ML20132F144

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Discusses 961210 Meeting Re Service Water Performance & Impact of Zebra Mussels on Plant Operation.List of Attendees & Licensee Presentation Encl
ML20132F144
Person / Time
Site: Arkansas Nuclear  Entergy icon.png
Issue date: 12/17/1996
From: Dyer J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To: Hutchinson C
ENTERGY OPERATIONS, INC.
References
NUDOCS 9612240138
Download: ML20132F144 (45)
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AR LINGToN. T E XAS 760118064 DEC 171996 C. Randy Hutchinson, Vice President Operations Arkansas Nuclear One Entergy Operations, Inc.

1448 S.R. 333 Russellville, Arkansas 72801-0967

Dear Mr. Hutchison:

SUBJECT:

MANAGEMENT MEETING TO DISCUSS SERVICE WATER SYSTEM PERFORMANCE This refers to the meeting conducted in the Region IV office on December 10,1996. This meeting related to service water system performance.

At the meeting, the licensee summarized the impact of zebra mussels on plant operation.

Significant increases in zebra mussel population were experienced in 1996 for the first time. For the conditions experienced, the licensee concluded that the unit service water systems had remained operable and that the impact on the emergency cooling pond inventory control from sluice gate leakage was limited. The licensee also summarized their monitoring and treatment programs and their corrective actions. Additionally, plans for future inspections were presented. The licensee's presentation is included as to this letter.

In accordance with Section 2.790 of the NRC's " Rules of Practice," Part 2, Title 10, Code of Federal Regulations, a copy of this letter will be placed in the NRC's Public Document Room.

Should you have any questions concerning this matter, we will be pleased to discuss them with you.

Sincerely, h

OV J. E. Dyer, Director Division of Reactor Projects

Enclosures:

1. Attendance List
2. Licensee Presentation 9612240138 961217 PDR ADOCK O 33 P

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l Entergy Operations, Inc. cc:

j Executive Vice President

& Chief Operating Officer Entergy Operations, Inc.

P.O. Box 31995 Jackson, Mississippi 39286-1995 l

Vice President Operations Support Entergy Operations, Inc.

P.O. Box 31995 Jackson, Mississippi 39286 Manager, Washington Nuclear Operations ABB Combustion Engineering Nuclear Power 12300 Twinbrook Parkway, Suite 330 Rockville, Marylar, t 20852 County Judge of Pope County Pope County Courthouse Russellville, Arkansas 72801 Winston & Strawn 1400 L Street, N.W.

Washington, D.C. 20005-3502 Bernard Bevill, Acting Director Division of Radiation Control and Emergency Management Arkansas Department of Health 4815 West Maikham Street, Slot 30 Little Rock, Arkansas 72205-3867 Manager Rockville Nuclear Licensing Framatone Technologies 1700 Rockville Pike, Suite 525 Rockville, Maryland 20352

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Entergy Operations, Inc. DEC I 71996 i

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Project Engineer (DRP/C)

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Leah Tremper (OC/LFDCB, MS: TWFN 9E10) i i

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ENCLOSURE 1 MEETING:

Arka;.sas Nuclear One

SUBJECT:

Service Water System Performance DATE:

December 10, 1996 ATTENDANCE LIST (PLEASE PRINT CLEARLY)

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i ENCLOSURE 2 Agenda o

I n trod u ctio n....................................... Dwig h t M im s Director, Nuclear Safety e

O ve rview........................................... C h a rlie Zim m e rm a n Plant Manager, Unit 1 e

Zebra Mussels.................................. ReNae Partridge l

Supervisor, Chemistry e

Condition & Corrective Actions......... Bobby Day Manager, Engineering Support e

Recent inspections & Future Plans.. Tim Mitchell Manager, Unit 2 System Engr e

Service Water Integrity Program...... Chris Shively Sr. Lead Engineer t

e Closing.............................................. C harlie Zim merman Plant Manager, Unit 1

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Introduction

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Dwight Mims Director, Nuclear Safety i

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Plant Manager, Unit 1 i

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Overview e September 1992 - Zebra mussels detected in Lake l

Dardanelle e September 1993 - Zebra mussels noted in Unit 1 CW f

bays e No significant increase noted until March 1996 e July 1996 - High dP alarm on Unit 1 SW strainers e September 1996 - Inspections confirmed that the numbers of zebra mussels had increased and excessive sluice gate leakage noted -

