NL-13-102, Response to Request for Additional Information Regarding Emergency Diesel Generator Fuel Oil Supplies

Response to Request for Additional Information Regarding Emergency Diesel Generator Fuel Oil Supplies

ML13211A167
Person / Time
Site:	Indian Point
Issue date:	07/23/2013
From:	Ventosa J Entergy Nuclear Northeast
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-13-102, TAC ME9264
Download: ML13211A167 (20)

Text

Enteray Nuclear Northeast Indian Point Energy Center 450 Broadway, GSB

'% Entergy P.O. Box 249 Buchanan, NY 10511-0249 Tel 914 254 6700 John A Ventosa Site Vice President July 23, 2013 NL-13-102 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852

SUBJECT:

Response to Request For Additional Information Regarding Emergency Diesel Generator Fuel Oil Supplies (TAC No. ME9264)

Indian Point Unit Number 3 Docket No. 50-286 License No. DPR-64

REFERENCES:

1. Entergy Letter NL-12-097 to NRC Regarding License Amendment Request for Emergency Diesel Generator Fuel Oil System, dated August 14, 2012 (Accession No. ML12234A250)

2. Entergy Letter NL-13-015 to NRC Regarding Response to Request For Additional Information Regarding Emergency Diesel Generator Fuel Oil System (TAC No. ME9264), dated April 15, 2013

3. NRC Letter to Entergy, Request for Additional Information Regarding Emergency Diesel Generator Fuel Oil Supplies (TAC No. ME9264),

Dated June 27, 2013

Dear Sir or Madam:

Entergy Nuclear Operations, Inc, (Entergy) requested a License Amendment, References 1, to Operating License DPR-64, Docket No. 50-286 for Indian Point Nuclear Generating Unit No. 3 (IP3). This was supplemented in a response to a request for additional information (Reference 2). The proposed changes revise Technical Specification (TS) Limiting Condition for Operation (LCO) 3.8.3, "Diesel Fuel Oil, and Starting Air," to relocate specific numerical values for fuel oil storage volumes from the TSs to the TS Bases in accordance with Technical Specification Task Force (TSTF) 501 Revision 1. On June 27, 2013 the NRC staff identified the need for additional information to complete their review (Reference 3). Entergy is providing additional information in response to this request (see Attachment and Enclosure).

There are no new commitments being made in this submittal.

NL-13-102 Docket No. 50-286 Page 2 of 2 If you have any questions or require additional information, please contact Mr. Robert Walpole, Manager, Licensing at (914) 254-6710.

I declare under penalty of perjury that the foregoing is true and correct. Executed on Julyz-,

2013 Sincerely, JAV/sp

Attachment:

Response to Request For Additional Information Regarding Emergency Diesel Generator Fuel Oil

Enclosure:

Copies of Prior Submittals to the NRC Supporting Response to Request For Additional Information cc: Mr. Douglas Pickett, Senior Project Manager, NRC NRR DORL Mr. William M. Dean, Regional Administrator, NRC Region 1 NRC Resident Inspectors Office Mr. Francis J. Murray, Jr., President and CEO, NYSERDA Ms. Bridget Frymire, New York State Dept. of Public Service

ATTACHMENT TO NL-1 3-102 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING EMERGENCY DIESEL GENERATOR FUEL OIL SYSTEM ENTERGY NUCLEAR OPERATIONS, INC.

INDIAN POINT NUCLEAR GENERATING UNIT NO. 3 DOCKET NO. 50-286

NL-13-102 Docket No. 50-286 Attachment Page 1 of 2 By letter dated August 14, 2012, supplemented in letter dated April 15, 2013, Entergy Nuclear Operations, Inc, (Entergy) submitted a license amendment request for U.S. Nuclear Regulatory Commission (NRC) review that would revise the Technical Specifications (TSs) for Indian Point Unit No. 3 (IP3): The proposed changes revise Technical Specification (TS) Limiting Condition for Operation (LCO) 3.8.3, "Diesel Fuel Oil, and Starting Air," to relocate specific numerical values for fuel oil storage volumes from the TSs to the TS Bases in accordance with Technical Specification Task Force (TSTF) 501 Revision 1. On June 27, 2013 the NRC staff identified the need for additional information to complete their review. The information requested and the response is as follows:

