Safety Injection (SI)

Question 1

State the minimum flow required for operation, min. flow for continuous operation, shutoff head, and rumble region of the Safety Injection Pumps

Answer 1

HPSI: 85, 225, 1776-1962
LPSI: 100, 2400, 210#, 2500-3500
CS: 150, 2100, 290#, 1800-2800

Question 2

Describe the SDC Train A/B Low Flow alarm

Answer 2

alarm is tied to breaker, if pump trips, no audible?

Question 3

State the SI design criteria

Answer 3

CLOTH

Coolable Geometry
Long term cooling
oxidation less than 17%
temperature of the cladding less than 2200F
hydrogen production less than 1%

Question 4

State the Containment Spray design criteria

Answer 4

reduce peak Containment pressure 50% within 24 hours

Question 5

Does CHA-HV-532 RWT to Train A SI Pumps Suction reposition on a RAS?

Answer 5

No, manual action required.
SIA-UV-664 Ctmt Spray Pump A Recirc Valve will close

Question 6

What is the purpose of the Trisodium Phosphate baskets?

Answer 6

raise pH (greater than 7.0) to ensure iodine stays in solution

Question 7

Which RCS loops do HPSI’s feed?

Answer 7

HPSI flow goes to one hot leg and all four cold legs

Question 8

Is Shutdown cooling warmup line flow read by the LPSI loop flow transmitters?

Answer 8

Yes, however, the flow does not go to the RCS

Question 9

What is the open permissive for the SDC Suction valves (651-656)?

Answer 9

• Open permissive: ≤ 385 psia RCS pressure

Question 10

What is the close permissive for the SIT outlet valve?

Answer 10

• Outlet MOVs
  o Auto open: SIAS OR PZR press > 410 psia
  o Close permissive: PZR press ≤ 405 psia and no SIAS

Question 11

What is the minimum flow that can be read for a HPSI?

Answer 11

All Foxboro flow indicators go off-scale at approximately 8 to 10% due to limitations with
the square root extractors. The HPSI flow indicators, for example, will not read accurately below 75 gpm.