Nuclear system
1. What is the purpose of moderator D2O?
The purposes of moderator D2O are,
a. To thermalise neutrons to maintain criticality.
b. Emergency core cooling when PHT fails.
c. Structural cooling.
2. What is the cooling water used in moderator heat exchanger during normal
operation? And during class IV failure?
During normal operation process LP water is used in moderator heat exchangers,
which transfers heat to seawater. During class IV failure firewater is used for the
moderator heat exchanger.
3. During loca how the cooling of fuel bundle is achieved?
During loca there is provision for taking D2O from the moderator system, which is
connected to PHT system for fuel cooling and there is one more option for the
cooling of the fuel from the fire water system.
4. How coolant flow is maintained in the event of loss of power to the PHT system?
When the PHT power fails, it takes two minutes for DG to come to full power. The
circulation is maintained by flywheel, which increases the de-acceleration and
maintains the flow for two minutes.
If there is a station blackout the flow is maintained by thermo-symphoning by which
more denser cold water comes down and less denser hot water goes up by convection
method.
5. What are the materials in contact with PHT system?
Piping – carbon steel.
Pressure tubes – zircalloy-2
Fuel cladding – zircalloy-2
End shield – stainless steel. Etc.
6. What are the main futures of PHT system?
a. Impeller – To reduce the water flow.
b. Self-injection Hx – Cools the water in case of leakage.
c. Gland supply – Cools the seals.
d. Primary and secondary seals – sealing the pump.
e. Thrust bearing – To take the axial thrust.
7. What are the purposes of bleed condenser?
The purposes of bleed condenser are,
a. To cool the bleed water, which goes to bleed cooler.
b. To provide cool hot water to the PHT purification system.
8. What is header level control?
For the purpose of maintenance of PHT pipe valves, boiler inlet valve the level of the
coolant should be below the valve to prevent the coolant coming out of the system.
This is called the header level control and achieved by means of manual operation of
valves and shutdown cooling pump.
9. In MAPS Unit # 1 end-shield cooling system has got heaters. Why?
Unit # 1 end-shield is made of nickel steel, which had a nil ductility temperature of
-100°C while commissioning. After 30 years of operation this will rise to +32°C,
because of radiation exposure. To avoid the failure of end shield of MAPS Unit # 1
the temperature of the end-shield should be maintained at 68°C always. MAPS 1
end-shield cooling system is operating at elevated temperature. But in MAPS Unit #2
this problem is not existed because in this unit end-shields are made up of stainless
steel.
https://www.youtube.com/channel/UC4_D50vMu1wbQrPaLFYo6Eg https://www.youtube.com/channel/UC4_D50vMu1wbQrPaLFYo6Eg RRB JE, SSC AE/JE UPSSSC JE, SSC JE, CIVIL ENGINEERING MCQs, ELECTICAL ENGINEERING MCQs, preavious year quesion papers, dmrc, lmrc, drdo,rrb ntpc, ntpc, pgcil, dsssb, states board, GATE IES EE, ESE, ECE, ME, CE, IT & CS EXAM MATERIALS & OLD PAPERS Electrical Engineering https://t.me/pravendrarajpoot Daily news & current affairs in hindi & english fully updated Daily current affairs https://t.me/newsdailypkr Engineering Discussion group for your upcoming exams, you can ask your any query regarding your problem,๐๐๐ https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA PKR ELECTRICAL ENGINEERING I am sure this is the best place for you guys subscribe and get success IF YOU WANT TO JOIN ME ON TELEGRAM FOR PDF @newsdailypkr AE/JE EE, ESE, ECE, ME, CE, IT & CS EXAM MATERIALS & OLD PAPERS Electrical Engineering https://t.me/pravendrarajpoot facebook page:- Pravendra Kumar Rajpoot https://t.me/newsdailypkr https://chat.whatsapp.com/5AS7dNFTP4H4vVsiWsqHrT https://t.me/srk50 https://t.me/pravendrarajpoot https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA https://t.me/pravendrarajpoot Daily news & current affairs in hindi & english fully updated Daily current affairs https://t.me/newsdailypkr Engineering Discussion group for your upcoming exams, you can ask your any query regarding your problem,๐๐๐ https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA PKR ELECTRICAL ENGINEERING I am sure this is the best place for you guys subscribe and get success IF YOU WANT TO JOIN ME ON TELEGRAM FOR PDF @newsdailypkr AE/JE EE, ESE, ECE, ME, CE, IT & CS EXAM MATERIALS & OLD PAPERS Electrical Engineering https://t.me/pravendrarajpoot facebook page:- Pravendra Kumar Rajpoot https://t.me/newsdailypkr https://chat.whatsapp.com/5AS7dNFTP4H4vVsiWsqHrT https://t.me/srk50 https://t.me/pravendrarajpoot https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA
1. What is the purpose of moderator D2O?
The purposes of moderator D2O are,
a. To thermalise neutrons to maintain criticality.
b. Emergency core cooling when PHT fails.
c. Structural cooling.
