ML20077N810
| ML20077N810 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 08/12/1991 |
| From: | Burski R ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, W3F1-91-0458, W3F1-91-458, NUDOCS 9108150112 | |
| Download: ML20077N810 (4) | |
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1 W3 F1 0458 A4.05 QA August 12, 1991 U.S. Nuclear Regulatory Commission ATTN: Document Control Desh Washington, D.C. 20555 Subject :
Waterford 3 SES Docket No. 50-382 License No. NPF-38 NilC Bulletin No. 89-01, Supplement 2:
Failure of Westinghouse Steam Generator Tube Mechanical Plugs Gentlemen:
The purpose of this letter is to provide the Waterford 3 response to actions requested by Supplement 2 of NitC llulletin No. 89-01. Supplement 2 of NltC 11ulletin No. 89-01, was issued on June 28,1991 (and recei*.ed by Waterford 3 on July 11,1991) to request that actions similar to those requested in NHC Bulletin 89-01, " Failure of Westinghouse Steam Generator Tube Mechanical Plugs", be extended to include all Westinghouse mechanical phigs fabricated from thermally treated inconel 600.Bulletin 89-01 was issued on May 15, 1989 and requested that licensees determine whether certain mechanleal plugs supplied by Westinghouse are installed in their steam generators and, if so, that an action plan be implemented to ensure that those plugs continue to provido adequato assurance of reactor coolant pressure boundary integrity under normal operating, transient, and postulated accident conditions. The following information summarizes the status of Waterford 3's actions in response to Bulletin 89-01 and its supplements.
The actions requested by Bulletin 89-01 applied only to plugs fabricated from inconel G00 heats NX-3270, NX-3513, NX-3962, and NX-4523 (referred to as Group 1 heats). The bulletin requested that repairs and/or replacements be accomplished according to a schedule consistent with an algorithm developed by Westinghouse using as a benchmark the most conservative corrosion data from the field. Westinghouse reports WCAP-12244 (proprietary version) and 12245 (non-proprietary version), " Steam Generator Tube Plug Integrity Summary Report",
provided complete listings of plug lifetimes categorized by plant, date of installation, and heat number. Lifetime estimates were listed for all Westinghouse mechanical plugs fabricated from the above listed Group 1 heats as well as plugs fabriented from all other heats of thermally treated Inconel GOO, which were identified as Group 2 heats.
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4 W31'l-91-0158 NitC Ilulletin No. 89-01, Supplement 2:
Failure of Westinghouse Steam Generator Tubo M9ehanical Plugn Pago 2 August-12, 1991 In responso to llulletin 89-01,1,ouisialm Power tuul hight notified the NitC in letter no. W3P89-3058, dated June 22, 1989, timt meeluudeal tube plugs fabrleuted frem Group 1 heats were not installed in the steam generators at Watorford 3.
l.PLh also noted that seventetu Westinghouse mechanicel plugs from Group 2 heats it'ent numbers NX-1989 and NX-5222) were !nstal'cd le the steam generators at waterford 3.
Supplement 1 of Ilulletin 89-01 was issued in November,1990 to update the luformation contained in the original bulletin and to luform licensees that the Westinghouse reports had been updated with revised lifetime estimates and corresponding dates for repair or replacement. Supplement 2 of Ilulletin 89-01 requests that licensees verify the luformation contained in Addendum 2 to llevision 3 of Westinghouso reports WCAP 12'114 and WCAP-12215 for mechanic 4u tubo plugs fabriented from Group 2 heats, and notify the NitC of action plans to implement repair or replacement of affected tube plugs based upon the lifetimo estimates in the Westinghouse reports.
Actions to date include the removal of the six hot leg tube plugs in Waterford 3 nteam generators # 1 and #2 which weru fabricated from Group 2 heats discuaned in Supplement 2 of Ilulletin 89-01. The hot leg tubo plugs woro removed during itefuel 4 (completed May,1991) and replaced with alloy G90 tube plugs.
in addition, a negativo commitment was incorporatoo into Nuclear Operations Engineering and Construction Proceduro NOECP-252, " Steam Generator Eddy-Current Inservlee Testing", to disallow the accoutance of mechanical plugs fabeleated from llent #s 3279, 3513, 39G2, '523 and 5222. This negativo arhmont will be revised to disallow the acceptanco of any mechanical plugs o
faar. ad from thermally treated Inconel GOO, rather than listing the individual heat numbers.
flased on the anovo, thoro are eleven remaining tube plugs currently installed in the cold legs of the Waterford 3 *, team generators which are fabricated from the Group 2 heats. Three tube plugs are installed in the cohl leg of steam generator
- 1 and two tubo plugs are inetalled in the cold leg of steam generator #2, which were fabricated from llent #5222 Also, five tube phtgs are installed in the cohl
'eg of steam generator #1 and one tubo plug is installed in the cold leg of s'eam geneintor #2, whleh were fabricated from llent #1989.
4 W3F1-91-0458 NRC Bulletin No. 89-01, Supplement 2:
Failure of Westinghouse Steam Genera *ar Tubo Mechanical Plugs Page 3 August 12, 1991 In accordance with Westinghouse report WCAP-12245, the remaining lifetime estimates for the mechanical tube plugs in the cold legs of Waterford 3 steam generators indlede that the year to repair or replace is 2007 for lleat # 5222 and 2132 for llent # 198t. These remaining Group 2 heat tubo plugs will be replaced with alloy 690 tube plugs during the next outage that each ludividual steam generator is accessed for eddy current examinations, it is expected that steam generator #1 will t9 accessed during Refuel 5 and steam generator # 2 will be accessed during F
..e1 G, which are presently scheduled for September,1992, and March,1991 ew etively. Iloth refuel outages occur well before the repair
-ased on L atinghouse tube plug estimated lifetimes. In the or replacement eve..;.uut the reniaining Group 2 heat tube plugs cannot be replaced during either Refuel 5 or 6, the affected plugs will be replaced during subsequent outages, prior to the estimated tube plug repair or replacement date.
if there are any questions on this matter, please contact B.R. Loetzerich at (504) 739-GG30.
Very truly yours,
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R.D. Martin, NRC Region IV D.L. Wigginton, NRC-NRR R.D. McGehee N.S. Reynolds NRC Reside Inspectors Office
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION
-In the matter of
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. Entergy Operations, Incorporated
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Docket No. 50-382 Waterford 3 Steam Electric Station
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AFFIDAVIT R.F. Burski, being duly sworn, hereby deposes and says that he is Director Nuclear Safety. - Waterford 3 of Entergy Operations, Incorporated; that he is-duly authorized to sign and file with the Nuclear Regulatory Commission the attached Response to NRC Bulletin No. 89-01, Supplement 2; that he is familiar with the content thereof; and that the matters set forth therein are true and correct to the best of his knowledge, information and belief.
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R.F. Iturdki Director Nuclear Safety - Waterford 3 4
STATE OF LOUISIANA
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)'ss PARISil OF ST. CilARLES
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Subscribed and sworn to before me, a Notary Public in,and for the Parish and State above named this -
o day of CLc 4 r + l~
,1991.
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My Commission expires
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