Question 1 RAI-EPTB-7 Chapter 8.2 of the Indian Point 3 Updated Final Safety Analysis Report (UFSAR) provides the following description of the licensing basis for the DG Fuel Oil Storage Tanks:

The IP3 Fuel Oil Storage Tanks provide sufficient fuel for at least 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> of minimum safeguards equipment operation when any two of the DGs and the associated DG Fuel Oil Storage Tanks are available and Technical Specification 3.8.3 requires each to contain 5,365 usable gallons of fuel oil.

Section 9.5.3 of the Nuclear Regulatory Commission's Safety Evaluation Report (SER) for Indian Point 3, dated September 21, 1973, states the following:

With all three transfer pumps powered from essential buses, approximately 93 hours0.00108 days <br />0.0258 hours <br />1.537698e-4 weeks <br />3.53865e-5 months <br /> of diesel fuel is available. In the event of failure of a Single transfer pump, up to 62 hours7.175926e-4 days <br />0.0172 hours <br />1.025132e-4 weeks <br />2.3591e-5 months <br /> operation is available.

Please provide the documentation that approved lowering the number of hours of available emergency diesel generator (EDG) operation stated in the September 21, 1973 SER to the current number of hours of available EDG operation stated in the Indian Point 3 UFSAR.

Response

The NRC issued the SER on September 21, 1973 where they discussed 93 hours0.00108 days <br />0.0258 hours <br />1.537698e-4 weeks <br />3.53865e-5 months <br /> of available diesel fuel. Entergy was unable to find an NRC SER issued prior to the Operating License on December 15, 1975 that specifically approved lowering the number of hours of available fuel oil for emergency diesel generator (EDG) operation. Entergy did identify the following which indicate that a change to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> of available fuel oil was submitted to the NRC for review and approval prior to the Operating License:

1. Question 8.8, answered in Supplement 3 dated April 1972, and associated FSAR pages are enclosed. They provide some discussion of the underground fuel oil tanks but do not mention the 93 hours0.00108 days <br />0.0258 hours <br />1.537698e-4 weeks <br />3.53865e-5 months <br />.

2. The response to Question 8.8 was revised in Supplement 30, May 1975 and Supplement 31, October 1975. The associated FSAR pages (revised up to Supplement 30) discussed the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> of operation with minimum safeguards. Both are enclosed.

NL-13-102 Docket No. 50-286 Attachment Page 2 of 2

3. The Appendix A to the Operating License, issued April 5, 1976, discussed the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> with minimum safeguards in the Bases. Selected pages are enclosed.

The 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> value currently in the FSAR was discussed in an NRC SER as part of Technical Specification Amendment 153 (NRC letter to Indian Point, Issuance of Amendment For Indian Point Nuclear Generating Unit No. 3 (TAC NO. M90054)" dated October 7, 1994).

ENCLOSURE TO NL-13-102 COPIES OF PRIOR SUBMITTALS TO THE NRC SUPPORTING RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION Prior Submittals Question 8.8, Supplement 3, and Associated FSAR Pages Question 8.8, Supplement 31 FSAR Pages through Supplement 30 Appendix A Pages from 4-5-76 License ENTERGY NUCLEAR OPERATIONS, INC.

INDIAN POINT NUCLEAR GENERATING UNIT NO. 3 DOCKET NO. 50-286

Justify your 80 urs, as opposed to sven-day, msise 44esj fmnt sapply.

The three Individual storage tanks are specified In the Technical Specificatious to have a uiniaw inventory of 19,000 uas of diesel fuel. This is suf ficient for at least 80 hbuas ulam safegards equipment.

