ML20039G284

Interim Deficiency Rept Re Power-Strut Spring Nuts W/Shallow Depth of Serrations,Initially Reported 811125.Problem Apparently Confined to Specific Lot of Part PS-9227-1/2RS. Nuts Returned to Mfg.Next Rept Will Be Submitted by 820331

ML20039G284
Person / Time
Site:	Nine Mile Point
Issue date:	12/23/1981
From:	Rhode G NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8201150462
Download: ML20039G284 (2)

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kl Y NIAGARA RUMOHAWK NIAGARA MollAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE. N Y.13202/ TELEPHONE (315) 4741511 December 23, 1981 c)

O 4 Office of Inspection and Enforcement y .'N Region I d sN \

Attention: Mr. Richard W. Starostecki, Director  ;' P.2CEtVED Division of Resident and Project Inspection U.S. fiuclear Regulatory Commission L.y

. JANI gg g 631 Park Avenue 5d ,A King of Pru ssia, PA 19406 h "# 7" "

-'3^ a u:tte mm :

f Re: Nine Mile Point Unit 2 4

,W to Docket No. 50-410

Dear Mr. Starostecki:

Enclosea is an interim 30 cay report in accordance wi 10 CFR 50.SS(e) fer the deficiency regarding Power-Strut spring nuts. This condition was reported by telephone to Mr. H. Kister of your staff on November 25, 1981. A final report will be submitted by March 31, 1982.

Very truly yours, NIAGARA MOHAWK POWER CORPORATION W /7 N /

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. W, 4 ." U Gerald K. hode Vice Presi t System Project Management PM:ja Enclo sure 8201150462 811223 PDR ADOCK 05000410 SOg4, S PDR

NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT CNIT 2 DOCKET NO. 50-410 INTERIM REPORT FOR REPGRTABLE DEFICIENCY REGARDING POWER-STRUT SPRING NUTS Description of the Deficiency The potential problem involves Power-Strut spring nuts with shallow depth of serration s. These spring nuts may have lower slip load values in chear a loading (slip along axis of the channel) than oesigned for. By a letter dated November 9,1981 Power-Strut notified the Nuclear Regulatory Commission under 10 CFR 21 of a potential problem regaroing Pcwer-Strut spring nuts.

Power-Strut has indicated that the potential problem has been identified to a specific lot cf par t number PS-9227-1/2RS spring nuts.

Power-Strut has requested we return the 2000 PS-9227-1/2RS spring nuts which hao been oelivereo to the linit 2 construction site. The 2,'.03 spring nut s have since been returned to Power-Strut. The problem is still being investigateo and a final report, including the corrective action to be taken and an analy: sis of implications, will be submitted by March 31, 1982.

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