DCL-2024-507, 2023 Annual Report on Discharge Self-Monitoring
| ML24079A136 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/27/2024 |
| From: | Rebel T Pacific Gas & Electric Co |
| To: | Office of Nuclear Reactor Regulation, State of CA, Water Resources Control Board |
| References | |
| DCL-2024-507 | |
| Download: ML24079A136 (1) | |
Text
Pacific Gas and Electric Company*
PG&E Letter DCL-2024-507 February 27, 2024 California Regional Water Quality Control Board Central Coast Region Attn: Monitoring and Reporting Review Section 895 Aerovista, Suite #101 San Luis Obispo, CA 93401-7906 Electronic Submission CIWQS Web Application Diablo Canyon Power Plant P.O. Box 56 Avila Beach, CA 93424 In accordance with Order 90-09, NPDES No. CA0003751, the 2023 Annual Report on Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP) is provided. This letter, accompanying overview, and annual data summary tables and plots, have been attached to the California Integrated Water Quality System (CIWQS) web application data submittal for the period. Annual Discharge Monitoring DMR Forms are additionally incorporated in the CIWQS submittal (Summary DMR).
Facility Name:
Address:
Contact Person:
Job
Title:
Phone Number:
WDR/NPDES Order Number:
Type of Report: ( check one)
Quarter: (check one):
Year:
Violation(s) (Place an X by the appropriate choice):
Diab lo Canyon Power Plant P.O. Box 56 Avila Beach, CA 93424 Trevor Rebel Manager, Environmental Operations (805) 441-5435 Order No. 90-09, NPDES No. CA0003751 QUARTERLY ANNUAL 00 2023 (Annual Reports for DCPP are Jan-Dec) 00 No (there are no violations to report)
Yes Internal
PG&E Letter DCL-2024-507 CRWQCB Central Coast Region February 27, 2024 Page 2 If Yes is marked (complete a-g):
a) Parameter(s) in Violation:
b) Section(s) of WDR/NPDES Violated:
c) Reported Value(s) d) WDR/NPDES Limit/Condition:
e) Dates of Violation(s)
(reference page of report/data sheet):
f) Explanation of Cause(s):
(attach additional information as needed) g) Corrective Action(s):
(attach additional information as needed)
(If "YES", see overview section of attached report)
(If "YES", see overview section of attached report)
(If "YES", see overview section of attached report)
PG&E Letter DCL-2024-507 CRWQCB Central Coast Region February 27, 2024 Page 3 I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. The results of the influent and effluent monitoring presented are the observed results of the measurements and analyses required by the monitoring program and is neither an assertion of the adequacy of any instrument reading or analytical result, nor an endorsement of the appropriateness of any analytical or measurement procedure. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.
If you have any questions or concerns, or require additional information, please contact Trevor Rebel at (805) 441-5435 Sincerely, Name:
Trevor Rebel
Title:
Manager, Environmental Operations - Diab/a Canyon Power Plant 2024507 /srp/tdr
PG&E Letter DCL-2024-507 CRWQCB Central Coast Region February 27, 2024 Page 4 cc:
Hardcopy Print-Out of CIWQS Application Submittal:
Mahdi Hayes NRC Senior Resident Inspector U.S. Nuclear Regulatory Commission Diablo Canyon Power Plant 104/5 Regional Administrator Licensing Assistant, Operations Branch U.S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001
PG&E Letter DCL-2024-507 CRWQCB Central Coast Region February 27, 2024 Page 5 bee:
PDF Formatted Copy of CIWQS Application Submittal:
RMS-DCPP (DCPP 119/1 eDocs Client)
S:\\enveng\\correspondence\\outgoing\\2024docs\\2024 complete\\
DCL2024507 NPDES 2023 Annual Discharge Monitoring Report.pdf S:\\enveng\\correspondence\\outgoing\\2024 docs\\2024 complete\\DCL2024507.doc Note: The tables and plots for this report are found on:
s:\\chem\\npdes submittals\\2023submittals\\2023 annual requirements\\
annual tables & plots.xis
CIWQS Web Application Submittal Print Out and Attached Supporting Documents
CIWQS Web Application State DMR Forms (eDMR)
Incorporated with Annual CIWQS eSMR Report Submittal
Annual Discharge Monitoring Report APPENDIX 3 (Attachment 4 to 2023Annual SMR)
SUMMARY
OF RWMP MONITORING FOR 2023 RWMP 1st Survey 2nd Survey 3rd Survey Study Stations/
Completion Completion Completion Surveys Stations/
Stations/
Stations/
per Year Dates Dates Dates Horizontal Band Transects 14 / 4x Mar20 Jun 16 Sep 27 Vertical Band Transects 5 / 4x Feb 17 Jun 09 Aug 30 Benthic Stations 8 I 4x Apr28 Jul 29 Auq 17 Fish Observation Transects 12 / 4x Apr 21 Jun 13 Jul20 Bull Kelp Census
- /1x n/a n/a n/a Temperature Monitorinq 24 / **
Jan-Mar Apr-Jun Jul-Sep Diablo Cove census.
4th Survey Completion Stations/
Dates Dec27 Jan 06,2024 Feb 15,2024 Dec 14 Oct 26 Oct-Dec Temperature measured throughout the year at 20-minute intervals (14 intertidal and 10 subtidal stations).
1.20 1.00 0.80 0.60 0.40 0.20 0.00 JAN FEB 2023 Annual Summary Report on Discharge Monitoring at the MAR Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY
( 6-Month Median)
APR MAY JUN JUL 2023 Page 22 o/22 Jnternal AUG SEP Chronic Bioassay Results
- 6-mo. Median Acute Limit
......... Acute Bioassay Results Acute 6-month Median OCT NOV DEC
16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 16 14 12 10 8
6 4
2 0
16 14 12 10 8
6 4
2 0
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY OIL & GREASE (A ven,ge, mg/1)
JAN FEB MAR APR MAY JUN JUL AUG SEP 2023 Note: Values plotted at zero were below the detection limit. Less than values are plotted at the value.
QUARTERLY OIL & GREASE (Avenge, mg/1)
JAN FEB MAR APR MAY JUN JUL 2023 Note: Values plotted at zero were below the detection limit.
QUARTERLY OIL & GREASE (Avenge, mg/1)
All values were 0 JAN FEB MAR APR MAY JUN JUL 2023 Note: Values plotted at zero were below the detection limit.
Page 21 o/22 lnternal AUG SEP AUG SEP OOID 0010
-oom Moodily AYUli< Limit OCT NOV DEC oou OOIL
-OOIM Moodily AYUli< Limit OCT NOV DEC OOIP 002
-003 004 Momllly AYUli< Limit OCT NOV DEC
35 25 20 15 10 5
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/1)
Mondlly A-Limit
-oou
--+--OOIL OOIM 0.1.-=:::::::::::::::::::::=:=-------------------
411---
a--...... ::::::::::::::::..~
- ....,_:::::::::::~
JAN 35 FEB MAR APR MAY JUN JUL AUG 2023 Note: Points oo chart may overlap, Values plotted at zero were below the detection limit.
