ML20072C577

Proposed Changes to Tech Spec 4.8.1.1.2.d.11 Re Surveillance for Diesel Generator

ML20072C577
Person / Time
Site:	Sequoyah
Issue date:	06/15/1983
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20072C574	List: ML20072C572 ML20072C577
References
NUDOCS 8306210117
Download: ML20072C577 (4)

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ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 TVA-SQN-TS-44 CHANGE IN THE SURVEILLANCE REQUIREMENT, 4.8.1.1.2.d.11, FOR THE DIESEL GENERA 1tli I

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ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

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

During the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of this test, the diesel generator shall be loaded to greater than or equal to 4400 kw and during i- 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 diesel geherator shall be loaded to greater than or equal to 4000 kw. The generator voltage and frequency shall be 6900 t 690 volts and 60 t 1.2 Hz

! within 10 seconds after the start signal; the steady state generator voltage.and frequency shall be maintained within these .

limits during this test. Within 5 minutes after completing this

. 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test, perform Specification 4.8.1.1.2.d.4.b

9. 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 4000 kw. ,

10. Verifying the diesel generator'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: power source, and c) . Be restored to its. shutdown status.

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11. Verifying that the automatic load sequence timersiare OPERA 8LE i with-the setpoint for each sequence timer within + 5 percent of its design setpoint.

12. Verifying that the following diesel generator lockout featurer:

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prevent diesel generator starting only when required:

l a) Engine overspeed j b) 86 GA lockout relay

e. . At least once per 10 years or after .any modifications which could i

affect diesel generator interdependence by starting the diesel generators simultaneously, during shutdown, and verifying that the diesel generators accelerate to at least 900 rps in-less than or equal to 10 seconds. .

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ELECTRICAL POWER SYSTEMS ,

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.I SURVETLLANCE REQUIREMENTS (Continued 1 .

Within 5 minutes.after completing this 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test, perform Specification 4.8.1.1.2.c.4. The generator voltage and fre-c,uency shall be 6900 1 690 volts and 6011.2 Hz within 10 seconds after the start signal; the steady state generator voltage and frequency'.shall be maintained within these limits during this test.

9. 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 4000 kw. -

10. Verifying the diesel generator'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 of.fsite power source, and c) Be restored to its shutdown status. ,

11. Verifying that the automatic load sequence ~ timers. are OPERABLE 'i with the setpoint for each sequence timer-within 3 5 percent of

. its design setpoint. -

12. Verifying that the following diesel: generator lockout features prevent diesel. generator starting

• only.when required:

a) Engine overspeed ,

b) 86 GA lockout, relay ,

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

affect diesel generator interdependence by starting the diesel

• generators simultaneously, during shutdown, and verifying that the i. -

diesel generators accelerate to at least 900 rpm in less than or equal to 10 seconds. -

f. 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 hypoclorite - "

solution, and

2. Performing a pressure test of those portions of the diesel

. fuel oil system design to Section III, subsection ND of the ASME Code at a test pressure equal tc 110 percent of the system design pressure. -

, . _ _ . . *These requirements are waived for the initial surveillance. . . . . _ _ . . _ . _ __._

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ENCLOSURE 2 JUSTIFICATION FOR PROPOSED TECHNICAL SPECIFICATION CHANGE TVA-SQR-TS-44 SEQUOYAH NUCLEAR PLANT The proposed change deletes the surveillance requirement 4.8.1.1.2.d.11 for the diesel generator in order to reflect the actual as-designed logic which adequately protects the diesel generator from a sustained This changeovercurrent is also condition when in parallel with offsite power.

intended to resolve the discrepancy documented by the NRC-0IE Region II in Inspection Report 50-327/82-36 and 50-328/82-35 dated February 2,1983 The probability of an occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report is not increased by deleting surveillance This instruction requires the diesel instruction 4.8.1.1.2.d.11.

generators (D/G), while in the test mode (parallel to' offsite power), to have the ability to return to standby when a safety injection signal (SIS) is initiated. Sequoyah was not designed to incorporate this function.

Further, Regulatory Guide 1.108, Revision 1, August 1977, Fordoes not require Sequoyah, the D/G to return to standby when an SIS is initiated.

instantaneous overcurrent relays have been installed on the D/G bus to It prevent overload when 'the normal or alternate feeder breaker 10 closed.

is believed that this is sufficient protection from kn' overload condition should there be a simultaneous Load sh,eSIS dding andandblackout se'qV'ential(BO) loading when of thethe diesel is parallel with offsite power. This over-shutdown boards will occur subsequently to the SIS and BO.

current situation is also defined in Chapter 8 of the FSAR (Diesel Generator Operational Testing).

For the above reas'ons, it is also believed that the possibility of an unanalyzed accident or malfunction has not been created, nor'has the mergia of safety in the technical specifications been reduced.

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