A08184, Suppls 901221 Response to NRC Bulletin 89-002 Re Stress Corrosion Cracking in Stainless Steel Internal Preloaded Bolting in Anchor/Darling Swing Check Valves.Valve 2-SI-008 Will Be Inspected by Next Outage Scheduled in Apr 1992

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Suppls 901221 Response to NRC Bulletin 89-002 Re Stress Corrosion Cracking in Stainless Steel Internal Preloaded Bolting in Anchor/Darling Swing Check Valves.Valve 2-SI-008 Will Be Inspected by Next Outage Scheduled in Apr 1992
ML20067D007
Person / Time
Site: Millstone Dominion icon.png
Issue date: 02/06/1991
From: Mroczka E
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
A08184, A8184, IEB-89-002, IEB-89-2, NUDOCS 9102120289
Download: ML20067D007 (2)


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HARTFORD CONNECTICUT 061410270 k k 1J C .7%(([ (203) 665-5000 February 6, 1991 Docket No. 50-336 A08184 Re: NRC Bulletin 89-02 U.S. Nuclear Regulctory Commission Attn:- Document Contral Desk Washington, DC 2055's Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 NRC Bulletin 89-02

" Stress Corrosion Cracking of High-Hardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model S350W Swing Check Valves or Valves of Similar Desian" In a letter dated December 21,1990,(I) Northeast Nuclear Energy Company  ;

(NNECO) submitted a partial response to NRC Bulletin -(NRCB) 89-02 for Millstone Unit No. 2, containing inspection results for all but four of the

! - check valves affected by the Bulletin request.

'During December 1990 and -January 1991, NNECO inspected three valves

'(2-RW-4A, 2-RW-4B, and 2-RW-8) in the spent fuel pnol cooling system. Also as planned, NNECO: replaced the . retaining block bolts with bolts of less g susceptible material (type 304 stainless- steel). The old bolts showed no ,

evidence of cracking. - As requested by NRCB 89-02, we .are maintaining documentation of these inspections.

The single renining valve will 'be inspected not later than the next refueling outage (scheduled to begin in April 1992). This valve (2-SI-008) is -the High Pressure Safety Injection "A" Header Check Valve. As required by NRCB 89-02, the results will be reported within 60 days of completing L -the inspection.

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(1) E. J. Mroczka letter to USNRC, " Response to NRC Bulletin 89-02 for Hillstone Nuclear Power Station, Unit No. 2," dated December 21, 1990.

9102120289 910206 PDR ADOCK 05000336 0 PDR OSM72 FIEV 4 88 j 1Wea y

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. h.S.: Nuclear Regulatory Commission i

.- A08184/Page 2' february 6, 1991; j

. Please contact us if you have any ~questions.

L Very truly yours, NORTHEAST NUCLEAR ENERGY. COMPANY a E. K )tt'oczka (/

Seniof Vice President--

cc: W. T. Russell, Region l' Administrator . -

-G. S. Vissing, NRC Proposed Manager, Millstone Unit No. 2 W. J. Raymond, Senior Resident Inspector, Millstone Unit Nos.1, 2, and 3

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Then- personally 1 appeared before me, E. J. Mroczka, who1 being iduly sworn,-

did state 'that he ,is Senior Vice President of Northeast . Nuclear Energy Company, a Licensee herein,1that he is authorized to execute.and file the-foregoing information-in the name and on behr.lf of-the Licensee herein,.and-- .

that,ther statements contained in said-information are true -and correct io the best--of- his knowledge and belief.-

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