ML20212K868

Forwards Corrected Safety Evaluation Re Projected Values of Matl Properties for Fracture Toughness Requirements for Protection Against Pressurized Thermal Shock Events. Corrections Listed

ML20212K868
Person / Time
Site:	Prairie Island
Issue date:	08/18/1986
From:	Diianni D Office of Nuclear Reactor Regulation
To:	Musolf D NORTHERN STATES POWER CO.
Shared Package
ML20212K873	List: ML20212K868 ML20212K880
References
REF-GTECI-A-49, REF-GTECI-RV, TASK-A-49, TASK-OR NUDOCS 8608250097
Download: ML20212K868 (2)

Text

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'o,, UNITED STATES P[ ,

4, n NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555

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r"318 CG Docket No. 50-282 Mr. D. M. Musolf, Manager Nuclear Support Services Northern States Power Company 414 Nicollet Mall Midland Square, 4th Floor Minneapolis, Minnesota 55401

SUBJECT:

PROJECTED VALUES OF MATERIAL PROPERTIES FOR FRACTURE TOUGHNESS REQUIREMENTS FOR PROTECTION AGAINST PRESSURIZED THERMAL SHOCK EVENTS-PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT NO. 1 On June 23, 1986, the Commission issued a Safety Evaluation (SE) on

" Projected Values of Material Properties for Fracture Toughness Requirements For Protection Against Pressurized Thermal Shock Events" for Prairie Island

- Nuclear Generating Plant Unit No. 1. Errors have been found on pages 2 and 3 of the SE.

Corrections are listed below and a reissue of the SE is enclosed.

1. Top of page 2 - The number for " Utility Submittal" for "M (Margin, F) was left out. The number should be "59."

2. Page 2 " Evaluation of the Calculated RT " - The material properties ofthecontrollingmaterialandtheass$Natedmarginandchemistry factor were incorrect for copper and nickel. The correct factor is 0.14 for copper (Cu) and 0.17 for nickel (Ni). This error causes the equation to change.

3. Page 33 line 2 and line 4 from top of page "189.4 F" should be "154.1 F" for the limiting circumferential weld material.

860easco97 DR ADocg a60818 p 99999282 PDR

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Pageg,)line3-thelargemarginbecomes"(145.9F)"insteadof 110.6 F .

Please accept our apologies for any inconvenience these errors may have caused you.

Sincerely, s/

Dominic C. Dilanni, Project Manager 3

Project Directorate #1 Division of PWR Licensing-A 3-

Enclosure:

'As Stated

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Office: LA/ PAD #1 PM/ PAD #1%4h P / PAD #::

Surname: PShuttlew .

DDilanni/lp Glear Date: 08//.F/86 08/ /f/86 08/lf/86

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