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SMQ > Week 4 > Flashcards

Week 4 Flashcards

1
Q

What does a pressurised water reactor contain?

A

Fuel plates which house U235
Hafnium control rods
Pressurised water

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2
Q

How is the rate of energy controlled and who controls it?

A

By raising or lowering control rods, operated by RPO

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3
Q

What are the types of SCRAM

A

Automatic Scram
Manual Scram
Partial Scram (From lowering group 3)
Full Scram (All 4 groups lowered)

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4
Q

Name the four plant states?

A

A
H
B
C

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5
Q

Plant State A

A

At least ONE condition met

Reactor may or may not be critical

More than one control rod is energised

Primary coolant pressure above 35 bar

Primary temp above 168C

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6
Q

Plant State H

A

ALL conditions met

Reactor is shut down with no more than ONE control rod energised

Primary coolant below 35 Bar

Primary coolant temp 93C - 168C

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7
Q

Plant state B

A

All conditions met

Reactor is shut down with no more than one control rod energised

Primary coolant pressure below 35

Primary coolant temp below 93C

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8
Q

Plant State C

A

ALL conditions met

Reactor is shut down and all CRDM’s are defused

Primary coolant pressure is below 35

Primary coolant temp is below 93C

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9
Q

What are the primary and secondary containment boundaries?

A

Primary: Hull surrounding reactor compartment RSC and Tunnel

Secondary:
Minimum - pressure bull between 26 and 88 bulkhead
Maximum - entire pressure hull

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10
Q

Function of nuclear steam raising plant (NSRP)?

A

Produce high-quality steam using heat from the fission produced in PWR

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11
Q

Components of NSRP?

A

Reactor pressure vessel
Fuel
Control rods
Control and drive motors (CRDM)
Primary circuit
Main cooling pumps (MCPs)
Steam generators
Pressuriser

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12
Q

How are the crew protected from radiological hazards?

A

Time
Distance
Shielding
As low as reasonably practicable

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13
Q

Hazards associated with steam systems?

A

Scalding
Burning
Potential lagging fires

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14
Q

Key operating parameters of the primary systems?

A

Pressure
Flow
Temperature

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15
Q

The 6 watch keepers for the primary/secondary system?

A

MRS
RPO
EPO
MMSS
METOW
MMSWK

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16
Q

Components of the secondary system?

A

Steam generators
Turbo generators
Isolation valves
Main engines
Condensers
Extraction and Feed pumps

17
Q

Where is the secondary propulsion system located?

A

3 main ballast tank

18
Q

Key operating parameters of the secondary system?

A

Steam pressure
SG level
Condenser vacuum
Condenser hotwell level
Feed pump discharge pressure
Feed water chemistry
SFWC temperatures
Lub oil temp and pressure
Voltage and frequency

19
Q

What is wrapped around the steam generators to keep them cool?

A

Tube banks

20
Q

What speed does the emergency propulsion system operate at?

A

4-6 knots

21
Q

State the advantages of a propulsor over a conventional propeller?

A

More efficient
Quieter
Less prone to cavitation

22
Q

What equipment does the main lubricating oil system provide lubrication for?

A

Main engine
TGs
Gearbox and shafting equipment
Main circ Pp bearings

23
Q

What are the items of equipment fwd of 64 WTB which are supplied by the chilled water system?

A

Sonar cabinet space cabinets
Astute combat management systems cabinets
COH2 burners
CO2 removal plants
Electrolysers
Gas management plant
Ships stores refrigeration plants
Air handling units
LP blower oil cooler

24
Q

What are the major components of the main AC system?

A

TGs
Non-essential switchboards
Non-essential load centres
Essential switchboards
Essential load centres
AC diesel generator
Main static converters (MSC)
Shore supply

25
Q

Major components of the main DC system?

A

Main battery
Main static convertors (MSCs)
DC diesel generator
DC shore supply
Emergency propulsion system (EPS)
Main DC switchboards

26
Q

Components that make up the general layout of the Astute 400Hz AC system?

A

No 1 400Hz static converter
No 2 400Hz static converter
400Hz distribution panel
Submarine Weapon Interfact Manager starter (SWIM)
Main circuit breaker panel (MCBP)

27
Q

What are the 3 main supply voltages within the AC system?

A

440V
115V
230V

28
Q

What are the nuclear steam raising plants two normal operating modes?

A

Full power state, which provides full power
Half power state, which provides a maximum of 70% of full power

29
Q

Describe how the transfer of energy occurs within the steam generators?

A

Heat transfer occurs from primary coolant to secondary feedwater via tube banks in SG
That produces steam, which is transferred to the main steam range via pipework and valves

30
Q

What are the hazards associated with the main battery?

A

Electric shock
Harmful gases
Acid burns

31
Q

What are the normal modes of operation for the chilled water system at sea and in harbour?

A

At sea: two out of three plants running
Third plant as standby
In harbour: one plant running as required

32
Q

Function of the main static converter?

A

Provide a reversible power link between the main AC system and the main DC system

33
Q

Function of the main AC circuit breakers?

A

Protect personnel and equipment
Connect and disconnect from the system

34
Q

How many pairs of TRDU are there?

A

3 pairs

35
Q

Function of the transformer rectifier?

A

Transforms and rectifies the 440V AC voltage to 24V DC

36
Q

What is the nominal voltage of the main battery?

A

250V DC

37
Q

What are the 2 modes of the main static converters?

A

Voltage sensing mode
Frequency sensing mode

38
Q

Function of the astute 400Hz AC system?

A

Sonar
Radar
SWIM

SMQ (7 decks)

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