ML20077L507
| ML20077L507 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/06/1991 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML19302F012 | List: |
| References | |
| IEB-89-001, IEB-89-1, NUDOCS 9108120298 | |
| Download: ML20077L507 (2) | |
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PROPR M 4
1 9f l'Jnuee Va%y Aut*tooty 1101 Ma4eit Sueet ChananoogA hyveue 37432 i l 4
AUG 061991 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of the Application of
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Docket Nos. 50-327 Tennessee Valler Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - NRC B'JLLETIN 89-01, SUPPLEMENT 2 - FAILURE OF WESTINGHOUSE ELECTRIC CORP 0 RATION STEAM CENERATOR (SG) TUBE MECRANICAL PLUGS This letter providos SQN's response to NRC Bulletin 89-01, Supplement 2, regarding the f ailure of Westinghouse SG tube mechanical plugs fabricated from the thermally treated Inconel 600 (1-600).
As identifled in Enclosures 1 through 3 TVA has been systematically removing all of Westinghouse I-600 SG tube plugs from service and replacing them with Inconel 690 tube plugs. To date, all 1-600 plugs have been removed from Unit 2, whereas 79 of 126 have been removed from Unit 1.
Of the remaining 47 I-600 plugs in Unit 1, only 10 are installed in hot legs.
These 10 are irom heat NX-5222 and are installed in SG No. 1.
A justification for continued operation fcr thcae 10 hot leg plugs was 1
previously submitted on September 17, 1990. The balance of the plugs
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(37) is in the cold legs and does not require corrective actions until the year 2009 or later..1n keeping with TVA's conservative and proactive philosophy, however, we are making every effort to remove all of the I-600 plugs at the earliest possible time.
PROM!ET/ RY liJ0PP.ATCN ATTACHED.
WH&4 SEP/- ATED. Tid: PME B S
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3 U.S. Nuclear Regulatory Commission AUG 00199i Enclosures 1 and 2 provido the responsco for Units 1 and 2, respectively, J
for each action requested by the supplement.
Enclosuro 3 provides the latest data for the SQN plugs. providos an additional i
commitment to remove the 10 hot leg plugs previously discussed during the Unit 1 Cycle 5 refueling outage. is propelotary to Westinghouso.
An " Application for Withholding Propeletary Information from Public Disclosuro" and an accompanying Af fidavit ( AW-91-167) were submitted by Woctinghouse in a May 31, 1991, letter to the NRC, (Attention: J. E. Richardson, Director, Division of Engineering & System Technology) in accordance with 10 CFR Section 2.790.
This request was made regarding WCAP-12244, Revision 3 Addendum 2, from which the noted enclosure was taken.
Therefore, it is requested that the noted enclosure be handled in accordance with the May 31, 1991, application for withholding and the accompanying affidavit.
If there are any questions concerning thic issue, please telephone S. D. Gilley at (615) 751-7667.
Very truly yours.
TENNESSEE VALLEt AUTHORITY l
'n p.L
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}h E. C. Whl lace, Matager Nuclear Licensing and Regulatory Affairs i
Enclosures L
cc (Enclosures):
Mr. D. E. LaBargo, Project Manager U.S. Nucicar Regulatory Commission
.One White Flint, North 11555 Rockvillo Piko l
Rockville, Maryland 20852-NRC Resident Inspector Sequoyah Nuclose Plant 2600 Igou Perry Road Soddy Daisy, Tennescoo 37379 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commissi>n-Reg'r. II 101 Marietta Street, NW, Butte 2900 Atlanta, Georgia 30323
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