ML20236E145

Forwards Final Draft Rept, Impact of Radiation Embrittlement on Integrity of Pressure Vessel Supports for Two PWR Plants. Meeting w/util,C-E & Westinghouse Owners Group Will Be Scheduled in mid-Mar 1989 Re Embrittlement

ML20236E145
Person / Time
Site:	Davis Besse
Issue date:	02/27/1989
From:	Holahan G Office of Nuclear Reactor Regulation
To:	Shelton D TOLEDO EDISON CO.
Shared Package
ML20235B069	List: ML20235B066 ML20236E145
References
NUDOCS 8903230464
Download: ML20236E145 (3)

Text

__- ___ -

.. F6btuary 27,.1989 i

~ Docket No. 50-346

~

Mr. Donald C. Shelton Vice President - Nuclear.

Toledo Edison Company 300 Madison Avenue Toledo, Ohio -43652

SUBJECT:

EMBRITTLEMENT OF REACTOR ~ VESSEL' SUPPORTS Since April 1988, the NRC staff.has been investigating the potential significance of the effects of low-temperature, low-flux embrittlement on the structural-integrity of reactor vessel supports. The reviews to date have concluded-that.

this issue does not pose an immediate concern to public safety, but.it challenges the margins provided by the defense-in-depth concept. Accordingly, we would like to meet with your representatives (as well as the Combustion -

Engineering and Westinghouse Owners Group) in mid-March 1989 to discuss embrittlenient of reactor vessel supports.

l To assist you in your preparation for-the meeting; I have enclosed two documents for your review. One is the Oak Ridge National Laboratory Final Draft Report on this issue, and the other is the staff's evaluation. We will be in touch.with you-in the near fu'ture to establish'a meeting date.

Sincerely,

' original signed by l

Gary M. Holahan, Acting Director Division of Reactor. Projects III, l

IV, V, and Special Projects Office.of Nuclear Reactor Regulation

Enclosures:

1.

" Impact of Radiation Embrittlement'on Integrity of Pressure Vessel Supports for Two PWR Plants," 0RNL/TM-10966, Final Draft, 12/7/88 2.

Staff Evaluation of Embrittlement of Reactor Vessel Supports,.1/89 cc: w/ enclosures See next page sed

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February 27, 1989 Docket No. 50-346 Mr. Donald C. Shelton 1

Vice President - Nuclear i

Toledo Edison Company 1

300 Madison Avenue i

Toledo, Ohio 43652

Dear Mr. Shelton:

SUBJECTi EMBRITTLEMENT OF REACTOR VESSEL SUPPORTS Since April 1988, the NRC staff has been investigating the potential significance of the effects of low-temperature, low-flux embrittlement on the structural integrity of reactor vessel suppcrts. The reviews to date have concluded that this issue does not pose an innediate concern to public safety, but it challenges the margins provided by the defense-in-depth concept. Accordingly, we would like to meet with your representatives (as well as the Combustion EngineeringandWestinghouseOwnersGroup)inmid-March 1989todiscuss embrittlement of reactor vessel supports.

To assist you in your preparation for the meeting, I have enclosed two documents for your review. One is the Oak Ridge National Laboratory Final Draft Report on this issue, and the other is the staff's evaluation. We will be in touch with you in the near future to establish a meeting date.

Sincerely, h

Y Gary M. Holahan, Acting Director Division of Reactor Projects III,

)

IV, V, and Special Projects Office of Nuclear Reactor Regulation 1

Enclosures:

1.

" Impact of Radiation Embrittlement on Integrity of Pressure Vessel Supports for Two PWR Plants," ORNL/TM-10966, Final Draft, 12/7/88 2.

Staff Evaluation of Embrittlement of Reactor Vessel Supports, 1/89 cc: w/ enclosures See next page q

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1 Mr. Donald C. Shelton Davis-Besse Nuclear Power Station l

Toledo Edison Company Unit No. 1 l

.CC:

4 David E. Burke, Esq.

The Cleveland Electric Radiological Health Program 111uminating Company Ohio Department of Health P. O. Box 5000 1224 Kinnear Road Cleveland, Ohio 44101 Columbus, Ohio 43212 Mr. Robert W. Schrauder Attorney General Manager, Nuclear Licensing Department of Attorney Toledo Edison Company General i

Edison Plaza 30 East Broad Street 300 Madison Avenue Columbus, Ohio 43215 Toledo, Ohio 43652 l

Mr. James W. Harris, Director Gerald Charnoff, Esq.

(Addressee Only) l Shaw, Pittman, Potts Division of Power Generation

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and Trowbridge Ohio Department of Industrial Relations 4

2300 N Street N.W.

2323 West 5th Avenue Washington, D.C. 20037 P. O. Box 825 Columbus, Ohio 43216 i

Regional Administrator, Region III j

U.S. Nuclear Regulatory Comission Ohio Environmental Protection Agency l

799 Roosevelt Road 361 East Broad Street j

l Glen Ellyn, Illinois Columbus, Ohio 43266-0558 i

l Fresident, Beard of Mr. Robert B. Borsum County Commissioners of Babcock & Wilcox Ottawa County Nuclear Power Generation Division Port Clinton, Ohio 43452 Suite 525, 1700 Rockville Pike Rockville, Maryland 20852 State of Ohio Public Utilities Comission i

Resident Inspector 180 East Broad Street a

U.S. Nuclear Regulatory Commission Columbus, Ohio 43266-0573 l

5503 N. State Route 2 Oak Harbor, Ohio 43449 1

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