View our Video: Actual video footage of a Solidstate Controls' Inverter undergoing a seismic test on a tria-axial "shake table" at Wyle Laboratories.
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United States
Class 1E:
"The safety classification of the electrical equipment and systems
that are essential to emergency reactor shutdown.
Containment isolation, reactor core cooling and containment, and reactor
core heat removal are essential in preventing significant release of radioactive
material into the environment."
MOTHER STANDARDS:
IEEE 344:
Recommended practice for seismic qualification of Class 1E equipment for
Nuclear Power Generating Stations.
IEEE 323-1974 and IEEE 323-1983:
Standards for qualifying Class 1E equipment for Nuclear Power Generating
Stations for:
- Aging
- Radiation
- Thermal
- Mechanical Vibration
- Seismic IEEE
344-1971
- Seismic IEEE
344-1971
MILD ENVIRONMENT:
Defined by IEEE 323 as:
"An environment of normal service conditions where seismic is the only
design basic event of consequence."
However, IEEE 323-83, Section 6.2 states the following:
- Aging analysis done on all devices/ components including material make up
- Radiation and higher than normal ambient temperature is factored into aging criteria (Station Black-Out conditions)
- Determine qualified
life and replacement/ maintenance schedule to achieve 40 year design
life
IEEE 344-1971
"Recommended practice for seismic qualification of Class 1E equipment
for
Nuclear Power Generating Stations"
- IEEE 344-1975
- IEEE 344-1987
Simulates earthquakes:
Equipment must operate during and after at least five (5) Operating Basic
Earthquake (OBE) events, and at least one (1) Safe Shutdown Earthquake
(SSE) event.
DAUGHTER STANDARDS:
IEEE 650-1979 & 1990
"Standard for qualification of Class 1E battery Chargers and Inverters
for Nuclear Generating Stations"
- Specific procedures to meet aging requirements of IEEE323
- Failure Modes and Effects Analysis (FMEA)
- Electrical stress analysis
- Pre and Post seismic environment stress test
IEEE 944-1986
- Design criteria for Inverters and Rectifier/ Battery Chargers, Bypass transformers, and Voltage Regulators
- Electrical testing criteria
NEMA PE-5:
- Utility type Battery
Chargers
- Design criteria
for Rectifier/ Chargers
- Electrical test
criteria
IEEE 996-1985
"IEEE recommended practice for design of safety related DC auxiliary power
systems for Nuclear Power Generating Stations"
- Battery Charger sizing criteria
- Distribution systems and equipment
- Spare/swing Battery
Chargers
IEEE 383-1980
"Standard for the type testing of Class 1E electric cables, field splices,
and connections for Nuclear Power Generating Stations"
- Cable must utilize
certified insulation system, and must pass vertical and horizontal flame
test per IEEE383
IEEE 384-1981
"Standard criteria for independence of Class 1E rated equipment and circuits"
- Physical and electrical separation criteria
- Non-Class 1E circuits from Class 1E circuits (critical vs. non-critical)
- May require additional "isolation" devices
IEEE 519-1992
"Recommended practices and requirements for harmonic control in electrical
power systems"
- Newly re-written to include reflected current harmonics from rectifiers and battery chargers
- Does not recommend
the use of 3 SCRs (3-pulse designs) for Rectifiers
OTHER STANDARDS
NEMA ABI-1986
"Standard for the
testing of molded case switches"
- Certified testing results that breakers meet specified trip ratings and electrical criteria
- Note: Solidstate
Controls buys directly from the O.E.M.
- Breakers are serialized for traceability
- Certified Test
reports are issued for:
- Complete functional tests
- Tripping time(s)
- Dielectric
tests
EPRI 102323, Revision I
"Guidelines for Electromagnetic Interference Testing in Power Generating
Plants"
- EMI/RFI
- Conducted
- Radiated
- Equipment susceptibility
Meeting
the 40 Year Design Life | Qualifications
for Class 1E Equipment
Nuclear Background and Experience
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