TS 3.1.6 Shutdown CEA Insertion Limits

Question 1

LCO 3.1.6 All shutdown CEAs shall be withdrawn to ___

APPLICABILITY: ___

Answer 1

…withdrawn to greater than or equal to 147.75”

APPLICABILITY: MODE 1 AND
MODE 2 with any Regulating CEA not fully inserted

Question 2

LCO 3.1.6 Applicability NOTE states This LCO is not applicable while performing ___

Answer 2

SR 3.1.5.3 - CEA Exercising (5”) to verify FSCEA freedom of movement (trippability)

Question 3

Accident analysis assumes that the shutdown CEAs are fully withdrawn any time the reactor is critical. This ensures that:
___
___

Answer 3

a. The minimum SDM is maintained; and

b. The potential effects of a CEA ejection accident are limited to acceptable limits

Question 4

The acceptance criteria for addressing shutdown CEA as well as Regulating CEA insertion limits and inoperability or misalignment are that:

a. ___
b. ___

Answer 4

a. There be no violation of:
- SAFDLs
- RCS Pressure boundary integrity

b. The core remains subcritical after accident transients

Question 5

The most limiting SDM requirements for MODES 1 and 2 at EOC come from ___

Answer 5

Steam Line Break (SLB)

Question 6

Although the most limiting SDM requirements at EOC are much larger that those at BOC, the available SDM obtained via scramming of the CEA’s are ___

Answer 6

…also substantially larger due to must lower boron concentration at EOC.

Question 7

APPLICABILITY: The shutdown CEAs must be within their insertion limits with the reactor in MODES 1 and 2. The applicability in MODE 2 begins anytime any regulating CEA ___

Answer 7

…is NOT fully inserted.

Question 8

LCO 3.1.6 Condition

A. One shutdown CEA not within limit.

Answer 8

A.1 Restore shutdown CEA to within limit (2 Hours)

Question 9

LCO 3.1.6 Condition

B. Required Action and associated Completion Time not met.

Answer 9

B.1 Be in MODE 3 (6 Hours)