RQ-C-4863 (E-3 Support & Contingency Series)

Question 1

Which of the following conditions require a transition to ECA-3.1 (SGTR w/ LOCA subcooled recovery)

A) SGTR w/ LOCA
B) SGTR w/ same SG faulted
C) SGTR w/ a different SG faulted
D) SGTR w/ a second SG ruptured
E) SGTR w/ all stop valve failing to close

Answer 1

A) SGTR w/ LOCA
B) SGTR w/ same SG faulted
E) SGTR w/ all stop valve failing to close

Question 2

One of the Major Actions of ECA-3.2 (SGTR w/ LOCA saturated recovery) is to “Depressurize the RCS to minimize RCS leakage” This is accomplished by:

A) Minimizing subcooling to minimize RCS leakage
B) Establishing saturation to minimize leakage

Answer 2

B) Establishing saturation to minimize leakage

Question 3

Procedure ECA-3.2 (SGTR w/ LOCA Saturated Recovery) can be entered directly from:

A) E-3 SGTR
B) ECA-3.1 SGTR w/ LOCA Subcooled Recovery
C) ES-3.2 Post SGTR Cooldown using blowdown
D) ES-3.3 Post SGTR Cooldown using Steam Dump

Answer 3

B) ECA-3.1 SGTR w/ LOCA Subcooled Recovery

Question 4

The first major action of ECA-3.3 (SGTR w/ loss of pressure control) is to try to restore Pressurizer pressure control. What must occur to proceed to the SI termination steps in this procedure?

A) Ruptured SG level >67%
B) RCS pressure is above the SI pump shutoff head
C) Pressurizer level > 16% (20%)
D) A main steamline isolation has occured

Answer 4

A) Ruptured SG level >67%
C) Pressurizer level > 16% (20%)

Question 5

The control room operators have implemented ECA-3.3, SGTR without Pressurizer Pressure Control.

The following conditions exist:
SI has been terminated.
Normal charging flow has been established.
Pressurizer level is off-scale low.
An RCS cooldown to 350F has been started.

Why does the procedure direct the operators to adjust charging flow to maintain subcooling rather than to restore PRZ level? (Step 27)

Answer 5

• Raising Pressurizer level would raise RCS pressure which would raise RCS leakage