|Nyt om atomkraftulykken i Japan
den 30. september 99.
E-mail afsendt fra Japan 18. oktober
Mon Oct 18 07:58:41 1999
Date: Mon, 18 Oct 1999 13:40:36 (lokal tid) +0900
From: firstname.lastname@example.org (Hosokawk)
Subject: MagpieNews #991018 (Tokai accident-21st report)
Magpie Country Nukes Headliner
nuclear issues news brief from Japan
Criticality accident at Tokai uranium processing plant
MUCH WORSE PUBLIC EXPOSURE TO RADIATION REVEALED BY EXPERT
TRADE UNION RESEARCH; GOVT FAILED TO EXPAND THE EVACUATION ZONE
18 October 1999
**** correction ****
In the 19th Report of MagpieNews on Tokai criticality accident, the indication of the
volume/number of the British scientific journal was inadequate.
"Nature Number 401" should read as follows:
Nature, volume 401, number 6753, dated 7 October 1999.
Magpie apologizes for any inconveniences our readers may have had.
The union of the employees of JAERI (Japan Atomic Energy Research Institute, see ##th
Report) worked out an independent estimation of the total radiation dose at 17 monitoring
points around the JCO Tokai accident site. The result of their calculation was reported in
Mainich Newspaper on 16 and 17 October nationwide. It unequivocally shows that
evacuation of at least 600m radius zone (rather than the actual evacuation of 350m zone)
should have been encouraged, as it was revealed that the anual dose limit of 1mSv had been
reached even at a 400m point.
It has also been revealed that the Government's emergency responce unit (headed by the
Prime Minister Obuchi) was about to issue the evacuation order for 500m zone, but it was not
issued since it was after midnight (i.e. early hours of 1 Oct) and it was raining (so a panic
could easily be caused). As a result, the population in 350m to 600m zone was left in the
According to NHK (national TV/radio network) news on 18 October, STA (Science and
Technology Agency of the Japanese Government) plans to extract the uranyl nitrate solution
that remains in the precipitation tank in which the fissile uranium elements went criticial.
However, the dosage rate in the reconversion test building in which the tank in question is
installed is still as high as over 10mSv/h (gamma, or gamma + neutron?). Anybody who
approaches the tank will be dosed with unacceptably high amount of radiation. STA says they
will sort out an operational procedure with certain time limit so that rad-exposure can be
minimized, and hopes to carry out the operation before the end of this week. They declines to
Radiochemically speaking, retrieving the solution is of crutial significance in understanding
the nature and extent of the accident. Qualitative and quantitative analysis of the fission
products (such radionuclides as barium, ruthenium, molybdenum, cerium, etc) that are
contained in the solution will render an exact estimation of the number of nuclear fissions
(thus the number of neutrons and energy generated).
How many people must be exposed how much to the very dangerous level of radiation just in
order to obtain several decilitters of the solution, which is a sufficient amount for the analysis,
is a hard question, both in terms of science and of justice.
OOA, Blegdamsvej 4 B - st, 2200 Kbh. N.
Tlf: 35 35 55 07, Fax: 35 35 65 45
Sidst opdateret 19. oktober 1999