ML041910514

NPDES Permit Renewal Additional Information and Comments on Draft Permit

ML041910514
Person / Time
Site:	Millstone
Issue date:	12/09/2003
From:	Scace S Dominion Nuclear Connecticut
To:	Nezianya C NRC/FSME, State of CT, Dept of Environmental Protection
Emch R, NRR/DRIP/RLEP, 415-1590
References
D17510
Download: ML041910514 (160)

Text

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milistofieAnravvswidcnng Dom in o v Clr,0r~6395W D17510 Mr. Charles C. Nezianya

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1JE5 Bureau of Water Management Connecticut Department of Environmental Protection 3

79 Elm Street Hartford, Connecticut 06106

References:

1. Draft permit from CTDEP dated July 24, 2003 (C 10932)

2. Letter from G. D. Hicks to J. Grier dated January 22, 2003 (D17352)

3. Letter from S. E. Scace to J. Grier dated May 20, 2003 (D17458)

4. Letter from S. E. Scace to C. Nezianya dated July 22, 2003 (D17463)

5. Letter from F. Rother to D. Cherico dated January 28, 1998 (D12000)

6. Letter from W. Matthews to M. Harder dated August 31, 2001 (D17249)

7. Letter from G. Hicks to J. Grier dated October 3, 2002 (D 17347)

8. Letter from G. Johnson to J. Grier dated December21, 2001 (D17281)

9. Temporary Authorization Request to Perform Flush and Flow Test of the Fire Protection System Underground Main from Stephen E. Scace to Donald Gonyea, dated July 9, 2003 (D17475)

Millstone Power Station NPDES Permit Renewal Additional Information and Comments on the Draft Permit

Dear Mr. Charles Nezianya:

In conjunction with its pending NPDES permit renewal application, Dominion Nuclear Connecticut (DNC) hereby provides additional information and comments to the Connecticut Department of Environmental Protection (the "Department" or "DEP") on the most recent draft National Pollutant Discharge Elimination System ("NPDES")

renewal permit provided by the Department on July 24, 2003 (the "Draft" Reference 1).

This letter is a follow-up to certain of the letters listed above (References 2 and 3) and our meeting with the Department on March 18, 2003. General (or more global) comments are addressed first and then specific comments are provided in the order of the draft NPDES Permit by Section. Prior requests for modifications to the permit draft that have yet to be addressed by the Department are also included. It should be noted that proposed recommended changes to temperature and "delta T" limits for DSNs 001-1, 001-B and 001-C were included in a separate letter to the Department dated July 22, 2003 (Reference 4) and are incorporated in this letter by reference.

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For ease of reference, DNC has attached a "Requested Changes Matrix" that summarizes the requests in this letter. An index of attachments is also included.

1.

GENERAL COMMENT

S A. Revised Process Descriptions and Line Diagrams Where DNC is requesting changes or additions to wastewater descriptions or monitoring location descriptions, or has described other process wastewater changes or additions in this letter, DNC has included the revised process descriptions and revised line diagrams (Figures 3B and 13B) in Appendix 6. We are collectively identifying these revised process descriptions and line diagrams as Addendum No. 5 to the Millstone NPDES permit application.

B. DSN 006-1 (Table HH) Ethanolamine and Hydrazine Monitoring DNC requests that ethanolamine (ETA) and hydrazine monitoring be changed from weekly to monthly at DSN 006. As summarized below, the average and maximum concentrations for the period of monitoring from the fourth quarter 2000 through the third quarter 2003 show that these constituents are rarely detected. Therefore, DNC believes it is reasonable to request the change in frequency from weekly to monthly. These parameters are currently monitored monthly under EA0100176. DNC believes that it is also reasonable to remove hydrazine limits from this discharge (monitor only). This finding is based on a comparison of the monitoring data to levels that were calculated as being protective of water quality with respect to aquatic toxicity (566 ug/l average monthly limit and 1135 ug/l maximum daily limit; see Reference 2, page 5 and Table 4).

4th Quarter 2000 - 3rd Quarter 2003 Data Summary for DSN 006 Sampled Under EA0100176 Parameter Ave.

Max.

Ave.

Max.

Number Number of Monthly Daily Concentration Concentration of Non-Detect Limit Limit (ugh)

(ug/h)

Analyses (ND) Results (ug/l)

(u,/l).

ETA

_ 854*

<2,500 72 72 Hydrazine 50.0 300.0 4.8*

13.1 72 64

• The average concentration is calculated using the detection limit for non-detect results.

C. Section 10-Alternative Pathways General:

Revisions to Section 10 (Kj were discussed with the Department on March 18, 2003.

Consistent with those discussions, clarifications to Section 10 (K) were proposed as part of DNC's letter dated May 20,2003 (Reference 3). DNC proposed modifying Section 1O(K) to provide for the following:

• clarify that the report is for "administrative purposes only", and that compliance with the Department's regulations for permit reporting is based upon information required by Sections 8 and 9 of the permit, and D17510 2

• allow for an annual request for determination by DNC to the Department for eliminating the requirement for the "annual report" specified in Section 10(K).

As a follow-up to our prior discussions, DNC also proposes the following revisions to Section 1O(K):

"On or before January 31 of each year the permittee shall submit for the review o to the Commissioner e an administrative report summarizing all discharges which have been redirected to an alternative pathway, as authorized under Section 4(I), within the previous twelve month period. The report shall list the date, volume, and location of the redirected discharges. The report shall also explain the reason indicate which one of the factors listed in Section 4, Paragraph (HI), or which other reason, precipitated the redirection of fef redikeeing any discharge to an alternative location. In addition, the report shall summarize any violations of the effluent limitations specified within this permit for these discharges. The permittee may include in this annual report a request to discontinue the future submission of this report."

With respect to alternate pathways, DNC has updated the attached summary Table 1 of alternate pathways. Discharge specific changes are summarized in Section II of this letter.

Addition of alternatives for discharge of containment under-drain sumys:

The process descriptions for DSNs OO1C, OO1C-4, OO1C-5 and 006, found in Appendix 6, have been modified to reflect the possible future addition of Unit 3 containment building under-drain sumps pending engineering review of alternatives for discharge of these waters. This discharge would primarily consist of groundwater. While the draft permit dated July 24, 2003 incorporated these waters in DSN OOIC-4, the alternative pathways listed above are also available. The discharge of such waters via an alternate pathway will occur according to the protocols identified in Paragraph 4(H) of the draft permit in that the effluent limitations of the receiving discharge will be complied with.

D. Section 10 - Compliance Schedules In DNC's letter dated January 22, 2003 (Reference 2, page 10 and 11), the status of all submissions already made under Section 10 was summarized. At that time, DNC listed all completed reports and studies, and requested, for those provisions that have been satisfied, that the specific compliance conditions be deleted. In DNC's letter dated May 20, 2003 (Reference 3), additional clarification was provided with respect to the Nitrogen Loading and Reduction Study; DNC believes it has been fully responsive to these draft permit conditions and requests that the Department provide a status determination for paragraphs E, F, G, H and I of Section 10, so that if supplemental information is necessary, DNC can respond to the Department in a timely fashion. For each condition the Department determines has been satisfied, DNC respectfully requests that the draft permit conditions be removed.

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By way of summary, DNC has made considerable progress toward hydrazine minimization and implementation of environmentally beneficial projects. This includes preparation of various studies as well as facility modifications. As indicated in Reference 2, Molybdenum chemistry substitution for hydrazine has proceeded in certain closed cooling water systems. To date, LCS 1200 (a molybdenum based corrosion inhibitor) has been substituted in the Unit 2 emergency diesel cooling waterjacket and the Turbine Building Closed Cooling Water Systems (TBCCW).

Similar changes have occurred in the Unit 3 TBCCW. In addition, modification of steam generator system operating procedures was implemented at Unit 3 during its last refueling outage to reduce the quantity of hydrazine in wet layup discharges. Rather than discharging steam generator wet layup waters containing hydrazine directly to the environment, the layup water was allowed to remain in the generators during restart and dissipate during the heat up process.

The addition of hydrazine treatment systems for DSNs OO1B-6 and OO1C-6 (condensate polishing facilities) with Department approval has also substantially reduced the discharge of hydrazine to the environment. A reduction of hydrazine discharged in excess of 50% has been achieved from these treatment process modifications alone (Reference 2).

Similarly, Millstone has undertaken an initiative to significantly reduce its use and consumption of domestic water. Projects underway include recycling the Unit 2 steam generator blowdown, DSN OO1B-1, which will save approximately 52 million gallons annually when implemented. Eliminating the use of domestic water within the hypochlorite injection system at Unit 3 is expected to save 10 million gallons annually.

Research projects are also underway to evaluate the use of filter media such as charcoal to reduce the concentrations of Freon found within the closed cooling water systems and to explore opportunities to further reduce the use and discharge of ETA in the secondary plant (steam generator) system.

E. Temperature Limits on Internal Discharges As outlined in our May 20, 2003 letter (Reference 3), DNC requested the deletion of temperature limitations from internal unit discharges. Specifically, DNC requested the deletion of temperature limits on DSNs OO1B-8, OO1B-9, OO1C-6, OO1C-8 and OOlC-9.

In the most recent permit draft, the limits and monitoring were deleted for DSNs OO1B-8

-and OOlB-9, but not for OOlC-6, OOIC-8 and OOlC-9. DNC respectfully requests that the Department delete the internal temperature limits and monitoring for discharges OO1C-6, OO1C-8 and OOlC-9. Reference 2 provided heat balance calculations showing that the resultant effect on the Unit discharges (001-B and 001-C) was essentially undetectable and as a result internal limitations are not necessary.

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DNC also requests that the proposed hourly temperature monitoring for unit service water DSNs OO1B-5 and OOIC-S be changed from hourly back to weekly. DNC believes that the proposed hourly frequency of monitoring is unwarranted since temperature is already continuously monitored at the unit discharges (DSNs 001-B and 001-C), which include service water inputs. In addition, DNC requests that the temperature limits for these discharges (001B-5 and OOIC-5) be deleted. As shown on Table 1 in Reference 3, the maximum temperature values reported for the period 2000 to 2001 did not show any exceedances of the temperature limits for these discharges. Also, there were no exceedances for the same period for DSNs 001-B and 001-C. Because temperature is continuously monitored at the unit discharges (001-B and 001-C), DNC believes it is reasonable to request deletion of the internal temperature limits at DSNs OO1B-5 and OOIC-5 (Tables M and Y, respectively).

F. Analytical Methods Based on a DNC request (Reference 3), the Department included in Section 6(A) 8 of the draft permit certain analytical methods that are not defined in 40 CFR 136. DNC's review of this section indicated that Chlorine, Free Available was listed twice.

Accordingly, DNC suggests the following change to the last line of that section reflecting the analysis of Total Residual Chlorine as well as Free Available Chlorine: "and Chlorine, Free Available, Chlorine, Free Available Total Residual, SM 4500-CL G.

In addition, DNC questions whether it is possible to achieve the range within which check standards must be performed i.e., 10% of the free available or total residual chlorine minimum level of 30 ugh. Further guidance on this matter is requested from the Department.

G. Nitrogen Monitoring DNC requests that the Department review the proposed nitrogen species monitoring for DSNs OO1B-1, OO1B-6, OOlC-1 and OOlC-6. The CTDEP Long Island Sound nitrogen management program and the directive in Section 10(I) of the draft permit are focused towards point source nitrogen discharges of 20 lbs per day or greater. Because ethanolamine and hydrazine contribute over 95% of the nitrogen in these major nitrogen contributing pathways, and considering that these constituents are already monitored in these discharges, DNC requests reductions in monitoring for nitrogen species constituents, as detailed below.

Table G (DSN OOIB-1):

Similar to annual monitoring for hydrazine, DNC requests that the weekly sampling and analyses for nitrogen species (TKN, ammonia, nitrite/nitrate) be changed to an annual grab sample. DNC believes that the requirement for weekly sampling and analyses for these parameters is unnecessary as its contribution is less than 3 lbs. per day of nitrogen (see Reference 5).

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Table N (DSN OOIB-6):

DNC requests that proposed weekly monitoring for nitrogen be changed to quarterly monitoring. Most of the nitrogen loading (>95%) results from ETA and hydrazine (see Reference 5, page 4), which are already being monitored at least weekly.

Table T (DSN OOJ C-1):

Similar to annual monitoring for hydrazine, DNC requests that weekly sampling and analyses for nitrogen species (TNK, ammonia, nitrite/nitrate) be changed to an annual grab sample. DNC believes that the requirement for weekly sampling and analyses for these parameters is unnecessary in the context of the small contribution, less than 8 lbs.

per day of nitrogen (see Reference 5).

Table Z (DSN 001 C-6):

DNC believes that weekly nitrogen monitoring should be changed to quarterly for the same reasons as presented for OOlB-6.

H. Total Suspended Solids (TSS) Monitoring DNC submits the following requests for changes to proposed TSS monitoring for certain discharges as detailed below. This request is justified based upon the overall data of compliance with permit limits for these discharges (see Application Addendum No. 4, dated January 3, 2003 Attachment E). For convenience, DNC has summarized this data on the attached Table 2.

Specifically, DNC requests that:

The mass limit for TSS for DSN OOIB-I (Table G) be deleted consistent with DSN OOIC-I (Table T), and the TSS monitoring be changed from weekly to annual monitoring; TSS monitoring for DSN 00 IC-I (Table T) be changed from weekly to annual monitoring; TSS monitoring for DSN OOIC-3 (Table W) be changed from weekly to annual monitoring; TSS monitoring for DSN OOIC4 (Table X) be changed from weekly to annual monitoring; TSS monitoring for DSN OO1C-6 (Table Z) be changed from weekly to annual consistent with DSN OO1B-6 (Table N);

TSS monitoring for DSN 006 (Table HH) be changed from weekly to monthly consistent with the oil & grease monitoring that is required monthly; D17510 6

TSS monitoring for DSN 001C-6(b) (Table BB) be changed from monthly to annual based on the nature of this discharge (Unit 3 auxiliary boiler blowdown) and to be consistent with the frequency of monitoring required for other similar low volume waste streams; and, TSS limits for DSNs 001B-1(a) & 001C-1(a) (Tables H and U, respectively) be made consistent with the 40 CFR 423.12 requirements for low volume waste streams of 100 mg/I maximum daily limit and 30 mg/I average monthly limit (during sludge lancing only).

I. Flow limitations The following responds to the Department's request for: 1) information relative to maximum daily flow at Units 2 and 3 and baseline flow utilized by DNC to calculate percent flow reduction during the winter flounder larval season, and 2) incorporation of a footnote in the permit to clarify flow requirements during the winter flounder larval season relative to the permit provisions suggested in Reference 4.

1) Flows The maximum daily flow limits in the draft permit dated July 24, 2003 for the Unit discharges into the Millstone quarry (DSNs 00111 and 001C) are based on information provided in the permit application Attachment A to Reference 2, updated from previous correspondence dated January 28, 1998 (see Table 4, Reference 5, attached). The maximum daily flows reflect the sum of condenser and service water pump design flows and all the upstream discharges. For Unit 2, the maximum daily flow in the draft permit is correctly shown as 844,550,000 gpd. For Unit 3, the draft permit correctly shows a maximum.daily flow of 1,410,600,000 gpd. In calculating these flows, it was assumed that all of the condenser cooling water pumps are operating as are all of the service water pumps. Unit 2 has four condenser cooling water pumps and three service water pumps.

Unit 3 has six condenser cooling water pumps and four service water pumps.

To determine the percent flow reduction during the winter flounder season under the DNC recommended Option 2 (Reference 4), the operating design cooling water flows for Units 2 and 3 were used. For background on flows used in the studies of alternative cooling water intakes, the Department is referred to page I-96 of the report entitled "An Evaluation of Alternative Cooling Water Intakes (the "Feasibility Study") submitted August 31, 2001 (Reference 6) and a subsequent letter dated October 3, 2002 (page 3, Revised Table 7.11-1 attached; Reference 7).

While the design values per cooling water pump are the same in the permit Application as in the Feasibility Study submittals, the referenced tables related to the Feasibility Study show that when operating, Unit 2 utilizes all 4 condenser cooling water pumps but only two of the three service water pumps. This provides a design operating cooling water flow of 572,800 gpm.

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Unit 3 utilizes all six of the condenser cooling water pumps and two of the four service water pumps. This provides an operating design flow of 948,000 gpm.

The sum of the operating design cooling water flows for Units 2 and 3 (1,520,800 gpm) was used in Reference 4 to estimate the percent flow reduction and for purposes of establishing a permit provision for flow reduction i.e., the 30% three year rolling average (Paragraph A, page 7; Reference 4). Flow reduced, in gpm, for each of the annual scenarios within Option 2 evaluated were compared to 1,520,800 gpm to calculate percent reduction in cooling water flow.

By contrast, the proposed permit provision listed in paragraph C, page 7, Reference 4 is intended to provide the Department with an annual estimate of the reduction in larval winter flounder entrainment as a percentage compared to the number of larvae that would be entrained should Unit 2 and 3 have operated with the above design flows (1,520,800 gpm). In addition, DNC proposes to calculate the reduction in entrainment compared to the historic baseline assuming all three units at Millstone were operating a full operating design flow. DNC believes that the comparative entrainment baseline going forward should be the previously permitted operating flows from all three units (1,964,800 gpm).

The total reduction in entrainment will result from the operational changes in Option 2 for Units 2 and 3 as well as the shutdown of Unit 1.

2) Proposed additional permit language As requested, therefore, the following footnotes are suggested for incorporation in DSNs 001B and OIC.

Table F (DSN COJB) Footnote:

4For purposes of calculating the percent flow reduction achieved during the winter flounder larval season, April 4-May 14, the operating design flow is 572,800 gpm for Unit 2 and 1,520,800 gpm for Units 2 and 3. See Section 10 for the specific permit conditions related to flow reduction.

Table S (DSN 001C) Footnote:

4For purposes of calculating the percent flow reduction achieved during the winter flounder larval season, April 4-May 14, the operating design flow is 948,000 gpm for Unit 3 and 1,520,800 gpm for Units 2 and 3. See Section 10 for the specific permit conditions related to flow reduction.

J. Freon Process descriptions have been modified to reflect the possible presence of Freon in closed cooling waters and its subsequent occurrence in various discharge paths as a result X

of maintenance activities, system leakage or other operational situations such as the lifting of relief valves. The discharges include DSNs 001B-2-10, DSN 006 and DSNs 001C-2-9.

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II. OTHER COMMENTS A. Section 3 DNC requests that the typographical error in Paragraph (E), second to last line, be changed. The word "an" should be changed to "and" in the sentence that reads as follows: "...fish and wildlife in an and on the receiving waters."

In Paragraph (F), DNC believes that the words "best available technology" should be replaced with "best technology available", consistent with 40 CFR 423.13.

B. Section 5 Table A (DSN 001-1):

DNC requests that Table A, remark 10, second sentence, be clarified to read as follows:

"The background sample for turbidity to determine compliance with the effluent limitation shall be a grab sample from the vicinity of the Millstone Harbor or the Environmental Laboratory Boat Dock." DNC believes that both locations are representative of background.

DNC requests that a new footnote or remark be added to Table A (DSN 001-1) as follows: 'Permittee shall maintain all free available chlorine and total residual

)s chlorine analytical data onsite and shall report on the DMR the lowest and highest values for each month." This is consistent with the chlorine recording and reporting requirements for DSNs 001B-5 and 001C-5.

Tables C and D (DSNs 00IA-1 and CO1A-2):

A revised Attachment 0 process description for DSN 001A-1 is included for DEP review in Appendix 6 to include "incidental system leakage from underwater cutting equipment using diethylene glycol as the hydraulic fluid in the cutting equipment, estimated at

<lppm".

DNC requests that the second to last line of the wastewater description in Table C (DSN 001A-1) be modified as follows: "...sluice water from the top and bottom of the beds associated with...".

DNC also requests that the monitoring location description for 001A-1 be clarified as follows: "Immediately following treatment; Sample tape tap off the effluent of the final in-line instrumentation."

In addition, DNC requests that the monitoring location description for OO1A-2 (Table D) be changed to be the same as the description for 001A-1 shown above, as this wastewater would be discharged through the same treatment system and pathway.

Also, with respect to DSNs 001A-1 and 001A-2, DNC requests that based on the Department's review of the process descriptions and Attachment 0 analytical results which were previously provided in Addendum No. 4 to the application, and the revised D17510 9

process descriptions attached to this letter, the monitoring requirements in Table D be consistent with Table C. These discharges are essentially the same. Specifically, monitoring for DSN 00lA-1 currently includes flow, pH, specific conductivity and total suspended solids (TSS) (Table C). DNC requests that the "empty" rows in Table C be deleted and that the monitoring for DSN OOIA-2 (Table D) be modified by deleting both the limits and monitoring for oil & grease, molybdenum, and zinc, thereby making these tables consistent.

Further, DNC requests that the monitoring for specific conductivity be deleted from the monitoring requirements at these Unit 1 discharges as this parameter is not relevant to the revised process description based on decommissioning wastewaters.

DNC believes that remarks 1 and 2 in Table D (DSN 001 A-2) should be deleted, as they are no longer applicable.

DNC also requests that the wastewater descriptions for both DSNs OOlA-l and OOIA-2 be modified to include the following: "In accordance with Section 4(H), stack sump water may be redirected to this alternative location." This source has been included as an input in the attached revised process descriptions (Appendix 6).

Table E (DSN OO1A-5):

DNC requests that Table E be deleted from the current draft permit. This discharge was associated with Unit 1 operation that, as a result of decommissioning, no longer exists.

Tables F (DSN OOJB) and S (DSN 001 C)

DNC requests that a new footnote or remark be added to Tables F and S (DSNs OIB and OO1C) as follows: "Permittee shall maintain all free available chlorine analytical

-data onsite and shall report on the DMR the lowest and highest values for each month." This is consistent with the chlorine recording and reporting requirements for DSNs 00lB-5 and OOlC-5.

Tables G (DSN OOIB-I) and T (DSN 001 C-i):

Table G (OOlB-1) lists hydrazine annual grab sampling under the "Instantaneous Monitoring" column; whereas, in Table T (OOIC-1), annual grab sampling occurs in both the "Flow/Time Based Monitoring"' and "Instantaneous Monitoring" columns. DNC requests that Table T be modified by removing "annual" and "grab" and replacing them with "NR" and "NA", respectively in the row for hydrazine under the column heading "Flow/Time Based Monitoring"'. This will make Tables T and G consistent.

For DSN 001 B-1, DNC requests that the monitoring location description be modified as follows: "Turbine Building sample tap for eaeh either steam generator, ef Auxiliary Building primary sample room valves, or recirculation pump down skid sample valve." (See revised process description in Appendix 6).

DNC also requests that footnote 3 in both Tables G and T be clarified to read as follows:

"Minimum Level Test refers to Section 6, Paragraph A(7)."

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Table H (DSN OOJB-J(a)).

I DNC requests that the wastewater description be modified to include "sludge lancing".

Also, it appears that the notes in the column for "Sample//Reporting Frequency" are incorrect. "(see remark 6)" should be replaced with "(see remark 5)" and "(see remark 7)" should be replaced with "(see remark 6)". Also, it appears that remark 7 is not currently numbered as such and DNC requests that the number be inserted.

Tables Hand U(DSNs OOJB-l(a) & 001 C-i(a)):

DNC requests that the Department delete remark 1 in both Tables H and U. This remark precludes having two steam generators discharging wet layup at any one time. Because each generator is typically discharged over a 5 to 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> period, the resulting concentrations of hydrazine in DSNs 0013B and 001C would be below any toxicity threshold. Please note that the total daily flow limits would remain.

DNC also requests that remark 6 in Table H (001B-l(a)) and remark 4 in Table U (001C-l(a)) be made consistent. Specifically, DNC suggests that remark 6 in Table H be changed to read the same as remark 4 in Table U. This includes sampling for copper, iron, lead, nickel, oil & grease, total suspended solids and zinc during steam generator sludge lancing.

To be consistent with this footnote, DNC requests that copper and iron be added to Table H as follows:

PARAMETER LIMITS & MONITORING Maximum Sample//Reporting Sample Type Instantaneous Limit Frequency' or Maximum Daily Flow Copper, Total

--- mg/l NR (see remark 6)

Grab Iron, Total

--- mg/l NR (see remark 6)

Grab and that copper, iron and lead be added to Table U as follows:

PARAMETER LIMITS & MONITORING Maximum Sample//Reporting Sample Type Instantaneous Limit Frequency' or Maximum Daily Flow Copper, Total

-- mg/l NR (see remark 4)

Grab Iron, Total mg/I NR (see remark 4)

Grab Lead, Total mg/I NR (see remark 4)

Grab In Table U, DNC also believes that remark 7 should be renumbered as remark 5. Similar to Table H, DNC also requests that "see remarks" in Table U be replaced with "see remark 3" for methoxypropylamine, and be replaced with "see remark 4" for Nickel, Total, Oil and Grease, Total, Total Suspended Solids and Zinc, Total.

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Table I (DSN OOJB-2):

In Appendix 6, "Revised Process Descriptions", DNC has modified the process description for DSN OO1B-2 for completeness to include the following bullets:

Unit 3 Aux. Boiler system leakage and drains from maintenance activities Steam generator blowdown Roof drains Plant makeup water (pure water)

DNC does not believe these additions warrant any further changes to the permit as these items do not change the nature of the discharge or the potential chemicals present in the discharge. They are only added for purposes of completeness. (See revised process description in Appendix 6).

DNC also requests that the last line of the wastewater description for DSN OO1B-2 be modified as follows: "Any wastewater redirected to this location from DSNs OOIA-1, 001A-2, stack sump water, 001B-2(a), 001B-2(b), OO1B-1, OO1B-l(a), OO1B-3, 001B-5, OOIB-9, OO1B-1 1, OOIB-10 or 006 condenser pit sumps must be done in accordance with Section 4(H)." These inputs have been included in the attached revised process description (Appendix 6).

Tables J. K and AA (DSNs OOJB-2(a). OOJB-2(b) and OOI C-6(a)):

As previously requested in Reference 1, it is requested that in lieu of the current language, the statement "See Section 10, Paragraph (D)" be inserted in these tables (Tables J & K, & AA) after:

• Maximum Frequency of Discharge;

• Expected Frequency; and

• In the row for "Flow" (instead of specifying a number)

This is consistent with the row for "Maximum Flow per Batch" in these tables. Further, the activities will be defined (including wastewater flow) in a report to be submitted to the Department pursuant to Section 10, Paragraph (D).

Table L (DSN OO1B-3):

Consistent with the process descriptions and line diagrams in DNC's Application as amended in January 2003 (Reference 2), DSN OO1B-1 should be added to the wastewater description as a potential discharge that can be redirected to DSN OO1B-3. DNC is also requesting that DSN OO1B-I 1 be added to the wastewater description as a potential discharge that can be redirected to DSN OO1B-3. This would occur if wastewater from DSN OO1B-1 1 were radiologically contaminated. In addition, DNC is requesting that DSNs OOIA-1, OO1A-2 and stack sump water be added as potential discharges that can be redirected to DSN OO1B-3. (See revised process description in Appendix 6).

The wastewater description would read as follows:

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"Unit No. 2 Coolant Waste Monitor Tank Discharge: Wastewater from the auxiliary building, reactor building and reactor coolant sumps, aerated waste monitoring tanks, aerated waste collected in the coolant waste monitoring tank, and other radiological controlled areas during plant startup, operation, shutdown, incidental system leakage and maintenance. Unit 1 radiologically contaminated wastewaters. In accordance with 4(H),

steam generator blowdown (DSN 00113-1), sludge lancing and wet lay-up may be

.redirected from DSN 1B-1(a), the aerated waste drain tank (and all its inputs) from DSNs OO1A-1, 001A-2, stack sump water, 00113-2, 0013-9,006 (condenser pit sumps) 00113-2(a), OO1B-2(b), OO1B-11 and Unit 2 Turbine building sump may be redirected to this alternative location".

DNC requests that Remark 4 regarding arsenic monitoring, be deleted as arsenic has been deleted from the table as a constituent to be monitored. Consequently, the remarks should be renumbered and the references to remarks in the table be updated accordingly.

In Appendix 6, DNC has also modified the process description for DSN 00113-3 for completeness to include the following bullets:

Unit 3 Aux. Boiler system leakage and drains from maintenance activities Steam generator blowdown Groundwater in-leakage and roof drains Domestic water DNC does not believe these additions warrant any further changes to the permit as these items do not change the nature of the discharge or the potential chemicals present in the discharge. They are only added for completeness. (See revised process description in Appendix 6).

Table M (DSN OOJB-5):

DNC requests that the monitoring location description for DSN 00113-5 be modified to read as follows: "Turbine building closed cooling heat exchangers sampling valve, reactor building closed cooling heat exchangers service water discharge piping manifold sampling valve, Of emergency diesel service water line sampling valve, or auxiliary building service water sample valves." (See process description in Appendix 6).

Tables M (DSN 0O1B-5) and Y (DSN 001 C-5):

DNC requests that the footnotes and remarks for these two tables be made consistent as follows.

DNC requests that Table Y, footnote 1 be changed to read the same as Table M, footnote 1.

DNC requests that remark I in Table M (001)3-5) and footnote 4 in Table Y (00 IC-5) that discuss chlorine monitoring to be conducted during periods of chlorination of the service water system be deleted. Because the service water systems are continuously chlorinated, DNC believes that this remark is confusing and unnecessary.

DNC requests that in Table M (DSN 001)3-5), remark 2 be renumbered as footnote 4 and the row for Chlorine, Free Available be modified to delete the reference to remark 2 and footnote 4 added as a superscript.

D17510 13

DNC requests that in Table Y (DSN OO1C-5), footnote 5 be renumbered as footnote 4.

As previously requested in Reference 1 for DSN OO1C-5, DNC requests that a new footnote 5 be added to both of these tables (OO1B-5 and OO1C-5) for clarification as follows: "Grab samples for Free Available Chlorine monitoring are composed of a flow proportioned average of the operating service water trains." As such, footnote 5 would be added in the row for Chlorine, Free Available as a superscript.

In addition, DNC also requests that the following language in the monitoring location description for DSN OOIC-5 (Table Y) be deleted: "Operating heat exchangers are sampled and results averaged for the total discharge."

Tables N and Z (DSNs 001B-6 and OOJC-6):

Because of the similar nature of the activities that produce these discharges, DNC submits the following requests to make the monitoring required for these discharges consistent.

DNC requests that pH limits for OO1C-6 (Table Z) be deleted, consistent with Table N for DSN OO1B-6.

DNC requests that the row for "Flow, Total" for DSN OO1B-6 be deleted and that remark 1 be changed to be the same as remark 1 for DSN OO1C-6. This will make the flow monitoring and recording requirements consistent between the two discharges.

DNC requests that zinc monitoring be deleted from DSN OO1C-6 since monitoring data provided to the Department (see Reference 1, Table 7) demonstrates that there is no reasonable potential for zinc to exceed water quality criteria in DSN 001-1 as a result of trace levels of zinc in DSN OOIC-6.

Finally with respect to the wastewater descriptions, DNC requests the following additions and changes to DSN OO1B-6 and OO1C-6 based on updated process descriptions (Appendix 6):

DSN OOIB-6 "Condensate Polisher Regeneration wastewater neutralization tank discharge:

Condensate polishing facility operation and maintenance wastewaterf including system area floor drains, vents, incidental leakage, and maintenance activity wastewater, resin regeneration and drain wastewater, condensate system polisher wastewater, fire water, waste evaporator feed tank water, service water (seawater), Unit 3 auxiliary boiler system steam and drainage from condensate recovery tank, domestic water, hot water heating system drainage, plant equipment domestic water wash water, feed water and condensate system drainage (secondary system), air conditioner and air compressor condensate drains, condenser pit sumps, condenser pit sumps GAC filter backwash, steam generator drainage from wet lay-up during startup, shutdown, plant operation, incidental system leakage, and maintenance. This discharge is essentially a batch discharge; however, some of the minor inputs are continuous. Continuous inputs include domestic water inputs from pump and fan seal water and sample sink D17510 14

)

drains. These inputs constitute minimum flow (less than 1 % per hour of tank volume, i.e., less than 250 gallons. In accordance with Section 4 (H), DSNOOlB-1(a) and condenser pit sumps may be redirected to this alternative location during plant operation and maintenance activities".

DSN OOJ C-6:

Unit 3 condensate polishing facility discharge: Unit 3 condensate polishing facility operation and maintenance wastewater including system area floor drains, vents, incidental leakage, maintenance activity wastewater, resin regeneration and drain wastewater, condensate polisher system wastewater, fire water, waste evaporator feed tank water, service water (seawater), steam generator wet layup drainage, hot water heating system drainage, secondary system drainage and air conditioner and air compressor condensate drains during plant start up, plant operation, shut down, incidental system leakage, 3ABD-TK-2 overflow and flow from 3ABD-TK-I or 3ABD-TK-2 and during maintenance activities. This discharge is essentially a batch discharge; however, some of the minor inputs are continuous. Continuous inputs include domestic water inputs from pump and fan seal water and sample sink drains. DSNs OO1B-6, OOlC-l(a), OOlC-6(b) may be redirected to this alternative location in accordance with Section 4(11).

Table 0 (DSN OOIB-8):

DNC again requests that the "Expected Frequency" be deleted from this table. As stated

)

in our letter dated January 22, 2003 (Reference 1), becaus6 volume limitations are specified and the activities are associated with start-up or shut down operations, DNC believes an "expected frequency" provision is unnecessary.

DNC also requests that the monitoring location description for DSN OO1B-8 be deleted and replaced with the following, which better describes the sample location: "Sample valves on the discharge piping of the condensers or sample valves on the discharge piping of the condensate pumps." (See revised process description in Attachment 1).

DNC also modified the process description to change the potential freon concentration from 50 ppb to 200 ppb.

Table P (DSN OOJB-9):

DNC requests that DSN OOlB-1 1 be added to the wastewater description as a potential discharge that can be redirected to DSN OO1B-9 (Table 1). In addition, DNC requests the following wording changes to further clarify the process waters described in the attached process descriptions:

"Unit No. 2 Closed Cooling Water System Drainage: Turbine building, reactor building closed cooling water drainage, chilled water system drainage, hydrolazing wastewaters, domestic water, demineralized water, service water and incidental system leakage during startup, plant operation and maintenance. In accordance with Section 4(H),

! RBGCCW that is normally directed to DSNs OOEB 5 and O1MB 8 may be redirected to this alternative location via the RBCCW sump during maintenanee activities, if radiologically D17510 15

I contaminated and requiring treatment at this location. 'In accordance with Section 4(H), DSNs 0010-5, 001B-8 and 001B-11 may be redirected to this alternate location.

DNC requests that monitoring for dichlorodifluoromethane be deleted from Table P because this freon is not used in Unit 2 closed cooling water systems. Similarly, it is requested that remark 2 be modified to delete the words "and dichlorodifluoromethane".

DNC also requests that the monitoring location description for DSN OOIB-9 be modified as follows for clarification purposes: "Sample valves for reactor or turbine building sample sink, ef turbine building closed cooling water heat exchangers in-auxiliary building primary sample room or local sample valves; chilled water heat exchanger local sample valves, reactor building closed cooling water heat exchangers sample valves, chilled water heat exchanger sample valves, or chill water pump discharge sample valves." (See revised process description in Appendix 6).

