Wylfa Newydd Nuclear Power Station

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Wylfa Newydd Nuclear Power Station

Received 13 August 2018
From Za Zemiata/Friands of the Earth Bulgaria


If such a severe accident happens, what are the consequences?
The inventory and source term of an ABWR can show us the maximum amount of radioactive material that can be expected to be released into the environment. In a study from 2014 the inventory of an ABWR was described as follows: Data on possible ABWR inventories are not publically available. However, neutronic characteristics of ABWR and the reactor type ESBWR allow calculating an ABWR core inventory based on an ESBWR inventory by multiplying with a factor of 0.86. The Cs-137 inventory of an ABWR can therefore be assessed as 507 PetaBq (PBq). Under the assumption of the study that 58% of the Cs-137 could be released in case of a severe accident, a release of 294 PBq can be expected in worst case.
The project flexRISK made a dispersion calculation based on real European meteorological conditions to show how the released radioactive material will be spread all over Europe. For this assessment a Cs-137 release of 61.5 PBq was assumed which is less than the inventory of an ABWR and less than the assumed severe accident in the above mentioned study.
The following figures show weather situations leading to a maximum contamination of Bulgarian territory from the Wylfa site.
Parts of the Bulgarian territory could be contaminated with up to 50 kBq Cs-137/m2 (the olive scale). This could be similar to the contamination after Chernobyl when the average contamination in the south of Bulgaria was about 12 kBq/m2.

In case of a severe accident in Wylfa with a containment failure, whole of Europe could be contaminated severely.
Request: Any new NPP in UK needs to prove that a severe accident with a containment failure is not possible!
Request: If an accident happens, it has to be guaranteed that the full damage will be covered.