ECCS

Home

Get App

Create

Core Spray ECCS initiation signals?
- 1.84#
- OR
- -47" and <= 420#
- -47" and >= 20 min
LPCI (RHR) ECCS initiation signals?
- 1.84#
- OR
- -47" and <= 420#
- -47" and >= 20 min
ADS (SRVs) ECCS initiation signals?

-47" and 100# and 107 seconds
HPCI ECCS initiation signals?
- -47"
- OR
- 1.84#
What are the Lo-Lo Set initiation and reset pressures?
- H = 1052#
- G = 1062#
- E = 1072#
They have a blowdown of 80psig
After Core Spray has an initiation signal and auto starts, how is flow throttled, if necessary?

After an auto start, flow is throttled with the INBOARD isolation, MO-1754 and MO-1753.
What are the power supplies to the Core Spray inboard isolations, MO-1753 and MO-1754?
- MO-1753 = MCC-133A
- MO-1754 = MCC-143A
What is the ECCS design criteria for PCT?

PCT < 2200 F
What is the ECCS design criteria for Max Clad Oxidation?

< 17% total thickness
What is the ECCS design criteria for H2 generation?

<1% max theoretical
What are all the ECCS design criteria?
- PCT < 2200F
- Max Clad Oxidation <17% total thickness
- H2 generation < 1% max theoretical
- Maintain coolable geometry
- Maintain long term cooling
What is the power supply to 11 and 12 Core Spray pumps?
- 11 CS = Bus 15
- 12 CS = Bus 16
Describe the interlock between the inboard and outboard Core Spray isolation valves.
- The inboard and outboard isolation valves are interlocked such that either valve may not be opened unless the other valve is fully closed.
- This is bypassed for the inboard when <420psig
What is the minimum required Core Spray pressure to remain Operable?

30psig
What Core Spray components operate on an ECCS initiation signal if RPV pressure is 650#?
- Core Spray pump will start after 15 sec
- Test Return Line will isolate (MO-1749 or MO-1750)
The injection isolations (MO-1751, 1752, 1753, 1754) will not receive an open signal until <420psig

Author

jasonstone808

99216

Card Set

ECCS

Description

Cert Class. ECCS signals and logic

Updated

2011-09-03T13:00:28Z

Show Answers