AOPs

Question 1

Turbine Trip

Answer 1

3550
Entry: Turbine or generator trips
Notes: Anticipate ∆Sk from poisons
Rod withdrawals ≤2 steps/min, dilution ≤15pcm/min
∆P 100-120# for swap to FRBVs
∆P: 60-80# (1-3%), 100-120# (6-9%), 130-150# (10-14%), 160-180# (15-25%)
Verify turb tripped before opening o/p bkr to prevent overspeed
It takes 5-7 sec for exciter field contactors to open
Transition to s/u doesn’t require TG s/d

Question 2

Rod Control Malfunction

Answer 2

3552
Entry: Uncontrolled rod motion
Rods >12 steps misaligned or dropped
DRPI or rod motion failure
Notes: Urgent failure inhibits all motion for rods on power cabinet

Question 3

High RCS Activity

Answer 3

3553
Entry: High activity from samples
From Rad Monitor Alarm Response

Question 4

DC Bus Ground

Answer 4

3551
Entry: Battery Trouble alarm
Ground voltage increasing or >110V

Notes: Checking for ground on chgr, inv, or battery can be in any order
Consult w/mtnc before isolating protective relays or meters

Question 5

RCS Leak

Answer 5

3555

Entry: Leak

Question 6

Secondary Chemistry

Answer 6

3557
Entry: MB6 hi conductivity or sodium alarms
Samples out-of-spec

Note: Reducing CWS speed can change seawater intro rate and aid identification of leaking waterbox

Question 7

Loss of SW

Answer 7

3560
Entry: Partial or total los of SW (pp trip, no press, no flow in SR HXs)

Note: ARPs for pipe rupture

Question 8

Loss of CCP

Answer 8

3561
Entry: Partial or total loss of CCP (leak, rupture, pp trip, loss of SW)

FO: If RCP bearing oil >195ºF, seal inlet ≥190ºF, seal outlet ≥260ºF, or CCP press can’t be maintained to both CTMT headers → trip the affected RCPs

Question 9

Loss of One Protective Channel

Answer 9

3564
Entry: Loss of power to a VIAC
TCA: Terminate excess charging ≤8.4 min on CHS malfunction that raises RCS inventory
Note: Loss of VIAC 1/2 deenergizes EGLS

Question 10

Loss of CTMT Vacuum/Integrity

Answer 10

3565

Entry: Any indication of loss

Question 11

Emergency Breaking of CTMT Vacuum

Answer 11

3568

Entry: Any condition requiring emergency access

Question 12

Instrument Failure Response

Answer 12

3571
Entry: Instrument or controller failure that results in abnormal indication or response
Notes: Rods challenge not be left in Auto while diagnosing unless runback
If loop 3 Tc x-tagged or any SF x-tagged, calorimetric shifts to NIs
If calorimetric on NIs, failure of one channel disables it

Question 13

Rapid Downpower

Answer 13

3575
Entry: Power reduction faster than 0.5%/min (3204) required
Notes: For plant s/d, 30% target is preferred
Rx power to MW correlation varies based on seasonal temps and equipment performance
≤25 min to complete if ISO-NE requested
If SI actuates, rapid boration must be restored
∆T is more accurate power indication than NIs
Adjusting load rate, boration, or rods acceptable for controlling the plant
Maintain 23-25% while using FRVs

Question 14

Loss of Normal and Offsite Power to 34C/D

Answer 14

3577
Entry: 0V on bus
EDG starts and loads
3560/3580/3581, assoc ARPs
FO: If RCP bearing oil >195ºF, seal inlet ≥190ºF, seal outlet ≥260ºF, or CCP press can’t be maintained to both CTMT headers → trip the affected RCPs → E-0

Question 15

Response to Turbine Runback

Answer 15

3579
Entry: Grid instabilities
C-3, C-4, or SWC runback
Turb stop/control valve closure

Question 16

Immediate Operator Actions

Answer 16

3581

Entry:

Question 17

Rx Trip or SI

Answer 17

E-0
Entry: Manual or automatic Rx trip or SI actuation
FO: Trip RCPs if