05000280/LER-2075-013, Re One Channel T Protection Was Not Conservative

Re One Channel T Protection Was Not Conservative

ML19105A214
Person / Time
Site:	Surry
Issue date:	07/28/1975
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 616 LER 1975-013-00
Download: ML19105A214 (2)

LER-2075-013, Re One Channel T Protection Was Not Conservative

Event date:
Report date:
2802075013R00 - NRC Website

text

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.***, the. Virgin.ia *Electric ;and Power. C~mpany: hereby.submits* toity ~ (l*O).: copies - *

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_* Tj1~* Bub~tance.. of.. this ~ep~'rt hli~_**:been':r.evie~ed: by' ~h~: Station::Ntu~lear Safety and Operating Committee and. w.i.11

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LICENSEE EVENT REPORT AO-S2-75-13 I I I I I 6

-[PLEASE PRINT ALL REQUIRED INFORMAYION)

CONTROL BLOCK*

LICENSEE NAME

@El !vi Aj s! Pjs !2 I 7

8 9 14 CATEGORY REPORT TYPE.

LICENSE NUMBER I O I O 1-1 ° I O IO I 01 ° 1-1 ° I O I 15 25 REPORT SOURCE DOCKET NUMBER LICENSE TYPE l4ll 1111101 26 30 EVENT DATE EVENT TYPE IO I 1 I 31 32 REPORT DATE

@ElcoN'T Ip I o I lu L!,J LOI 51 °1~1 °1 2 1 81 ~ Lo I 7 I 2 I o I 7 I s 1 jOj712!4!7!SI 7

B 57 58 59 60 61 68 69 74 75 80

EVENT DESCRIPTION

@lg] !During normal operation, it was found that one channel of 6T protection was not cor.~

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• 7 8 9 80

@g] [servat.ive, in violation of Technical Specification 2. 3.

The cold leg low level j

7 8 9 80

@El kE1Plifier failed causing the Channel I 6T protection signal to be low.

The failed j

7 B 9 BO

@:@} !amplifier was replaced and the channel was calibrated.

AO-S2-7 5-13 I

7 B 8 BO

~ ;:;-------------__;__ ______________________ _j, 7

B 9 PRIME 80 SYSTEM CODE

CAUSE

CODE COMPONENT CODE

@j [r !A I ~ jr IN !s ITIRjuJ 7

8 9 10 11 12 17 CAUSE DESCRIPTION COMPONENT SUPPLIER

~

43 COMPONENT MANUFACTURER jH IO 12 IO I 44 47 VIOLATION 12.J 48

~

jAn investigation revealed that the occurrence was caused by the failure of the low 7

8 9

@El !level amplifier oscillator card (Hagan Assy 399615}.

The module was in service for 7

8 8 IT@} L~pproxi.~ately one year and a half prior to the occurrence.

The card will be (con't) 7 8 9 EE]

7 8

FACILITY STATUS w

9 METHOD OF

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION L! I O I O

.___N/_A ___ ___.I w N/A 10 12 13 44 45 46 cor~TENT J

80

_J 80 J 80 J

80 rn FORM OF ACTIVITY RELEASED w

OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE w

.__I...::.:.N~/A;____ ____

__J,.

IN/A

_J 10 11 44 4'::5----------,------------

80 7

8 9

PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

~ Io Io I oJ l1_J N/A 7

B 9 11 12 13 BO PERS"ONNEL INJURIES NUMBER

DESCRIPTION

rn I a, o 1 01 N/A 7

8 9 11 1;;2:--------------------------------------___j 80 OFFSITE CONSEQUENCES rn N/A 7

8 9 80 LOSS OR DAMAGE TO FACILITY TYPE

DESCRIPTION

EEW

~~N~A,:__ ___________________________ _J 7

8 9 10 J

• BO PUBLICITY [ill] I N/A J

7 8 9 80 ADDITIONAL FACTORS

~ I CAUSE DESCRIPTION (con't): returned to Hagan for repair.

No other corrective action 7

8 9

~ I is deemed necessary.

7 8 9 NAME:

E. M. Sweeney, Jr.

PHONE: (804) 357-3184 80 J

80 GPO 681,667 I

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