Table 0 (DSN OOJB-JO):

As previously requested in Reference 1, DNC requests that Table Q be modified as follows: under the "Sampling/Reporting Frequency" column for "Flow, Maximum", edit to read "Daily (see remark 1 )" and for "Flow, Total", edit to read "Weekly (see remark 1".

DNC also requests that the wastewater description for DSN OOIB-10 be modified to include "Unit 2 feed and condensate drains", as they are a significant input to this discharge during outages.

DNC has also modified the process description for DSN OOlB-10 for completeness to include the following bullet:

Waterbox drains, incidental system leakage and maintenance activities DNC does not believe these additions warrant any further changes to the permit as these items do not change the nature of the discharge or the potential chemicals present in the discharge. They are only added for completeness. (See revised process description in Appendix 6).

Tables 0 and R (DSNs OOIB-1O and OOJB-1 1):

It appears that the notes in the column "Sample//Reporting Frequency" for methoxypropylamine and molybdenum are incorrect. They state "(see remark 3)" and

"(see remark 4)" respectively, this should be corrected to "(see remark 2)" and "(see remark 3).

Table R (DSN OOJB-1):

DSN OO1C-9 should be deleted and replaced with DSN OO1B-9 as a potential discharge that can be redirected to DSN 001B-1 1. This was requested by DNC (Reference 1) and we believe it was a typographical error that OOlC-9 was added in lieu of OOIB-9. (See revised process description in Appendix 6).

D17510 16

DNC has modified the process description for DSN OOlB-I 1 for completeness to include the following bullets:

Unit 3 Aux. Boiler system leakage and drains from maintenance activities Plant makeup water (pure water)

Roof drains DNC does not believe these additions warrant any further changes to the permit as these items do not change the nature of the discharge or the potential chemicals present in the discharge. They are only added for completeness. (See revised process description in Appendix 6).

Table S (DSN OOC):

Quarterly monitoring for ethanolamine was not removed from the draft permit for DSN 001C (Table S) as previously requested and discussed with the Department. For the reasons presented in Reference 1 (page 8, paragraph D), and as further discussed in Reference 2, DNC requests that ethanolamine monitoring be deleted so that monitoring requirements for DSNs O01B and OOIC are consistent.

Table U (DSN OOJ C-I (a):

DNC requests that the monitoring location description for DSN OOIC-1(a) be modified as.

follows: "Sampling valve on the wet lay up recirculation pump skid discharge piping and drain valve for each steam generator recirculation header in the Unit 3 containment building, or the main steam valve building discharge header." This will allow flexibility when the recirculation pump skid is not available or accessible. (See revised process description in Appendix 6).

Table V(DSNOOIC-2):

DNC requests that specific conductivity be deleted from monitoring at DSN OO1C-2.

Specific conductivity is not relevant for this discharge in that it has no environmental significance relative to this low volume waste stream discharge to seawater. DNC also requests that lithium monitoring be deleted because lithium has not been detected in this discharge over the period of record as presented in Attachment E of the Application Addendum No. 4.

Table X (DSN OOJ C4):

DNC requests that the wastewater description be modified to include "condenser cleaning wastewater, hydrolazing, and incidental system leakage."

Table BB (DSN OOIC-6(b)):

DNC requests that oil & grease monitoring for DSN OOIC-6(b) be changed from monthly to annual based on the nature of this discharge (Unit 3 auxiliary boiler blowdown). DNC also slightly modified the wording in the attached modified process description.

D17510 17

Table CC (DSN OOJC-8):

DNC modified the process description to change the potential freon concentration from 50 ppb to 200 ppb.

Tables EE and FF (DSNs 003 and 003a):

The wastewater descriptions for the screen wash water are identical except for the discharge path. DSN 003a is the fish and invertebrate return trough. DSN 003 is the existing screen wash trash basket with its own adjacent discharge. As a result, DNC is suggesting that wastewater description for DSN 003a be modified to read as follows:

"Unit 2 fish and invertebrate return trough discharge including wastewaters incorporated in DSN 003" (Appendix 6).

In addition, DNC is asking that the DSN 003 Wastewater Description be modified as follows:

"Unit No. 2 Screen Washwater Discharges, including non-chlorinated seawater taken from the intake used to wash down the traveling screens in all intake bays and domestic water from wash downs and hydrolazing activities, domestic water used as bearing lube water for screenwash pumps, system leakage and maintenance activities during startup, operation and shutdown, screen wash strainer backwash, intake desilting wastewaters, service water pump header discharge and strainer backwash, and fire water used in an emergency to clean the traveling screens. These discharges are normally directed to the Unit 2 fish return (DSN 003a) through the fish and invertebrate return trough".

Tables HH and HH-T (DSN 006-1):

DNC requests that the wastewater descriptions in both these tables be modified to include the following: "Unit 2 and Unit 3 emergency diesel generator room floor drains through oil/water separators; transformer area yard drains through oil/water separators; and generator stator cooling drains." These items were included in the process description for DSN 006 in the Application, Addendum No. 4, and DNC feels they are significant enough to warrant inclusion in the text of the wastewater description. (See revised process description in Appendix 6).

Table HH-T (DSN 006-1):

Consistent with Section 6(A)(3), DNC requests that the Minimum Level for Chlorine, Total Residual be changed to 30 ug/l.

Table H.-

DSN 011 presently consists of stormwater drainage from parking areas and a stonrwater impoundment area, and of fire suppression system discharges. This DSN is currently listed in the station's existing NPDES permit and is included in Table II of the draft NPDES permift. As a result of the construction of Millstone's Independent Spent Fuel Storage Installation (ISFSI), the drainage area associated with this discharge will be reconfigured and the activities occurring within the drainage area will change as a result.

Therefore, this discharge will be eligible for coverage under the CTDEP's General Permit for the Discharge of Stormwater Associated with Industrial Activity. DNC therefore D17510 18

requests that DSN 011 be deleted from Table II in the NPDES permit. Upon issuance of the NPDES permit, DNC will modify their current registration to include DSN 011 under the Industrial Stormwater General Permit (similar to DSNs 005, 007, 009, 012, 015 and 016).

Table KK (Monitoring Site No. 001):

DNC requests that remark 3 in Table KK be coordinated with remark 10 in Table A for consistency. Specifically, DNC requests that remark 3 in Table KK be changed to read as follows: "Turbidity and Total Suspended Solids monitoring is only required on days when desilting operations wastewater from either Unit 2 or Unit 3 is discharged to the Quarry. The background sample for turbidity to determine compliance with effluent limitations shall be a grab sample from the vicinity of the Millstone Harbor or the Environmental Laboratory Boat Dock."

Table MM:

DNC requests that the word "grab" be changed to "composite" in the second line in the row for "physical-chemical measurements of composite effluent sample and control. This is consistent with the sampling requirements of daily composite samples.

C. Section 7 Paragraph (6):

- A DNC requests that "total dissolved nitrogen" be deleted from this section, making this list of testing analytes consistent with the lists in Tables MM and NN.

D. Miscellaneous Sacrificial Anodes used at the Intake Structures DNC has modified and attached the process descriptions for DSNs 003, 003-A, 004, 006, 001-B and 001-C to describe the use of cathodic protection systems at the station. These systems are in place at the Unit 2 and Unit 3 intake structures. In addition, there are other impressed current cathodic protection systems in place in other areas at the station, such as the condenser waterboxes, and galvanic protection at some oil/water separators.

At both intake structures, impressed current anodes and electrodes are located in the water at the outermost part of the intake bays to minimize corrosion to the trash racks and intake pumps. At Unit 2, there are 24 anodes made of silver, antimony and lead and 8 electrodes made of zinc. At Unit 3, there are 12 electrodes made of silver-silver/chloride, 72 high silicon cast iron anodes and 32 platinum clad niobium anodes.

The anodes and electrodes are inspected periodically and are replaced if the anode/electrode is less than one-half the original size. Therefore, DNC does not believe there is a need to modify any wastewater descriptions or monitoring in the draft permit; however, DNC seeks to add this activity description to the above-referenced process descriptions for the purposes -of completeness.

D17510 19

Fire Water Flush and Flow Test DNC performs a flush and flow test of the station's main fire protection system periodically to ensure operability. Recently, DNC obtained a Temporary Authorization for this activity. The Temporary Authorization Application submitted to the Department (Reference 8) provided a detailed description of this activity. Going forward, DNC would like to have this activity covered in the NPDES permit so that a Temporary Authorization is not required for this activity after the NPDES permit is issued. As such, we have provided below a brief description of this activity, including where in the permit DNC is requesting this activity be authorized. Additional details and best management practices (BMPs) were included in Reference 9.

DNC requests the flexibility to conduct this activity once per year. This activity is performed in two phases: (1) the flushing of sediment; and (2) the testing of flow from five (5) major loops within the station's fire protection system underground main, and a sixth test where all the loops are open, thus restoring the system to normal alignment.

Millstone has two 250,000-gallon fire water storage tanks that are filled automatically via a connection to the City of New London water system. Each phase of this activity is described in more detail below.

Flush Phase of Fire Water System Test:

This phase consists of the flushing of fire water from the system at a high flow rate to remove sediment and corrosion byproducts from the 5 major piping loops and sixth test configuration (all loops open). A large holding tank (approximately 20,000 gallons) is used to initially collect the water and allow settling and collection of sediment.

Subsequently, this water is pumped, at a much lower flow rate, through a series of filter socks onto a grassed area east of the Unit 3 Intake Structure. The majority of this water runs off from the grassed area then reaches the last catch basin prior to discharge to Niantic Bay for DSN 006, although some water could enter other catch basins in the vicinity that all discharge to Niantic Bay. The last catch basin for DSN 006 is located immediately adjacent to the Unit 3 Intake Structure and is downstream of the NPDES dry weather flow sampling and flow monitoring location for this discharge. The catch basins are protected with hay bales during this activity.

Flow Phase of Fire Water System Test:

The flow phase of this testing utilizes a bank of four nozzles connected to a fire hydrant located between the Units 1 and 2 Intake Structures. The flow is measured to assure it meets the NRC Safety Technical Specifications. Flow is directed over the perimeter security fence onto an area of rock outcrop and directly into Niantic Bay between the Units 1 and 2 Intake Structures. This flow test is conducted for each of the 5 major piping loops as well as the sixth test configuration (all loops open). The combined total flow from the flush and flow phases of the test is estimated to be less that 2,800 gpm.

The total flow is expected to be less than 250,000 g/day. Measurements of pH taken from samples collected at the start of previous flow tests indicate that pH is typically less than 9.5 pH units.

D17510 20

Potential Constituents in Discharge:

The fire water storage tanks are stabilized, meaning new city water additions are minimized, for the week prior to conducting this activity. During the testing, tank volume turnover will result in more city water makeup being added to the system.

Constituents that could be present in the water discharging from this activity include domestic water constituents (chlorine and zinc). In addition, Bulab 6002, which may be used for biofouling control in the fire water system in the future, may be present in this water.

Requested NPDES Permit Changes:

DNC requests coverage of this activity in the NPDES permit. DNC has modified the process description for DSN 006 to include the flush phase of this test, and for DSN FW to include the flow phase of this test. (See revised process descriptions in Appendix 6).

With respect to the NPDES permit, DNC requests that the wastewater description for DSN 006 (Tables HH and HH-T) be modified such that the words "fire suppression system discharges" be replaced with "fire suppression system discharges, includingflush phase of fire water system test".

DNC also requests that the wastewater description in Table FW be modified such that the words "Fire suppression system discharges" be replaced with "Fire suppression system discharges, includingflow phase of fire water system test". Also in Table FW, DNC requests that the discharge serial numbers listing be modified to include the following:

"fire water system flow test to Niantic Bay".

If you have any questions regarding this letter, please call Paul Jacobson at (860) 447.1791, x2335.

Very truly yours, DOMINION NUCLEAR CONNECTICUT, INC.

.3 Stephen E. Scace Date Director - Nuclear Station Safety and Licensing Cc: Ken Major, DEP D17510 21

)

Appendices to Letter D17510 Additional Information and Comments on the Draft Millstone NPDES Permit.

1) Matrix of proposed changes to the draft permit dated August 24, 2003.

2) Table 1, corrected table of alternative pathways

3) Table 2, TSS analytical results from Attachment E, Addendum 4 to the permit application

4) Letter D12000 from R. Rothen to D. Cherico dated January 28, 1998 including a summary of total station flows.

5) Revised Table 7.11-1, Letter D17347 from G. Hicks to J. Grier dated October 3, 2002.

6) Addendum 5 to the NPDES permit renewal application

a. Revised process descriptions - Attachment 0

b. Revised Line Diagrams 3B and 13B - Attachment M D17510

N' Appendix 1 Matrix of Proposed Changes to Draft Permit dated August 24, 2003 D17510

REQUESTED CHANGES MATRIX MILLSTONE NPDES PERMIT RENEWAL DRAFT NPDES PERMIT DATED 07/24/03 N1 "Permit Section Table Page Affected Requested Modification l Page in and Paragraph DSN(s)

Letter l D17510 Section 3: Commissioner's Decision 3(E)

__l_4 Correct typo J I.A, pg. 9 3()

__5

___I Correct wording IL.A, pg. 9 Section 5: Specific Effluent Limitations and Monitoring Requirements 5(A)

A 7

001-1 Modify/add remarks II.B, pg. 9 5(A)

C & D 10 & 11 001A-1 &

Modify wastewater descriptions, 11.1l, pg. 9 001A-2 monitoring location descriptions, monitoring requirements & remarks 5(A)

E 12 OO1A-5 Delete table 11.B, pg. 10 5(A)

F&S 13 & 31 001B &

Add footnotes I.I, pg. 7 001C 5(A)

F&S 13 & 31 001B &

Add remark 11.B, pg. 10 OO1C 5(A)

G 15 00113-1 Change monitoring (weekly to annual)

I.G, pg. 5 for TKN, ammonia, nitrite, nitrate 5(A)

G 15 001B-1 Delete mass limit for TSS & change 1.11, pg. 6 monitoring (weekly to annual)

>5(A)

G & T 15 & 33 001B-1 &

Clarify monitoring, modify monitoring 11.B, pg. 10

)_OO1C-1 location description, modify footnote 5(A)

H 16 001B-1(a)

Change TSS limits I.H, pg. 7 5(A)

H 16 001B-1(a)

Modify wastewater description, correct II.B, pg. 11 remark references 5(A)

H & U 16 & 34 00113-1(a) &

Delete/modify remarks, modify II.B, pg. 11 001C-l(a) monitoring requirements 5(A)

I 17 001B-2 Modify wastewater description 11.13, pg. 12 5(A)

J, K &

18, 19 & 00113-2(a),

Modify frequency and flow II.B, pg. 12 AA 41 001B-2(b) &

requirements 001C-6(a) 5(A)

L 20 001B-3 Modify wastewater description, delete I1.B, pg. 12 remark, renumber remarks 5(A)

M 22 001lB-5 Delete temperature limits & change I.E, pg. 5 monitoring (hourly to weekly) 5(A)

M 22 001B-5 Modify monitoring location description 1I.B, pg. 13 5(A)

M & Y 22 & 39 001B-5 &

Modify remarks & footnotes 11.13, pg. 13 001C-5 5(A)

N 23 001B-6 Change monitoring (weekly to I.G, pg. 6 quarterly) for TKN, ammonia, nitrite, nitrate 5(A)

N & Z 23 & 40 00113-6 &

Modify monitoring requirements, limits 11.B, pg. 14 001C-6 and remarks. Modify wastewater descriptions D17510 I

REQUESTED CHANGES MATRIX MILLSTONE NPDES PERMIT RENEWAL DRAEJ NPDES PERMIT DATED 07/24/03 Permit Section Table Page Affected Requested Modification Page in and Paragraph DSN(s)

Letter l_

D17510 5(A) 0 25 001B-8 Delete expected frequency, modify II.B, pg. 15 monitoring location description 5(A)

P 26 001B-9 Modify wastewater description, II.B, pg. 15 monitoring requirements, remarks &

monitoring location description 5(A)

Q 27 OOB-10 Modify monitoring rows & wastewater H.B, pg. 16 description 5(A)

Q & R 27 & 29 OOIB-10 &

Modify remark references H.B, pg. 16

_0013-11 5(A)

R 29 OOB-11 Modify wastewater description J.B, pg. 16 5(A)

S 31 001C Delete ethanolamine monitoring II.B, pg. 17 5(A)

T 33 OOIC-i Change monitoring (weekly to annual)

I.G, pg. 6 for TKN, ammonia, nitrite, nitrate 5(A)

T 33 OOiC-1 Change monitoring (weekly to annual)

I.H, pg. 6 for TSS 5(A)

U 34 001C-l(a)

Change TSS limits I.H, pg. 7 5(A)

U 34 001C-l(a)

Modify monitoring location description II.B, pg. 17 5(A)

V 35 OO1C-2 Delete specific conductivity and Il.B, pg. 17

_lithium monitoring 5(A)

W 36 OO1C-3 Change monitoring (weekly to annual)

I.H, pg. 6 for TSS 5(A)

X 37 OO1C-4 Change monitoring (weekly to annual)

I.H, pg. 6 for TSS 5(A)

X 37 OOIC-4 Modify wastewater description II.B, pg. 17 5(A)

Y 39 OO1C-5 Delete temperature limits & change I.E, pg. 5 monitoring (hourly to weekly) 5(A)

Z 40 OO1C-6 Delete temperature limits & monitoring I.E, pg. 4 5(A)

Z 40 OO1C-6 Change monitoring (weekly to I.G, pg. 6 quarterly) for TKN, ammonia, nitrite, nitrate 5(A)

Z 40 001C-6 Change monitoring (weekly to annual)

I.H, pg. 6 for TSS 5(A)

BB 42 001C-6(b)

Change monitoring (monthly to annual)

I.H, pg. 7 for TSS 5(A)

BB 42 001C-6(b)

Change oil & grease monitoring from II.B, pg. 17 monthly to annual 5(A)

CC 44 OO1C-8 Delete temperature limits & monitoring I.E, pg. 4 5(A)

DD 45 OOlC-9 Delete temperature limits & monitoring I.E, pg. 4 5(A)

EE &

46 & 47 003 & 003A Modify wastewater descriptions II.B, pg. 18 EF D17510 2

REQUESTED CHANGES MATRIX MILLSTONE NPDES PERMIT RENEWAL DRAFT NPDES PERMIT DATED 07/24/03 Permit Section Table Page Affected Requested Modification Page in and Paragraph DSN(s)

Letter D17510 5(A)

HH 48 006 Delete limits (hydrazine) & change I.B, pg. 2 monitoring (weekly to monthly for ETA & hydrazine) 5(A)

HH 48 006 Change monitoring (weekly to I.H, pg. 6 monthly) for TSS 5(A)

HH &

48 - 50 006 Modify wastewater description II.B, pg. 18 HH-T 5(A)

HII &

48 - 50 006 Modify wastewater description II.D, pg. 19

_ HH-T 5(A)

HH-T 49 -50 006 Modify minimum level for chlorine fl.B, pg. 18 5(A)

FW 51 Modify wastewater description and list H.D, pg. 19 l

of DSNs 5(A)

II 51 Delete DSN 0l1 from table I.B, pg. 18 5(A)

KK 53 Monitoring Modify remark II.B, pg. 18 Site No. 001 5(A)

MM 54 Modify wording from "grab" to ll.B, pg. 19

_"composite" samples Section 6: Sample Collecti n, Handli g and Analytical Techniques

)(A)(8) 57 Delete "Chlorine, Free Available" I.F, pg. 5 I

which appears twice, add analytical method Section 7: Chronic Toxicity Monitoring Condition 7(A)(6) 59 1

Delete "total dissolved nitrogen" from II.C. pg. 19 list of parameters I

_____pg.__9 Section 10: Compliance Schedules 10(E), (F), (G), 62 Provide status determination or delete I.D, pg. 3 (H) and (I) l l

reporting requirements 10(K)

Modify Alternative Pathway reporting I.C, pg. 2 l_

requirements D17510 3

Appendix 2 Table 1 Corrected Table of Alternative Pathways D17510

TABLE 1 Alternate Pathway Summary - Millstone NPDES Permit Renewal Application Updated November 2003 Based on 7/24/03 Draft Permit Table in Receiving Alternate Pathway Contributor(s)

Draft DSN (Contributing DSN)

Permit UNIT 1 C

001A-1

[001B-2, 001B-3, 001C-2, 001C-3, stack sump water D

001A-2 l 001B-2, 00113-3, 001C-2, 001C-3, stacksump water UNIT 2 G

00113-1 001B-1(a)

I 001B-2 00113-1, 00113-1(a), 00113-3, 00113-5, 001B-9, 001B-1 1, 006 condenser pit sumps, 001B-10, Unit 2 Turbine building sump, OOIA-1, 00IA-2, stack sump water, 001B-2(a), 00IB-2(b)

L 001B-3 001B-I, 00113-1(a), 00113-2, 00113-9,006 condenser pit sumps, 00113-2(a), 00113-2(b), Unit 2 Turbine building sump, 001B-11, OO1A-1, 001A-2, stack sump water N

0011B-6 001B-1(a), condenser pit sumps P

00113-9 00113-5, 00113-8, OOIB-11 Q

001B-10 00113-5, 00113-8, 001B-9, condenser pit sumps R

001B-11 00113-5, 001B-9 (delete 001C-9)

UNIT 3 T

001C-1 OO1C-l(a)

V 001C-2 OO1C-1, OO1C-l(a), 0OIC-3, Unit 3 turbine building sump, 001C-9 W

OO1C-3 OO1C-1, 001C-1(a), 001C-2, 001C-9, Unit 3 turbine building sump X

001C4 001C-6, 001C-6(b), 001C-9, Unit 3 Reactor Containment Building Footing Drains Z

001C-6 001B-6, 001C-l(a), OO1C-6(b)

CC 001C-8 001C-1, OO1C-1(a)

DD OO1C-9 OO1C-8 OTHER EE 003 003A FF 003A 003 Italics = Add DSN to draft NPDES permit Italics and underline = Delete from draft NPDES permit D17510

Appendix 3 Table 2 TSS Analytical Results from Attachment E, Addendum 4 to the Permit Application D17510

)

TABLE 2 Millstone NPDES Renewal Application TSS Results Summary from Application Addendum No.4, Attachment E (Monitoring Data from the period January 2000 through December 2001)

Permit Limit Average Maximum 2nd Highest Analysis DSN (mg/,)

(mg/I)

(mg/I)

Maximum (mg/1)

Number OOlB-l 30.0 0.067 1A0 0.9 196 OOlC-l 60.0 2.49 40.4 40.2 308 OO1C-3 45.0 5.84 44.5 43.7 307 OO1C-4 45.0 3.10 6.00 2.5 3

OO1C-6 45.0 7.88 21.60 21.0 131 006 45.0a 0.86 4.4 5.30 107

' This is the instantaneous limit. The average monthly limit is 20.0 mg/l and the maximum daily limit is 30.0 mg/I.

D17510

)

Appendix 4 Letter D12000 from F. Rothen to D. Cherico dated January 28, 1998 D17510

n Northeast Millstone Offices

• Rope Ferry Rd., Waterford, Cr Utilities System P.O. Box 128 Waterford, CT 06385-0128 (860) 447-1791 January 28, 1998 FRC-98-008 D12000 Mr. David Cherico Sanitary Engineer m Water Management Bureau Connecticut Department of Environmental Protection 79 Elm Street Hartford, CT 06106 Millstone Nuclear Power Station Additional Information on Millstone Waste Streams and LCS-1000. Conguor 3585, LCS-1200 and Carbohydrazide Re:

1) Letter from D. R Cherico to P. Jacobson dated December 5, 1997: Application X

Number 19970187, Northeast Nuclear Energy Company (NNECo)

2) Letter from D. R. Cherico to P. Jacobson dated December 31, 1997: Application Number 19970187, Northeast Nuclear Energy Company (NNECo)

3) Letter from S.E. Scace toD. Cherico datedNovember 21, 1997 (D11716).

Dear Mr. Cherico:

Thank you for meeting with Northeast Nuclear Energy Company (NNECo) representatives on Wednesday January 21, 1998 to discuss various matters related to NNECo's National Pollution Discharge Elimination System (NPDES) permit application dated June 13, 1997.

As discussed with you at that time, we have prepared this letter to respond to questions you raised in References I and 2, and to update and clarify discharge flow information previously submitted in Reference 3.

In response to Reference 1 above, we have prepared a summary of how various waste streams at the Millstone Nuclear Power Facility are generated, collected, and treated. This information is presented in Tables 1 and 2 attached. Table I presents those point source discharges from the Environmental Protection Agency (EPA) development document for the Steam Electric Power Generating industry that you referenced which are either not applicable to nuclear generating units or are not present at Millstone Units 1, 2, or 3. Table 2 presents those discharge categories which are present at Millstone.

0S3422-9 REV. 12.93

I In response to Reference 2 above, we have also prepared Table 3 which presents our estimated five day biochemical oxygen demand (BOD5) concentrations for any discharges for which we are requesting authorization to discharge LCS 1000, Conquor 3585 or carbohydrazide at the time of permit renewal. Consistent with discussions at our meeting with you, we have estimated both expected and worst case BOD5 concentrations where appropriate.

Where literature references have not been found, chemical oxygen demand (COD) values have been calculated based on the referenced chemical formula, and a typical BOD5 to COD ratio of 0.5 has been assumed. The flows used for the various potential discharge points for LCS 1000 and Conquor 3585 are consistent with the flows previously described in our response to your initial information Request No. 22 of October 4, 1997. The potential future use of Conquor 3585 in Unit 3 auxiliary boiler and LCS 1200 in Unit 3 closed cooling water systems has also been addressed. The BOD5 contribution of Conquor 3585 in Unit 3 discharges (006 and 001C-6(b)) for this use would be the same as that calculated for the other use points (<1 mg/L BOD5). LCS 1200 has similar chemical composition to LCS 1000, except that the tolyltriazole concentration is only 0.5 percent by weight. The estimated BOD5 in an undiluted wastewater stream would then be 30 mg/L.

Potential discharge points of LCS 1200 for Unit 3 would be Discharge Serial Numbers (DSN) 001C-2, 001C-3, 001C-4, or 001C-9. Some reduction of BOD5 would be realized through the treatment (demineralizers) employed for DSN 001C-2.

Pursuant to our previous discussions, we have also reviewed and refined the Unit Maximum Daily Flows previously submitted as an attachment to Reference 3. These revised flows are presented in Table 4.

We anticipate, as discussed with you, that we will be submitting Addendum No. I to NNECo's NPDES permit application dated June 13, 1997 on or before January 30, 1998.

Should you have any questions, please call Mr. Paul Jacobson, Manager Environmental Services - Nuclear at (860) 447-1791 extension 2335. We are available to meet and discuss our responses with you at your convenience.

Very truly yours, NQRTMA SCLEAOMPANY F. C. Rothen Vice President -N ear Work Services cc:

NRC Resident Inspectors NRC J. Grier

I I

Table 1 Discharge Classification not applicableto nuclear generating units or not present at Millstone (U-1,2,3):

CTDEP EPA Development Item Document Point Source No.

Discharge Category NNECO Response

2.

Recirculating Cooling Circulation water and service water flow are once-System Blowdowns through cooling; primary side water in reactor building systems for U-1, U-2 and U-3 is routed to radioactive waste treatment (001A-1, 001A-2, 001A-4, 001 B-2,001 B-3,001 C-2,001 C-3) as needed.

3.

Fly Ash Transport Discharge N.A., applicable only to fossil fuel generating units

4.

Bottom Ash Transport N.A., see 3.

Discharge

5.

Metal Cleaning Wastes Air preheater wash - N.A., see 3.

Fireside wash - N.A., see 3.

Boiler tube cleaning - development document is explicit to fossil fuel type boilers; steam generator cleaning/decon discharges (001 B-2 (a), (b) and 001 C-6 (a) would be the only analogous discharges if they occur)

Cleaning rinses - same response as boiler tube cleaning.

6.

Low Volume Wastes Clarifier blowdown-N.A., process not used; Ion exchange softener regeneration - N.A.,

process not used Ume softening - N.A., process not used Evaporator blowdown - N.A., process not used

7.

Ash Pile, Chemical Handling N.A., see 3.

and Construction Area Run Off

8.

Coal Pile N.A., see 3.

9.

West Flue Gas Cleaning N.A., see 3.

Blow down

)

Table 2 Discharge Classifications that are applicable to and present at Millstone.'

CTDEP EPA Development Item Document Point Source No.

Discharge Category NNECO Response

1.

Once -through cooling

- circulating water systems and service water systems water for U-1,2 and 3 (001A, B and C less all subdischarges except 001A-5, 001B-5 001C-5)

6.

Low Volume Wastes Make-uD water filter backwash - the Ecolochem make-up water treatment system for Unit 3 generates this wastewater stream using an ultrafiltration process (see Millstone response to CTDEP date 10/4/97, Request No.

15); this discharge is currently a component source to DSN 001 C-4; the uEcolochemr system that serves Unit 1 and Unit 2, using multimedia pressure filters, generates this type of wastewater with a sanitary sewer discharge; with no treatment provided (general permit registration In preparation).

S Demineralizer regeneration - no demineralizer wastewater Is generated on-site during primary make-up water production; condensate polishing produces this type of wastewater for U-2 and U-3, Included in DSNOOB-6 and DSNOO1C-6, respectively; treatment provided is pH control using acid/caustic Powdered resin demineralizer back flush - see response to Idemineralizer regeneration' Reverse osmosis 1R.O.) brine - see response to

'make-up water filter backwash";R.O. brine is produced in both mEcolochem' systems; R.O.

brine Is treated with granular activated carbon for chlorine removal prior to discharge to DSNO06.

Boiler blowdown-U-1 auxiliary boiler blowdown Is routed to 001A-2; the main steam generators for U-2 and U-3 produce discharges to DSNOO1 B-1 and DSNOO1 C-1, respectively; also, U-3 auxiliary boiler blowdown is a component of DSN001C-6 (a); no treatment provided Laboratory drains - laboratory drains that are potentially contaminated with radioactivity are routed to the appropriate radwaste treatment systems in each unit (OOO1A-1,2,3;001i3-2,3;001 C-2,3) r

)

Table 2 Discharge Classifications that are applicabl to and present at Millstone.'

CTDEP EPA Development Item Document Point Source No.

Discharge Category NNECO Response

6.

Low Volume Waste (Cont.)

Floor drains - floor drains In areas that are potentially contaminated with radioactivity are also routed to unit radwaste systems; non rad area floor drains are routed to various unit or yard drain discharges, with oil/water seperators provided for certain dischages (as shown on unit line diagrams)

Sanitary wastes - Millstone sanitary facilities are connected to the town of Waterford sanitary sewers Diesel engine cooling system discharge - diesel engines at Millstone are emergency" equipment, not "primary' power generators; these diesels are equipped with primary heat exchangers with a closed cooling waterzside, and open cooling water" side; the "open " side is supplied by a unit's service water system and is part of its discharge (i.e., 001A-5, 001B-5, 001 C-5 1

When a particular discharge serial number is cited, the specific information requested is presented in the corresponding line diagram, site plan and process description presented in the application attachments M, N, F and 0.

Ti 3

FaflM~td thornktaI and Ann. rnnn nmtknq fvflr nisamq CnnmtaInlnn I (r.1flflnl I C'- 17flf winrwwqvKRq n f'softwvnMfrsv LCS 1000 LCS 1200 Conquor 3565 Carbohydmzdeo

Flow, I % sodium toWW zle 0.5 % sodium tolyfflazteA 40 % Melhwwrylamine 3 % Dlaethylhydrnov1amin Pure Chemical volume/batch, Chemical Est BOD5 Chemical Est BOD5 Chemical Est BODS Chemical Est OD5 Chemical Eat BOD5 Discharge gallons Conc, mg/.

Cone, mg/I Cone., mg/.

Cone.. n/I Cone. mg/

Cone.. mg/L Cone., mg/I Cone, mg/

Conc, mg/L Cone, m/IL DSN 0O1A-2 12,000 c01

<1 1

<1 0.075

<1 DSN 001A4 3,500 c1

<1 I

<1.

0.075

<1 DSNO 1B-1(a) 70,000 175 e0 DSN00IC-1(a) 144.000 175 s0 SN 00IC-2 25.000 1

1 DSN OOIC-3 5.000.

30.

30 DSN 00IC4 80.000" I

11 11 DSN 001C6(b) 72,000 I

<1 0.075

<1 DSN 001C-S 30,000 30 30 DSN 005 Intermittent 60 60 I

<1 0.075

<1 DSN 006 Intermittent?

13 13 DSN 00S Intermittene s0 d0 I

1

<1 0.075

<1 A - Estima BODs bywelght I 100 percent based on theoretica oxygendemand (ftrom carbon and hydrogen) of 200 percent by welght and an assumed BODs to CODratioofO.5 B.Estimated BODs by weight Is75 percent based on theoretcal oxrygen demand (from carbon and hydrogen) of 150 percent by weight and an assumed BODO to COD ratio of 0.5 C

• Published valure Verschueren. Karel, Handbook of Environmental Data on Organic Chemicals, 2nd ed..Van Nostrand Reinhold Company. New York, 1983. p. 528 0 -Estimated BOO by weight Is 35 percent based on theoretil oxygen demand (from carbon and hydon) of 70 percent by weight and an assumed BODs to COD ratio of 0.5 E* Tle DSN 005 discharge volume Is Intermittent - the worst case concentration Is Included In the table above (discharge to quarry); estimated worst case batch volume of d1000 gals.

F - Assmes DSN 00o total fl of 150 gpm (50 % permlt max

)nd a batch dscharge ontalning LCS 1000 With aBODs of 60tn

) of 12000 gals.

over 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />s: 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> teverage would be < 5 notL (discharge to NMantlo Bay): The worst case BOD, concentration Is 60 mgtL based on no otherflows contributed to 006 at a partcular point In time.

o - The DSN 008 discharge volume Is Intermitent -the worst caseoncentrain Is Induded In the table above (discharge to Niant Bay); estmated worst case btch volume of 12000 gal.s H. Esftmated BODs contibuUon calculated using totaldischargebatch flown O6000 gasons, which contalns 30,000gallons of CCWsystemdrainage.

