At around 12:42 pm on March 27, 2012, during the work to receive samples (water) for performance verification test of ALPS (Advanced Liquid Processing System) which were carried in from Fukushima Daiichi Nuclear Power Station, at Service Building of Unit 3 and 4 of Fukushima Daini Nuclear Power Station, our employee has found the spot contaminated with radioactive materials on the table next to the small monitor in the check point (uncontrolled area*1) to check the contamination of the goods when leaving controlled area.
Investigation for cause is currently underway.
The table where pollution was found and the area where pollution is suspected are set as a restricted area to prevent expansion of the contamination and are under control.
After the investigation, it was confirmed that the contamination on the table next to the small monitor in the check point was due to the spilled sample (water). The spilled amount was approx. 2.5 cc and the surface contamination concentration was approx. 206Bq/cm2 according to the measurement by the contamination survey meter.
During the investigation for the contamination in the entire route of sample transportation, 7 spots were confirmed to be contaminated (max above 700Bq/cm2). In order to prevent expansion of the contamination, 4 spots were decontaminated and 3 spots were temporarily put under control.
While inside of the vehicle transported such sample was also confirmed to be contaminated, outside surface of the vehicle nor the entrance area of the service building were not contaminated. Therefore, it is considered that the contamination is limited in the service building of Unit 3 and 4.
(Announced on March 27, 2012)
Today we received an instruction*2 from NISA on "Submission of a report on transportation of water for analysis from Fukushima Daiichi Nuclear Power Station to Fukushima Daini Nuclear Power Station" regarding contamination with radioactive materials in the uncontrolled area.
In reply to the instruction, we will promptly prepare and submit the report to NISA.
*1 uncontrolled area
Controlled area is an area where control is necessary to prevent unnecessary exposure to radiation and to prevent expansion of the contamination with radioactive materials. Uncontrolled area is area outside of the controlled area.
*2 Instruction to receive a report
"Submission of a report on transportation of water for analysis from Fukushima Daiichi Nuclear Power Station to Fukushima Daini Nuclear Power Station"
(March 27, 2012, NISA No.13)
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We have provided a Japanese press release version of the instruction document received from NISA. However, at this time we have reserved the right to not provide an English version due to potential misunderstandings that may arise from an inaccurate rendering of the original Japanese text. We may provide the English translation that NISA releases in our press releases. However, in principle we would advise you to visit the NISA website for timely and accurate information.
* We would like to make corrections to the press release published on March 27, 2012. We apologize for any inconvenience and would like to correct from the expression of "for analysis" to "for performance verification test of ALPS (Advanced Liquid Processing System)". (April 13, 2012)
