ML20084E089

AO 50-244/74-21:on 741211,boric Acid Tank Level Transmitter LT-171 Dropped to Zero Level Indication.Cause Not Stated

ML20084E089
Person / Time
Site:	Ginna
Issue date:	12/11/1974
From:	Lang L ROCHESTER GAS & ELECTRIC CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20084E086	List: ML20084E084 ML20084E089
References
AO-50-244-74-21, NUDOCS 8304140072
Download: ML20084E089 (1)

Text

r- v 1

\

V t s, ,3..

' : ' ,,c.

I.'UCil'iSTER GAS M*D ELECTRIC CORPORATIO.'l e C9 ElST AVEilUE, ROC!' ESTER, !!.Y.11649

,,u ..on.

==sa cot,c na S tu.2 700 Ginna Station December 11, 1974 Mr. James P. O'Reilly, Director -%s % '

Directorate of Regulatory Operations ,s,.\ ).

Region I *

's U. S. Atcmic Energy Commission [ -i ' I ,d 631 Park Avenue h/ h(.l v i' y F1 p

King of Prussia, Pa. 19406 j. .

g},.6 _

j

'p..w -( * '

L.:f

' e\ $ Tg=:

Subject:

Abnormal Occurrence #74-21 '/$-

d s .m- .m, Failure of a Level Transmitter on the '

s ~

127, Coric Acid Sys tem 1 93 ,. .

Ginna Statica Dceket No. 50-244

Dear Mr. O'Reilly:

At approvie.ately 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br /> on December 11, 1974, Boric Acid Tank level transnitter LT-171 fciled by suddenly dropping to zero level indication. The less of the transmitter is considered as the loss of a redundant feature in a scfety syctem and-ic being reported as an Abnormal Occurrence by Technical Specification definition 1.9d.

Each Boric Acid Tank has tro level transmitters which send signals to opening circuits of the Boric Acid Tank Outict Valves (826 A,B,C and D). These valves will open on a S.I. signal, as long as the level transmitter indicate levels greater than 107.. Ufth the loss of LT-171, one part of the opening logic is receiving a closing signal. The opening logie, consists of one out of the two level signals from cach tank,will provide a signal to open all f our valvos. As long as the other trar.:nitter of the Eoric Acid Tank with the f ailed transmitter, operates correctly,127, Boric Acid would be supplied as required by a S.I. signal.

Very truly yours, O C h.T_. - (Mh@

Lcc S. Lang b#

Assistant Superintendent cc: Mr. J . I'. O ' Leary, AEC M r . G . J . Swa r th ou t , RGE Mr. L. D. White, J r. , RCE 8304140072 741220 b PDR ADDCK 05000244 S PDR COPY SENT REGION Y '

.