.N

I Table 4 Revised Unit Maxdmum Daily Flow Calculations Discharge Serial Pump rated Mmax Number Total daily Discharge Name Number flow, Gpm of pumps flow. mgd Unit i__

Circulating Water Pumps 105.000 4

604.8 Radiation Waste Sample Tank DSN 001A-1 NA NA 0.09 Fioor Drain Radiation Sample Tank DSN 001A-2 NA NA 0.036 Long Term Freon Distillation Unit DSN 001A-2(a)

NA NA 0.00022 Freon Distillation Unit DSN 001A-2(b)

NA NA 0.0065 Radiation Decontamination Solution Tank DSN 001A-4 NA NA 0.0105 Service Water Pumps DSN OOIA-5 12.000 4

69.12 Emergency Service Water Pumps DSN 00IA-5 2.600 4

14.4 Unit I Total Flow (DSN 001A)'

65923

• Unit2 COiculating Water Pumps 137.200 4

790.272 Steam Generator Wet Lay-up Drainage DSN 001B-1 (a)

NA NA 0.14 Steam Generator Slowdown DSN 001 B-1 NA NA 1.44 Aerated Waste Radiation Monitor Tank DSN 001B-2 NA NA 0.015 Steam Generator Chemical Cleaning DSN 001 B-2(a)

NA NA 0.06 Steam Generator Chemical Decontamination DSN 001B-2(b)

NA NA 0.03 Coolant Waste Radiation MonitorTank DSN 001B-3 NA NA 0.06 Service Water DSN 001B-5 12.000 3

51.84 Condensate PolisherWastewater DSN 0010-6 NA NA 0.075 HotweUl Discharge DSN 001i8 NA NA 0.2 Non-ContamInated Closed Cooling Water DSN 001B-9 NA NA 0.03 Stand Pipe DSN 001B-10 NA NA 0.15 Reador Building Closed Cooling Water Non-Contaminated Service Water DSN 001B-11 NA NA 0.15 Unit 2 Total Flow (DSN 0010) 844.46 Unit3 3l l

Circulating Water Pumps 153,000 6

• 1321.92 Steam Generator Slowdown DSN 001C-1 NA NA 1.4 Steam Generator Wet Lay-up Drainage DSN 001C-1(a)

NA NA 0.288 Radiation Waste Test Tank DSN 001C-2 NA NA 0.05 Low Level Radiation Waste Drain Tank DSN 001C-3 NA NA 0.02 Makeup Demineralizer Backwash DSN 001C-4 NA NA 0.077 Service Water DSN 001 C-5 15.000 4

86.4 Condensate PolisherWastewater DSN OO1C-6 NA NA 0.075 Steam Generator Chemical Decontamination DSN 001C-6(a)

NA NA 0.04 Auxiliary Boller Slowdown Sump DSN 001C-6(b)

NA NA 0.072 Condenser Hotwell Discharge DSN 001C-8 NA NA 0.1 Non-Contaminated Closed Cooling Water DSN 001C-9 NA NA 0.03 Unit 3 Total Flow (DSN 0OIC) 1410.472 Total All 3 Units (DSN 001-1) 2914.17 NA - Not Applicable mgd - million gallons per day gpm - gallon per minute Notes: 1 - Unit I Total Flow at DSN O0IA Is calculated as the sum of the dcrculang water pump flow.

DSN 001A-1 through DSN 001A-4. and 65 % of DSN 001A-5.

)

Appendix 5 Revised Table 7.11-1, Letter D17347 from G. Hicks to J.

Grier dated October 3, 2002 D17510

I REVISED TABLE 7.11-1. Summary of flow reduction alternatives and percent reduction in MPS cooling-water flow achieved relative to present two-unit and former three-unit operation (NPDES Permitted flow).

Unit 1 Unit 2 Unit 3 Station

% flow reduction

% flow reduction Descriptiona CWS SWS Tot CWS SWS Tot CWS SWS Total With Unit I shut down From permitted flow (gpm)

(gpm)

(gpm)

(gpm)

(gpm)

(gpm)

(gpm)

(%/0)

(%)

NPDES Permitted Flow 420,000 24,000 548,800 24,000 918,000 30,000 1,964,800 N/A N/A With Unit 1 shut down 0

0 504,000 24,000 918,000 30,000 1,476,000 N/A 23%

Single Unit Changes - Reduced Number of Operating CWPsb

=

Unit 3 - S CWPs 0

0 504,000 24,000 803,600 30,000 1,361,600 8%

31%

Unit3 - 4 CWPs 0

0 504,000 24,000 677,200 30,000 1,235,200

.16%

37%

Unit 2 - 3 CWPs 0

0 403,200 24,000 918,000 30,000 1,375,200 7%

30%

Single Unit Changes - Condenser By-pass, Throttling, or Variable Speed CWPs Unit 3 0

0 504,000 24,000 690,000 30,000 1,248,000 15%

36%

Unit 2 0

0 412,000 24,000 918,000 30,000 1,384,000 6%

30%

Combined Unit Changes - Reduced Number of Operating CWPs U3 -5 CWPs & U2 - 3 CWPs 0

0 403,200 24,000 803,600 30,000 1,260,800 15%

j 36%

U3 -4 CWPs & U2 -3 CWPs +

0 0

403,200 24,000 677,200 30,000 1,134;400 23%

j 42%

Combined Unit Changes - Condenser By-pass, Throttling, or Variable Speed CWPs I

Units 2 & 3 0

0 412,000 1 24,000 690,000 30,000 1,156,000 22%

l 41%

Natural Draft Cooling Towers I

Full Flow - Unit3 0

0 504,000 24,000 36,000 30,000 [594,000 60%

70%

2/3 Full - Unit3 0

0 504,000 24,000 333,000 30,000 891,000 40%

55%

Full - Unit 2 4.0l 26,000 24,000 918,000 30,000 998,000 32%

49%

Full - Units 2 & 3 01 01 26,000 24,000 1 36,000 30,000 [

116,000 92%

94%

Mechanical Draft Cooling Towers Full - Unit 2 0

0 24,000 24,000 918,000 30,000 996,000 33%

49%

Full - Unit 3 0

0 3 504,000 24,000 l 36,000 30,000 [

594,000 60%

70%

Full - Units 2 & U3 0

0 l 24,000 24,000 36,000 30,000 114,000 92%

94%

a CWS - circulating water system and SWS service water system.

b CWP = circulating water pumps.

3

Appendix 6 Addendum 5 to the NPDES Permit Renewal Application Revised Process Descriptions The following process descriptions have been updated and are included in this Appendix.

(Attachment 0 of Renewal Application)

)

(DSNs 001A-1, 001A-2, OOIB, OO1B-1, 001B-2, OO1B-2(a), OO1B-2(b),

001B-3, 001B-5, 001B-6, 001B-8, 001B-9, 001B-10, 001B-11, 003, 003A, 006, 001C, OO1C-1(a), OO1C-2, OO1C-3, OO1C-4, OO1C-5, OO1C-6, OO1C-6(b), OO1C-8, OO1C-9, 004, and EV)

The following process descriptions have not changed from Addendum 4:

DSNs 001-1, OOlB-1(a), OO1B-12, 001C-6(a), 011, 013, 017, 018, 020, 023, 024A, 025, 026, 028, 029, SMA-1, SMA-2, SMA-3, SMA-4 Revised Line Diagrams Also attached:

Revised Line Diagrams 3B and 13B Attachment M D17510

I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 00IA-I - UNIT I REACTOR CAVITY DECOMMISSIONING WASTEWATER (See Figure 1A)

This discharge is a batch discharge which may include:

Unit 1 Reactor Pressure Vessel Cavity Pool water Wastewater from maintenance activities, including decontaminating, disassembling, cutting, and/or removing components within the Reactor Pressure Vessel Cavity Pool (including incidental system leakage from underwater cutting equipment using diethylene glycol as the hydraulic fluid in the cutting equipment, estimated at <lppm)

Wastewater from incidental system leakage maintenance activities, including decontaminating, disassembling, cutting, and/or removing components within the Spent Fuel Pool Decontamination wash downs of walls and components which will remain in the Unit I Reactor Pressure Vessel Cavity Pool Unit 1 Spent Fuel Pool Unit 1 Spent Fuel Pool makeup (demineralized water)

Unit 1 Spent Fuel Pool cooling (demineralized water) e Unit 1 Reactor Building sumps Moisture Separator Pit Unit 1 Evaporator System storage tank (including wastewaters from DSNs OOIB-2, OOIB-3, OOlC-2 and 00IC-3 directed to this storage tank as an alternate pathway)

Domestic water Fire suppression system water Groundwater Flushings from decontamination of the Unit I Cleanup Filter Sludge Receiving Tank Flushings from decontamination of the Unit I Reactor Building Equipment Drain Tank Plant Makeup Water (demineralized water)

Cooling water from filtration skid processing pumps (either Plant Makeup or domestic water)

Sluice water from the top of the beds associated with the processing skid (either Plant Makeup Water or domestic water)

Sluice water from the bottom of the beds associated with the processing skid (either Plant Makeup Water or domestic water)

System leakage, maintenance activities, and incidental system leakage during operation and maintenance Roof drains Sample collection waste System drain downs Stack sump water Main stack ventilation duct water

I

) : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001 A UNIT 1 REACTOR CAVITY DECOMMISSIONING WASTEWATER (continued)

==

Description:==

This discharge will consist of approximately 500,000 gallons of Unit I decommissioning wastewaters from the Unit 1 Reactor Pressure Vessel Cavity Pool drain down and associated sources described above. Pressure washers utilizing demineralized water will be used to wash down the interior walls of the Reactor Pressure Vessel Cavity Pool. The Pool itself will be used as the "treatment tank" to process and recirculate the water within the Pool until it meets applicable discharge limits. A skid-mounted modular filtration processing system consisting of two independent parallel trains will be used to treat the water to remove radioactivity prior to discharge. The processing skid will be located on the refueling floor adjacent to the Reactor Pressure Vessel Cavity Pool. The treatment trains each consist of one 75 gpm processing pump and two 45 ft3 vessels containing granular activated carbon and mixed bed demineralizer resins, respectively. Downstream of the demineralizer vessels' discharge, the trains join and flow through in-line conductivity and pH meters.

Downstream from this instrumentation, a diverter valve allows for discharge back to the reactor pressure vessel cavity for additional processing and recirculation. The discharge is either continuously radiologically monitored or manually sampled in duplicate prior to discharge. Once processed, this water will be discharged via the previous DSN 001A-5 pathway (adjacent to the Unit 1 discharge tunnel) to the Quarry for co-mingling with DSNs 001B and 001C prior to discharge through DSN 001-1.

)

Alternate paths for this discharge include:

This discharge may be redirected to DSNs 001B-2 or 00113-3 as an alternate pathway.

Potential Chemicals in discharge:

• Domestic water constituents including residual chlorine and zinc

• Bulab 6002 (fire water additive for bio-fouling control)

• Decontamination washwater

• Filter additives Hydrogen peroxide for microbiological growth

• Flocculant

• Diethylene glycol

• Any chemical constituents present in DSNs 001B-2, 0013B-3, 001C-2 or 001C-3 Maximum daily flow: 150,000 gallons per day.

Sample Location: Immediately following treatment; sample tap off the effluent of the final in-line instrumentation

I I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge

)

Millstone Power Station Application Addendum No. S DSN 001 A UNIT 1 MISCELLANEOUS DECOMMISSIONING WASTEWATERS FROM SUMPS This discharge is a batch discharge which may include:

• MPI Spent Fuel Pool

• MPI Spent Fuel Pool Makeup (Demineralized Water)

• MPI Spent Fuel Pool Cooling (Demineralized Water)

• MP1 Reactor Building Sumps

• Unit I Evaporator System storage tank (including wastewater from DSNs 001B-2, 001 -B-3, 001 C-2, 001 C-3 directed to this storage tank as an alternate pathway.

• Flushings from decontamination of MPI plant components

• Plant Makeup Water

• Domestic Water

• Fire Suppression System water

• Groundwater

• Roof Drains

• Cooling water from processing pumps (either Plant Makeup or Domestic Water)

• Sluice water from the top of the associated beds (either Plant Makeup or Domestic Water)

• Sluice water from the bottom of the associated beds (either Plant Makeup or Domestic Water)

• System leakage, maintenance activities, and incidental system leakage during operation and maintenance

• Sample collection wastes

• System draindowns

• Stack sump water

• Main stack ventilation duct water

==

Description:==

This discharge will consist of miscellaneous Unit I wastewater collected in sumps which currently are being evaporated. The facility may want the flexibility to process and treat this wastewater and discharge it via the old DSN 001A-5 pathway to the Quarry. Unit 1 Miscellaneous Sump Wastewater from the sources described above are processed through a modular filtration skid system located on the refueling floor adjacent to the reactor pressure vessel cavity pool and consisting of two independent parallel trains. The trains consist of processing pumps, and two cleanup media filled vessels. Downstream of the demineralizer vessels' discharge, the trains join and flow through inline instrumentation. Downstream from the instrumentation, a diverter valve allows for discharge back to the tanks cavity for processing and recirculation. Once processed, the flow is directed through service water/emergency service water piping discharge (previously DSN 001A-5) to the outfall adjacent to the Unit One Circulating Water Discharge (DSN 001-A) then to the Quarry prior to discharge through DSN 001-1.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity

')

generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 A-2 -UNIT I MISCELLANEOUS DECOMMISSIONING WASTEWATERS FROM SUMPS (Continued)

Alternate paths for this discharge include:

This discharge may be redirected to DSNs OOIB-2 or OOIB-3 as an alternate pathway.

Potential Chemicals in discharge:

• Residual Chlorine (Domestic Water)

• Zinc (Domestic Water)

• Bulab 6002 (Fire water additive for bio-fouling control)

• Decontamination wash

• Filter additives

• Hydrogen Peroxide for microbiological growth

• Any chemical constituent present in DSNs OO1B-2, 001-B-3, OOIC-2, 001C-3 Maximum Flow per batch:

40,000 gallons per batch (based on 4 -10,000 gallon tanks present)

Number of batches/day: 1/day Sample Location:

Sample tap is off the effluent of the final inline instrumentation on the effluent of the processing skid.

}

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN OO1B - UNIT 2 CIRCULATING WATER (See Figure 2B)

This discharge is continuous and may include:

• Non-contact cooling discharge from Unit No. 2 main condensers.

• All upstream discharges having the description DSN OOIB-1 through OOIB-12 when they discharge.

• Maintenance activities discharges including intake desilting and dewatering

• Building roof drains

• Air conditioner and air compressor condensate drains

• System drainage and leakage, intake pump seal and domestic water, maintenance activities including hydrolazing, waterwashes, and incidental system leakage during startup, shutdown, operation, and maintenance.

• Fire suppression system flushes and drains

• Intake pipe and component drains from inspections & maintenance (service water & circ. water)

• Service water strainer backwash

• Cathodic and corrosion protection systems in use at the station, including at the intake structures, condenser waterboxes, and oil/water separators

==

Description:==

Unit No. 2 Discharge including DSNs OOIB-l through OOIB-12: Unit 2 condenser non-contact cooling water, intake pump seal and lubricating water, miscellaneous cooling water system leakage and drainage, hydrolazing, drainage of plant systems and components during start-up, shutdown, plant operation, intake desilting discharge, intake bay maintenance and dewatering activities, service water strainer backwash, incidental system leakage, and maintenance. The Unit 2 intake desilting wastewater is discharged to the circulating water tunnel either through the condenser pumps through the condenser or through other pipes to the seal well.

Four motor driven wet pit pumps rated at 137,200 gpm each pumps the water from the intake structure through the main (titanium) condenser and discharge into the quarry. Service water (at a rate of approximately 11 to 16 gpm) is used as bearing lube/seal water for the circulating water pumps. This system is equipped with a cathodic protection system. Certain components of the circulating and service water systems are epoxy coated. Contributing processes include screening and chlorination of Long Island Sound water (Niantic Bay).

The water is passed through an initial trash rack and four traveling screens located inside the intake structure.

The screens are designed to prevent debris larger than 3/8 inch from passing into circulating water pump, condenser and service water pumps. A sodium hypochlorite feed system capable of chlorinating circulating water on a shock treatment basis is provided.

The shock chlorination process consists of pumping hypochlorite into the intake bay between the intake structure trash racks and traveling screens via a diffusion pipe system. This process lasts for a maximum of two hours per day when it occurs. The circulating water chlorination system is capable of injecting sodium hypochlorite solution The traveling screen wash pump in the affected bay is secured (off) during shock chlorination to prevent chlorinated seawater from being discharged through DSN 003. Periodically, the hypochlorite injection system is flushed with domestic water to remove crystallized sodium hypochlorite.

The screen wash pumps use seawater for screen washing. In an emergency, fire water or domestic water may be used as screen wash water.

Discharge Information Response to Part A, Question 7-Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN GO1B - UNIT 2 CIRCULATING WATER (continued).

If necessary to prevent icing of the water in and around the intake structure, a portion of the circulating water (approximately 100,000 gpm from downstream of the condensers) is redirected into the intake bay through a pipe located at the intake structure. This procedure occurs very rarely.

Normal operating procedures include, as needed to maintain efficiency, the elevation of intake water temperature in each intake bay by a thermal backwash process for biofouling control. An ambient temperature backwash with intake water may be also be conducted to maintain efficiency. These condenser backflushes are performed to remove debris from the condenser tubes, waterbox tubesheets, and the inlets of the circulating water system. They last for short periods (5 to.10 minutes) and are normally performed during storm events (or shortly after) or following a thermal backwash, to remove debris from these areas. The backflush is accomplished by recirculating water within ode-half of a condenser by closing the condenser discharge valve, causing a flow reversal.

Service water strainer backwash is directed to an operating intake bay such that it is taken in by either an operating circulating water or service water pump.

Other maintenance activities at the intake structure include:

• General cleaning (washing down walls, floors, etc.). Domestic water and mild soaps are used for general cleaning. These wash waters are directed into the intake bay through floor drains.

General cleaning of the area adjacent to the intake structure. Domestic water is used to wash down the area and is discharged to the intake structure.

Potential Chemicals in discharge:

• Chlorine (free and total residual)

• Domestic water constituents including chlorine and zinc

• All other constituents and chemicals which may be present as identified in the process descriptions for DSN 001B-1 through DSN 001B-12.

• Bulab 6002 (Fire water additive for bio-fouling control)

• Service water piping epoxy coating erosion solids

• Seawater constituents

• Cathodic protection constituents Maximum daily flow:

844,550,000 gallons per day.

Sample Location:

Mouth of discharge tunnel OOIB, which feeds into quarry.

J

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001B-l - UNIT 2 STEAM GENERATOR BLOWDOWN AND BLOWDOWN OUENCH TANKS (See Figure 9B)

This discharge is continuous and may include:

• This discharge represents steam generator blowdown water sampled directly from the steam generators prior to concentration in the blowdown tank. Because of the loss of discharge volume in the blowdown tank caused by evaporation, the discharge is approximately 30 percent more concentrated than what is sampled. However, the corresponding mass discharge calculated based on flow and concentration at the sample location is accurate. The increase in concentration is balanced by this reduction in volume.

• This system also can receive effluent from steam generator wet lay-up drainage during maintenance activities (unit shutdown/startup), 00 lB-1 (a).

• Possible primary to secondary leakage (boric acid, lithium hydroxide).

• Chill water samples (during Unit operations from secondary sample sink) which may contain hydrazine and Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B &

D) or LCS 1200.

• Reagent chemicals (in-line ion chromatographs and sodium analyzers)

• TBCCW sample sink drain (which may contain hydrazine or LCS 1200)

• Deionized makeup water (may contain hydrazine during startup and shutdown).

• Secondary sample sink drains

• System leakage, drains, incidental system leakage, and maintenance activities during startup, standby operation, and shutdown.

• Sludge lancing

==

Description:==

There are two (2) steam generators in Unit 2. The maximum blowdown rate is 250 gpm per steam generator.

The steam generator blowdown and blowdown quench tank discharge consists of the condensate system, feedwater system, auxiliary feed, condensate storage tank, blowdown quench tank heat exchanger, and condensate surge tank. Also, this discharge includes steam generator draining, refilling and draining again.

during shutdown and refueling to speed cooling. The effluent from the quench tank and the blowdown tank discharge directly to the circulating water tunnel. A radiation monitor on the discharge line will isolate the discharge in the event of a radiologically contaminated discharge.

During normal operation, the entire blowdown is directed through the blowdown tank. This discharge also includes steam generator blowdown during startup hot standby, operation and shutdown. The discharge from the blowdown quench tank would consist only of the secondary sample sink drains (see Figure 9B) during normal operation. The discharge from the blowdown quench tank would by-pass the heat exchanger when only sample sink drains are entering the quench tank.

Alternate paths for this discharge include:

Steam generator blowdown quench tank maintenance drains can be redirected to DSN 001B-2 or 001B-3 as an alternate pathway.

Potential Chemicals in discharge:

Boric acid (from possible primary to secondary leak or for corrosion control).

• Ammonia

• Hydrazine

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001B UNIT 2 STEAM GENERATOR BLOWDOWN AND BLOWDOWN OUENCH TANK (Continued).

• Ethanolamine

• Carbohydrazide (not presently used)

• Domestic water constituents including chlorine and zinc

• Lithium Hydroxide (from possible primary to secondary leak)

• In-line ion chromatograph (ILIC) chemicals (including sodium tetraborate, hydrochloric acid with diaminoproprionic acid (about 2.5 liters/day from the anion system and 1.5 liters/day from the cation system.

• Monoethylamine from in-line sodium analyzer (Orion 1811)

• LCS 1200 (molybdate & tolyltriazole) (Potential hydrazine replacement in CCW systems)

• Conquor 3585 (methoxypropylamine & diethylhydroxylamine) (Potential hydrazine replacement in steam system)

Iron Reagent Chemicals for in-line ion chromatography (ILIC):

• sodium carbonate

• sodium bicarbonate

• sodium hydroxide

• p-cyanophenol sulfuric acid

• methane sulfonic acid

• tetrabutyl ammonium hydroxide

• acetonitrile

• methanol

• tetrahydrofuran

• pyrophosphoric acid Proposed Chemicals for Future Use:

• Dimethylamine

• Diaminopropane

• 2-Amino, 2-Methylpropanol

• 5-Aminopentanol

• 3-OH-Quinuclidine

• 3-Methoxypropylamine

• Diethylhydroxylamine

• N-isopropylhydroxylamine

• Diaminoethane

• Pyrrolidine Maximum daily flow: 1,440,000 gallons per day Sample Location: Turbine Bldg. sample tap for each steam generator, Aux. Bldg. primary sample room valves, or recirculation pump down skid sample valve.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001B-1(a) - UNIT 2 STEAM GENERATOR SECONDARY SIDE WET LAY-UP (See Figure JOB)

This discharge is an infrequent batch discharge which may include:

Steam generator drainage for maintenance.

Steam generator drainage for chemical control.

Steam generator sludge lancing drainage.

Steam generator secondary side lay-up treatment.

Steam generator start-up, hot standby, hot shutdown blowdown.

System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

==

Description:==

Steam generator wet lay up drainage for maintenance, plant start up and shut down, hot standby and shutdown, chemical control and sludge lancing.

Wet lay-up is performed on the secondary side steam generator to minimize corrosion of a steam generator internals. Wet lay-up is a condition where the steam generators are filled with water and may, or may not, contain elevated levels of hydrazine and ammonium hydroxide depending on the need to scavenge oxygen and control pH. Sometimes ethanolamine is added to wet lay-up to control pH. This chemical feed and drain is performed to maintain water chemistry control within the steam generators. Drainage to the blowdown tank is directed to the circulating water tunnel. System drains are performed when the unit is shutdown, during system maintenance or prior to start-up.

Also, during periods of start-up, hot standby, and hot shutdown, plant configuration prevents placement of the condensate polishers into the water feeding the steam generators. To maintain adequate corrosion protection, an elevated concentration of hydrazine is maintained in the steam generators (approximately 10 ppm). During the start-up, hot standby, and hot shutdown periods, a maximum of 250 gpm of blowdown is discharged. The blowdown typically contains about 10 ppm of hydrazine and about 3 ppm of ethanolamine. The start-up, hot standby, and hot shutdown periods may last for extended periods.

Alternate paths for this discharge include:

Steam generator wet lay-up can be directed to DSN 001B-1 during maintenance.

In the event of steam generator lay-up water becoming radiologically contaminated, steam generator lay-up may be directed to the containment sump and from there to either the aerated waste treatment system and discharged through DSN 00113-2 or to the clean liquid radioactive waste system and discharged through DSN 001B-3. This discharge can also be redirected to DSN 00113-6 as an alternate pathway.

Potential Chemicals in discharge:

Hydrazine (secondary side treatment)

Ethanolamine (secondary side treatment)

Domestic water constituents including chlorine and zinc Carbohydrazide (when used)

Ammonia (secondary side treatment)

Lithium hydroxide Boric Acid Conquor 3585 (methoxypropylamine & diethylhydroxylamine) (when used)

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 B-l (a) - UNIT 2 STEAM GENERATOR SECONDARY SIDE WET LAY-UP (Continued).

Suspended Solids Oil & Grease Copper, Lead, Nickel, Zinc, Iron Proposed Chemicals for Future Use:

Dimethylamine Diaminopropane 2-Amino, 2-Methylpropanol 5-Aminopentanol 3-OH-Quinuclidine 3-Methoxypropylamine Diethylhydroxylamine N-isopropylhydroxylamine Diaminoethane Pyrrolidine Max daily flow:

140,000 gpd.

)

Sample Location: Turbine Bldg. sample tap for each steam generator, Aux. Bldg. primary sample room valves, or recirculation/pumpdown skids sampling valves, or other representative sampling locations required as a result of equipment repair or maintenance activities.

Discharge Information Response to Part A, Question 7-Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001B UNIT 2 AERATED WASTE MONITOR TANK (See Figure 8B)

This discharge is a batch discharge which may include system leakage, drains, building drains, relief valve flows, maintenance activity wastewaters, and sumps located within the radiological controlled area, and collected in the aerated waste drain tank and includes:

Radiological building drains and sumps:

Tendon Access Pit.

Enclosure Building Sump.

Railroad Access Area Sump.

Reactor Building Closed Cooling Water (RBCCW) sump.

Auxiliary Building area sumps and drains (Refueling Water Storage Tank [RWST]

pipe sump and Enclosure Building sump).

Safety injection room sump.

Containment Building sump (refuel pool).

Clean Liquid Radwaste.

Coolant Waste Monitor Tank (including all sources described for DSN 001B-3).

Neutron Shielding Water Fire suppression system drains, maintenance drains and tests.

Inputs from DSN 001B-2(a) and 001B-2(b) during steam generator chemical cleaning or decontamination.

Hydrolazing (domestic or demineralized water).

RBCCW heat exchanger service water drains.

Turbine Building East and West Condenser Pit sumps if contaminated.

Radiologically contaminated closed cooling water (RBCCW with hydrazine).

Primary sample sink drains Health Physics Decon Facility wastewater containing soaps and detergents from personnel showers, sinks, and clothes washing.

Radiologically contaminated wastewater from any system/station process including primary side, secondary side, steam generator lay-up, seawater, and closed cooling water.

Groundwater in-leakage.

Spent Fuel Pool overflow and system leakage.

RWST from safety injection headers.

Domestic water, maintenance activities and incidental system drainage and leakage.

Chemistry Laboratory drains via the Auxiliary Building Drains.

Reactor coolant system drainage, incidental system leakage, and drainage from maintenance activities including hydrogen peroxide cleaning solution.

Unit 1 main stack chimney sump drain.

Service water system leaks/drainage.

Unit 1 decommissioning radiologically contaminated wastewaters (e.g., reactor cavity and separator pit wastewaters).

Main stack off-gas line sump drain Eye wash stations and showers Unit 1 waste evaporator system water Clean water washes or drains Feed Ring Header Drain

. I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001B UNIT 2 AERATED WASTE MONITOR TANK (continued).

Containment spray system Letdown pressure valves Pressurizer spray system Residual heat removal shutdown cooling Reactor water cleanup letdown system High and low pressure system injection for reactor coolant Unit 3 Aux. Boiler system leakage and drains from maintenance activities Steam generator blowdown Roof drains Plant makeup water (pure water)

Stack sump water

==

Description:==

Unit No. 2 Aerated Waste Radiation Monitor Tank Discharge including wastewaters from the containment building, other radiological controlled areas, Unit 1 decommissioning wastewaters, Turbine Building sumps and Coolant Waste Monitor Tank (OO1B-3) wastewater directed to DSN 001B-2 during startup, shutdown, operation, incidental system leakage and maintenance.

Also an alternate pathway for wet lay-up via a containment sump which is normally directed to DSN 001B-1(a). RBCCW that is normally directed to DSN GO1B-9 may be directed to this discharge via the RBCCW sump during maintenance activities, if radiologically contaminated, including service water and hydrolazing waters. DSNs 0O1A-1, 001A-2, 001B-2(a), 001B-2(b), 001B-9, OO1B-10 and 001B-1 1 may also be directed to this discharge as an alternate pathway.

Liquid wastes from the sources described above are collected by floor drains which discharge into one of two aerated waste drain tanks (AWDT). The system is designed for batch processing. Wastes are processed through pre-demineralizer filters and demineralizers. The demineralizer effluent is collected in the aerated waste monitor tank which is processed through an aerated waste final filter. Effluent is normally continuously radiologically monitored or manually sampled in duplicate prior to release. The discharge is pumped at a rate, selected over a range of 10 to 100 gallons per minute to the circulating water system, where it is comingled with the other inputs to DSN 00 1B.

Alternate paths for this discharge include:

The aerated -waste drain tank can be directed to either the coolant waste receiver or coolant waste monitor tanks and can be discharged through DSN 001B-3. Also, some inputs may be redirected to the Unit 1 Evaporator System storage tank that can be an input to DSN 001A-1 or 001A-2.

Potential Chemicals in discharge:

Boric acid Ammonia Hydrazine (sample sinks, RBCCW)

Ethanolamine (secondary side treatment)

Surfactants (HP Decon residuals)

Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B &

D) up to 200 ppb from chilled water system leakage Domestic water constituents including chlorine and zinc Iron, copper

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN ob1B UNIT 2 AERATED WASTE MONITOR TANK (continued).

Lithium Hydroxide Monoethylamine LCS 1200 (molybdate & tolyltriazole)

Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

Bulab 6002 (Fire water additive for bio-fouling control)

Any chemicals from discharges DSN 001B-1(a), OOIB-3, OO1B-9, OOIB-10, 001B-l and RBCCW from 001B-5 that may be directed to this discharge as an alternate path.

Gluteraldehyde (CCW biocide)

Oil & Grease Suspended solids Nalcolyte 7134 (polymer) or other coagulant Hydrogen Peroxide Seawater constituents Portable eye wash additive Proposed Chemicals for Future Use:

Dimethylamine Diaminopropane 2-Amino, 2-Methylpropanol 5-Aminopentanol 3-OH-Quinuclidine 3-Methoxypropylamine Diethylhydroxylamine N-isopropylhydroxylamine Diaminoethane Pyrrolidine Maximum Flow per batch:

Max flow per batch: 5,000 gal.

Max. flow per day: 15,000 gal/day Number of batches/day: variable.

Sample Location:

Sample valve in auxiliary building primary sample room or sample valves on recycle/mixing piping leg of discharge pump for aerated waste monitoring tank.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001B-2(a) -Unit No. 2 STEAM GENERATOR CHEMICAL CLEANING AND DSN 001B-2(b) CHEMICAL DECONTAMINATION

==

Description:==

Steam Generator chemical cleaning is performed on the secondary side of the steam generator to maintain steam generator internals.

Steam Generator chemical decontamination is performed on the primary side steam generator to reduce radiation levels.

Prior to performing chemical cleaning or decontamination of the steam generators Millstone would submit for the review and approval of the Commissioner an engineering report on the proposed process, chemicals potentially present, discharge volumes and schedule of implementation.

Alternate paths for this discharge include:

This discharge could potentially be directed to the Clean Liquid Radwaste System and discharged through DSN 001B-3, or directed to DSN 001B-2. Information for this alternative, if selected, to be provided in the engineering report described above.

Potential Chemicals in discharge:

Information to be included in report described above.

Maximum Daily Flow: Information to be included in report described above.

Sample Location:

Immediately following treatment.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity N

generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIB UNIT 2 COOLANT WASTE MONITORING TANK (See Figure 7B)

This is a batch discharge which may include:

Reactor coolant water from the letdown system Equipment drains, relief valve flows, system leakage and vents Spent resin tank dewatering overflow Steam generator wet lay-up drainage (if radiologically contaminated).

Aerated Waste Drain Tank (including sources described for DSN OOIB-2).

Reactor coolant system (RCS) quench tank.

Wastewater from containment building sumps.

Service water system leaks/drainage.

System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

Primary Drain Tank and Drainage from the Equipment Drain Tank Sump.

Neutron Shielding Water Steam Generator Blowdown Quench Tank vents to gaseous radwaste system - liquid goes to DSN 00IB-3.

Reactor coolant system drainage, incidental system leakage, and drainage from maintenance activities including hydrogen peroxide cleaning solution.

Eye wash stations and showers Fire suppression system drains and testing Chemistry Laboratory drains via the Auxiliary Building Drains.

Primary water system drains.

Residual heat removal shutdown cooling Reactor water cleanup letdown system High and low pressure system injection for reactor coolant Clean water washes or drains.

Unit 3 Aux. Boiler system leakage and drains from maintenance activities Steam generator blowdown Groundwater in-leakage and roof drains Domestic water Stack sump water

==

Description:==

Wastewater from the auxiliary and reactor coolant building sumps, aerated waste monitoring tanks, aerated waste drain tanks collected in the coolant waste monitoring tank, Unit 1 decommissioning wastewaters, and other radiological controlled areas during plant startup, operation, shutdown, incidental system leakage and maintenance. As an alternate pathway, steam generator blowdown and wet lay-up may be redirected from DSNs 001B-1 and OO1B-1(a) and the aerated waste drain tank may be redirected from DSN 0O1B-2. Also, DSNs OO1A-I, OOIA-2, OOIB-2 (a), OOIB-2(b), OOIB-9, and OOIB-Il may be directed to this discharge as an alternative pathway.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 00113 UNIT 2 COOLANT WASTE MONITORING TANK (Continued).

The Clean Liquid Radioactive Waste processing system is designed for the processing of Reactor Coolant system (RCS) waste concurrent with the letdown flow from the Chemical and Volume Control System (CVCS). Reactor coolant is diverted to this system from the CVCS when changes in the RCS inventory or boron concentration are necessitated by Unit startups, shutdowns, and refueling. The equipment area drains and associated systems are treated using a filter to reduce insoluble particulates.

)

The liquid waste is then processed through one of two primary demineralizers. Demineralizer effluent flows to one of two coolant waste receiver tanks. The two receiver tanks provide storage for liquid wastes. The contents of the coolant waste receiver tanks are processed through an optional three-stage filter train during periods of high waste activity. One filter contains activated charcoal media for improved cobalt removal. The second filter contains a coarse media cartridge and the third filter contains a fine media cartridge. Each filter has a bypass to allow removal from the process when not required based on waste chemistry. The effluent of the three-stage filter train will be able to be aligned to a pair of proposed test demineralizer vessels. These demineralizers are able to be aligned for the purpose of testing improved resin media prior to installing larger primary or secondary demineralizer vessels. The wastewater will then enter a pair of secondary demineralizer vessels. One secondary demineralizer contains a mix bed and the other is loaded with ion specific resin based on water chemistry.

These demineralizers can be operated independently or in series as a method of optimizing the processing cycle. The effluent from the secondary demineralizers can either be returned to the receiver tanks to further polish the wastewater or directed to the coolant waste monitor tanks. Prior to discharging to the circulating water tunnel, the effluent is sampled and processed through a coolant waste final filter. Radiation monitoring is performed prior to discharge. If sampling indicates further processing is required to meet Millstone Administrative discharge goals, the effluent can either be directed back to the receiver tanks or monitor tanks.

Alternate paths for this discharge include:

The coolant waste monitor tank can also be pumped to the Aerated Waste Drain Tank and discharged through DSN 001IB-2. Also, some inputs may be redirected to the Unit 1 Evaporator System storage tank that can be an input to DSN 001A-1 or 001A-2.

Potential Chemicals in discharge:

Boric acid Ammonia Hydrazine Ethanolamine (secondary side treatment)

Surfactants (HP Decon residuals)

Freon (R22. chlorodifluoromethane or other future refrigerants not listed in 22a-430-3. Appendix B &

I 6

0 D) up to 200 ppb from chilled water system leakage Domestic water constituents including chlorine and zinc Lithium Hydroxide Monoethylamine Ammonium hydroxide (secondary side treatment)

Carbohydrazide LCS 1200 (molybdate & tolyltriazole)

Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

Bulab 6002 (Fire water additive for bio-fouling control)

Discharge InforiiAtion Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN001 B UNIT 2 COOLANT WASTE MONITORING TANK (Continued).

