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 un 4 2 4.IJEREEslloozlJEv P-77)

R CENSEE EVENT REPORT CONTROL BLOCK:

~,,6 1,, (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

~01 7 8 9 AZBR93Q200-00000" LICENSEE CODE '4 15 LICENSE NUhlBER O'OQ341111Q~Q 25 26 LICENSE TYPE 30 57 CAT 58 P

CON'T

~el 8 SOURCE

~Lyso 3 0 0 0 2 9 8 QP 1 2 1 8 7 9 Qs 0 1 1 3 8 0 Qs 60 61 DOCKET NUh'IBER 68 69 EVENT DATE 74 . 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

~02 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 Previous occurrencies: 259/772, 259/7326, 296/7910, 259/7824,

~07 296/7912, 296/797, 260/7917, 260/7916, 259/798.

~08 80 7 8 9 SYSTEhl CAUSE CAUSE COMP. VALVE COOK CODE SUBCODE Coh'IPONENT CODE SUBCOOK SUBCOOE

~09 7 8

~IA 9 10 Q11 ~X 11 Q42 ~Z 12 .

Q13 13 1 N S T K 0 18 Q4 ~S 19 QEE ~Z 20 QER SEQUENTIAL OCCURRENCE REPORT REVISION Qlz REPORT ACTION'UTURE FVENT YEAR

~79 21 22 EFFECT

~23 SHUTDOWN

~0-24 REPORT NO.

2 8 26

~m 27

~3 28 ATTACHhlENT COD6 29 NPRDX TYP F.

~L 30 PRIME COMP.

~

31 32 NO.

P~o COMPONENT TAKEN 33 ACTION

~Bpls ~X Q13 34 ON PLANT

~ZQ20 35 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 METHOD

~ZQ21 36 37 0

HOURS Q2~

0 0 0 40

~

SUBMITTED 41 p23 FORhl SUB.

~Q24 42 SUPPLIER

~L 43 pzs 44 IEIANUFACTURER 8 0 8' 47 Qzs 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 8 9 80

~

7 4 FACILITY METHOD OF

~I5 7 8 STATUS 9

8 Q23 ~07 10 98POWER 7 pzs 12 13 OTHER STATUS NA 'SQ31

~30 44 DISCOVERY 45 46 S1 Testis DISCOVERY DESCRIPTION 80 ACTIVITY CONTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q~~

Q33 2 Q34 HA NA 7 8 9 'IO 44 45 80 PERSONNEL EXPOSURES hIUMBER TYPE DESCRIPTION

~00 0 ~ZQEE HA 7 8 9 P EBS ONNE L 11 QTT

'2 INJUR IES 13 80 NUXIBER DESCRIPTIONQ4i

~OO O Q43 NA 7 8 9 'I l 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 43 3 IZ Q42 NA 7 8 9 10 80 PUBLICITY DESCRIPTION NRC USE ONLY ISSUED 43 44 3 ~HQ44 NA 7 8.9 10 69 80 o, 0

hIAME OF PR:.PARER PHONE'8 L

,1 K

J

.'Tenne sse Valley Authorit Form BF-17

.Prowns Ferry Nuclear Plan& l~r P l/10/79 LER SUPPLENENTAL INFORMATION BFRO 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 drift.

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 has been approved to change the system to an analog system.

it drifted again. DCR 1398 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~