TS 3.3.5 ESFAS Instrumentation

Question 1

LCO 3.3.5
___ ESFAS trip and bypass removal channels for each Function in Table 3.3.5-1 shall be OPERABLE

APPLICABILITY: ___

Answer 1

Four

APPLICABILITY: According to Table 3.3.5-1

Question 2

LCO 3.3.5
ACTIONS
NOTE: ___

Answer 2

NOTE: Separate Condition entry is allowed for each ESFAS function

Question 3

Table 3.3.5-1 ESFAS Instrumentation

What are the 7 FUNCTIONS?

And WHEN are they Applicable?

Answer 3

SIAS
CSAS
CIAS
MSIS
RAS
AFAS-1 & AFAS-2

All are Applicable Modes 1, 2 and 3

Question 4

LCO 3.3.5 CONDITION

A. 1 or more Functions with 1 Auto ESFAS trip channel inoperable

Answer 4

A.1 Place channel in bypass of trip (1 hour)

AND

A.2 Restore channel to OPERABLE status (Prior to M2 entry following next M5 entry)

Question 5

LCO 3.3.5 CONDITION

B. 1 or more Functions with 2 Auto ESFAS trip channels inoperable.

Answer 5

B.1 Place 1 channel in bypass and the other in trip (1 hour)

Question 6

LCO 3.3.5 requires ___ channel components necessary to provide an ESFAS actuation to be OPERABLE.

Answer 6

ALL

Example: CTMT Pressure - High (has 4 channels A-D)

Question 7

For PZR Pressure-Low:
When the trip set point has been lowered below the bypass permissive set point of ___, the PZR Pressure - Low reactor trip, CIAS, and SIAS actuation may be manually bypassed in preps for SDC.

Answer 7

400 PSIA

• This is an example of channels of Bypass Removal that are ALSO required per this TS (LCO applies to bypass removal feature ONLY)

Question 8

The most common causes of channel inoperability are ___

Answer 8

Outright Failure or Drift of the bistable or process module sufficient to exceed the tolerance allowed by the plant specific set point analysis.

Question 9

LCO 3.3.5 CONDITION

C. One or more Functions with one automatic bypass removal channel Inoperable.

Answer 9

C.1 Disable bypass channel (1 hour) OR
C.2.1 Place affected auto trip channel in bypass or trip (1 hour) AND
C.2.2 Restore bypass removal channel and associated auto trip channel to Operable status (Prior to M2 following next M5 entry)

Question 10

LCO 3.3.5 CONDITION

D. One or more Functions with two automatic bypass removal channels inoperable

Answer 10

D.1 Disable bypass channels (1 hour) OR

D.2 Place one affected auto trip channel in bypass and place other in trip (1 hour)

Question 11

If the bypass removal channel for any operating bypass cannot be restored to OPERABLE status, the associated ESFAS channel may be considered OPERABLE only if ___

Answer 11

The bypass is NOT in effect

Question 12

If one ESFAS channel is in TRIP and a second channel is in BYPASS, a third inoperable channel would place the unit in ___

Answer 12

3.0.3

Question 13

LCO 3.3.5 CONDITION

E. Required Action and associated Completion Time not met.

Answer 13

E.1 Be in M3 (6 hours) AND

E.2 Be in M4 (12 hours)

Question 14

LCO 3.3.5 - SR 3.3.5.5 - Perform a CHANNEL FUNCTIONAL TEST on each auto bypass removal channel.

Answer 14

Once within 92 days prior to each RX startup

Question 15

Per LCO 3.5.3, Condition B, One of the two inoperable channels will need to be restored to OPERABLE status prior to the next required CHANNEL FUNCTIONAL TEST because ___

Answer 15

…channel ST’s on an OPERABLE channel requires that the OPERABLE channel by placed in bypass. However, it’s not possible to bypass more than one ESFAS channel, and placing a second channel in trip will result in an actual ESFAS actuation.