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PHILADELPHIA ELECTRI,C COMPANY2301 M ARKET STREET

P.O. BOX 8699

PHILADELPHIA. PA.19101EDW ARD O. B AUER, J R.

vaca enssiosurAgeO SsNuR AL COUNesk

- EUGEN E J. BR ADLEYAssocents essesmas counset

- CONhLD WLANNENM*JDOLPH A. CHILLEMIE. C. MI R K M ALLT. H. M AM E R CO R N ELLPAUL AUERBACH

assistant emmunAL counsuk

] EDWARD J. CULLEN, JR.'

THOM AE H. MILLER JR. June 21, 198313iE N E A. Me t(EN N A

assasvant cownsso

Mr. A. Schwencer, ChiefLicensing Branch No. 2Division of LicensingU. S. Nuclear Regulatory Commission

.

-Washington, D. C. 20555

Subj ect: Limerick Generating Station, Units 1 & 2Power Systems Branch Open Items

- Reference: Telephone conversation with the Power SystemBranch Reviewer, E. Thomlinson and PhiladelphiaElectric Company on June 7,1983

s

Dear Mr. Schwencer:

.The attached documents are revisions' to Se tions 9.5.6.3,.;

9. 5. 7. 2, 9. 5. 8. 3, and Figure 9.5-10 in the FSAR.*

+

The 'nformation contained on these draft FSAR page changesiwill be incoiporated into the FSAR, exactly as it appears on theattachments, in the revision scheduled for July, 1983.

Sincerely,

| /

Euge,

JJH/cmv/B10e306270212 830621PDFt ADOCK 0500035

Attachment A

Copy to: See Attached Service List

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cc Judge Lawrence Brenner (w/o enclosure)Judge Richard F. Cole (w/o enclosure)Judge Peter A. Morris (w/o enclosure)Troy B. Conner, Jr., Esq. (w/o enclosure)Ann P. Hodadon (w/o enclosure)Mr. Frank R. Romano (w/o enclosure)Mr. Robert L. Anthony (w/o enclosure)Mr. Marvin I. Lewis (w/o enclosure)Judith A. Dorsey, Esq. (w/o enclosure)Charles W. Elliott, Esq. (w'/o enclosure)

' Jacqueline I. Ruttenberg (w/o enclosure)- Thomas Y. Au, Esq. (w/o enclosure)

Mr. Thomas Gerusky (w/o enclosure)Director, Pennsylvania Emergency Management Agency (w/o enclosure)Mr. Steven P. Hershey

'

(w/o enclosure)Donald S. Bronstein, Esq. (w/o enclosure)Mr. Joseph H. White, III (w/o enclosure)David Merstn Esq. ' (w/o enclosure)Robert J. Sugarman, Esq. (w/o enclosure),

Martha W. Bush, Esq. (w/o enclosure)Atomic Safety and Licensing Appeal Board'. (w/o enclosure)Atomic Safety and Licensing Board Panel (w/o enclosure)Docket and Service Section (w/o enclosure)

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Each diesel generator unit is protected against the effects of.

natural phenomena such as tornadoes, hurricanes, and floods.Evaluation of the diesel generator starting system with respect'

to the following armas is discussed in , separate FSAR sections asindicated:

a. Protection against wind and tornado effects 3.3*

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b. Flood design 3.4,

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c. Missile protection 3.5

d. Protection against dynamic effectsassociated with the postulated ruptureof piping 3.6

e. Environmental design 3.11- ,

I f. Fire protection 9.5.1

The starting air compressors are tripped during loss of offsitepower; however, adequate compressed air for each diesel is storedin its associated air receivers. Each air start system holds

sufficient air to start the diesel five times under a no-load|condition without compressor assistance. [ g,p .

