ML20009H263

Submits Results of Investigation of Apr 1981 Event Re Dents in Overhead Crane.Crane May Require Repair.Related Correspondence

ML20009H263
Person / Time
Site:	Dresden
Issue date:	08/03/1981
From:	Steptoe P ISHAM, LINCOLN & BEALE
To:	Atomic Safety and Licensing Board Panel
References
ISSUANCES-SP, NUDOCS 8108070119
Download: ML20009H263 (2)

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ro Branch UNITED STATES OF AMERICA e NUCLEAR REGULATORY COMMISSION THE ATOMIC SAFETY AND LICENSING BOARD In the Matter of )

) Docket Nos. 50-237-SP COMMONWEALTH EDISON COMPANY ) 50-249-SP

) (Spent Fuel Pool (Dresden Station, Units 2 & 3)) Modification)

Dear Administrative Judges:

Pursuant to the tenets of full disclosure as articulated by the Appeal Board in Duke Power Company (Willian B. McGuire Nuclear Station, Units 1 & 2), ALAB-143, 6 AEC 623 (1973), Applicant brings the following information to your attention. In April 1981 during a refueling outage, two dents were made in structural members of the 125 ton (

overhead crane, which is the crane which would be used to carry out the proposed rack replacement operation. The dents were formed when the crane operator inadvertently raised the six ton reactor vessel head insulation (a'very

. tall load) too high, causing the associated lifting fixture to hit the two overhead horizontal fabricated box girders.

The contact left dents about 1-1/4 and 2-3/4 inches deep in the bottom inside corners of the 6 ft. 4-1/4 in. thick fabri-cated box girders. There was no loss of load, and after a thorough inspection the crane was used for the remainder of the refueling outage. The Dresden spent fuel pools were not involved'in any way. The incident was reported to the NRC resident inspector but it was not deemed significant enough to be reportable in a formal Licensee Event Report.

Last week after further investigation by Sergeant &

Lundy, the architect-engineer for the plant, it was determined that the dents may require repair. Accordingly, the Station pSo3 S

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August 3, 1981 ,

Page Two informed the NRC resident inspector that it will not use the crane to carry any loads greater than one-half the rated capacity of the crane (that-is, greater than about 60 tons) or to carry irradiated fuel in the spent fuel cask (about 33 tons), until further evaluation or repairs are made.

This temporary, voluntary de-rating would not preclude use of the crane to. carry. light loads luch as the spent fuel racks, which weigh at most 18,000 pounds or 9 tons. (See

" Testimony (Affidavit) of Scott C. Pedigo Related to Control of Heavy Loads at Dresden Nuclear Power Station," dated May .4, 1981.)

Although maintenance problems are usually not thought to be of interest to NRC Licensing Boards, this incident is being brought to your attention because it involves the overhead crane, which was discussed in testimony in this proceeding in connection with Intervenor's Contention 6 (Accidents) and Board Question 2 (Unresolved Safety Issues :

Control of Heavy Loads Near Spent Fuel).

Resh itted, f /

YV Philip S eptoe PPS/kb CC: Service List ~,

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