Iron, copper Arsenic Oil & Grease Nalcolyte 7134 (polymer) or other coagulant Hydrogen Peroxide Seawater constituents Portable eye wash additive Suspended Solids Proposed Chemicals for Future Use:

Dimethylamine Diaminopropane 2-Amino, 2-Methylpropanol 5-Aminopentanol 3-OH-Quinuclidine 3-Methoxypropylamine Diethylhydroxylamine N-isopropylhydroxylamine Diaminoethane Pyrrolidine Maximum Flow per batch:

Max. flow per batch: 30,000 gal.

Max. flow per day: 60,000 gal/day Number of batches/day: variable.

Sample Location: Sample valve in auxiliary building primary sample room on discharge piping of coolant waste tank(s) discharge pump.

) : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 B UNIT 2 SERVICE WATER. AUX. HEAT EXCHANGER (See Figure 2B)

This is S

0 a continuous discharge which may include:

Non-contact auxiliary heat exchanger service water (seawater) which is continuously chlorinated.

Fire water and service water system drains are other sources to this discharge.

System leakage and maintenance.

Firewater Pump lubricant and seal water System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

Washwater during hydrolazing activities.

Domestic water.

Service water strainer backwash directed to the intake structure between travelling screens and circulating water pumps.

0 0

a

==

Description:==

Service Water discharge, including pump lubrication water, pump seal water, hydrolazing wastewater, circulating water and service water system drainage during startup, shutdown, plant operation, incidental leakage, and maintenance.

This system is a Nuclear Safety Related system. The service water system provides cooling water to the Reactor Building Closed Cooling (RBCCW); Turbine Building Closed Cooling (TBCCW); and diesel engine cooling water, chilled water system heat exchangers, vital switch gear room cooling coils, circulating water pump bearing water, and supplies dilution flow to the sodium hypochlorite system. Two service water pumps (rated at 12,000 gpm each) are located within the intake structure and take suction from and discharge to Long Island Sound (Niantic Bay). A third service water pump is available as a backup. Sodium hypochlorite solution is continuously injected to the service water pump suction. Periodically, the hypochlorite injection system is flushed with domestic water to remove crystallized sodium hypochlorite. The service water pumps continuously use chlorinated service water for seal/bearing lubrication. Fire water can be used instead of service water for the emergency diesel generator heat exchanger during an emergency. Chlorination is shut off during backwash of service water strainers.

Alternate paths for this discharge:

Service water from the TBCCW heat exchanger draining can be directed to DSN OOIB-10 during maintenance activities.

Service water from the RBCCW sump can be directed to DSN 001B-2 (if radiologically contaminated) or 0011B-1 I (if not radiologically contaminated) during maintenance activities. Service water from the TBCCW heat exchanger normally directed to DSN OOIB-5 can be redirected to DSN OO1B-9.

Potential Chemicals in discharge:

• Chlorine (free and total residual)

• Domestic water constituents including chlorine and zinc

• system chemicals from heat exchanger leakage including Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a430-3, Appendix B & D)

• Bulab 6002 (Fire water additive for bio-fouling control)

Maximum Flow:

51,840,000 gallons per day.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIB UNIT 2 SERVICE WATER, AUX. HEAT EXCHANGER (Continued)

Sample Location: Turbine Bldg. Closed cooling heat exchangers sample valve, Reactor Bldg. heat exchangers service water discharge piping manifold sampling valve, emergency diesel service water line sampling valve, or Aux. Bldg. Service water sample valves.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN GOIB UNIT 2 CONDENSATE POLISHER (TK 10&1 1)

(See Figure 6B)

Discharges from Unit 2's TK 10 & 11 that may include:

• Condensate Polishing Facility System floor drains, vents, incidental system leakage, maintenance activity wastewaters, and relief valve discharges.

• Condensate polisher resin regeneration wastewater which may contain hydrazine, ethanolamine, ammonia, neutralized sulfuric acid, and sodium hydroxide, and other amines and reducing agents in the future as described below.

• Plant equipment wash water (domestic water with detergents/surfactants/steam cleaning)

• Domestic water from recirculation and discharge pump, and Fan No. I sealwater.

• Domestic water used to perform hydrostatic tests of plant components.

• Potential discharge from safety showers/eyewash stations (domestic water).

• Boric acid (steam generator treatment)

• Condenser pit sumps (alternate discharge location for these sumps).

• CPF elevator sump

• Condensate system polishers

• Fire water drains

• Recovered water tank and sump and resin dewatering water

• Spent resin tank sump

• Regeneration system tank drains, vents, overflow

• Air conditioner and air compressor condensate drains

• Condenser pit sumps GAC filter backwash.

• Four (4) waste evaporator feed tanks (14,000-gallons each)

• CPF demineralizers drains to CPF floor drains.

• CPF tank (acid/caustic) drainage resulting from system inspection rinse water and drains as part of tank maintenance to TK 10/11 via floor drains.

• Steam extraction line drains to floor drains to TK 10/11.

• Heater drains, aux. feedwater and condensate system drainage

• Clean water washes or drains.

• Seawater

==

Description:==

Unit 2 condensate polishing facility operation including system area floor drains, vents, incidental leakage, and maintenance activity wastewater, resin regeneration and drain wastewater, condensate system polisher wastewater, fire water, waste evaporator feed tank water, service water (seawater), Unit 3 auxiliary boiler system steam and drainage from condensate recovery tank, domestic water, hot water heating system drainage, plant equipment domestic water washwater, feed water and condensate system drainage (secondary system) and blowdown, air conditioner and air compressor condensate drains, condenser pit sumps, condenser pit sumps GAC filter backwash, steam generator drainage from wet lay-up during startup, shutdown, plant operation, and incidental system leakage, and maintenance. This discharge is essentially a "batch" discharge; however, some of the minor inputs are continuous. Continuous inputs include domestic water inputs from pump and fan seal water and sample sink drains. These inputs constitute minimal flow (less than 1%/per hour of tank volume, i.e., less than 250 gallons).

) : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001B UNIT 2 CONDENSATE POLISHER (TK 10&11) (continued).

During normal power operations, full condensate system flow is directed through the condensate demineralizers. The condensate demineralizers removes impurities from condenser tube leakage, primary to secondary leakage, and the corrosion of condensatelfeedwater system piping and components.

The Condensate Polishing Facility (CPF) waste neutralization sumps (TI O & 11) are lined with a chemically-resistant ceramic brick liner and have a capacity of 25,000 gallons each. The sumps are primarily used to receive waste water associated with resin cleaning and the regeneration process. The CPF consists of seven service vessels and eight resin charges. During plant operations six of the vessels are in service. The seventh service vessel and resin charge are in standby; the eighth resin charge is being cleaned and regenerated. Each charge consists of approximately 80 cubic feet of cation resin and 120 cubic feet of anion resin. Flow through each service vessel is a nominal 3,000 gallons per minute. The influent water contains residual ethanolamine, ammonia and hydrazine.

The polishers are operated until the resin effluent shows an increase in amine concentration and specific conductivity. The exhausted charge is then transferred to the regeneration room where it is cleaned and the resins are regenerated using sulfuric acid (cation) and sodium hydroxide (anion).

Regeneration waste waters (including transfer, cleaning, regeneration, rinse and soak) are neutralized prior to discharge to Long Island Sound. Hydrazine treatment is practiced utilizing air sparging and/or hydrogen peroxide addition in Tanks 10 and 11.

Alternate paths for this discharge include:

This discharge can also be directed to Unit 3 via the CPF liquid radwaste system and discharged through DSN OOIC-6. DSN OOIB-1(a) can also be directed to this discharge as an alternate pathway.

)

Pot 0

0 0

0 S

S 0

0 S

0 S

0 S

S ential Chemicals in discharge:

Boric acid Hydrazine Sulfuric acid and sodium hydroxide (pH adjustment, resin regeneration, and hydrazine treatment)

Oil and Grease Ethanolamine Carbohydrazide Ammonia Lithium hydroxide Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B & D) up to 200 ppb from chilled water system leakage Domestic water constituents including chlorine and zinc Surfactants from equipment washes Hydrogen peroxide (hydrazine treatment)

Bulab 6002 (Fire water additive for bio-fouling control)

Copper Iron Cadmium Chromium Lead Nickel Zinc Suspended Solids Seawater constituents

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIB UNIT 2 CONDENSATE POLISHER (TK 10&11) (continued).

• Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

• LCS 1200 (molybdate & tolyltriazole)

• Reagent wastes from in-line instrumentation Proposed Chemicals for Future Use:

• Dimethylamine

• Diarninopropane

• 2-Amino, 2-Methylpropanol

• 5-Aminopentanol

• 3-OH-Quinuclidine

• 3-Methoxypropylamine

• Diethylhydroxylamine

• N-isopropylhydroxylamine

• Diaminoethane

• Pyrrolidine Maximum Flow per batch:

Max flow per batch: 25,000 gal.

Max. flow per day: 75,000 gal/day Number of batches/day: variable.

Sample Location: Sampling valve in the Condensate Polishing Facility on the filter outlet.

i

I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001B UNIT 2 CONDENSER HOTWELL DISCHARGE (See Figure 5B)

This is an infrequent batch discharge: however, under certain operating conditions may be discharged continuously during start-up or automatic shutdown of the Unit. This discharge may include:

Feedwater heater lay-up drains performed during maintenance Condensate and feedwater system leakage and drainage.

Extraction steam High temperature feedwater heater shell drainage.

Condensed steam

==

Description:==

Condensate and feed water system drains during Unit 2 outages, secondary system drainage including wet lay-up and turbine building drains during startup, shutdown, plant operation, incidental system leakage and maintenance activities including hydrolazing.

The condenser hotwell collects condensed steam for recycle and re-use in the steam generators.

The condensate accumulates in the two condenser hotwells (A and B) where it is pumped to the condensate polishing facility (CPF) and then pumped into the feedwater system. Hotwell system chemical (hydrazine and ethanolamine) feed and drains are performed to maintain water chemistry, usually at startup or shutdown.

Deionized water is used as makeup water for the system. Hotwell discharges are sampled prior to discharge via DSN OOIB-8.

Alternate paths for this discharge include:

The hotwell can also be drained to the east condenser pit sump and discharged to DSN OOIB-10. This discharge can also be redirected to DSN OOIB-9.

Potential Chemicals in discharge:

Hydrazine Ethanolamine Ammonia Carbohydrazide Boric Acid Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

LCS 1200 (molybdate & tolyltriazole)

Iron, copper Oil & Grease Suspended Solids Freon up to 200 ppb

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001 3 UNIT 2 CONDENSER HOTWELL DISCHARGE (continued)

Proposed Chemicals for Future Use:

Dimethylamine Diaminopropane 2-Amino, 2-Methylpropanol 5-Aminopentane 3-OH-Quinuclidine 3-Methoxypropylamine Diethylhydroxylamine N-isopropylhydroxylamine Diaminoethane Pyrrolidine Maximum Flow:

Maximum daily flow: 200,000 gpd.

Number of batches per day: variable Maximum flow per batch: 100,000 gallons Sample Location: Sample valves on the discharge piping of the condensers or sample valves on the discharge piping of the condensate pumps.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001 B UNIT 2 CLOSED COOLING WATER (TBCCW. Chill Water and RBCCW)

(See Figure 3B, 4B and 15B)

This is an infrequent batch discharge which may include:

Reactor Building Closed Cooling Water (RBCCW) system drains and leakage (hydrazine).

Chilled Water (hydrazine) drainage and leakage.

Turbine Building Closed Cooling Water (TBCCW) (hydrazine) drainage and leakage.

Maintenance activities and incidental system leakage.

Service water system leakage and drains.

Domestic water Clean water washes or drains

==

Description:==

Unit No. 2 Closed Cooling Water System Drainage: Turbine building, reactor building closed cooling water drainage, chilled water system drainage, hydrolazing wastewaters, domestic water, demineralized water, service water and incidental system leakage during startup, shutdown, plant operation, and maintenance.

DSNs 001B-5, 001B-8 and 00IB-I I can be redirected to this discharge as an alternate pathway.

Reactor Building Closed Cooling (RBCCW)

(See Figure 3B)

The RBCCW system consists of two independent headers, each including one motor driven RBCCW pump, one RBCCW heat exchanger, with a shared RBCCW surge tank. A third RBCCW pump and heat exchanger is provided as a spare for the system. The RBCCW is cooled in the RBCCW heat exchangers by service water (seawater). Demineralized water is used for makeup water and comes from the primary water storage tank.

Makeup water is supplied to the RBCCW surge tank. Hydrazine can be injected into the RBCCW system to increase the corrosion inhibitor concentration during normal operations.

External leaks and drains are collected by the drains system and processed through the radwaste processing system. Relief valves are discharged to auxiliary building sumps.

Turbine Building Closed Cooling Water (TBCCW)

(See Figure 4B)

The TBCCW system provides cooling water to the auxiliary equipment located in the Turbine Building. The TBCCW system removes heat from the turbine components and sample coolers. The system transfers the heat to the service water system in the TBCCW heat exchangers (3). During normal operation two pumps and two heat exchangers are operating. The third heat exchanger and pump would operate upon failure of an operating pump or heat exchanger or during times of high service water temperatures. The system has a surge tank and a hydrazine feed tank where chemical additions are made to maintain water chemistry. The components cooled by the TBCCW system are shown on Figure 4B. TBCCW is drained during maintenance to the condenser pit sumps through the turbine building floor drains and pumped to the seal well via the 16-inch standpipe. The TBCCW can also be drained directly to the 16-inch standpipe (DSN OOIB-10).

Discharge Information Response to Part A, Question 7 - Description of specific process or activity

)>

generating discharge Millstone Power Station Application Addendum No. 5 DSN 00113 UNIT 2 CLOSED COOLING WATER (TBCCW. Chill Water and RBCCW) (continued).

Chilled Water System (See Figure 15B)

Chill Water is used to provide cooling for the vital and non-vital chillers which provide cooling for the cable vault recirculation unit, the DC switch gear room a/c units, the access control area a/c unit and the control room a/c unit (retired in place). The system has a surge tank and a hydrazine feed tank where chemical additions are made to maintain water chemistry. Chilled water is drained during maintenance to the condenser pit sumps through the turbine building floor drains and pumped to the seal well via the 16-inch standpipe.

Alternate paths for this discharge include:

The chilled water drainage can also be drained directly to the 16-inch standpipe (DSN 0011-10). There are several alternative discharge locations for the RBCCW sump and the condenser pit sumps. These discharge locations are described on Figures 3B and 4B for this discharge. Also refer to Figures 1I B through 13B for all alternative discharge locations for these sumps. These alternate discharge locations include DSNs 001B-2 and 001B-3 (if radiologically contaminated) and OOIB-A1 for TBCCW heat exchanger (service water side) drainage, maintenance and hydrolazing wastewater (not radiologically contaminated). The turbine building condenser pit sumps normally discharge to DSN 006 but can be directed to either DSN 001B-6 or DSN O01B-2/001B-3.

Non-radiologically contaminated RBCCW heat exchanger (service water side) drainage, maintenance and hydrolazing wastewater which is drained to the RBCCW sump are directed through a total

)

suspended solids reduction filter prior to discharge to the circulating tunnel as described in Figure 13B.

Potential Chemicals in discharMe:

• Domestic water constituents including chlorine and zinc

• Demineralized water

• Hydrazine (RBCCW, TBCCW and Chilled Water Systems)

• Ammonia (breakdown of hydrazine)

• Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B & D) up to 200 ppb from chilled water system leakage

• Carbohydrazide

• LCS 1200 (molybdate and tolyltriazole) (potential for use in RBCCW, RBCCW and Chilled Water Systems)

• Conquor 3585 (methoxypropylamine and diethylhydroxylamine)

• Ethanolamnine

• Bulab 6002 (Fire water additive for bio-fouling control)

• Lithium hydroxide Maximum Flow: 30,000 gallons per day Sample Location: Sample valves for reactor or turbine building sample sink, ef turbine building closed cooling water heat exchangers sample valves, reactor building closed cooling water heat exchangers sample valves, chilled water heat exchanger sample valves, or chill water pump discharge sample valves.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIB 16-inch STANDPIPE DISCHARGE TO CIRCULATING WATER TUNNEL (Figure 12B)

Unit No. 2 - 16 inch standpipe discharge to the circulating water tunnel including Unit No. 2 feedwater heaters shell and tube side drains, water box priming pumps, groundwater leakage, circulating water leakage, alternate pathway for the redirection of DSN OO1B-8 (condenser hotwells), DSN OOIB-5, and DSN OOIB-9 (TBCCW and chill water drainage) auxiliary feed water pump room sump discharge, floor drains, turbine building closed cooling water, chilled water, de-icing pit sump, condenser pit sumps, mechanical vacuum pumps, secondary sample sink cooling water, auxiliary steam and condensate recovery, incidental system leakage during startup, shutdown, plant operation, and maintenance, seal water and hydrolazing wastewater.

This discharge is an alternate discharge location for several sources currently permitted to be discharged through other locations. This discharge may include:

• Steam condensate

• Service water

• Rain water

• Stator cooling water

• Feedwater heaters shell & tube side drains

• Water box priming pumps (domestic water)

• Ground water leakage N)

Circulating water leakage

• Condenser hotwells (DSN OOIB-8 alternate discharge)

• Auxiliary Feed Water Pump Room Sump. discharge

• Floor drains

• Turbine Building Closed Cooling Water (TBCCW) during maintenance (DSN OOlB-9 alternate discharge)

• Chilled Water drainage during maintenance (DSN OOIB-9 alternate discharge)

• De-icing pit sump

• Condenser Pit sumps

• Mechanical vacuum pumps (domestic water) seal water

• Secondary sample sink cooling water (domestic water)

• Firewater and firewater used as emergency cooling water for instrument air compressor.

• System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown

• Feed and condensate drains from plant start-up, shutdown and maintenance

• Clean water washes or drains

• Building maintenance washwater

• Waterbox drains, incidental system leakage and maintenance activities Alternate paths for this discharge include:

This discharge may be redirected to DSN OOIB-2 as an alternate path if radiologically contaminated.

I r : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 00IB 16-inch STANDPIPE DISCHARGE TO CIRCULATING WATER TUNNEL (continued)

Potential Chemicals in discharge:

Hydrazine

• Ethanolamine

• Boric Acid

• Ammonia

• Domestic water constituents including chlorine and zinc

• Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B & D) up to 200 ppb from chilled water system leakage

• Bulab 6002 (Fire water additive for bio-fouling control)

• Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

• Carbohydrazide

• LCS 1200 (molybdate & tolyltriazole)

• Iron and Copper Oil & Grease

• Suspended Solids

• Surfactants Proposed Chemicals for Future Use:

• Dimethylamine

• Diaminopropane 2-Amino, 2-Methylpropanol 5-Aminopentanol

• 3-OH-Quinuclidine

• 3-Methoxypropylamine

• Diethylhydroxylamine

• N-isopropylhydroxylamine

• Diaminoethane

• Pyrrolidine Maximum Flow:

150,000 gal/day.

Sample Location: Dip sample of discharge water from the turbine building sump.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN OOIB-l I - UNIT 2 RBCCW AREA SUMP (Figure 13B)

Unit No. 2 service water drainage and incidental system leakage from the reactor building closed cooling water system (RBCCW) system (normally directed to DSN OOIB-5) (if not radiologically contaminated),

hydrolazing wastewater, floor drains, domestic wash water, RBCCW relief valve discharges and auxiliary building sumps during startup, shutdown, plant operation, and maintenance.

Also, DSN OOIB-9 can be directed to this discharge as an alternate pathway.

This is the discharge location for the RBCCW sump discharged to the circulating water tunnel and includes the following if not radiologically contaminated:

• Service water (chlorinated seawater) drained from the RBCCW system to the RBCCW sump

• Hydrolazing wastewater (filtered with a TSS filter)

• Floor Drains

• Reactor Building Closed Cooling Water relief valve discharges

• System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

• Railroad Access area sump.

• Fire water system drains and testing

• Groundwater

• Clean water washes or drains Unit 3 Aux. Boiler system leakage and drains from maintenance activities

• Plant makeup water (pure water)

• Roof drains This is a potentially continuous discharge when the RBCCW system is being maintained. The sump is sampled prior to initiating this discharge and daily while the discharge is occurring.

Alternate paths for this discharge include:

If the RBCCW sump is contaminated, it is directed to the Aerated Waste Treatment system (DSN OOIB-2) or Coolant Waste Treatment system (DSN OOIB-3) (see Figure 8B). This discharge can also be directed to DSN OOIB-9 as an alternate pathway.

Potential Chemicals in discharge:

• Hydrazine

• Ethanolamine Boric Acid Ammonia

• Domestic water constituents including chlorine and zinc

• Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a430-3, Appendix B & D) up to 200 ppb from chilled water system leakage Bulab 6002 (Fire water additive for bio-fouling control)

Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

• Carbohydrazide

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001B-l I - UNIT 2 RBCCW AREA SUMP (continued)

• LCS 1200 (molybdate & tolyltriazole)

• Surfactants

• Bulab 6002 (Fire water additive for bio-fouling control)

Oil & Grease

• Suspended Solids Proposed Chemicals for Future Use:

• Dimethylamine

• Diaminopropane

• 2-Amino, 2-Methylpropanol

• 5-Aminopentanol

• 3-OH-Quinuclidine

• 3-Methoxypropylamine Diethylhydroxylamine

• N-isopropylhydroxylamine

• Diaminoethane

• Pyrrolidine Maximum Flow:

150,000 gal/day.

Sample Location: Auxiliary Building sump.

, I : Discharge Informnation Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 003 - UNIT 2 SCREEN WASHWATER DISCHARGE (alternate pathway for DSN 003A)

(See Figure 2B)

Unit No. 2 Screen Washwater Discharges, including non-chlorinated seawater taken from the intake used to wash down the traveling screens in all intake bays, and domestic water from wash downs and hydrolazing activities, domestic water used as bearing lube water for screenwash pumps, system leakage and maintenance activities during startup, operation and shutdown, screen wash strainer backwash, intake desilting wastewaters, service water pump header discharge and strainer backwash, and fire water used in an emergency to clean the travelling screens. These discharges are normally directed to the Unit 2 fish return (DSN 003A) through the fish and invertebrate return trough.

This discharge may include:

• Unit 2 Traveling screen wash water (seawater) and re-directs some of the materials collected (e.g., debris and fish) on the traveling screens to Niantic Bay through the trash basket.

• Firewater used in an emergency to clean the traveling screens

• Domestic water

• System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

• Hydrolazing wastewaters

• Clean water washes or drains.

• Cathodic and corrosion protection systems in use at the station, including at the intake structures, condenser waterboxes, and oil/water separators An above ground pit adjacent to the intake structure is used to clean the trash basket of debris (e.g. seaweed).

Domestic water and/or low pressure air are used to clean the debris from the trash basket. This wash water is directed to DSN 003A through a trough adjacent to the pit. However, these discharges are directed to DSN 003 as an alternate pathway.

During normal maintenance of the intake, washdown and power washing activities occur in the area adjacent to the intake structure. This wash water drains through DSN 003A or 003. In addition, the intake bays are occasionally desilted. The debris which collects in the intake bay (mussels, dirt, etc.) is pumped out to a strainer basket in an above ground container located next to the intake structure. The water which passes through the strainer basket is discharged through DSN 003A or 003. The material collected in the basket is taken off-site.

Potential Chemicals in discharge:

• Domestic water constituents including chlorine and zinc

• Bulab 6002 (Fire water additive for bio-fouling control)

• Seawater constituents Oil & Grease

• Cathodic protection constituents Maximum Daily Flow 3,888,000 gpd Sample Location: Service water strainer sample stop valves LIA, LiB and LIC.

. I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 003A - UNIT 2 FISH RETURN SLUICEWAY (See Figure 2B)

Unit No. 2 Screen Washwater Discharges, including non-chlorinated seawater taken from the intake used to wash down the traveling screens in all intake bays, and domestic water from wash downs and hydrolazing activities, domestic water used as bearing lube water for screenwash pumps, system leakage and maintenance activities during startup, operation and shutdown, screen wash strainer backwash, intake desilting wastewaters, service water pump header discharge and strainer backwash, and fire water used in an emergency to clean the travelling screens. These discharges are normally directed to the Unit 2 fish return (DSN 003A) through the fish and invertebrate return trough.

This discharge may include:

• Unit 2 Traveling screen wash water (seawater) and re-directs some of the materials collected (e.g., debris and fish) on the traveling screens to Niantic Bay through the trash basket.

• Firewater used in an emergency to clean the traveling screens

• Domestic water

• System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

H* ydrolazing wastewaters

• Clean water washes or drains.

• Cathodic and corrosion protection systems in use at the station, including at the intake structures, condenser waterboxes, and oil/water separators An above ground pit adjacent to the intake structure is used to clean the trash basket of debris (e.g. seaweed).

Domestic water and/or low pressure air are used to clean the debris from the trash basket. This wash water is directed to DSN 003A through a trough adjacent to the pit. However, these discharges are directed to DSN 003 as an alternate pathway.

During normal maintenance of the intake, washdown and power washing activities occur in the area adjacent to the intake structure. This wash water drains through DSN 003A or 003. In addition, the intake bays are occasionally desilted. The debris which collects in the intake bay (mussels, dirt, etc.) is pumped out to a strainer basket in an above ground container located next to the intake structure. The water which passes through the strainer basket is discharged through DSN 003A or 003. The material collected in the basket is taken off-site.

Alternate paths for this discharge include:

As an alternate pathway, this discharge can be directed to DSN 003.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 003A - UNIT 2 FISH RETURN SLUICEWAY (Continued)

Potential Chemicals in discharge:

• Domestic water constituents including chlorine and zinc

• Bulab 6002 (Fire water additive for bio-fouling control)

• Seawater constituents

• Oil & Grease

• Cathodic protection constituents Maximum Daily Flow 2,534,400 gpd Sample Location: No monitoring required for chemical parameters.

I. : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 006 - (Unit 2 and Unit 3 Inputs to DSN 006)

(see Figures lIB, 12B and 13C)

==

Description:==

Unit No. 2 and Unit No. 3 floor drains, roof drains, surface runoff and yard drains including: Unit 2 and 3 Secondary System Drainage; Unit 2 and Unit 3 turbine building floor drains; Unit 3 control building floor drains; Unit 3 Engineered Safety Feature building roof drains; Unit 2 and 3 emergency diesel jacket cooling water drainage; Unit 2 and Unit 3 secondary system incidental leakage and drainage during plant start up, shut down, operation and maintenance; Unit 2 and Unit 3 secondary system sample waste; Unit 2 and 3 condensate surge tank drainage; hydrolazing and water washes including domestic water, de-ionized water and seawater; clean water drains; service water system drainage; domestic and fire system drainage; continuous reject flow from reverse osmosis treatment of make-up water from the Unit 2 and Unit 3 pure water treatment system (Ionics.Building); above wastewaters generated during start up, shut down, and plant operation, incidental system leakage and maintenance; fire suppression system discharges, including flush phase of fire water system test; air conditioning and compressor condensate drains; Millstone Radwaste Reduction Facility sump; condensate polishing facility spent ion exchange resin dewatering drainage; generator stator cooling drains; Unit 2 and Unit 3 emergency diesel generator room floor drains through oil/water separators; transformer area yard drains through oil/water separators; Unit 2 reactor building footing drain water; and Units 2 and 3 intake structure debris dumpster leakage.

Floor drains in the Unit 2 and 3 Turbine Buildings are treated via an oil/water separator and discharged to the Turbine Bldg. floor drain sump. The Unit 2 floor drains and discharges directed to the Unit 2 Condenser pit sumps are also treated with activated carbon upstream of the oil/water separator.

This discharge may include:

• Unit 3 Engineered Safety Feature building roof drains.

• Control Building Chill Water Drains and Washwater

• Miscellaneous Yard Drain (surface water runoff) Systems

• CPF spent ion exchange resin dewatering drainage

• Condensate Storage Tank Drains

• Condensate Surge Tank Drains for maintenance or in the event of automatic plant shutdown, or other emergency situation

• Water Treating Storage Tank Drains

• Permeate Tank Drains

• MSVB Floor Drains

• Domestic Water Storage Tank

• Underdrain sumps outside the EDG, AUX, and ESF Buildings

• Hydrolazing wastewater and water washes including domestic water, de-ionized water, seawater, clean water drains and service water system drainage

• Incidental non-radioactive wastewaters from numerous intermittent sources from Units 2 and 3

• Secondary system drainage and leakage

• Auxiliary Steam and condensate system drainage and leakage.

• Secondary system corrosion product sampler and in-line ion liquid chromatograph sample streams.

• De-icing pit sump

• Enclosure building sump rainwater

• Clean water washes or drains

I. : Discharge Inforniation Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 006 - (Unit 2 and Unit 3 Inputs to DSN 006)(continued).

• Unit 3 Reactor Enclosure foundation drains (groundwater)

• Unit 2 and 3 turbine building floor drains and sumps.

• Transformer area yard drains through oil/water separators, including fire water deluge testing.

• Diesel jacket cooling water/service water & coolant drains (Units 2 and 3 emergency diesels).

• Switchgear cooler drains

• Service water header drains

• Feed Ring header drain

• Instrumentation water drains and flushes resulting from maintenance activities and instrument calibrations

• Generator stator cooling drains

• Permanent or temporary component/motor cooling water drains

• Domestic water washes, drains and flushes

• Leakage and misc. drains from the Water Treatment Building (Ionics), closed cooling water system leakage, Aux. Steam supplied by U-3 Aux. Boiler system, circulating water and service water, condensate/feedwater drains, lay-up solutions, fire system flush test drains.

• Units 2 and 3 emergency diesel generator room floor drains through oil/water separator, including service water drains, service water heat exchanger draining and hydrolazing using primary makeup water (demineralized water), domestic water or seawater

• Millstone Radwaste Reduction Facility (MRRF) sump.

• Deionized water tank drains

)

Air conditioning and compressor condensate drains.

• Fire equipment drains & flushes

• Units 2 and 3 secondary system sample cooling water

• Units 2 and 3 secondary system sample effluent.

• CPF drainage and area floor drains

• Eye wash stations and emergency showers

• Cathodic and corrosion protection systems in use at the station, including at the intake structures, condenser waterboxes, and oil/water separators

• Discharges from the flush phase of the fire water system test. This includes fire water flushed from major piping loops in the on-site fire water system that has settled in a frac tank and is discharged through filter socks onto a grassed area and enters the last catch basin prior to the discharge of 006 to Niantic Bay.

Discharges directed to the Unit 2 condenser pit sumps are treated with a granular activated carbon (GAC) filter upstream of oil/water separator No. 2 prior to discharge via DSN 006. During changeout of the GAC filter (approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />), these discharges would be handled using one of the following methods:

• A duplicate GAC filter in place; or A temporary GAC filter would be put in place; or

• These discharges would be temporarily retained in portable containers or other Unit 2 sumps until the GAC filter has been replaced and subsequently treated and discharged out 006.

The backwash from the primary GAC filter may be directed to the CPF sumps TK 10/11 (DSN 001B-6).

Alternate paths for this discharge include:

Various sources which reach DSN 006 through the condenser pit sumps may be redirected elsewhere as shown in Figure 12B.

Attfchment 0: Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 006 (Unit 2 and Unit 3 Inputs to DSN 006) (continued).

Potential Chemicals in discharge:

• LCS 1200 (molybdate & tolyltriazole)

• Chlorine (free and total residual)

• Domestic water constituents including chlorine and zinc Oil & grease

• Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B & D) up to 200 ppb from chilled water system leakage

• Freon (R12 difluorodichloromethane) up to 200 ppb from chilled water system leakage

• Hydrazine Carbohydrazide

• Suspended Solids Ethanolamine

• Boric Acid

• Ammonia

• Bulab 6002 (Fire water additive for bio-fouling control)

• Copper

• Lead

• Nickel Portable eye wash station additive 2

• Iron

• Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

Lithium hydroxide (primary to secondary leaks)

• Reagents from in-line instrumentation

• LCS 60

• Surfactants

• Cathodic protection constituents

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 006 (Unit 2 and Unit 3 Inputs to DSN 006) (continued).

Proposed Chemicals for Future Use:

• Acti-Klean (Ethylene Gylcol Monobutyl Ether/Dodecylbenzene Sulfonic Acid)

• Simple Green (2 - Butoxyethanol)

• Calclean (Sodium Metasilicate)

• Service First Pan Treatment (Didecyl Dimethyl Ammonium Chloride/n-Alkyl Dimethyl Benzyl Ammonium/Chloride

• Service First Enviro-Coil (Concentrate/Sodium Metasilicate)

• Dimethylamine

• Diaminoethane

• Diaminopropane

• 2-Amino, 2-Methylpropanol

• 5-Aminopentanol

• Coil-Rite (Butyl Cellosolve EB/Isopropyl Alcohol)

• 3-OH-Quinuclidine

• 3-Methoxypropylamine

• Diethylhydroxylamine

• N-isopropylhydroxylamine

• Pyrrolidine Maximum Flow: 432,000 gallons per day (excluding surface water runoff). This is a variable flow, dependent upon activities that are occurring.

Sample Location: Sampling manhole approximately 245 feet from outlet.

Attichment 0: Discharge Infornmation Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 C - UNIT 3 DISCHARGE (Figure 3C)

This discharge includes:

• Circulating pump lubrication water strainer blowdown.

• Continuous discharge during plant operations.

• Non-contact cooling discharge from Unit No. 3 condensers

• All upstream discharges having the description DSN 00iC-l through OOlC-9 when they discharge.

• Erosion solids of epoxy coating within circulating and service water systems.

• Pump lubrication and leakoff/seal water.

• System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

• Fire suppression system discharges Maintenance activities discharges, including intake desilting

• Cathodic and corrosion protection systems in use at the station, including at the intake structures, condenser waterboxes, and oil/water separators

• Underdrain sumps outside the EDG, AUX, and ESF Buildings

• Unit 3 Reactor Enclosure foundation drains (groundwater)

==

Description:==

Unit 3 discharge, including DSNs OOIC-l through DSN 001C-9: Non-contact cooling water discharge from Unit 3 circulating water pumps/condenser system, intake pump operation discharges (seal, lube and strainer backwash water) returned to intake bays, and miscellaneous cooling water system leakage and drainage of plant systems and components during plant start up, shutdown, plant operation, intake desilting discharge, intake bay maintenance and dewatering activities, incidental system leakage and maintenance.

Six-153,000 gpm motor driven wet pit pumps are located in the Unit No. 3 intake house. These pumps circulate the water through the intake structure, into the main condensers, and discharge into the quarry. This system is equipped with a cathodic protection system and certain components of the circulating and service water systems are epoxy coated. The circulating water is drawn through traveling screens and chlorinated on the suction side of the circulating water pumps. The screens are designed to prevent debris larger than 3/8 inch from passing into the circulating water, condenser and service water pumps. The sodium hypochlorite system is located in the intake structure and functions to chlorinate the circulating water on a shock treatment basis.

The sodium hypochlorite solution is injected between the intake structure trash racks and traveling screens via a diffusion pipe system. The screenwash pumps are secured (off) when shock treating the intake bays to prevent chlorination of discharge DSN 004. Periodically, the hypochlorite injection system is flushed with domestic water to remove crystallized sodium hypochlorite.

