ML18024B262

LER 79-028/03L-0:on 791218,while Performing SI,PS-3-74A & B & PS-68-95 (Reactor Pressure) Did Not Actuate at Correct Setpont.Caused by Drifting of Barton Model 288 & Barksdale B2T-M12SS.Switches Readjusted

ML18024B262
Person / Time
Site:	Browns Ferry
Issue date:	01/15/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B260	List: ML18024B259 ML18024B262
References
LER-79-028-03L-01, LER-79-28-3L-1, NUDOCS 8001210215
Download: ML18024B262 (4)

Text

NPC FORi4113GG u.a.lsus Lcssn zsclzuz.ss 4 un 2 4.IJEREEslloozlJEv P-77)R~01 7 8 CON'T~el 8~02 CENSEE EVENT REPORT CONTROL BLOCK: 1,, (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

~,,6 AZBR93Q200-00000" O'OQ341111Q~Q 9 LICENSEE CODE'4 15 LICENSE NUhlBER 25 26 LICENSE TYPE 30 57 CAT 58 P~Lyso 3 0 0 0 2 9 8 QP 1 2 1 8 7 9 Qs 0 1 1 3 8 0 Qs SOURCE 60 61 DOCKET NUh'IBER 68 69 EVENT DATE 74.75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 During normal operation while pexforming ST.4.2.B-7, PS-3-74AM'nd PS-68-95{Reactor Pressure)did not actuate at the correct setpoint as required by T.S.3.2.b.

Opexable redundant systems wexe available.

There was no hazard to the public health or safety.~os~07 Previous occurrencies:

259/772, 259/7326, 296/7910, 259/7824, 296/7912, 296/797, 260/7917, 260/7916, 259/798.~08 7 8~09 7 8 9 80 SYSTEhl CAUSE CAUSE COMP.VALVE COOK CODE SUBCODE Coh'IPONENT CODE SUBCOOK SUBCOOE~IA Q11~X Q42~Z Q13 1 N S T K 0 Q4~S QEE~Z QER 9 10 11 12.13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION FVENT YEAR REPORT NO.COD6 TYP F.NO.Qlz REPORT~79~~0-2 8~m~3~L~P~o 21 22 23 24 26 27 28 29 30 31 32 ACTION'UTURE EFFECT SHUTDOWN ATTACHhlENT NPRDX PRIME COMP.COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q2~SUBMITTED FORhl SUB.SUPPLIER IEIANUFACTURER

~Bpls~X Q13~ZQ20~ZQ21 0 0 0 0~p23~Q24~L pzs 8 0 8'Qzs 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 A Barton model 288 and a Barksdale B2T-Hl2SS had drifted.The switches were readjusted, functionally tested and returned to service.A modification has been approved{DCR 1398)to replace the switches with an analog system.I 45 7 8 9 FACILITY~30 METHOD OF STATUS 98POWER OTHER STATUS~DISCOVERY~I5 8 Q23~07 7 pzs NA'SQ31 S1 Testis 7 8 9 10 12 13 44 45 46 ACTIVITY CONTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY Q33 2 Q34 HA NA 7 8 9'IO 44 PERSONNEL EXPOSURES hIUMBER TYPE DESCRIPTION

~00 0 QTT~ZQEE HA 7 8 9 11'2 13 P EBS ONNE L INJUR IES NUXIBER DESCRIPTIONQ4i

~OO O Q43 NA DISCOVERY DESCRIPTION LOCATION OF RELEASE Q~~80 4 80 80 80 7 8 9'I l 12 LOSS OF OR DAMAGE TO FACILITY 43 TYPE DESCRIPTION 3 IZ Q42 NA 7 8 9 10 PUBLICITY ISSUED DESCRIPTION 3~HQ44 NA 7 8.9 10 hIAME OF PR:.PARER PHONE'8 69 NRC USE ONLY 80 80 43 44 80 o, 0 L

,1 K J.'Tenne sse Valley Authorit.Prowns Ferry Nuclear Plan&Form BF-17 l~r P l/10/79LER SUPPLENENTAL INFORMATION BFRO-50-296/7928 Technical Specification Involvef'ate of Occurrence 1~218/79 Time of Occurrence 0800 Unit~Identification and Desc~ri tion'of Occurrence:

During SI Testing PS-3-74 A&B and PS-68-95 did not actuate at the correct setpoint.Actual trip points: PS-3-74A SWIPl=227.0 PSI, SWN2=444 PSI (TS limits SWgl=243.57+/-15 PSI, SW82=463.57+/-15 PSI): PS-3-74B SWIPl=215.0 PSI, SW82=478.0 PSI (TS limit SW81=243.57+/-15 PSI, SWN'2=463.57+/-PSI): PS-68-95 SW81=207PSI, SWIP2=432.5 PSI (TS limit SW81=234.3+/-15 PSI, SWN'2=454.3+/-15 PSI).Conditions

'P~ior to Occurrence:

U-1 85.5%U-2 Shutdown U-3 77%Action specified in the Technical Specification Surveillance Requirements

".iet due tenno erabie e ui>ment.Describe.Instruments were recalibrated immediately.

No shutdown action was required.l Apparent Cause of Occurrence:

Instrument drif t.Analysis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or injury and no danger to.health or safety of the public.~Corrective Action;Ihstruments were readjusted.

An increased monitoring for 1 week was xnxÃzafe~The Barksdale switch was replaced after it drifted again.DCR 1398 has been approved to change the system to an analog system.Failur~Data: 259/772, 259/7326, 296/7910, 259/7824, 296/7912, 296/797, 296/7917, 296/7916 and 259/798~Retention:

eriod-Lfetime; Responsibility

-Administrative Supervisor I i C~