In addition, the Technical Specifications require 22,000 gallow to fuel a ullis storage available in other normal supply sanks; this is suffletent for an additional 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> of sminimm safeguards equipmentc. Tee supplies vlLi assure operation of two diesels at the tinlma load for emineed safe-Sgards equipment for more than seven days. Also, cmmerial oil supplies ss trucking facilities exist to assure deliveries within a day's notice.

See Revised FSAI Pages 8.2-13 =- 13s, Supplaent 3.

A .nmspstd condition causes Istpet genentor output and tinrerfors, the diesel geuerator shobld be shut dwn for corrective action to be take to. restore the g*erator outpuc to norml.

The units will use diesel oil spec Hr. 2. A 175 gallon "day" tank is located at each of the units. Three 7700 gallon, undergro~, fuel oil.

storage tanks, each fitted with a transfer pim, lee switch assembly and dial level indicator, are provided on site. Each transfer po is srranged to discharge to either a normal or in y header eai each header indepfe dently supplies the "day" tanks at each ensine. The leveI switch stops tin adjacent transfer pump wen storage tank level fails to within 12 inches of the tank bottom. Normally, two ranks would be com;letely filled rand te third filled to witibn tm feet of full. This third tank would be the sevie tank and its pumps selected to run. As level in the service tank falls; to 34 inches from full (5676 gtllons innase), an alarm sigal is sounded in the central control ro and administrative action must be take to refil the tank. Thus, normally to tanks are filled (at 7700 galou oinuge) and the service tank has at least 5676 gallons or a total of 21,076 gallons of which 3 1.314 is nominaLly unavailable and 20,762 gallons are available. Two dissel esgir.es at recircuation phase load would operate for 89 hours0.00103 days <br />0.0247 hours <br />1.471561e-4 weeks <br />3.38645e-5 months <br />. In the un-likely event thit one of the filled tanks is wgavwtlble, 12,500 gasos I available which is sufficiaet to operate two egines at recirculation pinss load in excess of the required 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> (duration 54 hours6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br />). Transfer of oil from each underground storage tank to each unit "day" trnk is accomplished autotically, Any tank mounted oil transfer pump is capable of servifg nly one or more "day" tanks through manual vanvihh.

MAdittonal fuel oil suitable for use In the diesel generators Wil be stored on site. The minisim storage of 22,000 gallons of additional fuel oil wi assure operation of two diesel for 90 additional hours at the minima lmd for engineered safeguaids. Mditional supplies of diesel oil are available locally. Under nornl conditions, 25,000 palons can be delivered on a one or two day notice. Additional supplies are also maintained in Sthe Ngw Rochelle - Mount Vernon area (about 40 miles from the plant) and are available for use during oegenciels, subject to extrems cad weather conditions (increased dcnmetic heating usage) and available transportation.

s.z-n3 Supplement 3

Esaka Ti a-sd -wr- n mnloaed I a eny Pet tlaftnd s-ty a Wil~diag ~Iwataal Sin usaL to a WMO tdiag In

.qiLO smtatm am aznagp -s tV"-V cow. pnafLl to smbashesr with qapistul b-bis iF'-a4irnta. ann will be pwduti s ltMall War* to sa=e do ths tdf danesk I t md doltr also*iLad cablilm, canardl paJ.stdadtclsu tu ask et fo fri* wotmetla. lfdvihld (S deantle 8,2-LU!4 6.2-13. 3

a" eameeic pm ctiftee opteotme ast pmtdwd 0i each am a"m ftul oil d&a tag. lns dbnetua smte such mmhiee is the gmo Comm,1 ton Is 094"d to amm £o to ot51 to qucky setnece dt decOtta and Spiay devies. to adtcie, amma fire tllbttm eitp t Is Itated in etac permoesel acesw mot.

tcc ceAtrol pwet esalme role" ad nteimt equi for the diafel-G se pnWeOmn n. .the evemn of -n mlwics fire he evest is iecmmiated In the iu casuel r m . Vith the e*purmelL ud diesel-are.6 amnrsuton seprsvsa desigs.of pi . e faem ra unit ad Lts aClated .qdpwm to the akewr miw itoS*SISd.