MONTHLY TOTAL SUSPENDED SOLIDS (Ave~, mg//)
SEP OCT NOV DEC Molllbly A....,. Limit (OOIP & 002)
-OOIP
--+--002
-003 30 -----------
25 20 15._ ___
10 5
0 JAN FEB MAR APR MAY JUN JUL AUG 2023 Note I: Points on chart may overlap. Values plotted at zero were below the detection limit.
Note 2: Monthly average limit only applies to 00IP and 002. 003 has no monthly average limit.
Page 20of22 lnterm;il SEP OCT NOV DEC
25 20 15 5
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE OOlL Quarterly Metals (ug/1)
All values were 0 Mercury Nickel Lead Zinc 0 +----+----+---
-+-----+-----+----1-----1-----1--------,1--------,1---
,------1 35 JAN FEB MAR APR MAY JUN JUL AUG 2023 ote: The analyte was not detected at or above the detection limit fo r values plotted at zero.
MONTHLY TOT AL SUSPENDED SOLIDS (A ven,gi:,, mg/1)
SEP OCT NOV DEC 30 -----------
25 20 15 10 5
-Mlllllllly A-Limit
-OOID
-0010
-OOIH 0 -.=:::::::....--------------------=======::::==:::::...-------------.;_-
e JAN FEB MAR APR MAY JUN JUL AUG 2023 Note: Points on chart may overlap. Values plotted at zero were below the detection limit.
Page 19 o/22 Internal SEP OCT NOV DEC
50 45 40 35 30 25 20 15 10 5
0 25 20 15 5
JAN FEB 2023 Annual Summary Report on Discharge Monitoring at the MAR APR Diablo Canyon Power Plant DISCHARGE 001H Quara:rly Metals (ugll)
MAY JUN 2023 JUL AUG Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE OOlL Quarterly Metals (ug/J)
All values were 0 SEP OCT NOV Mercury Nickel Lead Zinc DEC Silver Cadmium Chromium Copper 0 +----+----+----+----+----1-----1--------<~------<-------<-------<-----+---------1 JAN FEB MAR APR MAY JUN JUL AUG 2023 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 18 o/22 lnternal SEP OCT NOV DEC
180 160 140 120 100 80 60 40 20 0
120 100 80 60 40 20 0
JAN FEB MAR 2023 Annual Summary Report on Discharge Monitoring at the APR Diablo Canyon Power Plant DISCHARGE OOlF Quarterly M~ (ug/1)
MAY JUN JUL 2023 AUG SEP Note: The analyte was not detected at or above the detection limit for values plotted at zero.
JAN FEB MAR APR DISCHARGE 001H Quarterly M~ {ug/1)
MAY JUN 2023 JUL AUG Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 17 o/22 Jnternal SEP OCT OCT CMen:ury Nickel Lead Zinc NOV DEC CSilver Cadmium Chromium Copper NOV DEC
300 250 200 150 100 50 0
140 120 100 80 60 40 20 JAN FEB 2023 Annual Summary Report on Discharge Monitoring at the MAR APR Diablo Canyon Power Plant DISCHARGE 001D Quanerly Metlls (ug/1)
MAY JUN JUL 2023 AUG SEP Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE OOlF Quanerly Metlls (ug/1) 0 +------+----+----+----'---+----+----1----+---+------I'----
JAN FEB MAR APR MAY JUN JUL AUG 2023 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 16 o/22 lnternal SEP OCT OCT NOV Nickel Lead Zinc Mcn:ury DEC Silver Cadmium Chromium Copper NOV DEC
3.5 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001N Settleabk: Solids (mill) 3----------------- - --- - ---- -------------- ---- - --- - ----
2.5 2
1.5 Daily Mnimmn Limit
--0-- Moolhly A-Limit
-Daily Mnimmn
-Avcrqe 1 o----*<>-----<>----<:>------<>-----<D----<>-----<>----<J-----<~-----<"~----<lJ 0.5 o~==~===~==~t===~==:::::::tit:::::==*==~~==*====::jllt===~==~
JAN FEB MAR APR JAN FEB MAR APR MAY JUN JUL 2023 DISCHARGE 001D Quarterly Metlls (ug/1)
MAY JUN JUL 2023 AUG AUG Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 15 of22 lnternal SEP OCT SEP OCT NOV CSilvcr Cadmium Chromium Copper NOV DEC DEC
25 10 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001N Oil & Grcast: (mg/1)
Daily Maximum Limit
- Mondlly A....,. Lim
-DailyMuimmn
-A-Analytical Rq,ortioJ Limit o E =~C ---1---=!=====!:=====!:====::!::====:!:=====!:===~~==~ ~=-..
JAN 70 FEB MAR APR MAY JUN JUL AUG 2023 Note: Daily maximum and monthly average values overlap at several points on this plot.
DISCHARGE 001N Suspt:11ded Solids (mg/1)
SEP OCT NOV DEC Manthly A....,. Limt
-DailyMuinmn 60 ----------------------------------- --------------- -----
50 4-0 30 20 10 b===t:====::t:====::t=====t===~t::::==:=:::=...-~.,__- --:----
o +-----+-----------------+-----+-----------t-----t----------t JAN FEB MAR APR MAY JUN JUL AUG SEP 2023 ote: There is no limit for daily maximum values. The average values are below the monthly average limit.
Page 14 o/22 lnternal OCT NOV DEC
25.0 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE OOlF Oil&-Greast:
(Maximum, mg/1) 15.0 u----u-----u-----u------u-----<..:----------~---J----u----u-----u
-DailyMuimunLimit
-O--Moo1bly A-Limit 10.0
-Sa,q,Jcil<sult(Mulmum)
Analylial Rcponm, Limit 0.0 +------+-----+-----+----+-----+----==:,,,.,a....,,,=._---11-----+-----...,=-----+----------l JAN 120 80 60 40 20 FEB MAR APR MAY JUN JUL 2023 Note: Values plotted at zero were below the detection limit:
DISCHARGE OOlF Suspended Solids (Maximum, mg/1)
-DailyMmmmnl.imit
-o-- MOOlhly A-Limit
-Sa,q,Jc R<sult (Mulmum)
-Am1ytical Roponm, Limit 0 t=~~~~~~~~==~~~t=~=t~:::"""'::::t:::::~e::::::~=~t:~~
JAN FEB MAR APR Note: Maximum values are plotted.
