ML18024B524

LER#78-090/03L-0 on 780914:channel 1L-538 Read Higher than IL-539.IL-538 Was Found to Be Out of Tolerance & Appropriate Bistables Were Tripped.Caused by Steam Leak on Root Valve (3/4 Inch Manual Globe)On Sensing Line

ML18024B524
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	10/13/1978
From:	Rogers C COMMONWEALTH EDISON CO.
To:
Shared Package
ML18024B523	List: ML18024B522 ML18024B524
References
LER-78-090-03L, LER-78-90-3L, NUDOCS 7811240213
Download: ML18024B524 (2)

Text

Intli I IJIINI JIIII U. S. NUCLEAR REGULATORY COMMISSION

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,/ LICENSEE EVENT REPORT CONTROL BLOCK:

I 0 I (17LEASE PRINT OR TY 'E ALL REQUIRED INFORMATION) 7 8 9 ZJz 1 LICENSEE CODE S 1Q>>

14 15 0 0 0 0 0 0 LICENSE NUhIBEII 0 0 25 Q3 26 4 1 1 LICENSE TYPE 1 1 30 QR~Q 57 CAT 58 CON'T

~01

't ~ 8 SIOUBCE ~L 60 0 61 0

DOCK ET NUI>IB5 B 68 Ol69 9 1 EVENT.DATE 4 7: 8JQB 74 75 1 0 1 3 REPORT DATE 7 8 80 QO EVENT DFSCRIPTION AND PROBABLE CONSEOUENCES QIO

~o Durin normal o eration o erator noticed Channel 1L-538 readin hi her 3 than 'L-5 39 ~ Investigation found 1L-5 38 out of tolerance and the appro-

~o~ riate bistables were trip ed. This drift is non=conservative for the

~os FS/FW mismatch with low 8/G level and the low-low S/G level, reactor trip

~os as resented in Table 3. 1-1 of the Tech. Spec. Redundant channels were

~37 available and operable. The health and safety of the public were not affected. (Previous LEE's: 50-295/78-88 and -70)

~ 7 8 9 80 SYSTEhl CAUSE CAUSE COMP. VALVE 7 8

~TA 9

CODE 10 Q11 CODE 8

11 Q12 SUBCODE L~AQ13 12 SEQUENTIAL 13 V

COMPONENT CODE A L V E X Qn OCCURRENCE

'18 SUBCODE

~Q13 19 REPORT

~Q SUBCODE 20 REVISION Qrr LERIBO Rr>onr ACTION FUTURE EVENT YEAR

~gg 21 22 EFF ECT

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23

~

SHUTDOYIN

~p9 24 REPORT NO.

0 26

~~

27

~03 ATTACHMENT 28 CODE 29 NPRDP TYPE

~L 30

~31 PRISIE COhIP.

~0 32 NO.

COMPONENT TAKEN ACTION OV PLANT METHOD HOURS Q22 SUBhIITTED FOBhl bUB. SUPPI,IER MANUFACTURER

+CGR+CQSR 33 34

+ZIQFR 35

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36 37 0 0 0

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0 40 41 N'Qzz +TQzn 42

+AQ 43 44 E 0 3 7 47 GR CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 o The cause of the channel out of tolerance was a steam leak on the root valve 3 4" manual lobe on the sensin line to the transmitter. This valve was re laced durin the on- oin refuelin outa e with a hi her 3 ressure rated valve. Other root valves of this t e'ill also be re laced with hi her rated ones. No further action required.

.7 8 9 80 FACILITY STATUS  % PO'LVE R OTHER STATUS Q DISCOVERY DESCRIPTION Q32 EQR ~OS 3QR NA ~AQ31 t Operator Observation 7 7 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF IIELEASE AMOUNT OF ACTIVITYQz

LOCATION OF RELEASE QS 8

LiJ 9

Qzr 10 z Qzn NA 45 NA 7 44 80 PEBSO>4NEL EXPOSURES NUt>IBFB TYPE DESCRIPTION 7 ~00 OJQ37 Z Q33 NA 7 8 9. 11 PEBSOtf NE L INJURIES 12 13 80 NUMBEfl DESCRIPT IONQ4 3 ~00 JOQRR NA 7~ 8 9 11 I? 80 LO~S OI Otl fthht>AGE TO FACILITY 43 7 Yf'F. I)ESCflIPTION D~Z8 9 Z Qn:.

10 NA 7 ~ 80 PUIII ICITY NRC USI'. ONLY ISSUEI1 IIESCfliPTION Q~

2 0 ~NQI 'NA 8 9 Ill 68 69 80 g NnME OF I RrzPAIIrtn C. L. Ro ers PIIDI~E.

312-746-2084 X-244

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