Lack diesel femrato' be its -m a Ll tuel nn' (fy) tmk tbma teod the fuel oil Pro A the s*lmae. A11 day tAOs m ntiaml tll rtues 1%

• SariV ine operatds fto three mpes* e mfbvgread etags tans ouasmid the diewel pnrnn tlIdu. Each uemqe t ha its oft appy ip minted it a em0te opeMi in the tp of toe tank Ae oil leml. It Is tberefore ulike!y hat a tire amlacsud with Oy me of die unit I() oil. n e (day) M&asts mid poinmt .1t has bdq Oml11 te tde to1 raialJ. Ctm diesel*.

t* ntc Is to be started em the camrse of either of the ftllang imcidents:

1. luitiation of safety injection o@pntioem.

2. Udi*eriqe on msy of the 40 volet huses.

or occurrmce of agid eu yeh w the agem no at Idl me am be cad to ieaergised boos by tdo pemuoir fur the count roem If desired.

QUESTION 8.8 Justify your 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />, as opposed to seven-day, onsite diesel fuel supply.

ANSWER The three individual storage tanks are specified in the Technical Specifica-tions to have a minimum inventory of 5,676 gallons of diesel fuel in each tank. Assuming only two of the underground storage tanks are available and 5,238 gallons usable per tank, this is sufficient fuel for at least 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> 30 of minimum safeguards equipment.

In addition, the Technical Specifications require 26,300 gallons of fuel as minimum storage available for Unit No.3 usage in other normal supply tanks on site or at the Buchanan Substation. This is sufficient to assure con-tinuous operation of two diesels at the minimum engineered safeguards load for a total of seven days. Also, additional supplies of diesel fuel oil are available locally. 131 Supplement 31 Q8.8-1 Supplement 3 Supplement 30 October, 1975 April, 1972 May, 1975

An ov*rsr-ced conditLi:i CaXes a-nmproper gconeratot output and thercforc, the diel! gvnerator !thozl* be ',hdii down for ronective action to be takcn to restore the generator output to normal.

Fuel oil for the dicq*l generator-; Is stored In three 7700 gallon under-ground storage tank:. located on the south flIde of the Diesel-Generator Building. Th,-e is one common truck hose eons.ction and a 4-inch fill line for all three tanks, complete with a four-Inchl shutoff valvP at each tank.

The overt low from any tank will carcade into an adjacent tank. Each tank iL equipl._.'. , a .i..J. VLtaIL.1 fuL1 cii 1.i'fcr ptwp that dlscha, gcs to either a normal or emergency header. Each header independently supplies the day tank at each diesel. An alarm w1ll sound in the control room when the level in any underground storage tank drops approximately 34 inctns 3,19 from the top of the tank (5676 gallons innage). Administrative action will be taken to refill the taik. In add!tion, there is a low-ltvel pump cut-out switch located on each tank to prevent damage to the fuel oil transfer pump. Each tank is also equipped with a sounding connection and a level indicator. Decrease in level in a day tank to approximately 115 gallons (65% full) vill cause the transfer pump in the corresponding underground storage tank to start. Once started, the pump will continue to run until the day tank is filled. When the tank is filled, a level switch will initiate closing of the day tank inlet valve and discontinue operation of tie fuel oil transfer pump.

Each, diesel is equipped with a 175-gallon day tank, which is sufficient for approximately the first 75 minutes of post-accident operation (30 minutes injection and 45 minutes recirculation) with the tank 652 full.

Fuel flows by gravity to the engine, insuring a static head of fuel oil on the injection wanlfolds. Excess fuel oil is collected in a drip tank located in the base of the diesel engine. A manually operated drain pump is provided so that the drip tank can be emptied back into the day tank.

The diesel fuel oil storage and transfer system diagram is slhown in 10 Figure 8.2-1.