2. What is the cooling water used in moderator heat exchanger during normal
operation? And during class IV failure?
During normal operation process LP water is used in moderator heat exchangers,
which transfers heat to seawater. During class IV failure firewater is used for the
moderator heat exchanger.
3. During loca how the cooling of fuel bundle is achieved?
During loca there is provision for taking D2O from the moderator system, which is
connected to PHT system for fuel cooling and there is one more option for the
cooling of the fuel from the fire water system.
When the PHT power fails, it takes two minutes for DG to come to full power. The
circulation is maintained by flywheel, which increases the de-acceleration and
maintains the flow for two minutes.
If there is a station blackout the flow is maintained by thermo-symphoning by which
more denser cold water comes down and less denser hot water goes up by convection
method.
5. What are the materials in contact with PHT system?
Piping – carbon steel.
Pressure tubes – zircalloy-2
Fuel cladding – zircalloy-2
End shield – stainless steel. Etc.
6. What are the main futures of PHT system?
a. Impeller – To reduce the water flow.
b. Self-injection Hx – Cools the water in case of leakage.
c. Gland supply – Cools the seals.
d. Primary and secondary seals – sealing the pump.
e. Thrust bearing – To take the axial thrust.
7. What are the purposes of bleed condenser?
The purposes of bleed condenser are,
a. To cool the bleed water, which goes to bleed cooler.
b. To provide cool hot water to the PHT purification system.
8. What is header level control?
For the purpose of maintenance of PHT pipe valves, boiler inlet valve the level of the
coolant should be below the valve to prevent the coolant coming out of the system.
This is called the header level control and achieved by means of manual operation of
valves and shutdown cooling pump.
9. In MAPS Unit # 1 end-shield cooling system has got heaters. Why?
Unit # 1 end-shield is made of nickel steel, which had a nil ductility temperature of
-100°C while commissioning. After 30 years of operation this will rise to +32°C,
because of radiation exposure. To avoid the failure of end shield of MAPS Unit # 1
the temperature of the end-shield should be maintained at 68°C always. MAPS 1
end-shield cooling system is operating at elevated temperature. But in MAPS Unit #2
this problem is not existed because in this unit end-shields are made up of stainless
steel.
https://www.youtube.com/channel/UC4_D50vMu1wbQrPaLFYo6Eg https://www.youtube.com/channel/UC4_D50vMu1wbQrPaLFYo6Eg RRB JE, SSC AE/JE UPSSSC JE, SSC JE, CIVIL ENGINEERING MCQs, ELECTICAL ENGINEERING MCQs, preavious year quesion papers, dmrc, lmrc, drdo,rrb ntpc, ntpc, pgcil, dsssb, states board, GATE IES EE, ESE, ECE, ME, CE, IT & CS EXAM MATERIALS & OLD PAPERS Electrical Engineering https://t.me/pravendrarajpoot Daily news & current affairs in hindi & english fully updated Daily current affairs https://t.me/newsdailypkr Engineering Discussion group for your upcoming exams, you can ask your any query regarding your problem,๐๐๐ https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA PKR ELECTRICAL ENGINEERING I am sure this is the best place for you guys subscribe and get success IF YOU WANT TO JOIN ME ON TELEGRAM FOR PDF @newsdailypkr AE/JE EE, ESE, ECE, ME, CE, IT & CS EXAM MATERIALS & OLD PAPERS Electrical Engineering https://t.me/pravendrarajpoot facebook page:- Pravendra Kumar Rajpoot https://t.me/newsdailypkr https://chat.whatsapp.com/5AS7dNFTP4H4vVsiWsqHrT https://t.me/srk50 https://t.me/pravendrarajpoot https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA https://t.me/pravendrarajpoot Daily news & current affairs in hindi & english fully updated Daily current affairs https://t.me/newsdailypkr Engineering Discussion group for your upcoming exams, you can ask your any query regarding your problem,๐๐๐ https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA PKR ELECTRICAL ENGINEERING I am sure this is the best place for you guys subscribe and get success IF YOU WANT TO JOIN ME ON TELEGRAM FOR PDF @newsdailypkr AE/JE EE, ESE, ECE, ME, CE, IT & CS EXAM MATERIALS & OLD PAPERS Electrical Engineering https://t.me/pravendrarajpoot facebook page:- Pravendra Kumar Rajpoot https://t.me/newsdailypkr https://chat.whatsapp.com/5AS7dNFTP4H4vVsiWsqHrT https://t.me/srk50 https://t.me/pravendrarajpoot https://t.me/joinchat/JObxeA7n6S4qvnegrGhTgA
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