ML19351E652

LER 80-087/03L-0:on 801029 Axial Flux Difference Twice Deviated Greater than 5% from Target.Caused by 10% Load Swing & 50% Load Rejection from 100% Power for Startup Testing.Power & Control Rod Manipulations Performed

ML19351E652
Person / Time
Site:	North Anna
Issue date:	11/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19351E646	List: ML19351E645 ML19351E652
References
LER-80-087-03L-01, LER-80-87-3L-1, NUDOCS 8012100570
Download: ML19351E652 (2)

Text

. _ _.

O "' ,, LICENSEE EVENT REPORT u s suctt^a xecut^toar coxxission 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 NIRiBER LICENSE TYPF CAT

!!! /0/5/0/0/0/3/3/9/ (7) /1/0/2/9[8f0/, (8) /1/1/ 2/ 4/ 8 /Of (9)

E b/-(6)

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

/0/2/ / On October 29, 1980, with startup testing in progress, the Axial Flux Differ- /

/0/3/ / ence twice deviated greater than 5% from the target. The Axial Flux Differ- /

/0/4/ / ence was outside the target band for an 8 minute duration while at 90% power /

/0/5/ / and again for 34 minutes while operating at a power level below 81%. Since /

/0/6/ / penalty accumulation were less than 15 minutes and less than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> respective-/

/0/7/ / ly, operations was allowed to continue as per Action Statement a.1 and a.2 of /

/0/8/ / T.S. 3.2.1. As a result, the public health and safety were not affected. /

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

/0/9/ /R/C/ (11) /X/ (12) /Z/ (13) /Z/Z/Z/Z/Z/Z/ (14) g/ (15) g/ (16)

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

(17) REPORT NUMBER /8/0/ /-/ /0/8/7/ /\/ /0/3/ [L( /-/ g/

ACTION FUTURE EFFECT SHUTDCWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON GT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MAWFACTURER

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

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The AFD deviations resulted from a 10% load swing and 50% load rejection from /

/1/1/ / 100% power for startup testing. Immediate corrective action was power and con-/

/1/2/ / trol rod manipulations by the control room operator to restore the Axial Flux /

g[3[ / Difference to within limits. /

/1/4/ / /

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

/1/ff_ /B/ (28) /0/9/0/ (29) / NA / (30) /A/ (31) / Operator Observation /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ /2/ (33) /ZZ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) LZ/ (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 /////////////

NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8012100570 _-- -. .. .-.-.__- - - _ - . - . - - . - . _ . . . . . - - - .

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

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 80-087/03L-0 Description of Event On October 29, 1980, during startup testing, the Axial Flux Differ-ence (AFD) twice deviated greater than 5% from the target. The Axial Flux Difference was outside the target band for a total of 42 minutes, 8 minutes while at 90% power and 34 minutes while at a power below 81%.

Since penalty accumulations were less than 15 and less than 60 minutes, respectively operation was allowed to continue as per Action Statement a.1 and a.2 of T.S. 3.2.1. This event is reportable pursuant to T.S.

6.9.1.9.b.

Probable Consequences of Occurrence Surveillance of the Axial Flux Difference assures that the limits of the heat flux hot channel factor are not exceeded during normal operation or in the event of Xenon redistribution following power changes.

This provides protection against exceeding the DNBR and peak fuel clad temperatures. Since the AFD was returned to its limit within the time allotted, there was no effect upon the safe operation of the plant. As a result, the health and safety of the general public were not affected.

Cause Event The AFD deviations were the result of a 10% load swing and a 50%

load rejection from 100% power as part of the startup test program.

Immediate Corrective Action The control room operator restored the Axial Flux Difference to within the target band by power and control rod manipulations.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Reccurrence No further action is required.

Generic Implications There are no generic _ implications associated with this occurrence.

m

&-Wg@@ @m 4elesem e4 64 e pm gm-= " 4 m -' eha9 Mpa q ee e 6 Ww w ***-w@gg'w--=' ie m y