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- Air consumption and associated air receiver pressure drop arepermitted only by the start and the cranking time control relaysas described in the starting sequence (Section 9.5.6.2). With aninitial pressure in the receiver of 250 psig, tests have proved'

! that one air receiver can sustain up to 14 unsuccessful starts|

and still successfully start the diesel. However, both air

! receivers are used simultaneously. Successful starts are notpossible when the air receiver pressure drops below 80 psig.

Two solenoid air start valve trains are installed on each diesel.Each train supplies air to half of the cylinders. If one valvetrain fails, the other valve train supplies sufficient startingair. In addition, manual air start valves are supplied on bothair-start valve trains. Failure of the compressors is indicats|by an air receiver low pressure alarm and a common trouble alacain the control room. This alarm is initiated by the receiverpressure falling below 200 psig, and is reset when the pressurei

! increases above 215 psi ~g. An operator will investigate thecontrol room alarm and institute corrective action or declare thediesel inoperable. No harmful effects to the diesel. engine willoccur even if no operator action is taken, '

A single active failure in either air starting system would notcompromise the ability of the systems to accomplish their

r] ~ function.'r

9.5-47 Rev. 19, 04/83

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| The filter is sized to ensure ontinuous full-flow operation for

| e minimum of 175 hours, using disposable cellulose cartridges.The filter elements are designed to remove particles down to25-micron size and to absorb water. The filter is provided witha differential pressure indicator and a-pressure switch thatinitiates an alarm on high differential pressure across thefilter. A manual bypass is provided.

The lubricating oil cooler is a shell-and-tube heat exchanger'with a removable tube bundle and floating head design. The tube

; may be cleaned without removing any piping.,

!

! The strainer is a dual element type sized to ensure continuousfull flow operation.

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. All pumps are of the positive displacement type. The engine-' driven pump has sufficient capacity to provide all lubricating

oil rec:uirements under full load operating conditions. The'acmotor-6 riven prelube pump, fed from a Class 1E 480V bus, willlubricate all wearing parts prior to a manual start. Thecirculating pump circulates lube oil from the sump through theelectric immersion heater and back to the sump.

The immersion heater is provided to maintain the lube oiltemperature at a preset value during standby periods. .The lube oil makeup tank is of the vertical construction type andof sufficient capacity to supply lube oil for at least 175 hoursof continuous diesel generator operation.

During diesel generator operations, the lubrication systemoperates automatically, excluding the makeup and storageprovisions. The engine-driven lube oil pump takes suction from ,

the diesel generator sump and delivers the oil through the filterto a three-way thermostatically controlled valve that directs theoil through or around the oil cooler. The oil then flows through

| a full-flow strainer and back to the engine passages.

There are two methods of manual operation of the diesel'

generator, local and' remote. These are normally used forsurveillance exercising. In local manual operation, the operator'

will start the prelube pump, which will operate for 2-1/2 to 3minutes and then automatically shut down. The operator will then-start the diesel generator. In remote manual operation, the!

operator will place the switch in " start". This will start the.

prelube pump, which will operate for 3 minutes before an| interlock permits the diesel generator to start. On emergency

~ diesel generator start, the prelube pump does not operate because,

1t is not required and would delay tie diesel engine start. '-

f na M - d .... . c - M ensure thatIs% M k 6..unb ;1 = in or*= ant to allow an automat 1<-ufficient oil{ f rwn>rmrow. yEcdam unl\ rqan. Asr $L hestA

9.tt a m % i n e A l*$bury 13Reh.yuAron L. reatul au aul <

5-5019, 04/83

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start without damage to the engine internals, and the engine- 'The nower source -driven oil pump will maintain the lubrication. 'I

for the nea'rt: p. ;_pnter in c Class IE bus ,# fee motor-driven ,

circulating pump takes oil from the sump ano directs it throughi

the immersion heater and back to the sump to keep the engine in a'

warm standby mode for quick-start operation. ThJs pumprecirculates 13 gpm of lube oil and is pokered whenever the

A thermostat downsteam of thediesel generator is shut down.I heater controls the oil temperathre between 130 and 1350F by*

| energizing and de-energizing the heater. The power source for -

!

