CompetitionContent of the CompetitionExamination ItemsScoring method Scenes from the competition  

Results of the CompetitionLooking Back on the Competition

5

What is our In-house Techniques and Skills Competition?

TEPCO has...-power transmission division-power distribution division-power generation divisionIn-house Techniques and Skills Competition -For maintaining and improvement of technical skills

6

Outline of the In-house Techniques and Skills Competition 1/3

The In-house Techniques and Skills Competition - the radiation control department of nuclear power stationAim at -improvement in the skill and motivation required -opportunity to publicize the techniques -new appreciation of the level of present techniques-sharing good practices

7

Outline of the In-house Techniques and Skills Competition 2/3

Date April 10,2008- the Fukushima Daiichi NPSA chamber that simulated the controlled area was installed in a skill training centerScenario- considerding the experience of the Kashiwazaki-Kariwa NPS in the Niigata Chuetsu-oki Earthquake

8

Outline of the In-house Techniques and Skills Competition 3/3

Time 70min

Team(6persons)

3teams・ Fukusimadaiichi.NPS・ Fukusimadaini.NPS・ Kashiwazaki-Kariwa.NPS

Scenario the leakage of water containing radioactive substance

9

Content of the Competition

Start

Generation of a leakage event

(system isolation completed)

Quick response and measurement

Cleanup and monitoring for giving instructions on Radiation Protection

End

Flow of Competition

10

Content of the Competition(layout)

the non-controlled area(simulated)

20000ml (the leakage of radioactive water)

1500ml (the leakage of non-radioactive water)

Service Building 1FL aisle

11

Content of the Competition(layout)

the controlled area

clean up system pump room

laboratory

germanium semiconductor detector

↓50mSv/h

24mSv/h

↓39Bq/cm2

↓18Bq/cm2 ↓12Bq/cm2

↓lower limit of detection (Bq/cm2)

●

●

●

●

High radiation area

12

Content of the Competition(Examination Items)

Needed Technique and Skill(Examination Item)

Examination Criterion

Safety Safety check before operation Was the safety check (the content of the event, protective equipment, planned dosage and division of roles) before the operation carried out appropriately?

Selection and wearing of protective clothes and equipment

Were protective cloth and protective equipment suitable for the on-site situation selected and worn?

Management in special measure area

Was management (time management and the utilization of low dosage areas) in the special measure area able to be carried out?

Prevention of bodily contamination

Were measures to prevent bodily contamination (changing procedure) able to be carried out?

13

Content of the Competition(Examination Items)

Needed Technique and Skill(Examination Item)

Examination Criterion

Quality Setup of partition Was appropriate partition setup (setup to prevent the spread of the contaminated area) carried out before the commencement of field operations?

Use of radiation measuring instruments

Were radiation measuring instruments correctly handled?

Radiation measurement Were various types of radiation measurements (sampling method, selection of measuring instruments, prevention of the spread of contamination) carried out correctly?

Radioactivity assessment Was the assessment of the amount of radioactivity, etc. carried out correctly?

Prevention of the spread of contamination

Were the measures to prevent the spread of contamination able to be carried out?

Report and communication Were the teams able to report and communicate as required?

Planning ofprotective measures

Was the planning of radiation protective measures for subsequent operations appropriate?

14

Content of the Competition(Examination Items)

Needed Technique and Skill(Examination Item)

Examination Criterion

Efficiency Dosage management

Total radiation exposure of each team member

Time spent before assessment

Time spent before the assessment and report of the amount of radioactivity of the leaked water in a non-controlled area

Response time Duration time from the commencement of the competition to the end of response

15

Content of the Competition(Scoring method)

Safety

40POINTS

Efficiency

30POINTS

Quality

30POINTS

100POINTS

16

Content of the Competition

Scenes from the competition

Please look at the DVD....

17

Results of the Competition　 the same scores

for the quality and safety examination items

　‘ the Fukushimadaini.NPS Team’ received a high score for efficiency

18

Looking Back on the Competition - Summary

Publicity about the effort of our radiation control department regarding water leaks

Appreciation of the level of techniques and

skills for radiation control and motivation

Drills repeated in preparation for competition

Task brought up in the review discussion