ML20215B980

Advises That on 870122 & 0326,oil Spills Amounting to Less than 5 & 10 Gallons,Respectively Occurred.Caused by Water Being Pumped Out of Condenser Pit Into Unit 3 Turbine Bldg Floor Drains at Rate Which Exceeded Oil/Water Separator

ML20215B980
Person / Time
Site:	Millstone
Issue date:	06/02/1987
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Deland M ENVIRONMENTAL PROTECTION AGENCY
References
D01530, D1530, NUDOCS 8706170537
Download: ML20215B980 (18)

Text

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4' NORTHEAST UTILITIES o.n.r.i ome.. . s.m.n str t. s mn. conn.cticut 1 iY.'NNu$sNc

""*""**'"'**" P.O. BOX 270 L ' J U 7.' **Ne*N.e*an',

a., HARTFORD. CONNECTICUT 061410270 (203) 665-5000 Ii .

June 2,1987

_D01530 Mr. Michael Deland, Regional Administrator U.S. Environmental Protection Agency Region 1

3. F. Kennedy Federal Building Boston, Massachusetts 02203

Dear Mr. Deland:

Millstone Nuclear Power Station Oil Spill Report On January 22, 1987 and March 26, 1987, at Northeast Nuclear Energy Company's (NNECO) Millstone Nuclear Power Station, oil spills amounting to less -

than five gallons and approximately ten ga!!ons, respectively, into or upon navigable waters of the United States occurred. Since the two spills occurred (EPA) regional administrator, containing information out Is required.

(NUSCO), on behalf of NNECO, hereby submits the following

1. Name of Facility:

i Millstone Nuclear Power Station 2.

Name of the Owner or Operator of the Facility:

Northeast Nuclear Energy Company P.O. Box 270 Hartford, Connecticut 06101

3. Location of the Facility: "

The Sound, facility is located Waterford, on a 515-acre site at Millstone Point on Long Island Connecticut.

4.

Date and Year of Initial Faci!!ty operation:

The station was first placed into operation in December 1970 with the commercial operation of Unit 1.

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' Mr. Michael Deland D01550/Page 2 ~ j June 2,1987 5.I -

~' Maximum Throughput: Storage and Handling Capacity of the Faci!!ty and Normal Daily:

<  : The Millstone . site. has a total oil storage icapacity of approximately 550,000 gallons. uThis total oil storage is located in many tanks, no one of

which'Is larger than 35,000 gallons, and includes all types of oils including. -)

~. lubricating oil, transformer oil, diesel fuel, house heating oil, jet fuel, etc. .

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All site. deliverles of oil are by truck- having maximum . capacity 'of 8,000 are gallons; transfer operations .of greater. than 16,000 gallons per day .

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Normal dally usage is approximately 5,260 gallons.

6.

-f Description of Facility: i Millstone Nuclear Power Station is a three-unit facility located on ~a 515-acre site at Millstone : Point on Long Island . Sound in Waterford, Connecticut. ~ The site. boundary includes Route 156 on the north, Long-Island Sound on the south, Jordan Cove on the east, and Niantic Bay on the west. .See attached map for genera! layout.

7.

A Complete Copy of the SPCC Plan With Any Amendments:

See attached.

8.

The Causes of the Spills, including a Failure Analysis of the System or Subsystem in Which the Failure Occurred:

The first spill occurred on January 22,1987, when water was m pu' ped out of a condenser pit into the Unit 3 turbine building floor drains at a rate that .

exceeded the capacity of the oll/ water separator. This caused 011 to be carried

-Island over Sound. to the water side of the separator and be discharged into Long p The second spill occurred on March 26, 1987, when a float valve malfunc-l' tioned in the Unit 1 Main Generator Hydrogen Seal Oil System causing oil to be vented onto the roof of a maintenance shop. A rainstorm subse-quently carried the oli into the storm drain system and into Long Island Sound.

9.

Corrective Action and/or Countermeasures Taken, include a Description of Equipment Repairs and/or Replacements:

- a. 3anuary 22,1987, oil spill.

,1) An oil boom was deployed to contain the oil. .

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i Mr. Michael Deland D01530/Page 3 June 2,1987 (i- -

^2) .

The set points of the sump. level alarm switches associated with ,

the'oll/ water separator vault were revised to provide earlier j warning ~ of an Impending overflow condition within the vault.

3)-

Operating procedures were revised to incorporate cautions regarding the flow capacity of the oll/ water separator vault..

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b.. March 26,- 1987, oil ipill. k l

1): An oil boom. was deployed to contain the oil.

2)

- Absorbent materla!'was placed around'the roof drains and the catch basins.

3) '

An open 55-gallon drum was placed under the seal oil system to.

catch any further discharges. t 4)

The malfunctioning float valve was ' removed, cleaned (debris on valve seat), inspected, tested, and verified to be operable.

