ML101940474

Request for Additional Information, Licensees Final Safety Analysis Report Amendment Related to Chapter 10.4.7

ML101940474
Person / Time
Site:	Watts Bar
Issue date:	07/30/2010
From:	Justin Poole Watts Bar Special Projects Branch
To:	Bhatnagar A Tennessee Valley Authority
Poole Justin 301-415-2048
References
TAC ME3091
Download: ML101940474 (3)

Text

July 30, 2010 Mr. Ashok S. Bhatnagar Senior Vice President Nuclear Generation Development and Construction Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

WATTS BAR NUCLEAR PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING FINAL SAFETY ANALYSIS REPORT AMENDMENT RELATED TO CONDENSATE AND FEEDWATER (TAC NO. ME3091)

Dear Mr. Bhatnagar:

By letter dated January 11, 2010 (Agencywide Documents Access and Management System Accession No. ML100191426), the Tennessee Valley Authority submitted Final Safety Analysis Report Amendment No. 97 for Watts Bar Nuclear Plant, Unit 2.

The Nuclear Regulatory Commission staff reviewed the information provided and determined that further information is required to complete its assessment of the applicants submittal. The specific information requested is addressed in the enclosure to this letter.

We request your response within 30 days of receipt of this letter.

If you should have any questions, please contact me at 301-415-2048.

Sincerely,

/RA PMilano for/

Justin C. Poole, Project Manager Watts Bar Special Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-391

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv

Mr. Ashok S. Bhatnagar Senior Vice President Nuclear Generation Development and Construction Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

WATTS BAR NUCLEAR PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING FINAL SAFETY ANALYSIS REPORT AMENDMENT RELATED TO CONDENSATE AND FEEDWATER (TAC NO.

ME3091)

Dear Mr. Bhatnagar:

By letter dated January 11, 2010 (Agencywide Documents Access and Management System Accession No. ML100191426), the Tennessee Valley Authority submitted Final Safety Analysis Report Amendment No. 97 for Watts Bar Nuclear Plant, Unit 2.

The Nuclear Regulatory Commission staff reviewed the information provided and determined that further information is required to complete its assessment of the applicants submittal. The specific information requested is addressed in the enclosure to this letter.

We request your response within 30 days of receipt of this letter.

If you should have any questions, please contact me at 301-415-2048.

Sincerely,

/RA PMilano for/

Justin C. Poole, Project Manager Watts Bar Special Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-391

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION:

RidsOgcRp Resource RidsRgn2MailCenter Resource PUBLIC RidsNrrDorlLpwb Resource RidsNrrDssSbpb Resource LPWB Reading File RidsNrrLABClayton Resource RidsNrrPMWattsBar2 Resource RidsAcrsAcnw_MailCTR Resource RidsNrrDorlDpr ADAMS Accession No. ML101940474 OFFICE LPWB/PM LPWB/LA NRR/SBPB/BC OGC LPWB/BC NAME JPoole BClayton GCasto DRoth/NLO SCampbell DATE 07 / 22 /10 07 / 22 /10 07 / 26 /10 07/ 27/10 07 / 30 /10 OFFICIAL AGENCY RECORD

Enclosure REQUEST FOR ADDITIONAL INFROMATION WATTS BAR NUCLEAR PLANT, UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT NO. 97 TENNESSEE VALLEY AUTHORITY DOCKET NO. 50-391 In Amendment No. 75 dated March 4, 2009 (Agencywide Documents Access and Management System Accession No. ML090480566), the Nuclear Regulatory Commission (NRC) approved a revision to Technical Specification (TS) 3.3.2, "Engineered Safety Feature Actuation System (ESFAS) Instrumentation," for Watts Bar Nuclear Plant (WBN) Unit 1. Specifically, this amendment revised the requirements for the auxiliary feedwater system (AFW) auto-start function associated with the trip of the turbine-driven main feedwater (TDMFW) pumps.

The ESFAS circuitry provides an automatic start of the AFW pumps in the event both TDMFW pumps trip. The proposed Final Safety Analysis Report (FSAR) Section 10.4.7 for WBN Unit 2 does not provide a description of this logic. However, FSAR Chapter 15 states that in order to provide the necessary protection against the loss of normal feedwater, the motor-driven AFW and turbine-driven AFW pumps will start automatically upon a trip of both TDMFW pumps.

WBN Units 1 and 2 do not have a block of the automatic AFW pump start circuit upon a trip of both TDMFW pumps to use during startup of the first TDMFW pump. In WBN Unit 1 Amendment 75, Mode 2 applicability for this function added a note stating: When one or more Turbine Driven Feedwater Pump(s) are supplying feedwater to steam generators."

Discuss whether the changes made to TS 3.3.2 for WBN Unit 1 in Amendment 75 will be made in the proposed FSAR and TSs for Unit 2. If not, provide detailed information regarding the logic to provide an automatic start of the AFW pumps and how that logic is controlled during a plant startup.