Nuclear cooling water

what powers NC pumps

NB

NC pump auto start indications?

what else can bring in the indication ?

what will auto start the pump?

starts on 79 psig

Amber light indication

can only auto start a green flagged pump

amber light also from local start on breaker

purpose of NC v99

NC V99 is the supply to non priority loads and is closed when crosstieing EW

NC containment Isolation valves auto actuation

Close on CSAS (containment pressure of 8.5PSIG)

NC containment relief valves

one 6 in valve set at 135 PSIG for High pressure seal leakage

one set at 150 PSIG between both outlet valves due to trapped water during a CSAS. prevents overpressure during temp rise in containment. protects against water solid system

both vent to containment

Surge tank lvl control and makeup

NC has no BYPASS valve and is made up form DW

can be made up from the Cooling water holdup tank

NC RU 6 goes off, what are the likely leaked in systems? what does it detect and where is it?

RCP seals and CVCS letdown HX

detects gamma

located out in the North yard by NC pumps

Bonus relief valve on inlet to RCP

relieves at 110PSIG. in case the outlet to the RCP HX is isolated

What RU monitors will monitor NC when cross tied to EW. status of RU-6

RU-2 train A

RU-3 train B

RU-6 is isolated

what are the NC priority loads?

RCP seals

CEDM ACUS

Nuclear sample coolers

Normal chiller

what is the normal discharge pressure on the NC system

about 90 to 100 PSIG

what is the sequence for opening the containment inlet valves when restoring?

why?

open the outlet, the middle, then the inlet to prevent spiking pressure and creating a leak in containment

what is the sequence for opening containment isolation valves when containment temp is high

inlet, middle, and outlet to prevent water hammer

How much flow is sent to the normal chillers A, B, and C

2500 GPM per chiller (500gpm to E)

How much flow is sent to the CEDM ACU

400 GPM

How much flow is sent to the RCP’s

511 GPM

how much flow is sent to the Nuclear sample coolers

16-26 gpm each

How much flow is sent to the PC HX

2500 GPM

How much flow is sent to the Letdown HX

1500 gpm

How can we cross connect EW to NC? what loads can be cooled by EW? what limitations exist

When EW is cross tied by isolating non priority loads using NC V 99. then EW is aligned to the Priority loads

It can also be aligned to the PC HX (Non priority)

A train from the control room, B from the field

Cross tie will inop the train of EW