MAY JUN 2023 Page 13 of22 lnternal JUL AUG SEP OCT NOV DEC
8.2 7.0 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant pH
-004
-OOIP 6.8 -t--------t-------1-----t-----t-------11-----t---
--t-----t------+------+-------1 JAN FEB MAR APR MAY Note: Several data points on this chart overlap.
3500 JUN JUL 2023 Discharge 001 Ammonia (as N, ug/1)
AUG SEP OCT NOV 3000 ------11.--------------11.--------------11.--------------1a-----
2500 2000 1500 1000 500 6-McalhM<diml.imit 0.,_ __ __,._ ___._ __
---111..... --..... ___....
JAN FEB MAR APR MAY JUN JUL AUG SEP 2023 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 12 o/22 lnternal OCT NOV DEC DEC
80 60 50 40 30 20 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Zinc (monthly average, ug/1)
-Dilcboqe PtmlitUmit AmlyticaJ R,poIUIJI Limit 10 --------------------------------------------------..
0---------------------..----------------------------------
JAN 12 8
6 4
2 FEB MAR APR MAY JUN JUL AUG 2023 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE 001 ChromilllD (monthly average, ug/1)
SEP OCT NOV DEC 0.,.. ___..,. ___ ~.----+-----11~---... ---... ---~.----+------11~---... ---....
JAN FEB MAR APR MAY JUN JUL AUG 2023 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
The 6-month median limit and the analytical reporting limit are the same (10 ug/1) and are plotted on this chart.
The daily maximum limit for chromium is 40 ug/1.
Note: Several data points on this chart overlap.
Page 11 o/22 Internal SEP OCT NOV DEC
12 8
6 4
2 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper (montbly average, ug/1}
Pmnit Limit ml Rq,onm, Limit 0------ ------------ ----------,------,----------- -----------,a------
35 25 20 5
JAN Jan FEB MAR APR MAY JUN JUL AUG 2023 ote: The analyte was not detected at or above the detection limit for values plotted at zero.
The 6-month median limit (the most conservative limit) is plotted on this chart (this is also the analytical reporting limit).
The daily maximum limit for Copper is 50 ug/1.
Feb Mar Apr DISCHARGE 001 Nickel (montbly average, ug/1}
May Jun Jul 2023 Aug Note: The analyte was not detected at or above the detection limit for values plotted at zero.
The 6-month median limit (the most conservative limit) is plotted on this chart.
The daily maximum limit for Nickel is 100 ug/1.
Note: Several data points on this chart overlap.
Page 10 o/22 lnternal SEP OCT NOV DEC
-DildmJePl:miitLimit Amlytica1 Rq,oninf Limit Sep Oct Nov Dec
250 200 150 100 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Total Chlorine Residual, ug/1 ok:::~~~=~§s=::=::==:==
JAN 700 600 500 400 300 200 100 FEB MAR APR MAY JUN JUL 2023 Note: Values plotted at zero were below the reporting limit.
DISCHARGE 001 Total Chlorine Used, JJOUI1ds per tbly AUG SEP OCT NOV DEC o..,='-----+-----==..
= ---+-----==,,,..---____.11'-----+----+----------... ---- -----e JAN FEB MAR APR MAY JUN 2023 Page 9 o/22 lnternal JUL AUG SEP OCT NOV DEC
3000 2500 2000 1500 1000 500 0
JAN FEB MAR 25 15 10 5
2023 Annual Summary Report on Discharge Monitoring at the APR Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flow(MGD)
MAY JUN JUL 2023 DISCHARGE 001 EFFLUENT Monthly De/fJI T ("F)
AUG SEP OCT Limit
_,._Hip
-Awn,e
-Li.mit
-Awn,e 0 +----+----+----+----+----+----+---- +-----+-----+-----+----i JAN FEB MAR APR MAY JUN JUL 2023 Page 8 o/22 lnternal AUG SEP OCT NOV DEC
90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Tcmpt:ratun: (
0 F) 0.0 +------l-----+-------+------+----+-----+----+-----+------,f------+------i 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV 2023 The Influent and Effluent "high" and "low" temperture values correspond to the highest and lowest daily average value for that month. The Influent high and low temperature does not necessarily correspond to the same day as the Effluent high and low temperature for that month. The "avg" temperature for Influent and Effluent is the average for the entire month.
The Monthly Delta T "high" is the highest Delta T for a day of the month based on daily average Influent and Effluent temperature values. The "avg" temperature is calculated from Influent and Effluent monthly avg values.
DISCHARGE 001 EFFLUENT Tcmpcratun: (
0F}
DEC 0.0 +------+----+------+-----+------+-----+------+-----+------+-----+------,
JAN FEB MAR APR MAY JUN 2023 Page 7 o/22 Jnternal JUL AUG SEP OCT NOV DEC
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING
.(toxicity units, tu. and tu<)
ACUTE Test 6-Month Month Result Median JAN FEB MAR 0.00 0.00 APR MAY 0.00 0.00 JUN JUL AUG 0.00 0.00 SEP OCT NOV 0.00 0.00 DEC 6-month median limit:
0.26 This parameter is monitored for the State Ocean Plan instead of the NPDES PermiL A value of 1.0 indicates no chronic toxicity.
Sludge Parameter Percent Moisture Total Kjeldahl Nitrogen Ammonia (N)
Nitrate(N)
Total Phosphorous pH Oil and Grease Boron Cadmium Copper Chromium Lead Nickel Mercury Zinc Volume DISCHARGE OOIN ANNUAL ANALYSES Result 98.9%
100000 mg/kg dry 17000 mg/kg dry ND(97) mg/kg dry 21000 mg/kg dry 6.9 s.u.
17 mg/L 90 mg/kg dry 1.0 mg/kg dry 320 mg/kg dry 5.6 mg/kg dry 4.6 mg/kg dry 7.7 mg/kg dry ND( 1.5) mg/kg dry 740 mg/kg dry 0.99 tons dry Note: Annual sam pies were collected in October.
- STLC = Soluble Threshold Limit Concentration Page6of22 Jnternal.
I0X STLC I0XSTLC l0X STLC J0X STLC J0X STLC IOXSTLC None
Month 0010*
00IG JAN ND(2)
ND(2)
FEB
<5 ND(2)
<5 ND(2)
APR
<5 ND(2)
MAY
<5 ND(2)
JUN
<5 ND(2)
JUL
<5 ND(2)
AUG
<5 ND(2)
<5 ND(2)
OCT
<5 ND(2)
NOV DNQ(2)
ND(2)
<5 ND(2)
Limit:
30 30 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS Averages (mg/I) 00IH 0011 00IJ 00IK 00lL ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
DNQ(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2)
ND(2) 16 ND(2)
ND(2)
ND(2)
ND(2) 30 30 30 30 30
- Discharges from 0010 are batched. Monthly averages are flow weighted.
