|Nyt om atomkraftulykken i Japan
den 30. september 99.
E-mail afsendt fra Japan 16. oktober
Sat Oct 16 04:08:34 1999
Date: Sat, 16 Oct 1999 10:21:28 (lokal tid) +0900
From: email@example.com (Hosokawk)
Subject: MagpieNews #991016 (Tokai accident-20th report)
Magpie Country Nukes Headliner
nuclear issues news brief from Japan
Criticality accident at Tokai uranium processing plant
ANOTHER 2-DIGIT TRICK! DOSE WAS 120 RATHER THAN 20;
STA REPORT SAYS MORE PEOPLE RADIATED; MORE ON RADIOACTIVE IODINE
16 October 1999
More sloppy (and outrageous) stories from the JCO Tokai accident.
Earlier, JCO spokesman disclosed individual radiation exposure doses of the workers who
had engaged in the dangerous operation to control the criticality (see 10th Report, 12th
Report). One member of the first team who approached the building to take photographs of
the pipe systems they were going to work on, according to this original JCO statement, was
dosed with 20mSv.
Now it is revealed that the workers wore 2-digit type neutron recorders, i.e. the meter is reset
to "00" when the count is over 99. Yes, "20mSv" was actually 120mSv! (119.79mSv to be
exact; neutron plus gamma, mostly consisting of neutron dose.)
The fact was reported by STA (Science and Technology Agency of the Japanese
Government) to the accident investigation unit of NSC (Nuclear Safety Commission of the
Japanese Government) yesterday (15 Oct).
The tentative risk assessment we reported earlier (see 16th Report) was based on the earlier
data (i.e. 20mSv). So we underestimated the life risk.
In the same report, STA confirmed that the number of the exposed was 69. This figure does
NOT include the general public who had stayed very close to the plant for over 5 hours in
neutron shower before they evacuated. MagpieNews estimate, though roughly, that some 100
to 150 population was significantly exposed to neutron radiation. (see 19th Report).
At a press conference yesterday (15 Oct), JCO admitted that radioactive iodine-131 was still
leaking. They had no filter to trap iodine gas in the exhaust system. They said they would put
additional filters today (16 Oct) to reduce the emission of radioactivity into atmosphere.
The problem is that STA knew all this all the time. STA should have ordered JCO to do this
much earlier. Critics say that STA and JCO may be expecting to reduce the contamination
inside the building by releasing the contaminants out into atmosphere, so that liquidating
work can be started as early as possible.
OOA, Blegdamsvej 4 B - st, 2200 Kbh. N.
Tlf: 35 35 55 07, Fax: 35 35 65 45
Sidst opdateret 19. oktober 1999