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i Safety Relevance e Sluice gate leakage I

Impact on ECP inventory control from sluice gate leakage was limited i

e SW strainer dP SW system performance impact from pump discharge strainer delta P due to sediment deposits in the service water bays

- Zebra mussel shell fragments are primary concern

- Strainer dP setpoint conservatively set

- Post event reviews show no operability concern i

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Zebra Mussel Monitoring Program e

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Monitoring program was initiated in 1993 l

Samples are collected and analyzed in accordance with the EPRI guideline Population (At the intake)

- Veligers - 18/ liter f

- Juveniles - 600,000/m2 f

- Adults (>4mm)-23,000/m2 shoreline e

Service Water Bioboxes were installed in the mid-1980's to monitor the effectiveness of chemical treatment To date no living zebra mussels have been found in the bioboxes I

or SW system I

in August 1996, a control biobox was installed to monitor raw water i

in the intake 1

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i Current Treatment Program i

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Sodium hypochlorite fed continuously to the inservice bays l

Combination of sodium hypochlorite and sodium bromide fed continuously during summer months when lake pH is high (>8.0)

A nonoxidizing biocide is available to use as needed

- Idle SW bays

- ECP e

Unit 1 Circulating Water Application is restricted by environmental permit Two bays are treated at that same time each day with sodium hypochlorite/ sodium bromide for 20 minutes

-Followed by treatment of the other two bays each day with sodium hypochlorite/ sodium bromide for 20 minutes Treatment is designed to control microbiological growth in the j

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Zebra Mussel Control Methods i

e Antifouling Coatings e ChemicalTreatment e HotWaterTreatment e Electrical Control Strategies

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Condition Description and Corrective Actions i

t Bobby Day Manager, Engineering Support 4

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Conditions e A zebra mussel infestation of the circulating water (CW) system bays on Unit 1 and of the intake structure forebays on Unit 2 The degree of infestation was graduated from very heavy on

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Unit 1 "B" CW to light in front of Unit 2 No live marine growth observed in the SW system or established live marine growth in structures downstream of the service water (SW) bay inlets

- Verified by component inspections and Unit 1 emergency l

cooling pond (ECP) suction line video inspection

- Routine monitoring and treatment for zebra mussels in the ECP i

- SW bay inspections i

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Corrective Actions e improve conditions e Limit recurrence of conditions t

e Cope with conditions e Reduce plant sensitivity to conditions e Review other systems for impact of conditions e Use/ share industry operating experience e Review SAR for impact from conditions i

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Improve Conditions e Drained and cleaned all Unit 1 SW bays during 1R13 e Inspected and cleaned all Unit 2 SW bays with divers e Drained and cleaned Unit 1 "B" and "C" CW bays j

during 1 R13 o Cleaned loose material from Unit 2 forebays with divers e Cleaned sediment basin twelve feet in front of Unit 1 intake structure with sloping transition to remaining sediment deposits o Scheduled dredging of entire sediment basin in first quarter 1997 j

Limit Recurrence of Condition l

e Established intake structure inspection schedule to monitor mussel development and initiate future cleaning as required e Continue ECP and connecting piping monitoring e implemented strainer trending program e Evaluating:

n Chemical injection relocation in Unit 2 forebays Chemical injection relocation in Unit 1 SW alcoves Coatings

- Test patch installed in Unit 1 CW bay Flotsam skimmer wall at lake edge Heating Electrical measures (Cathodic protection)

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Cope with Conditions i

e Demonstrated effectiveness and feasibility of timely operator action in reducing sluice gate leakage e Demonstrated effectiveness and feasibility of timely operator action in addressing strainer dP i

e Refine criteria for strainer dP operability e Pre-staged equipment for strainer cleaning e Revised Unit 2 traveling screen cleaning frequency l

Reduce Plant Sensitivity to Conditions e

increased Unit 1 strainer area Holes in Basket Bottom f

o Evaluate strainer basket redesign to increase area e

Evaluate strainer redesign

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e Evaluate hydraulic modifications to SW bays to limit availability of strainer clogging material Experiment currently running at Alden Labs j

e Evaluate modifying sluice gate operation to minimize turbulence on I

transfer from lake to pond e

Evaluate adding internal lake side sluice gates e

Evaluate revising sluice gate leakage test to demonstrate effectiveness of operator action e

