RCS Flashcards
What are the RCS penetrations below centerline?
- RHR Suction from Loop 2 Hot Leg
- Loop flow instruments (High Side Tap)
- Drain Lines
- NR Thot Scoops
- Half Loop level indication connection (NLI-122)
What loops does Pzr spray come from?
Loops 3 and 4 CLs
What loops have Mid Loop Level Indicator penetrations?
Loops 3 and 4 CL (Intermediate legs)
What loop has Pzr Surge line penetration?
Loop 3 HL
What loop has RHR suction penetration?
Loop 2 HL
** (Does not extend into flowpath)**
What loop has NLI-122 half loop indicator penetration?
Loop 2 HL
What loop has Normal Charging penetration?
Loop 4 CL
What loop has alternate charging penetration?
Loop 1 CL
What loop has normal LD penetration?
Loop 4 CL (Intermediate Leg)
What is the design basis of the Rx Vessel Head Vent?
- vent a volume of h2 equal to half the volume of the RCS in 1 hr at system design # and temp
- 1/4” orifice prevents leakage > capacity of 1 CCP
When is RVLIS for Narrow Range Used?
No RCPs running.
Gives indication from top to bottom of vessel
When is RVLIS for Wide Range Used?
With RCPs running
- Looks for Void Fraction (50%)
When is RVLIS for the Upper Range Used?
When all RCPs Off
- Generally used in EOPs to assess whether a RV head void exists for natural circulation cooldown procedures.
What are the inputs to the subcooling meter?
- Auctioneered HI CETCs or WR RTD temps
- Auctioneered LO RVLIS WR press
What is the normal Tavg for both units?
- Unit 1: 571ºF
- Unit 2: 574ºF
Per TS 3.4.3 (RCS Pressure vs Temperature), what is the fastest the RCS can be heated up?
< 60ºF/Hr
Per TS 3.4.3 (RCS Pressure vs Temperature), what is the fastest the RCS can be cooled down?
< 100ºF/Hr
What is the temperature for minimum RCS Temper per 3.4.2 (RCS min temp)? What must be done if violated?
> 541ºF
If violated, be in MODE 2 with keff < 1.0 within 30 mins
What does TS 3.4.6 (RCS Loops, Mode 4) require?
2 RCS or RHR loops (2/6) One I/S
all loops can be removed for 1 hour / 8 hr if other requirements met
What does 3.4.7 (RCS Loops, Mode 5 Loops Filled) require?
1 RHR loop + 1 more RHR loop
OR 2 S/G water level 420” > WR
RHR pp can be out for 1 hour / 8 hr if other requirements met
What does 3.4.8 (RCS Loops, Mode 5 Loops drained) require?
2 RHR loops OPERABLE
1 RHR loop in operation
All RHR can be out for < 30 minutes
when switching loops if requirements are met.
What’s the purpose of RVLIS?
- Verify adequate core cooling exists during accident
- Inputs to subcooling monitor
- Determines when Accumulators should be isolated to prevent nitrogen injection to RCS.
- Can be used for Reactor Vessel Head fill and vent.
Which RVLIS correlation do you use when filling and venting RCS?
UPPER Plenum RVLIS with RCPs off when filling and venting RCS with RCP bump method
What are the RCS leakage limits per TS 3.4.13 (RCS Operational Leakage)?
RCS operational LEAKAGE shall be limited to:
- NO pressure boundary
- 0.8 gpm unidentified
- 10 gpm identified
- 150 gal/day for 1 S/G