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ILT SRO > Precourse ILT RY > Flashcards

Precourse ILT RY Flashcards

1
Q

What is the pressurizer heat-up limit?

A

100F/hr

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2
Q

What is the pressurizer cooldown limit?

A

200F/hr

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3
Q

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

A

320F

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4
Q

What is the capacity and lift setpoint of a PORV?

A

RY456 210,000 lbm/hr 2335 psig

RY455A 210,000 lbm/hr 2345 psig

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5
Q

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

A

420,000 lbm/hr 2460 psig

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6
Q

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

A

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

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7
Q

How many sets of pressurizer heaters are there?

A

4 sets,C proportional ABD backup

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8
Q

What is the capacity of the pressurizer heaters?

A

Proportional C 400KW

Backup ABD 1400KW

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9
Q

What are the power supplies for pressurizer heaters?

A

A&D 143

B&C 144

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10
Q

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

A

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

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11
Q

What are the pressurizer level setpoints?

A 
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
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12
Q

What is the hydrostatic test pressure for pressurizer?

A

3107 psig

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13
Q

What is the safety limit for the pressurizer?

A

2735 psig

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14
Q

When do pressurizer safety valves open?

A

2460 psig

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15
Q

What is the high pressure reactor trip setpoint?

A

2385 psig

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16
Q

When will PORV RY455A be full open?

A

2345 psig

17
Q

When will PORV RY 456 be full open?

A

2335 psig

18
Q

When are the PORVs closed?

A

2315 psig

19
Q

When do the pzr spray valves full open?

A

2310 psig

20
Q

When do the pzr spray valves full close?

A

2260 psig

21
Q

At what pressure do the pzr variable heaters turn off?

A

2250 psig

22
Q

What is the RCS normal operating pressure?

A

2235 psig

23
Q

What pressure do the backup heaters turn off?

A

2225 psig

24
Q

What happens at 2220 psig?

A

backup heaters on and variable heaters full on

25
Q

At what pressure are the PORVs enabled?

A

2185 psig

26
Q

What pressure does a P-11 occur?

A

1930 psig

27
Q

What pressure will a PZR pressure low reactor trip occur?

A

1885 psig

28
Q

What pressure will safety injection occur?

A

1829 psig

29
Q

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

A

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

30
Q

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

A

level <= 92%

Two groups of heaters each >150KW and able to be powered by redundant ESF buses

31
Q

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

A

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

32
Q

What is the safety design basis for the pressurizer?

A

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

33
Q

What is the operational design basis for the pressurizer?

A

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

ILT SRO (20 decks)

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