E-0 Daily Quiz Flashcards
What are E-0 Major Action Categories?
1) Verify auto actions
2) Identify optimal recovery (E-1, E-2, E-3, E-1)
3) Shutdown Equipment and continue identification of appropriate recovery procedure
E-0 Foldout Page
1) Cold Leg Recirc
2) AFW switchover
3) RCP Trip - Phase B or RCS 1300# and SI or CCP Run
4) Faulted SG AFW Isolation - If 1 faulted SG and heat sink stop AFW to faulted
E-0 Immediate Actions
1) Check Reactor Trip > RNO manual check log pwr <5% and neg startup rate
2) Check Turbine Trip > RNO manual, amsac, sgsv
3) Check A/C Emergency Buses > RNO ECA 0.0 or sups if A/D energized
4) Check SI > RNO check required ES0.1 Rx Trip
TDAFP Drop 50 vs Drop 10
If both drop 50 and drop 10 are lit, attempt to reset drop 50. If it clears the TDAFP tripped on electronic overspeed. If standing local action is required.
E-0 SI termination criteria
Sub-cooling > 40F
Heat Sink
RCS Pressure stable or rising
PRZ Level
What actuates SI
Cnmt P > 1# on 2/3 ch
Pressurizer P Low 1775# 2/3 ch
Stmline d/p 100 psid 1 less than 2 others
Stmline Low P 500 pig 1/1 on 2 SGs
If the Rx power cannot be verified < 5% or negative startup rate in E-0, where do you go?
FR-S.1
Prior to tripping the turbine (RNO E-0) what should you check?
That the RX is tripped
What is the duration of the CTS timer?
U1 4 min / U2 30s
E-0 why trip RCPs when RCS P < 1300#
Minimize RCS mass loss due to SMBLOCA
E-0 - Order of Diagnostics and why?
E-1 If PORV stuck open
E-2 Easy to find / fix and masks other issues
E-3 Stop offsite dose a lot of TCAs
E-1 Auto will manage
E-0 Why limit AFW between 240 and 450K pph?
240 pph = maintain min AFW for heat sink
450 pph = prevent overcool RCS
E-0 Modes of applicability
Rx trip Mode 1 and 2
SI Mode 1-3
When can ES-0.0 be entered and why would you?
SI is required, E-0 has been exited and an E series procedure is in progress
ES0.0 can be implemented in the event one is in the incorrect procedure
ES0.0 Major Action Categories
1) Check SG not Faulted
2) Check SGs not Faulted and not isolated
3) Check SGTR
ES0.1 Major Action Categories
1) Primary stable at no load Borate U1 150 ppm U2 160 ppm / rod stuck 2) Secondary stable at no load 3) Ensure Power is available 4) Establish / Maintain forced circ of RCS 5) Maintin RCS stable
ES0.1 FOP
SI Actuation
AFW switchover
E-0 transition
ES0.1 why reset AMSAC?
The TDAFP is required to be operable in Mode 3. A standing AMSAC signal locks out auto start of TDAFP.
ES0.1 why transfer stm dumps to stm pressure mode?
Prevent large RCS temperature oscillation due to long transit time of RCS inventory (natural circ)
What is P-6?
ON - Any IR > 10^-10
OFF - 2/2 IR < 6x10^-11
Allows manual SR hi flux trip block
When is ES0.1 entered?
No SI actuated or required
ES0.2 Major Action Categories
1) Try to start RCPs
2) C/D and depress RCS w/ no void growth
3) Lock out SI (Accum RCS<100# LTOP and SI pump when RCS is < 350F)
4) Place RHR I/S (RCS Temp <350F and 350-400#)
5) Cool down to cold shutdown 25F/hour w/ RHR
ES0.2 Is entered when?
Natural Circ cool down is required
ES0.2 FOP
SI Actuation (SI will get blocked = you initiate) AFW switchover ES0.3 is voids expected E-0 if SI occurs RCP restart
ES0.2 what are the sub cooling limits?
> 90F if CRDMs are running
>220F is less than all CRDMs
ES0.2 what if Cold Shutdown boron is not achieved in step 3?
Loop back to step 2 and wait until adequate SDM
ES0.2 what is basis of 25F / hr cool down rate?
Ensures Rx vessel heads cool with RCS and no voids form in Rx vessel
ES0.2 what will be used to depress the RCS?
Aux Spray. Normal Spray will be unavailable bc no RCPs
ES0.2 How do we verify no voids in vessel?
RVLIS Upper Plenum level >92%
How is Aux Spray controlled?
Opening the Normal PRZ spray lowers Aux. Closing normal spray raises aux.
ES0.2 Why are SI pumps locked out at 350F?
LTOP
ES0.3 Major Action Categories
1) Try to start RCP - Do not if seal inj. was lost
2) Cool down and depress RCS monitor void growth
3) Lockout SI (Accum <1000# RCS and SI <350F RCS)
4) Place RHR in service (RCS <350F and 350-400#)
5) Cooldown to cold shutdown 100F / hr
When can you enter ES0.3
Borated to cold shutdown and blocked low P SI (first 13. steps ES0.2)
What is P-11?
2/3 PRZ P <1910# allows SI low PRZ P block
ES0.3 FOP
SI Actuation
AFW Switchover
E-0 if SI occurs
RCP Restart Criteria
ES0.3 Cool down rate?
100F / hr
ES0.3 Cool down rate?
100F in 60 minutes
ES0.3 what are the PRZ lvl limits and why?
> 34 (37)% heaters covered
<90% maintain sum bubble
SUP11 What are the indication of Nat Circ?
1) RCS Subcooling >40F
2) Stable or Lowering: SG P, RCS HL, CETCs
3) RCS CL temp at saturation for SG Pressure
SUP10 Why attempt RCP restart?
RCS mixing, RCS temp / press control, improves PRZ lvl control
What three factors impact Spray Flow?
Vessel and RCS Piping dp, PRZ lvl, coolant velocity head at spray flow scoop
What three factors impact PRZ Spray Flow?
Vessel and RCS Piping dp, PRZ lvl, coolant velocity head at spray flow scoop
SUP10 How do we minimize loss of sub cooling / maintain RCS pressure control during RCP start?
Raise PRZ level >37%
Raise Subcooling 40F (Level and sc are RCP restart criteria)
Raise Pressure to shrink bubble
Saturate PRZ Liquid using heaters
RCP restart criteria ensure no SMBLOCA
SUP10 What if RVLIS is <92% during start?
There is a void in the vessel head. Raise PRZ level to 84% and sub cooling >62F. This will ensure adequate inventory when the void collapses
SUP10 what if the void is swept into the loops?
Degraded primary to secondary heat transfer - voids swept into sg u-tubes
RX trip on natural circ. What will happen to RCS parameters?
Tavg will lower, Core Delta T will lower, and TCold will rise
Why is RCP 3 the desired RCP to start?
Most flow bc greatest d/p between spray and surge line
What happens if you exceed a Safety Limit 2.1.2 RCS Pressure >2735
Mode 1 or 2: Immediate correct and Mode 3 in 1 hour
If mode 3-5: restore within 5 min
