ML20058K838
| ML20058K838 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/02/1976 |
| From: | Wachter L NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-76-04, IEB-76-4, NUDOCS 9104240472 | |
| Download: ML20058K838 (2) | |
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NSD8 NORTHERN STATES POWER COMPANY M I N N E A PO LI G. M I N N E S OTA 55400 June 2, 1976 Mr. James C. Keppler
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Director - F4gion III l
Office of Inspection and Enforecuent
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United States Nuclear Eegulatory Ccanission j
799 Prosevait Road
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Clen Ellyn, Illinois 60137 Dear Mr. Keppler
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M0!TTICELLO KUCLEAR CENERATINC PLANT Dociet No. 50-263 License t'o. DFE-22 The fc11cving materici is subcitted in response to IE Eulletin 30. 7 f-04 "Crscks in Cold orkrd Piping at I'.'P's."
A survey has been performed to develop the specific listing of stainicas steel piping as deficed in 1.s of the bulletin. The piping eurveyed in thet greater than tvo inches nominal sfac, czpoced to reactor coolant pressure during orerr. tion, and inside the secend icolction valve of the reacter coolant systen.
Because doeveentation require ents at the time the ventietilo Fleet ves conetructed were not as coepletely for r.sif acd se they cre tef y, the task of verifying the solution ennenlieg of cold voricd esterir.1 har required considerable effort. The specific listing has been rrcpared ar,i developed to include, in each case, the purchase order, ennufacturer, material and purchase specificetion. and heat number.
In teost cases, howcVer it has been necerrary to request specific documentetion frem the supplier or us.nuf acturer to verify solution annealing. The specifications do require the process in e.11 instances, but documentetton f r. not =recific enough to conclude that the annealicg was done. Completion of ths solution amnesling verificatien ie centicuing.
It is anticiptted that the work will be conpleted by August,1976.-
The protram now in pronrcss will identify any cold vorted sustenitie stainless steel which ney not bave been solution act etic 3.
Adverse ficlings vill be reported to the FEC Fegfotel Office within ?& heurt es requested.
Indiff Juni considerttion vill 1e ifven to emy meterial identifie.d as r.ot havict had proper seneeling to dt:termine if the crproprieta ection should 9f04240472 760602-CF ADDCK 05000263 CF-
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w Mr. James C. Keppler June 2, 1976 ba one of increase'd "in service" inspeetion, repiteceent of the material, or other nors appropriato action.
If replacescnt is determined to be required, it vould be pisnned for the earliest scheduled refunling shutdown when new v.atarial and proper replacceent procedure.s could be made available.
In the time period prior to completion of this request end any appropriata actica, the existian Icak detection r.ethods ar.3 czisting Technical Stabification limits on prinary system Icakage (TS 3.6/4.0) vill provide adequate protection against any uudetected f ailure.
Yours very truly, L. J.
lachter Vice Frcsident - Power Production and Systenu operstion ect Mr. Victor Stello Mr. C. Charncif Hinnesota rollution Control A ency t
Attention:
Mr. J. '.l. Tcrnan M C Office of Incpectien end Enforcerent L'ashington, II.C.
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