! both the pump Snd the heater is a Class IE 480V bus, fed fromThe switches controlling the lubeeither of two offsite sources.oil heater and the lube oil circulating pump must both be placedin auto or the " SWITCH NOT IN AUTO" alarm on the local controlpnel and the "D.G. TROUBLE" alarm in the main control room will

.

Mth be annunciated.,

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( Lube oil vapors originating in the upper and lower crankcase.

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compartments are drawn out of the engine by the crankcase |This built-in system: evacuation system (Figure 9.5-12).'

maintains a subatmospheric pressure in the crankcase to minimizeIt consists of anleakage of oil through the crankcase gaskets.oil separator and air ejector connected to the crankcase. breather

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The ejector is operated by compressed air from thehousing. The flow ofscavenging system air receiver (Section 9.5.8.2).( air through the ejector draws crankcase vapors through the'

separator; the mixture is then carried to the ejector outlet andTheis discharged into the combustion exhaust cutlet piping.i

lube oil collected by the separator drains back to the crankcase.|

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9.5.7.3 Safety Evaluation

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The diesel generator lubrication system and the crankcaseevacuation system are designed to. seismic Category I requirementsas discussed in Section 3.7. The systems are located within thediesel generator enclosure that is designed to seismic Category Irequirements as discussed in Section 3.8.

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The diesel generator lubrication system is an in'tegral part ofthe diesel generator. The system meets the single failurecritorion in that, if a failure in this system prevents theestisfactory operation of the associated diesel generator, the~

other three diesel generators will provide adequate power tosafely shut down the plant or to mitigate the consequences of the,

postulated accidents.'t-

(,)

9.5-51' Rev. 17, 02/93.

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LIMERN:K GENERATING STATM)NUNITS 1 AND E

FINAL SAFETY ANALYSIS REPORT

DIESEL GENERATOR

STARTING SYSTEP.1i

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h,-t 6 do? o * PWD '. (% cause of the above es cribed c56f @iguration and because the'(

specific gravity of the exhaust gases leaving the enhaust duct isapproximately one-third of the standard air specific gravity, I

exhaust gas contamination of air at the enclosure intake openingwill be nagligible irrespective of outdoor ambient temperature,The exhaust duct extension, beyond thewind speed, or direction.diesel generator enclosure roof, further improves exhaust gas

This extension is considered non-safeguard in thatdispersion.it is not required to meet the system design requirements, and inthat its failure will not interfere with the exhaust duct gas ,

|flow and consequently the performance of'the diesel generator.,

.

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If the cast iron exhaust pipe were broken by tn nado or turbine(

missiles, small pieces of metal might drop in's the exhaust duct,|

but would not reach the turbocharger because of the duct( .

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arrangement and the presence of the exhaust silencer.pieces of metal or the entire cast iron pipe might fall on theenclosure roof but would have no destructive effect because theForroof is designed to withstand tornado and turbine missiles.the low probability event of the cast iron pipe breaking off, thevertical discharge velocity and low specific gravity of theexhaust ensure that recirculation would not be a problem.

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engine silencers are provided with drains for removal ofThe The drains willcondensation that might collect at this point.'

be opened periodically at intervals to be determined by operatingAny dust that might accumulate in the exhaust pipingexperience.will be blown out by the exhaust gases during periodic testing.|

The. engine is not equipped with alarm or shutdown sensors forabnormal conditions in the intake and exhaust systems because theengines are designed to operate under all specified operating-conditions. ,

9.5.8.4 Tests and Inso'ctionse.

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L ~ 'The system is preoperationally tested in accordance with the~~

requirements of Chapter 14 and periodically tested in accordance| Operability of thewith the requirements of Chapter 16.combustion air intake and exhaust system is. checked during the k'.

~ periodic testing of the diesel generator system.

9.5-58Rev. 19, 04/83

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