Term
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Definition
[image]The RCS transports the thermal energy produced in the core to the S/G’s.
[image]The RCS consists of 4 parallel heat transfer loops connected to the reactor vessel.
[image]Each loop has a S/G and RCP and 1 loop (13,23) connects to the bottom of the PZR (surge line).
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Term
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Definition
[image]Acts as the 2nd fission product boundary in the case of a postulated loss of coolant accident.
[image]The 1st fission product barrier is the fuel cladding.
[image]The 3rd fission product barrier is the Containment.
[image]Transfers heat from the reactor core/RCS to the RHR system during plant cool down.
[image]Facilitates the venting of gases through the Rx vessel head vent system and the PZR PORV’s to the PRT to ensure natural circ core cooling can be performed during post accident conditions.
[image]Serves as the neutron moderator and also provides a medium for reactivity control using a soluble neutron absorber/poison (BA).
[image]Accommodates thermal transients to the extent necessary via RCS heat capacity to allow stable control system op without actuation of the RPS during system transients.
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Term
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Definition
Plant design life - 40 years
Design Pressure - 2485 psig
Design Temp - 650°F
NOP - 2235 psig
RC temp @ 100% power Inlet - 545°F Outlet - 610°F
Total volume including PZR - 12,612ft3
Total heat output @ 100% - 3423 MWt
Total coolant flow rate - 132.2 x 106lbm/hr |
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Term
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Definition
Steam Generators
Reactor Coolant Pumps
Pressurizer
RCS Over pressurization Devices
Reactor Coolant loop Piping |
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Term
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Definition
Provide an interface between the MS and RCS systems.
Heat is transferred into the feed water to produce high quality steam.
Primary side: Divided head whose inner surfaces are clad w/ austenitic stainless steel.
Secondary side: A shell surrounding the tubes and stm space.
Moisture separators – carbon steel. |
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Term
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Definition
Provide forced flow to transfer coolant from the reactor vessel to the S/G’s.
Design flow is sufficient to meet all heat removal and power generation requirements.
During startup, the hydraulic energy conveyed to the coolant from the RCP’s used to heat up the RCS from cold shutdown to hot standby.
Maintain chemical homogeneity of the coolant during chemical adjustments.
Provide the normal source of driving head to operate PZR spray.
Provide adequate circ to provide uniform cool down of the RCS during cool down and shutdown. |
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Term
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Definition
Controls RCS pressure.
Provides a surge space to accommodate RCS volume changes during plant transients.
Spray lines - 21/11 & 23/13 cold legs.
Spray lines combine spray ñnozzle at the top of the PZR.
Either 21/11 or 23/13 RCP must be running to provide the normal source of driving head for PZR spray. 23/13 is preferred, due to better spray performance.
A surge line connects the bottom of the PZR to the rest of the RCS via the hot leg of 23/13 loop. |
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Term
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Definition
PZR = saturation temp & press.
RCS = at a lower temp ñ sub cooled.
Pressure is controlled by heaters or spray.
PZR spray scoop converts velocity to pressure head. |
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Term
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Definition
Prevents RCS from exceeding 110% design pressure.
Discharge to the PRT.
3 Valves
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Term
Power Operated Relief Valves
PORVs |
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Definition
Prevents RCS pressure from exceeding the high pressure Rx trip set point for all loss of load transients up to 50% of total load.
Assumes steam dumps & rod control are functional.
Provides cold over-pressure protection at low RCS temp’s – POPS.
2 Valves |
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Term
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Definition
TH NR – 3 taps
TCNR – 1 tap
TH WR – 1 tap
TCWR – 1 tap
RCS Flow – 4 taps on the Intermediate leg
1 high pressure and 3 low pressure
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Term
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Definition
Penetrations common to all legs
BIT on the Cold leg – high head injection.
Accumulator/SI/RHR to each Cold leg.
SI to each Hot leg for hot leg recirc. 3 & 4 loops combine with RHR discharge. 1 loop combined with RHR suction.
RCDT – Intermediate leg (4 loop is off the letdown line). |
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Term
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Definition
Ø21Loop
ØRHR suction – Hot leg
ØRVLIS – Hot leg
ØSample – Hot leg
ØPZR spray – Cold leg
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Term
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Definition
Ø23 Loop
ØRHR discharge – Hot leg
ØSample – Hot leg
ØPZR surge – Hot leg
ØPZR spray – Cold leg
ØExcess letdown – Cold leg
ØNormal charging – Cold leg
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Term
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Definition
Ø24 Loop
ØRHR discharge – Hot leg
ØRVLIS – Hot leg
ØAlt Charging – Cold leg
ØNormal letdown – Intermediate leg |
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Term
| Connections Below Horizontal Centerline |
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Definition
ØRHR suction line
ØLoop drain to RCDT including Normal letdown
ØSample line
Ø2 of 3 TH NR
ØRVLIS
ØFlow taps (all taps) |
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Term
| Penetrations > than Centerline |
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Definition
At or above center line
PZR surge line
Excess letdown
SI/RHR hot leg injection except 21/11 (RHR suction is off 21/11)
At the top of the piping
TH and TC WR
TC NR
1 of the TH NR taps
Accumulator tap
PZR spray
Charging – normal and alternate |
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