ML19319C172

Responds to AEC 720926 Request for Review of Seismic Equipment Failure Effect on safety-related Equpment.Design Mods Implemented,Upgrading Piping Sys.Same Valves Added Mitigating Water Flow Into Failed Sys

ML19319C172
Person / Time
Site:	Davis Besse
Issue date:	01/26/1973
From:	Sampson G TOLEDO EDISON CO.
To:	Deyoung R US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML19319C173	List: ML19319C172 ML19319C178
References
NUDOCS 8001310530
Download: ML19319C172 (1)

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GLENN J. SWPSCN ts., x., fy.f v c. pres.eene. pa.or s ' Q.:

M January 26, 1973 Mr. R. C. DeYoung, Assistant Directar for Pressurized Water Reactors Directorate of Licensing U.S. Atomic Energy Coc=ission Washington, D.C.

20545 Docket No. 50-3h6

Dear Mr. DeYoung:

Our October 30, 1972, letter in response to your september 26, 1972, request for Toledo Edison to review the Davis-Eesse Nuclear Power Station non-Class I (seis=ic) equip =ent that =ight potentially adversely affect the perfor=ance of safety-related equipment, pro =ised a further reply within 90 days. This

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A detailed review was made of non-Class I (seis=ic) syste=s and co=ponents to deter =ine whether failures could adversely affect safety-related syste=s and equip =ent by any of the following = odes :

1.

Falling of non-Class I (seismic) equipr.ent onto essential safety equip-

=ent.

Spraying of essential safety equipment due to non-Class I (seismic) co=-

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ponent rupture.

3.

Flooding of essential safety equipment due to non-Class I (seis=ic) co=-

ponent rupture.

This review has resulted in sc=e design =odificatiens to ensure that safety-

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related equip =ent vould not be adversely affected. Portions of the fire pro-2 tection piping have been upgraded to Class I (seis=ic) design and portions of

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several other piping syste=s are being upgraded to Class I (seismic) design.

In certain areas, curbing is being added where water frc= potential ruptures

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j might affect safety-related equipment at that or sc=e 1cwer building elevation.

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So=e valves, both autc=atic and =anual, are being added to certain piping

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syste=s to prevent or =itigate flow of water into a failed syste=.

9J So=e portions of this review are still under study, but all design require =ents vill be established within 90 days.

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Yours very truly,

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-b THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISCN AVEN TCLEDO[ HIO 43652 caS:cd

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