ML18142B888

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LER 1975-001-00 for R. E. Ginna, Drop of Two Control Rods
ML18142B888
Person / Time
Site: Ginna Constellation icon.png
Issue date: 03/17/1975
From: White L
Rochester Gas & Electric Corp
To: O'Reilly J
NRC/IE, NRC Region 1
References
LER 1975-001-00
Download: ML18142B888 (4)


Text

NRC DÃRIBUTION FOR PART 50 DOCKET TERIAL (TEMPORARY FORM)

CO FILE INCIDENT REPORT FILE F ROM: Rochester Gas 6 Elec. Co DATE OF DOC DATE REC'D LTR TWX RPT OTHER Roches ter, No Y, L.D. White 3-17-75 3-24-7 TO: ORIG CC OTHER SENT AEC PDR J,P. O'Reilly None SENT LOCAI PDR XXX CLASS UNCLASS 'ROPINFO INPUT NO CYS REC'D DOCKET NO:

XX 30 50-244 D ESC R I PTI ON: ENCLOSURES:

Ltr. reporting abnormal occurr. 8 75-01 Abnormal Occurr. concerning drop of two trans the 'following. ~ . control rods., ~

PLANT NAME: RE Ginna 81 FOR ACTION/INFORMATION VCR 3-24-75 BUTLER (L) SCHWENCER (L) ZIEMANN (L) REGAN (E)

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0 i ~ \ ~ Owl 10%4 RKGUL'ATORYDOCK~~ Fir,g COPy ROCHESTER GAS AICD ELECT P ORATION o 89 EAST AVENUE, ROCIIESTER, N.Y. I f649 LEON O. WKITF.. JB 1CLCP~cONC VICC PRCSIDCNT iRCA COOC 7ie 546-2700 March 17, 1975 v'o 3 "rj, Mr. James P..O'.Reilly, Director U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement ~

Region I octo oo p4p oooo 6'gt"/(p),

NAR84197 631 Park Avenue 8~J gt

"@I Sect(p King of Prussia, Pennsylvania 19406 ~ i

Subject:

Unusual Event 75-01, Drop of two control rods.

R. E. Qinna Nuclear Power Plant,'nit No. 1 Docket No. 50-244

Dear Mr. O'Reilly:

In accordance with Technical Specifications, Article -6.6.2b, the attached

,report of Unusual Event 75-.01 is hereby submitted. Two additional copies of this letter and the attachment are enclosed.

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

Attachment cc: Mr. Donald F. Knuth (30)

LICENSEE EVENT REPCIRTg CONTROL BLOCK:

fPLEABE PRINY ALL REQUIRED IMFORMAYIOFII)

LICENSEE LICENSE EVENT NAME UCENSE NUMBER TYPE TYPE QO1 N Y R E G 1 0 0 0 0 0 0 0 0 0 4 1 1. 1 1 ~03 7 89 14 15 25 26 30 31 32 REPORT REPORT DOCKET NUMBER EVENT DATE REPORT DATE

[OD1] CON'T Lrd hJ 0 5 0 .0 2 4 4 0 3 0 5 7 5 0 3 1 7 7 5 7 8 57 58 61 68 69 74 75 80 I

EVENT. DESCRIPTION Jog During core boring of floor above rod control cabinets, turbine runback to 70% occurred; 7 8 9 80.

B 'bank group 2'cc's GS & G9 were at bottom of core. With unit at hot shutdown, after 7 89 80 tQ inspection B bank was exercised 0-20 steps twice verifying operability. QS & Q9 had 7 8 9 80 dropped-on a previous occasion of water'leak over cabinets. (Unusual Event 50-244/'

8 9 80 Jog 7S-01) .

'N 'IOIATION 7 8 9 PRIE 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPUER MAIilUFACTURER

~RB ~F C 0 N R 0 D 1 2 0 N 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

[QD8] A water hose for boring machine broke at coupling. Water drained thru 2 new holes to 7 8 9 ,80 Qpg top of rod control cabinets, grounding out control power for stationary grippers for rcc's 7 8 9 80 Pro] QS & Q9, allowing them to drop. Core openings were covered; precautionary instruc-7 89 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 7 8 9 E ~io o NA 44 a Rod Bottom Alarm 10 12 13 ~ 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE B H NA NA 7 8 9 , 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

.[ig. ~00 0 ~Pi 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 89 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION Q~g NA 7 89 10 80 PUBLICITY NA 7 89 80 ADDITIDNAL FAcT0Rs Cause Description cont'd.

+18 tions were given to job personnel working above rod control cabinets.

7 89 80 Jig 7 89 80 NAME: Charles E. Platt PRONE. 3 15 524 535 1 GPO 8$ 1