§ Mr. Foulkesasked the Secretary of State for Scotland, further to his reply to the hon. Member for Carrick, Cumnock and Doon Valley on 13 January, Official Report, column 161, concerning critical groups of members of the public exposed to radiation in the vicinity of British Nuclear Fuels Limited, Chapelcross, whether the Scottish Development Department statistical bulletin contains details of exposure from direct emissions of radiation from the plant as are measurable at the perimeter fence; what is the critical group of members of the public exposed to the highest doses from such direct emissions; whether any member of that group is also exposed to radiation by other pathways; and if he will make a statement.
§ Mr. AncramScottish Development Department statistical bulletin No. 4/1984 is mainly concerned with monitoring in respect of radioactive waste discharges, but it also confirms that exposure of the public in the vicinity of Chapelcross, taking account also of direct radiation from the reactors themselves, has remained within internationally recommended limits.
§ Mr. Foulkesasked the Secretary of State for Scotland if he will publish a list of the estimated maximum 660W exposures of any member of the public in the vicinity of British Nuclear Fuels Limited, Chapelcross, showing: (a) the dose equivalent in each year of operation, expressed in millisieverts and (b) the average dose equivalent of the 10-year period ending in each recent year, expressed in millisieverts; what changes in such maximum exposures are expected to take place following the revised certificates of authorisations for Chapelcross issued in April 1986; and if he will make a statement.
§ Mr. AncramNo. Doses are calculated in relation to critical groups and not to individuals. Assessments of critical group doses resulting from waste disposals are published regularly. The information for 1984 and 1985, which will be published shortly, confirms that doses arising from discharges from Chapelcross remain very small and well within internationally recommended limits. No significant change is anticipated following the revision of the certificates of authorisation in April 1986.
§ Mr. Foulkesasked the Secretary of State for Scotland, further to his reply to the hon. Member for Carrick, Cumnock and Doon Valley on 13 January, Official Report, column 161, concerning the new certificates of authorisation for radioactive discharges from British Nuclear Fuels Limited, Chapelcross, what maximum annual exposure expressed in millisieverts has been calculated for any member of the public in the case that annual discharges occured at 100 per cent. of the maximum authorised levels; what exposure pathways contribute to such a calculated dose; and if he will make a statement.
§ Mr. AncramThe authorised limits are set in accordance with the relevant standards with sufficient margin in hand to ensure that critical group doses will not exceed the recommended limits even if discharges continue at the maximum permitted levels. Exposure pathways are described in statistical bulletin No. 4/1984.
§ Mr. Foulkesasked the Secretary of State for Scotland, further to his reply to the hon. Member for Carrick, Cumnock and Doon Valley on 13 January, Official Report, column 161, concerning the table on page 2 of the Scottish Development Department's statistical bulletin No. 4 1984, if he will publish a table showing a summary of exposure pathways in the vicinity of Chapelcross in each year from 1981 to 1983, expressing the effective dose equivalents in millisieverts rather than percentages; whether such calculated exposures in each year take account of the 1982 habits survey and the latest physiological uptake factors now available; and if he will make a statement.
§ Mr. AncramThe bulletin to be published with monitoring results for 1984 and 1985 will include assessments of critical group doses in the terms requested and will take account of all available relevant information. Bulletin No. 4/1984 contains the information necessary to convert dose assessments for previous years.
§ Mr. Foulkesasked the Secretary of State for Scotland, further to his reply to the hon. Member for Carrick, Cumnock and Doon Valley on 13 January, Official Report, column 161, concerning an updated table similar to that on page 2 of the Scottish Development Department's statistical bulletin No. 4 1984, in what month he expects a new bulletin to be published containing information for years up to and including 1985.
661W
§ Mr. AncramI hope that the new bulletin will be published next month.