8.2-13 Supplement 3 Supplemetit 19 April, 1972 June, 1973 Supplviitct 10 Janluary, 1973

0 30 9 /,prol-imately 37,000 gallons of fuel oil is required to operate two di,*.vls at rinimum safeguards load conttnuously for 1.68 hours7.87037e-4 days <br />0.0189 hours <br />1.124339e-4 weeks <br />2.5874e-5 months <br />. Approxi-mately 10,100 gallons (lO,4-0 in storar~c tanks and 25.0 in day tanks) is available assuming in the unlikely event that one underground sLorage tark is unavailable. Based on No. 2 diesel fu(I oil with a minimum 30 93 dt'asity of 6.87 lbls/gallon and an averare consumption rate of 0.382 19 lbs/*p-Hr, this capacity is sufficient to operate two diesels at minimum satt'zunrds for at least 48 hours. An additional minimum on-site stor.*a* n! 26,300 1!cn-,l', r:.czsary  : --. :: . ccnt'nuous- opcration of Lto diesels at minimum safebuards load for a total of 168 hours0.00194 days <br />0.0467 hours <br />2.777778e-4 weeks <br />6.3924e-5 months <br />. This reserve is in addition to the storage requirements for other plants at the site. Approximately 28,000 gallons of fuel oil is necessary to operate two diesels for seven days to maintain the unit in a cooldown condition concurrent with a loss of off--site power.

There are two 30,000 gallon Class IIl tanks located In the Indian Point Unit No. 1 Superheater Building and a 200,000 gallon Clasi Ill tank in the Rucharan Substation Jocated Jr.-nediately across Broadway. *These tanks contiain fuel oil for operation of gas turbines that Is compatible for use with the diesels. Each tank has a level Indicator and a capacity check is raade daily. When the gas turbines .re being operated, the dispatcher 19 will be notifivd to start oil deliveries and to keep the tanks filled.

The gai turbines consume approximatelv 2000 gallons oer turbine per hour.

3 I Atruck vith hose connections comparable with the underground stoisge tanks Iwill be provided. If the diesels require the reserves in these tanks, the contents of these tanks would be transported by truck to the undergrcound diesel storage tanks Additional supplies of diesel oil are available locally. Under normal conditions, 25,000 gallons can be delivcied oan a one or two-day notice.

Additional s,.pplies are also maintained In the New Rochelle-Mount Vernon area (about 40 miles from the plint) and are available for use during trercenctts. subject to extreme cold weather conditions (increased domestic hbating usage) and available transportation.

S Supplement 19 Supplement 3 Supplement 30 June. 1973 April, 1972 8.2-13(a) Mlay, 1975

APPENDIX. A TO FACILITY OPERATING LICENSE DPR-64 TECHNICAL SPECIFICATION AND BASES FOR THE INDIAN POIWN NUCLEAR CENERATN' UNIT NO. 3 WESTCHESTER COUNTY, NEW YORK POWER AUTHORITY CONSOLIDATED EDISON OF THE STATE COMPANY OF OF NEW YORK NE YORJ NC INc.

DOCKET NO. 50-286 Date of Issuance: APR 5 1975 81t-09 700

I 3.' aazm na usaSzn as.=

Applies to the availability of electrical pousr for the operation or plant auxiliarie-.

To define those conditions of electrical paoer availability necessary (l)

.o provide for safe reactor operation, and (2) to provide for the continuing availability of engineered safety features.

A. The reactor shall not be brought above the cold shutdOWn condition unless the following requiremnts are met:

1. Two physically independent transmission circuits to Ruchanan Substation capable of supplying engineered safeguards loads.

2. 6.9 XV buses 5 and 6 energised from either 138 KV feeder 95331 or 95332.

3. Either 13.8 XV feeder 1392 or 13W93 and its associated 13.8/6.9 KV transforimer available to supply 6.9 KV power.

A. The four 480-volt buses 2A, 3A. 5A and 6A energized and the bus tie breakers between buses SA and ZA. and berween buses 3A and 6A, opened.

