In October 2017 Sempell received an order for the delivery of 6 Pressurizer Safety Relief Valve Stations (PSRV) for a New Build Project NPP Hinkley Point C Units 1 + 2. The delivery of the valve stations is scheduled for the year 2021.
Two new power plants based on EPR technology (European Pressurized Water Reactor) will be built for the Hinkley Point Nuclear Power Station located on the Somerset coast in South-Western England.
Two new units will have a design net power output each of 1.600 Mwe.
Sempell has concentrated with the pilot-operated safety valves Type 99 on a solution with media operation according the pressure release principle.
Three discharge trains provided with the pressurizer safety relief valves will be installed on the top of the pressurizer.
For each discharge train, the corresponding safety relief valve inlet is connected to the pressurizer with a DN150 nozzle connection and outlet to a discharge collector with a DN 200 pipe. The discharge collector collects the discharge of the three pressurizer safety relief valves.
Each pressurizer safety relief valve is equipped with:
- two spring loaded pilots (“SIERION”) mounted in parallel, were one of the two spring loaded pilots is used as a backup;
- two solenoid pilots mounted in series;
- one manual isolation valve for a pressure sensor connection.
A linear position indication sensor will be installed at the main valve. Each pilot valve will be equipped with two stem limit switches, indicating open and closed position.
The flow direction is from the pressurizer to the pressurizer relief tank.
Sempell was recently awarded with a contract for Nuclear Power Plant Hinkley Point C. The Nuclear Power Plan Hinkley Point will be extended by two new units in the EPR design (AREVA).
The contract includes the supply of eight Main Feedwater Damped Check Valves (MFDCV). The damped check valves are designed for the feedwater system to protect the main feedwater line and the connected steam generator.
Rapid changes in mass flows in high-pressure lines can cause pressure surges and forces which exceed the permissible material strength limits. Consequently, particular importance is placed on the closing behavior of check valves after a break has occurred in high-pressure pipes.
The qualified Sempell damped check valve design was developed to prevent the pressure surges resulting from double-end fractures in the feedwater lines of nuclear power plants and the need to be able to control such incidents without consequential damage to the shut-off piping system. As new nuclear power plants have to be operated within a wide load range, the Sempell design also fulfills the requirement of a stable, full open position adapted to the minimum load cases. At the same time the valves are optimized for pressure loss.
To demonstrate their suitability for pipe-break protection in feedwater lines, blowdown tests have been performed with a DN 350 valve in the HDR Kahl experimental power plant, realistically simulating a double-ended pipe break.
In March 2017 the last of a total of 236 isolation valves were delivered for NPP Tianwan Unit 3 and 4 in China. The PWR Units 3 and 4 are type VVER 1000/428M and will be equipped by the Russian company Atomstroyexport. The different gate and check valves are designed for the core cooling system, the main steam system and the sprinkler system. The contract includes 84 gate valves type GPS5 NPS 300 and 52 check valves type HKS5 NPS 300 made of forged steel for the high pressure ranges and additional 8 gate valves type GPS5 NPS 600, 68 gate valves type GPS3 NPS 300 and 24 check valves type HKS5 NPS 300 for the intermediate pressure ranges. Despite initial challenges faced during the manufacturing of the valves, all of which were successfully resolved by Sempell in close cooperation with Atomstroyexport and the end-customer Jiangsu nuclear power cooperation Ltd., the project delivery schedule was successfully fulfilled and valves of excellent quality were delivered to the site. The commissioning of the power plant is scheduled for 2018.
Emerson acquisition of the Valve & Controls Business of Pentair plc.
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GE Power is building a new coal-fired power plant at Opole for Poland’s largest energy sector company PGE Capital Group (PGE). The power plant will consist of two 900 MW ultra-supercritical units 5 & 6 and once in operation, it will be the country’s second-largest hard coal-fueled facility, supplying electricity to the equivalent of four million homes. The higher steam parameters of GE’s ultra-supercritical plant technology will result in a higher electrical output while burning less coal compared to the other older units in Poland and will enable PGE to reduce its environmental impact and meet regulatory requirements. The steam conditions (HP Turbine inlet 600° @ 251 bar / Reheat 610°C) of the ultra-supercritical design also allowed Sempell to leverage the best of its core power product offerings. As a result GE Power awarded Sempell orders for the valves on the boiler and turbine island. The order included high pressure bypass valves, reheater safety valves and further control, check and isolation valves.
The LEAG (Lausitz Energie Kraftwerke AG) will replace the High Pressure Bypass Valves in the 800MW units A and B of the lignite-fired power plant Schwarze Pumpe (Germany). Sempell was awarded the order to deliver eight valves of type 315 with downstream desuperheating. Sempell has excellent know-how and many years of experience in this segment and provides a universal design with the atomizing steam desuperheater. With this, maximum requirements on control conditions, cooling capacities and steam cooling up to the limit of saturated steam can be realized. Sempell’s special spray steam nozzle meets all these requirements for cost-effective and optimal results of steam cooling by splitting the flow into a central and a jacket steam jet.
In November 2016 Sempell successfully finalized the factory acceptance tests of primary circuit control valves ZBS5, former Babcock type 346-626, for NPP Rovno and NPP Kozloduy. The valves will be installed in the TK80-system of these VVER10007320 reactors. The function of the ТК80 system is the coolant withdrawal from the primary circuit and it is composed of a regenerative heat exchanger TK80W01, bleed water subcooler TK80W02 and the control valves TK81S02 and TK82S02. The valves ТК81S02 and ТК82S02 are designed for the set coolant flow rate to be withdrawn from the primary circuit – “bleed” of the primary circuit. The valves ТК81S02 and ТК82S02 are also designed for the support of the set pressure by the change of bleed water flow rate through the valves during tightness pressure test of the primary circuit. The design pressure of the valves is 17,6 MPa, the design temperature is 350 degrees Celsius. The valve ensures a Kv = 4,6 m3/h and was adapted to demanding operation conditions with high differential pressures to be controlled. The valve is of bellow sealed type with Z-shaped body.
Forsmark 1, 2 and 3 will be equipped with an Independent Core Colling System. In case of an incident of ELAP – Extended Loss of ordinary AC Power or LUHS – Loss of normal access to Ultimate Heat Sink the reactor is feeded with water from an external tank to keep the reactor core cooled and covered with water
Sempell GmbH was awarded to deliver the Internal and External Isolation Valves for this application. The valves will be designed acc. to KBM/TBM ed. 7.0, Safety class 1 and Seismic Category 1.
The Internal and External Isolation valves are installed in series on the downstream side to avoid reversal flow. The Internal Containment Isolation Valve is a check valve type HKS5. The External Containment Isolation Valve is a check valve Type ZBS51 with blocking stem and electrical Actuator.