Radiological Monitoring and Consequences of Fukushima Nuclear Accident (2 June 2011)

Jun 2, 20114 likes5,060 views

This document summarizes radiological monitoring and consequences from the Fukushima Nuclear Accident as of June 2, 2011. Key findings include: - Gamma dose rates were highest in Fukushima prefecture at 1.5 microSievert/hour and decreasing levels in surrounding prefectures. - Low levels of radioactive iodine-131 and cesium-137 were detected in a few prefectures over a few days. - Over 800 food samples from 18 prefectures were tested, with less than 7% exceeding Japanese regulation values for radioactive cesium and/or iodine. Restrictions remained on some foods from Fukushima and Ibaraki.

Fukushima Nuclear Accident Radiological Monitoring and Consequences 2 June 2011

Gamma Dose Rate in 47 Prefectures on 31 May Fukushima prefecture: 1.5 µSv/h

Gamma Dose Rates in 7 Prefectures 24 March – 31 May Natural background: 0.1 microSievert/hour

Gamma dose rate in the East of Fukushima prefecture

Concentration in air of I‐131 and Cs‐137 detected at Fukushima Daiichi West Gate (at a distance of 1 Km to NPPs)

Deposition of I‐131 and Cs‐137 in 47 prefectures • I‐131 – Not detected since 18 May • Cs‐137 – Detected in a few prefectures over a few days – Low levels ranging from 2.2 to 91 Bq/m2

Protective actions • Drinking water: All restriction lifted • The Government of Japan has announced evacuation measures: – Beyond distances of 30 km from Fukushima Nuclear Power Plants – NISA: evacuation of the “Planned Evacuation Zones” within Iitate village and Kawamata town commenced on 15 May.

Food Monitoring and Food Restrictions (Reported 19 – 31 May) • 818 samples from 18 prefectures • Over 40% of monitoring is in Fukushima prefecture • Over 93% of samples indicated Cs‐134 /Cs‐137 or I‐131 were not detected or were below the Japanese regulation values • Less than 7% were above the Japanese regulation values for Cs‐134 /Cs‐137 and/or I‐131 • Restrictions on the distribution and/or consumption of specific foods in certain areas of Fukushima and Ibaraki prefectures remain in place

350 Total number of food samples tested between 19 and 31 May 2011 300 300 250 Number of samples Neg 200 Cs-total Cs-total & I-131 150 116 100 77 55 50 39 36 33 32 28 22 18 11 9 9 9 6 4 4 2 2 2 2 1 1 0 Prefecture

20 Food samples above the regulation values between 19 and 31 May 2011 18 16 Cs-total 14 Cs-total & I-131 Number of samples 12 12 10 10 8 7 6 4 4 3 3 2 2 2 2 2 2 1 1 1 0 Prefecture / Date of sampling

20 Food samples above the regulation values between 19 and 31 May 2011 18 16 Cs-total 16 Cs-total & I-131 14 Number of samples 12 10 10 9 8 6 6 5 4 2 2 1 1 1 1 0 Chiba / tea Fukushima / Fukushima / Fukushima / Fukushima / Fukushima / Fukushima / Gunma / tea Ibaraki / tea Tochigi / tea Algae Fishery Fruit Mushroom tea Tree / products perennial plant shoots Prefecture / food type

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The document reports on the status of 6 nuclear power plant units in the aftermath of an earthquake (EQ). Units 1-4 were in service or undergoing outage at the time. They suffered varying levels of damage to components and structures. All units had lost off-site power but have since had mobile generators connected. Fresh water injection is being provided to reactor pressure vessels and spent fuel pools via portable pumps with off-site power. Core cooling is maintained where possible but fuel damage occurred in some reactors.

Table summary of reactor unit status at 15-april-1200 utcInternational Atomic Energy Agency

The document reports on the status of 6 nuclear power plant units in the aftermath of an earthquake. Unit 1 experienced damaged core and fuel integrity with a high but stable reactor pressure vessel temperature. Fresh water was being injected into the reactor pressure vessel and spent fuel pool via mobile pumps. Unit 2 had severe core damage and an increasing reactor pressure vessel temperature but fresh water injection was restoring cooling. Units 3 and 4 had damaged cores but stable reactor conditions and were receiving fresh water injection to cooling systems. Units 5 and 6 were in cold shutdown during maintenance and remained stable using off-site power.

