Exam (elaborations)
BWR OVERVIEW
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Exam of 6 pages for the course A level Biology at A level Biology (BWR OVERVIEW)
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BWR OVERVIEWAC distribution system - correct answer-provides electrical power for station loads as
required during all modes of plant operation
345kV - connect to power core
161kV - powers the plant/start up
69kV - supplies the emergency station transformer
standby AC power system - correct answer-provides a single failure proof source of
electrical power (4160vac) adequate for the safe shut down of the reactor following various
abnormal operational transients and certain postulated accidents
these are our diesel generators
DC distribution system - correct answer-125V and 250V power systems provide an
uninterruptible source of power to all normal and emergency 125/250 power loads under all
plant operating conditions
Service Water System (SW) - correct answer-provides cooling water during normal operating
or accident conditions. ultimate heat sink for equipment through the plant
4 pumps in intake structure
RHR service water booster system - correct answer-provides cooling water to residual heat
removal (RHR) heat exchangers. unlimited source of water from the Missouri river to be
used for emergency core flooding and cooling
heating, air conditioning, and ventilation system (HVAC) - correct answer-protects equipment
and personnel from extremes of temperatures.
used to regulate pressure within certain areas of the plant therefore minimizing the spread of
airborne contaminants between controlled and uncontrolled areas (disposes them as well)
provides ventilation for rad waste
Process radiation monitoring system (PRM) - correct answer-ensures that the release of
radioactivity to unrestricted areas is within its permissible limits.
accomplished by continuously monitoring this release and by providing a warning if the
equipment malfunctions
area radiation monitoring system (ARM) - correct answer-detects, measures, and notifies
personnel of the intensity of radiation in working and storage areas within the plant.
radwaste system - correct answer-collects, processes, and disposes radioactive and/or
potentially radioactive wastes, such that the operation and availability of the station are not
affected and dose rates do not exceed the limits set by the Code of Federal Regulations
(solids, liquids, gases)
station heating boilers - correct answer-consists of two electrode boilers and their associate
support equipment to supply aux steam for the following: heat to buildings, space
, humidifiers, heat for AC systems reheat coils, equipment cleaning hose stations, emergency
supply to the main turbine gland sealing, test steam supply for RFP (reactor feed pump),
RCIC and HPCI.
water treatment system - correct answer-provide a supply of treated water suitable for plant
use to demineralizer units, fire flushing tanks, water treatment hose stations, and potable
water.
plant air system - correct answer-provides oil-free compressed air (service air) for operating
and maintenance functions.
SA is then filtered and dried to provide instrument air for pneumatic instruments and control
systems
(we want oil and water free air)
fire protection system (FP) - correct answer-provides adequate fire protection capability in all
areas of the station
overhead (manual firefighting, wet head sprinkler system, deluge system)
- low pressure carbon dioxide system
- diesel generator high pressure co2 system
-halon system used for SWP rooms, computer room, simulator (chemically interrupts a fire)
HWC gas generation system - correct answer-to change the reactor water environment so
that both intergranular stress corrosion cracking (IGSCC) and irradiation assisted stress
corrosion cracking (IASCC) are minimized in susceptible reactor plant materials (recirc
system piping and reactor vessel internals)
-accomplished by reduced the dissolved oxygen and peroxide concentrations in the reactor
water and limiting heat up and cool down cycles
nuclear boiler - correct answer-provides a region in which the core can be submerged in
water allowing power operation of the fuel. the reactor vessel internals maintain divisions
between the regions in the reactor vessel to provide correct coolant flow paths, allowing
power operation without fuel damage
nuclear boiler instrumentation - correct answer-monitor and transmit information concerning
key reactor vessel operating parameters to the main control room
nuclear fuel assemblies - correct answer-provides an assembly of fissionable material in the
form of fuel pellets inside of tubes called fuel cladding
fuel assembly allows efficient heat transfer to the coolant, provides structural support for the
fuel, and acts as a fission product boundary
neutron monitoring systems - correct answer-detect core conditions that threaten the core
overall fuel barrier integrity due to excessive power generation.
- provide signals to the reactor protection system (RPS) so the radioactive material release
from the fuel barrier is limited
-provide information for the efficient and expedient, operation and control of the reactor
-detect conditions that could lead to local fuel damage and to provide signals that can be
used to prevent damage so that station availability is not reduced
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