NC0007064_Thermal Plume Data_20240410

Action History (UTC-05:00) Eastern Time (US & Canada)
Submit by Anonymous User 4/10/2024 1:09:04 PM (Supplemental Submittal)
Submit by bradley.bennett 7/10/2024 2:57:34 PM (Supplemental Info Submittal)
• The task was assigned to Wren.Thedford, bradley.bennett 4/10/2024 1:09:05 PM
• bradley.bennett assigned the task to bradley.bennett 7/10/2024 2:57:28 PM

Initial Review Information
...............................................
Updated ID#: * IMPORTANT: REVIEWER SHOULD VERIFY and revise here if necessary.
NC0007064
How should this project be handled? *
File Discard
Information Submitted on 4/10/2024
Submitter Information
Name: Eric Caison
Who is submitting the information?
Email Address:* [e-mail]
Submittal Information
The Division of Water Resources (DWR) is providing this site to allow for the upload of required supplemental information
associated with discharge monitoring reports (DMR). All DMR data is required to be submitted electronically through
the eDMR system and should not be submitted here. Division staff will review all uploaded documents and will only
maintain required information. Documents such as laboratory reports are not required to be submitted and will not be
maintained in the system.
Project Information:
Please supply the permit number for this project.
...............................................................................................................................
Existing ID#* Permit Number
NC0007064
Examples: NCxxxxxxx or NCGxxxxxx
Facility Name: * Brunswick Steam Electric Plant
County: Brunswick
Please upload all files that need to be submited. *
Click the upload button or drag and drop files here to attach document
3.14.2024 Thermal Plume Monitoring.pdf 520.82KB
Only pdf files are accepted.
Please provide descriptive comments about the attached information.
Semiannual thermal plume monitoring data for ocean discharge required by A.(1) Effluent Limitations and Monitoring
Requirements [Outfall 001] of Permit NC0007064.
* By checking the box and signing box below, I certify that:
o I have given true, accurate, and complete information on this form;

• I agree that submission of this Supplemental Information form is a "transaction" subject to Chapter 66, Article 40 of the
NC General Statutes (the "Uniform Electronic Transactions Act')
• I agree to conduct this transaction by electronic means pursuant to Chapter 66, Article 40 of the NC General Statutes
(the "Uniform Electronic Transactions Act');
• I understand that an electronic signature has the same legal effect and can be enforced in the same way as a written
signature; AND
• I intend to electronically sign and submit the Supplemental Information form."
Full Name: Donald Eric Caison
Signature:
Oew,? KC t« CJ1? f-W
Date Submitted: 04/10/2024

Brunswick Steam Electric Plant (BSEP) Supplemental Information for Thermal Plume:
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [Outfall 0011
[15A NCAC 0213.0400 et seq., 15A NCAC 02B.0500 et seq.]
Criteria:
TEMPERATURE —Cooling-water system facilities shall be effectively maintained and operated to. meet
the temperature standards assigned to the Atlantic Ocean: 0.8°C (1.447) increase above ambient water
temperature during the months June through.August; 2.2°C (3.96°F) increase above ambient water
temperature during the months September through. May. In no case should the temperature exceed
32°C (89.6°F) due to the discharge of heated liquid measured three (3) feet below the water surface
except within the following defined mixing zones:
(a). The temperature increase above ambient water temperature shall not exceed 7'F outside an area of
120 acres included within the plume extending from the point.of discharge.
(b). The temperature increase above ambient water temperature shall not exceed 0.8'C (1.447)
increase above ambient water temperature during the months of June through August; 2.2°C (3.967)
increase above ambient water temperature during the months of September through May. In no case
should the temperature exceed 32'C (89.67) outside an area of 2000 acres.
(c). The temperature increase above ambient water temperature at the bottom (defined as one foot
above the ocean floor) shall not exceed 7'F for more than 1000 feet from the point of discharge, nor for
an area of more than four (4) acres.
Temperature monitoring at the ocean discharge shall be conducted semiannually, once during the
months of April - November and once during the months of December - March. Reactor power levels
should be at least 85% for each unit on the date of monitoring. If it is determined by this Division that
the water quality standards or conditions of this permit are being violated or being threatened (within
9D% of the limitations or standards), additional monitoring may be required.
Temperature shall be monitored within a 2320-acre rectangular mixing zone defined by two (2) sampling
grids; one near the ocean surface (three feet below the water surface) and the second near the bottom
(one foot above the ocean floor). Temperatures shall be recorded at locations sufficient in number to
establish compliance with Water Quality Standards. The Permittee.shall likewise establish and report
ambient temperatures beyond each grid by averaging four (4) temperature measurements -- each
measurement to be taken approximately 1500 feet beyond a different mixing -zone corner on a baring
approximately 1352 relative to each sampling grid except for the corners closest to the shoreline which
are to be taken 1500 feet from the grid parallel to the shoreline.
Conclusion:
Monitoring was performed on 3/14/2024.
All measured parameters were within the guidance specified by the BSEP NPDES permit.
Temperature monitoring is performed .by plant procedure OE&RC-3227, Thermal Plume Monitoring.

