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Magnox Power Stations

Volume 983: debated on Friday 25 April 1980

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asked the Secretary of State for Energy what the present output of electricity is from Magnox power stations; and how this compares with the forecasted output when these stations were commisioned.

[pursuant to his reply, 24 April 1980, c. 207]: I am advised by the CEGB that the present total net output capacity of the eight CEGB Magnox stations is 3,427 MW, equivalent to 76 per cent. of their design net output capacity of 4,486 MW. Output from these stations in 1979 was 21·280 TWh averaging about 71 per cent. of present net output capacity and 54 per cent. of design net output capacity. It was originally assumed that these stations would operate on baseload with an annual average load factor of 75 per cent. subject to fluctuations from year to year arising from inspection and maintenance requirements. Power stations in Scotland are the responsibility of my right hon. Friend the Secretary of State for Scotland.

asked the Secretary of State for Energy what is the expected life at current levels of operation of each of the Magnox power stations.

[pursuant to his reply, 24 April 1980, c. 207]: I understand that, subject to obtaining safety clearances and continued economic operation, the CEGB expects that all its Mag nox stations will exceed their amortisation period of 20 years. Current estimates indicate that all these reactors are likely to have been withdrawn from use by the mid-1990s. Questions concerning the Magnox station at Hunterston are matters for my right hon. Friend the Secretary of State for Scotland.

asked the Secretary of State for Energy what was the announced output of each Magnox station in 1979 compared with both performance figures notified to the European Economic Community and to original planned output.

CEGB MAGNOX STATIONS OUTPUT 1979
1.2.3.4.
Average load as a percentage of capability based on*
StationElectricity supplied (TWh)Present net capabilityOriginal net capability
Bradwell1·3846453
Berkeley1·4746161
Dungeness A1·1653224
Hinkley Point A2·7897464
Oldbury3·1838761
Sizewell3·3119065
Trawsfynydd2·7748163
Wylfa5·2007151
* The average load is the number in the year. of TWh supplied during the year divided by the number of hour in the year

asked the Secretary of State for Energy what is the estimated cost of boiler defects and failures at the Wylfa Magnox station.

[pursuant to his reply, 24 April 1980, c. 207]: I am advised by the CEGB that the cost of the repairs to boilers at Wylfa carried out in the period 1971 to 1976 came to a total of £3·9 million.