Note: No discharges occurred from 0011 and 00I K during 2023.
Blank spots for other discharge points indicate that no discharge occurred during that particular month.
GREASE &OIL Averages by Month (mg/I)
Month 0010*
00IG 00IH 0011 00IJ 00IK 00lL JAN D Q(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
FEB MAR APR DNQ(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
MAY JUN JUL DNQ(i.8)
ND(l.4)
ND(l.4)
ND(l.4)
AUG SEP ND(l.4)
OCT ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
15 15 15 IS 15 15 15 00IM DNQ(2)
ND(2)
ND(2)
ND(2)
ND(2)
DNQ(3)
DNQ(2) 30 001M ND(l.4)
ND(l.4)
ND(l.4)
DNQ(i.4) 15
- Discharges from 001D are batched. Averages are flow-weighted and calculated monthly. Monthly averages are averaged for quarter and reported.
Note: No discharges occurred from 0011 and 00IK during 2023.
Pages o/22 Jnternal 00IP 002 003 ND(2)
DNQ(4) 13 ND(2)
ND(5) 15 ND(2)
DNQ(3) 19 15 DNQ(2)
DNQ(3) 6
<5 8
DNQ(2)
DNQ(2)
DNQ(2)
ND(2)
DNQ(3)
DNQ(2)
DNQ(2)
DNQ(3)
DNQ(2)
DNQ(3)
DNQ(3)
DNQ(2) 7 DNQ(2)
DNQ(2)
ND(2) 14 5
DNQ(2)
DNQ(4) 14 30 30 00IP 002 003 004 ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4)
ND(l.4) 15 IS 15 15
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 0010, H, L, F, METALS (avg. ug/1)
OOID OOIR Monlh Ag Cd Cr Cu Ag Cd Cr Cu Ag Cd JAN ND(0.39)
DNQ(0.24)
ND(2.6)
DNQ(4.4)
ND(5)
ND(5) 13 57 ND(5)
N D(5)
FEB MAR APR ND(0.39)
DNQ(0.15)
ND(2.6)
DNQ(4.5)
ND(5)
ND(5) 31 3 1 ND(5)
ND(5)
MAY J1JN JUL DNQ(0.75)
DNQ(0.14)
ND(2.6)
DNQ(3.6)
D(5)
D(5) 41 25 ND(5)
ND(5)
AUG SEP OCT ND(0.39)
DNQ(0.18)
ND(2.6)
DNQ{3.2)
ND(5)
D(5) 39 70 ND(5)
ND(5)
OY DEC limit: none Nole: 001 D, 001H and 001 L analyses performed on quarterly composites.
001 F analyses performed quarterly on a composite of weekly sam ples.
DISCHARGE 0010, H, L, F, METALS (avg. ug/1)
OOID OOJB Month Hg Ni Pb Zn Hg Ni Pb Zn Hg JAN ND(0.080)
DNQ(3.l)
DNQ(0.83) 83 ND(0.080) 16 0 (5) 17 ND(0.080) ND(5)
FEB MAR APR ND(0.080)
DNQ(3.9)
DNQ(0.96) 110 ND(0.080) 25 DNQ(5) 16 ND(0.080) ND(5)
MAY J UN JUL ND(0.080)
ND{l.8)
DNQ(0.79) 35 ND{0.080) 19 ND(5) 12 ND(0.080) ND(5)
AUG SEP OCT D(0.080)
ND(l.8)
DNQ{l.10) 44 ND(0.080) ov DEC limit: none Nole: 001 D, 001 H and OOIL analyses performed on quarterly composites.
001 F analyses performed quarterly on a composite of weekly samples.
25 D(5)
Page4 o/22 Jnternal 25 ND(0.080)
D(5)
OOJL OOlF Cr Cu Ag Cd Cr Cu ND(5)
ND(5)
ND(5)
ND(5)
ND(5)
DNQ(6)
ND(5)
ND(5)
ND(5)
ND(5)
DNQ(6) DNQ(7)
ND(5)
ND(5)
ND(5) 0 (5)
ND(5)
ND(5)
ND(5) 0 (5)
ND(5)
ND(5)
ND(5) 24 OOIL OOlF Pb Zn Hg Ni Pb Zn ND(5)
ND(5)
ND(0.080)
D Q(8)
ND(5) 43 ND(5)
ND(5)
ND(0.080)
DNQ(6)
DNQ(9) 28 ND(5)
ND(5)
ND(0.080)
ND(5)
ND(5) 13 ND(5)
ND(5)
ND(0.080)
ND(5)
ND(5) 95
Month JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC limit:
Discharge:
Month JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC high DNQ(2.I)
DNQ(2.1) 7.2 DNQ(l.S)
DNQ(I.S)
DNQ(l.S)
DNQ(l.S)
DNQ(I.S)
DNQ(l.5)
DNQ(l.5)
DNQ(l.5)
ND(J.5) 20 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MO THLY pH (averages) 001 002 003 004 Influent Effluent 7.7 7.7 7.8 7.8 7.8 7.8 7.9 7.8 7.8 7.7 7.6 7.7 7.7 7.8 7.8 7.5 7.6 7.5 7.6 7.7 7.6 7.6 7.6 7.6 7.6 7.5 7.6 7.4 7.5 7.7 7.6 7.6 7.4 7.2 7.3 7.5 7.5 7.6 7.6 7.6 7.6 7.7 7.7 7.7 7.6 7.8 7.7 7.8 7.6 7.6 7.6 7.8 7.9 7.9 7.9 8.0 8.0 7.9 7.9 7.9 Dischare:e 00IF SUSPENDED OIL & GREASE (mg/I)
SOLIDS (mg/I)
Month hi~h av~
hi h av~
JAN DNQ(2.9)
DNQ(2.9) 6N~C4l DNQ(4)
FEB DNQ(2.4)
DNQ(2.4)
DNQ(2)
DNQ(2)
MAR DNQ(l.4)
DNQ(l.4)
DNQ(2)
DNQ(2)
APR DNQ(l.S)
DNQ(l.S)
DNQ(2)
DNQ(2)
MAY DNQ(2.3)
DNQ(2.3)
DNQ(4)
DNQ(4)
JUN DNQ(2.2)
DNQ(2.2)
DNQ(4)
DNQ(4)
JUL ND(I.4)
ND(l.4)
ND(2)
ND(2)
AUG DNQ(l.4)
DNQ(l.4) 6 6
SEP 11.5 11.5 DNQ(3)
DNQ(3)
OCT ND(l.4)
ND(l.4) 7 7
NOV DNQ(l.8)
DNQ(I.8) 6 6
DEC DN!;l(2.0)
DN!;l!7.0)
DN!;!F!
