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NuclearPlantJournal.com Nuclear Plant Journal, July-August 2016
New
Documents
EPRI
1.
Nondestructive Evaluation: Industry
Best Practices for Performing Reliable
NDE - Implementation Guide
. Product
ID: 3002007329. Published April, 2016.
Operating experience with in-service
inspection (ISI) of nuclear power plant
components includes cases in which
poor practices for planning, execution,
or data review resulted in issues with
the reliability or efficiency of the
examination. These issues have, in some
cases, resulted in degraded examination
performance, such as failure to achieve
the required examination coverage,
identification of service-induced defects
where none existed, or failure to identify
service-induced defects. As a result
of recent events, the Nondestructive
Examination (NDE) Improvement Focus
Group (NIFG) was chartered to review
the industry’s NDE practices and develop
guidelines and recommendations intended
to improve the ultrasonic examination of
dissimilar metal welds. Based on the NDE
reliability improvements of the resulting
NIFG products (Electric Power Research
Institute [EPRI] reports 3002000091,
3002000204, and 3002002048), the
NDE Action Plan Committee (APC)
requested that additional NDE guidance
be developed by collecting industry best
practices into a single document to assist
station NDE personnel with planning and
executing all NDE with the same high
standards of reliability. This report is the
result of that request.
2.
2015 State-of-the-Fleet Assessment of
Flow Accelerated Corrosion Program
Effectiveness
. Product ID: 3002008126.
Published May, 2016.
Flow-accelerated corrosion (FAC)
is a degradation mechanism that affects
piping and equipment in fossil and
nuclear power plants. Because of the
numerous problems caused by FAC,
nuclear utilities maintain programs
aimed to control its harmful effects.
These programs generally consist of a
combination of analysis, inspections,
repairs, and replacements. The Electric
Power Research Institute (EPRI) has
been a leader in supplying technology in
support of these tasks.
The objective of this project was to
develop a benchmarking resource for
programmatic aspects of FAC programs
that helps utilities improve the efficiency
and effectiveness of their individual FAC
programs.
3.
Development and Application of a
New Seismic PRA Methodology for
Determining Seismic Fragilities Using
Scenario Earthquakes
. Product ID:
3002008098. Published June, 2016.
The
standard
approach
for
incorporating seismic hazard in a seismic
probabilistic risk assessment (SPRA) is
to use a uniform hazard spectra (UHS).
The UHS is computed independently at
each spectral frequency such that it has
an equal probability of exceeding the
ground motion at any frequency. As a
result, the UHS may not be representative
of an actual earthquake spectrum, and
is potentially a source of conservatism
in SPRA methodology. This report
documents the investigation of a new
approach to calculate seismic fragilities
based on the development of a suite
of realistic scenario earthquakes (time
histories or response spectra) as a possible
alternative to the UHS in an SPRA.
4.
Plant Engineering: Emergency
Diesel Generator Turbocharger End-of-
Expected-Life Guidance
. Product ID:
3002002999. Published June, 2016.
The purpose of this report is to
present the results of an end-of-life
(EOL) study on the emergency diesel
engine turbochargers that are in service
at nuclear power generation stations. The
study is based on reviews of historical
industry operating experience (OE)
and on consultations with nuclear plant
subject matter experts (SMEs) regarding
the issues affecting the expected life of
the turbochargers. The OE was analyzed
using a probabilistic failure model that
can be used to assess the vulnerability
of the turbochargers to an EOL situation.
Existing maintenance practices were also
reviewed for potential impacts on the
turbocharger service life.
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