ML20083D638

Forwards Response to Section 5.1.1(4) of NUREG-0612, Control of Heavy Loads of Nuclear Power Plants, Consisting of Test Results of Missile Shield Lifting Harness Per DG Eisenhut

ML20083D638
Person / Time
Site:	Davis Besse
Issue date:	12/16/1983
From:	Crouse R TOLEDO EDISON CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
REF-GTECI-A-36, REF-GTECI-SF, RTR-NUREG-0612, RTR-NUREG-612, TASK-A-36, TASK-OR 1001, TAC-10993, NUDOCS 8312280177
Download: ML20083D638 (5)

Text

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TOLEDO

%ms E eISON FbcHARO P. Cnoust v n.oe .t Docket No. 50-346 License No. NPF-3 Serial No. 1001 December 16, 1983 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz Operating Reactor Branch No. 4 Division of Operating Reactors United States Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Stolz:

This is in response to Mr. D. G. Eisenhut's letter dated December 22, 1980 (Log No. 648) concerning " Control of Heavy Loads at Nuclear Power Plants" NUREG-0612. Attached is Toledo Edison's response to Section 5.1.1(4) for the Missile Shield Lifting Harness. The Lifting Harness was evaluated against ANSI N14.6-1978 and the results are contained in the attachment for the Davis-Besse Nuclear Power Station Unit No. 1.

Very truly yours, RPC: GAB:lah attachment cc: DB-1 NRC Resident Inspector k

< , i 8312280177 831216 PDR ADOCK 05000 P

THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652

___ - - _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -_ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ __ J

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STRUCTURAL EVALUATION OF Tif MISSILE SHIELD LIFTING HARIESS On May 2 and 6,1983, the Toledo Edison Company provided responses to open  ;

Items concerning the Control of Heavy Loads at Nuclear Power Plants

{

(NUREG-0612) which were identified in Technical Evoluotion Reports (TER) transmitted by the NRC on September 23,1982 and October 6,1983. In our May 2 submittal, we indicated that the missile shield lif ting harness could not be evaluated at that time because certain physical information was required and the device was inaccessible during power operation. in August, during our scheduled refueling outoge we were able to obtain the necessary information. Accordingly, we have completed the structural evaluation. The results of our evaluation are summarized in Table 1.

The missile shield lifting harness is composed of three principal parts: side plates, pins, and slings /opurtenances (sketch attached). The missile shields are each lifted at six points by slings which are looped around two 3-inch diameter pins within the device (three slings to each pin). A third, 6k-inch diameter pin serves os the pick point for the polar crane hook. The load is distributed from each of the smaller pins to the larger pin through two 1-inch side plates which are spaced opproximately 10 inches oport by two internal spreader plates. The l-inch side plates have on equilateral triangular geometry with approximately 25-inch principal dimensions.

The design criteria documented in ANSI N14.6-1978 specify that the factor of safety for yield strength and ultimate strength be greater than or equal to 3 and' 5, respectively. All ports of the missile shield lifting horness have been found to meet these criterio with the exception of two 3-inch diameter pins and a portion of the 1-inch side plates in the vicinity of these pins. The pins will be replaced

! with a material having higher strength properties so that the ANSI NI4.6-1978 strength requirements are met. We are currently addressing this with potential suppliers.

I

t, The I-inch side plates meet the ANSI N14.6-1978 yield strength criterion; however, Just miss the ultimate strength criterion by 3.4 percent (i.e., factor of safety 4.83 versus 5.0) for combined bending and tension, in physical terms, the computed stresses leading to the 4.83 factor of safety are local and expected to be redistributed within the plate. Due to conservatism in the analysis and the small deviation frorn the acceptonce criterio, we feel no modification of the missile shield lifting horness side plates is required, in summary, we find that the modified missile shield lif ting horness will meet the intent of ANSI N14.6-1978.

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TABLE 1

SUMMARY

OF FACTORS OF SAFETY MISSILE SHIELD LIFTING HARNESS FACTOR OF SAFETY

• AGAINST AGAINST YlELD ULTlHATE YlELD ULTIMATE STRENGTH STRENGTH MATERIAL ITEM _

30,000 psi 60,000 psi C-1018 6&" Diameter Pin 8 37 16.75 34.38 68.76

- Shear

- Bending 30,000 psi 60,000 psi C-1018 3" Diameter Pin 3.52 7 04 1.43 2.87

- Shear

- Bending 36,000 psi 58,000 psi A-36 1" Plate 4.84 7.80

- 6&" Pin 5 74 9 24

- Tear Out

- Tension 4.59 7.39

- 3" Pin 6.20 10.00

- Tear Out 3.00 4.83

- Tension

- Tension & Bending IWRC 1&" Cable 511ngs 6.37 55.5 Tons

- Tension 6.14 53.5 Tons 14" Turnbuckles 9.75 85.0 Tons 11" Shackles 3.0 5.0 ALLOWABLE FACTOR OF SAFETY

• Based upon 101% of static load

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