ML19330B981
| ML19330B981 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/05/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8008070344 | |
| Download: ML19330B981 (2) | |
Text
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O V
TENNESSEE VALLEY AUTHORITY CH ATTANCOG A, TENNESSEE 37401 400 Chestnut Street Tower II August 5, 1980 T.)/C 6 D
Director of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief
.[:T.V::15 Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Schwencer:
In the Matter of the Application of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 This letter is a revision to my letter to you of July 28, 1980. This letter clarifies the TVA position on the use of the new ERCW pumping station between unit 1 and unit 2 operations.
Enclosed for your review is a preliminary assessment of the potential for a barge tow heading upstream impacting the new Essential Raw Cooling Water (ERCW) pumping station at Sequoyah Nuclear Plant. The preliminary upper bound probability for impact has been determined to be approximately 10-7 per year per vessel heading upstream. Evaluation of upstream river traffic passing impact of approximately 10 gvative upper bound (preliminary) probability of the site results in a conse per year.
No evaluation of the potential consequences of such a barge impact has been performed to date.
Until this evaluation is finalized and this issue is resolved, the existing (currently utilized) ERCW pumping station will be operational for providing ERCW for unit 1 operation and will act as a backup to the new ERCW pumping si,ation after the new pumping station is put into service. ' Therefore, resolution of this issue has no bearing on the safe operation of the plant during the interim period.
Very truly yours, TENNESSEE VALLEY AUTHORITY b
C h
L. M. Mills, Manager Nuclear Regulation and Safety Enclosure 3oN 80080703).I m
~
.r NEW ERCW PUMPING STATION CONCERNS REGARDING BARGE I.SACT AND IL ZARDOUS MATERIALS TVA is currently evaluating the potential of a barge tow heading upstream impacting the new ERCW pumping station. An evaluation of hasardous materials shipped past the site is included in section 2.2.3 of the FSAR. Until this evaluation is finalised and this issue is resolved, the existing (currently utilised) ERCW pu= ping station will be operational for providing ERCW for unit 1 operation and will act as,a backup to the new ERCW pu= ping station af ter the new pumping station is put into service. Therefore, resolution of this issue has no bearing en the safe operation of the plant during the interim.
TVA has perfor=ed a very conservative, preli=inary assessment of a barge heading upstream impacting the pu= ping station based upon a li=ited data base (three years) of river traffic infor=ation. This shows the upper bound probability of a barge tow i=pacting the pu= ping station to be approxi=ately 10-I per year per vessel heading upstream.
Evaluating the upstrea river traffic passing the site shows a low probability for impacting the new pumping station (approximately 10 per year). This assessment is a bounding analysis utilizing very conservative assumptions. Additional river traffic inforestion is being obtained and'a complete evaluation is currently underway.
SCNJFC-CC 9
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