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)

Text

. -.

4

' [p* Mu%'o.,

UNITED STATES f

g NUCLEAR REGULATORY COMMISSION -

r,.

-j WASHINGTON, D. C 20555 0,

ee

\\.....**p

.t October 111', 1990 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

'r Shippingport, Pennsylvania 15007

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 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,-

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

will provide an acceptable level of quality.and safety, and t1at,A11oy 690 has l

superior anti-corrosion properties and similar mechanical properti's to Alloy e

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

+

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

}.

301:

g ;, % V S 4 9010230049 901011

\\

i o

PDR ADOCK 05000334 a

l.

P PNV

i 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

/

Jo ri'N Stolz, Director Pr ject Directorate-I vision of' Reactor Projects:.1/II; v

-i; Office of Nuclear Reactor Regulation cc: See next page 4

)

. i l

i l

s 1

I i

~ '

October 1.1, 1990.

Mr. J. D. Sieber :

?

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, l

t l

Sincerely, l

original! signed by

(

l

. John F. Stolz, Director--

E Project Directorate-I-4 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation.

I cc: See next page i

$$. DISTRIBUTION Docket. Viie M NRC & L3Bs1*PDRs l

Plant File S. Varga (14E4)

B. Boger (14A2)

S. Norris A. DeAgazio i

OGC E. Jordan (HilBB 3302) 4 ACRS(10)

E.Wenzinger(RegionI)

=!

C Y. Cheng 1

I r

l 1

JS&-:x-ECMB M P dD.I-4:LA PDI-4:P PD 0

S AoeAgaz4o:dr CYCheng C

i

/

0

/dio/90 jo/p/90 g/p/90 fe//d/.90

[77604 APPROVAL]

lh i

's-

i 1

1 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 Nelson Tonet, Manager Harrisburg, Pennsylvania.

Post Office Box 2063

(

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

l i

- i

J ij t

/

a