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Windsor, CT, United States

Lisowyj B.,Omaha Public Power District OPPD | Kuljis Z.,Westinghouse
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP | Year: 2010

After two decades of operation, austenitic stainless steel Control Element Drive Mechanism (CEDM) seal housings at a Pressurized Water Reactor (PWR) nuclear plant experienced Transgranular Stress Corrosion Cracking (TGSCC). In order to prevent the same cracking from occurring at the Fort Calhoun Nuclear Plant, a preventative program was initiated in 1999. All 37 CEDM seal housings have been inspected by using WesDyne Intraspect pancake and plus point eddy current probes. Examination of the eddy current data found that TGSCC was associated with localized areas of higher permeability (confirmed with a magnetometer). In order to quantitatively analyze the data, the normalized value from signal amplitude was defined as the arithmetic ratio between the absolute measurement of local permeability value (amplitude) and the eddy current signal value (amplitude) for the calibration standard axial notch. The data showed that in failed seal housings the normalized amplitudes were about three times greater than in non-cracked housings. Higher permeabilities were associated with cracked locations. The eddy current methodology therefore provides an empirical criterion to monitor when locally higher surface material permeability changes occur in order to determine the onset of TGSCC. © 2010 by ASME. Source


Gao Y.,Westinghouse | Anderson V.K.,NEI | Julka A.K.,700 Universe Blvd
PSAM 2014 - Probabilistic Safety Assessment and Management | Year: 2014

An overview and lessons learned of the latest 10 CFR50.65(a)(4) guidance update to include fire risk evaluations and its implementations in U.S. nuclear plants are presented. By December 1, 2013, all the US nuclear plants implemented this new NRC requirement for the Maintenance Rule (MR) (a)(4) program to include the fire risk evaluation and management actions as part of the existing at power MR (a)(4) program. This paper will introduce the background, the need, the requirement, the process and some of the implementation details of incorporating fire risk assessment within the existing MR (a)(4) program. This paper will also discuss some of the applicable program interactions within a nuclear plant, such as the interactions among Fire Protection, Appendix R PRA and Work Control programs and activities. All of these functions/programs are required to support a successful fire MR (a)(4) implementation. Some of the technical and implementation issues, such as use of safe shutdown analysis, qualitative and quantitative risk analysis application, equipment scoping and risk management actions are also discussed in the paper. Some of the lessons learned since the December 1, 2013 implementation of this new program are also presented. Source


Skillman W.A.,Westinghouse
IEEE MTT-S International Microwave Symposium Digest | Year: 2011

A radar is designed to meet customer specifications of range performance, angle accuracy, etc. However, an airborne radar must operate in an environment which may be different from the assumptions used in writing the performance specification. In an aircraft installation, the radar antenna is protected from the atmospheric environment by a radome which may introduce distortions and reflections of the radar energy. In some installations, such as AWACS, the aircraft may intrude into the near-field of the antenna, with subsequent distortions and reflections. The atmosphere between radar and target introduces diffraction effects which frequently cause fluctuation of the received target signal. The surface of the Earth acts as a large, complex target. Modern pulse Doppler radars use range-Doppler processing to separate airborne targets from the backscatter from the Earth (dubbed clutter). The antenna is designed with low side-lobes to minimize "side-lobe clutter" and with adequate system frequency stability to handle "main-beam clutter." The forward scatter from the Earth frequently causes the radar to see a mirror reflection of the desired target, apparently below the Earth's surface. This may cause undesired effects in tracking the target. This paper discusses these environmental effects revealed in flight testing of two Westinghouse radars. © 2011 IEEE. Source


Cohn M.,Westinghouse
IEEE MTT-S International Microwave Symposium Digest | Year: 2011

The Johns Hopkins University Radiation Laboratory was located in Baltimore, Maryland. Much of the early research at the Rad. Lab. was on proximity fuzes for surface based anti-aircraft artillery, evolving from World War II R&D. Pioneering work on millimeter wave propagation and component development was a major research effort during the early and mid 50's. The Director was Dr. Donald D. King. During his career Dr. King made many significant and documented contributions to the microwave technology. His career included the holding of many important positions in both the MTT-S and the IEEE culminating in being the President-Elect of the IEEE. © 2011 IEEE. Source


Dammann A.,ITER Organization | Antola L.,Amec Foster Wheeler | Beaudoin V.,ITER Organization | Dremel C.,Westinghouse | And 5 more authors.
Fusion Engineering and Design | Year: 2015

Internal components of the ITER Tokamak are replaced and transferred to the Hot Cell by remote handling equipment. These components include port plugs, cryopumps, divertor cassettes, blanket modules, etc. They are brought to the refurbishment area of the ITER Hot Cell Building for cleaning and maintenance, using remote handling techniques. The ITER refurbishment area will be unique in the world, when considering combination of size, quantity of complex component to refurbish in presence of radiation, activated dust and tritium. The refurbishment process to integrate covers a number of workstations to perform specific remote operations fully covered by a mast on crane system. This paper describes the integration of the Refurbishment Area, explaining the functions, the methodology followed, some illustrations of trade-off and safety improvements. © 2015. Source

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