ML20247Q574

Amend 77 to License NPF-12,revising Tech Specs to Reduce Severity Starts of Emergency Diesel Generators

ML20247Q574
Person / Time
Site:	Summer
Issue date:	05/30/1989
From:	Adensam E Office of Nuclear Reactor Regulation
To:
Shared Package
ML20247Q578	List: ML20247Q574 ML20247Q584
References
NUDOCS 8906060469
Download: ML20247Q574 (14)

Text

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UNITED STATES

[g NUCLEAR REGULATORY COMMISSION g

WASHINGTON, D. C. 20555

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l SOUTH CAROLINA ELECTRIC & GAS COMPANY SOUTH CAROLINA PUBLIC SERVICE AUTHORITY DOCKET NO. 50-395 VIRGIL C. SUMMER NUCLEAR STATION, UNIT NO. 1 AMENDMENT TO FACILITY OPERATING LICENSE' Amendment No. 77 License No. NPF-12 1.

The Nuclear Regulatory Commission (the Commission) has found that:

A.

The application for amendment by South Carolina Electric & Gas Company (the licensee), dated June 10, 1985, as supplemented December 6, 1985 and May 16. July 14, July 28 and November 18, 1988, and April 5,1989, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regulations set forth in 10 CFR Chapter I; B.

The facility will operate in conformity with the application s the provisions of the Act, and the rules and regulations of the Commission; C.

There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Comission's regulations; D.

The issuance of this amendment will not be inimical to the comon defense and security or to the health and safety of the public; and E.

The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.

4

?.

Accordingly, the license is emended by changes to the Technical Specifications, as indicated in the attachment to tilis hcense amendirent; and paragraph 2.C.(2) of Facility Operating License Wo. NPF-1E is hereby amended to read as follows:

8906060469 890530 ADDCK0500g?55 DR

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2 (2)- Technical-Specifications and Environmental Protection Plan The Technical Specifications contained in Appendix A,.as revised through Amendment-No. 77

, and the Environmental Protection Plan.

contained in Appendix'B, are hereby incorporated in the. license.

South Carolina Electric & Gas Company shall operate the facility-in accordance with the Technical Specifications and the Environmental Protection Plan.

3.

This amendment is effective as of its date of issuance, and'.shall be implemented within 30 days of issuance.

Ie FOR THE NUCLEAR REGULATORY COMMISSION Original. Signed By:

Elinor G. Adensam, Director Project Directorate II Division of Reactor Projects I/II Office of Nuclear Reactor Regulation

Attachment:

Changes to the Technical Specifications

-Date of Issuance:

May 30, 1989 1

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ATTACHMENT TO LICENSE AMENDMENT NO. 77 TO FACILITY OPERATING LICENSE NO. NPF-12 DOCKET NO. 50-395 Replace the following pages of the Appendix "A" Technical Specifications with the enclosed pages. The revised pages are identified by amendment number and contain vertical lines indicating the areas of change. Corresponding overleaf pages are also provided to maintain document completeness.

Remove Pages Insert Pages 3/4 8-1 3/4 8-1 3/4 8-2 3/4 8-2 3/4 8-2a 3/4 8-2a 3/4 8-3 3/4 8-3 3/4 8-4 3/4 8-4 3/4 8-5 3/4 8-5 3/4 8-6 3/4 8-6 3/4 8-6a 3/4 8-6a 3/4 8-7 3/4 8-7 3/4 8-8 3/4 8-8 B 3/4 8-1 B 3/4 8-1 B 3/4 8-2 B 3/4 8-2 (overleaf)

+ 3/4.8-ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES

~

. OPERATING LIMITING CONDITION FOR OPERATION

~3.8.1.1 As a' minimum, the following A.C. electrical power sources shall be

'0PERABLE:

Two' physically independent circuits.between the offsite transmission a.

netwerk and the onsite Class 1E distribution system, and b.

Two separate and independent Emergency Diesel Generators (EDG), each with:

1.

A separate day fue.1 tank containing a minimum volume of 300 gallons of fuel, 2.

A separate fuel storage system containing a minimum volume of 42,500 gallons of fuel, and 3.

A~ separate fuel transfer. pump.

APPLICABILITY:

MODES 1, 2, 3 and 4.

ACTION:

With one offsite circuit of 3.8.1.1.a inoperable:

a.

1.

