ML20055J203

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Responds to NRC Bulletin 89-002 Re Insp of safety-related Anchor/Darling Model S350W Check Valves Supplied w/A193 Grade B6 Type 410 SS Retaining Block Studs.Studs Visually Inspected & No Cracks Found
ML20055J203
Person / Time
Site: Point Beach NextEra Energy icon.png
Issue date: 07/25/1990
From: Fay C
WISCONSIN ELECTRIC POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-90-077, CON-NRC-90-77 IEB-89-002, IEB-89-2, VPNPD-90-344, NUDOCS 9008010194
Download: ML20055J203 (2)


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Electnc POWER COMPANY 231'W M6chgon, PO Box 2046. MM:Mee, WI 53201 ' (414)221,2345 j VPNPD-90-344 NRC-90-077 jl

' July 25,:1990 .)

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U.S. NUCLEAR REGULATORY COMMISSION-Document Control Desk-Mail Station ~ P1-137 3 i

Washington,_D.C. 20555 , {

Gentlemen:

1 DOCKET NO. 50-266 )

BULLETIN 89-02 RESPONSE I CHECK VALVE INSPECTION POINT BEACH NUCLEAR PLANT, UNIT 1 NRC Bulletin 89-02' requires that licensees-disassemble:and inspect safety-related Anchor / Darling Model S350W check valves supplied-with A193 Grade B6 Type 410 SS retaining block studs. Four of-

-these va3ves'are installed in each unit at Point Beach Nuclear '

' Plant. Tne retaining block studs from the. Unit 2 valves were inspected following the Fall 1989 Unit'2; refueling outage. No-cracked' studs were found.- This was reported;to the NRC in our letter dated' January 25,s1990. *V The Unit i valves were inspecte'd during the Spring 1990 refueling

  • outage.- -The~ studs..were visually inspected;and no cracks were-found. ' Hardness. testing ~results ranged from less than Rc 20 to i Rc 32.-

Bulletin 89-02 also required. licensees to. review other; safety-related check valves.to-determine.if similar designs and materials-are used. Seven similar safety-related' valves'and 1.important-(but ,

not safety-related) valve were identified in each unit. The internal bolting from.the Unit 1. valves.was visually inspected and no cracks were found. Hardness ranged from Rc 27:to RC-47.

Inspection of the corresponding valves in Unit 2 isl planned for.the next refueling outage in October-November 1990. '

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NRC Document Control: Desk July.25, 1990' Page:2' -

i When-the Unit,1 valves were reassembled,.-the original internal ~ I bolting was replaced with bolting made from ASTM A-564 Type:630-stainlass steel. This material is' recommended-by Anchor / Darling-and.EPRI,:and.will: alleviate future concerns involving stress-corrosion cracking. .!

Since no cracked bolting was found, we' concluded that the.

operability of these valves was,not-adversely affected during the ,

time the original bolting was-installed.. i

-Very truly yours, wto C. . Fay.  ;

Vice President  ;

Nuclear Power

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Copies-to NRC Regional Administratcr, Region III j NRC Resident Inspector ,

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