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Primary Board Study Material
These questions were collected from different study guides. Understand that you may get asked questions that are not on this guide. Please let me know if there are any errors found or if there is anything that should be added.
Terms in this set (77)
ES Channel 1 & 2
RCS pressure1600 psig, RB pressure 3 psig
All HPI pumps start, HP-24,25,26&27 open, RB non-essential isolation
ES Channel 3 & 4
RCS pressure 550 psig, RB pressure 3 psig
A&B LPI pumps start, LP-17&18 open, LPSW pumps start
ES Channel 5 & 6
RB Pressure 3 psig
All RBCU start in Low speed, RB essential isolation, CC-7/8
ES Channel 7 & 8
RB pressure 10 psig
All RBS pumps start, BS-1&2 open
Which LPI pumps are desirable to run for DHR? And Why?
A or B since they restart.
What causes A & B LPI pumps to restart?
Relay logic. Relays tell them to reclose after relays cause them to trip.
What are Time Critical Actions?
Manual actions that must be performed within a relatively short period of time when specific conditions occur. Failure to perform Time Critical Actions within their specified times could lead to core damage for specific plant conditions and events.
What are EDL's and what do they mean to you?
EDL's increase your dose limit to 5 R for emergency actions. If EDL's are implemented, you may continue to work if your dosimeter alarms, but you must continuously monitor your dose.
Plant work 5 R
Protecting equipment 10 R
Saving a life 25 R
What is your responsibility if EDL's are in effect and you are sent to perform a task ?
Continuously monitor your dose as you perform your task.
What events require implementation of EDL's ?
LOCA, SGTR, and loss of SF Pool (AP-35).
What procedure will direct implementing EDL's ?
EOP and AP 35 (Loss of SFC)
What is a 'Hot Spot' ?
An area of radiation that is 5 times the general area and greater than 100 mr/hr on contact.
How is a hot spot marked?
Lime green tag with magenta tri-foil
What does a sign with 'SD 3.2.16' on it mean to you ?
The component should be intact. The component is a passive feature designed to help mitigate a HELB or LOCA.
What is required to breech a SD 3.2.16 related component ?
Specific paperwork per SD 3.2.16 is required to be completed to evaluate the proposed breech
What is the purpose of the LPI system?
Normally the LPI system serves as the DHR system for the core and as part of the ECCS during a LBLOCA
Why does U-3 not have three LPI modes?
The U-3 LPI coolers were built to withstand the combined pressures of the RCS and LPI pump discharge pressures and require no additional DHR modes for RCS heatup or cooldown.
Which LPI pumps are ES pumps and why?
When power was restored, the A or B LPI would start if it was previously operating (its control switch already in 'Run' position). The C LPI pump is not an ES pump and would not start without operator action.
During normal decay heat mode, which LPI pump is the preferred pump to operate and why ?
A or B LPI pump due to fact that either the A or B LPI pump would restart immediately following power restoration if a loss of power had occurred. The C LPI pump would require operator action to restart.
Where does letdown tap off the RCS at ?
The B1 Tc loop on all 3 units.
Describe the interlocks between HP-1/CC-1 and HP-2/CC-2.
CC-1 and HP-1 (CC-2 and HP-2) operate from a single switch. The CC valve will open first then the HP valve will open. The HP valve will close first and then the CC valve will close.
How many letdown coolers are normally in service and why ?
Two. Both coolers are normally in service with 200 gpm CC flow to each cooler (400 gpm total). If only one cooler was in service, a higher flowrate would be necessary through that cooler and flow induced tube vibrations could occur.
Describe the interlock associated with HP-5 ?
At 135 degrees F HP-5 closes.
What is the purpose of HP-5 interlock ?
HP-5 closes on high letdown temperature to protect the demineralizer resins.
At what letdown temperature does the high letdown temperature statalarm come in alarm at ?
130 deg F
What is the normal position (open, closed, throttled) of HP-6, HP-7 and HP-42 at power ?
HP-6 full open, HP-7 throttled to achieve 75 gpm letdown flow, HP-42 closed.
When is HP-42 used and why ?
At low RCS pressures, there is not enough pressure to force adequate letdown flow through the block orifice and HP-42 is utilized to achieve the required flow.
What is normal letdown flowrate ?
Where does HP-14 'bleed' to when in 'bleed' position ?
In 'bleed' HP-14 diverts letdown flow to the A BHUT
Where can the RCS make up from using the normal HP-16 flowpath ?
A BHUT, B BHUT, CBAST
What is normal LDST H2 pressure ?
Approximately 30 to 48 psig
What is the admin limit for low H2 pressure in the LDST ?
What is the purpose of the admin limit on low H2 pressure in the LDST ?
To ensure the LDST remains the suction source for the HPI pumps and not the BWST (if HP-24 or 25 were to leak by)
What are the interlocks associated with low level in the LDST ?
At <40 inches in the LDST, HP-14 returns to 'normal' position if it were in 'bleed' position and HP-24 and 25 open.
What is normal seal injection flow for U-1,2 and 3 ?
U-1 = 32 gpm
U-2&3 = 40 gpm
Describe what affects adjusting a single seal injection needle valve has on total seal injection flow?
It will affect flow to the other three needle valves
What are the normal position of HP-26 and HP-27 at power ?
HP-26 is closed and HP-27 is open
What does HP-120 do ?
Throttles open to maintain Pzr level at setpoint
What setpoint does HP-120 control at ?
Normally, Pzr level setpoint is 220 inches
What operating restrictions are placed on the C HPI pump and why ?
The B HPI train injection nozzles do not have thermal sleeves or warming flows and operation of the C HPI pump induces a thermal cycle in the injection nozzles.
