Week 4

Question 1

What does a pressurised water reactor contain?

Answer 1

Fuel plates which house U235
Hafnium control rods
Pressurised water

Question 2

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

Answer 2

By raising or lowering control rods, operated by RPO

Question 3

What are the types of SCRAM

Answer 3

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

Question 4

Name the four plant states?

Answer 4

A
H
B
C

Question 5

Plant State A

Answer 5

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

Question 6

Plant State H

Answer 6

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

Question 7

Plant state B

Answer 7

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

Question 8

Plant State C

Answer 8

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

Question 9

What are the primary and secondary containment boundaries?

Answer 9

Primary: Hull surrounding reactor compartment RSC and Tunnel

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

Question 10

Function of nuclear steam raising plant (NSRP)?

Answer 10

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

Question 11

Components of NSRP?

Answer 11

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

Question 12

How are the crew protected from radiological hazards?

Answer 12

Time
Distance
Shielding
As low as reasonably practicable

Question 13

Hazards associated with steam systems?

Answer 13

Scalding
Burning
Potential lagging fires

Question 14

Key operating parameters of the primary systems?

Answer 14

Pressure
Flow
Temperature

Question 15

The 6 watch keepers for the primary/secondary system?

Answer 15

MRS
RPO
EPO
MMSS
METOW
MMSWK

Question 16

Components of the secondary system?

Answer 16

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

Question 17

Where is the secondary propulsion system located?

Answer 17

3 main ballast tank

Question 18

Key operating parameters of the secondary system?

Answer 18

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

Question 19

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

Answer 19

Tube banks

Question 20

What speed does the emergency propulsion system operate at?

Answer 20

4-6 knots

Question 21

State the advantages of a propulsor over a conventional propeller?

Answer 21

More efficient
Quieter
Less prone to cavitation

Question 22

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

Answer 22

Main engine
TGs
Gearbox and shafting equipment
Main circ Pp bearings

Question 23

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

Answer 23

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

Question 24

What are the major components of the main AC system?

Answer 24

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

Question 25

**Major components of the main DC system?**

Answer 25

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

Question 26

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

Answer 26

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

Question 27

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

Answer 27

440V 115V 230V

Question 28

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

Answer 28

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

Question 29

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

Answer 29

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

Question 30

**What are the hazards associated with the main battery?**

Answer 30

Electric shock Harmful gases Acid burns

Question 31

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

Answer 31

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

Question 32

Function of the main static converter?

Answer 32

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

Question 33

Function of the main AC circuit breakers?

Answer 33

Protect personnel and equipment Connect and disconnect from the system

Question 34

How many pairs of TRDU are there?

Answer 34

3 pairs

Question 35

Function of the transformer rectifier?

Answer 35

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

Question 36

What is the nominal voltage of the main battery?

Answer 36

250V DC

Question 37

What are the 2 modes of the main static converters?

Answer 37

Voltage sensing mode Frequency sensing mode

Question 38

Function of the astute 400Hz AC system?

Answer 38

Sonar Radar SWIM