Demonstrate the OPERABILITY of the remaining offsite A.C.

sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and 2.

If either EDG has not been successfully tested within the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, demonstrate its OPERABILITY by performing Surveillance Requirement 4.8.1.1.2.a.3 separately for each such EDG within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> unless the diesel is already operating, and i

3.

Restore the offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b.

With on EDG of 3.8.1.1.b inoperable:

1.

Demonstrate the OPERABILITY of the A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.2..a within I hour ar.d at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and 2.

If the EDG becan:e inoper&ble due to any cause other thar preplanned preventive maintenance or testing, demonstrate the OPERABILITY of the remaining EDG by performing Surveillance Requirements 4.8.1.1.2.a.3 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *, and 1

• This test is required to be completed regirdless of when the inoperable EDG is restored to OPERABILITY.

SUMMER - UNIT 1 3/4 8-1 AMENDMEliT NO. 77 i

s s.

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION' ACTION: (Continued) 3.

Within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, verify.that required systems, subsystems, trains components and devices that depend on the remaining EDG 2, or 3, that the Turbine Driven Emergency Feed Pu OPERABLE.

If these conditions are not satisfied within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

4.

Restore the EDG to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD S within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

With one offsite circuit and one.EDG inoperable:

c.

1.

. Demonstrate the~0PERABILITY of the remaining offsite A.C.

source by performing Surveillance Requirement 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and 2.

If the EDG became inoperable due to any cause other than preplanned preventive maintenance or testing, demonstrate the OPERABILITY of the remaining EDG by performing Surveillance Requirement 4.8.1.1.2.a.3 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> *, and 3.

Within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, verify that required systems, subsystems, trains, components and devices that depend on the remaining EDG 2, or 3, that the Turbine Driven Emergency Feed Pump OPERABLE.

If these conditions are not satisfied within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COL SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

4.

Restore one of the inoperable sources to OPERABLE status within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, and 5.

Restore the other A.C. power source (offsite circuit or diesel generator) to OPERABLE status in accordance with the provisions of Section 3.8.1.1 Action Statement

. or b., as appropriate, with the time requirement of that Auion Statement based on the time of initial loss of the remaining inoperable A. C. power source.

• This test is required to be completed regardless of when the inoperable EDG is restored to OPERABILITY i

SUM 4ER - UNIT 1 3/4 8-2 AMENDMENT NO. 77

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (Continued)

ACTION: (Continued) d.

With two of the required offsite A. C. circuits inoperable:

1.

performing Surveillance Requirement 4.8.1.1.2 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, unless the EDG's are already operating, and 2.

Restore one of the inoperable offsite sources to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

3.

Following restoration of one offsite source, follow Action based on the time of initial loss of the remainin offsite A.C. circuit.

With two of the above required EDG's inoperable:

e.

1.

Demonstrate the OPERABILITY of two offsite A.C. circuits by performing S "eillance Requirement 4.8.1.1.1.a within one hour and at least

'ce per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and 2.

2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least H0T STANDBY within and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

3.

Following restoration of one EDG, follow Action Statement b.

with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable diesel generator.

SURVEILLANCE REQUIREMENTS 4.8.1.1.1 the offsite transmission network and the onsite Class I i

l shall be:

breaker alignment and indication of power availabilit a.

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SUMMEP. - UNIT 1 3/4 8-2a AMENOMEtil NO. 77

ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) b.

Demonstrated OPERABLE at least once every 18 months by manually transferring the onsite Class 1E power supply from the normal circuit to the alternate circuit.

4.8.1.1.2 Each EDG shall be demonstrated OPERABLE:

In accordance with the frequency specified in Table 4.8-1 on a a.

STAGGERED TEST BASIS by:

1.

Verifying the fuel level in the day tank and fuel storage tank.

2.

Verifying the fuel transfer pump can be started and transfers fuel from the storage system to the day tank.

3.

Verifying the diesel generator can start

• and accelerate to synchronous speed (504 rpm) with generator voltage and frequency at 7200 720 volts and 60 1.2 Hz.

4.

Verifying the generator is synchronized, gradually loaded

• to an indicated 4150-4250 kW** and operates for at least 60 minutes.

l b.

At least once per 31 days and after each operation of the diesel where the period of operation was greater than or equal to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> by removing accumulated water from the day tank.

