3.6 Cnmt systems

Question 1

3.6.7 Cnmt Spray

The CS system is considered operable if the spray additive system has sufficient volume and concentration to maintain what pH in the CNMT recirc sump?

What is the purpose for maintaining this pH?

Answer 1

pH range from 8.0 - 9.5

Maximize the iodine removal mechanism from CNMT atmosphere

W/O

inducing caustic stress corrosion cracking

Question 2

3.6.4 Cnmt Press

What are the T.S. Limits on Cnmt Press?

What are the basis for the limits?

Answer 2

(-)1 psig to (+)1.2 psig (including)

upper limit (+1.2) - maintains Cnmt Press < design limit (47 psig) during DBA (SLB @ 70% pwr)

lower limit (-1) - maintains Cnmt Vacc < design limit (-3.5 psig) during inadvertent SI

Question 3

3.6.3 CIV

If you have two CIV in same flow path inoperable what action must you take and how long do you have?

If you have one CIV inoperable what action must you take and how long do you have? (two vlv in flowpath)

Answer 3

Two

isolate flowpath, 1 hour

One

isolate flowpath, 4 hours