ML12011A027

Request for Additional Information Regarding the Proposed Technical Specification Changes to Allow Used of Shield Building Dome Penetrations During Modes 1 Through 4

ML12011A027
Person / Time
Site:	Sequoyah
Issue date:	01/30/2012
From:	Siva Lingam Plant Licensing Branch II
To:	James Shea Tennessee Valley Authority
Lingam S
References
TAC ME7026
Download: ML12011A027 (3)

Text

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1-" ~O Mr. Joseph W. Shea Manager, Corporate Nuclear Licensing Tennessee Valley Authority 3R Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

SEOUOYAH NUCLEAR PLANT, UNIT 2 - REOUEST FOR ADDITIONAL INFORMATION REGARDING THE PROPOSED TECHNICAL SPECIFICATION CHANGES TO ALLOW USE OF SHIELD BUILDING DOME PENETRATIONS DURING MODES 1 THROUGH 4 (TAC NO. ME7026)

Dear Mr. Shea:

By letter dated August 31, 2011, and supplemented by letter dated November 28,2011, you submitted an application for license amendment proposing to temporarily revise the Sequoyah Nuclear Plant (SON), Unit 2, Technical Specifications. During the SON, Unit 2 spring 2011 refueling outage (RFO), two penetrations through the shield building (SB) dome were created.

To maintain SB integrity, these penetrations were closed with a steel hatch assembly prior to entering Mode 4 at the end of the spring 2011 RFO. The proposed change will allow opening of one of the penetration hatches in the SB dome for up to 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> per day, 6 days per calendar week while in Modes 1 through 4 during SON, Unit 2, Cycle 18 (U2R18) between receipt of Nuclear Regulatory Commission (NRC) approval for this proposed request, and until entering Mode 5 at the start of the SON, Unit 2 fall 2012 RFO (U2R18).

The NRC staff is reviewing the submittal and has determined that additional information is required to complete its evaluation. This request was discussed with Mr. Clyde Mackaman of your staff on January 11, 2012, and it was agreed that a response would be provided within 30 days from the date of this letter.

If you have any questions regarding this matter, I can be reached at 301-415-1564.

Sincerely,

~~'~

Siva P. Lingam, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-328

Enclosure:

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

REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION CHANGES TO ALLOW USE OF SHIELD BUILDING DOME PENETRATIONS DURING MODES 1 THROUGH 4 SEQUOYAH NUCLEAR PLANT, UNIT 2 DOCKET NO. 50-328 By letter dated August 31, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML11249A061), and supplemented by letter dated November 28, 2011 (ADAMS Accession No. ML11334A054), the Tennessee Valley Authority (the licensee),

submitted a license amendment request (LAR) to revise the Sequoyah Nuclear Plant (SQN),

Unit 2, Technical SpeCifications (TSs) to allow the use of one of the penetration hatches in the shield building dome for up to 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> per day, 6 days per calendar week while in Modes 1 through 4 during SQN, Unit 2, Cycle 18 (U2R18) between receipt of Nuclear Regulatory Commission (NRC) approval for this proposed request, and until entering Mode 5 at the start of the SQN, Unit 2 fall 2012 refueling outage (U2R18). In order to complete its review of the above documents, the NRC staff needs the following additional information:

When discussing the control room dose analyses on page A6-2 in Attachment 6 of the licensee's letter dated August 31,2011, the licensee stated:

"Preliminary ARCON96 runs indicated that the worst case X/Q values for releases from the open penetration will be greater than the vent X/Q, however these values are within a factor of 2 of the design basis vent X/Q values."

Please provide the worst case X/Q values for releases from the open penetration. Also, provide a copy of the meteorological data inputs and program outputs for the atmospheric dispersion computer codes (e.g., ARCON96) used to generate the worst case X/Q values. Any assumptions and inputs associated with the use of the computer codes that are not included in the current application, Updated Final Safety Analysis Report, or other docketed information should also be provided.

Please provide a site plan highlighting the locations of all potential accident release pathways and control room intake and unfiltered inleakage pathways. Drawings should be to scale and show true north. If the diagram included on page A6-5 satisfies these criteria, please provide a more legible version.

Enclosure

January 30, 2012 Mr. Joseph W. Shea Manager, Corporate Nuclear Licensing Tennessee Valley Authority 3R Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

SEQUOYAH NUCLEAR PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THE PROPOSED TECHNICAL SPECIFICATION CHANGES TO ALLOW USE OF SHIELD BUILDING DOME PENETRATIONS DURING MODES 1 THROUGH 4 (TAC NO. ME7026)

Dear Mr. Shea:

By letter dated August 31, 2011, and supplemented by letter dated November 28,2011, you submitted an application for license amendment proposing to temporarily revise the Sequoyah Nuclear Plant (SQN), Unit 2, Technical Specifications. During the SQN, Unit 2 spring 2011 refueling outage (RFO), two penetrations through the shield building (SB) dome were created.

To maintain SB integrity, these penetrations were closed with a steel hatch assembly prior to entering Mode 4 at the end of the spring 2011 RFO. The proposed change will allow opening of one of the penetration hatches in the SB dome for up to 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> per day, 6 days per calendar week while in Modes 1 through 4 during SQN, Unit 2, Cycle 18 (U2R18) between receipt of Nuclear Regulatory Commission (NRC) approval for this proposed request, and until entering Mode 5 at the start of the SQN, Unit 2 fall 2012 RFO (U2R18).

The NRC staff is reviewing the submittal and has determined that additional information is required to complete its evaluation. This request was discussed with Mr. Clyde Mackaman of your staff on January 11, 2012, and it was agreed that a response would be provided within 30 days from the date of this letter.

If you have any questions regarding this matter, I can be reached at 301-415-1564.

Sincerely, IRA!

Siva P. Lingam, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-328

Enclosure:

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

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DATE 1/11112 1/11/12 1/10/12* 1127112 1/30/12 OFFICIAL RECORD COpy