ML18142B880

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LER 1975-009-00 for R. E. Ginna, Pinhole Leak in Cap Attached to Magnetic Control Rod Drive Rod Travel Housing K-7
ML18142B880
Person / Time
Site: Ginna Constellation icon.png
Issue date: 04/22/1975
From: White L
Rochester Gas & Electric Corp
To: O'Reilly J
NRC/IE, NRC Region 1
References
LER 1975-009-00
Download: ML18142B880 (5)


Text

NRC Dlb. IBUTION FOR PART SO DOCKET .TERIAL (TEMPORARY FORM)

CONTROL NO:

FILE IHCXDEhf REPORT FILE FROM: Rochester Gas & Electric CS+QE OF DQC DATE R EC'D LTR TWX RPT OTHER Rochester, N.Y. 4-22-75 4>>30-75 ORlG CC OTHER SENT AEC PDR xxxxxx James P. O'Reilly HONE SENT LOCAL PDR CLASS UNC LASS PROP INFO INPUT NO CYS REC'D DOCKET NO:

50-244 DESCRIPTION: ENCLOSURES:

Ltr.. trans the following.... Abnorm. Occurr. ig 75-09, on '4-l0-75, concerning Rod Drive Rod Tracel Housing'-7 '.

Pinhole X,eak in cap attached to Magnetic Control

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( 40 cys. Encl; Rec ') -';.-

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'e'yP ROCHESTER GAS AND ELECTRIC CORPO . OH o 89 EZg'II~YE UC ROCHESTER, H.Y. 14649 LEON D. WHITE. JII T C 1. C P II0 N C VICE PIIL'SIDCNT AIICA CONC TIII 5 F16.2700 Ol April 22, 1975 Q Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Subject:

Abnormal Occurrence 75-09, Pinhole leak in cap attached to Magnetic Control Rod Drive Rod Travel Housing K-7 R. E. Ginna Nuclear Power Plant, Unit No. 1 Docket No. 50-244 I

Dear Mr. O'Reilly:

In accordance with Technical Specifications, Article 6.6.2a, the attached report of Abnormal Occurrence 75-09 is hereby submitted. Two additional copies of this letter and the attachment are enclosed.

.Very truly yours, L. D. White, r.

Attachment cc: Mr. Donald F. Knuth (40)

4

~e' A LICENSEE EVENT REPO CONTROL,. BLOCK: (PLEASE PAINT ALL REQUIRED IHFORI"IATIOM) 1 UCEN SEC LICENSE EVENT NAME LICENSE NUMBER TYPE TYITE N Y R E G 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~01 7 89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE ggcCITT ~MI T L 0 5 0 0 2 4 4 0 4 1 0 7 5 0 4 2 2 7 5 7 8 57 58 59 60 61 68 '69 74 75 80 EVENT DESCRIPTION Jog Visual inspection of caps on CRD rod travel housings revealed a powdery deposit on 7 8 9 80 t003 the K-7 cap. Subsequent dye penetrant examinations revealed a pinhole leak in the 7 8 9 80 toa~] canopy section of the cap above the seal weld of the cap to the housing. The PORC 8 9 recommendation of replacement of the cap was carried out. (Abnormal Occurrence Qg8 50-244 75-09.

7 9 80 roag 7 8 9 PNME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPUER MANUFACTURER VIDIATION

[oa7]~CA 2 C CN R 0 D ~N 1 2 0 N 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

[oas] A arentl insufficient torque down of cap permitted path of borated water up through 7 8 9 80 Jog omega seal, the threads, and ultimately through a machining defect at the thinned 7 8 9

~10 wall section of the cap.

7 89 80 FACILITY METHOD OF STATUS 55 POWER OTHER STATUS DISCOVE'RY DISCOVERY DESCRIPTION Q~g 14 ~oo 0 NA b visual and dye penetrant test 7 8 9 10 12 13 44 45 46 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE t11g H z NA NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION pig ~oo 0 H NA 7 89 11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTION

~~~ ~00 o NA 7 89 11 12 80 OFFSITE CONSEQUENCES Q~g NA 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION Q~g H NA 7 89 10 80 PUBLICITY Q/'

NA 89 ADDITIONAL FACTORS Q~g 7 89

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7 89 80 Charles E. Platt PHONE 5 5 4 5 l GPO ee1. eeT

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