10.

Additional Preventive Measures Taken or Contemplated to' Minimize the Possibility'of Recurrences

a. January 22,1987, oil spill.

1)

Design changes are being evaluated that will increase the flow capacity of the oll/ water separator.

2)

The existing cover of the oll/ water separator will be replaced with a grating to allow increased monitoring and maintenance.

b.. March 26,1987, oil spill.

1)

The Hydrogen Seal Oil System will be drained and cleaned during the upcoming refueling outage. -It is suspected that debris in the system contributed to the float valve failure. .

2)

The oll system screens will be cleaned and a preventive maintenance program will be initiated to schedule recleaning during each future refueling outage. This action'will maintain system' cleanliness to prevent recurrences.

By copy of this letter, NNECO, pursuant to 40CFRil2.4(c) and Section 22a-450

• of the Connecticut General Statutes,is providing the Water Compilance Unit of the Connecticut Department of Environmental Protection with a copy of all information sent to the EPA Regional Administrator.

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Mr. Michael Deland-D01530/Page 4 June 2,1987 Sdould you - have any -questions, please ' call Mr. Thomas P. Arcari, NUSCO Generation Facilities Licensing, at (203) 665-3713. '

Very truly yours, NORTHEAST UTILITIES SERVICE COMPANY As Agent for Northeast Nuclear Energy Company Ns u E. 3.'p4foczka y Senior Vice President Attachments cc: Mr. Richard Barlow, Director - i Water Compliance Unit

~ Department of Environmental Protection 122 Washington Street Hartford, Connecticut 06106 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 W. T. Russell, Region I Administrator R. L. Ferguson, NRC Project Manager, Millstone Unit No. 3 J. T. Shedlosky, Resident Inspector, Millstone Unit No. 3 l

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{ SPILL' PREVENTION CONTROL & COUNTERMEASURE PLAN (SPCC)

Millstone Nuclear Power Station l Rope Ferry Road

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Waterford, Connecticut.

This plan describes th'e procedure adopted to prevent the discharge of oil into the navigable water of the United States, as required by 40 CFR.

'Part 112 Environmental Protection Agency. 011 Pollution Prevention, Non transportation related onshore and offshore facilities.

Originally prepared: January 1974 Latest revision: April 1986-i .-

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• t GENERAL -

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The Millstone Nuclear Power Station contains one General Electric Boiling Water (eactor of 682 MWe capacity presently operating, one Combustiorf Engineering Pressurized Water Reactor of 850 MWe capacity presently cperating, and one Westinghouse Pressurized Water Reactor of 1150 MWe capacity scheduled for commercial operation in May 1986.

The Station, situated on approximately 500 acres of land, was first placed in operation in late '1970. The site is located in the town of Waterford, Connecticut, on the north shore of Long Island Sound and on the east side of Niantic Bay. A site plan is attached.

The outside oil tank storage is listed in Section 2A. Additional oil is

. contained outside in tanks and equipment in volumes in varying quantities including both equipment fuel oil tanks and lubricating oil.

This plan has been prepared by: Mr. Ralph Brisco The latest revision was made by: J. Richard Robertson The person responsible for oil spill prevention and control is:

Station Superintendent - Millstone 8

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~A. Previous Spill Events -

e .!.rI This facility has not experienced an oil spill into navigable water -

.. in the twelve _ month period prior to the effective date of the .

I regulations. 7The last; spill event into navigable water occurred on.

8/21/85, when approximately I gallon of #4 cil was released after overfilling a storage tank. A similar spill had occurred earlier in  !

June 1985. Corrective action was taken to prevent' reoccurrence of similar spills and information has been submittal to the E.P.A.

Administrator. Additional recommendations to.enchance spill control measures at the site are' undergoing an' engineering evaluation.

These recommendations are listed as an amendment to this plan.

B. Potential for Equipment Failure Experience at this facility-does not indicate a reasonable potential for equipment failure that could result in quantities of oil released to navigable water that could not be easily controlled and contained.

C. Spill Prevention and Containment-

1. Transformers are located on concrete retention barriers large enough to hold the entire oil contents plus ten percent of the transformers. i

2. Underground tanks and transformer oil tanks are filled by truck. Liquid levels in these tanks are always measured before filling. Yard drains in these areas are directed to oil separating sumps.

3. Sorbent materials are kept onsite to control any spillage.

4. Any spills that may be experienced would be responded to by implementing Northeast Nuclear Energy Company's Emergency Procedures.

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.- D.. Conformance with Applicable Guidelines )

1. _ Facility Drainane Site Plan (Attached) N I (a) Inplant'Draina2' I

i Plant floor drain systems in areas where there are potential 3 sources of oil leakage are collected in oil separating sumps. Samples of the sump contents are visually inspected periodically to determine the presence mf oil.  !

