ML18142B878

LER 1975-009-00 for R. E. Ginna, Pinhole Leak in Cap Attached to Magnetic Control Rod Drive Rod Travel Housing K-7

ML18142B878
Person / Time
Site:	Ginna
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: ML18142B878 (4)

Text

NRC 'TRIBUTIQN FOR PART 50 DOCK MATERIAL (TEMPO A A R Y Fo RM)

CONTROL NQ:

FILE. XNCXDEHZ REPORT AXLE FRQM:Rochester Gas 6 Electric DATE OF DOC DATE REC'D LTR TWX RPT OTHER Rochester, NoY, Co.

4-22-75 5 5 75 XX TO: ORIG CC OTHER SENT AEC PDR

.Tames P, O'Reilly 1 Signed SENT LOCAL PDR CLASS UNCLASS PROPINFO INPUT No CYS REC'D DOCKET No:

XXX '1 50-244 DESCRIPTION: ENCLOSURES:

Ltr. trans the followingo .. ~ Abnorm. Occurr. 5 75-09, on 4-10-75, concern-ing Pinhole leak in canopy section od cqp above seal weld of cap to housing,.c,.e '3 cy. Encl.+AC'd) n,'gQ ~

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ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N.Y. 14649 I.EON D. WHITE. JR. TEI.EPNONE VICE PRESIDENT AREA COOK Tld 546-2700 Pprili~23, $+75 EC r IIIE IISSa<

Mr. James P. O'Reilly, Director @gal U. S. Nuclear Regulatory Commissi n *I A "lt Office of Inspection and Enforcemen IP p/rd.oI ~'~

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

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 P. Knuth (40)

LICENSEE EVENT REPQR CONTROL BLOCK: (PLEASE PRINT ALL REQUIRED INFORMATION)

UCEN SEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE Qg89 N Y.R 5 G I 0 0 0 0 0 0 0 0 0 4 1 1 1 I ~01 7 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE

[oagcom'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 I

EVENT DESCRIPTION toad] Visual inspection of caps on CRD rod travel housings revealed a powdery deposit on 7 8 9 ( 80 the K-7 cap. Subsequent dye penetrant examinations revealed a pinhole leak in the 7 89 80 tOOj4 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

@75 50-244 75-09.

7 8 9 80

~ ~06 7 8 9 FAME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLER MANUFACTURER VIDLATGN

~CA ~E C 0 N R 0 D N 1 2 0 N 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION Jog A parently 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 80

~10 wall section of the cap.

7 89 80 FACIUTY METHOD OF STATUS 55 POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION

~oo o NA b visual and dye penetrant test 7 8 9 10 12 13 44 45 46 80 FORM OF AcrrvrrY CDATENT RELEASEO OF RELEASE AMOUNT OF ACTNITY LOCATION OF RELEASE Qg H z NA 7 8 9 10 ~.11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Pg Locoo I 8 NA 7 8 9 11 12 13 80 PERS'ONNEL INJURIES NUMBER DESCRIPTION

~~~ ~oo o NA

,7 8 9 , 11 12 80 OFFSITE CONSEQUENCES

[<is] NA 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION

~16 NA 7 89 10 80 PUBLICITY pi~] NA 7 89 80 ADDITIONAL FACTORS

[ice] NA 7 89 80 7 89 80 NAME: Charles E. Platt PHONE. 3 1 5-52 4-5 35 1 GPO 881 88T

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