Text

Tech Spec 3/4.8 for Electrical Power Sys.Safety Evaluation Encl
	ML20011A285
Person / Time
Site:	Farley
Issue date:	09/28/1981
From:	; ALABAMA POWER CO.
To:	;
Shared Package
ML20011A284	List: ML20011A283; ML20011A285;
References
	NUDOCS 8110080448
	Download: ML20011A285 (6)
	v • d • e

.T/4.S ELECTRICAL POWER SYSTEMS

. ATTACHMENT 1 3/4 1.1 A.C. SOURCES 0?ER.:. i1NG 3

AIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. alactrical pcwer sources shall be C?ERASLE:

Two physically independant circuits between the offsite tran'ssissica

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a.-

network to the swit.:hyard and two physically independent circuits frca the switchyard to the ensite Class 15 distri'cutica systac, and,

endent diesel ganarater sets (Set A:

OG l-2A b.

Two separate and indep'2B and DG-20) each with:

and CG-1C, Set B: 'DG 1.

Separate day tanks containing a minicum vclure of SCO g'allens of fuel for the 4075 kw diesel generators and 700.galiens of fuel.for the 2250 kw diesel generator.

2.

A separata fuel transfer pu:p for each diesel.

c.

A fuel storace system consisting of fcur, independent storage tanks each containing a minicum of 25,000 gallens of fuel.*

A?PLICABILI_TY:

MODES 1, 2, 3 and 4.

ACTION:

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a.

With an offsite circuit inoperable, deconstrate tha 0? ERA 3ILITY cf the remaining A.c sources by perforcing Surveillance Requiramants 4

4.8.1.1.1.a. d 4.8.1.1.2.a.4 within one hour and at leest cace per 8***

hours thereafter restore at least two offsite circuits to 0?E.?.ASLE status within 72Mours or be in at legst HOT STA!D5Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in. COL 3 SHUTDOWN within the folicwing 30 h:urs.

b.

With one diesel generator set inoperable, det:nstrate the cparability of the remaining A.C. sources by performing Surveillance Requirecants 4.8.1.1.1.a and 4.8.1.1.2.a.4 within one hour and at least on:e per 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months 's"lhereafter.

Restore

oth diesel generator sets'tc OPERABLE c

rtatus within 721ours or comply with the folicwing:

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B'e in at least HOT STAND 3Y within the next 5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months and in COLD SHUTDOWN within the follcwing 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

"One inoperable fuel storage tank is equivalent to one inoperable diesel generator set.

- Gne time only exception for repair of Diesel 2 C - the 72 hcur actica statement for operability of Diesel 2.C may be extended to a period of 17 days ?revided Diesel 2C is returned to ~0PERABLE status as soon as maintenance is canaleted.

The provisons of specification 3.0.4 are not applicable for :nis ene time change.

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- - 0ne time only exception during repair of Diesel 2b - the S hcur interval test is extended to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

FARLEY-UNIT 2 8110080448 81C928-.3/4 S-1 ament:: INT No. g'Eg7 PDR ADOCK 05000364 P

PDR

ATTIO!.~(Continu:d) 2)

On2 diesel generater set cay be made inoperable for up to 14 days to pe' form scheduled maintenance and testing en diesel generatcrs r

1C (or 2C) provided all the followin'g are satisfied:

i a)

Unit 1 is in P.0DE 5 or 6 cnd apprcpriate technical specifica-

.tions.ccvering the diesel generator sets are satisfied.

I b)

The remaining' Unit 2 diesel generators 1-2A., 28,1C (or-20) are OPERA 3Lc.

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c)

The service water system is recirculated to the pend and s.urveillance requiracant 4.7.6.2.1 is verified pricr to l

removing IC (or 2C) frca service and cnce per S hours thereafter.

I d)

Diesel Generator 1C (or 2C) is returned to OPE?.A5LE status-l as soon as maintenanca is. completed.

l Otherwise, be in at least HOT STAND 3Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in i

j COLD SH;TDOWN within the folicwing 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

1 c.

With one offsite circuit and one diesel generater set of the above required A.C. electrical pcwer sources inoperable, demonstra'a the OPERABILITY of the recaining A.C. sources by perforcing Surveillance Requirements 4.8.1.1'.l.a and 4.8.1.1.2.a.4 within ene hcur and at

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least once per 83. curs thereafter; restore at least ena of the r

inoperable sources to OPERASLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in at.

least HOT STAND 3Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in CGl0 SHUT 00'.-:N I

within the folicwing 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Restore at least two offsite circuits and both diesel generator sets to OPERA 5LE states within 72* hours from the time of initial loss or be in at least HOT STAN05Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDCW.'l within the folicwing 30 j

hours.

n d.

