ML20042E791

Forwards SER Approving Use of Certain Eagle-21 Sys Channels During Upgrade to Facility Reactor Protection Sys for Mode 5

ML20042E791
Person / Time
Site:	Sequoyah
Issue date:	04/27/1990
From:	Black S Office of Nuclear Reactor Regulation
To:	Kingsley O Tennessee Valley Authority
Shared Package
ML20042E793	List: ML20042E791 ML20042E796
References
TAC-76513 NUDOCS 9005030137
Download: ML20042E791 (5)

Text

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j UNITED STATES NUCLE AR REGULATORY COMMISSION g

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%,.....f Docket No. 50-327 i

Mr. Oliver D. Kingsley, Jr.

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

SUBJECT:

OPERABILITY IN MODE 5 0F.CERTAIN EAGLE-21 SYSTEM CHANNELS (TAC 765 SEQUOYAH NUCLEAR PLANT, UNIT 1 In your letter dated April 24, 1990, you requested that we approve the use of several channels in the Eagle-21 upgrade to the Unit I reactor protection system for Mode 5.

The Eagle-21 System has been installed in the current Unit 1 Cycle 4 refueling outage and is described in your application dated J&nuary 24, 1990 for Technical Specification Change Request 89-27.

You stated that the approval of the use of the system will apply to several " indication only" instrument channels for the following three systems which are required to be operable in Mode 5: the Low-Temperature Overpressure Protection System, the Reactor Vessel Water Level Indication System, and the. refueling water storage tank level indication in the control room.

These channels are the reactor coolant system (RCS) wide range hot leg and cold leg temperatures, RCS wide range pressure, and the refueling water storage tank water level.

These arc channels which have no trip functions or protection actuations performed within the Eagle-21 System.

For these systems to be considered operable, NRC.must approve the use of these channels in the Eagle-21 System, in accordance with 10 CFR 50.59.

Because the entry of Unit 1 into Mode 5 is scheduled for April 26, 1990, you requested that we expedite our review of_ your request.

By letter dated April 26, 1990, you provided documentation that the small amount of verification and validation work remaining to be done on the Eagle-21 i

System does not affect the operation of these channels.

In discussions by l

telephone with your staff on April 25, 1990, your staff stated that all of the i

post-modification testing and Technical Specification operability testing of these channels has been completed.

The only channels in the Eagle-21 System which will be used in Mode 5 are these channels for the three system discussed above.

l Based on our review of your request and the review of the Westinghouse verifi-t cation and validation program for the Eagle-21 System, we conclude that these channels in the Eagle-21 System are acceptable for operation in Mode 5 for the three systems.

The enclosed Safety Evaluation is.the basis for our conclu-sion.

This conclusion only applies to Mode 5 and to only the channels for the.

above three systems, hbN b

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s Mr. Oliver D. Kingsley, Jr. i i

As discussed in the enclosed Safety Evaluation, the control room operators and the instrumentation personnel will be informed which Eagle-21 channels must be i

operable in accordance with the Sequoyah Technical Specifications prior to declaring these channels operable for Mode 5.

You are requested to provide a copy of the summary report for the verification and validat. ion work for the entire Eagle-21 System as soon as practicable after the work is completed.

Sincerely U

SuzanneC.Blac.Assis( int ector for Projects

! TVA Projects Division Office of Nuclear Reactor Regulation

Enclosure:

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Mr. Oliver D. Kingsley, Jr. As discussed in the enclosed Safety Evaluation, the control room operators and the instrumentation personnel will be informed which Eagle-21 channels must be operable in accordance with the Sequoyah Technical Specifications prior to declaring these channels operable for Mode 5.

You are requested to provide a copy of the summary report for the verification and validation work for the entire Eagle-21 System as soon as practicable i

after the work is completed.

i Sincerely, s

uzanne C.

. Assistant Director (TVAProjectsDivision for Projects Office of Nuclear Reactor Regulation

Enclosure:

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Mr. Oliver D. Kingsley, Jr. cc:

Mr. Marvin Runyon, Chairman Mr. Joseph Bynum Acting Site Director Tennessee Valley Authority Sequoyah Nuclear Plant ET 12A 7A Tennessee Valley Authority 400 West Sumit Hill Drive P. O. Box 2000 Knoxville, Tennessee 37902 Soddy Daisy, Tennessee 37379 Mr. C. H. Dean, Jr., Director Mr. Mark J. Burzynski Tennessee Valley Authority Site Licensing Manager ET 12A 11A Sequoyah Nuclear Plant 400 West Sumit Hill Drive P. O. Box 2000 Knoxville, Tennessee 37902 Soddy Daisy. Tennessee 37379 Mr. John B. Waters, Director County Judge Tenr.essee Valley Authority Hamilton County Courthouse ET a'2A 9A Chattanooga, Tennessee 37402 400 West Sumit Hill Drive Knoxville, Tennessee 37902 Regional Administrator, Region II U.S. Nuclear Regulatory Commission Mr. W. F. Willis 101 Marietta Street, N.W.

Chief Operating Officer Atlanta, Georgia 30323 ET 128 16B 400 West Summit Hill Drive Mr. Kenneth M. Jenison Knoxville, Tennessee 37902 Senior Resident Inspector Sequoyah Nuclear Plant General Counsel U.S. Nuclear Regulatory Comission Tennessee Valley Authority 2600 Igou Ferry Road 400 West Sumit Hill Drive Soddy Daisy, Tennessee 37379 ET 11B 33H Knoxville, Tennessee 37902 Mr. Michael H. Mobley, Director Division of Radiological Health Mr. Dwight Nunn T.E.R.R.A. Building, 6th Floor Vice President, Nuclear Engineering 150 9th Avenue North Tennessee Valley Authority Nashville, Tennessee 37219-5404 6N 38A Lookout Place 1101 Market Stw et Dr. Henry Myers. Science Advisor Chattanooga, Tennessee 37402-2801 Comittee on Interior and Insular Afftirs Dr. Mark 0. Medford U.S. House of Representatives Vice President and Nuclear Washington, D.C.

P0515 Technical Director Tennessee Valley Authority Tennessee Valley Authority 6N 38A Lookout Place Rockville Office Chattanooga, Tennessee 37402-2801 11921 Rockville Nke Suite 402 Mr. Edward G. Wallace Rockville, Maryland 20852 Manager, Nuclear Licensing and Regulatory Affairs Tennessee Valley Authority SN 1578 Lookout Place Chattanooga, Tennessee 37402-2801

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