By obtaining a sample of fuel oil in accordance with ASTM-D270-1975 c.

at least once per 92 days and prior to the addition of new fuel oil to the storage tanks and verifying that the sample meets the following minimum requirements and is tested within the specified time limits:

1.

As soon as sample is taken (or prior to adding new fuel to the storage tank) verify in accordance with the tests specified in ASTM-D975-77 that the sample has:

a)

A water and sediment content of less than or equal to 0.05 volume percent.

b)

A kinematic viscosity @ 40 C of greater than or equal to 1.9 centistokes, but less than or equal to 4.1 centistokes.

c)

A specific gravity as specified by the manufacturer @

60/60 F of greater than or equal to 0.83 but less than or I

equal to 0.89 or an API gravity @ 60 F of greater than or equal to 27 degrees but less than or equal to 39 degrees.

• This test shall be conducted in accordance with the manufacturer's recommenda-I l

tions regarding engine prelu~e and warmup procedurer, and as applicable regard-D ing loading reconnendations.

t

• • This band is n.eant as guidance to avoid routine overloading of the engine.

Loads in excess of this band shall not invalidate the test.

SUMMER - UNIT 1 3/4 8-3 AMENDMENT NO. 77 l

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ELECTRICAL, POWER SYSTEMS 7

SURVEILLANCE ~ REQUIREMENTS-(Continued) 2.

Within 1 week after obtaining the sample, verify an impurity

-level of-less than 2 mg of insolubles per 100 ml when tested in accordance with ASTM-D2274-70.

3.

Within 2 weeks of obtaining the sample, verify that the other

-properties specified in Table 1 of ASTM-0975-77 and Regulatory-Guide 1.137 Position 2.a are met when tested in accordance with ASTM-0975-77.

L d.

At least once per 184 days by:

1.

Starting and accelerating the EDG to synchronous speed (504' rpm) with generator voltage and frequency at 7200 720 volts and 60 1 1.2 Hz within 10 seconds after the start signal. The EDG shall be started for this test by using one of the following signals:

a)

Simulated loss of offsite power by itself.

b)

Simulated loss of.offsite power in conjunction with an ESF actuation test signal.

c)

An ESF actuation test signal by itself.

d)

Simulated degraded offsite power by itself.

e)

Minual.

2.

The 9.nerator shall be manually synchronized, loaded to an indicated 4150-4250 kW** in less than or equal to 60 seconds, and operate for at least 60 minutes.

At least once every 18 months by:

e.

[

1.

Subjecting the diesel to an inspection in accordance with procedures prepared in conjunction with its manufacturer's recommendations for this class of standby service, 2.

Verifying that on rejection of a load of greater than or equal to 729, the voltage and frequency are maintained at 7200 1 720 volts and frequency at 60 1 1.2 Hz.

3.

Verifying the generator capability to reject a load of 4250 kw without tripping.

The generator voltage shall not exceed 7920 volts during and following the load rejection.

4.

Simulating a loss of offsite pcwer by itself, and:

L a)

Verifying de-energization of the emergency busses and load shedding from the emei*gency busses.

i i

• • This band is meant as guidance to avuid routine ove-loading of the engine.

1:

t Leads in excess of this band shall not invalidate the test.

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j SUMMER - UNIT 1 3/4 8-4 AMENDt1ENT NO. 77 e

l

' ELECTRICAL POWER SYSTEMS I

J SURVEILLANCE REQUIREMENTS (Continued) b)

Verifying the diesel starts on'the auto start signal, energizes the emergency busses with permanently connected loads.within 10 seconds, energizes the auto-connected shutdown loads through the load sequencer and operates for i

greater than or equal'to 5 minutes'while its generator is

.j loaded with the shutdown loads. After'energization of these loads, the steady-state voltage and frequency shall be maintained at 7200 1 720 volts and 60 1.2 Hz 5.

Verifying that on an ESF actuation 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 frequency shall.be 7200 1 720 volts and 60 t 1.2 Hz within 10 seconds. after the auto-start signal; the steady-state generator voltage and frequency shall be maintained within these limits during this test.

Af ter 5 minutes of standby operation verify that on a simulated loss of offsite power:

a)

~the loads are shed from the emergency busses, b) the diesel generator does not connect to the bus for at i

least 5 seconds, and c) that subsequent loading of the diesel generator is in accordance with design requirements.

6.

