Technical Briefing on Radiological Situation in Japan - 21 March 2011

1. Opening Remarks – Technical Briefing (21/3/2011)
1. Current Situation
We are seeing some steady improvements, but the overall situation at the Fukushima Daiichi
nuclear power plant remains very serious. High levels of contamination have been measured
in the locality of the plant.
The restoration of electrical power to Unit 2, which we reported yesterday, is good news. AC
power is available and an electrical load check to pumps etc. is currently on-going. Work on
the restoration of off-site power to Units 3 and 4 is also underway.
Seawater is still being injected into the reactor pressure vessels of Units 1, 2 and 3.
Pressure in the reactor pressure vessel and the containment vessel drywell at Unit 3, which
had been rising yesterday, has again fallen.
Water is being sprayed periodically into the spent fuel pools at Units 2, 3 and 4. The Agency
still lacks data on water levels and temperatures in the spent fuel pools at Units 1, 2, 3 and 4.
Following the restoration of cooling at Units 5 and 6, temperatures in the spent fuel pools
continue to decline.
2. Radiation Monitoring
As I reported yesterday, the IAEA radiation monitoring team took measurements at distances
from 56 to 200 km from the Fukushima nuclear power plant. At two locations in Fukushima
Prefecture gamma dose rate and beta-gamma contamination measurements have been
repeated. These measurements showed high beta-gamma contamination levels. Measurements
by the IAEA and the Japanese authorities were taken at the same time and locations. The
Japanese and independent IAEA measurements gave comparable results.
Measurement of gamma dose rate and beta-gamma contamination were taken on 20 March at
more locations. The dose-rate results ranged from 2-160 microsieverts per hour, which
compares to a typical natural background level of around 0.1 microsieverts per hour. High-
levels of beta-gamma contamination have been measured between 16-58 km from the plant.
Available results show contamination ranging from 0.2-0.9 MBq per square metre.
Further measurements are needed to assess possible contamination beyond the area currently
monitored – both closer to the facility and further way. We have no contamination
measurements showing that that contamination levels are high at greater distances than 58 km
from the plant, but this cannot be excluded.
I have no further information available regarding the measurement of alpha radiation. As I
reported yesterday, from the measurements taken within the evacuation zone (20 km), no
significant alpha radiation had been detected at that time.
In the coming days, the IAEA monitoring team will continue to take measurements in the
Fukushima prefecture. We are seeking data from Japan on radioactivity contamination
measurements for the rest of Japan.

2. Some results on the monitoring of foodstuffs have been made available by Japan to the IAEA
and FAO. Results provided recently by the Japanese authorities range up to 55,000 Bq per kg
of I-131 in samples of Spinach taken in in the Ibaraki Prefecture. These high values are
significantly above Japanese limits for restricting food consumption (i.e. 2,000 Bq/kg). I
understand that the Japanese Government is actively considering relevant precautionary
measures and has instructed four Prefectures (Ibaraki, Totigi, Gunma, Fukushima) to refrain,
for the time being, from distributing two types of vegetables (spinach and kakina) from these
Prefectures and milk from Fukshima.
3. Agency Activities
The Director General briefed the Board of Governors today on the outcome of his visit to
Tokyo.

3. Unit 1 2 3 4
Power (MWe /MWth) 460/1380 784/2381 784/2381 784/2381
Type of Reactor BWR-3 BWR-4 BWR-4 BWR-4
In service – auto In service – auto In service – auto
Status at time of EQ Outage
shutdown shutdown shutdown
Core and fuel integrity Damaged Damaged Damaged No fuel in the Reactor
RPV & RCS integrity Unknown Unknown Unknown
Not applicable due to
Containment integrity Not Damaged Damage suspected No information outage plant status
AC Power available –
AC Power Substation connected Not available Not available
Load check is ongoing
Building Severe damage Slight damage Severe damage Severe damage
Around half of Fuel is Around half of Fuel is Around half of Fuel is
Water level of RPV
uncovered (Stable) uncovered (Stable) uncovered (Stable)
Pressure of RPV Stabilized Unreliable Readings Decreased Not applicable due to
CV Pressure Drywell Stable Stable Decreased outage plant status
Water injection to RPV Seawater Seawater Seawater
Water injection to CV No information No information No information
Periodic spraying from Periodic spraying from Periodic spraying
Spent Fuel Pool Status No information
outside outside from outside
3/21/2011 07:00 AM

4. Unit 5 6
Power 784/2381 1100/3293
Type of Reactor BWR-4 BWR-5
Status at the EQ occurred Outage Outage
Core and Fuel Cold Shutdown Cold Shutdown Severe condition
RPV & RCS integrity Intact Intact
Containment int. No damage expected No damage expected Concern
AC Power 2nd Emergency diesel from Emergency diesel
Unit 6 Off-site power being restored No immediate
concern
Building No damage reported No damage reported
Water level of RPV Above fuel Above fuel
Pressure of RPV Cooling restored Cooling restored
Containment Pressure No information No information
Water injection to RPV Injection in Progress Injection in Progress
Water injection to CV Not needed now Not needed now
Spent Fuel Pool Status Cooling restored Cooling restored
3/21/2011 07:00 AM

