ML20236T963
| ML20236T963 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/02/1975 |
| From: | Jennifer Davis, Thornburg H, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PN-75-044, PN-75-44, NUDOCS 9807290203 | |
| Download: ML20236T963 (1) | |
Text
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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE July 2, 1975 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE --PN-75-44
'This preliminary notification constitutes EARLY notice of' events of POSSIBLE safety or public interest significance.
The information
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presented is as initially received without verification or evaluation l
and is basically all that is known by OIE staff as of 11:30 a.m. on date of this notification.
IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO l
l BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.
i'"~
Tacility: Commonwealth Edison Co. (Dresden 3)
Subject:
CRACKS IN CRD COLLET HOUSING During the extended refueling outage, the licensee discovered circum-ferential cracks in the thin section of the CRD collet housing. To date cracks have been found (using PT) on 12 of 21 drives checked.
The cracks are stated by GE to result from therral stress. The cracks apparently are not through-wall, and do not go around the entire circumference.
The licensee reported complete shear of the
[2 collet housing at this location would interfere with control rod N
~ ithdrawal.
Evaluation is still in progress to determine whether w
a complete failure could interfere w'ith the scram function. The
[
ya licensee is determining what corrective action will be required.
IE:III inspectors are at the site following the matter.
Decision on a press release will be made after evaluation of the cracks by GL and Commonwealth Edison.
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OIE (Region III) received notification of this occurrence by telephone from the IE inspector at the site at 11: a.m. on 6/27/75. The potential consequences of the cracks were determined on 7/2/75.
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Contact:
RFWarnick, IE x7261 HDThornburg, IE x7353 JGDavis, IE x7541 g
Distribution:
2 Chairman Anders Commissioner Mason S. J. Chilk, SECY Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE Commissioner Kennedy C. C. Kammerer, CA L. V. Goyd.ck, EDO D. F. Knuth, IE J. A. Harris, P4.
B. C. Rus'che, NRR H. H. Brown, ISP T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD MNBB7 Transmitted: PBldg[.
H St Luge t
a PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE
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9807290203 750702 PDR 18 E PN-75-044 PDR (J,.
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