ML19345G087
| ML19345G087 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 08/02/1977 |
| From: | Carroll J PACIFIC GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-77-02, RO-77-2, NUDOCS 8103020163 | |
| Download: ML19345G087 (2) | |
Text
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1Cf N5f t Lcf NM EVENT NAME LclNSE NUMD(A TYPE Tv64 IclAlalsialli 10101-101010101 01-10101 l 4l 1 I l l il il 10111 01 7 89 14 15 25 26 30 31 32 CATE GC AY TP S
DOCA t t NUMBE A EVENT DATE AEPoAt CA!!
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[L_j l0 l 5 l 0 l-l 0 l ll 3l 3l l0 l7 l 2 l 2 l 7l 7l l 0] 8l0 l 2 ! 7 l 71 7 8 57 58 59 60 61 68 69 74 75 BC EVENT DESCA:PTON mi l On July 21 and 22, an unconieored radioactive liquid release to the effluer.t canal 8
7 89 eg 3E l occurred involving less than 2000 callons or' concentrated waste containing Cs 137 7 89 g,
EE l n~4 Cs 134.
The cencentration followinn dilution in the effluent canal was less than I
7 89 The radwaste concentrator, which was the major source of the 6:
05 l 9.7 x 10-* LCi/ral.
7 89 E't EG l liriuid was secured, the drain pit to canal valve was closed and repairs to the 7 89 6;,
m,g Sv5f tp CAvSE CCvocadNT Couo0NENT (Cont.)
CODE CCOE COMDONENT CODE SLP*LER MANUF ACTU8E R VOLATON 07 lMIAl (_FJ l1151SiTi al t' l W
I AI 612 l si i N; 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRiPT:ON 3
l Prior to or shortiv following the startup of the radwaste concentrator, the 1
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radwaste sump pump auto start switch (Autocon Floatrol) and level alt.rm 7 89 5,
l (Magnetrol A 152 Sp-S53) became or were inoperable due to corrosion buildun 1
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e Ac uf,
urinoo es Status
% DO*VIA OTMLA Status D.SCOVEnv DSCOvf Av LESCASTON d
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Visual Observance l
1 7 8 9
10 12 13 44 45 46 63 sCmM os ACTfviiv COY E N T RELIASED C5 Hisit 5I AMCUNT CF ACifV:T v LOCAtac% Cr Aitfi.5E d
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lRadwaste floor drain to On-Site r.ffitentj 1
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10 11 44 45 Canal to Humboldt oay a0 PERSONNEL EXPCSURES Nuvain t v uE DESCsaicN DE 101 0101 LU l
NA
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\\{h 7 89 11 12 13 83 PERSONNEL 6NJUR:ES Q
kUM6L A Lt SCh DT C%
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NA 14 7 89 11 12 gW) u
6; OFFS. E CONSEQULNCES 15 l None l
7 89 Bs LOSS OR DAMAGE TO FACILITY TYPE Ct hCW ON l
NA J
1 7 89 10 BU PUBLOTY
$l No press reicase - Radio, TV and Newspaper's ouestions answered on individor.1 basis.l 7 LJ B 6;
ADO;TONA;. F ACTORS 1e l I
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Nwt J._ C. Carroll r.<. r
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EVENT DESCRIPTION (cont)
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radwaste sump pump controls and the tankage area drain to sump valve were made. Operating, maintenance and testing practices associated with this system will be reviewed for possible changes. This is not a repetitive occurrence (LER 77-02).
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CAUSE DESCRIPTION (cont)
(the concentrator drips drain to the sump).
The sump filled and should have overflowed, but the closed drain valve from the tankage area drain pit to the sump leaked due to a damaged seat
, (4" Clow F-3075). The waste then ran through the open drain pit to effluent canal valve and resulted in the release.
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