Sizewell ``B`` steam generator and pressurizer nozzle inner radius inspections

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:72586

McNulty, A L ^[1]

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1. OIS plc, Stockton (United Kingdom)

The Steam Generators (S.G) and Pressurizer in the Sizewell ``B`` reactor are classed as Incredibility of Failure (IOF) components. Consequently all the welds and nozzle inner radii are subject to Pre-Service Inspection (PSI). It is intended that these components will be periodically inspected over the life of the plant (ISI) using the PSI inspection techniques. The inspection techniques, the operators, and the equipment used are subject to an independent validation at the Inspection Validation Center (IVC) of AEA Technology Risley. The ultrasonic inspections are fully automated. All the inspections are being carried out from the outside surface. The inspection targets are defects 10mm through wall {times} 20mm long. The defects to be detected are ultrasonically smooth or rough and have orientations within 10 degrees of the radial--axial plane of the nozzle. i.e., 10 degrees tilt and 0 degrees skew, 0 degrees tilt and 10 degrees skew or their vectorial sum. OIS are contracted to undertake the PSI for the plant owner Nuclear Electric (NE). The technique development and proving trails and the validation experience to date is described in the paper.

• OSTI ID: 72586
• Report Number(s): CONF-931061--; ISBN 0-87170-506-0
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
DATA
DATA ANALYSIS
DATA PROCESSING
INSPECTION
MANIPULATORS
NOZZLES
PRESSURIZERS
SIZEWELL-B REACTOR
STEAM GENERATORS
ULTRASONIC TESTING
VALIDATION