(b) yard Drainace Yard drain systems are also collected in catch basins. In l order for oil to reach these yard drain basins, there would have been equipment failure, (transformer /switchgear) which in most cases would have alarmed in the control room.

2. 011 Containino Equipment (a) Bulk Storage Tanks (Buried Metallic Tanks)

(i) Unit I has four (4) house heating oil tanks, two (2)

Jet fuel tanks, and one (1) diesel oil tank of 25,000 gallons each. These tanks are coated with a Bituminuous coating and are provided with cathodic protection, (ii) Unit 2 has one (1) 25,000 gallon Jet fuel underground storage tank that is coated with a Bituminous coating  !

and is provided with cathodic protection, (iii) Unit 3 has (2) 25,000 gallon house heating. oil underground storage tanks having Bituminous coatings and cathodic protection, and (2)-35,000 gallon '

underground vaulted storage tanks for diesel oil storage.

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(iv) The services group has 8,000, 2,000 and 500 gallon 1 underground tanks for storage of house heating oil.

Additionalundergroundtanksarea4,000ga.13d gasoline tank, a 3,000 gallon waste oil tank, and a ,

, 1,000 gallon diesel oil tank. '

'{ (v) Each' tank is precision tested on a schedule that *'

at a minimum is in compliance with Connecticut regulatory requirements. In addition the tanks are visually inspected, when possible,,,from inside the tanks whenever tank cleaning is necessary.

(vi) Above ground tanks are located inside buildings and are observed on a periodic basis as part of the general plant surveillance rounds.

(vii) Tank level indications (a) Unit 1, 2 and 3 tank level readings are taken daily by the operating shift personnel _and recorded for surveillance purposes.

(b) Level devices are checked every refueling outage.

(viii) Plant effluents, other than those sumps mentioned in D. 1., are processed through the radioactive waste system. Minimum processing is filtration into a i sample tank from which a laboratory sample is taken ,

l for analysis prior to a discharge permit being )

prepared. Any oil present in the samples is readily detectable. The presence of oil in a sample requires that the liquid be reprocessed.

(ix) Visible oil leaks from joints, valves, etc., are promptly repaired.

(x) Because of heavy construction activities at certain times, temporary oil storage in drums and equipment occurs in areas having low potential for causing oil spills.' '

v, (b) Other 011 Containino Equipme~nt Apart from the oil storage facilities mentioned id e, the following equipment contains oil in excess-of 660 gallons:

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(1) The. gas turbine electric generator lube oil storage

-tank is 730 gallons. This unit is located in a building supplied with flood gates.

(ii) Electrical equipment in the Unit 1,,;, transformer yard containing oil is as follows:

Main Transformer 22,506 gallons Normal Station Service Transformer 4,425 gallons Auxiliary Transformer 11,000 gallons Emergency Station Service Transformer 1,540 gallons i (iii) Unit 1 Turbine lubricating equipment containing

, oil is as follows:

Main Turbine Lube 011 Reservior 7,100 gallon capacity Dirty Lube 011 Tank 7,200 gallon capacity Clean Lube 011 Tank 7,200 gallon capacity Bowser Filter Operating Level 953 gallons (iv) Unit 1 Diesel Day Tank 1,610 gallons

-(v) Unit 2 Diesel Supply Tanks (2) 13,600 gallons each (vi) Unit 2 Turbine. lubricating equipment containing oil.is as follows:

Main Turbine Lube 011-Reservoir 6,400 gallon capacity-Main Turbine tube 011 Reservoir 20,000 gallon capacity Steam Generator Feed Pump 011 Tank (2) 1,020 gallon capacity each (vii) Electrical equipment in the Unit 2 transformer yard i containing oil is as follows:  ;

Main Transformer 17,470 gallons L Normal Station Service Transformer 16,172 gallons L

Reserve Station Service Transformer 4,800 gallons  !

(viii) Unit 3 Diesel tube 011 Tank (2) 2,300 gallon each

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.. . .r L(ix)' Unit 3 Turbine lubricating equipment containing oil-is:

' Turbine Clean 011 Tank-12,0,0ggallen Turbine Dirty 011 Tank 12,500 gallon

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' Turbine 011 Reservoir 7,000 gallon

, Turbine Oil Conditioner' '1,000 gallon 5

Turbine Waste 011 Sump .

1,000 gallon

-(x) Electrical equipment in the Unit 3' transformer yard: '

Main Transformer (2) 6,500 gallon each Normal Station Services Transformer (2) 3,353 gallon each Reserve Station Services Transformer (2) 3,290 gallon'ench  !

