List 1

Question 1

State the system code for the primary circuit?

Answer 1

System code M

Question 2

List the three containment boundaries

Answer 2

Primary boundaries
Secondary boundaries
Intermediate boundaries

Question 3

What is the function of the steam generators

Answer 3

Produce high quality steam for the operation of the operation of the main and turbo-generator (TG) turbines and Auxiliary steam systems

Remove decay heat from the reactor core using the SG cooldown system

Question 4

What is the function of the Auxilliary steam system

Answer 4

The function of the Auxilliary steam system is to supply steam at a constant pressure of 14 bar to the following equipment

• main air ejectors
• gland steam system
• distilling plant calorifiers

Question 5

Describe the basic operation of the gland steam system

Answer 5

Supply steam to seal the main engine and TG turbine glands to prevent air ingress into the turbines and escaping into the main machinery space (MMS)

Question 6

State two components of the steam drain system

Answer 6

Back pressure regulating valve (BPRV)
yarway steam trap
P.s key trap

Question 7

Label 5 items on the SG drawing

Answer 7

SG shell
Tube bundle
Downcomer
Feelwater main
Separator assembly
Set of drivers

Question 8

Why is there a separating wall between the ahead/astern sections of the main turbine?

Answer 8

An ahead/astern separating wall is fitted to prevent steam leakage between the two sections

Question 9

Name 5 parts of the sss clutch

Question 10

What is the system code for the primary relief system?

Answer 10

System code R

Question 11

What are the functions of the main circulating water system

Answer 11

Provide a flow of cooling water to the main condenser so that optimum condenser vacuum and steam conditions can be maintained in the main turbines and TG’s

Supply the after stern tube bearing with water for cooling and lubrication

Provide a supply of water to the clean sea water system

Question 12

Describe the construction of the clean sea water system pump

Answer 12

The clean sea water pump is a glandless, canned centrifugal pump. Each pump is solidly mounted on its own side main condenser hotwell

Question 13

Label the main feed system

Answer 13

Question 14

List 4 items cooled by the fwd ship’s fresh water cooling system

Answer 14

Chilled water plants (3)
70 Kw MG sets (2 for SWS)
35 Kw MG Sets (3 for Nav. RCMS And TWS)
10 Kw MG sets (2 for RCMS)
H2 Buners (2)

Question 15

What dose SLIV stand for, what does it do?

Answer 15

(Surge line isolating valve)
Isolates the pressuriser from the primary circuit in event of a pressure leak when the valve is shut, provided pressuriser pressure is greater than RPV pressure

Question 16

What order do the primary relief valves reset

Answer 16

Steam steam
Low high
High low

Question 17

What is the function of the coolant treatment system

Answer 17

Is provided to remove soluble and suspended radioactive corrosion and fission products from the primary coolant during reactor operation, whilst assisting to maintain the pH. Actively is maintained at a level which permits personnel to enter the RC approximately 15 minutes after shut down

Question 18

Coolant treatment system- where does the HP discharge go

Answer 18

Discharge to the MUD vessel
Overboard via D406

Question 19

What are the three sub sections of the coolant make up system

Answer 19

Recirculating system (normal)
Back up system (de-ox/demin system)
Emergency system

Question 20

Components of the primary shield system

Answer 20

A steel tank surrounding the reactor pressure vessels, which consists of
RCFW cooling coils
Neutral detectors
Core cather
Test source track
A shield water head tank with interconnecting piping and valves

Question 21

Two methods of using the HPDHR system

Answer 21

Forced high pressure decay heat removal (FHPDHR)
Natural high pressure decay heat removal (NHPDHR)

Question 22

What is the system code for the coolant treatment system

Answer 22

System code W