Revision sheet Flashcards
What is the function of the health physics organisation onboard and how is this achieved?
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
What are 5 different types of radiation
- Alpha
- Beta
- Neutrons
- Gamma
- X-rays
What does ALARP stand for?
As low as reasonably practicable
What are the 3 principles that are employed to achieve ALARP?
- Time
- Distance
- Shielding
What are the 3 objectives that are also employed to maintain ALARP?
- Justify
- Optimise
- Limit
State 2 types of radiological surveys that are carried out and what they mean
Routine:
- Carried out around RC bulkheads at regular intervals.
- Ensures that primary and secondary shielding are intact
Emergency:
- Conducted after any collision/action damage
List the types of personal dosimetry used onboard
- TLD
- PED
- Records
List 8 precautions for entering the RC
- Reactor shut down
- Vent state red carried out
- Entry controlled
- EOOD/W permission obtained
- Protective clothing is to be worn at all times
- TLD and PED is to be worn at all times
- Brief given by tunnel monitor who will highlight high dose areas
- Eating and drinking prohibited
- Cuts are to be checked by the monitor and covered with a dressing
How many APD’s are fitted on board and where are they located?
- fwd in the DC equipment space
- aft in man room
- aft escape platform
How many reactor accident boxes are on board and where are they fitted?
- 1 deck WT flat by the fwd LET
- aft escape platform stbd side
List the 5 contents of the reactor accident box
- ADM 300
- PD12i
- Potassium iodide tablets
- Mechanical kill cards
- Reactor event instructions
List 2 fixed onboard radiation monitoring equipment
- Gamma alarm
- Radiac system
List 5 hand held onboard monitoring equipments
- ADM 300 V1A
- MK 32 NRM
- BSP 100
- XP 100
- Alpha probe
State the 6 pieces of equipment used for atmosphere monitoring?
- CAMS
- Drager tubes and pumps
- H2 contents meter
- MSA
- Analox
- Infraran
State the 5 members of the onboard health physics organisation
- XO
- Medical officer
- POMA
- LMA
- MA
State the 7 consoles and panels that make up man room
- MCD
- RSP
- PSP
- ESP
- ENV panel
- NWOOW and EOOW Comms consoles
- Minerva fire detection unit
What is the manning requirement when the reactor is critical?
- Manoeuvering room manned 24/7 365
- Manned by qualified watch keepers
What is the manning requirement when the reactor is shutdown alongside?
- Manned by shutdown supervisor
- Manned by shutdown watchkeeper
What is the function of the NSRP?
- To engage uranium 235 in nuclear fission and produce steam
- Produce steam for the main engines for propulsion
- Produce steam for the TG’S for production of electricity
What is meant by self sustaining?
When the TG’s are producing electricity for the SM without the use of ss
How can the reactor be shutdown in an emergency
Full scram
What is meant by the term full scram?
All 4 control rod groups are dropped into the core this stops fission completely
What is meant by the term partial scram?
1 control rod group is dropped into the core, this stops the fission process for a limited period of time.
List 5 causes of reactor scram
- Loss of heatsink
- Unidentified steam leak
- Loss of reactor control
- Primary coolant leak
- Parameters being exceeded
What is the function of the containment system?
`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
Explain the 3 containment boundaries
Primary - RC bulkheads and the surrounding pressure hull
intermediate - Airlocks, tunnel and pressure hull
Secondary - The whole submarine
What is the CAIS system?
A system to automatically operate containment valves in the event of a hard or soft system leak.
Where can containment be initiated from?
Manually via a switch on the environmental panel
List 6 systems that are fitted with automatic valves
- LP bilge system (BS)
- Trim system (WS)
- Ventilation system (SBV)
- SG reliefs (MS)
- Chilled water system (AC)
- SG water sampling (MS)
- Atmosphere analysing (SA)
- Steam drains (SD)
- Air particle detector (SA)
- Tunnel pressure equalising (LPA)
11, Medium pressure air (MPA) - Feed transfer system (FT)
- Ballast system (WS)
- Aft AFFF system
Describe plant state A
Plant pressure greater than 35 bar
or
plant temperature greater than 93 degrees c
or
More than one CRDM energised
Describe plant state B
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
Describe plant state C
- The plant is shut down
- Plant pressure less than 35 bar
- Plant and pressuriser temperature are less than 93 degrees c
- All CRDM’s de-energised and fuses removed
- Two independent means of decay heat removal
- The decay heat rate is less than heat removal capacity of the decay heat removal system
- Plant pressure not being maintained by a steam bubble