Lubricating water (including pump leakoff water) provides lubrication and sealing of the circulating pump shafts. The water supply is salt water from Niantic Bay that flows from the service water pumps and, therefore, contains residual chlorine. When a circulating pump is taken off line, the lubrication water flow can continue for a short time, discharging into the pump's intake bay.

If necessary to prevent icing of the water in and around the intake structure, a portion of the circulating water (approximately 100,000 gpm from downstream of the condensers) is redirected into the intake bay through a pipe located at the intake structure. This procedure occurs very rarely.

I. : Discharge Information Response to Part A, Question 7 - Description of specific process or activity

>generating discharge Millstone Power Station Application Addendum No. S DSN OO1C - UNIT 3 DISCHARGE (continued).

Normal operating procedures include, as needed to maintain efficiency, the elevation of intake water temperature in each intake bay by a thermal backwash process for biofouling control. An ambient temperature back flush with intake water may be also be conducted to maintain efficiency. These condenser backflushes are performed to remove debris from the condenser tubes, waterbox tubesheets, and the inlets of the circulating water system. They last for short periods (5 to 10 minutes) and are normally performed during storm events (or shortly after) or following a thermal backwash, to remove debris from these areas. The backflush is accomplished by recirculating water within one-half of a condenser by closing the condenser discharge valve, causing a flow reversal.

Alternate Paths for this Discharge:

• Supply cooling water to the service water system during maintenance and emergency operations.

Potential Chemicals in discharge:

• Chlorine (free and total residual)

• Domestic water constituents including chlorine and zinc

• All other chemicals which may be present as identified in the process descriptions for DSN OOIC-1 through DSN OOIC-9.

• Bulab 6002 (Fire water additive for bio-fouling control)

)

• Seawater constituents

• Service water piping epoxy coating erosion solids Oil & Grease

• Cathodic protection constituents Maximum daily flow: 1,410,600,000 gallons per day Sample Location: Dip sample from the mouth of discharge tunnel 001-C, which feeds into quarry.

)

Attachment O. Discharge Information Response to Part A, Question 7 - Description of specific process or activity -

N generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIC UNIT 3 STEAM GENERATOR BLOWDOWN DISCHARGE (Figure 5C)

This discharge includes:

Steam generator blowdown Sample reclaim tank drainage System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

==

Description:==

Unit No. 3 Steam generator blowdown and wastewater collected in the steam generator blowdown tank prior to discharge to DSN 00 IC.

Recycled condensate from the condensate polishing facility (CPF) and make-up water (from the Ionics system) are treated in the feedwater system with hydrazine, ethanolamine and possibly ammonium hydroxide to maintain secondary plant chemistry. The steam generators operate with continuous blowdown. In closed cycle blowdown, steam generator blowdown water flows back to the condenser hotwell and then to the CPF where the water is purified. Over time, organic acids (a byproduct of ethanolamine) build up in the steam generators because they are not efficiently removed in the CPF. Periodically, the steam generators are placed

)

in open cycle blowdown and discharged via the steam generator blowdown tank and DSN 001C-I. This discharge also includes steam generator blowdown during startup, hot standby, operation and shutdown. Also, this discharge includes steam generator draining, refilling and draining again during shutdown and refueling to speed cooling. DSN OOIC-I(a) can be redirected to this discharge as an alternative pathway.

When the plant is shut down, the steam generators may be filled with clean water for cooling, and inspected, repaired and/or cleaned (sludge lanced) with high pressure water. To support these operations, the steam generators may be drained via the blowdown discharge path.

In the future, Unit 3 may investigate the use of alternate steam generator treatment methods. These methods will include boric acid, ammonium chloride and alternate amines (listed below).

Alternate Flowpaths for this Discharge:

The steam generators can also be drained to the containment sump and pumped to the high level waste drain tanks (DSN OO1C-2) or low level waste drain tanks (DSN 001C-3).

The steam generator blowdown tank can also be directed to DSN OO1C-8 during startup, shutdown and maintenance.

Potential Chemicals in discharge:

• Boric Acid

• Lithium hydroxide (during primary to secondary leaks)

• Iron, copper, lead, nickel, zinc

• Ethanolamine

• Suspended Solids II

Discharge Information Response to Part A, Question 7 - Description of specific process or activity Agenerating discharge Millstone Power Station Application Addendum No. S DSN O0OIC UNIT 3 STEAM GENERATOR BLOWDOWN DISCHARGE (continued).

• Hydrazine

• Ammonia

• Reagents from in-line instrumentation

• Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

• Carbohydrazide Proposed Chemicals for Future Use:

• Diethyihydroxylamine

• N-isopropylhydroxylamnine

• Dimethylamine

• Diaminopropane

• 2-amino, 2-methylpropanol

• 5-aminopentanol

• 3-OH-Quinuclidine

• 3-methoxypropylamine

• Diaminoethane Pyrrolidine Max Daily flow: 1,400,000 gallons per day Sample Location: Auxiliary building primary sink sample valve tapped from the steam generator blowdown (BD) piping, or secondary sample sink tapped from the BD line in the Unit 3 turbine building, or 13D sample filters inlet drain valve also in the Unit 3 auxiliary building.

II

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C-1 (a) - UNIT 3 STEAM GENERATOR WET LAY-UP DISCHARGE (Figure 5C)

This discharge includes:

Steam generator drainage for maintenance Steam generator drainage for chemical control Steam generator sludge lancing drainage System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sludge lancing, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

==

Description:==

Unit 3 steam generator wet lay up drainage for maintenance, plant start up and shut down, hot standby and shutdown, chemical control and sludge lancing. As an alternate pathway, the Unit 3 steam generator wet lay up drainage may be directed to the Unit 3 condensate demineralizer waste neutralization sumps or the high or low level waste drain tanks in the Unit 3 liquid radioactive waste systems.

During periods of reactor shutdown, the steam generators may be maintained in a wet lay up condition. Wet lay up is a condition where steam generators are completely filled with water and may or may not contain elevated levels of hydrazine and ammonium hydroxide to scavenge oxygen and control pH. Ethanolamine may also rarely be used as a pH additive. The steam generators are continuously recirculated to mix the treatment chemicals.

Additionally, steam generators may be filled with clean water for cooling and subsequently drained.

The steam generators are drained with the steam generator drain pump periodically from a wet lay up condition for maintenance (discussed under DSN 001C-1) or for chemistry control. During power operations, impurities "hideout" in crevices within the steam generators.

As temperature is reduced, these impurities return and must be removed. This return period may last several weeks, so the steam generators may be drained and refilled many times to control the concentration of these impurities.

Alternate Flowpaths for this Discharge:

DSN 001C-6 (TKIO and 11)

DSN 001 C-2 (High level waste drain tank)

DSN OO1C-3 (Low level waste drain tank)

DSN 001C-1 (U3 Steam Generator Blowdown)

DSN 001C-8 (Hotwell discharge)

During primary to secondary leaks, these alternate paths may be used to prevent the discharge of radioactive isotopes to the environment. Additionally, DSN OOIC-6 (IT-10 or TK-11) may be used as an alternate path if the normal wet lay-up flowpath is out of service due to maintenance.

Potential Chemicals in discharge:

Boric Acid Lithium hydroxide (during primary to secondary leaks)

Iron, copper, lead, nickel, zinc Suspended Solids

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 C-1 (a) - UNIT 3 STEAM GENERATOR WET LAY-UP DISCHARGE (Continued).

Oil & Grease Ethanolamine Hydrazine Ammonia Reagent wastes from in-line instrumentation Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

Carbohydrazide Proposed Chemicals for Future Use:

Diethylhydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamine Diarninoethane Pyrrolidine Max daily flow: 288,000 gallons per day Expected frequency: variable Sample Location: Sampling valve on the wet lay up recirculation pump skid discharge piping and drain valve for each steam generator recirculation header in the Unit 3 containment building, or the main steam valve building (MSVB) discharge header.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 C UNIT 3 RADIOACTIVE WASTE TEST TANK DISCHARGE (Figure 6C & 7C)

This discharge includes:

Reactor coolant and supporting systems drainage Leakage from pumps, valves and connections throughout the radiologically controlled area (RCA)

Closed cooling and chilled water system leakage and drainage Various systems drainage for maintenance Groundwater infiltration Plant sampling waste water Laboratory chemical wastewater Fire protection system drainage Domestic water usage for water washes, cooling water and hydrolazing Auxiliary condensate system drainage and leakage Hot water heating system drainage and leakage Leakage, overflow and drainage from the neutron shield tank System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

Reactor coolant system leakage and drainage from maintenance activities including hydrogen peroxide cleaning solution.

Clean water washes or drains.

==

Description:==

Unit No. 3 Radiation Waste Test Tank Discharme.

Waste test tanks (A and B) and boron test tanks (A and B) including waste water from areas within the reactor building and other radiological controlled areas (RCAs) and various sumps located within the Unit 3 turbine building during plant start up shut down operation, incidental system leakage and maintenance. Discharges from DSN 001C-1, OOIC-l(a), 001C-3, 001C-9 and the Unit 3 turbine building sump may be directed to this discharge as an alternate pathway.

The radioactive waste system at Unit 3 consists of high level waste (more'radioactively contaminated) and low level waste (DSN 001C-3). The high level waste system receives waste water from areas within the RCA with the exception of the turbine building sump. These waste waters originate mainly due to plant leakage, sampling and system drainage. Many systems are contained in the RCA, so potentially, any waste water from these systems may flow to the high or low level waste system. The high level waste drain tanks A & B receive waste water from several sumps. These sumps receive waste mainly from floor and equipment drains.

The high level waste drain tanks collect water from the high level waste system and the boron recovery system. Normally, the high level waste drain tank is transferred via a filter and demineralizer to the waste test tanks. The waste test tanks are recirculated and sampled prior to discharge. The waste test tanks may be discharged directly, recirculated through a filter and demineralizer or transferred back to the high level waste drain tank for further processing. It is also possible to transfer water between the high level waste drain tank and the low level waste tank for processing.

7) : Discharge Inforination Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 C UNIT 3 RADIOACTIVE WASTE TEST TANK DISCHARGE (continued).

The boron recovery system receives waste water from the reactor coolant system. This water is processed by evaporation to remove boric acid. The resulting distillate flows to the boron test tanks (BT1') where it is recirculated and sampled prior to discharge. The BTTs may also be further processed by demineralization and

• filtration.

Alternate Paths:

Boron recovery tanks discharge to the high level waste drain tanks High level waste drain tank to low level waste drain tank (DSN OOIC-3)

BTT discharge to the primary grade storage tank or are directed back to the high level waste drain tanks for additional processing.

Also, some inputs may be redirected to the Unit I Evaporator System storage tank that can be an input to DSN 001A-1 orOOlA-2.

Additional Information Due to biological activity in the waste sumps within the high and low level waste system, filters within the system routinely become clogged prematurely.

Biocides, BULAB 8007 and BULAB 6013 (Buckman Laboratories) in combination with hydrogen peroxide have been proposed for use at Unit 3. This will reduce the frequency with which these filters are replaced thus reducing the volume of radioactive waste generated and improving system performance.

Potenti 0

0 al Chemicals in discharge:

Boric Acid Lithium hydroxide Iron, copper, zinc, lead, nickel, chromium Ethanolamine Hydrazine Ammonia Reagent wastes from in-line instrumentation and the chemistry laboratory Carbohydrazide Chlorine (free and total residual)

Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B &

D) up to 200 ppb from chilled water system leakage Hydrogen peroxide Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

LCS 1000/1200 (molybdate & tolyltriazole)

Bulab 6013 (biocide)

Bulab 8007 (biocide)

Bulab 6002 (Fire water additive for bio-fouling control)

Suspended Solids Surfactants Oil & Grease 0

0 0

0 0

a 0

0 0

.1

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 00 IC UNIT 3 RADIOACTIVE WASTE TEST TANK DISCHARGE (continued).

Proposed Chemicals for Future Use:

Diethylhydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamine Diaminoethane Pyrrolidine Max Daily Flow: 50,000 gallons Max Flow per batch: 25,000 gallons Number of Batches: Variable Sample Location:

Boron Test Tanks - Sample valves located in the primary sample sink in the Unit 3 auxiliary building.

)

Tapped from the recirculation pipe for the boron test tanks (A or B) at the discharge of the boron test tank discharge pumps (A or B).

Waste Test Tanks - Sample valves located in the Unit 3 liquid waste building and tapped from the recirculation pipe for the waste test tanks (A or B) at the discharge of the waste test tank discharge pumps (A or B).

Alternate sample location is the recirculation header drain valves (A or B) at the discharge of the pumps in the waste building.

l7 : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIC UNIT 3 LOW LEVEL RADIOACTIVE WASTE DRAIN TANK DISCHARGE (Figure 6C)

This discharge includes:

Unit 3 corrosion product sampler waste stream reactor coolant and supporting systems drainage leakage from pumps, valves and connections throughout the radiologically controlled area (RCA) closed cooling and chilled water system leakage and drainage various system drainage for maintenance groundwater infiltration plant sampling waste (non-routine)

Neutron Shield Tank Drainage chemical laboratory waste fire protection system drainage domestic water usage for water washes, cooling water and hydrolazing auxiliary steam and condensate system drainage and leakage hot water heating system drainage and leakage leakage, overflow and drainage from the neutron shield tank System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

Reactor coolant system leakage and drainage from maintenance activities including hydrogen peroxide cleaning solution.

Health Physics decontamination activities Clean water washes or drains

==

Description:==

Unit 3 Low Level Radiation Waste Drain Tank Discharge. Unit 3 low level waste drain tanks (A and B) including waste water containing low levels of radioactivity from areas within the reactor building and other radiological controlled areas and various sumps located within the Unit 3 turbine building during plant start up and shut down, operation, incidental system leakage and maintenance. Waste waters from the high level waste drain tanks (DSN 00IC-2) and from the Unit 3 turbine building sump may also be directed to this discharge as an alternate pathway. Also DSNs 001C-1, OOIC-l(a) and OOIC-9 may be directed to this discharge as an alternate pathway.

The low level waste system receives waste waters from various floor and equipment drains and system drains throughout the RCA. These sources are discussed under DSN OOIC-2. The water in the low level waste drain tanks is recirculated and sampled prior to discharge through an inline filter. Due to groundwater infiltration, the wastewater in the low level waste drain tank may contain elevated levels of suspended solids.

Alternate paths for this discharge include:

Discharge to the high level waste drain tank (DSN 00IC-2)

Also, some inputs may be redirected to the Unit I Evaporator System storage tank that can be an input to DSN OOIA-1 or OOIA-2.

)

I r

) : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 00IC UNIT 3 LOW LEVEL RADIOACTIVE WASTE DRAIN TANK DISCHARGE (continued).

Potenti 0

S S

S 0

0 S

0 0

0 0

0 al Chemicals in discharge:

Boric Acid Lithium hydroxide Gluteraldehyde (CCW biocide)

Iron, copper, zinc leak, nickel, chromium Ethanolamine Hydrazine Ammonia Any constituents present in 00 IC-1, 001C-I(a) and 00IC-9 Reagent wastes from in-line instrumentation and the chemistry laboratory Carbohydrazide Chlorine (free and total residual)

Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B &

D) up to 200 ppb from chilled water system leakage LCS 60 Bulab 8007 (biocide)

Portable eye wash additive Hydrogen Peroxide Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

LCS 1200 (molybdate & tolyltriazole)

Bulab 6013 (biocide)

Bulab 6002 (Fire water additive for bio-fouling control)

Surfactants Oil & Grease S

S S

S 0

S Proposed Chemicals for Future Use:

Diaminoethane Diethylhydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamine Pyrrolidine Maximum Flow: 20,000 gallons per day.

Maximum flow per batch: 5,000 gallons Number of batches: Variable

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 00IC UNIT 3 LOW LEVEL RADIOACTIVE WASTE DRAIN TANK DISCHARGE (continued).

Sample Location: Low Level Radiation Waste Drain Tanks - Sample valves located in the Unit 3 liquid waste building and tapped from the recirculation pipe for the low level radiation waste drain tanks (A or B) at the discharge of the low level radiation waste drain tank discharge pumps (A or B). Alternate sample location is the recirculation header drain valves (A or B) at the discharge of the pumps in the waste building.

9

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C UNIT 3 MAKE-UP WASTE NEUTRALIZATION SUMP (See Figure 8C)

Included in this discharge:

a Secondary system leakage and drainage Closed cooling water system leakage and drainage (DSN 001C-9 alternate path)

Feedwater system wet lay-up drainage System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing, water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

Incidental leakage from bulk acid and caustic storage systems Condenser cleaning wastewater Alternate pathway for wastewater from DSN 001 C-6 Underdrain sumps outside the EDG, AUX, and ESF Buildings Unit 3 Reactor Enclosure foundation drains (groundwater)

==

Description:==

Secondary System Wet Lay Up Drainage, Secondary System Drainage, Auxiliary Boiler Stack Drainage, auxiliary boiler blowdown sump (ABD TK-2) inputs normally directed to DSN 001C-6(b) and closed cooling water system leakage and drainage normally directed to DSN 001C-9. A proposed future filter system to remove suspended solids is planned on the discharge side of the make-up waste neutralization sump (refer to Figure 8C).

These filters would remove suspended solids from condenser cleaning wastewater and hydrolazing waters, if directed to this discharge.

Potential Chemicals in discharge:

Boric Acid Lithium hydroxide (during primary to secondary leaks)

Iron, copper Ethanolamine Hydrazine Sodium hydroxide Sulfuric acid Ammonia Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B &

D) up to 200 ppb from chilled water system leakage Suspended Solids Oil & Grease Domestic water constituents including chlorine and zinc Surfactants Carbohydrazide LCS 1200 (molybdate & tolyltriazole)

Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

Hydrogen peroxide

• 1 : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 00IC UNIT 3 MAKE-UP WASTE NEUTRALIZATION SUMP (continued)

Proposed Chemicals for Future Use:

Diethylhydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamine Diaminoethane Pyrrolidine Maximum Flow: 80,000 gallons per day Number of batches: Variable Sample Location:

Sample valve tapped from the make up waste neutralization sump pump common discharge/recirculation pipe in the Unit 3 turbine building.

,)

I r : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C UNIT 3 SERVICE WATER, AUXILIARY HEAT EXCHANGER (See Figure 4C)

This discharge includes:

Continuous discharge of non-contact cooling water Continuous discharge of sodium hypochlorite Discharge of suspended solids during heat exchanger hydrolazing Firewater and service water system drains are other sources to this discharge.

Pump lubrication and seal water Washwater during hydrolazing maintenance activities System leakage, drains, building drains, relief valve flows/discharges, maintenance wash water including sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

Underdrain sumps outside the EDG, AUX, and ESF Buildings Unit 3 Reactor Enclosure foundation drains (groundwater)

==

Description:==

Unit 3 service water from auxiliary heat exchangers during start up, shut down, operation, incidental system leakage and maintenance, continuous discharge of non-contact cooling water containing residual chlorine, including pump lubrication water, pump seal water, hydrolazing waste water, incidental leakage from heat exchanger tube leaks and cooling water supplied from the Unit 3 circulating water system during service water pump maintenance.

The Unit 3 service water system provides cooling water to various heat exchangers throughout the plant..The system is divided (procedurally) into two sections (trains). Each train is supplied by two service water pumps at a maximum flow rate of 15,000 gallons per minute for each pump. The service water pumps (four total) are wet pit pumps located in the bays of the intake structure. Sodium hypochlorite solution from the sodium hypochlorite system is injected downstream of the service water strainers.

During certain emergency situations such as equipment failure, sodium hypochlorite may be added into the suction of the running service water pumps. The free available chlorine concentration of the service water system is measured at the discharge of the reactor plant closed cooling water system (RPCCW). Two of the 3 RPCCW heat exchangers are normally in operation. Operating heat exchanger discharges (two normally) are sampled and the results are averaged.

Periodically, the hypochlorite injection system is flushed with domestic water to remove crystallized sodium hypochlorite.

As shown on Figure 4C, the discharge of each service water pump is equipped with a strainer to prevent small debris not removed in the traveling screens from entering the service water system. Periodically, the strainers must be backwashed due to clogging. They may also be backwashed at a set (timed) frequency.

The discharge of the strainer backwash is via two 3" pipes from the intake structure to Niantic Bay. Each service water train is equipped with a backwash discharge. The discharges are-located on the north and south faces of the intake structure (DSNs 004a and 004b).

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C UNIT 3 SERVICE WATER. AUXILIARY HEAT EXCHANGER (Continued).

The service water system is a safety related system, so at least one service water train must be in operation at all times. During certain maintenance activities, the service water system may be supplied by a circulating water pump. Portions of the system may be taken out of service periodically and drained for maintenance.

Additionally, the heat exchangers cooled by the service water system must be periodically cleaned (hydrolazed) to remove biogrowth and debris. The source of water used for hydrolazing may be domestic water or demineralized water.

Small amounts of closed cooling water may be discharged via DSN 00IC-5 for short periods as a result of heat exchanger tube leaks.

Potential Chemicals in discharge:

Chlorine (free and total residual)

Domestic water constituents including chlorine and zinc system chemicals from heat exchanger leakage including Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B & D)

Maximum Flow: 86,400,000 gallons per day Sample Location: Sampling valves at the service water discharge of the A, B & C reactor plant closed cooling water heat exchangers. Operating heat exchangers are sampled and results averaged for the total discharge.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity

.generating discharge Millstone Power Station Application Addendum No. S DSN OOIC-6 UNIT 3

CONDENSATE POLISHER REGENERATION WASTEWATER NEUTRALIZATION TANK DISCHARGE (Figure I 0)

Discharge includes:

• CPF floor drains, vents, incidental system leakage, maintenance activity wastewaters, and relief valve discharges.

• CPF regeneration wastewater which may contain hydrazine, ethanolamine, ammonia, neutralized sulfuric acid and sodium hydroxide, and other amines and reducing agents in the future as described below.

• Regeneration system tank drains, vents, overflow.

• Plant equipment wash water (domestic water).

• Domestic wash water, eye wash and emergency shower waste and cooling water.

• CPF area floor drains.

• CPF waste water from resin cleaning, backwashing, soaking and rinsing.

• Steam generator drainage from wet lay-up (DSN OOIC-l(a) alternate pathway).

• Auxiliary boiler system drainage via 3ABDTK-1 or 3ABDTK-2 or 3ABDTK-2 high level overflow (3CNDTK-10 only).

• Hot water heating system drainage.

• Steam generator sludge lancing waste water.

• Feed and condensate system drainage (secondary system).

• Air conditioner and air compressor condensate drains.

CPF sample wastewater.

• In line instrumentation wastewater.

CPF discharge pump shaft seal water.

• System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

• Unit 2 CPF wastewaters from DSN 001B-6 (as an alternate pathway).

• Four (4) waste evaporator feed tanks (14,000-gallons each).

• Clean water washes or drains.

• Resin dewatering water.

==

Description:==

Unit 3 condensate polishing facility discharge: Unit 3 condensate polishing facility operation including system area floor drains, vents, incidental leakage, maintenance activity wastewater, resin regeneration and drain wastewater, condensate polisher system wastewater, fire water, waste evaporator feed tank water, service water (seawater), steam generator wet lay up drainage (DSN OOIC-1(a) alternate path), ABD TK-1 or ABD TK-2 discharge during maintenance activities (DSN 001C-6(b) alternate path), hot water heating system drainage, service water system leakage, secondary system drainage and air conditioner and air compressor condensate drains during plant start up, plant operation, shut down, incidental system leakage and maintenance. Unit 2 CPF wastewaters (including auxiliary boiler blowdown) normally directed to DSN 001B-6 may be directed to this discharge as an alternate pathway. This discharge is essentially a batch discharge; however, some of the minor inputs are continuous. Continuous inputs include domestic water inputs from pump and fan seal water and sample sink drains. These inputs constitute minimum flow (less than 1% per N

hour of tank volume, i.e., less than 250 gallons).

l z : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C UNIT 3 CONDENSATE POLISHER REGENERATION WASTEWATER NEUTRALIZATION TANK DISCHARGE (continued).

During normal at-power operations, the entire condensate flow is directed to the condensate polishing facility (CPF). The CPF removes impurities from the condenser tube leakage, primary to secondary leakage, and the corrosion of system piping and components. The CPF consists of eight demineralization beds. During plant operations seven of the beds are in service while the eighth bed is being rinsed and regenerated. Each bed consists of 200 cubic feet of resin.

The influent water contains ethanolamine, ammonia, hydrazine and corrosion products. The beds are operated until the resin effluent shows an increase in specific conductivity.

The exhausted resin is then transferred to the regeneration room where it is rinsed and regenerated, using sulfuric acid (cation) and sodium hydroxide (anion).

Regeneration waste waters (including transfer, cleaning, regeneration, rinse and soak) are neutralized in TKI0 and TK1I sumps with sulfuric acid and/or caustic prior to discharge. Unit 3 received authorization from CTDEP in late 2000 to provide treatment for hydrazine reduction similar to that treatment provided in Unit 2 for DSN 001B-6. In order to provide for operational flexibility, transfer, backwash and rinse water would normally be transferred to TK-10 while regeneration waste waters would be transferred to TK-11 prior to discharge.

Alternate Discharge Paths:

Wastewater from DSN 001C-6 can be redirected to DSN 001C-4 as an alternate pathway.

Potential Chemicals in discharge:

Domestic water constituents including chlorine and zinc Iron, copper, cadmium, chromium, lead, nickel, zinc Ammonia Boric Acid Lithium hydroxide (during primary to secondary leaks)

Ethanolamine Hydrazine Conquor 3585 (methoxypropylamihe & diethylhydroxylamine)

LCS 1200 (molybdate & tolyltriazole)

Reagent wastes from in-line instrumentation Sodium hydroxide and sulfuric acid Hydrogen peroxide (from hydrazine treatment and odor control)

Carbohydrazide Bulab 6002 (Fire water additive for bio-fouling control)

Oil & Grease Suspended Solids Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a-430-3, Appendix B &

D) up to 200 ppb from closed cooling system leakage Surfactants from equipment washes Seawater constituents

r : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001 C UNIT 3 CONDENSATE POLISHER REGENERATION WASTEWATER NEUTRALIZATION TANK DISCHARGE (continued).

Proposed Chemicals for Future Use:

Diethylhydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamune Pyrrolidine Diaminoethane Maximum Flow: 75,000 gallons per day Number of Batches: Variable Sample Location: Sample valve on the common discharge line from TK-10 & TK-1 I CPF sample sink on the filter outlet in the Unit 3 turbine building.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 C-6(a) - UNIT 3 STEAM GENERATOR CHEMICAL DECONTAMINATION WASTEWATER This is an infrequent batch discharge.

==

Description:==

Unit No. 3 Steam Generator Chemical Decontamination Wastewater.

Steam Generator chemical decontamination is performed on the secondary side steam generator to maintain steam generator internals.

Prior to performing chemical cleaning or decontamination of the steam generators Millstone would submit for the review and approval of the Commissioner an engineering report on the proposed process, chemicals potentially present, discharge volumes and schedule of implementation.

Alternate paths for this discharge include:

None Potential Chemicals in discharge:

Information to be included in report described above.

Maximum Daily Flow: Information to be included in report described above.

Sample Location: Immediately following treatment.

)1

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C-6(b) - UNIT 3 AUXILIARY BOILER BLOWDOWN SUMP DISCHARGE (See Figure 9C)

This discharge includes:

Continuous discharge of auxiliary boiler components during boiler operation Hot water heating system drainage Auxiliary boiler blowdown Auxiliary boiler enclosure oil/water separator System leakage, maintenance washwater, and relief valve discharges System leakage, drains, building drains, relief valve flows, maintenance activities including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

Auxiliary steam system leakage, condensate, and drainage.

In-line hydrazine analyzer flows

==

Description:==

Intermittent discharge of the Unit 3 auxiliary boiler blowdown including continuous discharge of auxiliary boiler components during auxiliary boiler operation, hot water heating system drainage, intermittent discharge of the auxiliary boiler enclosure oil and water separator and drainage of secondary system wastewater during plant start up, shutdown, plant operation, incidental system leakage and maintenance.

During normal plant operations, auxiliary steam is supplied to various plant loads (i.e. hot water heating system) by the main steam system. When Unit 3 is shut down, these loads are supplied by the auxiliary boilers. Hydrazine is added using a continuous injection system to the auxiliary boilers to scavenge oxygen and control pH. As boiler chemistry dictates, the auxiliary boilers may be placed in blowdown to remove impurities.

There is also a continuous in-line hydrazine analyzer.

Analyzer flows are directed to this discharge.

The auxiliary boiler blowdown' sump (TK-2) receives wastewater from the auxiliary boiler blowdown tank (ABD TK-I). The auxiliary boiler blowdown tank receives flow from the auxiliary boiler blowdown, auxiliary boiler system components, auxiliary steam condensate, and the auxiliary boiler enclosure oil and water separator. The flow of waste water to TK-2 is continuous during plant operation. Unit 3 is proposing that TK-1 and/or TK-2 be lined up to drain to the CPF sump (TK-10, DSN 001C-6) when necessary for system maintenance.

Alternate Pathways: This discharge may be directed to DSN 001C-4 as an alternate pathway.

Potential Chemicals in discharge:

hydrazine carbohydrazide oil and grease iron, copper, lead, cadmium, nickel, chromium chlorine (free and total residual) domestic water constituents including chlorine and zinc ammonia suspended solids radioactivity

I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. S DSN 001C-6(b) - UNIT 3 AUXILIARY BOILER BLOWDOWN SUMP DISCHARGE (continued).

surfactants reagent wastes from in-line instrumentation lithium hydroxide (during primary to secondary leaks) ethanolamine Conquor 3585 (methoxypropylamine & diethylhydroxylamine) boric acid Bulab 6002 (Fire water additive for bio-fouling control)

Proposed Chemicals for Future Use:

diethylhydroxylamine n-isopropylhydroxylamine dimethylamine diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamine Diaminoethane Pyrrolidine Maximum Flow: 72,000 gallons per day Sample Location: Sample valve tapped from the outlet pipe downstream of 3ABD-TK2 pump discharge in the east CPF enclosure in the Unit 3 turbine building.

I

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIC UNIT 3 HOTWELL DISCHARGE (Figure I C)

This Discharge Includes:

Feedwater heater lay-up drains performed during maintenance Condensate and feedwater system leakage and drainage.

Extraction steam High temperature feedwater heater shell drainage.

==

Description:==

Unit 3 wastewater discharged directly from the condensate pump discharge including secondary system wastewater drainage for maintenance, secondary system drainage to control secondary plant water inventory (condensate surge tank level) and steam generator blowdown tank when on open cycle blowdown (normally directed to DSN OOIC-1) during plant start up and shut down, secondary system wet lay up wastewater and hotwell wet lay up drainage during start up, shut down, operation, incidental system leakage and maintenance (normally directed to OO1C-1(a)).

During Unit 3 outages, the condenser hotwells (3) are full of water immediately following plant shutdown. As maintenance activities require, the hotwells are sampled and discharged from a wet lay up condition.

Additionally, many secondary systems are drained back to the hotwells (by normal plant lineup) to allow for maintenance on these systems.

The condenser hotwells may be discharged via DSN OO1C-8. The discharge side of the condensate pump is the normal sample location. An alternate sample location is the secondary sample sink where this discharge can be directed from a pump in the hotwell. A point is reached when the condenser pump loses suction (cavitates). At this point, a skid-mounted pump located on the west side of the hotwell takes a suction off the hotwell and the remainder of the hotwell is discharged via DSN OOIC-9.

In the event of an automatic plant shutdown, a plant startup, or an emergency situation, the hotwell may be discharged on a continuous basis versus a batch. This discharge is used to control secondary system inventory (condensate surge tank level) only during these plant operations.

Alternate Discharge Paths:

Hotwell discharge via DSN OOIC-9.

Potential Chemicals in discharge:

Hydrazine Ethanolamine Ammonia Copper, iron Boric Acid Lithium hydroxide (during primary to secondary leaks)

Reagent wastes from in-line instrumentation Domestic water constituents including chlorine and zinc Freon up to 200 ppb (CCS relief/leaks)

Oil & Grease

r I : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN OOIC UNIT 3 HOTWELL DISCHARGE (continued)

Surfactants Suspended Solids Carbohydrazide Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

Proposed Chemicals for Future Use:

Diethyihydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aniinopentanol 3-OH-Quinuclidine 3-methoxypropylamine Pyrrolidine Diaminoethane Maximum Flow per batch: 100,000 gallons Maximum Flow (continuous discharge): 250,000 gallons per day Sample Location: Condensate pump discharge sample valve in secondary sample sink in the Unit 3 turbine building or individual hotwell sample valves in secondary sample sink.

F

T I

) : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001 C UNIT 3 CLOSED COOLING WATER SYSTEM DRAINAGE (See Figure 12C)

This discharge includes:

turbine plant and reactor plant closed cooling water leakage and drainage reactor plant and control building chilled water system leakage and drainage service water system leakage and drainage condenser hotwell Incidental system leakage, drains, building drains, relief valve flows, maintenance activities, including hydrolazing water washes, sump discharges, and incidental system leakage during startup, shutdown, operation, and maintenance.

==

Description:==

Unit No. 3 Closed Cooling Water System Drainage: Turbine building and reactor building closed cooling water drainage, reactor plant and control building chilled water system drainage, service water system drainage, and condenser hotwell drainage (alternate flow path for 001C-8).

DSN 001C-9 is a pipe connection located on the discharge of the "F" circulating water pipe in the Unit 3 east condenser pit. This discharge path is used on an as needed basis to drain closed cooling water and various plant systems for maintenance. The drainage is collected in portable containers in the Unit 3 turbine Building.

The water collected in these containers is discharged with a portable pump, the discharge of which is connected to DSN OOIC-9.

Alternate Pathway Closed cooling water system drainage and leakage can be directed to DSNs 001C-2, 001C-3 or 001C-4 as an alternate path.

Potenti; 0

al Chemicals in discharge:

Boric Acid Lithium hydroxide (during primary system leaks)

Ethanolamine Hydrazine Ammonia Reagent wastes from in-line instrumentation Freon (R22, chlorodifluoromethane or other future refrigerants not listed in 22a430-3, Appendix B &

D) up to 200 ppb from chilled water system leakage Freon (R12 difluorodichloromethane) up to 200 ppb from chilled water system leakage Domestic water constituents including chlorine and zinc Carbohydrazide LCS 1200 (molybdate & tolyltriazole)

Conquor 3585 (methoxypropylamine & diethylhydroxylamine)

LCS 60 (Control Building Chill Water)

Service water constituents (seawater constituents, TRC)

Oil & Grease Surfactants 0

0 0

0 0

0 0

0

I~

. : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 001C UNIT 3 CLOSED COOLING WATER SYSTEM DRAINAGE (continued).

Proposed Chemicals for Future Use:

Diethylhydroxylamine N-isopropylhydroxylamine Dimethylamine Diaminopropane 2-amino, 2-methylpropanol 5-aminopentanol 3-OH-Quinuclidine 3-methoxypropylamine Diaminoethane Pyrrolidine Maximum Flow: 30,000 gallons per day Sample Location: Sample from portable tank put in service when closed cooling water system drainage is required, or the sampling valve located in the secondary sample sink in the Unit 3 turbine building for a batch discharge from the condenser hotwell

..)

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 004 - UNIT NO. 3 SCREEN WASHWATER DISCHARGE (see Figure 2C)

This discharge may include:

Unit 3 Traveling screen wash water (seawater) which re-directs some of the materials collected (e.g.,

debris and fish) on the traveling screens to Niantic Bay through the trash basket.

