Reactor Level Setpoints/Actuations and Basis

Question 1

Level 8 219”?

Answer 1

Rx Scram (M.S. In Run)
Trip Main Turbine
Trip RFPT, MDFP
Close E22 F004 Inj Vlv
Close E51 F045 Stm Adm Vlv

Stop Positive Reactivity Addition To Rx
Aimed at avoiding carryover and damage to the turbine.
Avoid Overfeeding Vessel

Question 2

What does a Level 7 205” indicate?

Answer 2

Hi Level Alarm alerts operator to a problem

This indicates an abnormal condition that requires attention.

Question 3

What is the normal operating band for Level 5?

Answer 3

201” N.R. with a range of 192-200” (Level Program)

This range ensures no carryover/under and sufficient NPSH for B33 pumps.

Question 4

What happens at Level 4 197” ?

Answer 4

Lo Level Alarm
B33 Runback (With RFPT trip) to 17%, FCV Position = 48 Mlb/Hr

Alerts operator to problems and necessitates reducing power to handle load.

Question 5

What action is taken at Level 3 178”?

Answer 5

Scrams reactor
B33 shift to slow speed
RHR SDC isolation Ns4
ADS Confirmatory Sign
Setpoint Setdown activated

Avoids carryunder and low NPSH while isolating possible sources of leakage.

Question 6

What is initiated at Level 2 130”?

Answer 6

HPCS & RCIC start
Div 3 D.G. start
NS4 BOP isolation
B33 pump trip to off
G33 isolation

Prepares for possible LOCA and anticipates recovery of inventory prior to level 1.
Prepare To Load Bus
Insert Negative Reactivity For ATWS
Isolate Possible Source Of Leakage

Question 7

What systems are started at Level 1 16.5”?

Answer 7

LPCS start
LPCI (RHR) start
Div 1 & 2 D/G start
ADS initiation (105 Sec Td)
AEGTs (M15) starts
MSIV auto closure

Ensures core coverage and prepares to limit radiation release in a LOCA situation.
Prepare To Load Bus
Allow Low Pressure ECCS Systems To Inject
Prepare To Process Cont. Atmosphere

Question 8

Fill in the blank: Level 5 normal operating band is 201” N.R. with a range of _______.

Answer 8

192-200”

Question 9

True or False: Level 1 actions include injecting to keep the core covered.

Answer 9

True