Precourse ILT RY

Question 1

What is the pressurizer heat-up limit?

Answer 1

100F/hr

Question 2

What is the pressurizer cooldown limit?

Answer 2

200F/hr

Question 3

What is the differential temperature limit between RCS and PZR spray?

Answer 3

320F

Question 4

What is the capacity and lift setpoint of a PORV?

Answer 4

RY456 210,000 lbm/hr 2335 psig

RY455A 210,000 lbm/hr 2345 psig

Question 5

What is the capacity and lift setpoint of a pressurizer safety valve?

Answer 5

420,000 lbm/hr 2460 psig

Question 6

What is the program level band for the pressurizer and what is it controlled by?

Answer 6

Unit 1 25-60% 557-587F Tave
Unit 2 27-60% 557-581F Tave
Constant mass: Level is designed to vary with RCS temperature (using auctioneered 2nd highest Tave) with no mass addition or loss
Controlled by charging and letdown flows

Question 7

How many sets of pressurizer heaters are there?

Answer 7

4 sets,C proportional ABD backup

Question 8

What is the capacity of the pressurizer heaters?

Answer 8

Proportional C 400KW

Backup ABD 1400KW

Question 9

What are the power supplies for pressurizer heaters?

Answer 9

A&D 143

B&C 144

Question 10

What allows the PORVs to operate once air is isolated to containment?

Answer 10

They have their own accumulators and each accumulator will allow its associated PORV to cycle 50 times

Question 11

What are the pressurizer level setpoints?

Answer 11

92% PZR high level Rx trip 2/3
70% High level alarm
60% 100% program level
25/27% 0% power program level
17% PZR heaters de-energized
\+5% >Band backup heaters energize regardless of level
-5% low level alarm

Question 12

What is the hydrostatic test pressure for pressurizer?

Answer 12

3107 psig

Question 13

What is the safety limit for the pressurizer?

Answer 13

2735 psig

Question 14

When do pressurizer safety valves open?

Answer 14

2460 psig

Question 15

What is the high pressure reactor trip setpoint?

Answer 15

2385 psig

Question 16

When will PORV RY455A be full open?

Answer 16

2345 psig

Question 17

When will PORV RY 456 be full open?

Answer 17

2335 psig

Question 18

When are the PORVs closed?

Answer 18

2315 psig

Question 19

When do the pzr spray valves full open?

Answer 19

2310 psig

Question 20

When do the pzr spray valves full close?

Answer 20

2260 psig

Question 21

At what pressure do the pzr variable heaters turn off?

Answer 21

2250 psig

Question 22

What is the RCS normal operating pressure?

Answer 22

2235 psig

Question 23

What pressure do the backup heaters turn off?

Answer 23

2225 psig

Question 24

What happens at 2220 psig?

Answer 24

backup heaters on and variable heaters full on

Question 25

At what pressure are the PORVs enabled?

Answer 25

2185 psig

Question 26

What pressure does a P-11 occur?

Answer 26

1930 psig

Question 27

What pressure will a PZR pressure low reactor trip occur?

Answer 27

1885 psig

Question 28

What pressure will safety injection occur?

Answer 28

1829 psig

Question 29

What is the effect of the controlling pressurizer level channel failing high/low?

Answer 29

Ovation chooses the 2nd highest of the 3 level detectors | If a level detector fails hi/low ovation will sense it and average the functioning 2 signals and work normally

Question 30

Per TS 3.4.9 what is required to make the pressurizer operable?

Answer 30

level <= 92% | Two groups of heaters each >150KW and able to be powered by redundant ESF buses

Question 31

What is the effect of the controlling pressure channel failing high/low?

Answer 31

Ovation chooses the 2nd highest reading pressure detector as master, if a detector fails hi it is not the master.

Question 32

What is the safety design basis for the pressurizer?

Answer 32

OPSSS prevent Overpressurization PORVs required for LTOP protection when water solid Safety valves discharge to PRT Safety valves prevent exceeding 110% 2735 psig design pressure Safety valves combined capacity can accomodate turbine trip with no credit for reactor trip, rod control, PORVs, steam dumps, level control, sprays

Question 33

What is the operational design basis for the pressurizer?

Answer 33

Loading or unloading of 5%/min without reactor trip Step load changes of +-10% in 120 sec without reactor trip or uncovering heaters 50% step load reduction without Hi level Rx trip Complete loss of load without water relief through the Safety valves