The service water pump discharge headers are equipped with strainers, and the strainers are automatically or manually backwashed (for approximately 12 minutes).

• Firewater used in an emergency to clean the traveling screens

• Domestic water used as bearing lube water and seal water for screenwash pumps

• Domestic rinse and wash water

• System leakage, drains, incidental system leakage, and maintenance activities during startup, operation, and shutdown.

• Hydrolazing wastewaters

• Backside refuse trough

• Debris conveyor

• Intake desilting wastewater

• Nozzle strainer blowdown

• Cathodic and corrosion protection systems in use at the station, including at the intake structures, condenser waterboxes, and oil/water separators

)

==

Description:==

Unit No. 3 Screen Washwater Discharges, including the debris conveyor and backside refuse trough located on the southeast corner side of the unit intake structure, and the Unit 3 fish return trough on the northwest corner of the Unit 3 intake structure, domestic water from washdowns and hydrolazing activities, service water pump strainer backwashes, incidental system leakage, and fire suppression system discharges. Strainer screens are located on the intake and the backwash of these strainers is directed to this discharge.

The inlet of the Unit 3 intake structure is equipped with traveling screens to prevent debris from being drawn into the service and circulating water systems. Wash water, which is supplied by one of two screenwash pumps, is directed through a strainer and then sprayed through nozzles onto the screens to remove debris including fish, crustaceans and algae. The screens and spray are designed in such a way that the debris and fish are separated. The debris is discharged into a trough on the southeast side of the intake structure. The fish are discharged through a trough on the northwest side of the intake structure. The screenwash strainer(s) blowdown is directed back to its respective source bay.

As shown on Figure 4C, the discharge of each service water pump is equipped with a strainer to prevent small debris not removed in the traveling screens from entering the service water system. Periodically, the strainers must be backwashed due to clogging. They may also be backwashed at a set (timed) frequency. The discharge of the strainer backwash is via two 3" pipes from the intake structure to Niantic Bay. Each service water train is equipped with a backwash discharge. The discharges are located on the northwest and southeast faces of the intake structure.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 004 - UNIT NO. 3 SCREEN WASHWATER DISCHARGE (continued)

During normal maintenance of the intake, washdown and power washing activities occur in the area adjacent to the intake structure. This wash water drains through DSN 004. In addition, the intake bays are occasionally desilted. The debris which collects in the intake bay (mussels, dirt, etc.) is pumped out to a strainer basket in an above ground container located next to the intake structure. The water which passes through the strainer basket is discharged through DSN 004. The material collected in the basket is taken off-site.

There are five (5) pathways for this discharge including:

• 004a (east side of intake structure)

• 004b (west side of intake structure)

• 004c (debris conveyor)

• 004d (backside refuse trough)

• 004e (fish trough)

• nozzle strainer blowdown Potential Chemicals in discharge:

Seawater constituents Domestic water constituents including chlorine and zinc Bulab 6002 (Fire water additive for bio-fouling control)

Cathodic protection constituents Maximum Flow: 11,520,000 gallons per day Sample Location: No monitoring required.

Discharge Information Response to Part A, Question 7 - Description of specific process or activity

?

generating discharge Millstone Power Station Application Addendum No. 5 DSN FW - FIRE WATER SYSTEM DISCHARGES Fire suppression system discharges, clean water washes or drains, air conditioner condensate drains, maintenance/cleaning of heat exchanger coils and radiators, and condensate drip pans to stormwater DSNs:

005, 007, 008, 009, 011, 012, 014, 015, 016, 019, 021, 022, 024, 024A, 027, 028, 032, OO1B-12 (see separate Form 0 for 001B-12), and flow phase of fire water system test to Niantic Bay.

The flow phase of the fire water system test to Niantic Bay is the discharge of fire water from major piping loops in the on-site fire water system over the rock outcrop between the Units I and 2 Intake Structures and directly to Niantic Bay to assure flow rates meet technical specifications.

II

,-f _

. : Discharge Information Response to Part A, Question 7 - Description of specific process or activity generating discharge Millstone Power Station Application Addendum No. 5 DSN 017 - MARINE BIOLOGY LABORATORY SEAWATER RETURN Seawater is pumped into the marine biology laboratory from either a seawater well installed at/near mean high water on the western shore of Jordan Cove or via one of two 3-inch seawater lines which extend out to the lab dock and also withdraw unfiltered water from Jordan Cove through a coarse mesh intake box. Naturally filtered seawater is normally drawn from the seawater well except during times when freshwater intrusion from rain events occurs. During these times, seawater that is withdrawn from the two 3-inch lines, is mixed with the well seawater or used exclusively. The seawater that is withdrawn is circulated through the various tanks containing aquatic organisms in the lab and used in the laboratory's bioassay program. No chemicals are added to the water in the lab. The drains from all of the laboratory seawater holding tanks are connected to a single return line that discharges back to the seawater well. The well seawater, which is located in the beach, is naturally filtered through the sand. The dock intake, which has two 3-inch lines is equipped with an engineered filtration system with a fiberglass/polyester vessel filled with a quartz multi-mixture media that filters the seawater down to 2 microns. This filtration system is designed to automatically backwash every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. These backwashes, containing seaweed and particles from the dock intake system, are discharged into the quarry via one of two existing 2-inch discharge lines. Periodically, the backwash is chlorinated to combat biofouling of the filter media. Excess seawater that is withdrawn from the two 3-inch lines and not used in the lab tanks passes through the laboratory and discharges into the quarry via the same 2-inch discharge lines.

Maximum Daily Flow: Variable Sample Location: No monitoring required.

I I

I FF4J FIOURE 48 ALTERNATE PATHWAY N01t: 1, WS VOAMwUU81AWS ICI)WCO NO

.iRATfAV*CNAAOE*YOUftCO10lY. REFER TO roups m TDmuam i4 FostoTPEH ouJncu L WOM L DF0 F0C0 IATff=*%46f

• OCOLM OUPIASEMfIAMM JIMfTOOKrW.

, DOAR A"ATIj*HRt i0 FOCCW SUMP ANDOUTD000116gU, IKfE FflUR9 128.

MILLSTONE POWER STATION MAIM PIRMINCic MWATERFORD.

CONNECMCUTF ljljic VUNIT NO. 2 REACTOR BUILDING CLOSED COOLING WATER SYSTEM (DSN 0011B-9)

AddeNo.5

MCESS OFF GAS PIPEWAY SUMP NPUTS INPUJTS

• Off-gas lb* codhiIs droln ktor Groudwater

-Rain Water flg

• poUArySlwLeakage

]PIPEW ALTERNATE PAThFWAY I

TOOOIB9 SEE F1G. 33 i

IF RADIOLOGICALLY CONTAMINATED TO aIR. WATER TUNNEL IF NON-RADIOLOGICALLY CONTAPANATED MILLSTONE POWER STATiON

%D WATERFORD, CONEwCCUT IG RLNI UNIT NO. 2 AUXILIARY BUILDING SUMPS Addendum No.5S

STATE OFCONNECTICUT DEPARTMENT OF ENVIRbNMENTAL PRCJTECTION I CERTIFY THAT THIS POC 5'

pDES PEMIT TRUE COPY OF THE ORIGINAL.

lortheast Ntucleir-Inergy Company P.0. 1ox 270 C

Nartford, CT 06141-02701REC E& D-DC1192 0e:

Facility 'ML RLAL

-'Tovn of-.'J aLt OFVATEP R.GC.

Long hul t Iatershed' Attention:

'Mr.

'.A.

Recke'rt, Vice President-This permit is issued in accordance 'ith Section 22a-430 of Chapter 446k, Connecticut General Statutes, and regulations, adopted thereunder, as amended, ursuant 'toain approval dated September 26, 1973, by sbe Admitistrator of the

United;Steis Environen'til'rotection Agency for the State of Connecticut to administer a.P.D.E.S. permit program.

Your application'for "permit reissuance -submitted'by )Northeast Utilities Service Company on December 1, 1989, bhs been, revieved:by the Connecticut Department of Environmental Protection.,

,the' discharge,'is subject to the effluent guidelines and-standards for the steameilectric ppver. generating point source category promulgated on November 19, 1982 pursuant to Section 301 'of the Federal Clean Vater Act, s amended Specifically, this discharge is subject to 40 CFRY Parts 12S and' 423 of the

-effluent guidelines and standards.

,The Commissioner of Environmental Protection (hereinafter the Commissioner') has determined that th'e effluent limitations which'would require the 'use of cooling' ystems-at the Millstone Hucleir'Pover Station, Units' 1. 2 and 3 other than the existing once-through systemc utilited by the:applicant for the control of the thermal component -of the'aplicant's discharge-are more stringent' than necessary to assure the protection' indpropigation of a balanced indigenous population'of shellfish, fish and wildlife in and'on the receiving vaters. 'Zn the.4iev ofthis'findini,sbthe -Comzissioner has herein established alternative and less" stringent' effluentt limitationsitn accordance with Section 316(a) of the Clean Vater Act.,

..'Bovever,: the Commissioner bao also deterlined that additional evidence

• basod upon actual operating - experiene of Millstone )uclea'sr Poer. Station, Units 1, 2 and'3

'ould be de&sibeIn'-order tocorroborate,,the Commissioner's.

tfindinit.

-The' Co=missioner espressly reservei - the. -rlght to, impose more stringent effluent 'limitations with' respect".t t he thermal Component of the

,Company's discharge pursuant to' Se'ction 22*-430 of Chapte'r46k', Connecticut Ceneral Statutes should further investigation 'f ihe effect of "'the Company'*

discharge fail' to corroborate the Cottissioner' a determintilon that tore stringent effluent limitations are not necessary" to assure'theprotection and propagation of a balanced indigenous population of the shellfish. fish and wildlife in and on the receiving waters. Such data will be generated by ^e studies to be conducted pursuant to paragraph 5. of this permit.

Qruad o bydW pap)

)

°n Cq~i Avw

/iod T60

9 The Com=issioner has determined that the location, design, construction and capacity of the cooling Vater' intake structure represents the best available technology for minimizing adverse environmental impact from impingement and entrainment pursuant to Section 316(b) of the Federal Act.

The Commissioner has also determined that additional evidence based upon actual operating experience of Millstone Nuclear Pover Station,.. Units 1.,.. 2 and 3 vould'be desirable in order to corroborate the Commissioner's findings. Such data will be generated by the studies to be conducted pursuant to paragraphs 5. and S. of this permit.

The Pernittee should take cognizance of the fact that additional evidence may result in the imposition, of more stringent-requirements and the potential utilization of a cooling system other than the one utilized. Accordingly, the company should' take this potential into, consideration in their design wherever feasible.

Your discharge toxicity evaluation MDTE),' submitted by Northeast Utilities:

Environmental Laboratory on December 28, ~1988,. has been revieved by-',the.

Connecticut Department. of Environmental Protection, has been found' to -be.

consistent vith Section 22a-430-4(c)(2i) of 'the Regulations of Connecticut State'Agencies and is hereby approved in'. accordanceviith Section 22a-430 of Chapter 446k, Connecticut General Statutes.

The Commissionershas found that the discharges Vill not cause pollution2 of the waters of the state vbeinall the conditions of, this permit have been met.

This action is further found to be consistent with the. applicable policies of

,the Connecticut Coastal Management Act (Section 22a-92 oftthe. Connecticut General' Statutes).

The Commissioner has determined that Northeast'Nuclear Energy Company is in

'full compliance with Order ID.' VC4107 entered on, October-18'. 1985.

The Commissioner,, acting under Section> 22a-430, hereby permits 'Northeast Nuclear Energy Company to. discharge wastewaters' in accordance with the following

'conditionss

2.

The vastevaters shailbe collected, treated and/or discharged in accordance with the above referenced application and.:all ap1provals issued by the Commissioner or his authorized agent' for the' discharges-and/or activities au-thorized by or associated with this permit.

2.

Monitoring and reporting of radloactive -liquid releases are perforied in accordance' ith' 10 l CFR 20. Standards" for Protection Against Radiation.

BSannuil monitoring reports a*stu6miitted to the:Federill Nuclear Regulatory Commission and the Connecticut Depatment.of' Environmentai Protection, Bureau of Air Management, Radiation Control Division.

Monitoring and reportini'i'ncludes

(,

4

.3 I

a)

Gross radioactivity (less tritium, gases and alpha)

.)-

total' release (curies)

2) average conceitration released 'uCi/zl)

'b). -Tritium.

^

1). ~total telease '(curies) 2 2).

average concentration released e

uCi/m1) 1 c); Dsolved gae

1) totil -release (curies)

.-.2) average concentration reeiised (UCi/nil)

'd) Gross alph-a*

1) total-release (curies) i

2) average concentration releised tuCi/ml)

-te)

Volume of liquid waste discharged (liters)

)-' Volume of dillution vater (liters)

).) Isotopesiceleasied(curies):.

-h) - Percen'tof 2.0-CFR20,' Appezdix ZTible U1-for total4release

1) Percent 'of technical specifica tion 1iiit-f differeit' fom 10 CFR 20, for the 'total;release if such specifications are establlihed by V.L.C.

3.

The discharges 'shaill'not,exceed and, shall othervise conform to specific terms and condiions licted:.belov.

Tue discharges shall beMonitored and results.reported to'the Vater Management Duretu(Attn:

DHR Processing) by the end of' the onth-after the month in which samples are taken according to the foll'ov4lj schedule:

, -A.;.

Discharge Serial N4o. 001-1

.Sohii's ig'Lcation: 2.-.

Descriplo'nV Discharge Po~its ~at Quarry. Cut (Eastj, Vest)

(Discharge Code 102000a)

Receiving Streamts!Long-Island Sound (Basin Code 2000)3' Presmnt/Fiituire Vater QuaiityStindarda SA/SA g inib Dily Flow: 2,738000D'000 gallons ;perday ;

(1) b v ~of-the dischrge' "shall not be les thara 6.0 or greater than 9.0 (Code 00400-012).

(2) The discharge shall not contain or cause in the receiving waters

'a visible oSl.lsheen or floatitnge:olids.

n (3), -The dischiarge-shall 2ot cause visible discolbiitionor'foaigb the receivini waters..-.

4.

4.

L.

The maximum temperature of the discharge :hshall be"'OS° 05 and-the maximum temptrature Increase at the Quarry Cut 'btove'the intake water temperature Shall be' 320F.

F.

(S) The differential temperature increase at the Quarry'Cdt~ibove the intake water temperature under unusual conditions may be increased to 44 F for a period not exceeding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

in the event the temperature differential exceeds 32 0 ?, the Department of Environmental Protection shall be immediately notified and a written report of the incident filed.

If.1

I AL (6) The pernittee shall operate all facilitles An such a manner as not to Orase the average temierature: of the receiving waters more than 4 F or inmrease the normal temperature of the receiving vaters above 83. F.o For purposes of, this condition, cognizance vll be given to reasonable time and. distaice to alloy mixing of effluent and receiving waters, but the boundary of the mixing zone shall not exceed a radius of 8000 feet from the discharge outlet at the quarry cut.

(7) The thermal plume alloyed within the permissible mixing zone as defined by these conditions shall, not block' zones of fish passage.

(8)

The discharge and operation of all facilities shall not alter significantly the color, turbidity -,tstea odor or levels of colifoIa bicteria from ambient'levels in-the receiving vaters; no-shall the level of dissolved oxygen in tbhe. receiving waters fall belov 5.0 ng/l as a result of such discharge.

() Th~etotil'residual chlorine concentration in tbe discharge at the

,,Quarry Cutvshall not exceed 0o.1mg/l at any tim.e (10) Free available chlorine shall not be discharged in the condenser cooling vater of any one unit for more, than two hours in any one day.

(ll)'Free available chlorine shall not be discharged in the condenser cooling vater of more than one'unit at any one time.

(12) The discharge. shall contain no other -chemical constituents in concentrations and combinations vhich are harmful to human.

animal 'or aquatic life, or which make thevaters unsafe or unsuitable for fish or shellfish or their piopagation, impair the palatability of same, or iipair the waters for others uses.

1...

(

maximum Instant.

t IAM4 t a

.MinuM frequency o ftfRlTh"14,nY Sample 9wV%

X w S i pH 4UMperature Free Available Chiorine Total Rssidual Chlorine

.*. -I., _:.:

00400.012 00011.015

50064.019.

50.0 _

50060.019 See (1) A Ste (4) A 1bove 'Hourly Cc) 6bove-Hourly, Veckly Ve.

.kly.

Instantaneous Instantaneous Crab Crab 041 mg/i t..

L

(z)

.Report the follo ing data: :

i

2) tiily range 'of DV

3)

Daily aximum temperature F)

4)

Daily minimum temperature

5)

Daily average temperiature i

6)

Monthly standard deviation of temperature

-7)

Daily sai temperature increase

• il inmiit rperature increase

9)

DAilyW aveage temperature increase D

10)

Monthly standard deviation of temperaturirincrease-

11)

Monthly aximum heat'loadCtU/hr.)

~

12)E Monthly tizlii6 heat load

13)

Monthly average it

load,

14)

Monthly maxii-U rate' of change of heat load'

15)

Monthly standard deviation of beat load Cb)

The permittee shall record the -instantaneous flov (Code:

00058.078) at the-time of grab sample collection.'"'

(c) The permittee shall monitor pH manually every -foiur' 'hours whenever the automated pE monitoring equipment malfun'cti6ns.

(d) The report shall include a detailed explanation-of 'Kany violations of the limitations specified above.

B. Discharge Serial No. 001-A Monitoring Locations:

I

==

Description:==

Unit No. 1 Discharge` (Discharge Code 102D0Da)

Maximum Daily Floas '6D0;00D gallons per day Maximum Temperatures' 7 F'

Average Desigp ;ezperature lincrease: ;22.Z.F (1) The maximum teperatue' icrease,at the No.t 0b 2 discharge bove~ sbe. inta

' vatermemper ture shall be 320F.

eptr,'

b3 (2)

The 'd fformntiil temperatirencrease at the -Vnit No. I discharge above the iixtAke water temiprature may be,icreased to 44 F for p period uottxeeding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> under -conditions of reduced cooling waler fly.

In!' he*' event -the temperature differential iexceeds 327.1, ethe

D artntt of Ivirmoniental Protection shall

'ibevotified in' he 3tiiy'monitoring report.

(3)

The normal operating frociduresi Include, usiually not more than 12

-.--rti-es a us the, elevation of the Intake water temperature an eahcondieiiir' by a" hermal acah 4cor of ' 'sea mthevsb t

process required for the control of'0'ez~'

i t't'sue-tem'peraturn'ie ifference between

-:--t e-receiing. stream and discharge water shall be' allowed to J'

exceed.theiirmit limit for'brief periods during this treatment schedule.

t

-.6 (4) Free available chlorine shall not be discharged in the cooling water for more than two hours in any one available chlorine shall not be discharged in the cooling vater of more than one unit ataiiy one time.

condenser day. Free condenser (5) The pH of the discharge shall not be less than 6.0 or greater than 9.0 (Code 00400-012).

.Maxim~um in.

tant'.

tlmitt Minimum I riquency Af CAiTO4v"a Sample swI.'

Parameter -

-Code :;

,v.

aS vv s

-1. -

Aquatic Toxicity, C0019-09A Acute Aquatic Toxicity. C0020-09A Chronic Flow 74076-007 pH.

0-00400-012 Temperature F 00011-015 See paragrail 3.B. (6) beli See, paragrapl

3.

(6) bgli h!

OV Quarterly

.:.Z.,;

hr Quarterlys Dv Hourly Hourly (b)

Hourly Daily Composite Daily Composite Instantaneous Instantaneous Instantaneous Free Available Chlorine Free Aviilable Chlorine 50064-019 50064-001 0.25 mg/l Veekly,(c)

Grab Crab 573.04 kg/d Veekly (b)

I-(

(a) Report the following datas f..

14

.4

.4

1)

Daily range of pH

2) Daily-range of flow.

3) Daily, mazimumt.perature C O)

4) Daily inimum temperature

5) Diily. average temperature

6) Monthly standard deviation of temperature

7) Daily maximum temperature increase B):

Daily minimum temperature increase,

9) Daily average te peratureicrease LO)

Monthly standard deviation of temperature increase LI)`

Monthly maximum heat load (ZTU/br.)

L2)

Monthly uinimui hiat loid !

L3)

Monthly average hent` iioAd i4) Monthly mazizum rateof chiige of heat load 5)~ Monthly standard deviitlon of heatload

16)

Total flov during chloiition pesiod each sampling day L7)

Total daily flow (b)

The permittee

'ail monitor pEA manually every four hours whenever the automated pB monltoring equlpment malfunctions.

(c) Whenever: Unit No. I Is operating,' weekly monitoring of free available chlorlne shall be~ierforued when chlorination of condenser cooling water occurs.

(

.7

' d) The report shall include a! detailed explanation of any violations of the liiitations esecitfied above.

(6j' Effective 'upon ssuance.'and there'after a daily composite sample of the-'effluent-shli-not -iiibit acute 'or chronic toxicity in the receiving waterbody.

(a)Compliance Vitbh this permit condition shall be achieved whent

.. f... 4 the Daily Flov of the discharge is greater than or equal :to -43,200,000' gallons and there Is no significint mortaltyi' n a daily composite sample of the effluen^'at

"'a concentration equal to or greater than an NOAEL.- lD002' as deterzined by the pass/fail methodoloty in' 'Section -22a-430-3(i)(7)(A) of the

/

l

Regulations of Connecticut State Agenci (ii) the, Daily Flovwof the discharge

• 3,200 iDDDD gallons ' and there ;is mortality in a daly'composite sample at a concentiationequail'to or greater

' -'42 as, determined by the pass/fail Section ;22 D40-3(j)(7)(A)

-of the

''4 Cainnectieut State 'ArencEvS. -

es; or

'is less than no significant of the effluent than an NROAEL -

methodology in Regulations of I

Zi b) 'Monitorizg to determine compliance.vith.this limit shall be

'prformed ;Quarterly.

&JDnuiry

' -April,

July, October)

'follovizg-the toaicity testing 'protocol for static acute

'toxicity.5-tests in, methodsfor )'easuring the Acute Toxicity

-of-Effluents tor Preshvatr andt Iarine Organisms (EPA

' '6D0/4.5/013) yith the ollovink specificationsI (1) Xyidpsis babla 'IS idays old or less) and Qnrinodon

"^z;;

zir xs (30, */-

5 days old) shall be used as test organisM1

' ii) Synthetic o'r matural ieavater adjusted to a salinity of 28-32 ppti shll be' dused as dilution water in the

^z

-tests.

-ill) Test duration sball be 1S hours for tlysidopeis babia fi96 zour&-for-gy:6iiiton l~tregatbs..

c)' -Any, test In which' t6esuriival of test organisms is less than zinety (90) Peicnet.n each re'i cate control test

-chamber or failure -to chiee test Conditions 'as specified In Section 22a-I4iD-15)(7)(A) of the, Regulations' of

.'Connecticut State;"Agen'ies.

such as maintenanzce of

appropriste environment&l' controls; shall constitute an invalid test and 'will require immediate :ete'ting' Failure to submit valid test' results constitutesa" 'permit' violation.

Gr.

-~

a *

(d) Results of the toxicity tests required as part of this permit condition shall be entered on the Discharge Monitoring Report (DHR) for the month in which it was performed, using the appropriate parameter code.

Additionally, complete and accurate test data, including all supporting chemical/physical measurements performed in association with the toxicity

tests, as vell as dose/response data shall be entered on the Aquatic Toxicity Monitoring Report form (ATHR).

The ATHR shall be sent to the folloving addresst Aquatic Toxicity Connecticut Department of Environmental Protection

'Water Compliance Unit 122 Vashington Street Hartford, CT 06106 le)

If any test result indicates that the maximum daily toxicity.

limit for the effluent has been exceeded, a second sample of the effluent shall be collected, and tested as described above mnd the results reported to the Commissioner within 30 days of the recuipt of the first set of test results.

tf)

If any two consecutive test results or any three test results in a single year indicate that the maximum daily toxicity imit has been. exceeded, the permittee shall

...immediately take all reasonable steps to eliminate toxicity vherever possible and shall submit a report for the reviev and approval of the Commissioner in accordance vith Section 22a-430-3(j)Cl0)(e) of the Regulations of Connecticut State Agencies describing proposed steps to eliminate the toxic impact of-the discharge on the-ieceiving waterbody.

Such a report shall include a proposed time schedule to accomplish toxicity reduction.

(7) The discharge shall contain no net.increase in any of the metal parameters listed belov, except -as alloyed in accordance with this permit.

Sampling shall be conducted concurrently at both the intake and effluent at the frequency stated.

Minimum Frequency Sample Parameter Code of Samplin, Time Total Copper 01042-028 Quarterly Daily Composite Total Lead 01051-028 Quarterly Daily Composite Total Nickel 01067-028 Quarterly Daily Composite Total iini 01092-028 Quarterly Daily Composite Ammonia -

00610-028 Quarterly Daily Composite Total Suspended Solids 00530-028 Quarterly Daily Composite Surfactanti-Anionic 38260-028 Quarterly Daily Composite Oil & Creasc-T 70030-028 Quarterly Grab

C

.9

. C.

Discharge Serial No. OOIA-1 Monitor'ing Location:e 1.

==

Description:==

Unit No. 1 Radiation Vaite"Sa&ling lank Discharl (Discharge Code 1170000)

Maximum Flow per Batch: 30,000 gallons,.

Maxium Frequency of Discharge:

Onie'per' day Expected irequency's"tOne.per.day

,.requency.'

Parameter Code

'of Sa'T:ee

?

Specific' 00095-011

e-ekly,.

Crab Conductivity PE 004 D-0l2 Weekly Crab

e

.I

..~

I

• (a.)

The permittee,.shall record the total flow (Code 74076-007).

and the number of b6urs'-of discharge (Code.81381-079)..for etib day of,aaple collection.

(b) The report shall include a detailed ' eplunation of,:&xiy violations of the limitations specified above.

L Cc)

Radisation t monitoring Is performed in accordance vith Paragraph:2. above..-

D...

Discharge Serial No. OD1A-2 Monitbriing Locations -l..1...

==

Description:==

' 'Da-NS+/-

1 Floor Drain'Radiation Sacple Tank (Discharge Code 15300DN)

Mazi6un'oFilov'per Ztcb:,.,-14,s000 gallons.,

Maximum Frequency of Discharges Tvo-per diay' E£pected Frequency: One per day.

4*1.1 tl)

The maximumconcentration.,specified -be'ow shall-zot be exceeded at any tine.

• aximum

-Hainum

f!

u, QuantityC ConcentratIon" Frequency Sample Zarareter codie,,'~_

f Per.steb Per bateh of Sarpliny

,vRe Total Suspended ODS30-019 1.9.kg 45.0 zg/l Veekiy Crab t

,Solids "B

, 00400-012b 012 4

t Veekly Crab (a) *Th petrittee shall record the total flow (Code7i7076-007) and the,umber. of hours of disciharge (Code 81381-079),., for a-ta Aa.

(b) The report shall include a detailed explanation of any violations ofthe rlimitations specified above.

A

10 (c)

Radiation monitoring is performed in accordance vith Paragraph 2 above.

E.

Discharge Serial No. DDlA-2(a)

Monitoring Locationt 1

==

Description:==

Long Term Freon Distillation Unit Discharge (Discharge Code 1150080)

MaximumnFlov per Batch:, 220 gallons Maximum Frequency of Discharge:

One per day Expected Frequency: Five per year (1) The maximum concentrations specified belov shall not be exceeded at any time.

Maximum Minimum Concentration Frequency Sample Parameter Code Per Batch of SaMDling Tvre Freon 70015-019 2.0 mg/I Daily (c)

Grab Oil & Grease, 70030-019 20.0 mg/i Daily Cc)

Grab Total (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Codi 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling daily required'only when discharge occurs.

F.

Dlicharge Serial No. OOlA-2(b)

Monitoring-Location:. 1

==

Description:==

Freon Distillation Unit Discharge (Discharge Code 1150080)

Maximum Flov per Batch:, 6,500 gallons Maximum Frequency of Discharge:

One time only (1)

The maximum concentrations' specified belov shall not be exceeded at anytime.

Maxiium Minimum Concentration Frequency Sample Parayeter Code Per Batch of SImpling Tvne Freon 70015-014 2.0 mg/l Daily Cc)

Grab Sample Averagi Oil & Crease.

70030-019 20.0'ag/l Daily (c) Grab Sample Averag Total (a)

The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

t 21

.1 (b) The report shall,-:include a detailed eaplanation violations of the limitation; sp-ecifisd-above. -

(c) Sam-iiing daily required only when disclirge occurs.

of any

.... A I C. Discharge Serial No. 601A-3

==

Description:==

Outside Tank Area Rainvater Collection Discharge (Disc arg*,Code 1O80OON).

Floay Int rmittent.

1) Rad~ia'on zmonitoring is performed.in accordance-vith Parsgraph 2 above.

H. Discharge Serial No. 001A-4 Monitoring Location: 1

==

Description:==

Unit No. 1 tadiation -Decontazination Solution Tank Discharge

.c.(Discharge Code 1060000)

Maximum Flov per Eatchs'.'3,S00 gallons.

Maximum Frequency of Discharge:

Tvo per day Expected Frequency: One per day (1) The maximur concentration' specified belov :shall not be exceeded at' iny'Stbei.

• .1 P~atzmeter ;'

Boric Acid Boric Acid I

Maximum M..timum Quantlty'.

.Concernration Frequency

• ~~~~~~~

Coe-a e<Bth-PrBtc an Srln Sample I'TVD&

I I,

. ~

.~

0069t-019 00698.0S6 -. 6 kg:

5S74. mgfl.> 7Veekly (c)

4.

JYeekly~ Cc)

Grab Grab

_., I

~.4 4

r,..>,

• () The permittee shall record the total flov (Code'74076.007) and the nuiber of'-hours of discharge (Code U 381-079) for

.each-day of "imple collectiO.

i.

s

.4 I'4 4'

A

.4 Cb)

The ieport haill include -a violations of the limitations

.detailed explanation of specified above.

any (c)

SamplLig ieekly for boric acid, is,equired only when boric

• . - icid'ls being used.

Cd)

Radiation monitoring-isAa psrforued

'i-accordace with

^

..Paragraph I above.

3.. Discharge Serial No. O01&-S Monitoring Locationi 1 Descriptions Vnit No. I Auxiliary Beat Exchanger (Service Water)

Discharge (Discharge Code 102000d)

Maximum Daily Floas 43,200,000 gallons per day (1) The temperature of the discharge shall not exceed 900?.

.12 maximum Minimum Instant.

Frequency Sample Parameter Code L{mits of Samnling Tvoe Temperature F 00011-015 See Note (1) above Veckly Instantaneous Free Available 50064-019 0.25 mg/l Veckly Grab Chlorine (a)

The pirmittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall Include a detailed explanation of any violations of the limitations specified above.

J. Discharge Serial No. 001-3 Monitoring Location: 1

==

Description:==

Unit No. 2 Discharge (Discharge Code^102000d)

Maximum Daily Flovs 820, 00,000 gallons per day Maximum Temperature: 105 F Average Design Temperature Increase: 24 F (1) The miximum temperature increase at. the Unit No. 2 discharge above the intake water temperature shall be 32 F.

(2)

The. differential temperature increase at the Unit No. 2 discharge above the intake water temperature may be increased to 44 F for a period not exceeding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, under conditions of reduced cooling vater flov. In the event 'the-temperature differential exceeds 32 F, the Department of Environmental Protection shall be notified in the monthly monitoring report.

(3)

The normal operating procedures include, usually not more than 12 times a year, the elevation of the intake water temperature on each condenser by &'thermal backvash~irocess required for the control of sea mussels. The true tsemperature difference between the receiving stream and discharge water shall be allowed to exceed'the permit limit for brief periods during this treatment schedule.

(4)

Free available chlorine shall not be, discharged in the condenser cooling, water for more than two hours in any one day.

Free available chlorine shall not be discharged in the condenser cooling water of more than one unit at any one time.

(5) The pH of the discharge shall not bi less than 6.0 or greater than 9.0 (Code 00400-012).

(

13

)...I aximum

.. Daily,

?tnff4tc

.Minimum

.Frequency laIar t Pr Simple TOrp Code '

Aquatic Toxicity, C0019-09A S Acute Aquatic:0oxicity. COOZ0-09A S Chronic Plow 74076-007 D040D-012 Temperat'usce".t '

OOO'll-0l5 Free..'Available 50064-019'-

7 Chlorine Fie -Available 50D64.DD1 Chlorine e

. J...

l ee paragraph 3.J.(6) belov ice plragrspb,;.J.(S) below..

!..I Quarterly Quarterly 0.25mg/i 737.154g/d Hourly Hourly (b)

Hourly Veekly (c)

Daily Composite Daily Composite Instantaneous Instantaneous Instantaneous Grab Crab Veekly Cc)

"(a)

Report the folloving data:

.) >Daily'range of p

2)

Dly..rsznge of.flov'

3)

Daily taximum temperature F)

.) Daily minimum temperature

5)

Daily average temperature

.6) outhly standard deviation-of temperature

'7) Dailymaximuma temperature increase.

8)

Daily minimum temperature.increse

9)

Daily average temperature increase 10)-

Monthly standard deviation of temperature Increase

-11) Monthly maximum heat load

.(TU/hr.)

12)

Monthly minizut'heat load".

.13)

Monthly average heat loid 14)- Monthly maximum rate of change of beat load

'15)

-Monthly-standard deviation of beat load 16).

Total flov durtig chlorination period each sampling day

'.<. '^ 17) ' otal daily fl0v.

.(b)

'The. pertittee.. shall monitor pE manually every four hours whenever':the automated pH monitorsin equipment malfunctions.

.1 I.C(c)

'Vhenever Unit :io. 2.s opera'tng.weekly monitoring of free available chlorine shall.be performed'then chlorination of condenser cooling.water occurs.

(d) The report shall Include a detailed. explanation of any violations of the limitatlons specified above.

(6)

Effective upon issuance and thereafter a daily composite sample of the effluent shall mot exhibit acute or chronic toxicity in the receiving waterbody.

(a) Compliance with this perit condition shall be achieved w

Nhen:

Ci) the Daily Flov of the discharge is greater than or equal to 28,800,000 gallons and there is no significant mortality in a daily composite sample of the effluent at a concentration equal to or greater than an NOAEL -

1002 as determined by the pass/fail methodology in Section 22a-430-3Cj)(7)(A) of the Regulations of Connecticut State Agencies: or (ii) the Daily Flov of the discharge Is less than 28,800,000 gallons and the LC value of a daily composite sample of the effluent-'Ps equal to or greater than an LC > 852.

In determining LC value, five (5) test concentrations, in duplicAl, shall be utilized and the LC value shall be determined by the computational nethoi° (Binomial Distribution, Probit Analysis, Moving Average Angle, Speirzan-Karber) which yields the smallest 952 confidence. interval and LC, value which is consistent vith the dose-response data.

(b) Monitoring to determine compliance vith this limit shall be performed Quarterly (January,

April, July, October) following the toxicity testing protocol for static acute toxicity tests in 'Methods for Measuring the Acute Toxicity of Effluents to Freshvater and Marine Organisms' (EPA 600/4-85/013) vith the following specifications (i) Mjsid~oplj babie (5 days old.-or less) and CXvrinodon zariegastu (30 +/- 5 days old) shall be used as test organisms (ii) Synthetic or natural seawater adjusted to a salinity of 28-32 ppt shall be used as dilution water in the tests.

