RCS

Question 1

Purpose of RCS

Answer 1

Main- xfr heat from core to secondary

Sec- pressure boundary

      - second fission product barrier
      - promote nat circ
      - moderate neutrons

Question 2

RCS design bases

Answer 2

Ensure every penetration has 2 auto close cap- cnmt isolation

Leakage detection capabilities(rad mon, smp lvl, cfcu)- RCS integrity

Handle +/-10 %step, 5% ramp 100-15% pwr, 95% LR- reliable plant load chgs

Question 3

Location PT-405

Answer 3

Loop 3 hot leg

Question 4

Location PT-403

Answer 4

Loop 4 hot leg

Question 5

Location PT-403A

Answer 5

Loop 4 hot leg

Question 6

Location PT-405A

Answer 6

Loop 4 hot leg

Question 7

WR RCS Press inputs

PT-403/ 405

Answer 7

• SCMM
• RVLIS
• SPDS
• PPC
• CR ind

Question 8

WR RCS Press inputs

PT-403A/ 405A

Answer 8

• SPDS
• RHR intlk, (suct. vlvs won’t open if >390 psig)(8701/8702)
• Pzr PORV open signal if > 435 psig (if LTOP armed)
• CR ind

Question 9

RCS flow xmtrs
Lp 1 FT-414, 415, 416
Lp 2 FT-424, 425, 426
Lp 3 FT-434, 435, 436
Lp 4 FT-444, 445, 446

Answer 9

• SSPS (low flow Rx Trip, < 90% flow)

- CR ind

Question 10

Delta T outputs

Answer 10

• indication
• RIL comp (PPC)
• OP(delta)T
• OT(delta)T

Question 11

Tave outputs

Answer 11

• OP(delta)T
• OT(delta)T
• P-12 (low-low Tave permissive)
• FW iso
• PPC
• ind
• rod cntrl (auct hi)
• stm dmps (auct hi)
• Pzr lvl cntrl (auct hi)

Question 12

Auctioneered delta T outputs

Answer 12

• delta T deviation alarm

- RIL calc (pwr input)

Question 13

Auctioneered Tave outputs

Answer 13

• Tave deviation alarm
• Tave hi alarm
• Rod cntrl
• stm dmp cntrl
• Pzr lvl ref
• (if fails hi, thrown out if 10 deg deviation)

Question 14

Precautions and limitations for RCS

Answer 14

• during dilutions maintain Pzr [B] and RCS [B] w/in 50 ppm
• max c/d 100 deg/ hr
• max h/u 60 deg/ hr
• maintain press / temp w/ in PTLR
• minimum temp criticality (>541 deg)

Question 15

Unit differences

Answer 15

Rx vessel internals differences => unit 2 higher flow rate