(xi) Portable equipment' fuel oil tanks (2). 275 gallon each l for onsite construction equipment 1 (xii) 55 gallon drum oil storage locations with adequate protection for spill prevention

'(xiii) Spare (Main Transformer) 15,120 gallons Spare.(Reserve Station Services 14,000 gallons Transformer)

'(c) Underaround Oil / Water Separators Several underground oil / water separators. exist at various locations for treatment of equipment floor drains on Units 1 & 2.

Five additional underground oil separators have been installed i on Unit 3.

3. -Facility Transfer Operations (1) Buried piping has a Bituminous coating.  !

Cathodic protection is utilized where practical. Buried {

pipe will be inspected whenever a section of the pipe is i exposed. Examinations and repair will be initiated as l required. '

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(ii) Pipelines removed from service will be drained and isolated using blank flanges.  !

(iii) All above ground valves and pipelines will be inspected ,

. annually for preventive maintenance and observed daily by the operator during rounds.

s (iv) Vehicular traffic in the general area of the filling station for the underground tanks is limited to-authorized vehicles for security reasons. Signsareprovid[dhowarn drivers of the location of sensitive above ground piping.

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4. Facility for Tank Truck Unloadina (1) Unloading procedures require that plant personnel be present to ensure that the oil is delivpred to the correct tank and that there is sufficient space in the tank to receive the shipment. Plant personnel monitor the unloading and have absorbent materials available to them in the event of a small spill. Communications are maintained verbally and through use of local telephone.

.(ii) Procedures require that the fill pipe be locked immediately after hose disconnect from the truck. The truck unloading station is located within an electrically operated gate and the truck cannot leave without permission from the security officer on duty.

E. Inspection and Records Written procedures are provided where required. Results of all inspections will be recorded on appropriate data sheets and filed for reference.

• F. Security )

d (i) The facility is located within a fenced and monitored site. 4 I

Gates are locked shut and under the control of the security force. -

(ii) The starter control of all oil pumps is under the control of the operating personnel. -

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(iii) The loading connections are secured when not in use. Control of these connections is with the operating personnel.

(iv) Adequate lighting is provided for security and operatf6g. reasons.

(a) Operating personnel observe the facility at least once per '

p shift. *

• (b) The entire facility is monitored by security patrol.

G. Personnel Training and Spill Prevention Procedures (i) Personnel Training is provided via written p ocedures in -

the operation and maintenance of equipment.to prevent the discharge of oil. Essential personnel are also instructed in the applicable pollution control laws and regulations.

(ii) .The Unit / Station Services Superintendents are responsible and s

j accountable for oil spill prevention in their respective areas.

These Superintendents report to the Station Superintendent.

(iii) Spill prevention briefings for the operating personnel will be conducted annually to assure adequate understanding of the SPCC Plan.

l (iv) All training related to SPCC will be documented in each person's training record. I l

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011 Spill Clean-Up Service - List of Con _ tractors  !

-. r East Coast Environmental Services, Inc. (203) 469-2376 ,

454QufnnipiacAvenue New Haven, CT 06503 Hitchcock 011 Pollution Systems (203')334-4812 l 40 California Street Bridgeport, CT

-New England Pollution Control, Inc. (203) 777-0339

.7 Edgewater Place-East Norwalk, CT 06855 Sealand Environmental Services, Inc. (203) 735-1817 i 326 Derby Avenue Derby, CT 06418 l

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' AMENDMENT T0' MILLSTONE

. SPILL PREVENTION CONTROL & COUNTERMEASURE PLAN' 7" gr_

The folkowing' items are additional corrective u meas' res that wi11' enhance

-the Spill Prevention. Control Plan. The engineering evaluations and

r corrective action will'be implemented by January 17.-1989. These items

'are being tracked internally through issuance of Contra 11ed Routing (CR 6191). '

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1. Removing the underground waste oil storage tank to an above ground location away from high traffic areas and away from area yard drains. Designated oil drum storage only in certain areas'.

Determine a better location and provide containment for rolling equipment fuel oil. tanks.

2. Providing an alarm function for station oil / water separators which would provide early warnings of potential oil spills, Unit 3 separators already-have that function.

3. Fabrication of a small. spill barrier at the Unit 2 Diesel Oil 1 i

Storage Tank fill location. '

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4. Modifying N.P.D.E.S. discharge pathway 006 in Unit 3, to allow l

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for containment of oil spills if they should occur. A permanent sea broom may be a viable alternative.

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9 CERTIFICATION

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.r Re: Millstone Nuclear Power Station

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I'hereby certify that in accordance with 40 CFR Section li2.3(d), I have examined the facility named above, that I am familiar with the provisions of 40 CFR Part 112, and that this plan has been prepared in accordance with good engineering practices.

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' ~7 Registered Professional Engineer, State o Connecticut MC- t 0 5 3 7_

Date: 4-449%.

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