TEPCO s In-house Competitions for Improving Radiation Protection Skills

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 1

Profile - Location 2

TEPCO’s Nuclear Power Plants 17 BWRs including 2 ABWRs (total capacity 17, 308 MWe) - 28% of generation capacity - 41% of generated electricity (FY 2006) 3

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 4

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 5

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 6

Outline of the In-house Techniques and Skills Competition 2/3 Date April 10, 2008 - 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 7

Outline of the In-house Techniques and Skills Competition 3/3 Time 70 min Team (6 persons) 3 teams ・Fukusimadaiichi. NPS ・Fukusimadaini. NPS ・Kashiwazaki-Kariwa. NPS the leakage of water containing radioactive substance Scenario 8

Content of the Competition Flow of Competition Start Generation of a leakage event (system isolation completed) Quick response and measurement Cleanup and monitoring for giving instructions on Radiation Protection End 9

Content of the Competition(layout) the non-controlled area(simulated) Service Building 1 FL aisle 20000 ml (the leakage of radioactive water) 1500 ml (the leakage of non-radioactive water) 10

Content of the Competition(layout) the controlled area clean up system pump room High radiation area ↓ 39 Bq/cm 2 ↓ 50 m. Sv/h ● 24 m. Sv/h ↓ 18 Bq/cm 2 ● ↓lower limit of detection ● ↓ 12 Bq/cm 2 laboratory ● (Bq/cm 2) germanium semiconductor detector 11

Content of the Competition (Examination Items) Needed Technique and Skill (Examination Item) Examination Criterion 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? 12

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 of protective measures Was the planning of radiation protective measures for subsequent operations appropriate? 13

Content of the Competition (Examination Items) Needed Technique and Skill Examination Criterion (Examination Item) 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 14

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

Content of the Competition Scenes from the competition Please look at the DVD. . 16

Results of the Competition 　the same scores for the quality and safety examination items 　‘the Fukushimadaini. NPS Team’ received a high score for efficiency 17

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 18