ML20214Q864
| ML20214Q864 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/01/1987 |
| From: | Zwolinski J NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML20214Q867 | List: |
| References | |
| TAC-63977, TAC-63978, NUDOCS 8706050229 | |
| Download: ML20214Q864 (3) | |
Text
m t
Q UCy cf UNITED STATES o
$ !' 3 i
NUCLEAR REGULATORY COMMISSION
{,
W ASHINGTON, D. C. 20555
\\
/
June 1, 1987 Docket Nos.: 50-327/328 Mr. S. A. White Manager of Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Place Chattanooga, Tennessee 37402-2801
Dear Mr. White:
SUBJECT:
BYPASSED AND INOPERABLE STATUS PANEL REPLACEMENT (TAC 63977/63978)
Re:
Sequoyah Nuclear Plant, Units 1 and 2 By letter dated September 13, 1982 letter, the Tennessee Valley Authority (TVA) informed the staff of its plans to permanently remove the status monitor-ing system (SMS) from the Sequoyah Units 1 & 2 due to reliability problems.
The SMS function of providing autenatic bypassed and inoperable status indica-tion (BISI) in the control room per the guidance of Regulatory Guide 1.47,
" Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety Systems," was to be performed by the Technical Support Center Data System.
Subsequently, af ter a design change for SMS removal was issued on March 22, 1983, and completed shortly thereafter, the licensee experienced difficulty in incorporating the B,1SI function into inoperable status indication in the control rooms. TVA, in an October 31, 1986 letter, stated that an evaluation in accordance with 10 CFR 50.59 was performed and a conclusion was reached that there was no unreviewed safety question associated with the BISI removal.
Additionally, in that letter TVA indicated that plant administrative procedures and indicators will be utilized to assist the operator in determining safety system status and that during outages in 1990 a new BISI system conforming to the guidelines of Regulatory Guide 1.47 would be installed in each unit.
In a letter dated February 17, 1987, TVA responded to the staff's January 28, 1987, request for additional information on the BISI removal. TVA provided a detailed evaluation that the use of administrative procedures, in lieu of the automatic BISI system, for safety system status monitoring did not involve an unreviewed safety question. Also in its letter, TVA committed to have the new BISI systems implemented during the cycle 4 outages for each unit (approximately 2 years following restart).
8706050229 070601 PDR ADOCK 0500 7
P k
Mr. S. A. White June 1, 1987 The staff has reviewed the TVA evaluation and the detailed answers to the staff's questions relating to administrative procedures for system status monitoring contained in the February 17, 1987 letter, and finds it acceptable.
The staff concludes Sequoyah Units 1 & 2 may operate relying on administrative procedures, in lieu of an automatic means, for determination of safety system status until cycle 4 outage when the new BISI system is installed. This is documented in the enclosed evaluation. Based on the fact that the staff finds the use of administrative procedures acceptable, we consider this issue resolved for restart.
If you require any additional assistance, please contact the Sequoyah project manager, Tom Rotella, at (301) 492-8199.
Sincerely, Original signed by:
John A. Zwolinski, Assistant Director for Projects Division of TVA Projects Office of Special Projects
Enclosure:
Safety Evaluation cc: See next page DISTRIBllTION Docket File JPartlow NRC PDR EJordan Local PDR FMiraglia JAxelrad OGC-BETH SEbneter Project Rdg.
SRichardson SEQ File JZwolinski BKSingh/MFields BDLiaw JDonohew GZech, RII TRotella SRConnelly, 01A JKelly BHayes, 01 FBurrows CJamerson TVA-BETH ACRS (10)
\\A b
h
/
OSkTVA 3
CSP:DTV OSP:
A(EC)
$Pj A TPD OSP:DTVA Todich TPotell BDiiaw
}Jij//[/87 CJamerson
(/i /87 6 /m /87 6/yT/87
' / p /87 DTV DTVA:AD P JDo w
JZwolinski g
/87 y /g /07
.=
r i
Mr. S. A. White Tennessee Valley Authority Sequoyah Nuclear Plant CC:
J Tennessee Department of Regional Administrator, Region II Public Health U.S. Nuclear Regulatory Commission, 4
ATTN: Director, Bureau of 101 Marietta Street, N.W.
Environmental Health Services Atlanta, Georgia 30323 l
Cordell Hull Building Nashville, Tennessee 37219 i
Mr. R. W. Cantrell ATTN:
D.L. Williams Mr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health 400 West Summit Hill Drive, W12 A12 T.E.R.R.A. Building Knoxville, Tennessee 37902 150 9th Avenue North Nashville, Tennessee 37203 Mr. Bob Faas I
Westinghouse Electric Corp.
County Judge P.O. Box 355 Hamilton County Courthouse j,
Pittsburgh, Pennsylvania 15230 Chattanooga, Tennessee 37402 i
Mr. R. L. Gridley Mr. Richard King Tennessee Valley Authority c/o U.S. GA0 SN 157B Lookout Place 1111 North Shore Drive Chattanooga, Tennes.see 37402-2801 Suite 225, Box 194 Knoxville, Tennessee 37919 Mr. M. R. Harding Tennessee Valley Authority Sequoyah Nuclear Plant P.O. Box 2000 Soddy Daisy, Tennessee 37379 l
Resident Inspector /Sequoyah NP c/o U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 i
Mr. H.L. Abercrombie i
Tennessee Valley Authority Sequoyah Nuclear Plant P.O. Box 2000 Soddy Daisy, Tennessee 37379 i
i 4
. _ - -, -