(iii) Test duration shall be 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> for ysldopsis, bahia AID 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> for -;prinodon Xarie.rtu..

(c) Any test in which the survival of test organisms is less than ninety (90) percent in each replicate control test chamber or failure to achieve test conditions as specified in Section 22a-430-3(j)(7)(A) of the Regulations of Connecticut State

Agencies, such as maintenance of appropriate envizonnental controls, shall constitute an invalid test and vill require immediate retesting.

Failure to submit valid test results constitutes a permit violation.

0

25 (d) Results of the toxicity tests required as part of this permit condition shall be' entered on the. Discharge Monitoring Report. MDR) for the month in ihich'.it vas performed, using 'tbhe appr6opriate pariaeter. ;r code.

Additionally. complete and accurate test data, including all supporting chemical/physical mesureents performed in association with the toxicity atest:

as Vell as "d6fs/response data shall be entered on the Aquatic Toxicity Monitoring Report form (ATHR).

The ATUR-shballbe sent to

--the 'folloving address.

Aquatic Toxicity Connecticut Department of 'Environmenta1lProtection 2!Water Compliance Unit

-'; 1 higton Street iartford, :CT 06106 (e)' 5finy est result indicates that the maximum"daily toxicity

'liit for thezeffluentihas been e*see'ded,- a second sample of the effluent shall be collected and tested as described above and the results reported to the Commissioner vIthin 30 days of the receipt of 'thefirst' set'of. test results.;

(f) -'If any tvo. consecutive-test results 'or any three'etest results 'in. va-sngle year indicate'thatf the maix m duily' toxicity limit has been exceededCX 4the pernittieeX sha1l

'Y

,i ediately take all reasonable steps to eliminate'toxicity iherever possible, and shall submit a report for the reviev nd apoproval 'of the Comaissioner in,-accordance with Section 22a-430-3(j):LO)(c) of the 3igiilations-of Connecticut State Agencies describing proposed' steps.to,eliminate the toxic

-- ;. <impact of the discharge on thie'"icetiving vaterbody.

Such a report shall include aproposed time schedule to accomplish toxicity -reduction....,

(7) 'She discharge shall contain to net increase in any of parameters listed :belov, except as allowed in accordance perlt

Sampling shall 'be cc ducted concurrently at both and effluent at the freq'u"ncystated.'

a "'

ju the metal with this the intake Paafirst"Stv --.

.1

-.


, " 1, "

e8d 0.

Total Copper Total Letad Total.Nitkel Total Zinc Ammoniaz i

N' Total Suspended Solids Surfactants Anionic Oil & Crease-Total 0101.2-I 010674I

.-,006l0.!~f

'0053 0.11 18260-1 76030-9

• . requency of SamilInv D2g A-Quarterly 28 Quarterly.

)28 Qi rttrly D.Quarterly

)2S 6

'Quarterly 02B e.Quarterly D2B '; " '.' Quarterly

.2'r bampJle Daily Daily Daily Daily Daily Daily Daily Grab composite Composite Composite Composite Composite Composite Composite

,P S.

216 R. Discharge Serial No. 001B-1 Monitoring Location: 1

==

Description:==

Unit No. 2 Blovdovn Tank and Blowdovn Quench Tank Discharge (Including Boric Acid From Steam Generator Treatment)(Discharge Code 101060z)

Maximum Daily Flows 1.440,000 gallons per day (1) The temperature of the discharge shall not exceed 2200F.

(2)

Prior to the use of diaminoethane the permittee must submit for the review and approval of the Commissioner an engineering report on process modifications.

Maximum Daily Mazxium Instant.

t aa4 a

Minimum Frequency

^* C...l n Sample lr -.

9..^. fl-r a

uLcL cL

%.'*Jr v u ULILLLV

.LW AL v A

• flJC 0

Temperature F Total Suspended Solids Total Suspended Solids Boric Acid Ethanolamine Diaminosthmne 00011-015 00530-019 00530-056 46.8 kg/d See (1) Above 30.0 mg/l Veekly Veekly 00698-056 C0196-019 C019S-019 117. kg/d Veekly Veekly 10.0 mg/i Veekly See Note (b) Below Instantaneous Grab Grab Grab Grab (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sauple collection and/or the instantaneous flow (Code 00058-078) at the time of grab sample collection.

(b) Monitoring for diaminoethane shall be performed as approved by the Commissioner in accordance with Paragraph X.(2) above.

Cc) The report shall include a detailed explanation of any violations of the limitations specified above.

(d) Sampling for boric acid required only when boric acid treatment of steam generator occurs.

(e)

Radiation monitoring Paragraph 2 above.

Is performed in accordance vith L. Discharge Serial No. 0013-1(a)

Monitoring Location:

1

==

Description:==

Unit No. 2 Steam Generator Secondary Side Vet Layup Drainage Discharge (Discharge Code 117000a)

Maximum Flow per Batcht 70,000 gallons Maximum Frequency of Discharge:

Tvo per day Expected rrequencys Six per year I

A..

(1) The temperature of the discharge shall not exceed 25D F.

(2)

A minimum ;of two (2). conden er circulating pumps-shall be in service oniUndt 2 during dis, re (3)

No tvo (2) steam generators may 'discharge" "secondary side wet layup drainage at any one time.

(4) Prior'to the use of diazinoetbane the permittee must submit for 0thereviev;and approval of;the Commiissioner an engineering report on process modifications.

~.

(5) The maximum concentrations specified belay shall' aot at anyjtime.

M

. I.*

.;".1 I -

be exceeded 1. I maximum Quantity Code

^.Per Btath Maximum

. Minimum Concentration Frequency Per Zateh of SaMDlin Sample SviDe T~emperature 0F 1lydrazite iHydrazine Ethanolazine Diazinoethane 1-05S

.5ee

-(i) Above Daily 81313-019 1252 mgl Daily

-81313-ODl 33.12 kg/d Daily C0196-019 ee

i 5.0cg/l

"'i;-

Daly C0l95-019 See 'Note' (b) Selov.

(Cc)

(c) cc)

(c) lnstantaneous Grab Grab Grab (a) The permittee shall record thezInstantaneous flov 00058-078) at the time of grab sample collection.

(Code Monitoring for diazinoethane 'shall betperformed as approved "by the-Commissioner t'in; accordance vith Paragraph L.(4) above.

(c) Daily sampling requ red.otly when-discharging steam generator secondary side wet layup drainage.-.,

td) The report shall icude'--A' deUtailed explanation of any violations of the limitations specified above.

'(e) ladiation. monitoring Is tprformed Sn. accordance with Paragraph 2 above.

-. M.-

Discharge Seral No. '002-2 Monitoring Location:- 1 --

t ntr

==

Description:==

Unit No. '2 ieri4-Vite Radiation Monitor Tank Discharge (Discharge Code, 17000a)

Maximum flow per latchs 5,000 gallons Maximum Frequency of Discharges Three-per day Expected Frequencys Tvo per day (1) The maximum concentration specified beloy shall aot be exceeded at any time.

18

• (2) A minimum of two (2) condenser circulating pumps shall be in service on Unit 2 during discharge except during Unit 2 shutdowns. During Unit -2 shutdowns, the maximum discharge flow shall be 30.5 gallons per minute and a minimum flow equivalent to (2) tvo service water pumps shall be in service on Unit 2 during discharge.

m~aximum Q antity bow tStkrhu maximum Concentration o.w Ut%*P1 minimum Trequency

. Mt e :s"90 4"n Sample Tv*n V-a a.

tnA&

Total Suspended Solids Boric Acid pH 00530.019 45.0 mg/l Veekly Grab 00698-056 200. kg 00400-012 Veckly Veekly Grab Grab (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 31381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of [the limitations specified above.

(c) Radiation monitoring Paragraph 2 above.

is performed in accordance with

(

N.

Discharge Serial No. 0013-2(a)

Monitoring Locations I1

==

Description:==

Unit No.

2 Steam Generator Chemical Vastevaters Discharge (Discharge Code 101070a)

Maximum Flow per Batch:

107,000 gallons Maximum Frequency of Discharge: One per day Expected Frequencyt One per year Cleaning (1) The maximum concentrations specified below shall not be exceeded at any tie.

(2)

A minimum of tYo (2) condenser circulating punps shall be in service on Unit 2 during discharge.

(3) Sixty days Prior to performing chemical cleaning generator the perzittee must submit for the review of the Commissioner an engineering report modifications.

of the steam and approval on process

(

r.

C I.,.

Parameter Mmaximum Daily Minimum Concentration. Frequency.

T-

- '-'-Per-tateh of Satinzln Sample

.Tyne I

Biochemical 00310-019 Oxygen Demand..

Chemicil'Oxygen.. o107_019'

-Deand

!Amonia,N 00'610-019 Coppe'r-?otal 01042-019

,lron-Total 01045-019

`'kryiiiu-Total 01012-019 Cadmium-Total 01027.019 Chrbmjui ITotal 01034-019

9. Lco'e!i Itot.1 01051-,0'9

.,Nicktl-5otal 010674-19

'^2inc-50tal 01092-019

'OD40-012

..Daily,.

Daily i.0 1.0 0.1 1.0 0.1 1.0 1.0 mg/l mg/l mg/i mg/l mg/i mg/i zg/i

Daily, Daily Daily Daily Dal~y..

Daily Daily

.,;ourly Daily Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Da1iy Composite Daily Composite Daily Composite Dily Composite Daily Composite Ringe During Compoititetr Daily!Composite Crab Totl Suspend.

nSolids e-

^, Oil and Crease Id D0530-019 70030-019 10.0 mg/i (a) ^The-permittee shall record the total. flov (Code 74076-007) bnde the

'mber' of hours of discharge (Code 81 B1-079) -for each day of tumple collection.

M --,The

-sh ll Lnrtu reporta e

detailed ;explanation of -ny violationt-of the limittsions specified above.

e1 (c) Sampling required; only-when steam, generator chemical cleaning discharge occurs*

0. Discharge Serial No. 001D-2(b)

Monitoring Location I,1 Descriptions Unit No;'2'Steam Generator, Chemical Decontamination Vito'vater'Diicharge (Discharge Code l01O60y)

Maximum Flow per ZStciI 30,000D.gallons

- -- MXaxzum~r1equnncy.of Discharges One per day Expected :requency3 Oneptr ear 2

(1) 2he.p.of the discharge shall tot be less than 6.0 or greater than 9.0 (Codei `040O-012).

(2)-'me maximum concentrations specified below shall not be exceeded at any timie (3) A tinimum of two (2) condenser circulating pumps shall be in service on Unit 2 during discharge. '

-_ ~

-I 20 (4)

Sixty days prior to performing chemical decontamination of the steam generator the perzittee must submit for the reviev and approval of the Commissioner an engineering report on process modifications.

Maximum Daily Concentration Per Batch Minimum Frequency of Satnlin2 Sample Tyne Parameter Code Biochemical 00310-019 Oxygen Demand5.

Chemical Oxygen U1017-019 Demand Daily Citric Acid Oxalic Acid I

Nitric Acid Permanganate Ithylenediamine Tetraacetic Acid Hydrogen Peroxide Formic Acid Copper-Total Iron-Total Cadmium-Total Chromiuz-Total Lead-Total Nickel-Total Zinc-Total Total Suspended Solids 77666-019 77081-019 C0091-019 C0109-019 78151-019 Daily Daily Daily Daily Daily Daily 00139-019 77006-019 01042-019 01045-019 01027-019 01034-019 01051-019 01067-019 01092-019 00330-019 00400-019 1.0 mg/l 1.0 mg/l 0.2 mg/1 1.0 mg/i 0.1 mg/1 1.0 ng/i 1.0 mg/i 30.0 zg/1 See (1) Above 30.0 mg/i Daily Daily Daily Daily Daily Daily Daily Daily Daily Daily Hourly

'Daily Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite(

Daily Composite Daily Composite Daily Composite Daily Composite Range During Composite Grab Ps Oil0 nd Grease-T 70030-019 (a)

The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling required only when discharging steam generator chemical decontamination wastevater.

(d) Sampling required only for parameters included in the process approved by the Commissioner In accordance vith Paragraph 0.(4) above.

e A....

• 21 P.

Discharge Serial No. 61DB-3 Monitoring Location: 2 Descriptiont Unit, No. 2 Coolant Waste adiation monitor Tank Disichirge (Di-schirki Code i170000)

Maximum Flov per 3atch:' 0O'00' gallons musacu Frequency of Discharges Ivo per day Expected Frequency: One per day U() The xmazium concentration specified belay shall

`ot be exceeded at.'any time..

(2) A minimum of tvo (t2 coidenser circulating pumps shall be in service on Unit 2

duiin

. 'discharge, except r..during Unit 2 shutdowns. During Unit? 2 shutdovns,: tbe maxium d seharge flov shall be 30.5 gallons 'per minute and a mi~uZ flov eqivalent to (2).tvo service.vater pumps shall be in servicemon Unit*2 during discharge.

maxsium Ka uz -.

inimum Quantity Concentration Frequency Sample Parameter Code Per Emt'ch ' Per %atch of Sappliny Tvre w.,-;

,-

• I Tootal Suspended :s00530-019

.22.5 mg/'

Weekly Grab

-Solids Boric Acid 00698-001 70D kg/d weekly Crab

'S

-.7

.(a)-The perm'lttee shall recordtthe-total flov (Code 74076-OD7) andth numbsr of hours'cof discharge. (Code 81381-079) for a,,acb day of.sazple collection.

(b). The, report shall include a detailed explanatioi' of rany

• violations of the limitations specified above.

(c):,, Radiation monitoring is -performed i4n aicicozdancet with Paragraph 2. above.

I Q.

Discharge Serial No. 0O01-S Mn0itoring.Locftions :, I Descriptions, LtUnit No.-'2 Auxiliary Rest.xzcbnger (Service Water Dischargo) (Discharge Code 202000d) maximum Daily flow:s "28,00,000 gallons,.

(1)

The

'emp'raturecfete discharge shall tot exced 95 Ir.

nastant.:

Fequency Simple P'4b Limits

_ofsammlins Type-

'Temperature F Free Available Chlorine 1

-II:

'Weekly

.Veekly instantaneous Grab

t 22 (a) The permittee shall record the instantaneous 00058-078) at the time of grab sample collection.

flow (Code (b) The report shall include a detailed explanation of any violations of the limitations specified above.

R. Discharge Serial No. 001B-6 Monitoring Location: I

==

Description:==

Unit No. 2 Condensate Polisher Regeneration Vastevater Neutralization Tank Discharge Including System Floor Drains, Plant Equipment Vashvater, and Boric Acid from Steam Generator Treatment (Discharge Code 1060000)

Maximum Flov per Batch:

25,000 gallons Maximum Frequency of Discharges Three per day Expected Frequency: Two per day (1) Prior to the use of diaminoethane the permittee must submit for the reviev and approval of the Co=missioner an engineering report on process modifications.

(2) A minimum of two (2) condenser circulating pumps shall be in service on Unit 2 during discharge.

(3) The maximum concentrations specified below shall not be exceeded at any time.

(

Maximum Quantity Per Rateh maximum Concentration Per latrch Minimum Frequency nf Rammi4-no Sample

,T,"

Par U

ter Total, Suspended Solids pH Oil and Grease-T Boric Acid Ethanolamine Diazinoethane 00530-019 43.0 mg/1 Veekly Grab 00400-012 70030-019 00698-056 32.0 kg C0196-056 230 kg C0195-056 Veekly 20.0 mg/i Monthly Veekly lc)

Veekly SCe (d) Below Grab Grab Grab Grab (a)

The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling weekly for boric acid required only when boric acid treatment of steam generator occurs.

(d) Monitoring for diatinoethane shall be performed as approved by the Commissioner in accordance with Paragraph R.(l).

above.

-23 (e) Radiation monitoring 3is performed in accordance vith Paragraph 2:;above.

S.. Discharge Serial.No. 0013-7

.onitorinj Locations 1 2

==

Description:==

s'l--ilt No. 2 Condensate Polisber Auxiliary Heat E£changer

(- ServiceVater)Discharge (Discharge Code 2102000c)

Mximum Daily Flow: 5,760.0DD gallons per day (1) The temperature of the discharge shall not exceed 085F.

I I,.

I"'-

ax

-i mtum Instant.

t 4"4+e minimuz

• 'Frequency Nef Cal"'r14vto

-. SAMPle

-Tvt,'e" tO"MsVtrV.

I Free Available Chlorine 50064-019' '.-

0.25 augt3

~,-

Veekly.

Grab Temperature-O O0011-015 See (1) Above Veekly

.- Xn$stantar (a)

The permittee shall record the instantaneous flow (Code

.OD05B78) at the. tize of grab sample collection.

b). The report shall include a detailed explanation of any violaiions of the limitations specified above.

T.

Discharge Serial No. 0013-B Monitoring Location:

1 Descriptions Unit No. 2 Condenser Notwell Discharge (Discharge Code 117000it Maximum flov per'3stch: -00,00.gallonc Maximium Frequencyr'f Discharge... On* per day

£xpected Frequency: Fiveper jear `

Cl)

The temperature-of theL-discharge shall not exceed 112 F.

(2)

A inimum -of two: (2) condenser circulating pumps shall be in service on Unit 2 during discharge-.-

(3).. Prior to the-use of diaminoethane the peruittee must submit for the treiev and.-and approval of 'tbe Cozzisioner an -engineering

eport;-on processaaodnf~cations.

(4)

T5e mtsaximu oncenzrationspecified below shalln ot be exceeded at any time.

r I',

-4 Meous

24 Kazimum Concentration var Rat-h Minimum Frequency

^f rSef"V 4n" Sample TrW1%

-ba -

t.,*

CndA Temperature F '

pH Total Suspended Solids Total Iron Hydrazine Ethanolamine Diamenoethane 00011-015 00400-012 00530-019 01045-019 81313-019 C0196-019 C0195- 019 SEE NOTE (1) ABOVE 45.0 mg/l 5.0 mg/l 50.0 mg/l 3.0 ag/1 See Note (d)

Daily (c)

Daily (c)

Daily (c)

Daily cc)

Daily (c)

Daily cc)

Below Grab Instantaneous Grab Grab Grab Grab (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 8l381-079) for each day of sazple collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

tc)

Sampling required only when the condenser hotwell discharge occurs.

(d) Monitoring for diaminoethane shall be performed as approved by the Commissioner in accordance vith Paragraph T.(3).

above.

U.

Discharge Serial No. 001B-9 Monitoring Location:

I

==

Description:==

Unit No. 2 Non-contaminated Closed Cooling Vater System Drainage Discharge (Discharge Code 102000b)

Maximum Daily Flowv 30,000 gallons per day (1)

The temperature of the discharge shall not exceed 100°F.

(2)

The maximum limits specified below shall not be exceeded at any time.

(3)

A' minimum of two (2) condenser circulating pumps shall be in service cm Unit 2

during discharge except during Unit 2

shutdowns.

During Unit 2 shutdowns, the maximum discharge flow shall be 8.5 gallons per minute and a minimum flov eqivalent to (2) two service water pumps shall be in service on Unit 2 during discharge.

1aximuz Instant.

IL4iIte rninimum Frequency nf esm"Vi4t Sample e~a Dawem a"

Temperature °F Hydrazine 0001-015 81313-019 See (2) Above 75.0 ng/1 Daily Daily Instantaneol Grab

.('

25

'(a)

The permittee shall record the total flov (Code 74076-007) and tbe umber of hours of discharge (Code 81381-079) for each day of sample collection and/or the instantaneous. flov (Code OO05J-078) at the time of grab sample collection.

- (b)

. (c)

The report shall xiclude a-detailed explanation of any

-iolations of the limitation specifiaed ibove.

Sampling required only when discharging closed cooling witer system drainage.

V.

Discharge Serial No.

D01-C monitoring Location: --

==

Description:==

Unit No. 3 Dischairg'e (Discharge Code 1020Dd) maximum Daily Flov3 S 3J3,200,00 'gallons per day,..

Haximuz Temperatures 98 F Average Design Temperature 2ncreiase:' 18 F I*

(

T)

The taximu= temperature increiie" at the Unit No.

3 discharge above the intake witer te:beratur -that be 24°F.

I (2) The differential temperature increase at the Mnit No. 3 discharge above the intake vater,,eimperature 'way be increased to 30 F for a period`'not exceeding.24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />under' conditions of reduced coo'11ng'ver flo`.,' In the event the temperature differential exceeds 24 F, the Department 'of nvironmental Protection shall be notified in the monthly monit-oring riport.'

(3) "The'iormal operating procedures includet usually not more than 12 timces ayear. the elevi'tin ofibae intake vater temperature on

'each condenser by a thertal<backash process required for the control of sea mussels. 'The true t'eperatuie difference between the receiving stream snd' 4ischrg'e -evter 'shall be alloyed to zeze'ed 'the*permit limit for, brief periods during this treatment

schedule.

(4) Tree available chlorine, sawll ot be discharged In the condenser cooling-water-for store'than to' hours -n any, one day. Free available chlorine shal tot-be 'dlscEirged In thecndenser cooling water'of more than one tmitat-any cue time.

th-r Vi t

-;time.;.

s (5) Tbe pUtof the discharge' shall -not" be lets than 6.0 or greater than 9.0 (Code 00400-D12)'.'

.ssAt;*,

I 26 Maximum Minimum Instant.

Frequency Sample Partoeter Code Limits of Sampling Tvne Aquatic Toxicity, C0019-09A See paragraph Quarterly Daily Composite Acute 3.V.(6) belov Aquatic Toxicity, C0020-09A See paragraph Quarterly Daily Composite Chronic 3.V.(6) belov Flov 74076-007 Hourly Instantaneous pH 00400-012 Hourly (b)

Instantaneous Temperature 0F 00011-015 Hourly Instantaneous Free Available 50064-019 0.25 mg/l Veekly (c)

Grab Chlorine Free Available 50064-001 1386. kg/d Veekly (c)

Grab Chlorine (a) Report the following data:

1) Daily range of pH

2)

Daily range of flov

3)

Daily maximum temperature (OF)

4)

Daily minimum temperature

5)

Daily average temperature

6)

Monthly standard deviation of temperature

7) Daily maximum temperature increase

8) Daily minimum temperature increase

9)

Daily average temperature increase

10)

Monthly standard deviation of temperature increase

11)

Monthly maximum heat load (BTU/hr.)

12)

Monthly minimum heat load

13)

Monthly average beat load

14)

Monthly maximum rate of change of heat load

15)

Monthly standard deviation of heat load

16)

Total flov during chlorination period each sampling day

17)

Total daily flov (b)

The permittee shall monitor pH manually every four hours whenever the automated pH monitoring equipment malfunctions.

lc) Wbenever Unit 3 Is operating. weekly monitoring of free available chlorine shall be performed when chlorination of condenser cooling vater occurs.

Cd)

The report shall include a detailed explanation of any violations of the limitations specified above.

(6)

Effective upon issuance and thereafter a daily composite sample of the effluent shall not exhibit acute or chronic toxicity in the receiving waterbody.

(a) Compliance vith this permit condition shall be achieved when:

I..

C; C.) the,,Daly Flov of the discharge is greater than or equal to j,20D,OOO.gallons and there is no significant

'.?mortality in.s.daily cotposite sitple of the effluent ata..

concentration equal to or-treater than an OAEL -

I o

10?, a's 4 deterzinedmbythe asfail' methodology in ii iii.322 --

A0-3.(J)(7)(A) of. the. 3egulations of

, ComnectiutSati. Agencies; or

.Cii)otheao he dischirgei less than 43,200,000 gallonsg'and " the": LCc; O-value, of a 'daily composite sample of the effluent.s,. equal.to or greater than an LC > 67S.

In determining" LC' -value, five (5)

..,tef. _concentrations. --,.

duplicate, shal be utilired and the' L'C 5 v alue e shall !be determined by the computational Zmethod' (inoziall Distribution, Probit Analysis, Moi g AAverage sngle,

-Spearman-larber) which yields the sa2illest. '95 confidence interval and LC50

-,.value which is consistent vith the dose-Tesponse data.

(b)

Monitoring to, deter ie 'compliance 6

th this limit shall be

-performed aQuarterly

'(January,< s:Apzll.

July, October)

-folloving the

t.osicity testing protocol for static acute toxicity tests in' "eth'ods for Meassuring the Acute Toxicity of IEffluents to Fresbvater and Marine Organisms' (EPA 600/4-85/013) wit:!thee'folloving specifications:

(-.

i Ci)~zz~.~~i ab~- (5 days oltdor less) and £,rno2don

-ariecatusil3~i 5"days old),,shall be used as test organisms

'-(ii)

'-tttic nt satural seavateradjzusted to a salinity of 28-32 ippt- 'sha" l be'used, as sdilution water in the ltests..

(iii) Test duration shallbe^49 hours for bXsidopsis bahia and 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> for, Csrinodo Xazitsimus..

e v;..

s,.

l.

(c) Anyteot in which the aurvival. of tstorganlsms Is less than ntinet "'(90) 1percent 1n,I'ach reIlicite control test chamber obr failure tb aichieve test conditions as specified Sn ".Stction 22a430-3 CJ) (7)

CA) of ha Xegulations of ConAecticut State

Agencies, such as maintenance of

- 'appropriate environmental controls, shall constitute an invalid test and rill require immediate retesting. Tailure

to submit valid test results 'cozactitutes a permitviolation.

II

• 1

~ -

2

. I I

,,.1 ft :,

i,:

.J z

I

28 (d) Results of the toxicity tests required as part of this permit condition shall be entered on the Discharge Monitoring Report (DK1) for the month in which It vaS performed, using the appropriate parameter code.

Additionally, complete and accurate test data, including all supporting chemical/physical measurements performed in association with the toxicity tests.

as well as dose/response data shall be entered on the Aquatic Toxicity Monitoring Report form (ATkR). The ATHR shall be sent to the following addresss Aquatic Toxicity Connecticut Department of Environmental Protection Vater Compliance Unit

-122 Vashington Street Hartford, CT 06106.

(e) If any test result indicates that the maximum daily toxicity.

limit for the effluent has been exceeded, a second sample of the effluent shall be collected and tested as described above and the results reported to the Commissioner within 30 days of the receipt of the first set of test results.

(f) If any two consecutive test results or any three test results in a single year indicate that the maximum daily toxicity limit has been exceeded. the permittee shall immediately take all reasonable steps to eliminate toxicity vherever possible and shall submit a report for the reviev and approval of the Commissioner in accordance with Section 22a-430-3(j)(l0)(c) of the Regulations of Connecticut State Agencies describing proposed steps to eliminate the toxic impact of the discharge on the receiving waterbody. Such a report shall include a proposed time schedule to accomplish toxicity reduction.

(7) The discharge shall contain no net increase in any of the metal parameters listed below, except as allowed in accordance with this permit.

Sampling shall be conducted concurrently at both the intake and effluent at the frequency stated.

Minimum Frequincy Sample Parameter Code of Siaolin, T21e Total Copper 01042-028 Quarterly Daily Composite Total Laad 01051-028 Quarterly Daily Composite Total Nickel 01067-028 Quarterly Daily Composite Total Zinc 01092-028 Quarterly Daily Composite Ammonia - N 00610-028 Quarterly Daily Composite Total Suspended Solids 00530-028 Quarterly Daily Composit Surfactants-Anionic 38260-028 Quarterly Daily Compositlv Oil & Grease-T 70030-028 quarterly Grab o-.e
.

29 V.

Discharge Serial wo. OOlC-l Monitoring Location:

1

==

Description:==

Unit No.,3 Steam Cenerator Zlovdovn Discharge (Discharge Code'101060:)

Maximum Daily Flovs 1,400D000 gallons per day tl)

. t -.-.)

t,--12)

The temperature of thediiiucharge shall not exceed 2200F.

Prior to the use of et1anolamine anddiasminoethane the permittee must submit% for"the reviev and approval of the Comiiissioner an 'engi*ieering report on process modifications.

' ', Mauinum Instant.

_ :4r4it*

'Aiuiimum Frequency tnf snarbli"O 4sampli 'l-Parameter

?enerati~re;°F Total Suspended,

Solids p

Boric Acid Ethanolazine Dalminoei'hazne'-

0003.1-015 0.053O0l09.-,

00400-012-

-00698-056 C0196-019 '

C0195-019 464e (2) Above; Neekly 604 Y:g/1'

-Veekly Veekly See d~eiov eekly See Cd) Belov Grab Grab Grab Grab

(-a) he permittee... shall record the instantaneous flov (Code

-OOOS8-078) at tbe iieiof grb satple collection.

(b) The report shall include a 'detailed explanation of any Violations;of the limitations specified above.

(c)

Monitoring weekly for Vboric acid required only when boric acid treatment of steam generator occurs.

~..

C d) 'Gonitoring ~for ethanolamiie and; diJaminotthune

, shall be performed as-approve'dby th Cowiissioner in accordace with Paragraph V.CZ);;above'.

i-t

• x'

(

R) Radiation' souitoring "a" performed in accordance with Paragraph 2. aboves.'

' DiSerl Noa OOlC-00 a)

-onitoring Locaion-1 Deicriptioais ; Unit lb.

3 Steam Cenerator -Secondary. Side Vet Layup DraiageDicrge '(Discharge Code 227000a) sazimum Plov per Satch: '4*U,000'gaflons Maximum Frequency of Discbarges Two per day Expected Frequencts Twelve per.year (1)

A minimum of two (2) condenser circulating pumps shall be In service on Unit 3 during discharge.

Sp.

A,

(2)

Prior to the use of ethanolazine or diamenoethane the permittee shall submit for the reviev and approval of the Commissioner an engineering report on process modifications.

(3) The maximum concentrations specified belov shall not be exceeded at any time.

maximum Concentration Codev Per 8Ateh Minimum Frequency fte

,

• t14i=e Sample TsonF Voas"Otoir YS J-WYXIX

• -ur_

Bydrazine Ethanolamine Diaminoethane 81313-019 C0196-019 C0195-019 125.0 mg/l See td) Below See (d) Below Daily (c)

Crab (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 61381-079) for each day of sample collection and/or the instantaneous flow (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling required only when discharging steam generator secondary side wet layup drainage.

(d) Monitoring for ethanolamine and diatinoethane shall be performed as approved by the Commissioner in accordance with Paragraph X.(2). above.

Ce)

Radiation monitoring Is performed in accordance with Paragraph 2 above.

Y.

Discharge Serial No.

OO1C-2 Monitoring Location:

1 Descriptions Unit No. 3 Radiation Vast.

Test Tank Discharge (Discharge Code 253000n)

Mazimum Daily per Batch:

25,000 gallons Maximum Frequency of Discharges Two per day Espected Frequencys Two per day (1) A minzium of two (2) condenser circulating pumps shall be In service on Unit 3 during discharge except duing Unit 3 shutdowns. During Unit 3 shutdowns, the 3zimum discharge flow shall be 15.0 gallons per minute and a minimum flow eqivalent to two (2) service water pumps shall be in service on Unit 3 during discharge.

I

(

t Maximum Maxun Quantity Concl Code Per Bateb Per I

~

? ':

I.1 F

.I I.

1 00698-056 952.4 01132-019 OUM iiu entration, Frequency Bateb-h of: Samtblinr -

-: 'w Sample t..

e Boric Acid Lithium-Tot Specific Conducti%

p v *

.al pity ee.

-' ' eekly 00095-011 0040D-012 Weekly

,H,,

ekly '

\\..

.,^,..,.

fE :

Grab Crab Crab Grab (a) 'he permi"ttee shall record the total flov (Code 74076-007) and the number of hours of diechirge

`Code 82381-079) for eachday of sample collection.'

(b)T hie report -shall include a detailed explanation of any violations of the l-iitations specified above.

(c) Radiation :onitoring is performed in aragraph 2. above.

accordance vith A

2. Discharge Seria ND.01C-3 No.

Monitoring Locations 1

-Description:

Lov Level Radiation Waste Drain Tank Discharge

-Diuchirge-Code 117000a),

MaxiiumuFlov perat~ich: -5.0 gallons.

Maximum Frequency of Discharge:.. Four per diy sExpected Frequency: Four per day (1) The maxiticm concentration specified belovw 4all not be exceeded at any time.

(2) w

inimum of tvO (2) conmnser'circultitig pumpt shall be in service on Unit S during discharge if at any time the boric acid evaporator units are not functional-and the boric acid concentration exceeds 30 mg/i.,

~ -

&5azinu Mai i 1=12 Quantit

. Concentra~tion Ccadie-: -';- Per %atch

~--Per latehy,

.. Li.. :I. I.- (.

IXku1'

'. !4:.

Fripquency.,

.f Saln~l"n sample IVn&

Z.sv.-*

Zoric Acid !

00698-OS6 250.4:

Total Suspended

-. 00530-019

• SB 1 A dI 45.0 mg/i Weekly

• 14ikly Grab Grab pH 3

-- DOO&-2 M.Weekly Crab

)

as

^-s

()W The periittee hball record the total flow '(Code.74076.007) and the number of hours of dischIrge (Code: 81381-079)-for each day of sample collection.

Cb)

The report. sba ctlude a detitled explanation of any violations of the limitations specified above.

I (c) Radiation monitoring is performed in accordance with Paragraph 2. above.

AA. Discharge Serial No. OO1C-4 Monitoring Location:

1

==

Description:==

Unit No.

3 Makeup Demineralizer Backvash Discharge Including Feadvater System Vet Layup Drainage and Auxiliary Boiler Stack Drainage (Discharge Code 1060000)

Maximum Flow per 3atch: 80,000 gallons Maximum Frequency of Discharge:

One per day Expected Frequencys One per day (1) The maximum concentrations specified below shall not be exceeded at any time.

Maximum Concentration M.- aS.-I-Minimum Frequency flt e-1n 4"

Sample 9... a rOnA*A.

rn.c;r wu rr

-~l p;:

>;A;

-~

Total Suspended Solids Bydrazine pH 00530-019 4S.0 mg/i 75.0 zg/1 Veekly Veekly (c)

Weekly Grab Grab Grab 81313-019 00400-012 (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b)

The report shall include a detailed explanation of any violations of the limitations specified above.

tc)

Sampling veekly for hydrazine required only when draining the feedvater system wet layup or the auxiliary boiler stack system.

B3.

Discharge Serial No. OO1C-5 Monitoring Location:

1 Descriptions Unit No.

3 Auxiliary Neat Exchanger Discharge (Discharge Code 102000d)

Maximum Daily Floys 43,200,000 gallons per day (Service Yater)

(1) The temperature of the discharge shall not exceed 100° r.

Parameter Temperature WF Free Available Chlorine Code 00011-015 50061.-019 Maximum Instant.

Limits See (1) Above 0.25 ag/i Frequency of S5pl0n=

Weekly Veekly Sample Instantaneous Grab

(.

(a)

The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

33 (b) The report -shall inciude a'Idetailed explanation of any violgtions of tbe'limitation;'specified above.

CC. Discairge "Serial No. -OlCt-6 Monitoring Locations i Descriptions Unit No. 3 Condensatie Polisher Regeneration Vastevater Neutralization Tank Discharge Including Plant Equipment Vashvaters And Vnit' No.'1 S Eot' iit'r 'eating System

' Drainage (Discharge Code'10600006)

XMazicum Floi4v'*r 'itchb 25,000gallons Maximum Frequency of Discharge: 'Svo per.day Expected Frequency:?Tvo-perday. ;

(1) The tecperature of the discharge hll Unot-exceed 100 F."

