Nuclear Services NTS

Equipment Obsolescence Solutions

As part of our core portfolio of Nuclear-related services, NTS focuses on the selection of new nuclear grade components, their qualification, and, if needed, their dedication for safety-related applications. We currently offer qualified replacements for many electrical and mechanical safety-related components that are no longer available from the OEM.

NTS certifies equipment for Class 1E installation for mild or harsh environments to IEEE 323 and IEEE 344. These systems include instrumentation, digital recorders, batteries, gauges, motors, panels and chillers from manufacturers such as Bussman, Siemens, Yokogawa and GE. NTS can also provide engineering evaluations to determine the best potential replacement from over 200 manufacturers of nuclear grade equipment. With a focus on solving plant needs, NTS leads the industry in digital upgrades, MCC bucket replacements, motor rewinds, governor rebuilds, modifications to or design of replacement safety-related systems, and instrumentation panel and component design. All programs are conducted in accordance with 10CFR50 App. B and 10CFR21.

EPRI NP-5652 Nuclear Dedication

Through membership and direct participation in industry task groups, NTS maintains a leading edge in the industry. NTS participates in developing standards, guidelines and resolution of key NRC questions regarding critical characteristics verification, sampling, traceability, surveys, and like-for-like replacements. NTS's nuclear staff meets ANSI N45.2.6 Level II Inspector requirements. Our nuclear dedication programs utilize the best approach for each application and nuclear safety related product. NTS also provides technical evaluations, critical characteristics and safety class determinations.

Seismic and Equipment Qualification Engineering

NTS's qualification data bases help identify potential problems during prequalification. Often, upgrades can be based on prior NTS testing. Our large engineering staff and in-house test facilities fully support field teams, including a complete architectural and engineering division.

Specific capabilities include:

  • Retrofit qualification and testing
  • Qualification assessment and upgrades
  • Equivalency testing for replacement parts
  • Predictive maintenance programs
  • Plant life extension (PLEX) consulting
  • Commercial grade dedication and assessment
  • Materials aging data base services
  • Seismic analyses and upgrades

NTS helps to resolve licensing issues or support hardware retrofit and replacement programs to meet customer specifications, regulatory codes, and requirements. NTS's seismic and EQ test services include:

  • Thermal and radiation aging
  • Seismic testing
  • Accident (Loss of Coolant Accident (LOCA)) testing
  • Functional monitoring
  • Test procedure preparation
  • Modal analysis and testing
  • Fixture design and fabrication

NTS operates 3 separate single axis, triaxial and biaxial seismic machines, plus numerous accident and aging chambers, assuring a quick response to customers’ needs.

Seismic and Nuclear Testing Services

We house more than 30 different Aging Ovens that are available for environmental qualification programs. Thermocouples and electronic temperature controllers are used to maintain the specified thermal aging temperature. Temperatures are continuously recorded and maintained within +5/-0°F of the specified thermal aging temperature. Redundant controllers are used to prevent overheating of the test samples in the event of a malfunction of the main controller. 

In addition to the aging ovens, the NTS Nuclear Center of Excellence has a LOCA Test Facility that has five permanent LOCA test chambers. These test chambers are provided with saturated and superheated steam, compressed air, and water or chemical spray. Test samples installed in the LOCA test chambers can be provided with various electrical and mechanical inputs. Test chamber and test sample operability parameters are recorded on a state-of-the-art digital data acquisition system.