1 TEPCO’s In-house Competitions for Improving Radiation Protection Skills Junichi TAIRA Tokyo Electric Power Company Radiation Protection Group ISOE International ALARA Symposium November 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 Contents What is our In-house Techniques and Skills Competition? Outline of In-house Techniques and Skills Competition Content of the Competition Examination Items Scoring method Scenes from the competition Results of the Competition Looking Back on the Competition

5 What is our In-house Techniques and Skills Competition? TEPCO has... -power transmission division -power distribution division -power generation division In-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 station Aim 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, the Fukushima Daiichi NPS A chamber that simulated the controlled area was installed in a skill training center Scenario - 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 Time70min Team (6persons) 3teams ・ Fukusimadaiichi.NPS ・ Fukusimadaini.NPS ・ Kashiwazaki-Kariwa.NPS Scenariothe 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/cm 2 ↓ 18Bq/cm 2 ↓ 12Bq/cm 2 ↓ lower limit of detection (Bq/cm 2 ) ● ● ● ● High radiation area

12 Content of the Competition (Examination Items) Needed Technique and Skill (Examination Item) Examination Criterion SafetySafety check before operationWas 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 QualitySetup of partitionWas 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 measurementWere various types of radiation measurements (sampling method, selection of measuring instruments, prevention of the spread of contamination) carried out correctly? Radioactivity assessmentWas 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 communicationWere the teams able to report and communicate as required? Planning of protective 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 EfficiencyDosage 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 timeDuration time from the commencement of the competition to the end of response

15 Content of the Competition (Scoring method) Safety 40 POINTS Efficiency 30 POINTS Quality 30 POINTS 100 POINTS

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