Simulating a loss of offsite power in conjunction with an ESF actuation test signal, and a)

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

b)

Verifying the EDG starts in the emergency mode, energizes l

the emergency busses with permanently connected loads within 10 seconds, energizes the auto-connected emergency (accident) loads through the load sequencer and operates for greater than or equal to 5 minutes and maintains the steady state voltage and frequency at 7200 1 720 volts and 60 1.2 Hz c)

Verifying that all EDG trips, except engine overspeed, generator differential and low lube oil pressure are automatically bypassed upon loss of voltage on the emergency bus concurrent with a safety injaction actuation signal.

i r

SUMMER - UNIT 1 3/4 8-5 AMENDMENT N0. 77

y.,

ELECTRICAL POWER' SYSTEMS

$ SURVEILLANCE REQUIREMENTS (Continued) 7.

Verifying the EDG operates for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

a) -

The EDG-shall be loaded to the continuous rating.

(4150-4250 kw**) for the-time required to reach' engine temperature equilibrium, at which time the EDG shall be' loaded to an indicated target value of 4676 kw (between 4600-4700 kw**) and maintained for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

b) _

During the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> of this test, the EDG.shall be loaded to an indicated.4150-4250 kw**.

c)~

During this test the steady state voltage and frequency shall be maintained at 7200 1 720 volts and 60 1 1.2 Hz.

d)

Within 5 minutes after completing this 24-hour test, perform Surveillance Requirement 4.8.1.1.2.e.4.b.

8.

Verifying that the auto-connected loads to~each EDG do not exceed the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of 4548 kw.

9.

Verifying the EDG's capability to:

a)

Synchronize with the offsite power source while the generator is loaded with its emergency loads upon a simulated restoration of offsite power,

'b)

Transfer its loads to the offsite pc e m ;e.,

.S c)

Be restored to its standby status.

10.

Verifying that.with the diesel generator operating in a test mode, connected to its bus, a simulated safety injection signal overrides the test mode by (1) returning the diesel generator to standby operation and (2) automatically energizes the emergency loads with offsite power.

11.

Verifying that the fuel transfer pump transfers fuel from each fuel storage tank to the day tank of each diesel via the installed cross connection lines.

12.

Verifying that the automatic load sequence timer is OPERABLE with the interval between each load block within i 10% of its design interval.

13.

Verifying that the following diesel generator lockout features prevent diesel generator starting only when required:

a.

Barring Device i

b.

Raote-Local-Maintenance Switch

• • This band is meant as guidance to avoid routice overicading of the Engire Loads in excess of this band shali not invalidate the test.

4

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4 SUMMER - UNIT 1 f

3/4.8-6 AMENDMENT NO. 77

ELICTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS-(Continued) f.

At least once per 10 years or after any modifications which' could

. affect diesel generator interdependence by starting the diesel diesel generators accelerate to at least'504' rpm in.le equal to 10 seconds.

g.

At least once per 10 years by:

1.

Draining each fuel oil storage tank, removing the accumulated sediment and cleaning the tank using a sodium hypochlorite solution or its equivalent, and 2.

Performing a pressure test of those portions of the diesel fuel oil system designed to Section III subsection ND of the ASME' Code at a test pr design pressure. essure equal to 110 percent of the system

- 4. 8.1.1. 3 be reported to.the Commission in a Special Report pursua 6.9.2 within 30 days.

Reports of diesel generator failures shall include the.

information. recommended in Regulatory Position C.3.b of Regulatory Guide Revision 1, August'1977.

-(on a per diesel generator basis) is greater than or equal to 7 shall be supplemented to include the additional information recommended in Regulatory Position C 3.b of Regulatory Guide 1.108, Revision '1, August 1977.

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'l SUMMER - UNIT 1 3/4 8-6a AMENDMENT NO. 77 i

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7.. :.g Q:

v' TABLE 4.8-1.

' DIESEL GENERATOR TEST SCHEDULE

' Number of Failures in Number of Failures Last 20 Valid Tests

• in.Last 100 Valid Tests

• Test Frequency

<1 54 Once per 31 days 12**

15 Once per 7'ays d

• Criteria for determining number of failures and number of valid tests shall but determined on a per diesel generator basis.be.in accordance w For the purposes of determining the required test frequency, the previous test failure count may be reduced to zero if, in conjunction with the manu-

.facturer a complete diesel overhaul to like-new conditions is completed, and if acceptable reliability has been demonstrated.

The reliability crite-rion shall be the successful completion of 14 consecutive tests in a single series.

