ML20149F368

Application for Amends to Licenses DPR-77 & DPR-79,re Tech Spec Change 87-47,revising Surveillance Requirement 4.7.7.e.3 to Increase Intake of Fresh Air During Operation of Control Room Emergency Ventilation Sys.Fee Paid

ML20149F368
Person / Time
Site:	Sequoyah
Issue date:	01/11/1988
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20149F372	List: ML20149F368 ML20149F385
References
TAC-R00254, TAC-R00255, TAC-R254, TAC-R255, TVA-SQN-TS-87-4, NUDOCS 8801140218
Download: ML20149F368 (3)

Text

o TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place JAN 111988 TVA-SQN-TS-87-47 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 (SQN) - TECHNICAL SPECIFICATION CHANGE 87-47 In accordance with 10 CFR 50,90, we are enclosing a requested amendment to licenses OPR-77 and DPR-79 to change the technical specifications of Sequoyah Nuclear Plant units i and 2. The proposed change revises surveillance requirement (SR) 4.7.7.e.3 (units 1 and 2) to allow up to 1000 cubic feet / minute (cfm) intake of fresh air during operation of the control room emergency ventilation system (CREVS). It has been determined that it is not practical to restrict fresh air intake to only 200 cfm when meeting the pressurization requirement of SR 4.7.7.e.3. This was determined as a result of extensive testing just recently conducted in attempts to meet the current requirement.

The proposed technical specification change is identified in enclosure 1. The justification for the proposed technical specification change and the supporting dose calculation are provided in enclosure 2. A proposed determination of no significant hazards consideration performed pursuant to 10 CFR 50.92 is provided in enclosure 3.

Because of the potential for impacting the heatup of SQN unit 2, it is requested that this proposed change be processed on an emergency basis. The conditions that necessitate the technical specification change were recently identified during special testing on CREVS. Testing has indicated that increasing the makeup flow to CREVS is the appropriate fix. An alternative to increasing the CREVS makeup flow involves the detection and isolation of leakage paths from the control room habitability zone. Although this option is being pursued in parallel to the enclosed technical. specification change, .

It is estimated that attempts to further reduce leakage paths have a very low  !

probability of success.

L O Y

'8801140218 880111 DR ADOCK 0500 7 An Equal Opportunity Employer

a U.S. Nuclear Regulatory Commission The filtered makeup flow into the control room may be increased to the assumed maximum of 1,000 cfm without exceeding the control room operator dose limits of 5 rem whole body as outilned in 10 CFR Part 50, Appendix A, Criterion 19 General Design Criteria (specifically the dose rate is calculated to be 1.6 rem whole body as 30-days postaccident). Additional details are provided in the enclosures.

If the proposed change cannot be processed as an emergency change, we request that it be given the highest priority and processed as expeditiously as possible. Additionally, should it appear that entry into mode 4 for unit 2 will be delayed because the proposed change has not been approved, we request that a temporary waiver of compliance for surveillance requirement 4.7.1.e.3 be issued. This waiver should be effective from 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> before mode 4 entry until the proposed change is approved.

Enclosed is a check for the $150 amendment application fee required by 10 CFR 170.12.

Please direct questions you may have concerning this issue to Russell R. Thompson at (615) 870-7470.

Very truly yours, TENNESSEE VALLEY AUTHORITY k

M. J. Ray, Defuty Director Nuclear Licensing and Regulatory Affairs Sworn nd subsc d before me this day of . 1988 mm n Expires Enclosures cc: See page 3

U.S. Nuclear Regulatory Commission tJAlN 111988 cc (Enclosures):

Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects Division Office of Special Projects U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Mr. Michael H. Mobley, Director (w/o enclosures)

Division of Radiological Health T.E.R.R.A. Building 150 9th Avenue, N Nashville, Tennessee 37203 Mr. G. G. Zech, Assistant Director for Projects Mail Stop 7E23 TVA Projects Olvision Office of Special Projects U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 l

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