ML19320B106

LER 80-022/03L-0:on 800609,w/plant in Mode 3,containment Sump Flow indicator,FTO-DA-215,stopped Measuring Flow Correctly.Caused by Clogged Strainer Located within Instrument,Preventing Proper Rotation of Flow Sensor

ML19320B106
Person / Time
Site:	North Anna
Issue date:	07/02/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19320B104	List: ML19320B103 ML19320B106
References
LER-80-022-03L-02, LER-80-22-3L-2, NUDOCS 8007090312
Download: ML19320B106 (2)

Text

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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

/L/ (6) /0/5/0/0/0/3/3/9/ (7) /0/6/0/9/8/0/, (8) / 0/ 7/ 0/ 2/ 8/ 0 (9)

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

/0/2/ / On June 9, 1980, with the plant in mode 3, the containment sump discharge /

/0/3/ / flow totalizer, FTO-DA-215, stopped measuring flow correctly and was declared /

/0/4/ / inoperable. Since the containment atmosphere particulate and gaseous radio- /

/0/5/ / activity monit aring system remained operable to detect RCS leakage, the /

/0/6/ / health and safety of the general public were not affected. This is contrary /

/0/7/ / to T.S. 3.4.6.1 and reportable pursuant to T.S. 6.9.1.9.b. /

/0/8/ / /

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /C/I/ (11) /E/ (12) /B/ (13) /I/N/S/T/R/U/ (14) [Q/ (15) /Z/ (16)

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

(17) REPORT ,

NUMBER /8/0/ /-/ /0/2/2/ /\/ [0/3/ /L/ /-/ [0/

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

/X/ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) fY/ (23) /N/ (24) /A/ (25) /X/9/9/9/ (26:

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

-/1/0/ / A strainer located within the flow totalizer was found to be clogged whid /

/1/1/ / prevented proper operation of the rotating element causing incorrect flow /

/1/2/ / indication. After the foreign material was removed, the totalizer was /

/1/3/ / reassembled and tested by procedure, and returned to service. /

/1/4/ / /

FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DESCRIPTION (32)

!/1/5/ /B/ (28) } DISCOVERY

/0/0/0/ (29) / NA /( /A/ (31) / OPERATOR OBSERVATION /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (351 LOCATION OF RELEASE (36) t/1/6/ /Z/ (33) /Z/ (34) / NA / / NA /

i PERSONNEL EXPOSURES NUMBER m? DESCRIPTION (39)

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

PERSONNEL INJURILS l NUMBER DESCRIPTION (41) l/1/8/ /0/0/0/ (40) / NA / '

i LOSS OF OR TYPE DAMAGE TO FACILITY (43)

DESCRIPTION l/1/9/ /Z/ (42) / NA / )

PUBLICITY  !

ISSUED DESCRIPTION (45) NRC USE ONLY

/2/0/ /N/ (44) / NA /////////////

8 0 0 7 0 9 0 3M0F PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 _

Virginia Electric and Power Company North Anna Power Staion Unit #2

Attachment:

Page 1 of I Docket No. 50-339 L yort No. LER 80-022/03L-0 Description of Event On June 9, 1980, with the plant in mode 3, the containment sump flow indicator, FTO-DA-215, ceased to function correctly and was declared inoperable. This event was contrary to T.S. 3.4.6.1.

Probable Consequences of Occurrence The consequences of this event were minimal because the containment atmosphere particulate and gaseous radioactivity monitoring systems both remained operable to detect Reactor Coolant System leakage. As a result, the health and safety of the general public were not affected. There are no generic implications associated with this event.

Cause of 0.currence FTO-DA-215 stopped indicating total flow because the strainer located within the instrument was clogged preventing proper rotation of the flow sensor.

Immediate Corrective Action The flow integrator was declared inoperable and an Emergency Main-tenance Report was submitted. The strainer was removed, cleaned and replaced and FTO-DA-215 was tested by procedure and returned to service.

Scheduled Corrective Action No scheduled corrective action is required.

Action Taxen to Prevent Recurrence No further actions are required.

Generic Implications None apparent at this time.

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