(2) The pH of the discharge shaill iotbe less tian 6.'0 or greater than 9.0. (Code 00400-012)

(3) Prior to the use of ethanoinec nd'iaminoethasc the.permittee must submit for the. reviev and and approvil of 'the Commissioner

-n-engtineerinB report on procest modifications.

4' (4) tke'maz'itih concentrations specified belay shall not be ezceeded

• t

,E.-

I I-7 0A.

1.

.4 1c--

-'-Maimium -

Quantity Per Dav maximU Concentration

- ei r S a telh -

Minimum Frequency

..of 'iSam1iynt Sample

.; -rrvnPe

,..,.-Temperature F

PH

• Total Suspende

< }o~oal'Suspends

-Solids' 4'.

1

• Oil and Crease

, i0iland r

rease

.' By'dr'atsise,

-,S>

Diaminoethane

'"F j

N......

'2.

0 d

d 00011.015 0

16040-02.9 00530-019

~766SiO-056 4.24. kg tee (1) Above See (2) Above L5.0 tg/l

"Veekly r

brat Hourly'. -

Crab Veekly

_:_,,Grab:

-_V~ekly GCrab

-T 70030-056 388. kg Monthly Grab

-T 70030-019 20.0 mg/I "'

o'thly.r Grab.

3'8113-019 75.0 Mg/i Daily Cc)

Crab l'C0196..056 see (d) elov4 coiCss056 S See Mc) Jelow B

(a)

SThe permittee ahall record the t`tal -floV (Code :74076-007) and the tumber of hours of diucharie (Code. 4 l38lO79)e for

'-each daiyof sample collection nd/or the Istgntgneous'flov ode O00065807) at the time of gnb sample collection' I (b) 5The report; shall Include a ideitailed` explanatLon of any violations of the limitationsipecified above.L i

(c)

Sampling daily for boric acid and' ydrrzine is requiredonly when Uilt No.

3 Not Water Beating System is being discharged.

e

`34 (d)

Monitoring for ethanolamine and diaminoethane shall be performed as approved by the Commissioner in accordance vith Paragraph CC.(3) above.

(e)

Radiation monitoring is performed in accordance vith Paragraph 2 above.

DD. Discharge Serial No. 001C-6(a)

Monitoring Location:

1

==

Description:==

Unit No. 3 Steam Generator Chemical Decontamination Vastevater (Discharge Code 1060000)

Maximum Flov per 3atch: 40,000 gallons Maximum Frequency of Discharges One per day Expected Frequency& One per year (1) The pH of. the discharge shall not be loss than 6.0 or greater than 9.0. (Code 00400-012)

(2)

The maximum concentrations specified belov shall not be exceeded at any time.

(3)

Sixty days prior to performing chemical. decontamination of the steam generator the permittee must submit for the reviev and approval of the Commissioner an engineering report on process modifications.

Code Maximum Concentration Per Aatrh minimum Frequency

-of SAMDling Sampl Tvy e Parameter Biochemical 00310-019 Oxygen Demandl Chelmical Oxygen 81017-019 Demand Citric Acid 77666-019 Oxalic Acid 77081-019 Nitric Acid C0091-019 Permanganate C0109-019 Etihylenedismine 7J151-019 Tetraacetic Acid Hydrogen Peroxide 00139-019 Daily Daily Composite Daily Composite Daily Daily Daily Daily Daily Daily Formic Acid Copper-Total Iron-Total Cadmidm-Total Chroaiuz-Total Lead-Total.

Nickel-Total Zinc-Total Total Suspended Solids 77006-019 01042-019 01045-019 01027-019 01034-019 01051-019 01067-019 01092-019 00530.019 1.0 mg/i 1.0 mg/i 0.1 g/I.

1.0 &g/I 0.1 mg/i 1.0 us/I' 1.0 mg/I 30.0 mg/1 Daily Daily Daily Daily Daily Daily Daily Daily Daily Daily Hourly Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily ComposLte Daily Composite Daily Composite lange During(

Composite Grab 00400.019 SEE NOTE

11) ABOVE Oil and Grease-T 70030-019 30.0 mg/I Daily

-a). The permittee.,shall record the total flov (Code 74076-007) and the -number of hours of discharge (Code 81381-079) for each day-of. sample 'ollcctiot nd/or the 4ntantaneous flov (Code 00058-078)"it st'time of-grab sample collection.

(b) The report shilli-cIudeu a detailed explanation.of any violations of the lititations specified'above.

(c) esampling requied Ioaly when discharging steam generator SamplingSamlin rquiedirl r-chemical decontamination vastevater.

Sampling required only for piarmeters included in.the process -.approved by the Cocmissionerin accordance with Pargraph DD.(3) 'above.

EE. Discharge Serial No..OOlC-6(b)

Monitoring Location: l

==

Description:==

Unit No. 3 Auxiliary loiler Slovdovn Sump Dis charge

' ^.

(Discharge Code 117000a)

Maximum Daily Flov3 72,000 gallons (1) The temperature of ste discharge shall not exceed 210°F.

(22)

.-The -aximum concentration specified belov shall not be exceeded at any-time.

Maximum

,!inimu Instnt.

Frequency Sample Parapeter

-Code Limits of SamDling TVDe Temperature. F

.00011-015 See (1) Above Veekly (c)

Grab Hydrazine 813:3-019

• 75.0 tgfl

/

.. Veekly (c)

Grab (a)

The. permittee shall record the total flov (Code 74076-OD7) and the nunber ofhours'-of discharge (Code 81381-079) for each day of sample-1ollection.

(b)

The report shall include a detailed,-explanation of any violatiocns of the.limltatiois specified abOve., ",

cc)

Sampling weekly iitquiredacnlyibhen the auxiliary boiler Is in.operation..

-F.t. Discatrge Serial l

o. OOlC-.

montorigLoctondener otwell DisArge

==

Description:==

Unit 3o.

(Discharge Code 1170000)

• -Maximu Flovw er Zatchb 100,000 gallons Maximum-Frequency ofDiichargep:

One per day..

A

.- Expected Frequencys Five per year -

- ), The temperature of the dLscharge -shall not exceed 1120F.

36 (2) Prior to the use of ethanolamine and diaminoethane the permittee must submit for the reviev and approval of the Commissioner an engineering report on process modifications.

(3) The maximum concentrations specified below shall not be exceeded at any time.

Maximum Minimum Concentration Frequency Sample Parameter Code Per Batcb of Sam~ling'Ti Temperature 0F 00011.015 See (1) Above Daily (c)

Crab pH 00400.012 Daily (c) instantaneouu Total Suspended 00530-019 45.0 mg/i Daily (c)

Grab Solids Total Iron 01045-019 5.0 mg/i Daily tc)

Grab Hydrazine 81313-019 50.0 mg/1 Daily (c)

Grab Ethanolamine C0196-019 See (d) Belov Diaminoethane C0195-019 See (d) Below (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

tc)

Sampling daily is required only when condenser hotwell discharge occurs.

(d) Monitoring for ethanolamine and diaminoethane shall be performed as approved by the Commissioner in accordance with Paragraph FF.(2) above.,

GG.

Discharge Serial No. OO1C-9 Monitoring Locations 1

==

Description:==

Unit No. 3 Non-contaminated Closed Cooling Vater System Drainage Discharge (Discharge Code 102000b)

Maximum Daily 1evws 30,000 gallons per day (1) The temperature of the discharge shall not exceed 1000F.

(2)

The maximum concentration specified beloy shall not be exceeded at any time.

(3)

A uinrmum of two (2) condenser circulating pumps shall be in service on Unit 3 during discharge except during Unit 3 shutdowns. During Unit 3 shutdowns, the maximum discharge flow shall be 10.0 gallons per minute and a minimum flow eqivalent to two (12) service vater pumps shall be in service on Unit S during discharge.

(

Maxiimum Instant.

• t*4e.

MSinimun Fre quency S

• a t*

Sample AMA-S W&AJ-I AUr O

X Temperature F 00011-015 Nydrazine

_11313-019

• See Cl) Above:

I.

, V75.0 Mg/l

. 1.....

.1

-Dsily (cj Daily (C)

(-&)

-:The pernittee. shall record the instantaneous flov 00058-078) at ite time of:grab eample. collection.

(b)

The report shall include a detailed esplanation c violations of the limitations specified above.-.

(c) Sampling daily for,etperatuue and hydrazine equir Grab Grab (Code of any d,only I

I.W4M6 """4AU

%4UUww" h%.JWJd.MM W&F65&

affeb5w 4640A.5KC.

RH.

Discharge Serial No. 002-De" scr ition:-

Unit No.

Screen Vashbater Discharge (Discharge Code 1060o0n)

Reveiving Stream - Niantic zay Cza si Code 2000)

Present/Future aiter'Aual1`_

- d-SA/SA HAziZuz Daily Flov: 2 016 000 gallons

11. Discharge Serial No. 003

'Description -VUnittNo..2Screen Vashvater Discharge (Code 106000n)

Receiving Stream - Nianitic ay; (Basin Code 2000)

Present/Future Vater Quality Standard - SA/SA Ma0iDaily FIov - 2S4 ODD gSallons JJ. Discharge Serial No. 004 Description - Unit No. 3 Screen Vashvater Discharge ('Code 106000n)

Receiving Stream - Ninatic 'Zay (Basin:Code 2000)

Present/Future Vater Quality Standard - SA/SA Maximun Daily'llobv-5,760,000 gallons

. I.. Z,

• M. Discharge Serial No. 005-1 :

oniitoring Location: 1

==

Description:==

Unit No. 3.l n-contaminated Floor Drains, Trainsformer Yard Drs a

'Vater Vashes, Clean later Drazi.

aind Surface Vater lunoff (Discharge Code 1080000')

Receiving Stream: Long Island Sounidia Quarry Cut (lZasin Codte 260 Present/Future Vater Quality Standards. SA/SA Plow:

Intermittent t

(1) the maximua concentrations speefied below shall tot be exceeded at any time.o.

4

..bi~lu

,,Cede j :,

-~~~

COiliiad Grease-T 70030-019 Total Suspended' 00530-019

'Solids w*

-s.

Instant.

.Frequency.

'Limits' of Samling 20.0

/i

/

monthly (e) 30.0 mg/i Xontfily Samp'le

'r;D

• Grab Grab

38 (a) The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) 5he report shall include a detailed explanation of any violations of the limitations specified above.

(c)

Monitoring monthly required when oil separator discharge occurs.

LL. Discharge Serial No. 006-1 Monitoring Locations 1

==

Description:==

Unit No. 2 and Unit No. 3 Non-contaminated Floor Drains Including iorlc Acid From Steam Generator Treatment, Continuous Blovdovn From R. 0. Treatment of Makeup Water, Unit No. 2 and Unit No. 3 Diesel Generator Cooling Vater Drainage, Vater Softener Regeneration

Drainage, Unit No.

3 Control Building Cooling System.

Drainage, Vater Vashes, Clean Water Drains. and Surface Vater Runoff (Discharge Code 101060:)

Receiving Stream:

Niantic Bay (Basin Code 2000)

Present/Future Water Quality Standard:

SA/SA Maximum Daily Flow:

432,000 gallons (Excluding Surface Water Runoff)

(1) The maximum limits specified below shall not be exceeded at any time.

(2)

The pH of the discharge shall not be less than 6.0 or greater than 9.0 (Code 00400-012).

Average Monthly I 4 M80.

Maximum Instant.

I Jmleb Minimum Frequency

^*

~"

Sample Dew.rmaoea*

rA a

• O&--I

~

-%J t-h JJIIAyou Aquatic Toxicity, C0019-09A Acute Aquatic Toxicity, Chronic Boric Acid Oil and GreaseS-T Total Suspended Solids Copper-Total Lead-Total Nickel-Total Zinc-Total Total Residual Chlorine Ammonia-N Surfactants Anionic C0020-09A 0069B-001 70030-019 See paragraph 3.LL.(3) below See paragraph 3.LL.(4) belov See (f) below 10.0 mg/l 20.0 mg/l 00530-019 20.0 mg/1 30.0 ag/l 00400-012 01042-001 01051-001 01067-001 01092-0o9 50060-019 See (2) Above Quarterly Daily Composite Quarterly Daily Composite Weekly (d)

Daily Composite Monthly (c) Grab Sample Average Weekly (e)

Daily Composite Weekly (e) lange during Composite Veekly Daily Composite Veekly Daily Composite Veekly Daily Composite Veekly Daily Composite Weekly Grab Sample Average Quarterly Daily Composite Quarterly Daily Composite

.0474 kg/d

.2273 kgfd

.2207 kg/d

.401 kg/d

.12 mg/1 See Mf) below See (f) belov See (f) below See (f) below

.24 mg/1 00610-019 38260-019

II

-!(a);he pertittee %'shal1 record the instantaneous flov DD008078) at the Itimeof grab samplecollection.

07

)

.t-() - The report'e '

t all include.a detailed explanation of violations of the limitations specified above.

(c)

'kMonitoring monthly for oil',ant grease required then seDarator diseliarie ocncurt.

Code any oil

'd), Monitoriig weekly 'for boric acid required only when boric acid trittment ofwstiam gneator occurs.

(e) Monitvilng weekly.

.for:. total' suspended solids and pH shall only include dry veather flaos.

'f) She fily

l~iisshall apply for boric acid, total copper, total lead, total nickel and total zinc respectivelyl'Zorlc, Acid,4.lkg/d, Cu-.OP48 kg/d, Pb-.2546.

kg/d,-.'4lA kgfd,.2n-.802 kg/d.

-(3)' Effective upon issuaince and iiereifter a daily composite sample ofh effluent shall'n'otexhibit' acute' toxicity in the receiving waterbody. '

Ca) Dilution *quivalent,to 342,lDD 'gallons'-per hour (gph) is

, allocated to a zone-of :infl'uence for assimilation of

' toxicity. ' This,allocation shall be used to calculate the initreim-aste concentration'(CVC)"ac'cording to the formula:

maximum i1l fly' x100 (miu-daily1fbo 4-allocated zone of influence flow)

.,.'A..'-.

/

'*+t=*<S lbI7n".'Iu -of maximum 'daiy flat, the mean effluent flob rate

" -forthpreviois

'30joperati days-way.-be used to calculate t, e tinstreat waste concentration pfrovided the permittee

miintaiiitan accurate itecord 'of 'Oe',total flow and number of

.'-hours of discharge for eiachioerating day and provided that

.t 'fla raite for any one operating day used In calculating the mean does tot:..zceedi the 'mesa flow by more than

,,, tenty-five percent (2.5).

-c)- Compliance 'wth this peruit 'condition 'shall be achieved when

,,the LC value for the--effluent Is greater than three (3) in~

VS E 't C.';

j(d)

Monittoring to determine compliance vith this limit shall be performed -'Quarterly, *AJrnur*,'

April,; July, October) following the toxicity -te'sting: protocol foir static acute

-tox-icity-tests in, fMetbods for. Measuring the Acute Toxicity of ffluet to Fresh er and rn Organisms' (EPA

-,600/4.B85/013)

With thii'Nllot14g-cpec ficational Ci) Zrvs~idr kiabla'(CS days-old or less) shall be used as test organisms.

40 (ii) Synthetic or natural seavater adjusted to a salinity of 28-32 ppt shall be used as dilution vater in the tests.

(iii) Test duration shall be AS hours for MzuIIessLa abhla.

(4)

Effective upon issuance and thereafter a daily composite sample of the effluent shall not exhibit chronic toxicity in the receiving vaterbody.

(a) Dilution equivalent to 342,000 gallons per hour (gph) is allocated to a zone of influence for assimilation of toxicity.

This allocation shall be used to calculate the instream waste concentration (1VC) according to the formula:

IVC -

1MximuM daily flov x 100 (maximum daily flow + allocated zone of influence flov)

(b) In lieu of Maximum daily flov, the mean effluent flow rate for the previous 30 operating days may be used to calculate the instream waste concentration provided the permittee maintains an accurate record of the total flow and number of hours of discharge for each operating day and provided that the flow rate for any one operating day used in calculating the mean does not exceed the mean flow by more then twenty-five percent (25Z).

(c) Compliance vith this permit condition shall be achieved vhen the LC value for the effluent is greater than twenty (20) ti( es the IVC.

(d) Monitoring to determLne compliance with this limit shall be performed Quarterly (January,

April, July, October) following the toxicity testing protocol for static acute toxicity tests in Methods for Measuring the Acute Toxicity of Effluents to Yresbahter and Marine Organisms, (EPA 600/4-85/013) with the following specificationsi ti) livldoysis bahbi (5 dals old or less) shall be used as test organisms.

(ii)

Synthetic or natural seawater adjusted to a salinity of 28-32 ppt shall be used as dilution water In the tests.

(iii) Test duration shall be 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> for hlidjpti baia.

(5)

(a) in determining LS values, five 15) test concentrations.

in duplicate, shailobe utilized.

(b)

The LC5 0 value shall be determined by the computational method (Binomial Distribution, Probit

Analysis, Moving Average Angle.

Spearman-Zarber) which yields the smallest 952 confidence Interval and LCe s alue which is consistent with the dose-response data.

• 1 (c)

Any test in which the survival of test organicms is leos than ninety (9D) percent in eich replicate control test chber or filure to acieveptectcnditn'-i ecified i* -i'-Section' 22 of 430-3 (J)(7) (A) of - the Regulat ons of Connecticut State 'Agencies, s such as maziteniace of appropriate, unviOrn-ental; controls, 'shall constitute an invalid test and illi require immediate retesting. Failure to submit valid tst r'esults contitutes a percmt Violation.

' Rd)

Results ;-of *the toxicity tests required as part of this permit cooni.itri shall be.entered, on the Discharge Monitoring Report (DHR) for the onth in whch it was performed, using the appropriate parameter code.

..Additionally, complete and accurate test data, including all

-'supporting cheicalfphysical measurements performed in association with the..toxicity tests, as well as dose/response data shall be entered ii the Aquatitc

'xicity,-

onitoring Ueport form (ATIM).

The ATHR shall be sent to the folloving address:

-Aquatic Toxicity

. Connecticut Department of Enviro=nental Protection

Vater Coipl i' nce!iit 122 Vashington Steet BartfordCT 06106

(, e) If any test result indicates that the taxicum daily toxicity

- limit for the effluent has been exceeded, a second sample of the effluent shiall'-be" -collected -and tested as described above and the results reported-to the 2Cotmissioner within 30 days of the receipt of the first set of test results.

'f) 'lf-any tvo. consecutive test -results bor 'any" three test results in a single year indicate that. 2th'e; aium daily

"";-oicity

-lit is ~bean'exceeded,

-je permittee shall

-'mmediatelytakei ll'reiasoable -steps to eliminate toxicity whmreverfiposuible. and '5hall scubmit,^eport,for the review and approval of the Co=mlssioner in accordance Vith Section

- 22a-430-3(j)(l0)(c) of the Regulations,of Commecticut state

' ' '- Agencies,describing proposed steps to Glixiit'e the toxic Impact of the' dischttge on' the receiving vaterbody. Such a report shall include a proposed tise schedule to accomplish toxicity reduction.

'KX., Discharge Serial )io.'007i.

Descriptiot' Surfiac Vaier Ranoff, (Discharge Code lO0OOOn)

Receiving'Strre Niantic Bay via Settling Poid Ussatin Code 2000)

Preisnt/Future Vater-Quality Standard:

SA/SA Floy: Intemittent

• ~ ~~~

~

-:'1:;.*j'C

NN. Discharge Serial No. 008 Monitoring Location: 1

==

Description:==

Unit No. 1 Non-Contazinated Floor Drains and Surface Water Runoff Including Water Washes and Clean Water Drains (Discharge Code 1080000)

Receiving Stream: Niantic Bay (Basin Code 2000)

Present/Future Water Quality Standard: SA/SA Flovs Intermittent (1) The maxim=u concentrations specified belov shall not be exceeded At any time.

maximum Minimum Instant.

Frequency Sample Parameter Code Limlts of Sampling Tvye Oil and Grease-T 70030-019 20.0 mg/i Monthly (c)

Grab Total Suspended 00530-019 30.0 mg/l monthly Grab Solids (a) The perminttee shall record the instantaneous flow (Code 00058-07B) at the time of grab sample collection.

(b)

The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Monitoring monthly required only when oil separator discharge occurs.

00. Discharge Serial No. 009 Monitoring Location: 1

==

Description:==

Unit No. 2 Non-Contaminated Floor Drains, Fire Pump House Floor Drains, Water Washes, Clean Water Drains, and Surface Vater Runoff (Discharge Code 1080000)

Receiving Streazm Long Island Sound via Quarry Cut Present/Future Water Quality Standards:

SA/SA Flov:

Intermittent (1) The maximum limits specified belov shall not be exceeded at any time.

maximum minimum instant.

Frequency Sample Parameter Code Limits of Samn1ing TJRe Oil and Greast-T 70030-019 20.0 mg/1 Monthly Cc)

Crab Total Suspended 00530-019 30.0 mg/i Monthly Grab Solids (a) The permittee shall record the instantaneous flow (Code 00058-078) at the time of grab sample collection.

'43 (b) -The report shall include a detailed explanation of any violatlonc' of the *imitrations specified above.

(c) Monitoring monthly "required only vhen oil separator discharge occu'rs;

1.

PP.

I 11 Discharge Serial No. o11

.Description: Surface Vater Runoff (Discharge

Receiring Strean

cLon'g Island Sout--

'tre'snt/FutureYVter Qulaity-Stanrdard: SA/SA "Flo'v's' fsIntermittent

" -j z:
'

_J_

Lemc aoaOuUvn)

(.

QQ.

DischargeSerlalffo. 012 Detscription:s-SurfaceVater Runoff Including fire System flush Vater (Discharge&Codel0800Dn) eceivijig Streoa: fLong Island Sound' Present/Future Vater QualitySttandard: SA/SA Flov: Intermittent RR.

Discharge Serial.No.. 013.

Descriptions Surface, atetr-'Rnoff CDischarge Code 10800Dn)

Receiving Stream: Long Island Sound Preiefit/Future Vater Quality Standard: SA/SA ilov: 9 Intermittent c<

SS. Dischkrge Serial No. 014

'Description

Surface Vater Runoff (Discharge Code 108DOMn) eceivinig Streat:

Viantic Say -

Present/Future Vater QuilityiStandard: SA/SA

' lovai'Interzittent I.' Discharge Serial No. 015 J

%"Descriptions Surface' Vater.unoff Including'-Vaterwashes aid Clen Vater Drains- :(Discharge Code O08000n)

Receiving Streams Viantic Bay Present/Tuture Vater Qality;Standard:

SA/SA Ploy:

Intermittent UU.' Discharge Serial No. 016 Monitoring Locations 1

'6 ;*Description

Unit' No. 2 Non-contamziated floor Drains, Vater lashes, ClenO' iter,=Drins.

andSurface Vater Runoff (Discharge Code 1080000)-

Jeceivng:Strea:

)biaztic Ray Prestent/Future Vaiter 'Qu1aity Standards SA/SA

'los Intermittet

X1)

The aaxmumconcentrations specified below shaill ot be exceeded

atan tie

A4 Maximum instant.

Code 4fi4 t Minimum Frequency of RAM"ltna Sample T-Parameter Oil and Grease-T Total Suspended Solids 70030-019 00530-019 20.0 mg/i 30.0 mg/i Monthly (c)

Monthly Crab Grab (a)

The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of the simple collection and/or the instantaneous flow (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Monitoring monthly required only when oil separator discharge occurs.

W.

Monitoring Site No. 01 Unit Nos. 1, 2, and 3 Intakes (Bcefore Condensers) minimum Frequency sample Meter

Afo of ia&=lint I=

Flow Temperature F Total Copper Total Lead Total Nickel Total Zinc Ammonia - N Total Suspended Solids Surfactants Anionic oil a Grease total 74076-07 00011-015 01042-028 01051-02B 01067-028 01092-02B 00610-028 00530-028 38260-028 70030-02e Hourly Hourly Semiannual (a)

Semiannual (a)

Semiannual (a)

Semiannual (a)

Semiannual (a)

Semiannual (a)

Semiannual (a)

Semiannual (a)

Instantaneous Instantaneous Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Daily Composite Grab (a)

Concurrent accordance 3.V.(6)(b).

with April and October toxicity testing in with Paragraphs 3.3.(6)(b),

3.J.(6)(b),

and

4. (a)

On or before six months after lssuance, submit for the review and approval of the Comzissioner three (3) definitive (LC s) analyses of Discharge Serial Number OOlC-4.

These tests shal35ge conducted using daily composite samples of the discharge collected on separate weeks.

Testing shall be conducted following the toxicity testing protocol for static Acute toxicity tests in OMethods for Measuring the Acute Toxicity Of Effluents to Yreshwater and Marine Organisms' (EPA 600/4-85/013) with the following specifications:

0 I

i) mvUs.~id ii blea (5 days old or less) and Cvzrinodon

--' 'aetus'(30

+/-, S days old) shall be used as test organisms.

l

._ z 4.

.i

'S

.4 (ii) Synthetic orsnatural veavater adjusted to i -alinity of 28-32 ppt shall be used as dillutioniwAer in the -tests

-iii)- Teit"dirittionshall be,48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> for Mtigdpiptit kahin and96 ho'rs:for.

viruia..

'>7:

(iv) Each sample shall be saiilysed,-'for -the-following

. parameters: chromium, copper.

aid,'iickel,' sic. Iron, magnesium' manganese..cyanide taenable and total.

' S

,.total'o"il antd.grease:,total susiended -colids, total Uiesidual-chlorine, CODsurfactantsind ammonia.

.b) Mi)

In determining LC values, five (5) testIconcantrations, Sn

.,..duplicate, shall b utilized.

ThL al,edetri edb (ii)

LC 'al uebshallbethe

'coiputational method (g'l~iiomza'Dittribution, Probit Analysis, "7oVingX't'erage Angle, Spearman-Karber) which yields the stal1e t 951 confidence nntervl and LC;.

value which is, consistent Vith the dose-response data.-

St.

(iii).:..Any -test in which the survival Di tist iorgsnisms-iit iss

.than i

n ninety (90) percent In each replicate control test chamber or

'^!

,failure 7to'acbeievc;test. conditions as apecifiied<'inw Section

.o-

,22i-430-3(0)

(A~f) -,.,f; !Ithe,.

%egulat ons' of Coinicilcut.-state iieni-` %iS a^;Ait*ezMnc* 'of-ipo aenvironmental

controls, shall constitute an in'valid' test 'n.d!

' will require immediate retesting.

Failure to submit vaiid' 'test -results constitutes a perit iiolation.

5.

The permittee shall conduct or continue to conduct biological studies of

';.-te supplying aznd receiving viters, entrainment studies, and itake Imp&Eingement';.nlor'n~'b Jiudies shall_ Jzclude.stud1*s of Intertidal an subttidl tenthitt "o u'itl B, finfish. coalinities,'

A' d

entrained plankton and shall include detailed studlies'"of lohbiter poulitiona "and vinter flounder populations.

-i 4

,vC,,;_io,,4

6.

On or before July 31. l993 and annually thereafter, submit for the reviev and approval of the Co=mLssioner a detailed propoial rfor 'continuLng biological studies, entrainment studies, and.. l.p.eme t.

i.toring as required by paragraph S.

iZ

7.

On or before April 30, 1993 and sanually thereafter submit forthei review and approval of the Commissioner a

detailed report7 of-t6e1ongoing biological studies as required by paragraph 5 and a s pprov*d under paragraph 6

S

^

b6 S.

On or before January 31, 1993 submlt for the reviev and approval of the Commissioner a report on alternatives to reduce entrainzent of winter flounder larvae in accordance with 'Scope of York for Cooling Vater Alternatives Feasibility Study to Reduce Larval Vinter Flounder Enttrainent, May 1992.

9. (a) On or before February 28, 1993, submit for the review and approval of the Commissioner a scope of study for investigating the impact of this facility's macrofouling control practices on Iiantic Day.

At a minimum, the scope shall includes (i) A proposal to determine the area in which chlorine can be detected and the duration of the impact.

Cii) A proposal to determine the mixing characteristics of chlorine from the condenser cooling water discharge with the receiving vater.

(b)

On or before November 30, 1993, submit for the reviev and approval of the Commissioner, a final report describing the results of the Impact Analysis Study conducted according to the approved scope of study.

10. On or before June 30, 1993 submit for the review and approval of the Commissioner a scope of study report to investigate minimization of the use and discharge of ethanolazine at Unit No. 2.

11. On or before June 30, 1994 submit for the review and approval of the Commissioner an engineering report on minimization of the use and discharge of ethanolamine at Unit No. 2 in accordance with Paragraph 10 above.

The report shall include specific recommendations and a schedule for

-implementation.

This permit shall expire on December 14, 1997.

The permittee shall comply with the folloving sections of the Regulations of Connecticut State Agencies which are bereby incorporated Into this permit:

Section 22a-430-3 General Conditions (a)Definitions (b)General Cc)Inspection and Entry (d)Effect of a Permit (eCluty Cf)Proper Operation and Maintenance (g)Sludge Disposal (h)Duty to Mitigate (i)Facility Modifications% Notification (J)Nonitoring, Records and Reporting Requirements (k)Bypass (l)Conditions Applicable to POTYs (M)Effluent Limitation Violations (Upsets)

I 47

" ",, Jj

.H

~

(n)

Enf orc ement (o)PResouirce Conservati Cp)SpSill Prevention an (q)Instrumentation, Al Cr)Equalization d Control a=s, Flov Recorders r

(

f,.

- I
,

1,-,,1 I.

e. 'I.

I I..,..

i.

- r: -

I., I -.

1,

.1

, " '7

'- 7 i.;-i,.;. -

a 8

22g-430-4 Procedures and Criteria (a)Duty to Apply (b)Duty to Reapply.

(c)Application Requirements (d)Preliminary Reviev (e)Tentative Determination (f)Draft Permits, Fact Sheets (g)Public Notice, Notice of Hearing (h)Public Comments (i)Final Determination CJ)Public Hearings (k)Submission of Plans and Specifications. Approval.

(l)Establishing Effluent Limitations and Conditions (m)Case by Case Determinations (n)Perzit Issuance or Reneval (o)Permit Transfer (p)Permit Revocation, Denial or Modification (q)Variances (r)Secondary Treatment Requirements Cs)Treattent Requirements for Metals and Cyanide (t)Discharges to POTWs - Prohibitions Your attention is especially dravn to the notification requirements of subsection (i)(2), (i)(3), tj)(6), (J)(9)(C), tj)C1l)(C). (D), lE). and (F),

(k)(3) and (4) and (l1)2) of Section 22a-430-3.

This Permit requires the payment of an annual compliance determination fee as set forth in Section 22a-430-7 of the Regulations of Connecticut State Agencies.

The Commissioner reserves the right to aake appropriate revisions to the permit in order to establish any appropriate effluent limitations, schedules of compliance, or other provisions which may be authorized under the Clean Water Act or the Connecticut Ceneral Statutes or regulations adopted thereunder, as amended.

The permit as modified or renewed under this paragraph may also contain any other requirements of the Clean later Act or Connecticut General Statutes or regulations adopted thereunder which are then applicable.

Entered as a Permit of the Commissioner on the 14th day of December, 1992.

Robert E. Moore Deputy Commissioner APPLICATION NO.89-379 PERMIT ID. CTO003263 ORDER ID. VC

I 4-1 STATE DEPARTMENT OF OF CONNECTICUT ENVIRONMENTAL PROTECTION bM XINMpR MODIFICATION

-0 VW Northeast Nuclear Energy Company

'o NortheastUtilities Service Company P.O. Box 270

Martford, CT 06141-0270 Attention:" 'RLC. Chevalier. Vice-President RECEIVED I. I

1.

i
-I - -

R.G.C.

. I s -

I Re: 'DEP/VPC No. CTOD03263..

Tovn of Vaterford I

Long Island Sound Vatershed Pursuant t' the provisions of paragraph SV(2), 3X(2). 3CCC3), and NPDES PermitNo...CTODD3263 issued to Northeast Nuclear Energy Company December 14. 1992';and a request'dsted July 16, 1993 from Northeast Service 'Company, the fo-loding is hereby authorized:

SPFF2) of (NNEC) on Utilities NNEC may use and discharge (for purposes of corrosion control) ethanolamine

(CTA) it Unit 3 of ;the` Iillstone 'Nuclear Pover Station at the folloving discharge locations and vithin the' limitations 'lited below:

DnSN

_trti_

n O~lC-I a).

001C-6 DOIC-8 I~

2 5.

.r n g / l

--- i5.0 Dg/i "30.0kg/batch 3.0 mg/1 NNEC/AUSCO shall undertake daily monitoring (grab sample) for ETA and report the results to the Comzisuioner on a monthly basis, conslstent with the existing reporting requirements for ETA use at Unit 2 of Millstone.'

This minor permit modification Is issued under the authority of the Commissioner set forth in Section 2l2-430-4(p)(5)3)j..of the Regulations of Connecticut State -Agencies o this 'the 3rd day-of Deceber' 1993.

~..

-Robert E.,Xoi Deputy COJmil Sent RRR Application No.89-379 Permit No. C0 D03263; )inorkModificition s Ion r

FTJI THAT

'I 1,

THIS WOCUMENT Of THE ORIGINAL.

.- I C

.1 DEPAR TP N F ' N I O 0 I A MAHATEC INT BLUREAU OF &ATER, Elm Stuec:

I Hanford. C?

An S4.al 4?OPporwulY I£apJo 06106 yre I I I :

I.

I

.I.

1.., I

STATE OF CONNECTICUT DEPARTMENT OF ENVIRONMENTAL PROTECTION MINOR MODnrlCATION RECEIVED Northeast Nuclear Energy Company C/D Northeast Utilities Service company DEC 9 93 P.O. Box 270 Hartford, CT 06141-0270 R.G.C.

Attentiont R.O. Chevalier, Vice-President Res DEP/VPC No. CT0003263 Tovn of Vaterford Long Island Sound Vatershed Pursuant to the provisions of paragraph 3V(2). 3X(2). 3CC(3j, and 3FF(2) of XPDES Permit No. CT0003263 issued to Northeast Nuclear Energy Company (KNEC) on December 14. 1992 and a request dated July 16. 1993 from Northeast Utilities Service Company. the following is hereby authorized:

NNEC may use and discharge (for purposes of corrosion control) ethanolamine (ETA) at Unit 3 of the Millstone Nuclear Pover Station at the folloving discharge locations and vithin the limitations listed below:

tn-lxr53 Concentration OOlC-l 15.0 mg/l COIC-ita) 5.0 mg/i OO1C-6 300.0 kg/batch OOC-8 3.0 mg/i NNEC/NUSCO shall undertake daily monitoring (grab sample) for ETA and report the results to the Commissioner on a monthly basis, consistent with the existing reporting requirements for ETA use at Unit 2 of Millstone.

This minor permit modification is issued under the authority of the Commissioner set forth in Section 2.2&-430-4(p)(S)(B) of the Regulatiens of Connecticut State Agencies on this the 3rd day of Decenber

. 1993.

Robert E. Moore Deputy CommissionerI CERTIFY THT THIS OMENT IS A TRUE Y

TI E ORIGINAL.

Sent RRR lA I'u Application No.89-379 Permit No. CT0003263: Minor Modification Wr DEPARTIM OF EKV[RO<EK7AL PROTECTIOh, BlREAU OF UATER KANAGEMENT rckd ?aptf J l o^.,r