Systems Exam 1 - Print Reading Flashcards
What does this relay or contact do?
23
temperature control device
What does this relay or contact do?
25
synchronizing check
What does this relay or contact do?
27
undervoltage
What does this relay or contact do?
33
position switch
(detects position of something)
What does this relay or contact do?
42
running circuit breaker
(480V power source to motor)
What does this relay or contact do?
49
thermal overload relay
What does this relay or contact do?
50
instantaneous overcurrent
What does this relay or contact do?
51
time overcurrent
What does this relay or contact do?
52a
contact position follows breaker
(usually open when de-energized)
What does this relay or contact do?
52b
contact position opposite of breaker
(usually closed when de-energized)
What does this relay or contact do?
52h
contact position is based on breaker position
(racked in, racked out, test)
What does this relay or contact do?
52e
contact changes state earlier than other, similar contacts
What does this relay or contact do?
59
overvoltage
What does this relay or contact do?
63
pressure switch
What does this relay or contact do?
64
ground protective relay
What does this relay or contact do?
74
alarm relay
What does this relay or contact do?
86
lockout relay
86-1: phase to phase - “one and done,” can’t keep running
86-2: phase to ground, can keep running
What does this relay or contact do?
87
differential protective relay
(generating devices)
What is safety class 1 for piping?
failure could cause a condition III or condition IV loss of reactor coolant
What is safety class 2 for piping?
piping penetrating reactor containment which forms part of containment penetration boundary and piping in the RHRS, ECCS, H2, Control System, and MS or FW systems inside containment
What is safety class 3 for piping?
failure would result in a radioactive release to the environment, or piping in systems that provide or support safety systems, control containment releases, or remove decay heat from spent fuel
What is safety class 5 for piping?
Non-Nuclear Safety (NNS) piping located in Seismic Category 1 structures
What is safety class G for piping?
Non-Nuclear Safety (NNS) piping NOT located in Seismic Category 1 structures
Relay/Contact Suffixes
x, y, or z
auxiliary relays
Relay/Contact Suffixes
O
opening relay
Relay/Contact Suffixes
C
closing relay
Relay/Contact Suffixes
CS
control switch
Relay/Contact Suffixes
PB
push button
Device Designators
TDPU
time delay pickup
contacts typically change state at some set time interval after the device is actuated
Device Designators
TDDO
time delay dropout
contacts typically change state at some set time interval after the device is de-energized
Device Designators
TDC
time delay closing
Device Designators
TDO
time delay opening
What do the different parts mean in pipe designators?
Example: 16-CT-1-003-151R-2
16 - nominal pipe size (16”)
CT - system (CT: containment spray)
1 - Unit 1
003 - line number within that system)
151R - piping category (R = potentially radioactive)
2 - safety class
What kind of valve is this?
gate valve
What kind of valve is this?
double disc gate valve
What kind of valve is this?
globe valve
What kind of valve is this?
needle valve
What kind of valve is this?
plug cock valve
What kind of valve is this?
ball valve
What kind of valve is this?
diaphragm valve
What kind of valve is this?
hermetically sealed valve
What kind of valve is this?
butterfly valve
(flanged or wafer type)
What kind of valve is this?
post indicator valve
What kind of valve is this?
fire protection post indicator valve
What component is this?
vacuum breaker
What kind of valve is this?
float check valve
What kind of valve is this?
stop check valve
What kind of valve is this?
safety or relief valve
What kind of valve operator is this?
air diaphragm operator
What kind of valve operator is this?
piston operator
What kind of valve operator is this?
manual gear operator
What kind of valve operator is this?
extension stem operator
What kind of valve/operator is this?
throttling
What does this symbol mean?
alarm annunciator
(if two of these symbols on the same sheet share the same subscript, they have a common annunciator window)
What does this symbol mean?
reactor trip annunciator
(“first out”)
What does this symbol mean?
turbine trip annunciator
How can the I&C drawing be found if given the Mechanical drawing number?
Change the leading 0 to a 2, e.g. M1-0225 becomes M1-2225.
As electrical print number increases, complexity…
increases
How are relays and contacts shown on drawings?
de-energized
A motor with a circle beside it denotes…
HP rating
A motor with a box beside it denotes…
space heater rating
