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Sec M Flashcards

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1
Q

What is the function of SG

A

To convert heat produced by the reactor in to steam.
used for ships propulsion, electrical power and auxiliary services

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2
Q

State 3 reason for blowing down SG

A

EOP actions (steam leak)
Reduce chloride concentration
Establish an SG level prior to flash up
To remove crud

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3
Q

Describe Nitrogen purging and sparging

A

sparging uses nitrogen to blow bubbles through the SG in order to mix up the chemicals inside and prevent settling

blanketing is using nitrogen to blanketing top of the SG to prevent oxygen from causing corrasion

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4
Q

State the pressure at which the SG reliefs lift and where do they relieve to?

A

MS 421(422) at 69 Bar
MS425(MS 426) at 73 Bar

discharges to O Comps or RC Bilge

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5
Q

State the Main Functions of the Main Steam system?

A

To supply Dry saturated steam from the SG to:

ME
TG
Aux steam
Main condensers for steam dumping

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6
Q

List the Secondary Functions of the Main Steam system?

A

protect the SG from over pressurisation
Allow blowing down SG
Allow sampling of SG water
Allow draining of the SG
Allow Nitrogen sparging for the SG
Provides nitrogen-blanketing for SG

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7
Q

State the interlocks for opening the Main Turbines Emergency Trip Valve (MTETV)

A

Ahead and Astern throttles valves shut
EPM clutch disengaged selected out
turning-gear disengaged
vacuum above 0.34 bar or override
LPS trip reset of O/R selected

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8
Q

State the trips for (MTETV) that will automatically shut

A

Main turbine over speed
LPS initiation
Operation of the shut button on the RP
Operation of low vacuum trip lever on SPC
vacuum pressure falls below 0.34

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9
Q

functions of Main Feed system

A

To supply
Cooling water to Air Ejectors & gland vapour condensers, steam dump spray during steam dump.
Feed water to accommodate SG level changes.
Maintain SG reference Legs
Monitor and maintain FW Quality and maintain chemistry
Extrach Decay Heat from the reactor while shitdown
Inject feed into the primary circuit in LOC
Maintain Hotwell levels

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10
Q

In what position does the aux steam reducer fail

A

It fails open, to maintain condenser vacuum

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11
Q

Function and operation of the air ejectors and gland steam condensers

A

They remove vapour from the condenser using nozzles to act as venturi, the vapour is then cooled using a feed water cooler, remaining vapour is removed in the second stage. any un-condensable gasses remaining are vented to the atmosphere in front of ATU 12 and 13

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12
Q

state the action to be take when the gland steam receiver loses:
- Automatic control
-Electrical failure

A

Automatic control-
Set AUTO/MANUAL/HAND control switch to Manual a control steam pressure in the receiver using the OPEN/SHUT button.
Electrical failure-
set AUTO/MANUAL/LOCAL control switch to Local clutch in hand wheel, then manually adjust steam pressure.

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13
Q

function of the Gland steam and EVAC system

A

To supply LP steam to and also evacuate from:
Main turbine glands
TG glands
Main turbine throttle valve glands
TG combined stop and emergency valve
TG nozzle control valve glands

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14
Q

Describe how the simplicity ball float trap operates

A

These valves use a reservoir where condensate enters high on one side, building up in the valve before lifting the ball float and allowing some of the condensate to drain away

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15
Q

State the function of the steam drains system

A

To drain condensate from:
MS System (HP)
TG CSEV (HP)
Main turbine interstates
Main turbine control valves
Gland steam supply and evacuation system
Air ejector and glands condenser

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16
Q

What pressure is the steam drains manifolds maintained at and why?

A

3.5bar
To limit the extend at which flash off occurs downstream of the HP drains collectors, this is before the drains enter the condenser.

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17
Q

list the main feed pump trip pressure.

A

Low suction trip at 0.15 bar
Low discharge pressure warning set at 35 Bar

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18
Q

state the electrical supplies for the main feed and extraction pumps.

