ML20133B225

Submits Addl Info on Review of Turbine Bldg Elevation 21 Ft Masonry Wall Adjacent to HX E-4A,in Response to NRC 840918-19 Site Insp,Per IE Bulletin 80-11 Re Masonry Wall Design.Sketches Encl

ML20133B225
Person / Time
Site:	Maine Yankee
Issue date:	09/24/1985
From:	Whittier G Maine Yankee
To:	Butcher E Office of Nuclear Reactor Regulation
References
6437L-SDE, GDW-85-244, IEB-80-11, MN-85-167, NUDOCS 8510030095
Download: ML20133B225 (4)

Text

. .

EDISON DRIVE MAIRE HARHEE ATOMICPOWER00mPARUe nuouSrx. ua,nE oasse (207) 623-3521 O

September 24, 1985 MN-85-167 GDW-85-244 Director of Nuclear Reactor Regulation United States Ntclear Regulatory Commission' Washington, D. C. 20555 Attention: Mr. Edward J. Butcher, Jr.

Acting Branch Chief Operating Reactors Branch No. 3 Division of Licensing

References:

(a) License No. DPR-36 (Docket No. 50-309)

(b) USNRC Letter to MYAPCo dated May 8,1980 - IE Bulletin 80-11 (c) MYAPCo Letter to USNRC dated April 22, 1985 (MN-85-78)

Subject:

Additional Information on IE Bulletin 80 Masonry Wall Design Gentlemen:

As'a result of the site inspection of masonry walls at Maine Yankee by NRC staff representatives P. Sears and N. Chokshi on September 18-19, 1985, Maine Yankee was requested to provide additional information on our review of the Turoine Building EL 21'0" masonry wall adjacent to heat exchanger Hx E-4A, Reference (c). This letter and the attached sketches provide the requested information.

d[sh'ownorIt'he'attacneoskelchestheblockwalladjacenttoHxE-4Ais within 1"-4" of the heat exchanger and the top of the wall is only 4" above the centerline of the heat exchanger.

The consequence analysis performed to assess the impact of this wall collapsing during a seismic event. consisted of two tasks. First, the wall was assumed to pivot about its base and strike the heat exchanger with a line load along its longitudinal centerline. This impact resulted in a shell stress of approximately 4 ksi, well below the shell material allowable. Second, a detailed reinspection of the heat exchanger was performed by Yankee Nuclear Services Division on September 19, 1985, to ensure that there were no small attachments to the heat exchanger shell which could be damaged by block debris. This reinspection found no attachments which could be damaged (the heat excnMger was originally inspected on or about December 15, 1980).

8510030095 850924 PDR ADOCK 05000309 hg G PDR \

6437L-SDE

MAINE YANKEE ATOMIC POWER COMPANY United States Nuclear Regulatory Commission Page Two Attention: Mr. Edward J. Butcher, Jr., Acting Branch Chief MN-85-167 Based upon the' analysis and inspection described above, it was concluded

. that~ the failure of the block wall was acceptable since its collapse will not damage any safety-related equipment.

If you have any questions, please do not hesitate to contact us.

Very truly yours, MIE YANKEE ATOMIC POWER COWANY b

G. D. Whittier, Manager Nuclear Engineering & Licensing SDE/bjp.

Enclosures:

cc: Dr. Thomas E. Murley-Mr. Cornelius F. Holden 9

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