05000339/LER-1980-058-03, /03L-0:on 800909,steam Flow Indicator Fi 2494 Was Reading High W/Little or No Flow.Channel Declared Inoperable & Placed in Trip Mode.Cause Not Determined.Instrument to Be Examined During Next Mode 5 Outage

/03L-0:on 800909,steam Flow Indicator Fi 2494 Was Reading High W/Little or No Flow.Channel Declared Inoperable & Placed in Trip Mode.Cause Not Determined.Instrument to Be Examined During Next Mode 5 Outage

ML19351D641
Person / Time
Site:	North Anna
Issue date:	10/07/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19351D640	List: 05000339/LER-1980-058, Forwards LER 80-058/03L-0 05000339/LER-1980-058-03, /03L-0:on 800909,steam Flow Indicator Fi 2494 Was Reading High W/Little or No Flow.Channel Declared Inoperable & Placed in Trip Mode.Cause Not Determined.Instrument to Be Examined During Next Mode 5 Outage
References
LER-80-058-03L-01, LER-80-58-3L-1, NUDOCS 8010140409
Download: ML19351D641 (2)

LER-1980-058, /03L-0:on 800909,steam Flow Indicator Fi 2494 Was Reading High W/Little or No Flow.Channel Declared Inoperable & Placed in Trip Mode.Cause Not Determined.Instrument to Be Examined During Next Mode 5 Outage

Event date:
Report date:
3391980058R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIhED INFORMATION)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On September 9, 1980 while in Mode 3, it was noted that the steam line flow

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indicator FI 2494 was reading abacrmally high with little or no flow.

Since

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this indicated a possible channel failure, the channel was declared inoperable /

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and placed in the trip mode within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> as per T.S. 3.3.2.1.

Therefore, the /

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health and safety of the public were not affected. This item is reportable

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pursuant to T.S. 6.9.1.9.b.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE I

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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/X/ (18) /X/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) g/ (23) /N/ (24) /N/_ (25) /R/3/6/9/ (26) 1 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The exact cause of this event is not known at this time. The channel calibra- /

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tion does not establish the linearity of this channel when less than about 10% /

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steam flow. The power was increased to greater than 10% steam flow, the

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channel returned to within tolerance and was declared operable.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS

/ (30)DISCOERY DISCOERY DESCRIPTION (32)

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[Bf (28)

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NA

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/ Operator Observation

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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1 PERSONNEL INJU7R ES NUMBER DESCRIPTION (41)

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LOSS OF OR DAMAGE TO FACILITY (43)

TYPE DESCR1 TION

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PUBLICITY ISSUED-DESCRIPTION (45)

NRC USE ONLY j

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8010140409

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I Virginia Electric and Power Company North Anna Power Station, Unit 2

Attachment:

Page 1 of 1 Docker No. 50-339 Report No. LER 80-058/03L-0

Description of Event

OnSeptember9,Ig80itwasnotedthatthesteamflowindicatorFI 2494 was reading.7x10 pounds / hour with little or no actual steam flow.

The channel was placed in the trip mode within one hour as per TS.

3.3.2.1.

't Probable Consequences of Occurrence The channel FI 2494 was placed in the trip mode and the two redundant channels remained operable at all times. Therefore, the health and safety of the public were not affected.

Cause of Event

The exact cause of this event is not known at this time. The calibration checks are correct and are consistent with the other channel settings. However, in the range between 0% and 10% steam flow, the instrument response is non-linear. When above 10% steam flow, this response becomes linear.

Immediate Corrective Action

When the power (steam flow) increased to above 10%, the channel indicated properly. Therefore no immediate corrective action was necessa ry.

Scheduled Corrective Action The instrument will be examined during the next scheduled Mode 5 outage in order to identify the cause of this problem. Corrective action will be taken as required.

Actions Taken to Prevent Reccurrence Actions required to prevent recurrence will be determined when the exact cause is known.

Generic Implications Generic implications will be determined when the exact cause is known.

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