3 Advantages of AC motors over DC
- Equipment is smaller for given power outlet
- Less maintenance
- Use of 3 phase provides smooth rotating magnetic field for rotating machinery
Fundamental requirements for L system
- Generate and distribute electrical power from reactor during normal operation
- To maintain electrical power supplies to the essential services when reactor fails
- To provide sufficient power to start up and shutdown reactor
- Provide high integrity supplies for ship control reactor instrumentation and reactor control
- Provide alternative means of propulsion on reactor SCRAM
Two reactor power states and MCP combos
2F/2F - Full Power
2S/2S - Half Power
Major types of Damage NSRP Suffers
- Mechanical
- Chemical
- Thermal
Function of the MSC
Fulfil the requirement for no break supply when reactor fails or shutdown
Max power output for MG’s AC + DC
- 700Kw Dc
- 650Kw Ac
Function of the MG’s
- Generate AC for ships services when both TG’s are unavailable or cold moving
- Generate DC for ships services (Battery Charging)
Provide a changeover between above as needed - Offload shore supply or the TG’s onto the main batteries as required
Precautions before battery entry
- Permission from SCOOW/OOD
- Battery ventilated + ventilation maintained
- All metal objects removed
- Insulated tools
- Overalls and rubber soles worn
- Must be accompanied
Routines carried out 25 week cycle
- Restricted charge as required
- Normal Charge 3 per cycle
- Equalising charge 3 per cycle
- Conditioning Discharge 1 per cycle
- All round readings twice a day
Functions of DG
- Support AC and DC electrical services
- Charge main battery
- Support Missile services
- Provide L power for diesel/L propulsion
- Provide L power for MSC/MG for reactor start up independent of shore supply
Alarms does the Teddington Series 6 have
- Overspeed Tachogenerator
- Overspeed Mechanical
- LO outlet temp
- LO inlet pressure
- Exhaust system 1st and 2nd exhaust
- Manual Trip
Who controls the SS procedure and located ?
Duty engineer from Manoeuvring
Two lineups of the ESS busbar integrity
- Double MG/MSC Standby
- Single MG/ MSC Standby
Functions of Switchgear
- Allow power sources, busbar section + services to be switched in + out as required from central position (Manoeuvring room)
- To open automatically under trip conditions to protect power cables and isolate faults
- To open discriminately under trip conditions, ensuring minimum disruption to electrical services
Steps to open close Breaker with faulty retaining coil
- To close : Obtain permission MEO
- Check that protection and interlock functions normally
- Set retaining coil override to ON
- Make BKR normal way from ESP
- To open : Release retaining coil override
- Set control switch on ESP to off
How is the 24v derived and split?
- Nine transformer rectifier units (4 Fwd, 5 Aft) supplied from 440v 60Hz Ess busbars
Name 5 panels in manoeuvring
- RSP - Reactor Services Panel
- PSP - Propulsion Services Panel
- ESP - Electrical Services Panel
- MCD - Main Control Desk
- EP - Environmental Panel
What does IRMU monitor
- TGs
- MGs
- DGs
- SPM
- DC Busbars
- Shore Supply
Functions of EPM
- Back up or emergency facility to support main propulsion in event of : Failure at sea of NSRP
- Failure of both main engines
- Cold Move
