ML18142B862

LER 1975-004-00 for R. E. Ginna, Reactor Protection Channel I Overpower Delta-T Trip Setpoint Drift

ML18142B862
Person / Time
Site:	Ginna
Issue date:	08/21/1975
From:	White L Rochester Gas & Electric Corp
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1975-004-00
Download: ML18142B862 (6)

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's Nf. ISTRIBUTION FOR PART 50 DO:T MATERIAL (TEMPORARY FORM) )

CONTROL INCIDENZ REPORT FILi NO'ILE.

FROM. Rochester Gas 6 Electric

'C C 'DATE OF DOC DATE R EC'D LTR TWX RPT OTHER Rochester, N.:Y.

L.D. White 8-2i- 75 8-26-75 TO: ORIG OTHER SENT AEC PDR James O'Reilly NONE;:

SENT LOCAL PDR CLASS UNC LASS PROP INFO INPUT NO CYS REC'D DOCKET NO:

2 50-244 DESCRIPTION: ENCLOSURES:

Ltr. trans the following. ~ ~ ~ ~

. T trip setpefnt drift.....,", ~ ~ 'P Unusual Event'ff 75;04 on 8>>13-75, concerning Reactor protection ckannel I overpowe~delta- "

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'Regulatory Docket"',FiN ssss ROCHESTER GAS AND ELECTRIC CORPORATION o'9 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON O. WHITE, JR. 4T VICC PRC. lOCRT k'ClSPHO Auss cooc Tse GC6.2700 Aug us ~>'

+~ Q Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission ~O/g Pg~

Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Subject:

Unusual Event 75-04, Reactor protection channel I overpower delta-T trip setpoint drift.

R. E. Ginna Nuclear Power Plant, Unit No. 1 Docket No. 50-244

Dear Mr. O'Reilly:

IIn accor dance ance with wi Technical Specifications, Artiele 6.6.2b, the attached report of Unusua 1 Even t 75-04 i's hereby submitted. Two additional cop ies of this letter and the attachment are enclosed.

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

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

Mr. William G. McDonald (3) 8063;

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I' LICENSEE EVENT REPC

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'ONTROL BLOCK: (PLEI4BE PRINT ALL REQUIRED II'lIFORMATION) 6 UCENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE N Y R E G 1 0 p 0 0 0 0 0 0 0 4 1 1 1 1 L003I 7 89 '14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYrE SOURCE DOCKET NUMBER EVENT'ATE REPORT DATE

~01 CON I ~PO ~L L 0 5 0 0 2 4 4 0 8 1 3 7 5 0 8 2 1 7 5 7 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION 7

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7 8 9 8 9 89 While performing reactor protection periodic test, PT-5.10, on protection channel I, the overpower delta-T trip bistable (TC-405A) setpo'nt was found to be off in the non-conservative direction by 1.78F. This unit is part of a 2/4 reactor trip logic. The 80 80

[oO~J other 3 channels were operational. This is the first such failure within this protection80 7 8 9

[os system. The unit was replaced with a bench tested s are unit. Unusual Event 7 8 9 SYSTEM CAUSE PRME COMPONENT COMPONENT 50-244/75-04) .

CODE CODE COMPONENT CODE SUPPUER MANUFACTURER VQIATION

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~S I N S T R U N F 1 8 0 11 12 17 43 44 47 48 CAUSE DESCRIPTION Jog Subsequent testing indicated that a Foxboro 43 V d.c. zener diode in the regulated 7 8 9: 80 Jog power supply circuit had failed. This is a random component failure, and the normal 7 8 9 80

~10 surveillance frequency will be continued.

7 89 I 80 FACIUTY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION

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12 13 NA 44 45 FORM OF 46 80 ACTIVITY CoriTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF REI.EASE p

12 H H NA NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q~g ~00 0 S NA 7 89 11 12 13 80 INJURIES 'ERSONNEL 7 89 11 12 80 OFFSITE CONSEQUENCES'<is]

7 89 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION Qs] S NA 7 89 10 80 PUBLICITY 7 .89 80 ADDITIONAL FACTORS

~18 7 89 80 7 89 80 NAME: G. H. Paris PHDNE.716-546-2700, ext. 291-223 CPO 881 ~ 0 GT

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