Three Mile Island · Unit 2 · Control RoomMiddletown, Pennsylvania · 28 March 1979
This simulation works best on a laptop or larger screen.
STATION TIME04:00:37
SINCE TRIPT+00:00
PRESSURE2155
PZR LEVEL220
CORE °F580
TAILPIPE °F190
Alarm printer: current

Reactor coolant

RCS pressure
2155 psig
Pressurizer level
4000
220 in
Core exit temp
580 °F
PORV tailpipe
190 °F
Drain tank press
3 psig
Containment
0.1 psig
Steam gen level
A 30 / B 30 in
Bldg radiation
low
Engineer on the phone

Controls

PORV (RC-RV2) indication
OPEN
CLOSED
Lamp shows the signal sent to the valve.
PORV block valve (RC-V2)
OPEN
CLOSED
High pressure injection 0%
MU-P1A
MU-P1C
Emergency feedwater
PUMPS
V12A SHUT
V12B SHUT
V12 OPEN
Reactor coolant pumps
RODS IN
👆
Control-room simulation · about 5 minutes

Three Mile Island, 1979

4:00 a.m. Alarms are going off. Keep water over the reactor core.

A simplified model of the real accident sequence. Instruments and alarms are modeled on the 1979 control room, not reproduced exactly.