RQ-C-4831 (Cntmt Spray, Ice, DIS, CSF)

Question 1

What causes VCR-10/11 and VCR-20/21 (Glycol Isolation Valves) to close?

Answer 1

• Containment Isolation Phase A
• Lo Lo Expansion Tank level

Question 2

What actuations occur on a Hi-Hi Containment Pressure signal

Answer 2

• CTS Signal (valves position)
• Phase B (CTS pumps start, Ph B valves close)

Question 3

What is the purpose of having sodium hydroxide in the SAT

Answer 3

• Maintains pH between 7-10 (retention of iodine and minimizes stress corrosion cracking)

Question 4

An RO notices that after a fault in SG #22 that containment pressure is 2.5 # and rising. Should they actuate CTS?

Answer 4

• NO. CTS is not actuated early per OHI-4023

Question 5

Containment pressure is at 4.5# after a LOCA. What should have actuated?

Answer 5

• Ph B
• SLI
• CTS

Question 6

Actions per E-0 are in progress and the Crew sees containment pressure at 3.5 psig and rising with no phase B. The Crew manually actuates phase B. What actions should they expect to occur per their verification?

Answer 6

• Ph B
• CVI
• CTS