View source for 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

{{Adams
| number = ML20205T154
| issue date = 11/07/1988
| title = 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
| author name = Black S
| author affiliation = NRC OFFICE OF SPECIAL PROJECTS
| addressee name = White S
| addressee affiliation = TENNESSEE VALLEY AUTHORITY
| docket = 05000327, 05000328
| license number = 
| contact person = 
| case reference number = RTR-NUREG-1232
| document report number = TAC-R00390, TAC-R00391, TAC-R390, TAC-R391, NUDOCS 8811140154
| package number = ML20205T158
| document type = CORRESPONDENCE-LETTERS, NRC TO UTILITY, OUTGOING CORRESPONDENCE
| page count = 3
}}

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     , , [#ga*'g, tag,\             NUCLEAR REGULATORY COMMISSION UNITED STATES g          ;e                                       WASHINGTON, D. C. 20556
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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)
\
By {{letter dated|date=July 8, 1988|text=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|date=March 3, 1988|text=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|date=September 21, 1988|text=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
I              DISTRIBUTION
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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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M. Simms                                                                                                             !
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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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