NSRP

Question 1

Function of the NSRP

Answer 1

1. Produce steam from nuclear fission
2. Provide steam to the steam turbines for propulsion
3. Provide steam to the TG’s to produce electricity

Question 2

List the major components of the NSRP

Answer 2

1. PWR
2. Control rods
3. Primary rods
4. MIV’s (main isolating valves)
5. MCP’s (main coolant pumps)
6. Pressuriser
7. Steam generator
8. MUD vessel
9. HPDHR tank
10. Main feed system
11. Main steam system

Question 3

State the operation of the NSRP (primary loop)

Answer 3

1. Uranium fuel is engaged in nuclear fission which produces heat energy
2. Water is heated in the primary circuit via thermal conduction
3. Hot primary coolant is pumped into the SG
4. Hot water flows through hundreds of tubes within the SG, this heat is then transferred to feed water in the SG
5. The primary coolant is then pumped to the reactor to be re-heated, thus cooling the core
6. The cycle repeats

Question 4

List reactor scram examples

Answer 4

1. Loss of heat sink
2. Unidentified steam leaks
3. Loss of reactor control
4. Primary coolant leak
5. Parameters being exceeded

Question 5

State the operation of the NSRP (Secondary loop)

Answer 5

1. Feed water evaporates in the SG creating pressurised steam
2. Steam is forced into the main engines and TG’s via the main steam system pipework
3. The steam rotates the turbines in the main engine and TG’s producing propulsion and electricity
4. Waste steam is condensed in the condensers and converted back into feed water
5. Feed water is pumped back into the SG’s
6. The cycle repeats

Question 6

What does self sustaining mean?

Answer 6

When the TG’s provide power to the boat without SS

Question 7

What is the safety group?

Answer 7

The control rod group which has the biggest effect on criticality