ML20078M844

Safety Evaluation Supporting Amends 195 & 186 to Licenses DPR-77 & DPR-79,respectively

ML20078M844
Person / Time
Site:	Sequoyah
Issue date:	02/09/1995
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20078M841	List: ML20078M839 ML20078M844
References
NUDOCS 9502140417
Download: ML20078M844 (4)

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UNITED STATES j

NUCLEAR REGULATORY COMMISSION f

WASHINGTON, D.C. 30eeH001

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.195 TO FACILITY OPERATING LICENSE NO. DPR-77 AND AMENDMENT NO.186 TO FACILITY OPERATING LICENSE NO. DPR-79 TENNESSEE VALLEY AUTHORITY SE000YAH NUCLEAR PLANT. UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 i

1.0 INTRODUCTION

By application dated December 16, 1994, and supplemented by letter dated January 19, 1995, the Tennessee Valley Authority (the licensee) proposed an amendment to the Technical Specifications (TS) for Sequoyah Nuclear Plant (SQN) Units 1 and 2.

The requested changes would replace the surveillance requirement (SR) to accelerate the diesel to 900 rpm within 10 seconds with a similar requirement to accelerate the diesel generator to 60 1.2 Hz within 10 seconds.

It would also delete the "during shutdown" requirement associated with performance of the diesel generator 10-year interdependence surveillance test.

The supplemental letter supplied amplifying information that did not affect the original no significant hazards consideration determination.

2.0 EVALVATION SR 4.8.1.1.2.a.4 requires that each diesel generator be started at least once 1

per 184 days to verify acceleration to at least 900 rpm in less than or equal to 10 seconds.

In addition, the SR requires verification that the generator voltage and frequency is 6900 690 volts and 60 1.2 Hz within 10 seconds after the start signal. The requested change would delete the requirement to verify that the diesel accelerates to at least 900 rpm. The SR would continue to require that the diesel generator test be conducted at least once per 184 days to verify that the diesel achieves generator voltage and frequency of 6900 1690 volts and 60 i 1.2 Hz in less than or equal to 10 seconds.

SR 4.8.1.1.2.e requires that the diesel generators be started simultaneously during shutdown at least once per 10 years or after any modifications which could affect diesel generator interdependence, to verify that the diesel generators accelerate to at least 900 rpm in less than or equal to 10 seconds.

The requested change would delete the requirement that the surveillance be performed during shutdown.

The new SR 4.8.1.1.2.e would require that the i

diesel generators be started simultaneously at least once per 10 years or 9502140417 950209 PDR ADOCK 05000327 ENCLOSURE P

PDR

after any modifications which could affect diesel generator interdependence to verify that each diesel generator achieves 6900 690 volts and 60 1.2 Hz in less than or equal to 10 seconds.

In justification of their request to remove / replace the 900 rpm requirement in SRs 4.8.1.1.2.a.4 and 4.8.1.1.2.e, the licensee documented by letter dated December 16, 1994, that the removal / replacement does not change the intent of the surveillance.

The 60 1.2 Hz frequency requirement is the same as the 900 rpm speed limit requirement.

The frequency requirement satisfies the speed limit requirement to ensure that the diesel generator is ready to accept accident loads. Therefore, no relaxation of the technical specification requirement is realized by implementing the requested change.

In addition, the requested change is consistent with the Standard Technical Specifications.

In justification of their request to delete "during shutdown" from SR 4.8.1.1.2.e, the licensee documented by letter dated December 16, 1994, that the deletion would not alter the intent of this surveillance.

The deletion is consistent with the Standard Technical Specifications.

With the exception that all diesel generators are started simultaneously, TVA further indicated, in supplemental information provided by letter dated January 19, 1995, and by discussions, that the surveillance (i.e., simultaneous start of all diesel generators during shutdown once per 10 years or after modifications), is the same as the surveillance which requires diesel generator start during normal plant operation every 30 days.

TVA indicated that independence between the diesel generators and the offsite and onsite distribution systems is maintained during the 10-year test. The diesel generators are capable of responding, in accordance with design basis requirements, to a loss of offsite power signal and/or accident signal during the 10-year test.

Failure of one or more diesel generators during the surveillance will not cause a design basis accident or plant condition which would necessitate the use of diesel generators.

Therefore, the deletion of "during shutdown" does not alter the intent of the surveillance.

The staff concludes that the requested changes do not alter the requirements included in SRs 4.8.1.1.2.a.4 and 4.8.1.1.2.e.

The requested changes are, therefore, acceptable.

3.0 STATE CONSULTATION

In accordance with the Commission's regulations, the Tennessee State official was notified of the proposed issuance of the amendment.

The State official had no comments.

4.0 ENVIRONMENTAL CONSIDERATION

The amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR j

Part 20 and changes a surveillance requirement.

The NRC staff has determined that the amendment tavolves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure.

The Commission has previously issued a i

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proposed finding that the amendment involves no significant hazards consideration,-and there has been no public comment on such finding (59 FR 67350). Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).

Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendment.

5.0 CONCLUSION

The Commission has concluded, based on the considerations discussed above, that:

(1) there is reasonable assurance that the health and safety of the.

public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

Principal Contributor: John L. Knox Dated:

February 9, 1995 i

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- Mr. 01'iver D. Kingsley, Jr.

SEQU0YAH NUCLEAR PLANT

' Tennessee Valley Authority.

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Mr. O. J. Zeringue, Sr. Vice President TVA Representative Nuclear Operations Tennessee Valley Authority Tennessee Valley Authority 11921 Rockville Pike 3B Lookout Place Suite 402 1101 Market Street Rockville, MD 20852 Chattanooga, TN 37402-2801 Regional Administrator Dr. Mark O. Medford, Vice President U.S. Nuclear Regulatory Commission Engineering & Technical Services Region II Tennessee Valley Authority 101 Marietta Street, NW., Suite 2900 3B Lookout Place Atlanta, GA 30323 1101 Market Street Chattanooga, TN 37402-2801 Mr. William E. Holland Senior Resident Inspector Mr. D. E. Nunn, Vice President Sequoyah Nuclear Plant New Plant Completion U.S. Nuclear Regulatory Commission Tennessee Valley Authority 2600 Igou Ferry Road 3B Lookout Place Soddy Daisy, TN 37379 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael H. Mobley, Director Division of Radiological Health Site Vice President 3rd Floor, L and C Annex Sequoyah Nuclear Plant.

401 Church Street Tennessee Valley Authority Nashville, TN 37243-1532 P.O. Box 2000 Soddy Daisy, TN 37379 County Judge Hamilton County Courthouse General Counsel Chattanooga, TN 37402 i

Tennessee Valley Authority ET 11H 400 West Summit Hill Drive i

Knoxville, TN 37902 Mr. P. P. Carier, Manager Corporate Licensing Tennessee Valley Authority 4G Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Ralph H. Shell Site Licensing Manager Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 9

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