ML19263E203

LER 79-060/03L-0 on 790502:during Routine Startup Operation, Axial Flux Difference Deviated Greater than 5% from Target. Caused by Power Increasing Too Rapidly During Startup Operation

ML19263E203
Person / Time
Site:	North Anna
Issue date:	05/31/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263E199	List: ML19263E198 ML19263E200 ML19263E203 ML19263E207
References
LER-79-060-03L, LER-79-60-3L, NUDOCS 7906050298
Download: ML19263E203 (2)

Text

. .

17 77)

. . LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL FIEOUIRED INFORMATION) i e I O l 8i l9 I V l LICENSEE 7

A l N lCODE A l S l 141 l@l 15 0 l 0 l- l 0 l0 0 l0 l0 LICENSE NUMdEH l- l0 l0 l@l4l1l1l1!1lh!

25 26 LICtNSL TYPE JO l

51 CA T bd l@

CON'T O i 8

[gylLl@l0!5l0l0 013]318 l@lOlSIOl2l7l91@l0 15 l1 l1 l7 I4 l@ M 6) EVENT DATE 74 15 HE POHT DATE 80 7 60 61 DOCK E T NUM8ER EVENT DESCRIPTION AND PROH AHLE CONSEQUENCES h O 2 During a routine startup operatioi, the axial flux difference deviated creater rhw I 0 3 5% from target. A total of 2 penalty minutes was accumulated. Action Statement a.2 1 0 4 lof T.S. 3.2.1 allows continued operation between 85% and 50% power if the penaltv l lOlsi accumulation is less than 60 minutes, therefore T.S. 3.2.1 was not violated. This i O 6 event is reportable as per T.S. 6.9.1.9.b. This event did not affect the' health O 7 l nd safety of the general public. i O H l l 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SU8 CODE COMPONENT CODE SU8 CODE SUBCODE l0l9l lR lC l@ y@ y@ l Z l Z l Z l Z l Z l z l@ lZ l@ J @ 19 20 7 8 9 to 11 12 13 Id

,_ SEQUENTI AL OCCURRENCE REPORT REVISION LER Ro EVENT YE AR REPORT NO. CODE TYPE N O.

b ,REu T

_ 21 l7l9l 22 l-l 23 l0 6l0l 24 26 l/l 27 28 0l3l 29 l Ll 30

[---J 31 W

32 K N ACT ON O i PLAP T METH t HOU9S 5 i FOR 5 8. SUPPLIE R MAN FAC R EE R IJ3 X!@l34z l@ U@ W@

35 36 lolo 010 3i 40 l Y l@

41 42 Nl@ lZl@ lZl9l9l9l@

43 44 47 CAUSE DESCRIPTION AINO CORRECTIVE ACTIONS i O lThe cause of the AFD Deviation was too rapid an increase in power which occurred duriD2l li li l lstartup cperation. Corrective action was to secure Reactor Power increase and to in- I

, ., l sert control rods to bring the AFD to within the target band. No further corrective l

, 3 l action was required.

18 141 I }

7 8 9 80 STA S  %*CWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION NA Operator Observation 5

lC l@ l 0 l 7 l 5 l@l l lAl@l l A TIVITY CG TENT RELEASED OF RELE ASE AVCLNT OF ACTIVITY LOCATION OF RELEASE 8 9[Z]@ lZl@l i 6 NA l NA l 7 _ to 11 44 45 80 PERSONNEL D aOSLHES NUv4E:4 WM i e 10 l0 10 l@lZi@OGCmatON u I

' n RSONNJ',N a2iES

• NtJVRFR D ESCR l8 Ti O'.

NA 7

i a 8 9 101010 l@l12 11 60 I

LOSS OF OR D AMAGE TO F ACILITY ~

TYPE D E SCRIP TIO N l 9 [Z j@l_

NA y 8 9 10 60 PUBLICITY NRC USE ONLY O

2 O d E ISSU l D@DE NA SCRIPTION 7906 ~

i i i i i iiiiii iilj 7 8 9 10 68 69 80 &

NAME OF PREPARER

Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No: 50-338 Report No: LER 79-060/03L-0 Description of Event On 5/2/79, during a routine start-uppoperation, the Axial Flux Dif ference deviated greater than 5% from the target, a total of 2 penalty minutes was accumulated.

Action statement a.2 of T.S. 3.2.1 allows continued operation be tween 85%

and 50% power if the penalty accumulation is less than 60 minutes . Therefore, T.S. 3.2.1 was not violated.

This event is reportable as per T.S. 6.9.1.9.b Probable Consequences of Occurrence Surveillance of the Axial Flux Dif ference 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 wae no effect upon the safe operation of the plant. As a result, the public health and safety was not endangered. Since this was an operation event, it could possibly occur in Unit 2.

Cause of Occurrence The cause of the AFD deviation was too rapid an increase in power which occurred during startup operations.

Immediate Corrective Action Corrective action was to stop reactor power increase and to insert control rods to bring the AFD to within the target band. Close surveillance of the AFD continued until the plant was returned to full power.

Scheduled Corrective Action No further action required.

Actions Taken Ta ?revent Recurrence No action required.

2294 307