REACTOR COOLANT SYSTEM

Question 1

What is the maximum allowable RCS activity for I-131?

Answer 1

≤ 0.35 μCi/g.

Question 2

What is the maximum allowable RCS activity for Xe-133?

Answer 2

≤ 797 μCi/g.

Question 3

Why must RCS dissolved gas be maintained below 100CC/kg?

Answer 3

To prevent accumulation in CRDM (Control Rod Drive Mechanisms).

Question 4

What is the limit for unidentified RCS leakage per T.S. 3.1.6?

Answer 4

<1 gpm.

Question 5

What is the limit for total RCS leakage per T.S. 3.1.6?

Answer 5

<10 gpm.

Question 6

What is the limit for RCS leakage plus losses per T.S. 3.1.6?

Answer 6

<30 gpm.

Question 7

What action is required if RCS leakage exceeds T.S. 3.1.6 limits?

Answer 7

Enter Hot Shutdown (HSD) within 24 hours.

Question 8

What action is required for a non-isolable strength boundary leak?

Answer 8

Enter Hot Shutdown (HSD) and start cooldown (C/D) within 24 hours.

Question 9

What is the limit for primary-to-secondary leakage in one OTSG?

Answer 9

<150 gallons per day (gpd).

Question 10

What action is required if primary-to-secondary leakage exceeds 150 gpd in one OTSG?

Answer 10

Enter Hot Shutdown (HSD) within 6 hours and Cold Shutdown (CSD) within 36 hours.

Question 11

What is required when Rx >2% power for RCS leak detection?

Answer 11

Two RCS leak detection methods with one sensitive to radioactivity must be operable. If RM-A-2 is INOP, sample RB every 8 hours and restore in 72 hours.

Question 12

What is the pressurizer heat-up/cooldown rate limit?

Answer 12

Limited to 100°F/hr per T.S. 3.1.2.3.

Question 13

What is the required pressurizer level for Rx to remain at 1% Δk/k?

Answer 13

Pressurizer level must be between 80-385 inches or go to HSD with CRD breakers open in 6 hours.

Question 14

What is the volume per inch of the pressurizer?

Answer 14

12 gallons per inch.

Question 15

What happens to pressurizer heaters at 80 inches or loss of ICS AUTO?

Answer 15

All heaters de-energize except those on 1P/1S.

Question 16

What is the action if one ES power supply is INOP for pressurizer heaters?

Answer 16

Restore in 7 days or go to HSBY in 6 hours.

Question 17

What is the action if two ES power supplies are INOP for pressurizer heaters?

Answer 17

Restore in 72 hours or go to HSBY in 6 hours.

Question 18

What is the normal operational state of the PORV (RC-RV-2)?

Answer 18

Closed, except for LTOP operations.

Question 19

What are the conditions for taking the PORV OOS when RCS <313°F?

Answer 19

HPI pumps racked out, MU-V-16s closed with breakers open, MU-V-217 closed, or Rx head off.

Question 20

What is the PORV NDTT switch setpoint?

Answer 20

Hit the switch when RCS <565# and RCS <313°F.

Question 21

What is the lift setting for code safeties (RC-RV-1A/B)?

Answer 21

2500# ±1%.

Question 22

What is the function of the pressurizer spray valve (RC-V-1)?

Answer 22

Opens at 2205# to 40% and can be opened to 100% in manual but must be placed back in AUTO.

Question 23

What is the purpose of the spray bypass flow?

Answer 23

Prevent thermal shock to the spray nozzle and equalize boron concentration within 50 ppm.

Question 24

Where do RCS high point vents discharge?

Answer 24

Hot leg vents to RCDT, Rx vessel vents to containment atmosphere.

Question 25

What are the tensile and compressive limits for OTSG tube-to-shell temperature differential?

Answer 25

-70°F (tensile) and +60°F (compressive).

Question 26

What is the relief valve and rupture disc setpoint for the RCDT?

Answer 26

Relief valve at 40#, rupture disc at 55#.

Question 27

What are the conditions for natural circulation?

Answer 27

ΔT <50°F, THOT <600°F, TCold approaches TSAT for OTSG pressure, OTSG heat removal exists, incores track THOT, SCM ≥25°F.

Question 28

What is the maximum cooldown rate for RCS?

Answer 28

50°F/hr to prevent steam bubble formation in the Rx head.

Question 29

What is the action if pressurizer level drops to 75 inches during LOOP with G9 on 1S Bus?

Answer 29

Manually de-energize the heaters and restore level before re-energization.

Question 30

What are the RCS leakage specifications?

Answer 30

Go to HSD in 24 hours except for pressure boundary (cooldown to CSD initiated in 24 hours) and PSLR (6 hours to HSBY, 36 hours to CSD).

Question 31

What is the RCS system activity limit for I-131?

Answer 31

<0.35 μCi/g.

Question 32

What is the secondary system activity limit?

Answer 32

<0.10 μCi/g or be in HSBY in 6 hours.