ML20033G648

Forwards Safety Evaluation Re Response Time Testing of Solid State Protection Sys Input & Master Relays.To Maintain Consistency W/Previous Staff Decisions,Response Time Testing Relays May Not Be Eliminated from Tech Specs

ML20033G648
Person / Time
Site:	Sequoyah
Issue date:	04/03/1990
From:	Black S Office of Nuclear Reactor Regulation
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
Shared Package
ML20033G649	List: ML20033G648 ML20033G650
References
TAC-75339, TAC-75340, NUDOCS 9004100461
Download: ML20033G648 (3)

Text

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April 3,1990 1

Docket Nos. 50-327 and 50-328 J

Mr. Oliver D. Kingsley, Jr.

I Senior Vice President, Nuclear Power Tennessee Valley Authority 6N 38A Lookout Flace 1101 Market Street Chattanooga, Tennessee 37402-2801 1

SUBJECT:

RESPONSE TIME TESTING 0F SOLID-STATE PROTECTION SYSTEM INPUT AND MASTER RELAYS (TAC 75339/75340)- SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 I

By letter dated November 28, 1989, you explained that, during the Cycle 4 refueling outages for Units 1 and 2 in this year, there will be an upgrade to l

the reactor protection system (RPS) at Sequoyah.

The upgrade is the replacement of the Foxboro H-Line analog hardware currently in use with the-Westinghouse Electric Corporation Eagle-21 digital system.

You stated that the Eagle-21 system has built-in automated test features for calibration and response time surveillance testing. These self-test features test the Eagle-21 system including its reactor trip and engineered safety feature functions.

However, the input and master relays of the solid state protection system (SSPS) are not response time tested as part of the Eagle-21 self-tests.

In lieu of developing procedures and test methods to response time test the SSPS input and master relays with the Eagle-21 RPS configuration, you requested that the RPS channel functional testing in the Sequoyah Technical Specifications be considered a sufficient verification of these relays' ability to perform their safety function.

You stated that the additional information gained from the response time testing of the SSPS input and master relays does not warrant the resource expenditures necessary to develop the new methodology and procedures to test the relays in the Eagle-21 RPS configuration.

The technical justification for eliminating the requirements to response time test the relays was provided as an enclosure to your letter.

You requestect a formal response to this issue by December 29, 1989, to facilitate the preparation of technical specification changes and testing procedures for the Unit 1 Cycle 4 refueling outage.

We have reviewed your request and have had discussions on this request with your staff.

Based on the enclosed Safety Evaluation, we conclude that, to maintain consistency with previous staff decisions and because the variations in response times of the SSPS input and master relays tested at Sequoyah are large, the response time testing of these relays may not be eliminated from the Sequoyah Technical Specifications.

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Mr. Oliver D. Kingsley, Jr..

This was discussed with your staff in early January 1990.

The technical specification changes to support the installation of the Eagle-21 system at Sequoyah Units 1 and 2 in the Cycle 4 refueling outages were submitted in your letter dated January 24, 1990, with response time testing required for l

the SSPS input and naster relays.

The staff's evaluation of these technical specification changes will be the subject of a future letter.

Sincerely, f

Original signed by Suzanne Black, Assistant Director I

for Projects l

TVA Projects Division Office of Nuclear Reactor Regulation

Enclosure:

I Safety Evaluation cc w/ enclosure:

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RESPONSE TIME TESTING

Mr. Oliver D. Kingsley, Jr. CC:

General Counsel Mr. Kenneth M. Jenison Tennessee Valley Authority Senior Resident Inspector 400 West Summit Hill Drive Sequoyah Nuclear Plant ET 110 33H U.S. Nuclear Regulatory Comission Knoxville, Tennessee 37902 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 Mr. F. L. Moreadith Vice President, Nuclear Engineering Mr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health 400 West Sumit Hill Drive T.E.R.R.A. Building, 6th Floor WT 12A 12A 150 9th Avenue North Knoxville, Tennessee 37902 Nashville, Tennessee 37219-5404 Dr. Mark O. Medford Dr. Henry Myers, Science Advisor Vice President and Nuclear Comittee on Interior Technical Director and Insular Affa1rs Tennessee Valley Authority U.S. House of Representatives 6N 38A Lookout Place Washington, D.C.

20515 Chettanooga, Tennessee 37402-2801 Tennessee Valley Authority Mr. Edward G. Wallace Rockville Office Manager, Nuclear Licensing 11921 Rockville Pike and Regulatory Affairs Suite 402 Tennessee Valley Authority Rockville, Maryland 20852 SN 157B Lookout Place Chattanooga, Tennessee 37402-2801 Mr. Joseph Bynum Acting Site Director Sequoyah Nuclear Plant Tennessee Valley Authority l

P. O. Box 2000 l

Soady Daisy, Tennessee 37379 Mr. Mark J. Burzynski Site Licensing Manager Sequoyah Nuclear Plant P. O. Box 2000 Soddy Daisy, Tennessee 37379 County Judge Hamilton County Courthouse Chattanoog6, Tennessee 37402 Regional Administrator, Region 11 U.S. Nuclear Regulatory Comission 101 Marietta Street, N.W.

l Atlanta, Georgia 30323 i