AP-18 (letdown line failure)

Question 1

What are the symtom/ entry conditions to AP-18 (letdown line failure)?

Answer 1

• VCT lvl lowering
• letdown flow hi or low
• rising charging flow
• possible hi rad levels
• L_pzr and P_rcs lowering

Question 2

AP-18

What action do you take if after you isolate letdown Lpzr is still lowering?

Answer 2

Go to AP-1