ML20086C639

Interim Deficiency Rept Re Damage on RHR 11 at Const Site. Initially Reported on 730502.Caused by Hook Being Lowered Too Fast & Load Cable End Fastening Device Disengaging

ML20086C639
Person / Time
Site:	Salem
Issue date:	05/25/1973
From:	Betz J Public Service Enterprise Group
To:	Kruesi F US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086C637	List: ML20086C639
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8311290049
Download: ML20086C639 (2)

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= John F. Betz Pubhc Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/622-7000 -

vice-Pre udeni in Charge of Electne Operation May 25, 1973 U.S. Atomic Energy Commission Director of Regulatory Operations 7920 Norfolk Avenue Bethesda, Maryland 20014 Attention of Mr. Frank E. Kruesi Director Gentlemen:

NO. 11 RESIDUAL HEAT REMOVAL HEAT EXCHANGER CONSTRUCTION SITE INFLICTED DAMAGE SALEM NUCLEAR GENERATING STATION On May 2, 1973 we reported to the Director' ate of Regulatory Operations, Region 1 that No. 11 Residual Heat-Removal (RHR) Heat Exchanger for No. 1 Unit at Salem Nuclear Generating Station was damaged by a falling crane load block.-

This report is in accordance.with 10CFR50.55(e).

The. incident occurred while the construction forces were preparing to lift No. .ll RHR Heat Exchanger from the truck-bed, which hadJtransported'it from-the laydern ' storage area to the Auxiliary Building Roof in. preparation for installation. The lift was to have been made by a, truck-type crane located on the roof of the Auxiliary. Building at elevation 140'. The crane hook-could not' reach the. heat.

exchanger located at about elevation:100' and was to1have been augmented by the use of 20-foot chokers. The~ crane' operator could not see the~ heat exchangerLdirectly and-was directed by.a signalman.

It appears that the hook;had been lowered tool fast and'in the process of braking at.or near:the end offits travel cau aed the load cable'- end fastening device to .become Ldisengaged, which permitted the load block to fall _the remaining' distance.

.The' block which_ weighed.1,075 pounds struck the. midpoint'of.

the heat exchanger shell and_inflicte'd'a dentLapproximately-

-10' inches in diameter'and 3/4, inch deep. This' crane had been- "'

inspected as part of the routine: site construction-inspection Program. ,g/ f' y .

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v ps U.S. Atomic Energy 5-25-73 Commission The damaged heat exchanger has been returned to the manufacturer for opening, inspection and repair. Pro-cedures will be developed for the repair of the unit when the shell is removed, the tube section is inspected and full assessment of the damage is made. Repairs will be performed in accordance with applicable codes and approved procedures as necessary to restore this equipment to its original quality level. A final report will be prepared on completion of the repair work.

To assure that every precaution is taken when handling safety-related equipment, the responsible supervisor in charge will verify that the prerequisite requirements immediately prior to any lift have been satisfied and that these requirements prevail throughout the actual lifting operation. These shall include but not be limited to:

the use of thoroughly experienced crane operator and guide personnel; in addition to normally scheduled inspections, make a visual inspection of all handling equipment to be used; and assure himself that the hoist operator is fully aware of the equipment limitations which are posted on the equipment.

If you have any other questions prior to our final report of this incident, please feel free to call us.

Ve ry truly yours ,

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