ML19276H216
| ML19276H216 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/25/1979 |
| From: | Klingler G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-181A, NUDOCS 7910150815 | |
| Download: ML19276H216 (1) | |
Text
PRELIMINARY NOTIFICATION June 25, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-181A
(
This preliminary notification constitutes EARLY notice of event of POSSIBLE safety or public interest significance. The information Dresented is as initially received without verificat ion or evaluation 2d is basically all that is known by IE staff on this date.
Facility:
Metropolitan Edison Company Three Mile Island, Unit 1 Middletown, Pennsylvania DN 50-289
Subject:
PIPING CRACKS IN DECAY HEAT SYSTEM SUCTION PIPING (B0 RATED WATER SYSTEMS)
During the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, eleven additional welds in approximately 100 feet of piping from the Borated Water Storage Tank have been ultrasonically examined (UT).
Four of these welds had indications of small cracks in the heat affected zone of the piping. The exact size, location and extent of the indications are still under evaluation.
Additional portions of piping in systems containing stagnant borated water (reactor plant makeup, decay heat removal, and containment building spray) have been visually inspected by the licensee. Four additional locations of potential piping cracks have been identified.
The cracks will be analyzed by metallurgical examination at a later date.
Licensee efforts to identify the extent of the pipe cracking in borated water systems
'.s being expanded.
All welds in stagnant portions of decay heat removal and reactor makeup system piping plus portions of the containment building spray system piping will be ultrasonically examined over this weekend and early next week.
Results will be reported at the conclusion of the examina-tions.
NRC personnel on site are providing continuing followup of this work.
Media interest is expected because of continued public interest in site activi-ties.
The Commonwealth of Pennsylvania has been informed. A press release has been issued by the licensee and NRC concerning the initial identification of the pipe cracking on June 21, 1979.
NP.C, Region I, (Philadelphia) received notification of this occurrence by telephone from the TMI-2 IE Resident office at 3:15 p.m., on June 22, 1979.
Contact:
GKlingler, IE x28019 FNolan, IE x28019 SEBryan, IE x28019 Distribution:
Transmitted H St 9.cf Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinsky ACRS (For Distribution).
Transmitted:
MNBB P. Bldg 9:o,
V. Stello, IE L. V. Gossick, ED0 H. R. Denton, NRR Region Z 9*22 H. L. Ornstein, EDO R. C. DeYoung, NRR J. J. Fouchard, PA R. J. Mattson, NRR N. M. Haller, MPA D. Vassallo, NRR (Mall)
R. G. Ryan, OSP D. Eisenhut, NRR J. J. Cummings, OIA H. K. Shapar, ELD SS Bldg Q' /Q R. Mincgue, SD W. J. Dircks', NMSS S. Levine, RES 1414
$53 PRELIMINARY NOTIFICATION
$910100 /g
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