05000277/LER-1976-015, Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible

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Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
ML20086F836
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 03/05/1976
From: Ullrich W
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-76-015-01P, LER-76-15-1P, NUDOCS 8401090566
Download: ML20086F836 (2)
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LER-2076-015, Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
Event date:
Report date:
2772076015R00 - NRC Website
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text

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. - . - . o. . C .V. . '. ' N 'u' - . T. u' n' '. . '. 5 Confir=ing W. T. U11 rich's phrne ecnversstion with Mr. Walt 2sunach, l \!G11GillfiUUC21"lY Eeference: . 0 Oket 51=ber 31C-177 ClGM^!TDGLW!GGUTWGUtil2?L Unit 5=. 2 Report No.:

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2-76-15/1F 1

00 urrence late: Xarch  %, 1976

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Exceedei- Te:hniesl Specificatic 1.3.0.1 -

A11cvsble Gross A: ivity tGasecus) release rate for a shcrt peried of tire.

Ocniitions Frior  : Occurrence:

Un't 2 st% p ver sci "J n i  ? shutisvr.. Plant cscecus release ra e etcut 15.6% of Te chni cal Sp e c i.f i c a t i:n 111:vable. I Descriptien of D: urrence: i At 4: 50 p.=.

l. spikei -pvari.:n 3/L/76 the Unit 2 roof vent radiati:n 20nitors It was esti=ated quickly that it :ould have I
                          .exceedei Techni:s1 Spe ci fie st i:n licit s .

lt t Apparent Cause of 0: urrence: At 4: 00 p.=. On ?. ,' Lf76, the 2A EW10 filter iezinersli er was i ren ved vash was fr:= rervice started si to abcut be tschwashed 

                                                                                                       -:51 p.=. and                               Free sted.b The back-I                                                                                                                                he vessel was ler; ht *. led
        ;                   durinc. the interi=.                                         This 51 =inute hold a.n .n a r e n ". l y allovei sone of the Indice sissrbed en the.p: vier resin :: decay t: Xen n.   ~
                           ~4 hen the R W T.' vessel v s ta:ivsshed, the Xenon gares which had I

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           '               builtup in the vessel vere released tc the 1s:Evssh receiving t uns The tschwash receiving tant is vented t :~                                                                                he ventilati:n systen thr ugh a hEPA filter which allovs the csse s. : te re2essed fr:=

the 'n i t 2 ventilation s sch.

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                                                                                                                                                                                               .     # .4 e .z ts:kvn=h prc:edure was used.                                                               This new bschwash pr :eiare sprend
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s' ~ne ra.*..' . . ' *..-* e , ...- vs . . ~. ~. . - '-. a. I to the ft: ;r Of 5 increase in I0 dine Lose Equivslen: 2n the res:::r :::1 snt , the extended relea'se period vss n r. er.oush 

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the relesse, the St an ity las Tres:=ent Syste= vsa pls:ei in --.. .. i service the nnin ::sisek. relesseThis the cases fr = the inchwsah recei.v. ins innh s-red 2:et the peak release. 0401090566 760305

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To: Mr. J a= ti.st E .. 0c' R e111y ,. Di re ct o r - f.r*~. .Wk$ 1 

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SUBJECT:

lo e 2 c, REFORTWEEE: OCCURRENCE.- PROMPT *.NOTIFICrrION Reportv No . 2 76-15.tlP ~ There ver.e 3 spikes..which exceeded Technical Spe ci fi c at ion release 11=it. .The. peak instantaneous, release rat.e vas c alculat e d to be 1.89x10f uC1/see... This release rate is about 3 ti=es the l Technical S p e.c if i c at i:a n l i = i.t . The Unit 3 roof vent retained unchange d- d uring :the . period ef. release. The main sta:k increased when Standby Gas. Trent=ent.vas in service but never exceeded L5% of the Technicsl Spe ci ficat ion licit . The release rate vas above g the Technical Sp eci.fi c at ion. li=it. for about 55 =inutes. The total length of the, release.vas about 200 =inutes and it is esti= ate $ that 174.6 Ci vere released due-to this occurrence.. Initiat analysis of the particulate. filters and iodine e srt ri d.:e s 

                  . indicated no significant. increase in particulate Or iodine relense l

rates. An i sotopic analysis.vas run in s gas srgpie et;tained at g3 k cf. the reicase.. It i n di c a t.e d only X e ' -' ' , Xe, and Based on the fact t h a t. '.t he = c j e r =casured activ.ity were noble gases, the. effects f.ro=..this. release should be v.e r y =ini=al. i l Corrective Action: . The release vas s h o.r t. t erni in nature.;.no inmediate corrective action van possible. In the fut ure , the exhaust fro the RWCU i Lackvash Receiving Tank. vill be processed through the Standby Gas T r e ntre n t. . Sy s.t e . - This vill cini=ise the release unen a { RVCU filter de=ineralizer is'.being backvashed. t Failure D a tcc-: 2-iro-11/'IP ,. 2-7 6-12 /IP Very truly truly, ' 

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W. T. Ullrich, Superintendent 

     !           Peach Botto Ato=ic Fover Station i

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