ML20196D089

Annual Environ Operating Rept for 870915-880914

ML20196D089
Person / Time
Site:	Sequoyah
Issue date:	09/14/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8812080200
Download: ML20196D089 (8)

Text

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ENCLOSURE 1

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4 TENNESSEE VALLgY AUTHORITY j SEQUOYAH NUCLEAR PLANT (SQN)

ANNUAL ENVIRONMENTAL OPERATINC REPORT september 15, 1987, through September 14, 1988 j 1. In accordance with Technical specification (TS) 5.3.C. facility design and j operational changes here reviewed for potential effect to the environment. A study of facility design and operational changes from September 15, 1987,

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through September 14, 1988, that could have affected the environment was performed. projects considered to have potential impact on the environment j included (1) those involving excavation, consttvetion, or asbestos removal; and j (2) those resulting in new or increased discharges to outside drains. The study identifled and documented a basis that the design and operational changes did not involve an unreviewed environmental question. A copy of this study is i attached (attachment 1).

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2. In accordance with TS 5.4.1, the folicwing reports have previously been i submitted to WRC as specified in the SQN National pollutant Discharge

) Elimination System (NPDES) permLt No. TN 0026450:

) Status Report on the Investigatlon of the impact of SQW on Dissolved oxygen 1

Levels in Chickamauga Reservoirl April - September 1987, submLtted October

) 110, 1987 l

l Report on the Rasults of plankton Studies conducted in 1986 and 1987 as part of the operational Stage Nonradiological Aquatic Monitoring at SQN,

} Chickamauga Reservoir, submitted January 29, 1988 l

! Dissolved oxygen stuoy activltles originally planned for fiscal year (FY) 1988 l were delayed until TY 1989 because of the uncertainty about having a unit in i operation throughout the sumer as explained in a letter to the Tennesseo j Division of Water pollution Control dated May 16, 1988.

3. The following infomation is provided as required by TS 5.4.1 I

j a. All environmental technical specification (ETS) noncompliances and the .

corrective action taken to remedy them.

There were no ETS noncompliances during the reporting period,

b. Changes made to applicable State and Federal permits and certLfLcationst I

Air pollution Control permit No. 4150-40301005-041 was allowed to expire

, because the gasoline storage tank and dLesel fuel storage tank at SQN is no j longer an active project.

) WPDES permit No. TN 0026450 for SQW expired on March 31, 1988. A permit renewal application was submitted on October 1, 1987. Because a timely and /

complete remit renewal application was submitted, the expired PemLt will /

remain in force untti the effectLve date of a new permit (in accordance I with 40 CFR Part 122). ,

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On June 21, 1988, the Tennessco Division of Water Pollution Control approved the use of chlorine with a blodispersant and bromine in the essential raw cooling water system to control microbiologically induced corrosion (MIC).

c. Changes in station design that could involvo a signifleant environmental impact or change the findings of the Final Environmental Statement (FES).

As concluded in attachment 1, there have been no facility design or operational changes sineo September 15, 1987, that have resulted in an unreviewed environmental ques'.lon. ,

d. All nonroutine reports submitttd in accordance with ETS Section 4.1.

A fishkill in the SQN yard draintge pond occurred on March 9, 1988.

Approximately 78 fish died because ofsnknown causes; however, algal toxicity was suspected.

A second fishkLil of approxinstal) 1,000 to 4,000 fish was observed in the SQN yard drainage pond on Apr LL 12, .'988. No definite cause was determined; however, it was suspected that fish in the inlet channel and possibly within the yard ? ping l systemn were overcome by releases from the powerhouse that contained ammonia and*.tydrazine in concentrations that could have been toxic bef ore being eleed with the contents of the pond.

On July 11, 1988, approximately 10,000 to 11,000 dead fish were discovered in the SQN diftuser pond. The apparent cause was thermal stress.

On August 1, 1988, approximately 278 dead fish were discovered in the SQW intake forebay. The apparent cause was low dissolved oxygen (DO) levels:

An additional 16.271 dead fish were obocrved during the period of August 3 through August 13, 1988. By the end of August. DO 1cvels in the reservoir and plant cooling system had improved and the fishkill had subsided.

