The Westinghouse Sigma Reactor Coolant Pump Seal provides reliable performance and costs savings to support safe and long-term plant operation.
The Sigma seal was developed from 30-plus years of positive operating experience and lessons learned with original #1 seal design, state-of-the-art design methods, and a complementary full-scale testing facility to create a fit, form and functional replacement seal that meets the demands of today’s PWR fleet.
The seal design integrates seamlessly into the existing plant equipment and is compatible with the Westinghouse SHIELD® Passive Thermal Shutdown Seal resulting in a comprehensive and cost-effective sealing solution that provides unprecedented reliability and service life with integrated passive safety features.
Westinghouse Reactor Coolant Pump #1 Sigma Seal. Applicable to Models 93, 93A, 93A-1, 93D and 100A/D
Qualified to work seamlessly within the plant’s existing operating and licensing basis, the Sigma seal design is capable of providing up to 12 years of continuous operation with reliable seal performance.
The Sigma seal includes a hydrostatic number 1 double-delta channel seal (DDCS) that offers stable leakage between 2.5 and 3.5 GPM and integrates design features that offer*:
The Sigma number 1 seal will be available starting in fall 2018.
Sigma and SHIELD are trademarks or registered trademarks of Westinghouse Electric Company LLC, its affiliates and/ or its subsidiaries in the United States and may be registered in other countries throughout the world. All rights reserved. Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners.
*Based on industry statistics of current and previous seal designs