Note:
Conditions at the time of monitoring were below the suggested Reactor power levels on Unit 1 due to
an emergent safety related shutdown and subsequent refuel outage. This impacted the original
schedule window to conduct the monitoring in February before the annual refuel typically scheduled in
March. At the time of monitoring, the unit was in startup at 20% (below the recommended 85% power
level). Recognizing that the unit would experience numerous power level. changes during the next week
during unit recovery in addition to accounting for the unpredictable marine conditions, the team
proceeded with the monitoring.
DAP
3/14/2024

THERMAL PLUME MONITORING OE&RC-3227
Rev. 6
Page 14 of 18
ATTACHMtN 1 4
a< BNP Thermal Plume Monitoring Log » Page 1 of 2
Date 3/14/2024 % Power
Wind Direction NW Unit 1 20.0
Wind Speed 5 MPH Unit 2 100.0
Air Temperature 64 Tide Stage Rising, High, Falling
Station
Time
Surface Temp
Bottom Temp.
1
N/A
N/A
N/A
2
11:02
58.9
58.3
3
11:01
58.9
N/A
4
10:59
59.0
N/A
5
10:58
59.3
N/A
6
10:56
59.8
N/A
7
10:55
59.6
N/A
8
10:53
59.5
N/A
9
10:51
59.5
N/A
10
10:50
59.5
N/A
11
10:48
59.5
N/A
12
10:45
59.7
58.0
13
N/A
N/A
N/A
14
10:43
59.7
N/A
15
11:22
60.2
N/A
16
11:20
60.9
N/A
17
11:18
60.2
N/A
18
11:17
60.5
N/A
19
11:15
60.3
N/A
20
11:13
60.1
N/A
21
11:12
60.2
N/A
22
11:10
59.9
N/A
23
11:08
60.1
N/A
24
11:06
60.1
N/A
25
11:37
60.6
N/A
26
11:36
60.8
N/A
27
11:34
61.0
N/A
28
11:33
61.0
N/A
29
11:32
61.2
N/A
30
11:30
61.7
N/A
31
11:29
60.2
N/A
32
11:27
59.9
N/A

THERMAL PLUME MONITORING OE&RC-3227
Rev. 6
Page 15 of 18
ct BNP Thermal Plume Monitoring Log a> Al IAUNM=N1g
Page 2 of 2
Station
Time
Surface Temp.
Bottom Temp.
33
11:26
60.0
N/A
34
11:24
60.3
N/A
35
10:40
59.7
N/A
36
N/A
N/A
N/A
37
10:36
59.7
58.9
38
10:34
59.8
N/A
39
10:33
60.3
N/A
40
10:31
60.3
N/A
41
10:30
61.4
N/A
42
10:28
62.2
N/A
43
9:49
59.7
N/A
44
9:47
60.1
N/A
45
9:45
59.5
N/A
46
9:44
59.5
N/A
47
9:41
59.6
59.8
48
N/A
N/A
N/A
49
10:01
N/A
59.1
50
10:00
N/A
58.5
51
10:04
N/A
58.2
52
9:58
N/A
58.1
53
9:55
N/A
59.3
54
10:18
N/A
58.6
55
10:14
N/A
58.0
56
9:53
N/A
60.1
57
10:22
63.2
N/A
58
10:19
61.5
N/A
59
10:15
59.5
N/A
60
9:52
62.7
N/A
61
10:09
69.1
63.8
Ambient Temperature: Surface: 59.5 Bottom:
Temperature Meter Serial Number: CP288734 Probe Serial Number:
Calibration Due Date: 1/24/2025
Data Collected by:
Wirth Wells, Ammon Babson, Kelli Davis
58.8
CP395923
Reviewed by: Drew A Petrusic, Environmental Field Support

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