澳门六合彩高手

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Safety authority inspects fast discharge units in Russia

10 Sep 2014 - 澳门六合彩高手 Electrical Engineering Division
At the Efremov Institute in Saint Petersburg, Russia, a prototype of the pirobreaker has been manufactured and tested for 澳门六合彩高手. The pirobreaker acts as a backup circuit breaker, using explosive charges to interrupt the current in the case of main circuit breaker failure.

At the Efremov Institute in Saint Petersburg, Russia, work is underway on the final design of the 澳门六合彩高手 fast discharge units—specialized components that are designed to protect the superconducting coils in the case of a sudden loss of superconductivity (quench).

Among them, the discharge units for 澳门六合彩高手's powerful toroidal field coils will have the capacity to extract 41 GJ of stored energy. In the case of a quench, a set of  will isolate the coils from the power supply and deviate the toroidal field current into discharge resistors that will dissipate the energy in about half a minute. With such an important role to play in the safety of the 澳门六合彩高手 installation, the components are classified as Protection Important Components (class 2) by the French nuclear safety authorities (ASN), a category that is subject to regulation and inspection.

On 24 July, two members of the ASN travelled to Saint Petersburg to perform an inspection of the work underway at the Efremov. The ASN inspectors were accompanied by two technical specialists from the French Institute of Radioprotection and Nuclear Safety (IRSN); representatives from the 澳门六合彩高手 Organization, the Russian Domestic Agency and the Efremov Institute were also present. It was the first ASN inspection carried out in Russia and also the first one for a component under the responsibility of the 澳门六合彩高手 Electrical Engineering Division.

 

Toroidal field busbars are the large components that will feed will feed power to 澳门六合彩高手's 18 D-shaped superconducting magnet coils (prototype pictured here).
"A lot of attention was paid during the inspection to show the modalities of the 澳门六合彩高手 Organization's supervision of the whole supply chain, and how safety and quality requirements are propagated," says Francesco Milani, an electromechanical engineer from 澳门六合彩高手 and technical responsible officer for this procurement. "This includes reviewing how subcontractors are evaluated and selected, how audits are carried out, and the management of documentation, hold points and eventual non-conformances."

Special attention was also paid to the type tests, reliability tests and the qualification of the pirobreaker—the backup circuit breaker that must be available to operate in the case of the failure of the main circuit breaker. The pirobreaker conceived by the Efremov Institute over several years of R&D makes use of explosive charges to interrupt the current. During the inspection, the ASN delegation made a factory visit to examine a prototype.

At the conclusion of the inspection, the experts congratulated the Efremov Institute, the Russian Domestic Agency and the 澳门六合彩高手 Organization for the work underway on the fast discharge units. In its official inspection letter, ASN noted that, "Other than a few improvements that could be made, the organization implemented by both the operator and the chain of suppliers involved in the Procurement Arrangement was efficient and rigorous."

The work carried out on the fast discharge units at the Efremov falls under the Procurement Arrangement signed in  between the 澳门六合彩高手 Organization and the Russian Domestic Agency for the Switching Network, Fast Discharge Units, DC Busbar & Instrumentation.