During the period of August 14 through August 24, a total of 382 dead fish was observed, and from August 25 through September 7 only four dead fish ,

were counted.

Copies of the reports for the above incidents are provided in attachment 2.

o. Changes in approved ETS.

No changes to the ETS have been approved: and no changes were requested during the period from September 15, 1987, to September 14, 1988. No response to ETS change request 87-05 has been received.

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,, ATTAc'Mrn 1 STU4Y OF SEQIT'Oi 'R U.' PLANT (SQN) '

DESICW AND OPERATIONAL ClONG7S BETUIr.a u p F.R 15, 1987, AND SEPTEMBER 14, 1988 IOR EFFEC t. N di" L.WIRONMENT Facility design and operationa.1 changes pade during this report period have been rCviewed for potential to affect the environment as described below. The critoria i used to identify those projects wiih a potential for environmental effects included (1) those involving excavation, const-uction, or asbestos removal; and (2) thoso ,

resulting in new or increased dischargee to outside drains.  ;

1. The following projects were reviewed for potential impact to the environments

a. Workplans -- A total of 621 workplans was cualuated in accordance with the i criteria specified above. Based on this evalustion, the following projects were reviewed to determine their environmental si:nificance.

- Replacerent of the insulation in the main steam room

- Installation of lighting, surface ground mat, and drain lite for the 500-kV switchyard addition in bay 1

- Installation of an effluent flow totalizer for the low volume waste treatment pond

- project to provido additional return and supply air and rebalance the heating, ventilation, and air conditioning system in the computer room

- Addition of a continuous sodium hypochlorito feed system for essential raw cooling water

- Modification to the plant sewage systems

- Construction of containment for the sodium hypochlorite storage tanks in the hypochlorite building

- project to flush a nitrogen Line with freon TF to remove oLL -

b. Special Tests -- Thirty-four special test instructions (STIs) were issued or revised during the report period. Based on an evaluation of these instructions in accordance with the abovo criteria, none of the STIs have a potential for adverse environmental effects,

c. Temporary Alterations -- Thirty-one temporary alterations wore evaluated in accordance with the criteria specified above. Based on these evaluations, the following projects were reviewed to determine iheir environmental significance:

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3 2-4 j - Lifting a wire to prevent the ERCW ecreen wash pumps from

running continuously

- The addition of a strainer / filter to the high crud filter bypass line in the condensate domineraliser building

- placement of a jumper to allow the recirculation of fuel oil, for alxing purposes, in the diesel generator seven-day tank at levels where pump operation is normally inhibited

. 2. Design and operational changes with a potential for causing new or increased discharges to outside drains, including runoff from excavation, were reviewed and determined to be within the scope of the SQN WPDES permit.

3. Monthly discharge monitoring raports submitted as required by the SQW NPDES permit were reviewed. Permit excursions were attributed to either equipment malfunctions or operatLonal errors and determined to be within the purview of the WpDES permit and associated environmental evaluations.

In summary, there have been no factitty design or operational changes from Ocptember 15, 1907, to September 14, 1988, that have resulted in an unrevicwed cnvironmental questLon.

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., TENNECOEE VALLEY AUTHORITY CH ATTANOOG A. TENNESSEE 37401 l

SW 1578 Lookout Place DE8 051988 U.S. Nuclear Regulatory Comission  ;

ATTN: Document Cont rol Desk l Washington, D.C. 20555 Centlesen [*

In the Matter of ) Docket Mos. 50-327 f

Tennessee Valley Authority ) 50-328 f i

SEQUOYAH WUCLEAR PLANT (SQN) - ANNUAL ENVIRONMENTAL OPERATING REPORT }

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The enclosure contains the Annual Environmental Operating Report for SQN I i for the period fron September 15, 1987, through september 14, 1988. This i report is submitted in accordance with Appendix B technical  :

spectflcation 5.4.1.  ;

, Please direct questions conceming this issue to M. J. Burrynski at (615) 843-6172.

