MORE than 60 anti-nuclear protesters were arrested yesterday after

breaking into the Sellafield reprocessing plant and blocking a main

access road to the site, but Greenpeace claimed last night that five

activists were still hidden inside the plant.

Around 100 campaigners breached security at the site on the Cumbrian

coast, but British Nuclear Fuels Limited, which runs the plant, denied

claims by Greenpeace that plutonium production had been halted.

Further claims by Greenpeace that activists had shut off a discharge

pipe at the Aldermaston nuclear weapons facility in Berkshire were

neither confirmed nor denied last night.

Police arrested 61 demonstrators during the six-hour Sellafield

protest, timed to coincide with the start of talks in New York yesterday

to review the Nuclear Non-Proliferation Treaty (NPT).

Those arrested were taken to Whitehaven police station in West

Cumbria, where eight were charged with offences including criminal

damage and obstruction and released on bail. The remaining 53 were

''being processed'', said police.

Greenpeace, which blocked a road into Sellafield with a 20ft

container, claims the plant is one of the world's leading producers of

plutonium -- a key component of nuclear bombs.

It also claimed to have anchored one of its ships, the Moby Dick,

close to a discharge pipe at the plant which, according to Greenpeace,

pumps high levels of radioactive waste into the Irish Sea.

Police confirmed that three protesters had tried to parachute into

Aldermaston -- but only one managed to get near the base.

A Ministry of Defence spokesman said it was impossible to concrete the

base's main discharge pipe without entering the base and there had been

no reported trespassers.

However, Greenpeace spokeswoman Janet Convery said activists had shut

off valves on a 10-mile water pipe from Aldermaston by striking at a

point near the Kennet and Avon Canal which is outside the base. An MoD

spokesman confirmed that a valve had been ''tampered with''.

Mr Bill Anderton, for BNFL, stressed that the Sellafield protest had

not affected plutonium production at the site's Thermal Oxide

Reprocessing facility (THORP).

Mr Anderton was unable to explain how the protesters entered the site

but said: ''Sellafield is about a mile by a mile-and-a-half and has a

wire fence around it. It's not possible to patrol every inch of it.'' In

a statement, BNFL criticised Greenpeace for linking the THORP plant with

the non-proliferation talks.

''THORP is a civil reprocessing plant and the uranium and plutonium

recovered from its operations are a valuable energy source.''

The THORP plant extracts uranium and plutonium from nuclear waste from

British and foreign reactors.

Its construction was fiercely opposed by anti-nuclear groups, who

claimed it would turn Sellafield in the ''world's nuclear dump''.