ML20078Q468

Application for Amends to Licenses DPR-77 & DPR-79, Consisting of TS Change 94-16,revising Requirements for Monthly D/G Start Surveillance 4.8.1.1.2.a.4 & 10-yr Interdependence Surveillance 4.8.1.1.2.e

ML20078Q468
Person / Time
Site:	Sequoyah
Issue date:	12/16/1994
From:	Shell R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20078Q470	List: ML20078Q468 ML20078Q483
References
NUDOCS 9412220207
Download: ML20078Q468 (3)

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7(rnr+%Ctf Valtey Aisthcoty Post Off.ca Box XKl0 Soddy Daisy. Tennessee 37379 December 16,1994 TVA SON-TS-9416 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SON) - TECHNICAL SPECIFICATION (TS)

CHANGE 94-16," DELETION OF 900 REVOLUTIONS PER MINUTE (RPM)

REQUIREMENT FOR THE DIESEL GENERATOR (D/G) SURVEILLANCES" in accordance with 10 CFR 50.90, we are enclosing an amendment to Licenses DPR-77 and DPR-79 to change the TSs of SON Units 1 and 2. The proposed change revises the requirements for the monthly D/G start Surveillance 4.8.1.1.2.a.4 and the 10-year interdependence Surveillance 4.8.1.1.2.e. The requirement to accelerate to at least 900 rpm has been deleted from both surveillances. Word changes have also been incorporated to relate voltage and frequency to the acceptance criteria for D/G starts. The requirement to perform the 10-year surveillance during shutdown has been removed.

The proposed TS change is identified in Enclosure 1. The justification for the proposed TS change is provided in Enclosure 2. A proposed determination of no significant safety hazards consideration performed pursuant to 10 CFR 50.92 is provided in Enclosure 3.

TVA requests expedited processing of the proposed changes to minimize the potential for not meeting the D/G start surveillance requirements to reach at least 900 rpm within 10 seconds. Failure to meet the existing requirements could result in a valid D/G start f ailure and may invoke accelerated testing unnecessarily. TVA strives to keep D/G starts as low as possible and accclerated testing for an inappropriate reason would be contrary to industry and NRC recommendations for D/Gs. Approval of the proposed change will eliminate D/G failures because of the overly restrictive 900 rpm requirement.

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l U.S. Nuclear Regulatory Commission Page 2 December 16,1994 TVA did not anticipate not exceeding 900 rpm on D/G starts, or the proposed TS changes, until after the first D/G was modified and tested with the improved D/G '

speed controller. Modification and testing was completed on D/G 2A-A in July 1994, and the evaluation of options to resolve the compliance concern with the 900 rpm requirement was completed in September 1994. On September 28,1994, D/G 2A A failed the 10-second ambient start test because D/G speed accelerated to and stabilized at 899 rpm, but did not reach 900 rpm. The speed controller setpoint was increased slightly and the test was rerun successfully to return the D/G to operable status. TVA will revise this valid failure of D/G 2A-A, and any other failures of this nature that may occur, to a successful valid test upon approval of the proposed TS change. This action will prevent inappropriate accelerated testing of the D/Gs. The next performances of the affected tests are scheduled for January 1995.

TVA requests a 45-day implementation period for this TS chango following issuance.

Please direct questions concerning this issue to Keith Weller at (615) 843-7527.

Sincerely, l Y l R. H. Shell l Manager SON Site Licensing Swor and subppribedpefore me is day of L t#Att/Ill'D 1994 JFO/ $ >

IJot$rf'Public My Commission Expires Enclosures cc: See page 3

U.'S. Nuclear Regulatory Commission Page 3 December 16,1994 (Enclosures):

Mr. D. E. LaBarge, Project Manager l Nuclear Regulatory Commission l One White Flint, North j 11555 Rockville Pike Rockville, Maryland 20852 2739 Mr. Michael H. Mobley, Director (w/o Enclosures) l Division of Radiological Health  !

3rd Floor L & C Annex 401 Church Street Nashville, Tennessee 37243-1532 NRC Resident inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 L ..