PNO-II-81-005, on 810115,during Special Surveillance,Two Cracks Discovered in Rotor of Low Pressure Turbine B.Cause Unknown,Insp Continuing.Cracking Similar to Previously Identified Cracking at Other Facilities
| ML19345E872 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/15/1981 |
| From: | Kellogg P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML19345E867 | List: |
| References | |
| PNO-II-81-005, PNO-II-81-5, NUDOCS 8102060308 | |
| Download: ML19345E872 (1) | |
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o PRE 1.1MINARY NOTIFICATION January 15, 1981 PRKLIMINARY NOTIFICAT10N OF EVENT OR UNUSUAL OCCURRENCE PNO-II-81-05 This preliminary notification constitutes EARLY notice of an even of POSSTELE safety or,puh'.ic interest significance.
The info.rmation presented is as initially received without yerification or evaluation and is basically all that is known by IE staff as of this date EACIL1,TY: Virginia Electric and Power Company North Anna Unit 1 Docket No. 50-338 Mineral, Virginia SLMCT:
DISK CRACKINC IN hT.STTNGHOUSE TURBINES Du'ing this refueling outage, special surveillance of the main turbine disk for r
cracking was being performed in respouse to generic concerns expressed by the NRC.
The results of this surveillance have identified two cracks in the rotor of the B low pressure turbine. The cracks are Incated in a keyway and are 360 mils and 200 mils in depth and are 1 inch and 0.5 inches in length, respectively. Inspection is continuing and corrective actions are being pursued with Westinghouse.
This cracking is similar to cracking which has been previously identified at other Region II facilities and facilities in other regions.
Media interest is not expected. Neither the licensee nor the NRC plan to inaue a press release. The Comrnonwealth of Virginia has been notified, Region II (Atlanta) received notification of this occurrence by telephone from the resident inspector at 11:00 a.
on January 15.
~~
Conta_c t:
P. Kellogg, RII 242-5649; P. Kellogg, RII 242-5649 Distribution:
Transmitted H. St. /2:$3 Chairman Ahearne Commissioner Hendrie S. J. Chilk, SECY Commissioner Giliusky Commissioner Bradford C. C. Kammerer, CA ACRS (For Distribution)
Transmitted: MNBB, hl 7 P. 81dg.f *YO IE:%00S //1.50 (IR:Jfg Dist.)
V. J. Dircks, EDO H. R. Denton, NRR C. Michelson, AEOD R. H. Vollmer, NRR Landow (6 min /page)
J. J. Touchard, FA F. Schroeder, NRR J. J. Cunnings, CIA N. M. Haller, MPA D. F. Ross, NRR R. G. Ryan, SP D. Eisenhut, NRR MAIL H. K. Shapar, ELD S. H. Hanauer, NMR R. Minogue, SD IE:XOOS Applicable Resident Site Willste.
Document Mgt. Br. (For PDR/LPE.
Regional Offices J. G. Davis, NMSS S. Ebbin, NSOC Applicable Utility T. E. Murley, RES PRELIMINARY NOTIFICATION sie e ce o 3CS
.