ML082540496

Draft Diablo Canyon, Units 1 and 2, Request for Additional Information, Revise TS 3.7.5, Auxiliary Feedwater System and 3.7.6, Condensate Storage Tank and Fire Water Storage Tank

ML082540496
Person / Time
Site:	Diablo Canyon
Issue date:	07/24/2008
From:	Kamal Manoly Division of Engineering
To:	Thadani M Plant Licensing Branch IV
Manoly K
Shared Package
ML082540414	List: ML082540496
References
LAR 08-02, TAC MD8471, TAC MD8472
Download: ML082540496 (3)

Text

MEMORANDUM TO: Mohan Thadani, Acting Chief Plant Licensing Branch IV Division of Operating Reactors and Licensing Office of Nuclear Reactor Regulation FROM: Kamal A. Manoly, Chief Mechanical & Civil Engineering Branch Division of Engineering Office of Nuclear Reactor Regulation

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE DIABLO CANYION POWER PLANT, UNITS 1 AND 2, LICENSE AMENDMENT REQUEST 08-02, REVISION TO TECHNICAL SPECIFICATIONS 3.7.5, AUXILIARY FEEDWATER SYSTEM, AND 3.7.6, CONDENSATE STORAGE TANK AND FIRE WATER STORAGE TANK, (TAC NOS. MD8471 AND MD8472).

The Mechanical and Civil Engineering Branch staff is currently reviewing the request by the Pacific Gas and Electric Company dated April 3, 2008, to amend the license of the Diablo Canyon Power Plant, Units 1 and 2 by revising Technical Specifications 3.7.5 and 3.7.6. The staff has identified additional information, as stated in the enclosed RAI, that is needed to complete the review of this request.

Docket Nos. 50-275 50-323

Enclosure:

As stated CONTACT: M. Hartzman, DE/EMCB (301) 415-2755

MEMORANDUM TO: Mohan Thadani, Acting Chief Plant Licensing Branch IV Division of Operating Reactors and Licensing Office of Nuclear Reactor Regulation FROM: Kamal A. Manoly, Chief Mechanical & Civil Engineering Branch Division of Engineering Office of Nuclear Reactor Regulation

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE DIABLO CANYON POWER PLANT, UNITS 1 AND 2, LICENSE AMENDMENT REQUEST 08-02, REVISION TO TECHNICAL SPECIFICATIONS 3.7.5, AUXILIARY FEEDWATER SYSTEM, AND 3.7.6, CONDENSATE STORAGE TANK AND FIRE WATER STORAGE TANK, (TAC NOS. MD8471 AND MD8472).

The Mechanical and Civil Engineering Branch staff is currently reviewing the request by the Pacific Gas and Electric Company dated April 3, 2008 to amend the license of the Diablo Canyon Power Plant, Units 1 and 2 by revising Technical Specifications 3.7.5 and 3.7.6. The staff has identified additional information, as stated in the enclosed RAI, that is needed to complete the review of this request.

Docket Nos. 50-275 50-323

Enclosure:

As stated CONTACT: M. Hartzman, DE/EMCB (301) 415-2755 Distribution:

EMCB RF AWang OFFICE EMCB:DE EMCB:DE NAME MHartzman KManoly DATE / /2008 / /2008 OFFICIAL RECORD

MECHANICAL AND CIVIL ENGINEERING BRANCH DIVISION OF ENGINEERING OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION DIABLO CANYON POWER PLANT, UNITS 1 AND 2 AUXILIARY FEEDWATER SYSTEM (AFW) AND CONDENSATE STORAGE TANK (CST)

TECHNICAL SPECIFICATION CHANGES The proposed TS changes are based on modifying the CST to ensure an adequate supply of safety related water is available to the AFW system for the limiting condition of operation. The modification consists in the installation of metal plenums at tank mid-height elevation that will increase the volume of safety grade water. Based on the submitted information, the total weight of the plenums is approximately 1350 lb. The center of gravity of these plenums is located approximately 23 feet above the bottom of the CST. The seismic requalification of the CST with the plenums was done under 10 CFR 50.59.

1. Provide a description of the seismic analysis of the CST with the attached plenums.

2. State whether the tank wall was checked for local and elephant foot buckling, or if not, provide justification for not checking.

3. State that the local stresses induced in the tank wall at the location of the attachment of the plenums meet the design allowable loads or stresses of the licensing basis construction code under the applicable loads and loading combinations.

4. Provide the minimum calculated stress ratio in the CST resulting from the addition of the plenums.

ENCLOSURE