Evaluate provision of ECP make-up possibilities Evaluate traveling screen and traveling screen wash system e

improvements 1

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Xovember Inspection Results i

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Tim Mitchell I

Manager, Unit 2 System Engineering I

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t Unit 1 Follow-up Inspection Results i

e Service Water Bays - November 1-11,1996 Smalllocalized area of sediment

- Ectoprocta in alcove

- Small rocks in "C" bay

- Fine silt No live marine growth in chemically treated areas No cleaning performed due to minimal accumulation e "C" Circulating Water Bay - November 1,1996 Area is chemically treated for approximately 20 minutes per day n Approximately 1 inch accumulation near traveling screens A couple of zebra mussel shells and light s5diment observed on lower rubber seal of open sluice gate Fine coating of silt on floor l

l Unit 2 Follow-up Inspection Results e Service Water Bays - November 5-6,1996 Zebra mussels attached to inside of sluice gate (area not accessible during previous cleaning and inspection efforts)

Small clumps of unattached zebra mussels on floor Approximately 4 gallons total of material removed from all 3 bays during cleaning e Forebay - November 6,1996 Outside chemically treated area Approximately 5% coverage of zebra mussels on floor, primarily in one corner of the traveling screens with a few clumps A few Asian clams on floor n Wall coverage of zebra mussels (same conditions as original inspections) n Approximately 61/2 gallons of material removed from floor

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Emergency Cooling Pond Inspections e Quarterly

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Inspections for biological or marine growth e Annually Biological chemical treatment of ECP Fish eradication to limit maximum growth 1

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Conclusions e Only minor sediment and zebra mussel accumulations noted e Some silt amounts discovered could be the result of traveling screen carryover or zebra mussels detaching from the forebay walls e Chemical treatment appears effective in the SW bays e inspections and cleaning are an effective means of preventing recurrence e

4

Future Inspection Plans e January 1997 e April 1997 Unit 2 SW bays Unit 2 Outage Unit 2 Forebay

- Unit 2 Forebay intake Canal

- Unit 2 SW bays

- ECP lines e March 1997

- Enhanced biological and Unit 1 "B" CW Bay sediment controls Unit 1 SW Bays implemented as available Unit 1CW bays

- Drain and inspect

- Enhan'ced biological and

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1 Future Inspection Plans e July 1997 Unit 1 "B" and "C" CW bay inspections in an outage of sufficient i

duration Unit 1 SW bays as determined prudent with summer pump operation Unit 2 inspections will be evaluated based on corrective actions taken in Spring 1997 o October 1997 Extensive evaluation and cleaning similar to Spring 1997 e November 1997 Draindown inspection and cleaning of Unit 1A" and "D" CW bays o 1998 Inspections inspections will be similar to 1997 Recurring maintenance activities will be developed l

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l SWIP Development e

1980 - Biofouling of heat exchangers (IEB 81-03) e Initial SW system action plan i

e 1982 - Study of long term options completed Repair / replacement program chosen e

1987 - Evolution into SWIP i

o 1988 - Full-time system engineer assigned e

1991 - SWIP coordinator assigned e Application of GL 89-13 requirements l

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SWIP Status 6

i e Active and evolving e Transformation from reactive to proactive actions e Formal program supported by procedures e Managementinvolvement I

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i Service Water Successes e System condition is known and improving through monitoring i

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e Pipe condition has significantly improved e Specific obstacles addressed Early 1980's Continued through the 1990's i'

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Service Water Challenges l

i e Open loop lake water cooled design provides continuous challenges to all system functions e Current action item list f

Unit 1 I

- System boundary valve reliability i

- Decay heat cooler capacity margin Unit 2

- System pipe cleaning i

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- Chemical control program enhancements *

- Pump discharge strainer evolutions

- Evaluate expansion to include associated systems 8

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SWIP Summary e 16 years of program evolution e Accomplished significant programmatic and specific system issues e Continually challenged by the water source e SWIP has proven to be a cost effective, efficient program to address these challenges l

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Charlie Zimmerman Plant Manager, Unit 1 t

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