DN!;l(2) limit:
20 IS 100 30 001P 7.5 7.6 7.5 7.3 7.6 7.3 7.5 7.2 7.5 7.5 7.5 7.7 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.
DISCHARGE 00IN (Monthly Summary of Weekly Data)
SUSPENDED SETTLEABLE GREASE & OIL (mg/I)
SOLIDS (mg/I)
SOLIDS(ml/l) low avg high low avg high low avg ND(I.S)
DNQ(l.S) 7 3
5 D Q(0.I)
DNQ(0.I)
DNQ(0.I)
D Q(l.5)
DNQ(l.5) 9 3
5 D Q(0.1)
D Q(0.1)
DNQ(0.I)
ND(l.S)
<S IO 5
7 DNQ(0.1)
DNQ(0.I)
DNQ(0.1)
ND(l.S)
DNQ(I.S) 8 4
5 DNQ(0.1)
DNQ(0.I)
DNQ(0.l)
ND(l.S)
DNQ(l.S) 10 4
7 DNQ(0.1)
DNQ(0.I)
DNQ(0. l)
ND(l.S)
DNQ(l.S) 13 6
9 DNQ(0.l)
DNQ(0.1)
DNQ(0.l)
ND(J.S)
DNQ(l.5) 11 ND(I) 6 DNQ(0.I)
DNQ(0.I)
DNQ(0.l)
ND(l.5)
DNQ(l.S) 25 4
IO DNQ(0.1)
DNQ(0.1)
DNQ(0.1)
ND(l.5)
D Q(I.5) 14 4
8 0.1 D Q(0.1)
<0.1 ND(l.5)
D Q(l.5) 36 7
19 DNQ(0.1)
D Q(0.1)
DNQ(0.1)
ND(l.5)
DNQ(l.5) 21 IO 14 DNQ(0.1)
DNQ(0.1)
DNQ(0.I)
NDO.5)
NDO.5) 13 4
8 DN!;l(0.l)
DN!;l(0.1)
DN!;l(0.I) 15 60 3.0 1.0 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.
Page3 o/22 lnternal
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ug/1)
CHROMIUM COPPER NICKEL Month Influent Effluent Influent Effluent Influent Effluent JAN ND(S)
ND(S)
ND(S)
ND(S) 13 14 FEB ND(S)
ND(S)
ND(S)
ND(S)
IS IS MAR ND(S)
ND(S)
ND(S)
ND(S) 17 17 APR ND(S) 10 ND(S)
ND(S) 10 ND(S)
MAY ND(S)
ND(S)
ND(S)
ND(S) 18 10 JUN ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
JUL ND(S)
ND(S)
ND(S)
ND(S) 14 15 AUG ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
SEP ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
OCT ND(S)
ND(S)
ND(S)
ND(S) 12 12 NOV ND(S)
ND(S)
ND(S)
ND(S) 10 DNQ(6)
DEC ND(S)
ND(S)
ND(S)
ND(S) 12 14 6-month median limit:
10 10 30 Note: Influent results presented only for comparison to effluent.
Influent Cr, Cu, Ni, are analyzed monthly, but are only required to be reported quarterly by permit.
Influent zinc is analyzed monthly and reported quarterly, but only required annually by permit.
DISCHARGE 001 VARIOUS ANNUAL ANALYSES (ug/1) 6--Mo.Med.
Parameter Arsenic Cadmium Cyanide Lead Mercury Silver Titanium
- Phenolic Compounds (non-chlorinated)
- Phenolic Compounds (chlorinated)
- PCB's Influent 1.29 0.G25 ND(20)
ND(0.020)
DNQ(0.00033)
ND(0.004)
ND(0.74)
ND(J.031)
ND(0.567)
ND(0.196)
Effluent 1.21 0.G25 ND(20)
ND(0.020)
DNQ(0.00049)
ND(0.004)
ND(0.74)
ND(3.031)
ND(0.567)
ND(0.196)
- Results for analysis of 8 target compounds. The sum of the 8 detection limits is 3.03.
,u Results for analysis of 6 target compounds. The sum of the 6 detection limits is 0.57.
Effluent Limit 30 10 30 10 0.2 2.9 none 150 10 none
- Detection limits shown are the sum of individual detection limits for 7 target compounds.
Month JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC DISCHARGE 001 AMMONIA (as N) (ug/1)
Influent ND(90)
DNQ(31)
ND(20) g:month median hm1t:
Page2of22 internal Effluent ND(90)
DNQ(33)
ND(20) 3,060
- zrNc Influent Effluent ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S)
ND(S) 70
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 TEMPERATURE (DEG F)
FLOW (MGD)
INFLUENT EFFLUENT DELTAT Month hi&h low avg high low avg high SVJia hi&h low avg JAN 58.0 53.7 55.8 77.5 72.2 75.3 20.0 19.4 2486 1536 2424 FEB 55.3 SI.I 53.0 74.9 68.9 72.6 20.1 19.5 2486 2486 2486 MAR 54.4 50.5 52.8 75.4 69.2 72.5 22.0 19.7 2486 1874 2344 APR 51.2 48.7 49.6 70.2 68.6 67.7 19.4 19.0 2486 2486 2486 MAY 53.9 48.9 52.4 73.6 68.7 71.4 19.8 19.0 2486 2486 2486 JUN 56.0 SO. I 53.4 76.3 70.7 73.4 20.7 20.0 2486 2486 2486 JUL 56.3 51.4 54.0 75.5 70.3 73.0 19.4 19.1 2486 2486 2486 AUG 60.6 52.0 57.0 80.6 71.3 76.7 20.1 19.7 2486 2486 2486 SEP 60.0 57.8 57.8 79.7 75.4 77.8 20.5 20.0 2486 2333 2481 OCT 60.2 55.0 57.0 80.1 64.5 75.9 20.2 18.9 1874 1252 1316 NOV 60.4 57.0 58.9 79.1 68.1 77.0 20.1 18.1 2486 772 1838 DEC 62.1 56.4 59.1 81.5 66.4 75.4 19.4 16.3 2486 1587 2447 limit:
22 2760 The lnfluent and Efflu ent "high" and "low" temperture values correspond to the highest and lowest daily average value fo r that month. The Influent high and low temperature does not necessarily correspond to the same day as the Effluent high and low temperature for that month. The "avg" temperature fo r lnfluent and Efflu ent is the average for the entire month. The Monthly Delta T "high" is the highest Delta T for a day of the month based on daily average Influent and Effluent temperature values. The "avg" temperature is calculated from Influent and Effluent monthly avg values.
