DOE/ORO/2327 Oak Ridge Reservation Annual Site Environmental ...

5-50 Oak Ridge National Laboratory
Stream reach assessed
(discharge outfall/cooling system)
Table 5.20. Measurements of instream temperature change for stream reaches
receiving cooling tower blowdown at ORNL
Monitoring date: August 17, 2009
Temperature change over length
of stream reach
(upstream to downstream of cooling system)
Round 1
(deg C)
Round 2
(deg C)
Round 3
(deg C)
Round 4
(deg C)
Rate of temperature change at downstream
end of stream reach between
rounds of sampling
Round 1 to
Round 2
(deg C/hour)
Round 2 to
Round 3
(deg C/hour)
OF 014/ 4510&4521 Cooling System 0.0 0.1 0.0 0.1 0.5 0.2 0.5
OF 227/ 5600 Cooling System –0.1 0.0 2.0 0.6 0.1 1.3 –0.9
OF 281/ 7902 Cooling System 2.2 2.0 2.3 2.2 0.2 0.5 0.3
OF 314/ 6001 Cooling System 2.7 2.0 1.8 1.4 –0.1 0.1 0.3
OF 363/ 5300 Cooling System 0.1 0.5 0.4 0.2 0.4 0.2 0.0
OF 435/ 8913 Cooling System 0.3 0.6 0.6 0.5 0.3 0.5 0.5
Round 3 to
Round 4
(deg C/hour)
Oak Ridge Reservation