ML19253A858

LER 79-048/03L-0:on 790815,during Review of GE Svc Info Ltr 299,determined That Trip Points for low-low-low Water Level Instruments Should Be Readjusted to More Conservative Setpoint in Order to Preclude Possible Instrument Errors

ML19253A858
Person / Time
Site:	FitzPatrick
Issue date:	09/07/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19253A855	List: ML19253A854 ML19253A858
References
LER-79-048-03L, LER-79-48-3L, NUDOCS 7909110551
Download: ML19253A858 (2)

Text

(7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) i e o i lNlY l J l A l F l 114 l@l'5 0 l 0 l - l 0 0 l0 l0 -

l0 l0 l0 l@l4 1LICENSE l1 l1TYPE l1JJ@l57 carl 58l@

7 8 9 LICENSEE CO, E LICENSE Nu' 5" h 26 CON'T

$C"C; &J@l 0 Is l0 l0 0 3 l3 l3 jg l 0l 8[ 1l sj 7l 9 Q j0 l 9l 0l 7l 7 l 980 @

o i

? 8 60 61 DOCK ET NUYBER Ed 69 EVENT D ATE 74 75 REPCRT D ATE EVENT DESCRIP'lON AND PROSARLE CONSEQUENCES h

[o l2l l Please See Attachment o 3l l O 3 l l f71T1 1 I 10 6 1 0 7 l l 0jH l l 7 8 9 80 SYSTEV CAUSE CAUSE COYP VALVE CODE CODE SUBCOCE CCMPONENT CODE SUBCOCE SUSCCCE 1o191 7 8 Ic lJ lg 9 10 11 x lg [

12 jg [I N SlT 13 R [ U lQ lE lg l :l g 18 19 2J

_ SE QL E NTI AL OCCURRENCE REPORT REVISION LED RO EVENT YE AR PEPORT NO CODE TYPE N O.

@ aEPOaT

_ 21 l7l9l 22

__l 23 74 0l4j8l 26 jfl 27 28 0 l3 l 29 lL l 30 l_

31 l0 l 32 ACTION FUTURE EFFECT S H UT D C/JN ATT A C H V E N T P.P R D-4 PRlYE CCvp. COYPONENT T 4,3 E N AC',!ON ON PL AN T 5 ETHOO HOURS SUButTTED FORMdVB. SUPPLI E R MANLFACTURER

'_J@l-l@

f 44 IZ 33 l@ l36Z I@ l01010 3/

I lY @

41 Nlg lNlg Y l0 l1 l0 lg 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i

o!l Please See Attachment [

t ijl 1 i /l i a l I li la i l l 7 8 9 80 STA S *.POWE R OTHER STATUS IS OV HY DlSCOVERY CESCRIPTION i l3 l G lg l0 0 'O

@ NA l l D [glNSSS Vendor (SIL-299) l A Tf VITY CO TENT nFLEASED CF RELE ASE AVOUNT CF ACTIVITY LOC ATION CF AE L E ASE NA 7

re L:J @ i :l@

8 9 10 11 44 l I 45 80 i

PERSC'.NE L E h POSUH E S NU V tie R TYPE DESLRIPTION i 7 l0 l0 0 [@l: l@l 1 l

7 8 9 11 12 13 80 F E R SO*.N E L i*: JURIES N US?B E R D ESCRIP flON Q "7

1. O i ,

l0 l0 l0 @l NA W d' ( W l 7 8 9 11 12 80 LOSS OF OR ON DA'/ AGE TO FACillTY @

Tye l i l o8 l9 l - l@l10 onCniPT ya

' 7909110 M i l 7 80 PUBt lCI TY r NRC USE ONLY

• 2 o iSSyNl E O@DE l SCRIP TION NA

[ ((tj[lllll lllj 7 8 9 'O 64 69 80 ;

NAVE OF PREPARER W. Verne Childs PHONE:

315-342-3840 3 o

POWER AUTIIORITY OF Tile STATE OF NEW YORK JAMES A. FIT:'. PATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACIIMENT TO LER 79-048/03L-0 Page 1 of 1 While in a cold shutdown condition, during a review of General Electric Company's Service Information Letter (SIL) No. 299 which is titled "High Dry-well Temperature Effect on Reactor Water Level Instrumentation," it was deter-mined that the trip points for the low-low-low water level instcuments should be readjusted' to a more conservative set point in order to preclude pos ible instrument errors as a result of certain hypothetical conditions.

The instruments set points were recalculated to account for a postulated change in water density in the reference column of Yarway compensated water level instruments during drywell ambient temperature rise associated witL certain postulated events. Each assumption used in the development of the final reference column temperature contains conservatism which results in new calculated set points which centain significant margin to the safety limit. These calculations were reviewed and verified for accuracy by General Electric. The discovery of the possible errors is considered to be a reportable event as defined by Technical Specifications Appendix A, Paragraph 6.9. A.

038003

-. --