5. Three diesel generators operable with a aLinimum onBite supply of 5676 gallons of fuel available in each of the three individual underground storage tanks and 26,300 gallons or fuel compatible for operation with the diesels available onsite other than the underground storage tanks or at the Buchanan substation. This 26,300 gallon reserve is for Indian Point Unit No. 3 usage only

a sad it It addition en the fuel requiirmanth fIt OTr amfl e units o" the sate.

6. Three be, eriees plus three chargers and the D. C. itstrfbutiim system operable.

7. o muore than eat 120 volt A. C. Instrtment Bus In the b6.k4*

lighting supply.

I. The requiresent of 3.7.A say be modified to alUl My oft of t0.

folloving power supplies to be Iueperable at smy oad tOe:

I. One diesel or my diesel fuel oil syste or a diesel and Its associated fuel oil syeten may be Inoperable for up to 7 days provided the 130 IK sad the 13.6 IV sources of offelte poir arm available mad the remainlq diesel geuerators are tested daily to enaure operability and the oiniseered safety features associated with these diesel gmnerator buses are operable.

2. The 138 KV or the 13.8 KV sources of powee ay be inoperable for AS hours provided the three diesel generstors are operable. This operat.*on say he extended beyond 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> provided the failure is reported to the SRC within the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> period with an outliue of the plans for restoration of offsite power.nd NRC appoval is granted.

3. One battery may be Inoperable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided the other batceries and the three battery charSers remain operable with one battery charger carrying the D. C. load of the failed battery supply system.

C. If the electrical distribution system is not restored to Sect the requirements of 3.7.A within the time periods specified in 3.7.B, then-:

1. If the reactor is critical, it shall be brought to the hot shutdomn condition utilihing narmal operating procedures. The shutdo4w shall start no later than at the end of the specified time period.

3-7-2

2, tf the reactor in subcritical, the reactor coolant system tmperature and pressure shall not be increased more than 25'? and 10O psi, reepectively, over existing values.

3. In either case, it the requirements of 3.7.A ate nu satis-fled within an additional 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, the reactor shaul hi brought to the cold shutdown condition utilizing normal operating procedures. The shutdown shall start no later than the end of the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> period.

D. The requirements of Specification 3.7.A.1 may be modified during an emergency system-wide blackout condition as follows*

Two of the three 13.8 KV feeders (13W92, 131493 and/or 13W94) to the Buehann Substation 138 KV buses operable with a, least 31 MW power from any combination of ea" turbines (nameplate rating at 80"F) at the Buchanan Substation and onsite available for exclusive use on Indian Point Unit No. 3.

E. Whenever the reactor critical, the circuit breaker on the electri-cal feeder to emergency lighting panel 318 inside contalaunt shall be locked open except when containment access is required.

Basis The electrical system equipment is arranuged so that no single contingency can Inactivate enough safeguards equipment to Jeopardize the plant safety.

The 480-volt equipment Is arrar;ged on 4 buses. The 6900-volt equipment is supplied from 6 buses.

The Buchanan Substation has both 345 KV and 138 KV transmission circuits which are capable of supplying startup, normwl operation, shurdown and/or engineered safeguards loads.

The 138 KV supplies or the gas turbines are capable of providing suitficient power for plant startup. Power via the .tatlon auxillarv transformur can supply all the required plant auxiliaries during normal operation. it required.

In addition to the unit transformer, four separate sohtrres supplv station I servire power to the plant.

3.7-3

10a0 The plant auxiliary equipment is arranged electtically so that aM 4ple4 items receive their power from different buses. Redundant valves are individually supplied from separate mntor control centers.

The bus arrangalonta specified for operation ensute that power is available to an adequate sawber of mafeuarda auxiliaries. With additional wVitching, more equipment could be out of service without infringing on safety.

