Intro to EPN

Question 1

What is E-0?

Answer 1

Scram Entry Procedure

Question 2

What are ERPs?

Answer 2

Emergency Recovery Procedures. LOCA/LOFA/Loss of Power/Loss of DCS

Question 3

What are FRPs?

Answer 3

Function Restoration Procedures, Response to barrier degradation

Question 4

What are ECAPs?

Answer 4

Emergency Contingency Action Procedures. Loss of commercial and diesel power

Question 5

What is CSFST?

Answer 5

Critical Safety Function Status Tree. Barrier status

Question 6

What are E-0 entry conditions?

Answer 6

Any scram.
ATWS
Loss of com, diesel, or com/diesel power in outage
Complete loss of primary flow in outage
Uncontrolled loss of primary coolant in outage
Any time pzr and gs pump shutoff ESF actuation has actuated or 2 or more high-high inlet pressure alarms received during outage
At discretion of CRS/SS

Question 7

What are the barriers?

Answer 7

Fuel clad
PCS
Confinement

Question 8

What are the critical safety functions?

Answer 8

Subcriticality
Core Cooling
Confinement

Question 9

Describe subcriticality safety function

Answer 9

Removes energy input to fuel clad and PCS

Question 10

Describe core cooling safety function

Answer 10

Ensure PCS temp <240F safety limit and adequate decay heat removal

Question 11

Describe the critical safety function path colors

Answer 11

RED - extreme challenge
ORANGE - challenge
YELLOW - safety function not satisfied
GREEN - safety function satisfied

Question 12

What is subcriticality red path?

Answer 12

Power >NL - go to FRP-S.1

Question 13

What is subcriticality orange path?

Answer 13

Period not negative or infinite -go to FRP-S.1

Question 14

What is subcriticality yellow path?

Answer 14

LCRM not placed in operate or indicating offscale + period not as expected for shutdown - Go to FRP-S.2
LCRM not placed in operate or indicating offscale + countrate not ramping down as expected or stable - Go to FRP-S.2

Question 15

What is core cooling red path?

Answer 15

FIS vessel pressure PI-534x not greater than 30 psia - go to FRP-C.1
Vessel level LI-535x not greater than 6’6” (88’6”) - go to FRP-C.1
Emergency flow less than 3800 GPM and vessel dp <15 psid - go to FRP-C.2
PPS outlet temp >180F - Go to FRP-C.3

Question 16

What is core cooling yellow path?

Answer 16

secondary flow DPT-2-13 <1.2 psid and ucw flow FIC-2-4 <1500 PGM - go to FRP-C.3

Question 17

What is confinement red path?

Answer 17

RMS-1 setpoint exceed 2/3 stack rad monitors >45 mr/hr and isol has not been verified - go to FRP-Z.1

Question 18

What is confinement yellow path?

Answer 18

isolation not verified - go to FRP-Z.1

Question 19

How many passes through CSFSTs are required prior to transfer to 10/20 minute intervals?

Answer 19

Three passes required