ML19208B802
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UCENSEE EVENT REPORT Pa'lisades CONTACL SLOCtl l
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(pLEASE PAINT ALL REQUIRED INFORMATtoN) 1 6
NAME UCENSE NuMBEA T
TY E Il l l Ml Il Pl Al Ll1l 0l0l-l0l0l0l0l0l-l0l0l l h l1 l1 l1 l1l lhl3 7 89 14 15 25 26 30 31 32 P
RCE OCCXET NUMBER EVENT CATI REPcRT DATE 01CONTI*1*l W lL l l015l0l-l0l2l5l5 l 0l h l 1l9 l 7l7 l l 0l 5l 0l hl 7l 7l 7 8 57 58 59 60 61 68 69
.74 75 80 ELINT OESCAiPTION O2 l On Atril 6, 1977. vaste cas decay tank T-101A vas overtressured to 112 usi and over l
7 89 80
@ l the next 10 days, while isolated, the tank lost 10 psig resulting in a violation of 7 89 80
@ l Technical Specification 3.9.17.a.
Total gaseous release was 3.206 curies or.00076".
l 7 89 80 05 l of our yearly limit (pri=arily Xe-133).
No personnel exposures were involved.
7 89 80 Q l Activity was below detectability of the plant exhaust stack monitor.
(ER-77-23) 1 7 89 80 paus SYSTEM CAuSE COMpoNe47 COMACNENT CCCE CCCE COMPONENT CCCE SLPPLER MANUNCTUFER VOLATEN Q l uj a LA_I I zi z i ziz i z i zi IA Izi919191 1 71 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION g l Waste gas decay tank (WGDT) T-101A vas put into service with the pressure sig=a re-7 89 80 Q l =oved.
The high-pressure alarm is part of the signa. There is also a pressure re-l 7 89 80
] l corder which is inderendent of the siena.
On Arril 6, 1977 the volute control tank l
89 (Contd on Attached Sheet) 80 METNoa e, a
status s powEn l_D_l l0l0l0l l ShuEEcY.,n
- Hot l lal l
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S 11 c:%
v 7 8 9
10 12 13 44 45 48 80 nNo e ELEAsE aucuni cp AcTmTY tcCATcN or nELEAsE W
W l 3.206 Curies Total l
l Exhaust Stack l
12 7 8 9
10 11 44 45 80 PERSONNEL EXPOSURES 5
NUMBER TYPE CESCAPTcN
@ l0l0l0l 1l None l
7 89 11 12 13 go p @ (p rIU PERSONNEL INJUAIES NuueEn CEsCwT:cN
[y;n,;1U! u,IH l
l0l0l0l l
None 14 7 89 11 12 80
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IjlhI PROBABLE CCNSEQUE:TCES yl None Jiu i(0-ri3 ! ! l, ' ! -
l 7 89 80 LOSS OR DAMAGE TO FAC:UTY SSOOM TYPE CEsC w Tc" lZl l
NA l
1 7 89 10 80 7 9 09210c{q 79ggtu gq(
PUBUC!TY
@l NA l
7 89
{
80 ADCITIONAL FACTORS l Cause Description continued Cn attached sheet.
l 7 89 BO il9 l l
7 89 80
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LICENSEE EVEIIT REPORT Palisades Cause Description (Contd) was vented to the T-101A WGDT leaving the tank at 91 psig. The oncoming shift assistant operator (AO) asked the shift supervisor if he should isolate the tank. The shift supervisor replied ":To," and if venting was needed to monitor the pressure and recove tank from service at 95 psig per operating procedures.
At approdmately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />, the chem lab technician opened the volume control tank sa=ple valve and left open for approdmately two hours, increasing T-101A pressure by 21 psig.
The A0 noticed tank pressure at 112 psig and isolated the tank.. The tenk started leaking slowly almost i= mediately.
On April 10, 1977 the shift supervisor had the Maint Dept tighten the spring tension on all valves.
The leakage slowed down i= mediately at 102 psig; 1 psig was transferred when the tank vas sampled. The tank reached 101 psig on April 16, 1977 violating Technical Specification 3 9 17.a.
The loss of 9 psig over approximately 88 hours0.00102 days <br />0.0244 hours <br />1.455026e-4 weeks <br />3.3484e-5 months <br /> r~eleased 3.206 C1, primarily Xe-133, which is.00076% of the yearly limit.
Log sheets indicate that the activity was transferred to the new WGDT, T-68B, that was in service.
However, as the activity was below sensitivity of plant effluent monitors, it is hard to prove or disprove this absolutely.
390060
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