Two diesel gmnerstors have sufficient capacity to start and run within design load the minimu required engineered safeguards equipment. (1)

The ¶intsum onsite underground stared diesel fuel oil inventory is maintained at all times to assure the operattin of two dials carryits the mlnimma required engineered safepards equipment load for at least 48 tours. (2)

Additional fuel oil suitable for use in the diesel generar4 will be stored either on site or at the Buchanan Substation. The mlnimm storage of 26,300 gallons of additional fuel oil will saure continuous operation of two diesIs at the minimum engineered safeguards load for a total of 7 days. A truck with hosing connections coa.astible with the underground diaeel fuel aill storage tanks is available for transferal of diesel oil from storap areas either on site or at the Buchanan Substation. Cmoarcial oil supplies &Ad trucking facilities are also available.

Periodic diesel outages will be necessary to perform the corrective maintenance required as a result of previous tests or operations and the preventive ftaintenance recoaseuded by the manufacturer.

One battery charger shall be in service an each battery so that the batteries will always be at full charge in anticipation of a loss-of-AC poser incident.

This insures that adequate D.C. power will be available for starting the emergency generators and other emergency uses.

The plant can be safely shutdown without the use of offuite power since all vital loads (safety system, instruments. etc.) can be supplied from the emergeni*y diesel generators. a 3.7-4

F Any two of hire 4ti eerertme 2

, the station aniliary transffa the separate 13.8 to 6.9 KV trmansformer are each capable of supplying the r or minims safeguards loads, and therefore provide separate sorces of power Immediately available for p~tration of these loads. Thus the power supply system meets the single failure criteria required of mafaty system. To provide malto assumence that the redundant or alternate paver supplies will operate if requi-ad to do so, the redundant or alternate power supplies are verified operable prior to initiating repair of the inoperable power supply.

If it develops that (a) the inoperable power supply is ret repaired within the specified allowable time period, or (b) a second paver supply in the sae or related category it found to be inoperable, the reactor, if critical, will initially be brought to the hot shutdown condition utilising normal operating proceditros to provide for reduction of the decay heat wrom the fuels and consequent reduction of cooling requirements after a postulated loss-of-coolant accident. rf the reactor was already ubecritical, the reactor coolest systems temperature and pressure will be saintainad within the stated values in order to limit the amount of stored energy in the Reactor Coolant System.

The stated tolerances provide a band for operator control. After a limited time in hot shutdown, if the malfunction(s) are not corrected. the reactor sill be brought to the cola shutdown condition, utilizies normal shutdown mad cool-dovrL procedures. In the cold shutdown condition .there is no possibility of an accident that would release fission products or damuse the fuel elentra.

Conditions of a system-wide blackout could result in a unit trip. Since normel off-site paver supplies as required in Specification 3.1.A.1 are not available for startup, it is necessary to be ablt to black start the unit with gas turbines providing the incoming power supplies as a first step in restoring the system to an operable status and restoring power to customers for essential services. Specification 3.7.C provides for startup using 37 W's of gas turbine power (nameplate rating at 8097) w'hich is sufficient to carry out a normal plant startup, A systea-wide blackout is deemed to exist whun the majority of Con Edison electric generating facilities are shutdown due to an electrical disturbance and the reinuder are incapable of supplying the system therefore necessItating maijor load shedding.

i .

[ 3.7-5

the re-is stripped as safety injection, Staes the backup lilghIng Supply Me not more n am -orin "it A. C. etacmant bus be ertsiged 4uirnent to wedre Miiami ofarlba cauatimnt0 fro the backu litsbf supply Is spray etuation channela.

that Sigt becom As i teul of aS ian igAtila of the effect coapoamts and have an ICCS. conasinmet isolation mubamrgd following a LOCA ml breaker a fume and a locked ope circuit other safety-relned fztioam, pmel 316 feeder to emergency lighting twere provided an the electritcal can-circult breaker It the open position, inAide conctainmat. With Cho 1-70 is de-oeargiaed duing the accident taimmant electrical pentration powe containmet my be required during comdition. Personel acies" to during improbable that a LOCA woulad ocecu operation. Since it is hijily that durifo circult breaker my be elosed this ahout period of time, the Inside ntulamti for personnel safety.

tim to provide emergency lighting

1) nal - Section 8.2.1 a

2) FS - Section 9,2.3 I

3.7-6