A

feed Pps:
No1-E1
No2-E2
No3-E4
No4-E4 3 and 4 are cross connected
Ext Pps
No1- NE11
No2-NE10
No3-NE8
No4-NE7
3 and 4 are cross connected

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19
Q

List the function of the main feed system

A

To supply
Cooling water to air ejectors and glands vapour.
To maintain Hotwells levels
Inject feed into the primary circuit in LOC Accident
Extract decay heat from reactor when shut down
Maintain SG reference legs
Maintain FW quality and Maintain Chemistry

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20
Q

What is the function of the small-bore bleed valve fitted in parallel with the feed regulation valve?

A

To reduce thermal fatigue of the SG feed nozzle caused by temperature transients.

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21
Q

List ten systems which utilise water from the RFTS

A

1.Main feed system
2.Ion exchange column
3.ECCS
4.Coolant Make Up
5.RCFW cooling system
6.Primary shield water system
7.VOGs system
8.Coolant sampling system in RC
9.Ships fresh water cooling system in RSC
10.Coolant discharge system

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22
Q

List the 3 main functions of the Feed Transfer system

A

Fill made water from SS
Transfer water from Made/RFT to any RFT
Receive water from the RO plants

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23
Q

Describe the operation of the feed transfer system during emergency HPMU

Study These Flashcards
A

Feed water is supplied to the coolant make-up system (HPMU) to counter a primary circuit leak, RPV pressure will fall and Leak Protection System(LPS) will be tripped
ECCS Phase 1 is armed, if the pressure continues to fall ECCS injection commences

