Pzr, Press & Lvl

Question 1

Safety limit

Safety lift set point

PORV lift set point

PORV close interlock

Answer 1

2735 psig

2485 psig

2335 psig

2185 psig

Question 2

Hi Press. Rx Trip

Lo Press Rx Trip

P-11

Lo Press SI

Answer 2

2385 psig

1950 psig

1915 psig

1850 psig

Question 3

Spray full open/ hi Press alarm

Spray start open

Prop htrs full off

NOP (prop htrs 50% on)

Prop htrs full on

B/U htrs on

Answer 3

2310 psig

2260 psig

2250 psig

2235 psig

2220 psig

2210 psig

Question 4

LTOP permissives before cutin will work on PORV

PCV455 C

Answer 4

RCS cL loop 3 (TE-433b) < 283 deg

RCS hL loop 4 (PT-403A) > 435 psig

Question 5

Which PORV’s have emergency close feature from HSDP?

Answer 5

All of them

Question 6

Which PORV’s are class 1?

What features do these have only?

Answer 6

PCV-455c and 456

LTOP cut in, N2 back up, controlled by own channel

Question 7

What PORV not class 1?

How is this PORV different?

Answer 7

PCV-474

No LTOP, no N2 b/u, controlling channel is second highest via Press controller 455k

Can open by running demand up manually on 455k

Question 8

Describe Lpzr Control bands?

What happens at +/- 5% Lpzr from program?

What happens at Lpzr < 17%

Answer 8

Lpzr ramped from 22-60 % from

0-100% based on auctioneered hi Tave (547-577)

+ 5% = alarm, b/u htrs on

• 5% = alarm

< 17% letdown isolation (oriface vlves, 459/460)

Question 9

Describe Pzr htrs include power supplies?

Answer 9

1 - proportional htrs, p.s. 13D
2 - b/u p.s. 13D (1G)
3 - b/u p.s. 13E (1H)
4 - b/u p.s. 13E

Question 10

What Pzr htrs are able to powered at HSDP?

What interlocks are still active from HSDP?

Answer 10

Htrs 2 & 4

All interlocks disabled excepted for Lpzr < 17% trip

Question 11

Auto trips on Pzr htrs

Answer 11

All off
Lpzr < 17%

Prop
SCR cabinet low cooling flow
Over current

Question 12

Describe b/u htrs when power from vital b/u?

Answer 12

Indicating lights not on (de-energized on swap)
No interlocks work (off on SI, load shed)
Use kw amps for indication

1G
1H

Question 13

Describe htrs on loss of non-vital power?

Answer 13

• loss of heaters, non-vital p.s.

- indicating lights still indicate bkr closed(D.C. Control power) false indication

Question 14

What valve is primarily controlled by Lpzr Control?

What other inputs feed into this valve?

Answer 14

FCV-128

FE-128 inputs a feedback signal, so Lpzr cntrl sends a demand and the flow instrument lets valve know how he is doing

Question 15

What happens if FT-128 fails high?

Answer 15

FCV will close because it thinks flow is too high

• lose seal injection
• actual Lpzr will go down