ML20028E020

LER 82-084/03L-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

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: ML20028E011 ML20028E020
References
LER-82-084-03L-01, LER-82-84-3L-1, NUDOCS 8301200258
Download: ML20028E020 (1)

Text

.- ,

, 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 0 RC /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)

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 STATUS  % POWER DISCOVERY DISCOVERY DESCRIPTION (32)

/1/5/ /E/ (28) /1/0/0/ (29) / OTHERNA STATUS

/ ( /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 /

I PERSONNEL INJURIES 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 /////////////

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