General Flashcards
State the basic function of Nuclear Steam Supply System (NSSS) process instrumentation?
(in accordance with AX6AU01-00526?)
MPC –> Monitor, Protect, Control
MONITOR - measure plant parameters for alarms & indications, process control and protective functions such as trips.
PROTECT - use measured plant parameters as inputs to safety systems to protect the three barriers to fission product release. (FRC –> Fuel cladding, RCS pressure boundary, Containment)
CONTROL - use measured plant parameters as inputs for either manual or automatic control of that parameter.
List the types of parameters monitored by the NSSS 7300 Process Instrumentation?
(and include specific examples of each in accordance with AX6AU01-00526?)
TEMPERATURES
PRESSURES
LEVELS
FLOWS
[acronym –> TPLF]
Chemical Volume & Control System (CVCS) –> (TLF)
Safety Injection (SI) –> (TPLF)
Residual Heat Removal (RHR) –> (TPF)
Identify the types of cabinets used in 7300 Process Instrumentation in accordance with AX6AU01-00526?
per each Unit:
PROTECTION set cabinets (QPS1, QPS2, QPS3, & QPS4)
CONTROL cabinets (QPC1, QPC2, QPC3, & QPC4)
BOP PROTECTION cabinets (QPP1, QPP2, QPP3, & QPP4)
BOP CONTROL cabinets (QPCG & QBCP)
14 cabinets per Unit.
DIM
Director InterModule signal (digital; typically switches grounds, low Voltage/low Current under 26V)
[NEAR field signal –> stays in the controlroom]
DIF
Director InterField signal (digital; typically 125VDC or 120VAC)
[FAR field signal –> leaves the controlroom]
Describe the importance of isolating protection channels from control channels?
(in accordance with AX6AU01-00526)
PROTECTION channels –> are required to protect the the core and/or prevent damage to the reactor coolant system and containment boundaries. They must meet strict guidelines: using redundant channels, installed online testing capability, separating the redundant channels both electrically and physically.
CONTROL channels –> or non-protective channels provide for and improve the economic operation of the plant but are not needed to protect the core or maintain containment integrity.Control channels must be isolated from protection channels to prevent control channel faults from degrading the protection channels performance.
From memory, interpret the various symbols, lettering, and numbering schemes used on process control block diagrams and interconnecting wiring diagrams in accordance with AX6AU01-00526.
???
Definition of RELAY in the 7300 system?
The term relay used here is standard instrument nomenclature not meaning an electrical coil and contact device but any device that is a signal modifier.
The letter “R” located near a component symbol, signifies what?
The letter “R” located near a component symbol signifies the component is mounted in the 7300 process cabinets or “racks”.
A line through the component symbol, signifies what?
A line through the component symbol signifies the component is mounted on the main control board.
PP/ —>
INJECTION POINT symbol
PP/
TEST POINT symbol
PY
RELAY symbol
PI
INDICATOR symbol
PS
SWITCHING FUNCTION sysmbol