24
Q

Electrical supplies for the Lub Oil pumps and locations

Study These Flashcards
A

AC 440V 60 HZ 3 phase
DC 170-350V (Supply to inverters)
No.1&2 Lc E3 & E4

25
Running temps and pressure for Lub Oil pumps
Oil Temp: 40-50 c Oil Pressure: 3.5Bar
26
list all the supplied by the lub oil system
ME TG EPS GEARBOX Circ Pp Thrust blocks and jacking oil supply Main turbine and EPM clutch controls
27
Explain Bernoulli's theorem for nozzles
for gas passing through a nozzle, total energy remains constant: input pressure + input KE = output pressure + output KE
28
Requirement of a nozzle in a turbine
Must be Large enough to accommodate the steam flow Must expand the steam efficiently and smoothly, IE no turbulence able to direct the steam at required angle towards turbine blades
29
List 3 losses that occur to reduce turbine efficiency
Nozzle losses- caused by manufacturing inaccuracies resulting in friction Blade losses- caused by friction across blade surfaces and by leakage due to clearances Exit losses- kinetic energy remaining in the steam as it exits the turbine stage
30
Sate the function of the ME
To convert the energy of the steam into a motive force for propulsion operable both normally in DMED or SMED in emergency
31
state the trips and interlocks for MS201/202
Trips: Overspeed at 5400rpm vacuum falls below 0.34 bar Condenser pressure rises to 0,25 bar Any SCRAM breakers Interlocks: throttles Vvs are shut with no power from PMS EPS Clutch is out Turning gear is out All trips cleared or overridden
32
function of condenser is to ?
Condense the combined full power exhaust steam from the ME and TG Condense the dump steam flow equivalent to the consumption of a ME at full power
33
State the function if TG
Is to drive the directly coupled generator at a nominal speed of 3600rpm to produce AC
34
State the purpose of the TGCO Accumulator
To maintain oil pressure during pump changeover. non return Vv is provided in the pump discharge line to prevent back flow while the pressure at the accumulator is higher than the pump discharge pressure
35
State the function TGCO
Is to maintain the speed of the turbine at 3600RPM regardless of generator load
36
List ten reason why TG CSEV tripping shut
AVR fault Low condenser vacuum TGCO system pressure low Low TGCO tank level Low bearing LO pressure RFD short circuit System low voltage Loss of 24vDC System overcurrent Remote shutdown from the CCC/SPC
37
What type of hull Vv are fitted to main cric, and where are these operated from
butterfly and ball Vvs All operated from CCC, SCC
38
Briefly describe normal operation of the Cric system and explain Scoop effect
Normally the MCW pumps are run either slow or fast speed depending requirement. however when the ahead speed is sufficient and the pumps are running slow speed speed they can be electrically off loaded MCW inlets located on the leading edge of the after hydroplane and induced flow rate its produced proportional to the submarine ahead speed
39
What are the Cric water pumps electrical supplies
STDB (S) - E3 PORT(S) - E4 STDB (F) - NE8 PORT (F) - NE11
40
State the precaution to be taken when clear sea water and Cric water system is shut down for extended periods
When shut down for periods exceeding 2 weeks they are to be drained, filled with fresh water and vented. The period between draining and filling should be kept to a minimum to avoid MCW pump shaft seal drying out. the shaft seals are to be flushed with fresh water in Harbour - weekly in dry dock - daily
41
State the purpose of the Cric water system
Supply seawater to To each main condenser, so maintaining condenser vacuum at all the main turbine power. TG load and steam dumping conditions up to 100% reactor power. To both the min shaft seals To the thrust compensators To the main Cric water pump seals and bearings To the fwd stern tube bearing
42
State the difference between in harbour and dry dock reference flushing the systems
In harbour - weekly in dry dock - daily
43
State the function of the Clean sea water system
To provide clean seawater to: Both main Cric water pumps Main shaft mechanical seals Forward stern tube bearing
44
what are the electrical supplies for the clean sea water pumps
The unit is 440v 60HZ 3 phase and has normal and an alternate essential electrical supply
45
List the main components of an R.O plant
Pre-filter and supply pipework seawater feed pump bag filter cartridge filter 1st stage HP pump 1st stage DT unit 2nd stage 3rd stage - deioniser return concentrate pipework
46
State the fuction of the chilled water plants
To provide the colling medium for the chilled water system. There are 3/2 CW plants fitted with a cooling capacity of each plant is 675kW, when cooling 1375 litres/ min of chilled water from 13.5 and 6.5 degrees
47
describe precautions associated with chilled water system
The system is to be vented daily, and vented when flow is restored if loss of flow has exceeded ten minutes. the isolation valve on the expansion tank line AC 260 must be shut during system operation. when the system is shutdown AC 260 and AC 261 must be opened to accommodate water expansion.
48
State the function and principles of the AW system and list the main components
the system removes hear from plant and machinery in the engine room and DG room and transfers this heat to the sea. Fresh water Pps Supply manifold return manifold Distribution pipework Hydraulically operated butterfly Vvs Expansion/ header tank
49
State 8 items supplied by AW
TG air cooler TG control oil coolers Hp air compressor coolers LP bilge Pps MSC Chilled water plant RCFW HP air compressor SFWC Pp motor cooling
50
State electrical supplies for the AW pumps
440v 60Hz 3 Phase STBD (S) E3 11 PORT (S) -E4 10 STBD (F) - NE7 3 PORT (F) - NE8 9
51
On loss of hydraulics how are AW hull valves moved
SWS Ball and Butterfly Hull Valves will fail: AS IS on loss of mail hydraulic pressure will fail shut on loss of 24V DC In the event of hydraulic power failure, hydraulic accumulators will enable two complete cycles of valve operation of all valves served by that accumulator.
52
Function of the SPM
Provides an alternative mean of propulsion independent of the Primary and EPM Enhance manoeuvrability when used with the primary of emergency system. can be deployed/ retracted without damage at boat speed up to 12 knots when dived or surfaced
53
functions of the Diesels
Support electrical services Charge the main battery Provide power to the EPM Provide electrical power to MSC Facilitate start up independent of SS
54
Auto shutdown parameters ref Diesels
Lub oil pressure 4br FW diesel outlet temp 90 DG overspeed 2050 rpm DG underspeed 1500 rpm Low Ambient Pressure in DG 750mBa Fuel Iso Vvs: Trip Generators
55
functions of the snort induction
To draw air external to the submarine for running the DG when on the surface or snorting at PD
56
Functions of Diesel fuel system
To transport fuel from storage tanks to the diesel engines, filter and clean the fuel and deliver it at 1bar to the DG fuel Pps The system is also required to measure the amount of diesel fuel consumed by the diesel engines
57
Function of the Diesel Air start Inc Pressure used
Is to provide compressed air in sufficient quantity and pressure to: Turn the dg over as part of the dewatering sequence Pressure 28 bar from AV&B

baking (2 decks)

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