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Publicatie Laka-bibliotheek:
Trawsfynnyd - Power at a price

Auteur	FOE
Datum	oktober 1987
Classificatie	2.05.8.70/01 (GROOT-BRITTANNIË - TRAWSFYNYDD)
Voorkant

SECTION 1 
SUMMARY OF REPORT

Trawsfynydd is a unique nuclear power plant in Britain in being located on an 
inland lake. The liquid radioactive discharges are of greater significance than those 
from other UK nuclear power plants due to the limited volume of water available 
for dispersion.

The results of this survey of official CEGB and MAFF discharge and monitoring data, 
plus Friends of the Earth's own monitoring data lead to the following conclusions:

* Liquid discharges from the nuclear station show erratic trends which do not appear
to match with the levels of contamination detected in the lake in both mud and fish. 
* Whilst overall discharges have, according to the CEGB, decreased from peak levels
in 1981 (for tritium) and 1978 (excluding tritium), trends for a number of significant 
radionuclides such as Cobalt-60, Caesium-134 and 137 do not follow this trend.
- caesium-134 and 137 levels, whilst lower than the peak discharge level in 1978,
have shown an increasing trend over the past three years.
- strontium-90 discharges have been extremely erratic since 1978, with increasing
and decreasing levels in alternate years since 1979. 
* Monitoring results from MAFF show confusing trends, but with significantly
increasing levels of Cobalt-60, and Caesium-134 and 137 in mud over the past 
three years. Caesium-137 and Cobalt-60 levels are at their highest since 1977. CEGB 
discharge figures do not explain this trend.
* The increasing contamination levels of Cobalt-60 in mud points toward a serious
corrosion problem in the plant in the period from 1982 onward. 
* In contrast to increasing contamination levels in mud, contamination levels in fish,
according to MAFF, are decreasing. These results are on the basis of a small number 
of samples however, and may be due to changes in the selection of the samples. In 
our view the MAFF monitoring programme is inadequate and contrary to ICRP 
optimisation procedures, concentrates mainly on the radiocaesiums, with only
sporadic analysis of strontium-90 and the transuranic radionuclides. The next result 
is an incomplete picture of critical group exposures. 
* FoE's own monitoring data shows some significant differences when compared
to that produced by MAFF, particularly for Cobalt-60 levels in mud. It also confirms 
that caesium contamination levels in the lake have been maintained until late 1986. 
* The effective radiation dose-equivalent for the critical group of fish consumers
around Trawsfynydd is the highest for any CEGB power station in Britain by a 
significant margin. It is second only to Sellafield amongst all nuclear installations 
in Britain.

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