ML19350B278
| ML19350B278 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 02/27/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8103200207 | |
| Download: ML19350B278 (1) | |
Text
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CENTRAL FILES N U.
UNITED STATES POR:HQ 4
NUCLEAR REGULATORY COMMISSION
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REGION IV 5
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S11 RYAN DLAZA DRIVE. SulTE 1000 A AUNGTON. TEX AS ~6011 ggggg February 27,198p Docket No.
STN 50-482
[k (f //, p hp Kansas Gas & Electric Co.
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[J Is,t t/,f Attn: Mr. 01. ann L. Koester Vice '< resident-Nuclear f,'1N 111981 [12 Post Office Box 208 Q g g g,cy% C-A W1chita, Kansas 67201 A
Gentlemen:
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This IE Information Notice is provided as an early notific.
r a possibly significant matter and it is expected that recipients will review the informa-mation for possible applicability to their facility.
No response is requested at this time.
If further NRC evaluations so indicate, an IE Circular i
or Sulletin will be issued to further recccmend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, i
/L l
/4]f7
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Karl V. Seyfrit- '/
4 Director
Enclosures:
1.
IE Information Notice No. 81-04 2.
List of Recently Issued l
IE Information Notices cc:
a/ enclosures i
Messrs. Nicnolas A. Petrick, SNUPPS D. T. McPhee,.<ansas City ?cwer and Lignt Comcany l
l Gerald Charnoff, Shaw, Pittman, Pott: & Trewericge E. L Creel, Kansas Gas and Electric Ocmoany i
/
pos20010 I
SS1NS No.: 6835 Accession No.:
8011040265 IN 81-04 UNITED STATES NUCLEAR REGULATORY COMMIfSION OFFICE OF INSPECTION AND ENFLRCEMENT WASHINGTON, D.C. 20555 February 27,1981 IE Information Notice No. 81-04:
CRACKING IN MAIN SIEAM LINES Description of Circumstances:
The Virginia Electric Power Company promptly notified the NRC on February 23, 1981 that a radiography examination, during the ongoing steam generator replacement outage at Surry Unit 1, had revealed a lengthy crack indication in the I.D. counterbore area of a weldment on the in-line "T" fitting whi'ch connects the vertical run of 30-inch piping to the safety relief valve header and 30-inch main steam line of Steam Generator "A".
This piping connection is located outside the containment penetration immediately upstream of the main steam isolation valve as shown in the attached sketch.
A visual and dye penetrant examination on the pipe I.D. surface of the weldment nearest the containment penetration established that the cracking extended 0
about 120 F around the fitting counterbore between the 4 o' clock to 8 o' clock position.
Cracking was also observed in the weld counterbore at the opposite end of the T-fitting during visual examination of the piping interior.
Radio-graphic examination of "B" and "C" main steam line T-fitting welds disclosed crack indications at similar locations.
Metallurgical specimens of the cracking were trepanned from the T-fitting of the "A" main steam line for rnalysis.
Controlled excavation and depth l
measurements of the crack at its mid-length indicated a crack depth of about 0.C90" in this location.
The cause of cracking has not yet been established.
l VEPC0 has planned an ultrasonic examination. of similar weldments in Surry Unit 2 main steam lines utilizing " Hot Piping" ultrasonic techniques.
Preparations are also being made to ultrasonic examine similar weldments at North Anna Unit 1, currently in cold shutdown for refueling.
Recommendation to Licensees:
This information is provided as an early notification of a significant safety matter that is still under review by the NRC staff.
It is expected that recipients will review the information for possible applicability to their plants.
For those plants having are currently in a refueling or >
j that a ultrasonic and/or radiogr DUPLICATE DOCUMENT counterbore areas of the T-fitti operations, unless some current Entire ciocument previously I
is available, entered into system under:
K 0//0# o 2 1, 5 Am No. of pages:
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