5. Technical Briefing on the
Radiological Situation in Japan
21 March 2011
IAEA
International Atomic Energy Agency

6. Daiichi NPP On-Site gamma dose rate
(updated)
IAEA

7. Evolution of gamma dose rates after radioactive releases
surrounding Daiichi NPP since 15 March 2011
(Selected monitoring posts)
IAEA
Information provided by MEXT-Japan

8. Gamma dose rates North of Daiichi NPP
Japan (microSv/h), 15-20 March
IAEA

9. Gamma dose rates between Tokyo and Daiichi
NPP (microSv/h), 15-20 March
IAEA

10. Gamma dose rates close to Tokyo, (microSv/h),
15-20 March
IAEA

11. Measurements by the IAEA monitoring team on
20 March 2011
Location Distanc Time, JST Dose rate Alpha beta + Contamination
e to (24h) micro (counts gamma Becquerel per Mega‐
NPP Sv/h per (counts per cm 2 Becquerel
(km) second) second) per m2
Mini Stop near
Kawamata Hospital 58 10:32 5.7 0 3440 58.5 0.585
Nihonmatsu‐Towa‐
cho 52 10:55 4.2 0 2368 40.3 0.403
Towa‐cho Michino‐
eki 49 11:05 3.1 0 1270 21.6 0.216
At crossing of Road
349 and Road 50 46 11:30 1.9 0 1973 33.5 0.335
Suichuji bus stop 43 11:42 2 0 2260 38.4 0.384
JA Tamura 39 11:57 2.6 0 2265 38.5 0.385
Border between
Kuzuo‐mura and 34 12:09 11.7 0 3152 53.6 0.536
Tamura‐shi
Kuzuo village office 29 13:47 11.2 0 4874 82.9 0.829
Road 50 28 15:25 7.2 0 5030 85.5 0.855
Border between
Namie town and 20 14:55 161 0 overload na na
Kuzuo village
Gate of Ogaki‐dam
management office 16 14:31 83 0 overload na na
IAEA 7

12. Measurements by the IAEA monitoring team on
19 March 2011
Location Time, Distance Dose Alpha beta + Contamination
JST from rate (counts gamma
(24h) Fukushim (micro per (counts per
a Sv/h) second) second) Becquerel Mega‐
Daiichi per cm2 Becquerel
NPP (km) per m2
Saitama
Prefecture
Hasuda 17:00 200 0.04 0 27 ‐ -
Tochigi
Prefecture
Sano 17:27 180 0.16 0 150 2.5 0.03
Kamikochi 18:17 140 0.18 0.2 *) 240 4.1 0.04
Nasukogem 20:17 220 2.9 0 2300 39.3 0.39
Fukushimi
Prefecture
Abukuma 21:05 60 3.5 0.08*) 3750 64 0.64
Gohyakugawa 21:58 56 3 0 3900 66.3 0.66
IAEA 8

13. Maps with prefectures where foodstuffs
were measured
IAEA 9

14. Ibaraki: Results from measurements of
radionuclides in foodstuffs
Name Sampling Date Spniach & other leafy vegs Spring Onion Milk (unprocessed) UNITS
JST I‐131 Cs‐137 I‐131 Cs‐137 I‐131 Cs‐137 Cs‐134
Kitaibaraki 18‐Mar 24000 690 350 ND ‐ ‐ ‐ (Bq/kg)
Kamisu 17‐Mar 56 ND ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Yachiyo 17‐Mar 78 21 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Takahagi 19‐Mar 11,000 586 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hokota 19‐Mar 1900 71 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hokota 19‐Mar 480 81 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hitachi
City 18‐Mar 54100 1931 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hitachi
City 18‐Mar 25200 1105 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hitachi
Omiya 18‐Mar 19200 1040 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hitachi
Omiya 18‐Mar 17800 908 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Naka 18‐Mar 16100 911 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Naka 18‐Mar 13500 966 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Hokota 18‐Mar 7710 407 356 9 ‐ ‐ ‐ (Bq/kg)
Moriya 18‐Mar 2100 121 590 21 ‐ ‐ ‐ (Bq/kg)
Moriya 18‐Mar 26 ND ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Moriya 18‐Mar ND ND ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Koga 18‐Mar 4200 270 ‐ ‐ ‐ ‐ ‐ (Bq/kg)
Sakai 18‐Mar ‐ ‐ 140 ND ‐ ‐ ‐ (Bq/kg)
Sakai
IAEA 18‐Mar ‐ ‐ 120 ND ‐ ‐ ‐ (Bq/kg)