Bulletin 1/2011 - Siempelkamp

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at the StS location in Lünen, Germany. these parts include seals, electrical and hydraulic components. Do you need specially trained personnel to perform the service? Bernd-Dieter Wessolowski: We have mechanics and electronic technicians work ing in service. the team consists of eleven employees from MSDG and 25 employees from StS. For the opening and closing of a reactor pressure vessel four people are deployed. An important element for service work in a nuclear power plant is the documentation. Each individual procedure is written down. In France alone, we are able to carry out five deployments simultaneously! Which factors were most convincing to the customer within the frame of this project? <strong>Siempelkamp</strong> MST in France: 900 MW pressurized water reactors: 1· Bugey 2· Cruas 3· Dampièrre 4· Gravelines (two stud tensioning machines) 5· Fessenheim 6· tricastin 1300 MW pressurized water reactors: 7· Cattenom 8· Golfech 9· Flamanville (1+2) 10· nogent 11· St. Alban 1400 MW pressurized water reactors type N4: 12· Civaux 13· Chooz EPRTM reactor: 14· Flamanville 3 Herman Vervliet: Our price-performance ratio which ranges from new deliveries of stud tensioners to moderni zations as well as service. Furthermore, we stand for absolute adherence to sched ules, providing the operator with qualified personnel, and customer service tailored to French procedures. We also possess all the relevant certifications necessary to perform our tasks. Let’s take this a step further: Are there other STS products in connection with stud tensioners which could be of interest to the French nuclear market in the future? Bernd-Dieter Wessolowski: yes, the development of cleaning devices for reactor pressure vessel studs, nuts, and blind holes as a supplement to our service package. the concept: a stand-alone machine for the dry-cleaning of studs and nuts which Brest 14 9 Nantes Caen LOIRE BORDEAUX Bordeaux Biarritz Le Havre Tours Poitiers La Rochelle 12 Garonne 8 Loire SieMpelkaMp | nUCLEAR tECHnOLOGy degreases, cleans and re-greases. the prototype of such a cleaning device is currently being tested in one of our shops. Because of the trust in our proven and reliable quality of many years, we have already received an order for six of these cleaning devices from EDF. After completion of the test period, our customer will receive an optimized version of the product which is tailored to the customer’s appli cation in its nuclear power plants. Thank you for the interview. We wish you continued success for the German- French partnership! Calais Dordogne ROUSSILLON Lille Seine Cher Tarn Reims CHAMPAGNE PARIS Straßburg 3 4 Toulouse Perpignan 10 13 BURGUND Rhône Marne Dijon Marne JURA 1 Lyon RHÔNE 11 Grenoble 6 ELSASS Nizza LANGUEDOC PROVENÇE Montpellier 2 7 Marseille 5
SieMpelkaMp | nUCLEAR tECHnOLOGy How does a stud tensioners work? the reactor pressure vessels in nuclear power plants are opened at intervals of approximately twelve to 18 months for replacing spent fuel elements with new ones and to carry out the tests stipulated by the government authorities. the reactor consists of the bottom part, the reactor pressure vessel, and the top part, the cover. these two parts are pressed against each other by up to 72 studs and nuts distributed at equal intervals on the circumference of the vessel. to open the reactor, the up to 2 m long studs are simultaneously extended in length by 4 mm, with hydraulic pressures of approximately 1,000 t applied to each stud and pressures of up to 3,000 bar; the specialist calls this procedure stud tensioning. By this means the nuts can be released without requiring large forces. thereafter, the studs are screwed out and transported separately or with the stud tensioner to a storage location in the reactor building. the reactor pressure vessel closure head is then lifted off the bottom part, and the pressure vessel is in the opened state. In the latest generation of the stud tensioners, the simultaneous hydraulic elongation and turning of the studs is only one of many available functions. the transport of the reactor studs and cover nuts, as well as the measurement, acquisition and recording of all relevant operating conditions and parameters, are integrated in the system. For example, during a tensioning process, the actual stud elongation is electronically recorded, displayed on a screen on the control panel of the tensioning device and stored via a PC. thus, after completing a tensioning process a confirmation of the proper closing of the reactor vessel can be retrieved. Lowering of the stud tensioner into the reactor cavity Mounting of coupling mechanisms to the MST Left: Service employees in German nuclear power plant; Right: French colleagues of the MSDG 58 59 Inserting of cables into the cable duct of the MST Electrical inspection of the rotary drive for the nuts Maintenance of the double turning device
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