ML20085F678
| ML20085F678 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/20/1975 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Case E Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20085F681 | List: |
| References | |
| AO-50-259-754W, NUDOCS 8308230136 | |
| Download: ML20085F678 (2) | |
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...tri c tien,f Oc m rr ~ e Increc':e of dijuell ex c:en concentrction to >h percent.
Cc.-litionn Prior to 0-rurrc re i
Tno unit unn operating at cynroxintely 1,055 I~.le.
I;eceription of Occurrence 7.' nile runnin~ n routine curveill- '.ce tect en "r.rch 10, l'US, r.t npnroxinstePt 2115, the drr.: ell :mycen concentrntion una discovered to be approxinntely I
1 6 percent.
Ann': rent Cr_ure of Occurrence i.
The prircrry cont ti: cent uns inerted nt 0755 hours0.00874 days <br />0.21 hours <br />0.00125 weeks <br />2.872775e-4 months <br /> on L*.crch 6,1975, before goir; to the RU:: 1.of.e uith the renctor. Fe9 dings et that tir:e choved the oxygen a
concentrntion to be <h percent. The subcecuent incrense in oxygen concertration k
e-uncd b: r.inin~, of cir "nich tr '. been reteined in sternant uns appnrently creas of the dr"vell euch ne pipir.~ inculntion voids, during the initiol rur7e I:
In rddition, a clicht :ur e cirflou to the TIP cycten uns four! to h
nnd nonplinr,.
be contributing nrproni:.ctely 5 ECFli to the dr;r. ell, r
I Annlynic of Cecurrence
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There vere no rdverse effects to the public henith and nefaty as n result of thin l
occurrence.
Corrective Action None van found except The unit una chce':ed for cir inles>nge into the dry. cil.
the clir.ht parce nir to TII3.
The init.icl corrective cetion unn to requent a change to the technien1 creci:i-cationn which rould h^ve nlleve3 cufficient titc.e to conglete the purr,e ':ith the rer.ctor in the RG *.'o.ie.
F.en this requent uca denica tne unit unc chut doun at appronir ntely 2010 tuurc on I:crch 11, 1975, and nitre en introduced Tecdin~s tnhen to reduce the oxygen concertrrtion to within acceptable limite.
at 20hD hours on ISrch 11 irliented that the oxygen concentration unc neceptable, and the unit uns returned to service.
1 nonitor dryvell ntnorpherie conditionc nore frenlently follou3ng Uc vil:
inerting until certain that an equilibrium nixing co:rlition hr.s been established.
Failure Data None 8308230136 750320 PDR ADOCK OSOOOP59 S
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.r E'ne e.nclosed report in to pratitie detnila concerr.ing increcco of Ir
>ll c: 'cen concentration to >b nercent and in cubr.itted in ne 'r inr.ce uith /.pnen il:: '. tr :'e~uletor-- Guide 1.16, Tc ticion 1, Octaber 1973. Thic event occurred on 3rowns icrry Huclear Plent unit 1 on :'nrch 10, 1975.
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