ML20248J764

Grants Util 890402 Request for Discretionary Enforcement for Limiting Condition for Operation 3.8.2.1 to Allow Work on Inverter for Addl 24 H,Per 890401 Telcon W/Nrc

ML20248J764
Person / Time
Site:	Sequoyah
Issue date:	04/07/1989
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
TAC-72866, NUDOCS 8904170042
Download: ML20248J764 (3)

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UNITED STATES NUCLEAR REGULATORY COMMISSION i j, j

WASHINGTON, D. C. 20655

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April 7, 1989 l

L Docket No. 50-327 Mr. Oliver D. Kingsley, Jr.

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

SUBJECT:

DISCRETIONARY ENFORCEMENT FOR LIMITING CONDITI0N FOR OPERATION 3.8.2.1 (TAC 72866) - SEQUOYAH NUCLEAR PLANT, UNIT 1 This letter is our documented response to your request for discretionary enforcement for Unit 1 on April 2,1989.

This request and the basis for the request was documented in your letter of April 4,1989.

At 0243 EST on April 1,1989, a failure of a capacitor occurred in the vital inverter 2-IV which serves the 120-volt alternating current (AC) vital instrument board (Board) 2-IV.

Therefore, the Board was not energized from its inverter as required by Sequoyah Unit 1 Technical Specifications 1

(TS) 3.8.2.1, "0nsite Power Distribution Systems, AC Distribution," for the reactor mode which the unit was in, Made 1.

The Limiting Condition for Operation j

(LC0) 3.8.2.1 was ente'ced at 0243 on April 1, 1989 and, in accordance with the Action Statement b with one inverter inoperable, the Board 2-IV was energized from an alternate feed and actions were begun'to restore the inoperable inverter 2-IV to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or by 0343 EDS on April 2, 1989, before l

the unit must shut down.

The LC0 extended through the start of eastern daylight saving time (EDS) on April 2, 1989.

While efforts continued to repair the inverter, the Tennessee Valley Authority (TVA)concludedthattheinverterwouldnotbereturnedtooperablestatus I

within the-24-hour period.

Therefore, TVA requested discretionary enforcement to allow the work to continue for an additirnal 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or by 0343 EDS on i

April 3, 1989, before the uait must shut down.

This discretionary enforcement j

was granted by me through the senior resident inspector, Mr. K. Jenison, at 0100 EST on April 2, 1989.

The basis for the discretionary enforcement was documented in the TVA letter dated April 4, 1989.

This was discussed with my staff on April 1, 1989 and telecopied to them on April 2, 1989. The Unit I and common loads served by the Board 2-IV are supervisory instrumentation on the 120 volt DC vital battery I

board 2.IV, the emergency gas treatment system room cooler A-A and the control power for the boric acid tank A heater 8-8.

These loads do not affect the safe I

operation of Unit I for this 24-hour period.

Unit 2 is not affected because it was in Mode 5 and these inverters are not required.

The staff concluded that it was safe to allow the work on the inverter to continue for an additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> DFol N h 00$ 05000327 890407 0

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. Mr. ' Oliver D. Kingsley,. Jr.

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April'7, 1989 j

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I while Unit I was operating, instead of having the unit possibly suffer. an unnecessary transient of shutting down on April 2,1989. The work on the' l

inverter was completed and the inverter returned to operable status.at 0228 EDS i

.on April 3,1989, be. fore the additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> had expired.

i Sincerely, Original aigned)t*

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Dennis M. Crutchfield, Associate Director l

for Special Projects Office of Nuclear Reactor Regulation i

cc: See next page Distribution Docket File NRC POR Local PDR Projects Reading ADSP Reading T. Murley/J. Sniezek D. Crutchfield B. D. Liaw S. Black R. Pierson

'L. Watson M. Simms J. Donohew

'0GC B. Grimes E. Jordan ACRS (10)

GPA/CA GPA/PA ARM /LFMB-C. Rossi SQN Rdg. File J. Brady K. Jenison f

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cc:

General Counsel Regional Administrator, Region II Tennessee Valley Authority U.S. Nuclear Regulatory Commission 400 West Summit Hill Drive 101 Marietta Street, N.W.

E11 B33 Atlanta, Georgia 30323 Knoxville, Tennessee.37902 Resident Inspector /Sequoyah NP Mr. R. L. Gridley c/o U.S. Nuclear Regulatory Commission.

Tennessee Valley Authority 2600 Igou Ferry Road SN 1578 Lookout Place Soddy Daisy, Tennessee 37379 Chattanooga, Tennessee 37402-2801 Mr. John T. LaPoint Mr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health Sequoyah Nuclear Plant T.E.R.R.A. Building, 6th Floor P.O. Box 2000 150 9th Avenue North Soddy Daisy, Tennessee 37379 Nashville, Tennessee 37219-5404 Mr. M. Burzynski Dr. Henry Myers, Science Advisor Tennessee Valley Authority Committee on Interior l

Sequoyah Nuclear Plant and Insular Affairs P.O. Box 2000 U.S. House of Representatives Soddy Daisy, Tennessee 37379 Washington, D.C.

20515 Mr. D. L. Williams Tennessee Valley Authority Tennessee Valley Authority Rockville Office 400 West Summit Hill Drive 11921 Rockville Pike W10 885 Suite 402 Knoxville, Tennessee 37902 Rockville, Maryland 20852 County Judge Hamilton County Courthouse Chattanooga, Tennessee 37402 l

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