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Tests are being carried out to pinpoint the cause of the latest leak at a nuclear power plant in southern France.
French energy company EDF says almost 100 staff were contaminated with a low dose of radiation during maintenance work on a closed-down reactor at the Tricastin plant near Avignon.
It is the second incident there in as many weeks, but officials are playing down the risk.
“We have an alarm system which is meant to protect the staff from contamination via the atmosphere,” said Alain Peckre, the director of the Tricastin nuclear plant.
“If a problem is detected, the alarms go off, our security procedures swing into place and everyone is evacuated from the building.”
On July 7, thirty cubic metres of effluent containing non-enriched uranium overflowed while a tank was being emptied. Tests showed that the ground water was contaminated even before the leak. Then on July 18 came a report of a second case at a plant 100 kilometres to the north. It was announced uranium may have seeped out of a broken pipe there for years.
The incidents have shaken confidence in France’s nuclear industry, the biggest in Europe. The government has ordered tests on all plants in the country to ensure similar leaks had not occurred elsewhere.
On July 7 and again on July 23, there were accidental leaks at the Tricastin Nuclear Power Center in France, which  is a collection of sites in four different communes: Saint-Paul-Trois-Châteaux and Pierrelatte in Drôme, and Bollène and Lapalud in Vaucluse.

Along with two other minor incidents on July 18, it has prompted the Commission for Independent Research and Information on Radioactivity (Criirad) to order a review of security and safety. Already last week, Environment Minister Jean-Louis Borloo said the ground water near all reactors should be tested and the state of waste storage sites assessed.
Cooling towers at Tricastin Nuclear Power Center 
In the latest incident, a hundred workers were exposed to radiation. They all work for Électricité de France (EDF), which runs the Tricastin facilities with Areva. This marks the largest number of workers to be collectively contaminated in French nuclear history.

The leak was at reactor number four, which was shut for refuelling. Workers were exposed to Cobalt 58 dust which escaped while maintenance work was being carried out. Sensors noticed a rise in the level of radiation and the workers were then evacuated.

"Seventy of them show low traces of radioelements, below one fortieth of the authorized limit," EDF said. A spokesperson later raised the number to 97 people. Criirad warned, however, that the limit was "not the level from which risk begins but the maximum acceptable level."

"We have an alarm system which is meant to protect the staff from contamination via the atmosphere,” said Tricastin director Alain Peckre. "If a problem is detected, the alarms go off, our security procedures swing into place and everyone is evacuated from the building."

A union representative from Confédération générale du travail (CGT) alleged that EDF was reducing maintenance and increasingly using sub-contractors, putting workers at risk in exchange for profitability.

"We spend 1.5 billion euros a year on ensuring our plants are in optimum condition," countered an EDF spokesperson. "Safety is our top priority over and above providing electricity to the network. Since our power stations were set up, 80 per cent of maintenance operations on reactors that have been temporarily turned off are carried out by external contractors. They are the most competent to maintain and repair specific parts of the reactor, some of which they have taken part in building."

The previous incident, on July 8, involved a 74kg spill of liquid containing unenriched uranium. Thirty cubic metres of water overflowed while a tank was being emptied. Subsequent test showed that contamination may have occurred for years.

Local wine growers Coteaux du Tricastin AOC have already become concerned about the negative association with "Tricastin" and have begun considering changing the name of their Appellation d'origine contrôlée (AOC).

"It's only a question of image as nuclear and food don't mix very well in consumers' minds," said the AOC's president, Henri Bour, to ''The Daily Telegraph''. Nuclear authorities "didn't understand our move, doubtless not wanting to admit that the nuclear industry's image is perhaps not perfect," he added.

"Nuclear was progress and we wanted that. We thought people were competent. Now we ask, were there previous incidents we weren't told about?" said local resident Roger Eymard to ''The Guardian''.

Autorité de sûreté nucléaire (ASN), a nuclear safety authority, has already criticised Areva for its handling of the first incident. ASN complained of poor communication with authorities and unsatisfactory security measures and operational procedures.

The leaks have occurred just as President Nicolas Sarkozy has been promoting the European Pressurized Reactor (EPR) as a solution to rising energy costs and global warming.

France has the second largest nuclear power network in the world and generates over 80% of its electricity through nuclear power.