Range of motors and alternators qualified for nuclear applications

19th June 2018
Posted By : Anna Flockett
Range of motors and alternators qualified for nuclear applications

Designing and manufacturing motors and alternators has been the job of Leroy-Somer for over 40 years, specifically for the nuclear industry. Many years of design discipline and experience allow the company to offer superior designed products meeting the requirements of the nuclear industry. Relying on a dedicated team of trained experts, Leroy-Somer ensures the global project management in order to offer the drive and energy generation solutions rigorously tailored to these sensitive applications, considering maximal reliability and lifetime.

Motors qualified for normal and accidental conditions and able to drive numerous functions
Leroy-Somer offers a wide range of nuclear motors used for driving auxiliaries, such as pumps, fans, valves, handling and compressors, either inside reactor building or inside conventional islands in nuclear power plants.

Designed to withstand the severe constraints of this industry, the Leroy-Somer low voltage induction nuclear motors range from 0.55-750kW and are available with air- or liquid cooling, depending on the application. They use the most up-to-date design techniques which provide a high level of robustness and reliability.

These motors satisfy the requirements of the main standards in force in the nuclear sector, notably qualification processes according to K1 - K2 - K3AD - K3, IEEE 1EB - 1EC, and have been designed in accordance with the most demanding technical and quality procedures, such as CST 74C014- CCTR, SC1 & SC2 seismic resistance, radiation from 5 to 850 kGy, decontaminable paint, GS-R-3 – SGAQ.

Energy efficiency is an additional asset of the nuclear motors as they offer standard IE2-IE3 Premium efficiency level, specified in the ErP EC/640/2009 directive.

Optimised alternators and regulators for emergency power supply
Leroy-Somer also provides the nuclear sector with a wide expertise in energy power, by offering superior designed alternators for generator sets that supply emergency backup power to the nuclear industry.

Optimised around specific engines and turbines to maximise reliability and lifespan, Leroy-Somer nuclear alternators range from 1-20MW in low- and medium voltage. These synchronous self-excited alternators are available in auxiliary winding AREP excitation with permanent magnet inductor (PMI) and can be equipped with single or double analogue AVR (Automatic Voltage Regulation).

Renowned for their high quality level, they are designed according to RCCE K3 requirement or IEEE 1E classification and can meet other nuclear design references upon request.

For maximum safety, the Leroy-Somer nuclear alternators have been qualified for sismic risks and for a 40- or a 60 year lifetime.

Compliance with standard requirements and safety
Qualified by numerous electricity operators including EDF, Tractebel, CGN, Vattenfall, OKG, Rosatom, the Leroy-Somer electric rotating machines meet the nuclear industry requirements as well as local and international standards applicable in Europe, America and China.

The Company's nuclear activities comply with IAEA (International Atomic Energy Agency) nuclear quality standards such as GS-R-3, and with the General Quality Assurance Requirements of EDF (main French electricity supplier) and ENGIE ELECTRABEL (Certificate of Authorisation). In addition, Leroy-Somer has recently renewed its HAF 604 certification (Design and Manufacturing) with the NNSA, the Chinese National Nuclear Safety Administration, for its motor operations.

At last, all Leroy-Somer personnel involved in nuclear activities are subject to special qualification procedures to ensure they completely take into account the nuclear manufacturing requirements in terms of compliance and traceability.

High-end and rigorous project management

Leroy-Somer has built a global organisation and processes connecting some of the best experts in Motor & Drive systems and Power Generation around the world. This unique approach allows for global project management, with direct input from R&D and Engineering

From initial specifications to equipment commissioning stage, including equipment qualification and personnel training, Leroy-Somer ensures an efficient execution of the contract during the design and manufacturing phase in close relationship with the operator or any other entity involved in the project.

As service remains one of the priorities for Leroy-Somer, whatever the country in the world, users always have a certified Leroy-Somer service centre close by to give advice in the choice and commissioning of products, spare parts availability and after-sales service assistance for the nuclear industry.


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