ML20062A696

Responds to Util 900907 Request for Authorization to Use Alloy 690 for Steam Generator Tube Plugs.Use of Alloy 690 Acceptable

ML20062A696
Person / Time
Site:	Beaver Valley
Issue date:	10/11/1990
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Sieber J DUQUESNE LIGHT CO.
References
BV-90-016, BV-90-16, IEB-89-001, IEB-89-1, TAC-77604, TAC-77605, NUDOCS 9010230049
Download: ML20062A696 (4)

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' [p*'*Mu%'o., UNITED STATES f g NUCLEAR REGULATORY COMMISSION -

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-j ee WASHINGTON, D. C 20555

\.....**p October 111', 1990

.t Dockets Nos. 50-334 1 and 50-412 l Serial No. BV-90-016 ,

Mr. J. D. Sieber, Vice President Nuclear Group Duquesne Light Company t P. O. Box 4 Shippingport, Pennsylvania 15007

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SUBJECT:

BEAVER VALLEY POWER STATION, UNITS 1 AND 2:-AUTHORIZATION T0.USE' <

ALLOY 690 FOR STEM GENERATOR TUBE PLUGS (TAC NOS. 77604 AND 77605);

By letter dated September 7,1990, Duquesne Light Company (DLC) requested ,

i approval,pursuantto10CFR50.55a(g)(3),fortheuseof.steamgeneratortube-plugs fabricated of nickel-chromium-iron UNS:N-06690 material-(Alloy 690) at the Beaver Valley Power Station, Units-1 and 2. The: alloy would be used for ~  ;

both mechanical and welded applications in accordance with the requirements of the ASME Boiler and Pressure Vessel Code as an alternativeuto-A11oy 600; YourrequestreferencedCodeCaseN-474-1-(ApprovedMarch5,1990)ofth'eASME Boiler and Pressure Vessel Code. This code case addresses' Alloy 690.and-- 1 authorizes its use in Other forms for the construction-of Section III,- 1 Division 1,. Class 1 components. A11oy 690 is specified in ASME Section II,-

material specifications SB-163, SB-167, SB-168,' and SB-166. JA11oy 690 in  !

tubing form (SB-163) was authorized previously for Class 1 components. -The use of Alloy 690 was endorsed by the NRC in Bulletin 89-01,' Failure of ,

Westinghouse Steam Generator Tube Mechanical Plugs, dated May 15, 1989. 1 The DLC request asserts that the use of Alloy 690 for thelpro>osed-application l l

will provide an acceptable level of quality.and safety, and t1at,A11oy 690 has superior anti-corrosion properties and similar mechanical properti's e to Alloy 600 used previously for this application. -Furthermore, the; design Stress -

Intensity stipulated by the Code Case and used in the' design and qualification.

of thel plugs is the same~for both Alloy 690 and Alloy 600.of the same form.

In accordance with the provisions ~of Footnote 6 to 10 CFR 50'.55a,.we'may, authorize the use of Code Case N474-1 for app.lications not precluded by; regulatory or other requirements'or Regulatory Guide recommendations.' We have reviewed your request and supporting = material. We conclude:that the'use; of Alloy 690 as an alternative to Alloy 600 will provide an ' acceptable level '

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of safety and-quality. .Therefore, its use for steam generator tube p'ugsiis- ,

authorized under the provisions of 10 CFR 50.55a(a)(3). DLC is cautitned, l  ;

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.. . t Mr. J. D. Sieber -2 October 11, 1990 however, to ascertain that no regulatory requirements ~ are violated, and that there are no conflicts with other recomended limitations -resulting from usage-of this code case.

Sincerely, _. j zD / -

l Jo ri'N Stolz, Director  !

Pr ject Directorate-I v vision of' Reactor Projects: .1/II; -i; Office of Nuclear Reactor Regulation cc: See next page 1

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.. . . l October 1.1, 1990.

Mr. J. D. Sieber 1 1

, however, to ascertain that no regulatory requirements are violated,'and that  ?

l there are no conflicts with other recommended limitations _resulting from usage l- of this code case, ,

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Sincerely, l original! signed by

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l E . John F. Stolz, Director-- .

Project Directorate-I-4 .  !

Division of Reactor Projects - I/II -

Office of Nuclear Reactor Regulation.

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[77604 APPROVAL]

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.,.. j Mr. J. Sieber Beaver Valley Power Station Duquesne Light Company Units 1 & 2 CC: -i Jay E. Silberg, Esquire Bureau of- Radiation Protection 4

Shaw, Pittman, Potts and Trowbridge Pennsylvania Department of 2300 N Street, N.W. Environmental Resources Washington, DC 20037 ATTN: R. Janati Post Office Box 2063  !

Nelson Tonet, Manager Harrisburg, Pennsylvania .17120 (

Nuclear Safety- '.  ;

Ouquesne Light Company Mayor of the Borrough of P. O. Box 4 Shippingport Shippingport, Pennsylvania 15077 Post Office Box 3 Shippingport, Pennsylvania 15077~

Commissioner Roy M. Smith Regional Administrator; Region _I l West Virginia ~ Department of Labor U.S. Nuclear Regulatory Connission .

Building 3, Room 319 475 Allendale Road 1

Capitol Complex King of. Prussia, Pennsylvania 19406' Charleston, WV 25305 i

John D. Borrows Resident Inspector Director, Utilities Department.- .

U.S. Nuclear- Regulatory Connission Public Utilities Connission Post Office Box 181 180 East Broad Street Shippingport, Pennsylvania -15077-Columbus,-Ohio 43266-0573 Director, Pennsylvania Emergency Nanagement Agency Post Office Box 3321 '

Harrisburg, Pennsylvania ' 17105-3321 1

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