B10970, Potential Significant Deficiency Rept SD-46 Re Broken & Cracked Tangs on Capstan Springs Used on Pacific Scientific Size 1 & 3 Mechanical Snubbers.Initially Reported on 831018. All Affected Snubbers Will Be Returned to Vendor for Insp

Potential Significant Deficiency Rept SD-46 Re Broken & Cracked Tangs on Capstan Springs Used on Pacific Scientific Size 1 & 3 Mechanical Snubbers.Initially Reported on 831018. All Affected Snubbers Will Be Returned to Vendor for Insp

ML20083A232
Person / Time
Site:	Millstone
Issue date:	12/06/1983
From:	Counsil W NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
B10970, SD-46, NUDOCS 8312200220
Download: ML20083A232 (2)

Text

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NORT9 EAST tmLMES Gwal OHiceo Seien Strat Bedin. Connecticut P.O. BOX 270

. ..v .;. co.. H ARTFORD. CONNECTICUT 06141-0270 g g g ww asv inna ssac cow- (203) 666-6911 EuO.Ma&T esgCLlan EstaGy coupp December 6,1983 Docket No. 50-423 B10970 l l

l Dr. Thomas E. Murley l Regional Administrator l Region I l U. S. Nuclear Regulatory Commission 1 631 Park Avenue King of Prussia, PA 19406

Dear Dr. Murley:

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction: Potential Defective Springs on Pacific Scientific Mechanical Snubbers (SD-46)

In an October 18, 1983 telephone conversation between your Mr. 3. Robertson and our Mr. R. E. Lefebvre, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the constructic;n of Millstone Unit No. 3 as required by 10CFR50.55(e). The potential significant deficiency involves broken and cracked tangs on capstan springs used on Pacific Scientific size 1 and 3 mechanical snubbers.

Our architect-engineer, Stone & Webster Engineering Corporation, is in the process of identifying the possibly deficient snubbers used in the construction of Millstone Unit No. 3. After all of the affected snubbers have been identified, they will be returned to the vendor for inspection and rebuilding, if necessary.

All snubbers will be recertified with the proper documentation before reuse on the Unit.

Once the results of this inspection become known, NNECO will issue a final report regarding this patential significant deficiency which is expected to be available on or before February 1,1984.

8312200220 831206 PDR ADOCK 05000423 PDR S

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Based on a December 2,1983 telephone conversation between your Mr. 3.

Robertson and our Ms. P. C. Bandzes, this report is being forwarded to you on December 6,1983.

Very truly yours, lib 72 '

W. d.'Counsil Senior Vice President cc Mr. R. C. DeYoung, Director Division of Inspection and Enforcement U. S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue Bethesda, MD 20014

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