DISCHARGE 001 TOTAL RESIDUAL TOTAL CHLORINE CHLORINE (daily max. ug/1)
USED (lbs/day)
Month high low avg high low avg JAN 65 0
51 446 0
352 FEB 197 25 52 335 42 217 MAR 89 0
41 31 7 0
226 APR 80 23 55 230 53 205 MAY 50 0
34 374 0
267 JUN 50 0
34 374 0
267 JUL 25 10 16 475 197 311 AUG 47 13 23 634 230 465 SEP 44 0
31 547 0
465 OCT 55 0
24 259 0
141 NOV 54 0
28 425 0
197 DEC 51 0
34 475 0
391 Note: The residual chlorine limits in Perm it CA0003751, Order 90-09, is an instantaneous max of 200 ug/1, and includes a time-based limit (per the Ocean Plan) which depends on the length of the respective chlorination cycle.
Page 1 o/22 Jnternal
Annual Discharge Monitoring Report APPENDIX 2 (Attachment 3 to 2023 Annual SMR)
TABULAR AND GRAPHICAL SUMMARIES OF INFLUENT AND EFFLUENT MONITORING
Annual Discharge Monitoring Report APPENDIX 1 (Attachment 2 to 2023 Annual SMR)
DIABLO CANYON POWER PLANT NPDES DISCHARGE POINTS DISCHARGE NUMBER DESCRIPTION 001 Once-Though Cooling Water 001 A Firewater Systems 001 B Auxiliary Salt Water Cooling System 001 C Discharge Deleted 001 D Liquid Radioactive Waste Treatment System 001 E Service Cooling Water System 001 F Turbine Building Sump 001 G Make-Up Water System Waste Effluent 001 H Condensate Demineralizer Regenerant 001 I Seawater Evaporator Slowdown 001 J Condensate Pumps Discharge Header Overboard 001 K Condenser Tube Sheet Leak Detection Dump Tank Overboard 001 L Steam Generator Slowdown 001 M Wastewater Holding and Treatment System 001 N Sanitary Wastewater Treatment System 001 P Seawater Reverse Osmosis System Slowdown 002 Intake Structure Building Floor Drains 003 Intake Screen Wash 004 Bio Lab and Storm Water Runoff 005,008,009, 013,014, 015 Yard Storm Drains 006,007, 010, 011,012 Storm Water Runoff 016 Bio Lab Seawater Supply Pump Valve Drain 017 Seawater Reverse Osmosis System Slowdown Drain
C. Sodium Bromide Treatment Program DCPP continued an integrated sodium bromide and "foul release coating" strategy to control macrofouling in the Circulating Water System (CWS). Both circulating water conduits of each Unit can be chemically treated simultaneously. Routine treatment consists of six 20-minute injections per day (at 4-hour intervals) of a blend of sodium bromide and sodium hypochlorite into the plant seawater intake conduits. Each injection attempts to achieve a target concentration range of 250 to 300 parts per billion (ppb) Total Residual Oxidant (TRO) at the inlet waterbox of the main steam condensers.
In conjunction with the chemical treatment program, untreated portions of the cooling water system were previously painted with a non-toxic "foul release coating" to reduce or prevent attachment of fouling organisms.
Discharge TRO, measured at the plant outfall, remained below NPDES limitations throughout 2023.
Typically, unit discharge TRO values during conduit treatments were between 20 ppb and 60 ppb.
6
- d. Discharge Bypass Events No discharge bypass events occurred during 2023.
- e.
Closed Cooling Water Releases During 2023, maintenance activities that required draining of closed cooling water systems were performed and are summarized below. PG&E received concurrence from the CCRWQCB in response to letters dated July 19, 1995 (PG&E Letter DCL-95-156), May 23, 1996 (PG&E Letter DCL-96-522),
and May 19, 1997 (PG&E Letter DCL-97-533) regarding the use of glutaraldehyde and isothiazolin to control microbiological growth and corrosion in DCPP's freshwater closed cooling water systems. Any drainage from these systems is discharged at a flow-rate such that the chronic toxicity level is below the "No Observable Effect Concentration" (NOEC) at NPDES Discharge 001.
The volumes of cooling water drained in 2023 from the intake cooling water (ICW), component cooling water (CCW), and service cooling water (SCW) systems are presented below. The glutaraldehyde (Glut) and isothiazoline (lso) concentrations presented in the table are system concentrations, not concentrations at the point of discharge to receiving water.
Other analysis as applicable included total suspended solids (TSS) and oil and grease (O&G).
Date System Volume Glut lso TSS O&G Reason &
(gallons)
(mg/I)
(mg/I)
(mg/I)
(mg/I)
Comments 01/19/23 Unit-2 sew 11,765 n/a
<0.250
<2.0
<1.4 Routine Maintenance 08/24/23 Unit-1 sew 117.2 n/a 1.780 n/a n/a Routine Maintenance 08/31 /23 Unit-2 eew 6800 n/a
<0.250
<2.0 n/a Routine Maintenance 09/22/23 Unit-1 sew 152 n/a 1.770 n/a n/a Routine Maintenance 10/04/23 Unit-1 sew 9,500 n/a 1.7
<2.0
<1.4 Routine Maintenance B. Monitoring of Receiving Water
- 1.
Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2023 under the Receiving Water Monitoring Program (RWMP) as requested in a letter from the Central Coast Regional Water Quality Control Board (CCRWQCB) dated December 9, 1998, and as detailed in a letter from PG&E dated January 8, 1999 (DCL-99-503). This program includes tasks from the Ecological Monitoring Program (EMP) with additional stations and increased sampling frequencies. This program replaces the EMP and the Thermal Effects Monitoring Program (TEMP). Several one-year-only tasks outlined in the above letters were completed in 1999 and were not requested to be performed in 2023. Results of 2022 RWMP data collection were submitted to the CCRWQCB on April 27, 2023. A table in Appendix 3 summarizes requirements and completed monitoring tasks for 2023.
- 2. In Situ Bioassay Results of the Mussel Watch Program are reported to the CCRWQCB directly by the Moss Landing Marine Laboratories (administered by San Jose State University) in their periodic report for this program.
5
8/22/23-Unit-2 Biofouling of monitor.
Cleaned monitor and 8/23/23 6 Readings returned to service.
9/23/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 9/25/23 19 Readings returned to service.
11/27/23 to Unit-1 Biofouling of monitor.
Cleaned monitor and 12/03/23 19 Readings restored flow.
12/28/23 to Unit-1 Biofouling of monitor.
Cleaned monitor and 12/29/23 7 Readings restored flow.
10/06/23 to Unit-2 Photometer clogged by biofouling.
10/07/23 6 Readings Cleaned Photometer.
10/12/23 to Unit-2 10/13/23 5 Readings Sample pump failed.
Repaired sample pump.
10/16/23 Unit-2 Photometer clogged by biofouling.
2 Readings Cleaned Photometer.
10/20/23 Unit-2 Chart paper not installed correctly.
Chart paper re-installed correctly.
