Revision sheet

Question 1

What is the function of the health physics organisation onboard and how is this achieved?

Answer 1

Routinely monitor radiological and atmospheric conditions on board.

Achieved by:
1. Issue personal dosimetry and maintain individual reports
2. Atmosphere and environmental monitoring
3. Radiochemistry
4. Radiation and contamination monitoring

Question 2

What are 5 different types of radiation

Answer 2

1. Alpha
2. Beta
3. Neutrons
4. Gamma
5. X-rays

Question 3

What does ALARP stand for?

Answer 3

As low as reasonably practicable

Question 4

What are the 3 principles that are employed to achieve ALARP?

Answer 4

1. Time
2. Distance
3. Shielding

Question 5

What are the 3 objectives that are also employed to maintain ALARP?

Answer 5

1. Justify
2. Optimise
3. Limit

Question 6

State 2 types of radiological surveys that are carried out and what they mean

Answer 6

Routine:
- Carried out around RC bulkheads at regular intervals.
- Ensures that primary and secondary shielding are intact

Emergency:
- Conducted after any collision/action damage

Question 7

List the types of personal dosimetry used onboard

Answer 7

1. TLD
2. PED
3. Records

Question 8

List 8 precautions for entering the RC

Answer 8

1. Reactor shut down
2. Vent state red carried out
3. Entry controlled
4. EOOD/W permission obtained
5. Protective clothing is to be worn at all times
6. TLD and PED is to be worn at all times
7. Brief given by tunnel monitor who will highlight high dose areas
8. Eating and drinking prohibited
9. Cuts are to be checked by the monitor and covered with a dressing

Question 9

How many APD’s are fitted on board and where are they located?

Answer 9

1. fwd in the DC equipment space
2. aft in man room
3. aft escape platform

Question 10

How many reactor accident boxes are on board and where are they fitted?

Answer 10

• 1 deck WT flat by the fwd LET
• aft escape platform stbd side

Question 11

List the 5 contents of the reactor accident box

Answer 11

1. ADM 300
2. PD12i
3. Potassium iodide tablets
4. Mechanical kill cards
5. Reactor event instructions

Question 12

List 2 fixed onboard radiation monitoring equipment

Answer 12

1. Gamma alarm
2. Radiac system

Question 13

List 5 hand held onboard monitoring equipments

Answer 13

1. ADM 300 V1A
2. MK 32 NRM
3. BSP 100
4. XP 100
5. Alpha probe

Question 14

State the 6 pieces of equipment used for atmosphere monitoring?

Answer 14

1. CAMS
2. Drager tubes and pumps
3. H2 contents meter
4. MSA
5. Analox
6. Infraran

Question 15

State the 5 members of the onboard health physics organisation

Answer 15

1. XO
2. Medical officer
3. POMA
4. LMA
5. MA

Question 16

State the 7 consoles and panels that make up man room

Answer 16

1. MCD
2. RSP
3. PSP
4. ESP
5. ENV panel
6. NWOOW and EOOW Comms consoles
7. Minerva fire detection unit

Question 17

What is the manning requirement when the reactor is critical?

Answer 17

1. Manoeuvering room manned 24/7 365
2. Manned by qualified watch keepers

Question 18

What is the manning requirement when the reactor is shutdown alongside?

Answer 18

1. Manned by shutdown supervisor
2. Manned by shutdown watchkeeper

Question 19

What is the function of the NSRP?

Answer 19

1. To engage uranium 235 in nuclear fission and produce steam
2. Produce steam for the main engines for propulsion
3. Produce steam for the TG’S for production of electricity

Question 20

What is meant by self sustaining?

Answer 20

When the TG’s are producing electricity for the SM without the use of ss

Question 21

How can the reactor be shutdown in an emergency

Answer 21

Full scram

Question 22

What is meant by the term full scram?

Answer 22

All 4 control rod groups are dropped into the core this stops fission completely

Question 23

What is meant by the term partial scram?

Answer 23

1 control rod group is dropped into the core, this stops the fission process for a limited period of time.

Question 24

List 5 causes of reactor scram

Answer 24

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

Question 25

What is the function of the containment system?

Answer 25

`1. To prevent the release of fission products from the rc and the submarines pressure hull 2. To protect the general public from the effects of a reactor event

Question 26

Explain the 3 containment boundaries

Answer 26

Primary - RC bulkheads and the surrounding pressure hull intermediate - Airlocks, tunnel and pressure hull Secondary - The whole submarine

Question 27

What is the CAIS system?

Answer 27

A system to automatically operate containment valves in the event of a hard or soft system leak.

Question 28

Where can containment be initiated from?

Answer 28

Manually via a switch on the environmental panel

Question 29

List 6 systems that are fitted with automatic valves

Answer 29

1. LP bilge system (BS) 2. Trim system (WS) 3. Ventilation system (SBV) 4. SG reliefs (MS) 5. Chilled water system (AC) 6. SG water sampling (MS) 7. Atmosphere analysing (SA) 8. Steam drains (SD) 9. Air particle detector (SA) 10. Tunnel pressure equalising (LPA) 11, Medium pressure air (MPA) 12. Feed transfer system (FT) 13. Ballast system (WS) 14. Aft AFFF system

Question 30

Describe plant state A

Answer 30

Plant pressure greater than 35 bar or plant temperature greater than 93 degrees c or More than one CRDM energised

Question 31

Describe plant state B

Answer 31

The reactor is shutdown and Plant pressure is less than 35 bar and Plant pressure is less than 93 degrees c and Not more than one CRDM energised

Question 32

Describe plant state C

Answer 32

1. The plant is shut down 2. Plant pressure less than 35 bar 3. Plant and pressuriser temperature are less than 93 degrees c 4. All CRDM's de-energised and fuses removed 5. Two independent means of decay heat removal 6. The decay heat rate is less than heat removal capacity of the decay heat removal system 7. Plant pressure not being maintained by a steam bubble