05000339/LER-1980-101-03, /03L-0:on 801211,nonconservative Constants Found Entered on 801129 Into Fq Survey Program Used to Verify Fz within Limits.Caused by Computer Technician Error After Disc Changeout.Correction Made

/03L-0:on 801211,nonconservative Constants Found Entered on 801129 Into Fq Survey Program Used to Verify Fz within Limits.Caused by Computer Technician Error After Disc Changeout.Correction Made

ML20002C215
Person / Time
Site:	North Anna
Issue date:	01/02/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20002C212	List: 05000339/LER-1980-101, Forwards LER 80-101/03L-0 05000339/LER-1980-101-03, /03L-0:on 801211,nonconservative Constants Found Entered on 801129 Into Fq Survey Program Used to Verify Fz within Limits.Caused by Computer Technician Error After Disc Changeout.Correction Made
References
LER-80-101-03L-01, LER-80-101-3L-1, NUDOCS 8101090638
Download: ML20002C215 (2)

LER-1980-101, /03L-0:on 801211,nonconservative Constants Found Entered on 801129 Into Fq Survey Program Used to Verify Fz within Limits.Caused by Computer Technician Error After Disc Changeout.Correction Made

Event date:
Report date:
3391980101R03 - NRC Website

text

O

. EAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/V/A/N/A/S/2/ (2)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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L/ (6)

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(8) / o/1/ of 2/ 8/1/ (9)

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

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On Deceniber 11, 1980 while operating in mode 1 at 25% power it was discovered /

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that non conservative constant were entered into the FQ survey program which /

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was used to verify FZ within.imits on 11-29-80.

This event reportable

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pursuant to T.S. 6.9.1.9.c.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/R/C/ (11) /A/ (12) [C/ (13) /Z/Z/2/Z/Z/Z/ (14) g/ (15) g/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

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ACTION FUTURE EFFECT SHUTDOWN ATTACIDfENT NPRD-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/F/ (18) /G/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) g/ (23) /_N/ (24) /N_/ (25) /W/1/2/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The incorrect constants were entered by the computer technician after a disc

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changeut. The original data was dum' ped on tape and an old tape was used when /

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reloading. Upon discovery, the corrected FQ survey constants per most recent /

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survey update were entered and subsequent FQ surveys were satisfactory.

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FACILITY METHOD OF DISCOVERY DESCRIPTION (32)

STATUS

% POWER OTHER STATUS

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/ ENGINEER OBSERVATION /

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/_E/ (28)

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NA ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELI"sSE (36)

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[Z/ (33)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) /

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PERSCNNEL INJUT ES NUMBER DESCRIPTION (41)

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NA

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LOSS OF OR DAMAGE TO FACILITY (43)

TYPE

DESCRIPTION

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PUBLICITY ISSUED DESCRIPT!0N (45)

NRC USE ONLY L2LO/

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NA

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8101090 W l

O Virgini. Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of I Docket No. 50-339 Report No. LER 80-101/03L-0

Description of Event

On December 11, 1980 while operating in mode 1 at 25% power it was discovered that non conservative constants were entered into the FQ survey program and subsequently used to verify F within limits on Z

11-29-80. This discovery was made when a member of the reactor engineering group was checking the FQ survey program prior to exceeding 90% power after a startup. The program was accessed to print out the constants and they were found to be incorrect. This event is reportable pursuant to T.S. 6.9.1.9.c.

Probable Consequences of Occurrence It is possible that operating with non-conservative constants in the FQ survey program may cause peaking limits to be exceeded without warning. However, because FQ surveys done prior to and subsequent to this event (with the correct constants inserted) demonstrated the peaking limits to be within an allowable margin, the health and safety of the public were not affected by this event.

Cause of Event

The incorrect constants were entered by the computer technicians after a disc changout subsequent to a computer failure. The original data was dumped on a tape until the disc changout was completed. When reloading the disc, an old tape consisting of previously utilized FQ survey constants was used. These, constants were later found to be non-conservative in nature.

Immediate Corrective Action

The corrected FQ survey constants per most recent surveillance update were entered prior to exceeding 90% power. Subsequent FQ surveys l

were completed with satisfactory results.

l Scheduled Corrective Action A program will be developed that will check the constants for the FQ survey periodically and after loading of data subsequent to computer failure and to compare these constants with what was initially inserted.

Actions Taken to Prevent Recurrence i

i Above scheduled correction actions will be sufficient to prevent recurrence.

Generic Implications l

There are no generic implications to this event.

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