ML072040115

Watts Bar Nuclear Plant (WBN) Unit 1 - Withdrawal of WBN TS-06-09 Technical Specification Change Request for Ultimate Heat Sink (UHS) Temperature

ML072040115
Person / Time
Site:	Watts Bar
Issue date:	07/20/2007
From:	Smith J D Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC MD1460, WBN TS-06-09
Download: ML072040115 (3)

Text

July 20, 2007 10 CFR 50.90 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Gentlemen:

In the Matter of ) Docket No. 50-390 Tennessee Valley Authority )

WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 - WITHDRAWAL OF WBN TS-06-09 TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK (UHS) TEMPERATURE (TAC NO. MD 1460)

On June 7, 2007, the staff issued a request for additional information (RAI)concerning the subject amendment request that

was submitted to NRC on May 8, 2006. In preparing the responses

to the staff questions, TVA has determined that the Essential Raw

Cooling Water (ERCW) pre-operational flows being utilized to

support the increase to 88 degrees F will result in little to no

margin with respect to the current equipment qualification

temperatures in some areas. Also, a review of the current ERCW

pump performance has identified pumps that are performing below

the pre-operational flow value margins. In order to resolve

these items and to quantify the ERCW flows and margins, TVA is

withdrawing Technical Specification change request TS-06-09 at

this time. A flow model is being developed for the ERCW system

and testing during the February 2008 outage is planned to

validate the model. In addition, TVA will establish actual flows

necessary to support the increase in UHS temperature to 88

degrees F.

U.S. Nuclear Regulatory Commission Page 2 July 20, 2007 TVA recognizes and appreciates that the staff has expended significant resources in reviewing this licensing action and

encourages the staff to retain the documentation assembled during

this review. TVA intends to resubmit the request following the

establishment of a quantified approach for the margins which will

address the concerns identified by the staff in the June 7, 2007

RAI. There are no regulatory commitments associated with this

submittal. If you have any questions concerning this matter, please call me at (423)365-1824.

Sincerely, Original signed by J. D. Smith Manager, Site Licensing and Industry Affairs (Acting) cc see page 3 U.S. Nuclear Regulatory Commission Page 3 July 20, 2007 cc NRC Resident Inspector Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381 Mr. Brendan T. Moroney, Project Manager U.S. Nuclear Regulatory Commission MS 08G9a One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 Mr. Lawrence E. Nanny, Director Division of Radiological Health 3 rd Floor L & C Annex 401 Church Street Nashville, Tennessee 37243