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! Very tmly yours, ,

i TENNESSEE VALLEY AUTHORITY

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R.hp'hley,MandsDf%

Cri i Wuclea'r Licensing and I

Regulatory Affairs unclosure cet See page 2 I

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cc (Enclosure):

Ms. 3. C. stack, Assistant Director for Projects TVA Projects Divlsion

't.3. Nuclear Regulatory Commission one White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Director for Inspection Programs TVA Projects DLvision U.S. Nuclear Regulatory Commission Region 11

101 Marietta Street, NW, hJite 2900 Atlanta, Georgia 30323 Sequoyah Resident inspectot Requoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy. Tennessee 37379 i

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ENCLOSURE K NUAL ENVIRONMENTAL OPERATING REPORT (S52 881115 816) 4 e

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4 '. pR L BF (44 880408 805 5N 1578 Lookout Place APR 08 E29 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Wachington, D.C. 20555 G,..tlemen:

) Docket Nos. 50-327 In the Matter of 50-328 Tennessee Valley Authority )

SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 AND 2 - APPENDIX B, ENVIRONMENTAL TECHNICAL SPECIFICATIONS - FISHXILL Enclosed is my follow-up report to the March 9, 1988 fishkill, in accordance i with the requirements in Appendix B, Environmental Technical Specificat ons, subsections 4.1.1 and 5.4.2.

The initial notification required by subsection 5.4.2.a was made by telephone to F. McCoy, K. Barr, and T. Rotella at approximately 1600 eastern standard time (EST), March 9, 1988; 1630 EST, March 9,1988; and 0830 EST, March 10, 1988, respectively.

If you have any questions, please telephone it. R. Harding at (6W) 870-6422.

Very truly yours, TENNESSEE VALLEY AUTHORITY 0:igincl Sipc5Dy E. L. Cridicy R. Gridley, Director Nuclear Licensing and '

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' Regulatory Affairs Enclosure ec: See page 2 i

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, Enclosure

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On March 9, 1988. 78 dead fish were discovered in the yard drainage pond.

This event was reported to the State of Tennessee, Division of Water Pollution Control, and NRC as required by SON Environmental Technical Specifications.

The drainage pond water was sampled / analyzed for various parameters to Preliminary and final analyses indicate tne ascertain a cause for the kill.

potential hydrogen activity was within limits and the total residual chlorine concentration was less than the detectable limit (less than 0.1 parts million).

parts per billion of hydrazine that is below the aquatic toxicity threshold.

TVA considers this event to have no environmental impact because the fishkill was confined to onsite treatment impoundment and the receiving water w4s not impacted.

Based on TVA's investigation into this event, the exact cause of the fishKill Water analysis could is unknown and probably occurred over a period of time. Analytical data that is not uncover a causative agent for the fishkill.

available support the hypothesis that the fish were probably stressed by tne

~.he State has concurred algae blooms occurring over the previous three weeks.The State has informed with TVA's results.

incident closed.

There is no further corrective action required for this incident.

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U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 AND 2 - APPENDIX B, ENVIRONMENTAL TECHNICAL SPECIFICATIONS - FISHKILL Enclosed is my follow-up report to the April 12, 1988 fishkill in accordance with the requirements in Appendix B. Environmental Technical Specifications, subsections 4.1.1 and 5.4.2.

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The initial notification required by subsection 5.4.2.a was made by telecopy

) to the Document Control Desk on April 12, 1988.

If you have any questions, please telephone M. R. Harding at (615) 870-6422.

