3.5 ECCS

Question 1

3.5.1

Answer 1

SITs - Operating
4 SITs Operable
Modes 1-2 and 3-4 >/= 1837 psia

Question 2

What does an operable SIT mean?

Answer 2

Pressure 600 psig - 625 psig
2300-4400 ppm boron
Motor operated isolation valve fully open, power removed
Volume of 28%-72% NR or 1802-1914 cubic feet of borated water

Question 3

3.5.2

Answer 3

SITs shutdown
4 SITs operable with volume 39% WR - 83% WR
OR
3 SITs operable with volume 60% WR - 83%WR
Modes 3-4 (>/= 1837 psia)

Question 4

3.5.3

Answer 4

ECCS - Operating
Two trains Operable
Modes 1-2 and 3 w/ Ppzr >/= 1837psia and Tc >/= 485F

Question 5

What makes up an ECCS train in Modes 1-3?

Answer 5

HPSI subsystem and LPSI subsystem

Question 6

3.5.4

Answer 6

ECCS - Shutdown
One HPSI train operable
Mode 3 less than 1837 and 485F
Mode 4

Question 7

3.5.5

Answer 7

RWT shall be operable
Modes 1-4
Must meet level requirements 
Boron concentration of 4000-4400 ppm
Tank not isolated
Temp between 60F and 120F

Question 8

What is RWT level requirement dependent on?

Answer 8

RCS Temperature. There’s a table in the Tech Spec Basis.

Question 9

3.5.6

Answer 9

TSP baskets have 524 cubic ft of active TSP

Modes 1-3