ML19319C102

Safety Evaluation Supporting Change to Tech Specs

ML19319C102
Person / Time
Site:	Davis Besse
Issue date:	07/29/1977
From:	TOLEDO EDISON CO.
To:
Shared Package
ML19319C099	List: ML19319C098 ML19319C101 ML19319C102
References
NUDOCS 8001310466
Download: ML19319C102 (5)

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SAFETY EVALUATION FOR REQUESTED CHANGE TO THE DAVIS-BESSE NUCLEAR POWER STATION UNIT 1 TECHNICAL SPECIFICATIONS (APPENDIX A TO OPERATING LICENSE NO. NPF-3) .

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Technical Specification 3.8.1.lb2 and 4.S.1.1.2b should be revised as shown on the attached revised pages 3/4 8-1 and 3/4 8-3 of the Davis-Besse Unit 1 Technical Specifications to reflect the installation of the redundant emergency diesel generator fuel storage tanks.

These new tanks have been added to provide a separ, ate tornado missile protected seven day fuel oil supply to each emergency diesel generator.

The design of these emergency genera:or fuel oil tanks was deceribed in Section 9.5.4 of the FSAR in Revision 17 in March, 1976. The installa-tion of these fuel oil storage tanks is a condition on Operating License No. NPF-3.

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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 follcwing A.C. electrical power sources shall be OPERABLE: .

a Two independent circuits between the offsite transmission work and the onsite Class lE distribution system, each cisting of; 3 OPERABLE 345 KV transmission line,

2. One OPERABLE 345-13.8 KV startup transformer, and .

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3. One OPERABLE 13.8 KV bus, and

b. Two separate and independent diesel generators each with:

1. A separate day fuel tank containing a minimum volume of 4000 gallons of fuel,

- 2. A separate fuel storage system containing a minimum volume of 32,000 gallons of fuel, and

3. A separate fuel transfer pump.

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APPLICABILITY: MODES 1, 2, 3 and 4.

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ACTION:

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a. With either an offsite circuit or diesel generator of the above required A.C. electrical power sources inoperable, demonstra.a the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirements 4.8.1.1.1.a and 4.8.1.1.2.a.4 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; restore at least two offsite circuits and two diesel generators to CPERABLE 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 in COLD SHUTCOWN within the f.-11owing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />,

b. With one offsite circuit and one diesel generator of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirements 4.8.1.1.1.a and 4.8.1.1.2.a.4 within DAVIS-BESSE, UNIT 1 3/4 8-1 ,, ,.

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ELECTRICAL POWER SYSTEMS

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ACTION (Centinued) p 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; restore at

least 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 STANC8Y 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 />. Restore at least two offsite circuits and two diesel generators to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> frem the time of initial loss

or be in at least H07 STANDSY 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

CCLD SHUTCCWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

c. With two of the above reouf red offsite A.C. circuits inoperable, demonstrate the CDERASILITV cf two diesel generators by perfonning Surveillance Requirement 4.8.1.1.2.a.4 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, unless the diesel generators are already cperating; restore at least one of the ir.o:eracle of# site sources to OPERABLE status within 24

, hours or be in at least HOT STANDBY w thin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

, With only one offsite source restored, restore at least two-offsite' circuits to OPERASLE status within 72 hcurs frca time

, of initial loss or be in at least HOT STANDSY within the rext ,

6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTCOWN within tie folicwing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. . )

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d. With two of the above reouired diesel generators inoperable, demonstrate the CPERASILITY of two offsite A.C. circuits by performing _ Surveillance Reoui. scent 4.8.1.1.1.a within one hour and at least once ser 5 hcues thereafter; restore at least one

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of the inoperaole diesel gererators to OPERABLE status within 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 FCT STAND 3Y 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 SHUTDCNN within the foliowing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore at least t.io diesel generators to OPERABLE status within 72

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hours from time of initial icss or ce 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 SHUTDCWN within the

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following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE RETJIRE"ENTS-4.8.1.1.1 Each of the above reouired independent circuits between the offsite transmission network anc the onsite Class lE distribution system

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a.- Determined OPERABLE at least once per 7 days by verifying correct breaker alignments and indicated power availablity.,

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b. Demonstrated GPERABLE at least once per 18 months during  :

I shutdown by transferring (manually and automatically) unit ,

power supply to each of the 345 KV transmission lines. '

DAVIS-BESSE, UNIT'l 3/4 8-2

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ELECTRICAL POWER SYSTEMS

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SURVEILLANCE REQUIREMENTS (Continued'

4. 8.1.1. 2 Each diesel generator shall be demonstrated OPERABLE:

a. At least once per 31 days on a STAGGERED TEST BASIS by:

1. Verifying the fuel level in the day fuel tank,

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2. Verifying the fuel level in the fuel storage tank,

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

4. Verifying the diesel starts frem ambient condition and accelerates to at least 900 rpm in 1 10 seconds,

5. Ver'.fying the generator is synchronized, leaded to > 1000 kw, and operates for > 60 minutes, and

6. Verifying the diesel generator is aligned to provide standby power to the associated essential busses.

7. Verifying that the automatic load sequence timer is OPERABLE with each load sequence time within + 10% of

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its required value.

b. At least once per 92 days by verifying that a sa=ple of diesel fuel from each of the two fuel storage tanks is within the accept-able limits specified in Table 1 of ASTM D975-68 when check.ad for viscosity, water and sediment.

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c. At least once per 18 months during shutdown by:

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

2. Verifying the generator capability to reject a load of 1 480 kw without tripping,

3. Simulating a loss of offsite power in conjunction with a safety injection actuation test signal, and:

a) Verifying de-energization of the essential busses and load shedding from the essent1al busses, DAVIS-BESSE, UNIT 1 3/4 8-3 I

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ELECTRICAL POWER SYSTEMS SURVEILLANCE REGUIREME!1TS (Continued) b) Verifying the diesel starts from ambient condition on the auto-start signal, energizes the essential busses with permanently connected loads, energizes the auto-connected essential loads through the load sequencer and operates for 3,5 minutes whil.e its generator is loaded with the essential.loacs.

c) Verifying that all diesel generator trips, except engine overspeed and generator differential, are automatically bypasseo upon loss of voltage on tne essential bus and/or an SFAS test signal.

4 Verifying tne diesel generater operates for '> 60 mirutes

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while loadec to 3,2000 kw.

5. Verifying that the auto-connected loads to each diesel generator do not exceed the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of 2838 kw. ,,

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DAVIS-BESSE, UNIT 1 3/4 8-4

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