Very truly yours, TENNESSEE VALLEY AUTHORITY Original Signed By R. L. Gridley l R. Gridley, Director -

i Nuclear Licensing and I

Regulatory Affairs Enclosure cc: See page 2

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Enclosure 0

On April 12, 1988, the Sequoyah Nuclear Plant (SQN) Environmental This event was.Section supervisor discovered a fishkill in the yard drainage pond.

reported to the State of Tennessee, Division of Water Pollution UponControl, the and NRC as required by SQN Environmenta! Technical Specifications.

discovery, the supervisor requested that chemistry personnel collect samples of pond effluents. Additionally,Preliminary TVA biologists were contacted to initiate an analysis results yielded a ,

investigation of the fishkill. ,

hydrazine concentration of 52 parts per billion (ppb), pote.ntial hydrogen lon activity (pH) 8.21, ammonia 843 ppb, dissolved oxygen 6.8 parts per million -

(ppm), and total residual chlorine less than 0.1 ppm.

The On April 13, 1988, TVA biologists began an investigation of the fishkill. '

biologist estimated that 3,000 to 4,000 green sunfish were killed--most wereMost between one to three inches in length. 11-13, 1988). The most been dead for approximately one to three days (April probable cause of the fishkill is considered to have been toxic concentracions of hydrazine and ammonia in the yard drainage pond inlet ch The long, narrow channel routes f.vm the resulted from its limited volume.

Turbine Building sump discharge to the east inlet of the yar drainage pond.

Normally, the drainage of effluents from the Turbine Butidin i to the yard drainage pond to ameliorate a high pH problem caused by alg photosynthesis in the yard drainage pond. .

provides collection, blending, and monitoring for yard and st yard drainage pond or low-volume waste pond to receive effluents from tha Turbine Building sump.

During the preliminary investigation, it was suspected that effluents from a steam generator and/or auxillary boiler Dailydrain to the journals yard were drainage reviewed to pond possibly attributed to the fishkill. It determine if these systems were drained before and during the fishkill.  :

has been determined that 3,800 gallons of waste was drained from auxiliary boilers A and B on April ll, 1988. Hydrazine concentrations The No. 3 steammeasured 224 pper generator for and 136 ppm respectively in boilers A and B. to the unit 2 was intermittently drained (approximately 35,000Thegallons) hydrazine Turbine Building sump in the April 8-9, 1988 period.

concentration in the steam generator on Aprl) 8, 1988, was 0.88 ppm.

TVA has concluded that the steam generator and boiler drains, coupled with low flows of the yard drainage systems and limited inlet channel volume, that were created localized concentrations (predominantly hydrazine and ammonia)Also, probably toxic to fish. created low or nonexistent dissolved orygen Duringcontent at the y inlet pipe and channel areas resulting in asphyxiation of the fish.The State has con this results.

event, no NPOES limits were exceeded.The State has infor.ted TVA tha There is no further corrective action required for this incident.

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. L44 880803 801 SN 157B Lookout Place

'AUG 031988 U.S. Nuclear Regulatory Commission ATTH: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-527 Tennessee valley Authority ) 50-328 SEQUOYAM NUCLEAR PLANT (0QN) UNIT 3 1 AND 2 - APPENDIX B, ENVIRONME!!TAL TECHNICAL SPECIFICATI0tl - FISHKILL Enclosed is TVA's follow-up report to the July 11, 1988 fishkill in accordance with the requirements in Appendix B, Environmental Technical Specifications, subsections 4.1.1 and 5.4.2.

The initial notification voquired by subsection 5.4.2.a was made by telephone to C. F. Could at approximately 1235 eastern daylight time, July 12, 1988.

If you have any questions, please telephone M. A. Cooper at (615) 870-6549.

Very telly yours.

TEtTNESSEE VALLEY AUTHORITY R. Cridley, Manager

• Nuclear Licensing and Regulatory Affairs Enclosure ces See page 2 1

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. s on July 11, 1988, approximately 1,500 dead fish were discovered in the diffuser pond. This event was reported to thh State of Tennessee Division of Water Pollution Control and URC as required by SQN Environmental Technical specifications. The total number of dead fish was subsequently revised to between 90,000 and 11,000. The species killed were threadfin and gizzard shad ranging from 2 to 4 inches in length with 3 inches dominating. A TVA biologist investigated this event and concluded the apparent cause for the fishkill was the m.al stress. This conclusion was based on the following facts and observations:

1. Shad are particularly sensitive to temperature changeJ and high water temperatures.

2. 1.arge sunfish were observed feeding on the dead shad and did not appear to be stressed.

