Pressure | Temperature | Level | Flow | Calibration Nuclear power generation

Alexander Wiegand, Chairman and CEO, WIKA About us As a family-run business acting globally, with over 9,300 highly qualified employees, the WIKA group of companies is a worldwide leader in pressure and temperature measurement. The company also sets the standard in the measurement of level and flow, and in calibration technology. With manufacturing locations around the globe, WIKA ensures flexibility and the highest delivery performance. Every year, over 50 million quality products, both standard and customer-specific solutions, are delivered in batches of 1 to over 10,000 units. Founded in 1946,...

Contents Global presence Safety in the event of failure Classified instrumentation Unclassified instrumentation Global safety requirements Calibration technology WIKA – Your partner in nuclear power generation In many systems within a nuclear power plant, both in the primary and also the secondary circuits, not only are pressure, temperature and level measuring instruments from WIKA used, but also their primary flow elements are too. Due to the extremely strict safety standards, the demands on measurement technology are very high. Electronic, mechatronic and mechanical measuring instruments for...

All around the world – Close to the customer With manufacturing locations around the globe, we ensure the highest flexibility and delivery performance. Some WIKA manufacturing locations: Germany (HQ), Australia, Brazil, Canada, China, India, Italy, Korea, Malaysia, Poland, Russia, Singapore, Switzerland, South Africa and USA Proximity to our customers is essential for efficient solutions. Whether standard products or custom designs: Working with you we'll find the right concepts for your requirements. To meet this demand wherever it arises, we are a strong group of companies with a worldwide...

Safety in the event of failure Safety in the event of failure After the Fukushima reactor disaster, the safety procedures in nuclear plants have once again been questioned the world over, particularly whether their resistance to natural disasters is sufficient. As a result of this, the whole safety infrastructure of nuclear power plants and their design have been reevaluated. The analyses have, among other things, shown that the monitoring systems for cooling ponds for beyond-design events must be improved. Through the consideration of new failure scenarios, the safety standards and, with that,...

Measuring instruments for the monitoring of levels and These therefore deliver essential information on the actual temperatures in the processes of a nuclear power plant are status of the parameters in the containment - even if other used before, during and after a severe accident. sensors in the vicinity have failed. Normal operation ■ Operational radiation dose: < 160 kGy Operation in the event of failure ■ Temperature in the event of failure: 208 °C (short-term temperature rise to 250 °C possible) ■ Pressure in the event of failure: to 10 bar abs. ■ Operation under failure conditions: 1 year...

Normal operation ■ Operational radiation dose: < 50 kGy ■ Response time without thermowell: from < 3.6 sec. Applications ■ Primary coolant pipes ■ Emergency cooling and residual heat removal systems ■ Cooling pond cooling systems Operation in the event of failure ■ Temperature in the event of failure: 156 °C ■ Radiation dose in the event of failure: up to 400 kGy cumulative Reference ■ Trillo (Spain)

Classified instrumentation As a result of the reevaluation of the accident scenarios, modification measures on the components of the safety systems (e.g. the emergency power diesel generators) and also on systems in the secondary circuit in the power house could be required. Here the name of WIKA also stands for reliability and competence; in product manufacture as well as in the consultancy, planning and design of measuring requirements.

■ Emergency power diesel Temperature measuring instruments, temperature switches and thermowells Pressure measuring instruments and pressure switches

■ Bypass level indicators Applications Capacitor Steam boiler Feed water system Lubricating oil system Industrial water system Coolant system ■ Magnetic float switches Reference ■ Leningrad II (Russia) ■ Taishan I+II (China)

Surface temperature probes Qualification Reference ■ Yangjiang 5+6 (China)

Diaphragm seal systems By using diaphragm seals, it is possible to adapt pressure gauges, , process transmitters, pressure switches or pressure sensors to even the most difficult of conditions in the nuclear power industry. A diaphragm made of the appropriate material separates the medium from the measuring instrument. Mounting may be made via a direct connection, a cooling element or a capillary. Pressure gauges The internal space between the diaphragm and the pressure measuring instrument is completely filled with a system fill fluid matched to the process. In order to be able to cope with...

■ Temperature: Filter room ■ Level: Condensate tank ■ Pressure: Containment vessel A core meltdown may cause damage to the reactor containment vessel due to overpressure. This overpressure is caused by the decay heat in the containment vessel and must be limited. To achieve this, “filtered containment pressure relief systems' are used. Specifically for these applications, different diaphragm seal systems are used. Reference ■ Tractebel (Belgium)

Feed water circuit High-pressure steam circuit Medium-pressure steam circuit Condensate discharge Make-up water circuit Cooling water circuit Compressed-air circuit Unclassified instrumentation Our portfolio for primary flow elements includes orifice plates, meter runs, flow nozzles, Venturi tubes and averaging pitot tubes. With our extensive product range we are in a position to cover almost all applications within power plants. As a result of our many years of experience, we can develop customised solutions to meet your specific needs. For many customers, the accuracy of the measurement is...