NUREG-1232, Forwards Safety Evaluation Accepting Improvement Plan for Emergency Diesel Generators Transient Voltage Response.Mods Remain Scheduled by TVA for Completions Prior to Restart of Unit 1,Cycle 4 Refueling Outage

Forwards Safety Evaluation Accepting Improvement Plan for Emergency Diesel Generators Transient Voltage Response.Mods Remain Scheduled by TVA for Completions Prior to Restart of Unit 1,Cycle 4 Refueling Outage

ML20205T154
Person / Time
Site:	Sequoyah
Issue date:	11/07/1988
From:	Black S NRC OFFICE OF SPECIAL PROJECTS
To:	White S TENNESSEE VALLEY AUTHORITY
Shared Package
ML20205T158	List: ML20205T162 NUREG-1232, Forwards Safety Evaluation Accepting Improvement Plan for Emergency Diesel Generators Transient Voltage Response.Mods Remain Scheduled by TVA for Completions Prior to Restart of Unit 1,Cycle 4 Refueling Outage
References
RTR-NUREG-1232 TAC-R00390, TAC-R00391, TAC-R390, TAC-R391, NUDOCS 8811140154
Download: ML20205T154 (3)

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November 7, 1988 Docket Nos. 50-327/328 Mr. S. A. White Senior Vice President, Nuclear Power Tennessee Valley Authority l 6N 38A Lookout Place 1101 Market Street l Chattanooga, Tennessee 37402-2801 Cear Mr. White:

SUBJECT:

DIESEL GENERATOR IMPROVEMENT PLAN - SEQUOYAH NUCLEAR PLANT, UNITS 1 j AND 2 (TACS R00390, R00391)

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By letter dated July 8,1988, the Tennessee Valley Autiiority (TVA) submitted its plan to improve the emergency diesel generators (EDGs) transient voltage response. TVA committed to submit this plan in its letter dated March 3, 1988.

The factors that were to be considered in this plan were discussed in the Sequoyah Nuclear Plant Diesel Generator Evaluation Report (50GER) that was submitted to NRC by letter dated February ?9, 1988.

The staff reviewed the above TVA letters in its review of the EDG loading analysis. This was for the restart of Unit ? in May 1988 from the previous extended outage. The staff concluded in Section 2.3.3.2.1(4) of its Safety Evaluation Report (SER) on the Sequoyah Nuclear Performance Plan, NUREG-1732, Volume 2 dated May 18, 1988, that the EDGs were acceptable for the restart of Unit 2 but noted its reliance on TVA's comitment to improve the EDGs for the plant. TVA submitted the above rian to improve the EDGs transient voltage response to meet this comitment.

The staff's evaluation of the EDGs for tFe restart of Unit 1 from its current extended outace will be included in its SER on Unit 1 which is a supplement (or SSER) to NUREG-1232 Volume 2. The preliminary SSER was issued in the staff's letter dated September 21, 1988. A revision to this SSER including the staff's evaluation of the EDGs for Unit I restart was issued on November 3, 1988 A f0I E t 8811140154 881107 i ADOCK 0500 7

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o Mr. S. A. White November 7, 1%$8 Enclosed is the staff's SER of TVA's improvement plan for the EDGs transient  !

voltage response. The staff concluded that the plan is acceptable and should ,

improve the EDGs transient voltage response. The staff will monitor these l modifications to improve the EDGs. These modifications remain scheduled by TVA for completion prior to the restart of Unit 1 from the Unit 1 Cycle 4 refueling outage. This is acceptable to the staff.

Sincerely.

l Criginal Signed by Suzanne Black, Assistant Director l

for Projects

' Office of Special Projects Enclosure l

Safety Evaluation Report cc w/ enclosure See next page f

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dRC PDR Local PDR Projects Reading ,

OSP Reading l J. Partlow ,

S. Richardson S. Black f i B. D. Liaw i

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0FFICIAL RECORD COPY l

Mr. S. A. White Sequoyah Nuclear Plant 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.

Eli B33 Atlanta, Georgia 30323 Knoxville, Tennessee 37902 Desident 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. LaFoint 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 3'/219-5404 Mr. M. Ray Dr. Henry Myers, Science Advisor Tennessee Valley Authority Committee on Interior -

Sequoyah Nuclear Plant and Insular Affairs P.O. Box 2000 ll.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 ,

Pamilton County Courthouse Chattanooga, Tennessee 37402 ,

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