What are the requirements if the C HPI pump has operated in the injection mode ?
Anytime the C HPI pump is operated in the injection mode (HPI flow through the B injection nozzles) a thermal cycle is induced and operation of the C HPI pump must be logged. The B HPI train injection nozzles are limited to 40 thermal cycles.
What is normal RCP seal return flow ?
Approximately 1.5 gpm per RCP (~ 6 gpm total seal return flow)
Why is the seal return cooler rated at 250 gpm ?
Due to the HPI minimum recirc flowing through the seal return coolers
Describe the RCP seal return interlocks ?
RCS Press >400
& Low Seal Supply flow (<22gpm)
& Low CC flow (<575gpm)
All Seal Return Valves close
IF Seal injection to that RCP is low (<4gpm)
& RCP is off OR CC flow low (<575gpm)
Individual Seal Return Valves will close
What two conditions would facilitate using 'piggyback' to allow LPI to supply HPI?
Loss of normal suction source to HPI (HP-24&25 failed closed)
Extended operation of HPI (BWST level low and transfer to RBES is required) during a SBLOCA
What is the concern with too high of an overpressure in the LDST?
H2 could enter the HPI piping and air bind the HPI pumps.
What is the concern with too low of an overpressure in the LDST?
With too low of an overpressure, if all three HPI pumps were started on an ES actuation, the possibility exists to draw a vacuum on the LDST and damage the LDST.
What is the purpose of the CFT's ?
To help reflood the core following the blow down phase of a LBLOCA.
What causes the CFT's to dump into the RCS ?
The CFT's are a passive system and require no power to operate. Normally, the RCS pressure is high enough to maintain the CFT check valve closed. If RCS pressure decreases below 600 psig the N2 overpressure in the CFT's will force the CFT's to dump their contents into the core.
What are the TS limits for the CFT's (level, pressure and boron concentration) ?
Level = 13 feet +/- 0.44 feet
Pressure = 600 +/- 25 psig
Boron = Per the COLR (Normally > 2220 ppm B)
What loads does the CC system supply ?
Letdown coolers, RCP seal coolers, QT coolers, CRDM stators
What happens if CC-8 closes at power ?
Both CC pumps trip, letdown isolates at 135 degrees F, a manual trip of reactor will be required if two CRD stators exceed 180 degrees F
What requirements are there if CC-8 has been manually opened at power ?
If CC-8 has been manually opened, an operator must remain in the area.
What does GWD-1 do ?
GWD-1 operates to maintain the GWD vent header at setpoint. If the vent header is too negative, GWD-1 will open to allow more flow back to the vent header. If the vent header is too positive, GWD-1 will close down and direct more flow to the in service GWD tank.
What is the HP Boric Acid pump used for ?
Make up to the CFT's
How is a plant heat up accomplished on a unit startup?
On a unit startup, LPI is in operation for DHR. LPSW is aligned to LPI coolers to control RCS temperature. SG levels are being maintained at 25" SUR. RCS heat up is accomplished by throttling closed on LPSW-251 & LPSW-252, energizing Pressurizer heaters and throttling closed with the TBV's.
RCS is heated up to <195°F.
Heat removal is transferred from LPI to SG's by closing LPSW-251 and LPSW252 and decreasing LPI flow to 1000 gpm. The 1st RCP is started and the LPI pump is secured. Close LP-1.
To continue the heat up, continue to throttle closed on TBV's and start the additional RCP's.
Describe how Thot and Tcold vary on a unit startup to 100% power.
0 - 19% Full Power
SG Level is maintained constant at 25 inches on startup range.
Power is increased by ramping Tave .
From 0% to ~ 19% power, Tave ramps up from 532°F to 579°F. Thot ramps up to ~582°F and Tcold ramps up to ~575°F
19% - 100%
Tave on primary held constant at 579°F. Thot increases from ~582°F to 602°F, Tcold decreases from 575°F to 555°F
SG level ramps up (SG area increases) as power increases.
How many GWD tanks do we have?
U1/2 2 in AB and 2 in int rad waste
U3 2 in AB and 1 in int rad waste
What is normal RCS pressure?
What is Tave at 100% power?
579 deg F
What is Thot at 100% power?
~600 deg F
What is Tcold at 100% power?
~556 deg F
What are the differences between the units?
U1&U2 have the Series, High Pressure and switchover LPI modes.
U3 does not have a LP-4 (used for switchover and high pressure mode).
U1&U2 do not have LPI cooler bypasses.
U1&U2 have electric LPI cooler inlet valves.
U1 has LP-105 (Alt path for post LOCA dillute).
U2 LP-4 must remain open at power for Boron dillution backup.
Purpose of LPI High Pressure Mode
Mainly uses A LPI train as the primary method of DHR. Normally used for heatup can be used for cool down but it is limited.
Purpose of LPI Series Mode
Uses both LPI coolers and is preferred for cooldown.
Purpose of LPI Switchover Mode
Can be used for heat up or cool down if the other modes are unavailable.
Purpose of Post LOCA Boron Dilute
Two flowpaths per unit required
Will provide 40 gpm flow through the core by removing inventory from the hot leg
Unit 1's backup flowpath is different due to the elevation of the LPI Pump suction line
RCS pressure must be <375 psig to Open
Discharge Pressure of a LPI pump.
Design flow of LPI pump
> 5% power Critical ( >= 0.99 keff)
<= 5% power Critical ( >= 0.99 keff)
>= 250 degrees RCS Not Critical ( < 0.99 keff)
250 - 200 deg RCS
<= 200 deg RCS
At least 1 head bolt detentioned
No fuel in core
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