ML20006B709

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Responds to NRC Bulletin 89-002 Re Check Valve Bolting Insp. All Anchor-Darling Model S35OW Check Valves Inspected for Cracked Internal Bolting During Refueling Outage of Unit.No Indications of Cracks Found
ML20006B709
Person / Time
Site: Point Beach NextEra Energy icon.png
Issue date: 01/25/1990
From: Fay C
WISCONSIN ELECTRIC POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-008, CON-NRC-8 IEB-89-200, VPNPD-90-039, VPNPD-90-39, NUDOCS 9002050277
Download: ML20006B709 (2)


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. Wosconson Electnc POWER COMPANY 231 W Mchryn Po. Box 2046. Mawoukee WI 53201 (414)221 2345 4

VPNPD-90-039 10 CFR 50.59(f)

NRC-008 January 25, 1990 U. S. NOCLEAR REGULATORY COMMISSION Document Control-Desk Mail Station P1-137 Washington, D. c. 20555 Gentlemen:

DOCKET 50-301 BULLETIN 89-02 RESPONSE CHECK VALVE BOLTING INSPECTION POINT BEACH NUCLEAR PLANT. UNIT 2 As required by NRC Bulletin 89-02, all Anchor-Darling Model S350W check valves were inspected for cracked internal-bolting during.

the most recent refueling outage of Point Beach Nuclear Plant,'

-Unit 2. Results of the inspections are given below.

2SI-842 A and B Safety Iniection' Accumulator Discharae' Check Valves-The four studs were visually inspected.. No1 indications'of cracks were=foiand. Hardness of the: studs ranged from'Rc20 to-27.

SI-867 A and B-Cold Leo Safety _Iniection Check Valbes-A detailed visual inspecti$n of'the studs was not performed' because of the significant radiation dose. expected during the-necessary cleaning. _A qualitative " ring" test-(striking the-studs with a han.mer) was performed; Land-there was no: indication of discontinuity.within the. studs. -Hardness'of theistuds' ranged-from'Rc19 to 21.

A surface. exam of the studs was"not performed because we do.not:

intend to~ reuse the studs and because of the difficulty'and i exposure associated with cleaning'the studs to a: condition to --i obtain aimeaningful liquid penetrant exam. '

9002050277 900125 D PDR ADOCK 05000301

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l NRC Document Control Desk l January 25, 1990 i Page 2 ,

l Since Anchor-Darling now recommends using studs made from t ASTM A-564 Type.630, new studs of this material were obtained i from Anchor-Darling and installed in each of the valves. l t

since'no cracks were detected and stud hardness was generally below the Rc26 threshold of concern for stress corrosion cracking, we concluded that the operability of these valves was -

not adversely affected during the time the original studs were  !

installed. .

l Inspection of the same valves in Unit 1 is planned for the next refueling outage in April-May 1990.. The condition of those studs ,

will be reported when inspection results are available. .

Very truly yours, e

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C. W. Fay Vice President l Nuclear Power ,

Copies to NRC Regional Administrator, Region III t NRC Resident Inspector Subscribed'and sworn to before me -

this.2M day of heavy , 1990.  ;

Notary Public, State of Wisconsin My Commission expires 3~- 2 7 - 7 0 ,

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