With two of the above requited offsite A.C. circuits ineparable, demonstrate the OPERASILITY of both diesel generator sets by performing Surveillance Requirement 4.8.1.1.2.a.4 within one hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, unless the diesel generators are already operating; restore at least one of the incperable offsite sources to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HOT STAND 3Y within the~ next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

With only one l

offsite source restored, restore both offsite circuits to 0?E?.AELE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial less or 'ce in at least HOT STAND 3Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD..sHUTCO'.,'N within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Acne time only exception for repair of Diesel 2C - the 72 hcur action statetent for operability of Diesel 2C may be extended to a period of 17 days provided Diesel 2C is returned to GPERABLE status as soon as maintenance is comple ed.

ihe provisions of specification 3.0.4 are not apolicable for this one time chanr e

- Cne time only exception during repair of Diesel 2C - the S hcur interval test is extended to 7Z hours.

AME:iDME:iT NO. IX $ 7 FARLEY-URIT 2.

3/4 8-2

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i E1.iCTHC.cl P0i:ER SYSTEME )

.Centinued)

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ACTIO.'::

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e.. With both of the above required diesel generator sets inc;erable, k

dem:nstrata the OPERABILITY of two offsite A..C. circuits.by' performing Surveillance Recuirerent 4.8.1.1.1.a within 1 h:ur and at least once per S hours *thereafter; restore at least one of the inoperable diesel generator sets to OPEPA5LE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months ***

or be in at least HOT STAND 3Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUT 00'.!N within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Restore both diesel

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geilerator sets to GPEP.A3LE status within 7E* hours frc: time cf initial loss or be in least HOT STAND 5Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months '

-and in COLD SHUTDGW within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

St':.VIILLANCE REOUIREPENTS 4.2.1.1.1 Each of the above rehired independent circuits between the ?ffsite transcission network and the ensite Class 1E distributien systa: shall Sc a.

Determined OPE?ABLE at least once per 7 days by verifying correct breaker alignments,' indicated power availability, and n

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b.

Damenstrated OPEPASLE at least once per 18 months during shutdcwn by L

- transferring unit pcuar supply from the normal circuit to the al*:~.ats circuit.

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L 4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE:

a.

In accordance with the frequency specified in Table 4.8-1 on a STAGGERED TEST BASIS by:

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1.

Verifying the fuel level in the day tank,.

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l 2.

Verifying the fuel level in the fuel storage tanks, h-3.'

Verifying.the fuel transfer pump can be started and transfa.2 Tuel frca the stcrage system to the day tank, l

4.

Verifying the diesel starts from ambient condition and accelerates to at least 900 ? pm, for the ES5O kw generator and 514 rpm for the 4075 kw generators, in less than er acual to i

10 seconds.

The generator voltage and frequency shall be 12552 volts and a 57 Hz within 10 seconds af' er the start signal.

5.

Verifying the genorator is synchronized, loaded to greater than or equal to its continuous rating, and operates for greater than or equal 60 minutes,

- One time on 6 exception for repair of Diesel 2C - 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months action staterent for operability of Diesel 2C may be extended to a period of 17 days provided 1'

Diesel 2C is returned to OPERABLE status as soon as maintenance is completed.

The provisions of specification 3.0.4 are not applicable for this one time change.

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. ** - One time-only exception duririg ropair of Diesel 2C - the 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months interval test is extended to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

- - - One time only exception for reoair of Diesel IC durina the current refuelina outage of-Unit 1 - the 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months hction statement for opdrability of tae diesel set which contains Diesel IC may be extended to a period of 8 days

-the return to operable status of Diesel 1C as provided in Sectio (coincident with n 3.8.1.1.b.2) of Unit 2 Technical Specifications.) The provisions of specification 3.0.4 are not applicable for this one time change.

FARLEY-UNIT 2 3/4 8-3 AMENDMENT NO. 7

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ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 6.

Verifying the diesel generator is aligned to provide, standby power to the associated emergency busses.

b.

At least once per 92 days by verifying that a sample of diesel fuel from the fuel storag:. tank obtained in accordance with ASTM-D270-65, is within the acceptable limits specified in Tcble 1 of ASTM D975-74 when checked for viscosity, water and sediment.

At least once per 18 months by:

c.

1.

Subjecting the diesel to an inspection in accordance with procedures prepared in conjurction with its manufacturer's recommendations for this class of t,tandby service, 2.

Verifying the capability to reject a load of greater,than or equal to the largest single load associated.with that; diesel generator, while maintaining voltage between 3120 and 4910 volts and speed less than or equal to 75% of the difference between nominal speed and the overspeed trip setpoint and verifying recovery to 4160 420 volts and 60 1.2 Hz within 2 seconds.

r 3.

Verifying the generator capability to reject a load equal to its continuous rat.ing without tripping.

The generator voltage 4

shall not exceed 120% during and following the load rejection.

4.

Simulating a loss of offsite power by itself, and:

f a)

Verifying de energization of the emergency busses and load shedding from the emergency busses.

l b)

Verifying the diesel starts on the auto-start signal, i

energizes the emergency busses with permanently connected i

loads within 10 seconds, energizes the auto-connected i

shutdown loads through the load sequencer and operates for greater than or equal to 5 minutes while its generator is loaded with the shutdown loads.

