ML19345H572

LER 81-036/03L-0:on 810501,axial Flux Difference Deviated Greater than 5% from Target for Max of 10 Minutes During Load Reduction.Caused by Load Being Reduced in Order to Perform Turbine Valve Freedom Periodic Surveillance Test

ML19345H572
Person / Time
Site:	North Anna
Issue date:	05/15/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345H570	List: ML19345H569 ML19345H572
References
LER-81-036-03L, LER-81-36-3L, NUDOCS 8105210281
Download: ML19345H572 (2)

Text

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/

RCE /L/ (6) /0/5/0/0/0/3/3/9/ (7) /0/5/0/1/8/1/ (8) / 0'5/1/5/O f1/ (9)

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

/0/2/ / On May 1, 1981, with Unit II at 87% power, the Axial Flux Difference deviated /

/0/3/ / > 5% from the target for a maximum of ten minutes during a load reduction. Since/

/0/4/ / the Axia L Flux Difference was restored within the operating band within the time /

/0/5/ / required by the Action Statement (15 minutes), the health and safety of the /

/0/6/ / public were not affected. /

/0/7/ / /

/0/8/ / /

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

/0/9/ /R/C/ (11) /X/ (12) /Z/ (13) /Z/Z/Z/Z/Z/Z/ (14) g/ (15) LZ/

Z (16)

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

(17) REPORT NUMBER /8/1/ [-/( /0/3//6 /\/ /0/3/ /L/ /-/ [0/

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

/X/((18) /Z/ (19) /Z/( (20) [Z/( (21) /0/0/0/0/ (22) g/ (23) /N/ (24) //Z (25) /2/9/9//9 (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The Axial Flux Difference > 5% was exceeded when load was reduced in order to /

/1/1/ / perform the Turbine valve freedom periodic surveillance test. A dilution was /

/1/2/ / begun and rods were driven in, in order to correct for the flux deviation. /

/1/3/ / /

/1/4/ / /

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

/1/5/ /X/ (28) /0/8/7/ (29) / NA / (30) /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 NUMBER DESCRIPTION (41)

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

LOSS TYPE OF OR DAMAGE TO FACILITY (43)

DESCRIPTION

/1/9/ [Z/ (42) / NA /

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

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

t NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8.10s s io pF/

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

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 81-036/03L-0 Description of Event On May 1, 1981, with Unit II at 87% power in mode I, the axial flux-difference was observed to be deviating for the target band (15%) for a period of ten minutes. This event is contrary to T. S. 6.9.1.9.b.

Probable Consequences of Occurrence Since the Axial Flux Difference was brought back within 15% of the

'arget band within fifteen minutes as required by Technical Specifications,

he public health and safety were not affected.

Cause of Event The Axial Flux Difference (> t 5% of target band) was exceeded when , .,

load was reduced in order to perform the turbine valve freedom periodic surveillance test.

Immediate Corrective Action The immediate action was to commence dilution and to insert the rods into the core until the axial flux difference was within the operat-ing band as specified by T.S. 3.2.1.

Scheduled Corrective Action There are no scheduled corrective actions.

Actions Taken to Prevent Recurrence No actions needed to prevent recurrence.

Generic Implications There are no generic implications to this event.

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