Ten of these tests shall be in accordance with Surveillance Require-ment 4.8.1.1.2.a.3 and 4.8.1.1.2.a.4; four tests, in accordance with Surveillance Requirement 4.8.1.1.2.d.

If this criterion is not satisfied during the-first series of tests, any alternate criterion to be used to transvalue the failure count to zero requires NRC approval.

• • The associated test frequency shall be maintained until seven consecutive failure free demands have been performed _and the number of failures in the last 20 valid demands has been reduced to one.

SUMMER - UNIT 1 3/4 8-7 AMENDMENT N0 77

.w

,7 ELECTRICAL POWER SYSTEMS LA.C. SOURCES m

SHUTDOWN 1

LIMITING CONDITION FOR OPERATION 3.8.1.2 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

One circuit'between the offsite transmission network and a.

Class IE distribution. system, and b.

One diesel generator

• with:

.l_

1.

A day fuel tank containing a minimum volume of 300 gallons of

fuel, t

2.

A fuel storage system containing a minimum volume of 30,000 gallons of fuel, and 3.

A-fuel transfer pump.

APPLICABILITY: MODES.5 and 6.

ACTION:

.With 'less than the above minimum required A changes, movement of irradiated fuel, or crane operation with loads over the fuel storage pool.

In addition, when in MODE 5 with the Reactor Coolant loops not filled, or in MODE 6 with the water level less than 23 feet above the required sources to OPERABLE status as soon as possible. re SURVEILLANCE REQUIREMENTS

4. 8.1. 2 The above required A.C. electrical power sources shall be demonstrated OPERABLE by the performance of each cf the Surveillance Requirements 4.8.1.1.2 (with the exception of 4.8.1.1.2.a.4) and 4 8 1 1 3 l

• ESFloaisIquencermaybedeenergizedinModes5and6providedthatthelo of voltage and degraced voltage relays are disabled.

l SUMMER ~ UNIT 1

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3/4 8-8 AMENDMENT NO. 77 1

+.

3/4.8' ELECTRICAL POWER SYSTEMS BASES l

1 3/4.B.1, 3/4.8.2 AND 3/4.8.3

'A.C.

SOURCES, D.C. SOURCES AND ONSITE POWER DISTRIBUTION SYSTEMS The OPERABILITY of the A.C. and D.C power sources and associated distribution systems during operation ensures that sufficient power will be available to supply the safety related ecuipment required for.1) the safe i

shutdown of the facility and 2) the mitigation and control of accident condi-tions within the facility.

The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix "A" to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation.

The OPERABILITY of the power sources are consistent with the initial condition assumptions of the safety analyses and are based upon maintaining at least' one redundant set of onsite A.C. and D.C.

power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure.

of.the other onsite A.C. source.

The A.C. and D.C. source allowable out-of-service times are based on Regulatory Guide 1.93, " Availability of Electrical Power Sources," December 1974.

When one diesel generator is inoperable, there is an. additional ACTION requirement to verify that all required systems, subsystems, trains, components and devices, that depend on the remaining OPERABLE diesel generator as a source of emergency power, are also OPERABLE, and that the steam-driven auxiliary feedwater pump is OPERABLE.

This require-ment is intended to provide assurance that a loss of offsite power event will not result in a complete loss of safety function of critical systems during the period one of the diesel generators is inoperable.

The term verify as j

used in this context means to administratively check by examining logs or other information to determine if certain components are out of-service for maintenance or other reasons.

It does not mean to perform the surveillance requirements needed to demonstrate the OPERABILITY of the component.

The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that L

1) the facility can be maintained in the shutdown or refueling condition for extended time periods and 2) sufficient instrumentation and control capability l

is available for monitoring and maintaining the unit status.

The Surveillance Requirements for demonstrating the OPERABILITY of the l

diesel generators are in accordance with the reconnendations of Regulatory Guides 1.9, "Selectier of Diesel Gererator Set Capacity fcr Standby Power Supplies," March 10, 1971, 1.108, " Periodic Testing of Diesel Generator Units used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977, and 1.137, " Fuel-0il Systems for Standby Diesel Generators,"

Revision 1, October 1979, as modified by the NRC's review and approval of South Carolina Electric & Gas Company's Juae 10, 1986 and December 6, 1985 ama dment requests.

SUMMER - UNIT 1 8 3/4 8-1

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