1 Reading 10/24/23 to Unit-2 Biofouling of monitor.
Cleaned monitor and 10/25/23 6 Readings restored flow.
11/15/23 to Unit-2 Once through cooling flow was too low. Second circ water pump started.
11/17/23 4 Readings 11/25/23 Unit-2 Biofouling of monitor.
Cleaned monitor and 3 Readings restored flow.
12/01/23 to Unit-2 Biofouling of monitor.
Cleaned monitor and 12/03/23 10 Reading restored flow.
12/13/23 to Unit-2 Biofouling of monitor.
Cleaned monitor and 12/16/23 3 Readings restored flow.
12/28/23 to Unit-2 Biofouling of monitor.
Cleaned monitor and 12/29/23 7 Readings restored flow.
- b.
Sampling Error On 7/10/23 it was discovered by DCPP Chemistry that the 2023 Intake and Discharge Ammonia (NH3) samples had not been taken during the monitoring period. Investigation revealed that samples were taken on 4/26/23 but the samples arrived to the ELAP certified vendor lab above the temperature tolerance for an NH3 sample. A re-sample was scheduled but not performed before 6/30/23. A phone call was made to Region 3 Water Quality Control Board to inform them of the missed sample. A make-up sample was performed and shipped to a different ELAP certified vendor lab on 7/12/23 and results were received on 7/14/23. This sampling error was reported in the 2nd quarter 2023 report. Results were as follows:
Reporting Limit - 0.050 mg/L Minimum Detection Limit - 0.020 mg/I Intake - DNQ(0.024 mg/L)
Discharge (001) - DNQ(0. 031 mg/L)
- c. Discharge Exceedance Events No discharge constituent or criteria exceedance events occurred during 2023.
4
02/13/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 02/15/23 12 Readings returned to service.
02/25/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 02/28/23 4 Readings returned to service.
03/09/23-Unit-2 Biofouling of monitor.
Cleaned monitor and 03/10/23 6 Readings returned to service.
03/27/23-Unit-2 Biofouling of monitor.
Cleaned monitor and 03/28/23 6 Readings returned to service.
06/05/23 to Unit-1 Biofouling of monitor.
Cleaned monitor and 06/07/23 11 Readings returned to service.
04/04/23 Unit-2 Stuck Chart Recorder.
Fixed chart recorder.
1 Reading 05/28/23 to Unit-2 Stuck Chart Recorder.
Fixed chart recorder.
05/30/23 5 Readings 06/05/23 to Unit-2 Biofouling of monitor.
Cleaned monitor and 06/08/23 13 Readings returned to service.
6/13/23 Unit-2 Biofouling of monitor.
Cleaned monitor and 2 Readings returned to service.
06/27/23 to Unit-2 Biofouling of monitor.
Cleaned monitor and 06/28/23 4 Readings returned to service.
07/14/23 Unit-1 Biofouling of monitor.
Cleaned monitor and 1 Reading returned to service.
7/26/23 -
Unit-1 Failed QC.
Re-calibrated monitor and 8/3/2023 42 Readings returned to service.
8/13/23 -
Unit-1 Biofouling of monitor.
Cleaned monitor and 8/16/23 15 Readings returned to service.
8/21/23 -
Unit-1 Biofouling of monitor.
Cleaned monitor and 8/22/23 7 Readings returned to service.
9/12/23 -
Unit-1 Biofouling of monitor.
Cleaned monitor and 9/14/23 11 Readings returned to service.
9/20/23 Unit-1 Biofouling of monitor.
Cleaned monitor and 3 Readings returned to service.
9/24/23-Unit-1 Biofouling of monitor.
Cleaned monitor and 9/27/23 5 Readings returned to service.
7/01/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 7/03/23 10 Readings returned to service.
7/09/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 7/14/23 3 Readings returned to service.
7/26/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 8/1 /23 6 Readings returned to service.
8/13/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 8/16/23 8 Readings returned to service.
8/16/23 -
Unit-2 Failed QC.
Re-calibrated monitor and 8/23/23 48 Reading returned to service 3
- 3. Laboratories Used to Monitor Compliance The following laboratories were used during 2023 for monitoring compliance. The laboratories are certified by the California Environmental Laboratory Accreditation Program (ELAP) for the analyses performed. To satisfy requirements of the ELAP biannual certification process, these laboratories take part in annual performance evaluation testing.
- a.
PG&E Chemistry Laboratory, DCPP, Avila Beach, California (EPA Lab# CA01036)
- b. Aquatic Bioassay Consulting Laboratories, Ventura, California (EPA Lab# CA00021)
- c. ALS Environmental, Kelso, Washington (EPA Lab# WA01276)
- e. Abalone Coast Analytical, San Luis Obispo, California (EPA Lab# CA01543)
- f.
E. S. Babcock & Sons, Inc., Environmental Laboratories, Riverside, California (EPA Lab# CA00102)
- g. BSK Associates, Fresno, California (EPA Lab# CA00079)
- i.
Weck Laboratories, Inc., Industry, California (EPA Lab# CA00211)
- 4. Review of Compliance Record and Corrective Actions
- a.
Circulating Water Chlorination/Bromination Monitoring The 2023 quarterly NPDES reports discuss chlorination cycles when discharge monitoring was interrupted. These events are listed below, with brief descriptions of the cause and respective corrective action. When these monitoring interruptions occurred, engineering evaluations were performed (as approved by the CCRWQCB January 13, 1994; PG&E Letter No. DCL-94-002).
Descriptions of these evaluations are included in the respective quarterly reports as applicable.
The evaluations concluded that discharge chlorine limits were not exceeded during these events.
Date Unit and Number of Cause Corrective Action Readings Replaced 01/08/23 Unit-1 Biofouling of monitor.
Cleaned monitor and 1 Readings restored flow.
01/12/23 -
Unit-1 Stuck Chart Recorder.
Fixed chart recorder.
01/13/23 4 Readings 01/15/23 -
. Unit-1 Biofouling of monitor.
Cleaned monitor and 1/18/23 11 Readings restored flow.
01/23/23 -
Unit-1 Biofouling of monitor Cleaned monitor and 01/26/23 4 Readings restored flow.
02/11/23 -
Unit-1 Biofouling of monitor.
Cleaned monitor and 02/15/23 9 Readings restored flow.
02/22/23 -
. Unit-1 Biofouling of monitor.
Cleaned monitor and 02/23/23 2 Readings restored flow.
02/28/23-Unit-1 Biofouling of monitor.
Cleaned monitor and 03/02/23 11 Readings restored flow.
01/11/23 -
Unit-2 Biofouling of monitor.
Cleaned monitor and 01/18/23 20 Readings returned to service.