3. If any toxic substances had entered the diffuser pond, this would have occurred via the yard drainage pond or low-volume waste treatment pond.

Both of these ponds support fish populations; however, there was no evidenco of fish distress.

4 The daily traxitrum dif fusee pond discharge temperatures for July 10,11, and 12 were 91.4 degrees Fahrenheit (F), 91.2 degrees F, and 90.5 degrees F respectively.

• >s dead fish were not removed from the pond but were allowed to decay in place. There is no further corrective action planned for this incident.

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c, T Ub L44 880825 811 SN 157B Lookout Place AUG 4;51988 U.S. ttuclear Regulatory Contaission ' '

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ATTtt: Document Control Desk klashington, D.C. 20555 Centlement

) Docket Nos. 50-327 In the Matter of 50-328 Tennessee Valley Authority )

SEQUOYAH HUCLEAR PLANT (SQti) U111T31 AND 2 - APPENDIX B, ENVIRotTHEUTAL TECHNICAL SPECIFICATION - FISHXILL Enclosed is TVA's report of the August 1,1988 fichkill in accordance with the requirements in Appendix B, Environmental Technical Specifications, subsections 4.1.1 and 5.4.2.

If you have any questions concerning this matter, please telephone M. A. Cooper at (615) 870-6549.

Very truly yours, TENNES3EE VALLEY AUTHORITY Original Signed Bh R. L. Gridley l

R. Gridley, Manager Nuclear Licensing and Regulatory Affairs l

Ette1oCUt*e l ec: See page 2 t

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",' ENCLOSURE On Hond,ay, August 1,1988, SQH personnel reported dead fish in the plant intake forebay. They requested that the situation be investigated and d:cumented. A crew led by fishery biologist Wayne Wilson arrived at the _ l intake forebay at approximately 11 a.m. They' surveyed the entire shoreline of the forebay and found the largest concentration of dead fish at the end of the i intake channel near the pump screens. A few, including two large, flathead actfish, were found in the area near the end of the cooling tower return etnal. No dead fish were noted in the open-water area of the forebay, but a number (perhaps 200) of rmall (approximately 2 inches) gizzard shad appeared to be breaking the surface in a possibly stressed condition in the area --

immediately behind the skimmer wall. The soft parts of many dead corbicula were floating throughout the forebay and were concentrated by the thousands at the end of the intake channel. There were no fish observed floating in the Tennessee River.

The water in the forebay was dark in color, with dissolved oxygen (DO) cardings ranging from 0.5 milligrams per liter (mg/1) at the surface to 0.2 eg/l at the bottom and temperature readings ranging from 25.2 degrees ccntigrade (C) at the curface to 24.4 degrees C at the bottom. Approximately 450 dead fish were observed, of which 268 were concentrated at the end of the intake channel. Approximately 400 were gizzard shad (2-12 inches), 57 were freshwater drum (6-10 inches), 3 were channel catfish (12-18 inches), 2 were fitthead catfish (20-24 inches), and one was a blue catfish (15 inches).

The fishkill was undoubtedly related to the extremely low Do levels in the '

intake forebay. The water in the forabay is drawn under the skimmer wall from ,

the deepest strata of the reservoir where essentially anoxic conditions ,

prevail. Data collected as part of the Chickamauga D0 study on July 26, 1988, ct Tennessee River Markee 484.5, just outside the skie=ce wall, show DO readings of 0.1 to 0.2 mg/l in the bottom five msters of the reservoir.

l It was evident from the condit'.sn of the dead fish that they did not all die I ot the same time. Apparently taey enter under the skieree wall into the farebay, become trapped, and cannot survive the critically low Do levelc. The floating bodiac of the fish are then drawn into the intake canal whore they ccncentrate near the punp screens. This pattern will undoubtedly continue '

until higher Do levels are restored in the Lower strata of Chickamauta l Racervoir. , j 4

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