05000339/LER-1982-084-03, /03L-0:on 821216,during Full Power,Input from Range Nuclear Instrument N-42 to Comparator Drawer N-50 Was in Defeat.Caused by Failure to Take N-42 Out of Defeat After Deviation Alarm Determination.Operators to Be Reinstructe

/03L-0:on 821216,during Full Power,Input from Range Nuclear Instrument N-42 to Comparator Drawer N-50 Was in Defeat.Caused by Failure to Take N-42 Out of Defeat After Deviation Alarm Determination.Operators to Be Reinstructed

ML20028E020
Person / Time
Site:	North Anna
Issue date:	01/11/1983
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028E012	List: 05000339/LER-1982-084, Forwards LER 82-084/03L-0 05000339/LER-1982-084-03, /03L-0:on 821216,during Full Power,Input from Range Nuclear Instrument N-42 to Comparator Drawer N-50 Was in Defeat.Caused by Failure to Take N-42 Out of Defeat After Deviation Alarm Determination.Operators to Be Reinstructe
References
LER-82-084-03L-01, LER-82-84-3L-1, NUDOCS 8301200258
Download: ML20028E020 (1)

LER-1982-084, /03L-0:on 821216,during Full Power,Input from Range Nuclear Instrument N-42 to Comparator Drawer N-50 Was in Defeat.Caused by Failure to Take N-42 Out of Defeat After Deviation Alarm Determination.Operators to Be Reinstructed

Event date:
Report date:
3391982084R03 - NRC Website

text

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

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/

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

/0/0/-/0/0/0/0/0/-/0/0/ (3)

/4/1/1/1/1/ (4)

/ / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT 0/1/

R

/L/ (6)

/0/5/0/0/0/3/3/9/

(7)

/1/2/1/6/8/2/

(8)

/0 /1/1/1/8 /3 / (9) 0 RC DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/

/ On December 16, 1982, with Unit 2 at 100 percent reactor thermal power it was

/

/0/3/

/ discovered that input from power range nuclear instrument, N-42, to comparator

/

/0/4/

/ drawer, N-50, was in defeat.

N-42 was subsequently taken out of defeat and

/

/0/5/

/ 2-PT-23 conducted to determine Quadrant Power Tilt Ratio (QPTR). QPTR was

/

/0/6/

/ determined to be acceptable and in agreement with N-50 output therefore the

/

/0/7/

/ health and safety of the public were not affected.

The event is contrary to

/

/0/8/

/ T.S. 4.2.4.1 and reportable pursuant to T.S. 6.9.1.9.b.

/

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/I/E/ (11)

/A/ (12)

/A/ (13) /Z/Z/Z/Z/Z/Z/

(14)

/Z/ (15)

/Z/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

/8/2/

/-/ /0/8/4/

/ /

/0/3/

/L/

/-/

/0/

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

/H/ (18)

/H/ (19)

/Z/ (20)

/Z/ (21) /0/0/0/0/ (22) /N/ (23) /N/ (24) /Z/ (25) /Z/9/9/9/

(26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/

/ On December 15, 1982 during a power reduction N-42 was placed in defeat to deter-/

/1/1/

/ mine which detector was causing a deviation alarm. At 800 Mwe, 2-PT-23 was con- /

/1/2/

/ ducted and QPTR determined satisfactory but N-42 was not taken out of defeat,

/

/1/3/

/ contrary to normal operation and causing invalid QPTR output for 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br />.

/

l

/1/4/

/ Operators will be instructed on the importance of Control Room instrument review./

FACILITY METHOD OF DISCOVERY DISCOVERY DESCRIPTION (32)

STATUS

% POWER OTHER STATUS (

/1/5/

/E/ (28)

/1/0/0/ (29)

/

NA

/

/A/ (31)

/ Operator Observation /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

/Z/ (33)

/Z/ (34)

/

NA

/

/

NA

/

PERSONNEL EXPOSURES

(

NUMBER TYPE DESCRIPTION (39)

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

/

NA

/

PERSONNEL INJURIES I

NUMBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) /

NA

/

LOSS OF OR DAMACE TO FACILITY

)

TYPE

DESCRIPTION

/1/9/

/Z/ (42)

/

NA

/

PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

/2/0/

/N/ (44)

/

NA

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8301200258 830111 PDR ADOCK 05000339 m

PDR