ML19253B866

LER 78-028/01T-0:on 780908,during Calibr of Sodium Hydroxide Tank Level Transmitter as Part of Refueling Interval Surveillance,Tank Was Found in Contain Excess 215 Lb of Sodium Hydroxide.Caused by Transmitter Calibr Drift

ML19253B866
Person / Time
Site:	Three Mile Island
Issue date:	09/22/1978
From:	Stanley W METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19253B865	List: ML19253B864 ML19253B866
References
LER-78-028-01T, LER-78-28-1T, NUDOCS 7910310613
Download: ML19253B866 (2)

Text

NRC FORM 366 5. NUCLE AR R 'iULATN / COMMIS$10N (774 LICENSEE EVENT REPORT CONTACL SLOCK: e 1

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(PLEASE PRINT OR TYPE ALL REQUtRED INFORMATION)

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REPCRT O ATE EVENT OESCRIPTICN AND PRC8ABLE CCNSECUENCES h oi2 l luring nor=al cperatien, while calibrating a sodiu= hydrexide tank level transmitter l 3,3  ; (:CCR) as part of a refuelir.g interval surteillance, the tank was fou=d te centain l

, , l 17,215 # cf sediu= hydrexide in viciatien of T.S. 3.3.'. 3b. Maxi =us allevable li=it l c,3, ,is 17,000 f. The excess 215 # veuld have raised the pH cf the Reactor 31dg. spray l

, 3 ;solutien slightly if the spray had been required to =itigste the :ensecuences of a l 3g, ;10CA. ~'his event posed no threat te the public 's health and safety. l ta e i I 80 7 4 3 SYSTEM CAc5E CAUSE CCMP VALV E COCE CODE SLSCCCE COMPcNENT CODE SLBCODE SLBCCCE ola l s i g l O tr_J@ L7.J @ l ' i n i = I - I = l " I@ l - l@ l -I @ 20 7 8 9 to 11 12 12 18 19

_ $ E CU E N TI A L CCOUARENCE RE*CRT REvisiCN lea a EVENT VE AR RE8CRT NO. CCOE TY PE NO.

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l 7131 l-l 01 21 91 l/l l o 11 I I Tl I-l 10 I

._2 i 22 22 24 ;6 v 2s 22 20 ai 22 ACTION . FUTURE E88ECT SMUTOCwN A TT ACHM E N T NPa o.4 setME COMP. COMPONENT TAKEN 4CTICN c *uNT vETwoo ocRs .. st auiTTEo acRM >ve. sureu tR vANLFACTuaER l Zl@ l 0l 0 0l 0l lY@ l42:I l@ l3l0lhl5l@

l22E l@ 24Gl@ l Zl@ 23 26 v 4o si l42:T l@ u 47 CAUSE CESCRIPTION AND CCRRECTIVE ACTONS h i a l Leaky C-rines allevine water to tass to the der side of the Cro reducine *be e+ M i i i Idelta ?, and calibratien drift resulted in lov :Cro rendine. 0-r ' m -a# a ~ ~ A a-d I i ,

l:CCR recalibrated. Tank level was returned to stee within an hcur of crerer Cr"e e nar-i i 3 lati:n deter =ination. Surv. proc . v111 te revised to have :CCR cleaned and C-rines l 3 .i l replaced on a refuelin interval. _

l 7 8 9 90 F 4CILITY VETWCD C8 STATVs  % POWER OTHER STATUS h*/

%., DiSCQvtRY OISCOVERY OESCRIPTION *

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ACTIVITY CONTENT AMCONT OF ACTIVtTY LCCATICN CF RELEASE 1 6 lZl agtgA$E@DOFRELEASE :TA l l l *iA l 7 8 9 10 tt 44 45 80 PEP iCNNEL EXPCSURES NUMSER TY'E O E SCRIPTIC N =

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LCSS CF C A DAMAGE TO FACILITY Tvet O E SC Rl871C N 7

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NAME 08 PAEPARER g* 3* e*anlar ~* ' #wCNE.

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7910310

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During ner=al operatien, while calibrating a sedi= hydr 0xide tank level trsns=itter as part of a refueling interval surveillance, the tank vas f:und to contain 17,215 pcunds of sedi= hydroxide. Sis is in viciation of Tech. Spec. 3.3.1.3b, which specifies a range of 16,0C0 to 17,000 pcunds of sedi= hydroxide.

In event of a LCCA, the centents of the sodiu= hydroxide tank are necessary to control the pH of the Reactor Building sprsy system solutien. The excess 215 pcunds of sodium hydr 0xide veuld have raised the pH Of the sprsy solution slightly if the Reactor Building spray syste= had been initiated. ~his event pcsed ne threat to the health and safety of the public.

~he event occurred because of calibration drift and because water leaked past C-ring seals to the dry side of the trans=10ter, reducing the actual pressure difference scrcss the trsns=itter, thus yielding a lover level reading than actually existed. The C-rings were replaced and the trscs=1tter was recalibrsted.

Witnin an hour of determining that the trans=itter was opersting properly, the sedius hydrcxide tank level was restored to within Tech. Spec. li=its.

50 R,

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