After energization of all loads, the steady state voltage and freq;ency of the emer-gency busses shall be maintained at 4160 1 420 volts and 60 1 1.2 Hz during this test.

5.

Verifying that on an Safety Injection test signal (without loss of offsite power) the diesel generator starts on the auto start signal and operates on standby for greater than or equal to 5 minutes.

The generator voltage and freqitency shall be

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> 3952 volts and > 57 Hz within 10 seconds after the auto start signal; the steady state generator voltage and frequency shall

.j be maintained between 4160 420 volts and 60 1.2 Hz during this (

test.

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FARLLV-UNIT 2 3/4 8-4 ji w

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ATTACHMENT II 1

SAFETY EVALUATION FOR CHANGE TO THE A.C. SOURCES - OPERATION

,_ ' TECHNICAL SPECIFICATION

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BACKGROUND On September 27,1981, at 9:05 A.M. while performing surveillance tests on diesel generator 2C, it was determined that jacket cooling water had been introduced into the cylinders. At this time, diesel generator 2C was declared inoperable and the applicable ACTION statement was invoked.-

Investigations reveal that an excess of the time allowed by the ACTION statement will be required to return diesel generator 2C to OPERABLE status.

II.

REFERENCE Technical Specification 3.8.1.1.b for Unit 2.

III. BASES A.

Introduction The onsite emergency ac power supply for Units 1 and 2 consists of l

five diesel generators which supply standby power for 4160V emergency service buses F, G, H, J, K, and L of each unit.

These buses provide power to the emergency loads.

The emergency loads are divided between the emergency buses of each unit in two balanced, redundant load groups so that the failurc of a redundant group does not prevent the safe shutdown of both reactors.

The 4160V emergency buses, F, H and K of each unit and their associated loads are designated as the redundant load group Train A.

The 4160V emergency buses G, J and L of each unit and their associated loads are designated as the redundant load group Train B.

Diesel generators 1-2A and 1C are assigned to the redundant load s

group Train A, while diesel generators 1B, 28 and 2C are assigned to i

the redundant load group Train B.

i Diesel generator 1B is uniquely assigned to Unit 1, while diesel i

generator 28 is uniquely assigned to Unit 2.

Diesel generators 1-2A, i

1C and 2C are shared between the two units.

See FSAR l-Figure 8-3.3.

The capacity of the diesel generators ensures that sufficient power will be available to provide for the functioning of required emergency loads during the worst loading situations.

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With Unit 1 in cold shutdown, diesel generator 1-2A is alige d to Unit 2 and can supply both Unit 2 Train A LOCA and loss of power loads.

Diesel generators 18 and 2B will supply the Train B LOCA and loss of power loads for Units 1 and 2 respectively.

The only cases to be considered, since Unit 1 is in col.d shutdown and.is not scheduled to be returned to power until January 1982, is loss cf

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site power for Units 1 and 2 coincident with a pend dari failure and loss of site power for both units coincident with a LOCA on Unit 2.

For the first case, six river water pumps can be powere'd fro, available diesels and are sufficient to reach and maintain cold shutdown.

For the i

second case, diesels 1-2A and 2B are available to supply the required emergency loads for Unit 2.

In addition, diesel 1B is available to supply the Train B loads for Unit 1.

Unit 1 has been in cold ' shutdown for approximately two weeks; therefore, the required emergency loads are reduced since the decay heat load has been significantly reduced.

4 In addition, Alabama Power Company proposes to d ronstrate the operability of the remaining A.C. sources by performing surveillance requirements of l

Section 4.8.1.1.2.a.4 within one hour and at least once p'er 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months rather than within one hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thefeafter.

Due to expected time required to repair diesel generator 2C, approximately 90 starts on the remaining diesels would be required by Specification 4.8.1.1.2.a.4.

The diesel manufacturer does not recontend the testing

'7 frequency required during the period required to repair; diesel generator 2C due to potential accelerated wear.

In addition, all transmission lines feeding the Farley Nuclear Plant switchyard are currently operable with j

no interruption scheduled during this repair.

Curr;ntly diesel IC is undergoing a maintenance outage as alkwed by Unit 2 Technical Specification Section 3.8.1.1.b.2.

During the time period of thi; Technical Specification,:the frequency of testing of the three remaining diesels will be modified to be performed on a staggered basis. To implement the staggered testing, plant procedures will be modified to ensure that operators art aware of such conditions while diesel 2C is being repaired.

SR0s and Shift i

Technical Advisors will be briefed of such conditions.

Based on a risk assessment performed by the NRC on July 8,1981, the probability of core meltdown du-ing a similar technical specification extension would be approximately 3 x 10-5 Based on the extension period and the improved diesel reliabilit.y, such probability 1

would be significantly lessened.

IV. CONCLUSION The proposed change to Technical Specification 3.8.1.1 does r.at ir.volve i

an unreviewed safety question as defined by 10CFR50.59.

This one time Technical Specification change however will not significantly affect the safe operation of the Farley Nuclear Plant Unit 2.

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ML20011A285

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