E-1, LOCA

Question 1

E-1

What are the two TCOAs in E-1?

How do they affect how the procedure is entered?

Answer 1

• Trip RCPs
• secure RHR pump (not run w/o CCW flow > 30 min)

When entering E-1, if RCPs running => perform update instead of procedure transition brief.

Question 2

E-1

Why do we isolate accumulators when P_rcs < 250 psig?

Answer 2

Prevent N₂ injection into RCS (if N2 is injected in RCS, during long term recovery it could retard depressurizing RCS)

Question 3

E-1

If you have a LOCA, depending on size, what procedures can E-1 direct you to?

Answer 3

Small leak - E-1.1, SI term, once break flow = inj flow

med leak - E-1.2, post LOCA c/d, press still lowering

huge leak - E-1.3, cold leg recirc