NOPS Exam 1

Question 1

When must LTOPs be enabled?

Answer 1

Tave < 350 degF

Question 2

When LTOPs are enabled, what must be the configuration of ECCS pumps? What is the exception?

Answer 2

No more than one CV pump capable of injecting. No SI pump capable of injecting. The exception is that all CV and SI pumps can be capable of injecting if all RCS cold legs are >330 degF

Question 3

When making the pressurizer solid, what is the maximum difference in CH and LD flows that is allowed and what is the reasoning behind this?

Answer 3

25 gpm. This ensures that the bubble doesn’t collapse too rapidly and thermal stresses are reduced on the pressurizer

Question 4

At what point in the cooldown will CV131 start controlling RCS pressure?

Answer 4

When the PZR spray and aux spray valves are no longer able to control pressurizer pressure

Question 5

During performance of BwGP 100-5 RCS cooldown, when must SDM be monitored and at what frequency? What TS is the driver for this action?

Answer 5

Per TS 3.1.1, Mode 2 with Keff < 1.0. Mode 3, Mode 4, Mode 5. Verify SDM within limits of the COLR once every 24 hours

Question 6

When the RCS is solid, above what RCS temperature must there be at least one RCP running?

Answer 6

160 degF

Question 7

Which pressure sensors input into the “ARM LOW TEMP” mode of RY456 and RY455A? What are the temperature inputs into “ARM LOW TEMP”?

Answer 7

For RY456, the pressure is sensed from PT-406 off the ‘A’ RH suction piping from the ‘A’ hot leg and the temperature is from the auctioneered low W/R cold leg temperature. For RY455A the pressure is sensed from PT-407 off the ‘B’ RH suction line from the ‘C’ hot leg and the temperature is from the auctioneered low W/R hot leg temperature

Question 8

When an RCP is stopped, below what RCS temperature can CC to the RCP thermal barriers be isolated?

Answer 8

180 degF

Question 9

What are the CC temperature limits when RH is initially placed in service? What condition allows this limit to be raised and to what temperature?

Answer 9

120 degF for 3 hours. It may be raised to 128 degF for 3 hours if either unit is in a LOCA or in post-LOCA cooldown

Question 10

On a down power, how soon after entering Mode 3 can the SI accumulators be isolated? Why is there a delay?

Answer 10

2.5 hours after entry into Mode 3. This ensures that peak cladding temperature doesn’t exceed 2200 degF during a large break LOCA

Question 11

Per BwGP 100-5, at what pressure in the RCS must the SI accumulators be isolated during a downpower?

Answer 11

<800 psig

Question 12

Per TS 3.5.1, at what RCS pressure must the SI accumulators be placed in service?

Answer 12

When RCS pressure is >1000 psig

Question 13

What is the relationship between RCP operation and boration?

Answer 13

At least one RCP should be running to ensure adequate mixing

Question 14

If an emergency boration is needed on unit 1, how many gallons from the BAT are needed for each stuck out rod?

Answer 14

1320 gallons

Question 15

If an emergency boration is needed on unit 1, how many gallons from the RWST are needed for each stuck out rod?

Answer 15

5500 gallons

Question 16

If an emergency boration is needed on unit 2, how many gallons from the BAT are needed for each stuck out rod?

Answer 16

1200 gallons

Question 17

If an emergency boration is needed on unit 2, how many gallons from the RWST are needed for each stuck out rod?

Answer 17

5000 gallons

Question 18

When does a P-7 come in and what trips are active when it comes in?

Answer 18

A P-7 comes in when either 2/4 PR above 10% or 1/2 Pimp above 10%. When above P-7 the following Rx trips are active: 2-loop loss of flow, 2/4: RCP breaker open, RCP UV, RCP UF, Pzr level high 92% 2/3, Pzr pressure low 1885 psig 2/4

Question 19

What directions must be given to chemistry and RP when Rx power has been changed 15% or more within one hour?

Answer 19

Chemistry must sample RCS for Iodine concerns. RP must analyze containment air and aux building vent stack samples

Question 20

Below what RCS pressure and temperature can RH be placed in service?

Answer 20

<360 psig due to the interlock with the suction valve and <350 degF because that is when we enter Mode 4

Question 21

What are the energize to actuate SSPS signals?

Answer 21

P-6, P-11, RWST Lo-2, Hi-3 containment pressure

Question 22

When does a P-6 come in?

Answer 22

1/2 IRNI > E-10 amps

Question 23

When does a P-11 come in?

Answer 23

2/3 pressurizer channels <1930 psig

Question 24

When does RWST Lo-2 come in?

Answer 24

46.7% 2/4

Question 25

When does Hi-3 containment come in?

Answer 25

20.0 psig on 2/4 PT including PT-937

Question 26

What is the maximum differential temperature allowed on the pressurizer spray nozzle and what document is this limit driven from?

Answer 26

320 degF and this is per TLCO 3.4.c (applicable at all times)

Question 27

If calculated feed water flow is higher than, is reactor power being maintained conservatively? How?

Answer 27

Yes because mass flow rate in the S/G is lower than we think so that means the heat transfer rate is also lower than we think therefore the reactor is operating at a lower power

Question 28

How does a GCB and its associated disconnects fail on low SF6 gas pressure?

Answer 28

The GCB will go open with whatever little gas pressure it has left and is blocked from closing in again. The motor operated disconnects will open

Question 29

What term is defined as “a temporary alteration made to a
system, structure, or component that does not conform to the approved design
configuration”?

Answer 29

TCC Temporary Configuration Change