ML19331C990
| ML19331C990 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 07/02/1980 |
| From: | Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-80-08, IEB-80-8, P-80205, NUDOCS 8008270026 | |
| Download: ML19331C990 (2) | |
Text
i s a bec to DAC:ADM:
CENTRAL FILES PDR:HQ Public service company of ce tPDR g
16805 Rd. 19 1/2, Platteville, Colorado IE NSIC L
July 2, 1980 Fort St. Vrain Unit No. 1
.P-80205 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Comission Region IV Office of Inspection and Enforcement
__ 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76102
Subject:
Examination of Containment Liner Penetration Welds Docket No. 50-267
Reference:
Dear Mr. Seyfrit:
PSC6 has conducted an investigation of the Fort St. Vrain penetration connections and has determined that the flued head design as well as designs illustrated in Figure NE 1120-1 of Section III, Winter Addenda 1975 are incorporated in various penetrations assemblies at our facility.
Due to the nature of the primary and secondary containment design of Fort St. Vrain the majority of the flued head design connections are located on the steam generator primary closure where the feedwater; main steam and reheat steam tubes pass through the closure to the steam generator located inside containment.
In addition, the Helium Purification System wells and ffiter adsorber penetration, several instrument penetrations, the safety relief valve penetration and the Helium Circulator primary closure have connections of the type shown in Figure NE 1120-1.
The PCRV penetrations liners are designed and fabricated in accordance with ASME Section III, Class A Vessels, 1965, with addenda up to and including Winter 1966, which required radiography of all classes of butt-weld joints.- The Fort St. Vrain specifications for the PCRV penetration liners requires full radiography with ultrasonic inspection permitted only upon determination by the buyer that radiography is not pracitical. Our investigation has shown that all Class A full penetration butt-welds have been fully radiograph and in no case was U.T. substituted for radiography.
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Mr. Karl V. Seyfrit Page 2 of 2
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July 2, 1980 In most cases, it was found that either ultrasonic, magnetic particle or liquid penetrant or all three, were perfonned in addition to radiography.
Extensive N.D.E. was performed due to the anticipated inaccessibility of these welds during operation.
The welds in question are full penetration butt-welds and nozzle welds ranging in size as follows:
PENETRATION FLUED HEAD OR CONTAINMENT SIZE Steam Generator Tubes 1" 0.D. Tubing Steam Generator Reheat Pipe 16" 0.D. Pipe Bottom Head Access Liner 74" 0.D.
He Circulator Access Liner 54" 0.D.
Safety Relief Va.lve -
8" 0:D. -
Dew Point Moisture Monitor 1/4" 0.D. Tubing The materials us'ed in predominately carbon' steel, chrome' steel and inconel.
PSCo is not able to determine if backing rings were left in place after welding, however, we are of the opinion that this item need not be identified since all the full pressurewelds were radiographed.
PSCo is
.... -:.... unable' to det' rmine the extent, 'tf'any, -6fiwel'd repair"reqdired' on welds' ^ ' ~
e
.of the t' pe, described in the. Bulletin-in that the records contain only..
y final product weTd data.
Thh'inve'st'ihatf5n'of tsi mkjority of"p nhtrition[Iridicateir,Eh'a[ '
full r,adiography was performed on the containment liner penetra, tion butt-welds in accordance with ASME B & PV requ'ireinent in effect at the time and that ultrasonic and surface inspections were not used in lieu of radiography at Fort St. Vrain.
The requirements set forth in I E-
- Bulletin 80-08.have'been fdlfilled and no fur ~ther actionis required.
Please. refer any questions regarding this matter to this office.
' Very truly yours, y
M I42ur Frederick E. Swart Nuclear Project Manager Nuclear Project Department FES/TCP/vw
.