Tc programme presentation UN audienceInternational Atomic Energy Agency

The IAEA's Technical Cooperation Programme aims to maximize the contribution of nuclear technology to the world while verifying its peaceful use. It has six departments and works through partnerships with UN organizations in areas like human health, food and agriculture, water and the environment, and nuclear energy and safety. The programme operates in over 125 countries and focuses on achieving the Millennium Development Goals by 2015 through projects like improving disease treatment, increasing crop and livestock production, and supporting sustainable water and environmental resources.

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Table 4: Unit 4 Reactor: Fukushima Daiichi Nuclear Power Plant - 18 May 2011International Atomic Energy Agency

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Table 1: Unit 1 Reactor: Fukushima Daiichi Nuclear Power Plant - 11 May 2011 International Atomic Energy Agency

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Tc Programme - Delivering Results for Peace and Development (Russian)International Atomic Energy Agency

Table summary of reactor unit status at 18-april 2011International Atomic Energy Agency

Table summary of reactor unit status at 15-april-1200 utcInternational Atomic Energy Agency

Tc programme presentation UN audienceInternational Atomic Energy Agency

TC Programme Presentation RussianInternational Atomic Energy Agency

Radiological Monitoring and Consequences of Fukushima Nuclear Accident (2 June 2011)

1. Fukushima Nuclear Accident Radiological Monitoring and Consequences 2 June 2011

2. Gamma Dose Rate in 47 Prefectures on 31 May Fukushima prefecture: 1.5 µSv/h

3. Gamma Dose Rates in 7 Prefectures 24 March – 31 May Natural background: 0.1 microSievert/hour

4. Gamma dose rate in the East of Fukushima prefecture

5. Concentration in air of I‐131 and Cs‐137 detected at Fukushima Daiichi West Gate (at a distance of 1 Km to NPPs)

6. Deposition of I‐131 and Cs‐137 in 47 prefectures • I‐131 – Not detected since 18 May • Cs‐137 – Detected in a few prefectures over a few days – Low levels ranging from 2.2 to 91 Bq/m2

7. Protective actions • Drinking water: All restriction lifted • The Government of Japan has announced evacuation measures: – Beyond distances of 30 km from Fukushima Nuclear Power Plants – NISA: evacuation of the “Planned Evacuation Zones” within Iitate village and Kawamata town commenced on 15 May.

8. Food Monitoring and Food Restrictions (Reported 19 – 31 May) • 818 samples from 18 prefectures • Over 40% of monitoring is in Fukushima prefecture • Over 93% of samples indicated Cs‐134 /Cs‐137 or I‐131 were not detected or were below the Japanese regulation values • Less than 7% were above the Japanese regulation values for Cs‐134 /Cs‐137 and/or I‐131 • Restrictions on the distribution and/or consumption of specific foods in certain areas of Fukushima and Ibaraki prefectures remain in place

9. 350 Total number of food samples tested between 19 and 31 May 2011 300 300 250 Number of samples Neg 200 Cs-total Cs-total & I-131 150 116 100 77 55 50 39 36 33 32 28 22 18 11 9 9 9 6 4 4 2 2 2 2 1 1 0 Prefecture

10. 20 Food samples above the regulation values between 19 and 31 May 2011 18 16 Cs-total 14 Cs-total & I-131 Number of samples 12 12 10 10 8 7 6 4 4 3 3 2 2 2 2 2 2 1 1 1 0 Prefecture / Date of sampling

11. 20 Food samples above the regulation values between 19 and 31 May 2011 18 16 Cs-total 16 Cs-total & I-131 14 Number of samples 12 10 10 9 8 6 6 5 4 2 2 1 1 1 1 0 Chiba / tea Fukushima / Fukushima / Fukushima / Fukushima / Fukushima / Fukushima / Gunma / tea Ibaraki / tea Tochigi / tea Algae Fishery Fruit Mushroom tea Tree / products perennial plant shoots Prefecture / food type

Radiological Monitoring and Consequences of Fukushima Nuclear Accident (2 June 2011)

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