2
2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant OVERVIEW This annual summary report follows the format used in quarterly monitoring reports. Analytical results below the respective analytical detection limit (ND or non-detect) are plotted as a "zero" value in accordance with ELAP guidance. Results between the analytical detection limit and reporting (quantitation) limits are plotted at the value and shown as 'DNQ' in the tabular summaries as is done for CIWQS reports. Less-than results are typically reported to express an average of values that include non-detects and at least one result greater than the respective reporting limit (RL). These less-than results are plotted conservatively at the RL. During 2023, discharges occurred from all discharge paths except 0011, 001K, 016, and 017.
California Ocean Plan Table B substances that were not analyzed for have not been added to the discharge stream. The substances listed in Table B in the California Ocean Plan were each analyzed for and reported in the permit renewal application and application updates for Diablo Canyon Power Plant (DCPP) submitted in October 1994, January 2001, and April 2011. There have been no changes in activities conducted at the plant that would have significantly affected the results previously reported in the above referenced documents.
SUMMARY
OF MONITORING PROGRAM A. Monitoring of Plant Influent and Effluent
- 1. Monitoring Data
- a. Appendix 1 provides a list of discharge path names for ease of reference. Report Appendix 2 contains monitoring data in tabular and graphical form.
- b.
Discharge 001 D (Liquid Radioactive Waste Treatment System) annual grab samples for lithium, boron, and hydrazine were collected and analyzed in December. Results were ND(< 46 ug/L) lithium, 390 mg/L boron, and ND (< 0.003 mg/L) hydrazine.
- 2. Facility Operating and Maintenance Manual Pacific Gas and Electric Company (PG&E) maintains a multiple volume Plant Manual at DCPP that contains procedures used for operation and maintenance activities at the plant, including those activities that relate to wastewater handling, treatment, sampling, analysis and discharge.
Plant procedures are prepared and reviewed by DCPP Staff and approved by Plant Management. The facility conducts biennial internal audits that review NPDES procedures contained in the plant manual, as well as procedure implementation adherence by responsible workgroups. Ongoing reviews of plant procedures are conducted to assure that the manual remains valid, current, and complete for the facility.
PG&E Letter No. DCL-2024-507 2023 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant TABLE OF CONTENTS OVERVIEW
SUMMARY
OF MONITORING PROGRAM A.
Monitoring of Plant Influent and Effluent
- 1. Monitoring Data
- 2. Facility Operating and Maintenance Manual
- 3. Laboratories Used to Monitor Compliance
- 4. Review of Compliance Record and Corrective Actions B.
Monitoring of Receiving Water
- 1. Ecological Studies at Diablo Canyon
- 2. In-Situ Bioassay C.
Sodium Bromide Treatment Program NPDES Discharge Points PAGE 1
1 1
2 2
5 5
5 6
APPENDICES Appendix 1 -
Appendix 2 -
Appendix 3 -
Tabular and Graphical Summaries of Influent and Effluent Monitoring Summary of RWMP Monitoring for 2023
ANNUAL
SUMMARY
REPORT ON DISCHARGE MONITORING AT THE DIABLO CANYON POWER PLANT (NPDES NO. CA0003751) 2023
environmental program and must be true to the best of my knowledge.
Name:
Trevor David Rebel
Title:
Environmental Manager Page 3 of 3
FIie Name - 2023 DCPP Ann ual Rpt Appendix-1 NPDES Discharaes. odf - 2023 DCPP Annua l Rpt Appendix-2 Tabular &
Graohica l Data.odf - 2023 DCPP Annual Rpt Appendix-3 RWMP Summarv.odf Cover Letter a
lication/ df Data Summary Analytical Results No Analytical Data Measurements Avai lable/ Reported Calculated Values No Ca lcu lated Data Measurements Avai lable/ Reported Lab Batches No Lab Batch Data Ava ilable/ Reported Questionnaire No Question nai re Available Certificate File Description Date Uploaded FIie Size DCPP NPDES Perm it Order 90-09 Discharge Points Table 02/27/2024 75508 bytes Tabular and Graphical Summaries of Influent and Effluent 02/27/2024 292329 bytes Monitorina Summary of Receiving Water Monitoring Program (RWMP) 02/27/2024 85654 bytes Act ivities Title I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.
I certify that I am Trevor David Rebel and am authorized to submit this report on behalf of PG&E Diablo Canyon Power Plant. I understand that I am submitting the following report(s):
- Annual SMR ( MONNPDES ) report for 2023 (due 02/29/2024)
I understand that data submitted in this report(s) can be used by authorized agencies for water quality management related analyses and enforcement actions, if required.
I am also aware that my user ID, password, and answer to a challenge question constitute my electronic signature and any information I indicate I am electronically certifying contains my signature. I understand that my electronic signature is the legal equivalent of my handwritten signature. I certify that I have not violated any term in my Electronic Signature Agreement and that I am otherwise without any reason to believe that the confidentiality of my password and challenge question answers have been compromised now or at any time prior to this submission. I understand that this attestation of fact pertains to the implementation, oversight, and enforcement of a federal Page 2 of 3
eSMR PDF Report Summary: Annual SMR ( MONNPDES ) report for 2023 Summary: Annual SMR ( MONNPDES} report for 2023 submitted by Trevor David Rebel (Environmental Manager} on 02/27/2024.
Facility Name: PG&E Diablo Canyon Power Plant Waterboard Office:
Region 3 - Central Coast Report Effective Dates:
01/01/2023 - 12/31/2023 No Discharge Periods Name Diablo M-001 Diablo M-00lD Diablo M-00lF Diablo M-00lG Diablo M-00lH Diablo M-0011 Diablo M-001]
Diablo M-00lK Diablo M-00lL Diablo M-00l M Diablo M-00lN Diablo M-00lP Diablo M-002 Diablo M-003 Diablo M-004 Diablo M-005 Diablo M-008 Diablo M-009 Diablo M-013 Diablo M-015 Diablo M-016 Diablo M-017 Diablo M-INF Self-Determined Violations No Violations Entered Attachments FIie Name Description Order Number:
R3-1990-0009 Case Worker:
Peter Von Langen, Sarah Crable Dates Comments 01/01/2023 - 12/31/2023 Plant Seawater Evaporators no longer in service.
01/01/2023 - 12/31/2023 Plant Condenser Tube Sheet Leak Detection Dump Tank no longer in service.
01/01/2023 - 12/31/2023 Bio Lab Seawater Supply Line Valve Box not drained during 2023. No Effluent Discharoed.
01/01/2023 - 12/31/2023 Seawater RO System Blowdown Line not drained during 2023. Discharge rarelv used.
FIie Description Date Uploaded FIie Size - 2023 DCPP Annua l Report Overview Section.pdf 2023 Annual Summary Report on Discharge Monitoring at Diablo Can on Power Plant 02/27/2024 162898 bytes Page 1 of 3