05000277/LER-1976-011, Telecopy LER 76-011/01P:on 760219,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible

Telecopy LER 76-011/01P:on 760219,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible

ML20086F840
Person / Time
Site:	Peach Bottom
Issue date:	02/19/1976
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-76-011-01P, LER-76-11-1P, NUDOCS 8401090581
Download: ML20086F840 (2)

LER-2076-011, Telecopy LER 76-011/01P:on 760219,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:
2772076011R00 - NRC Website

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~ In less than 10.=inutes the enleviated Unit 2 rdor v e r.: relcane rate vac leks.than 7echnicci Specifiention~-

limitc. 1he total length ~ of ti=0 that t ~g re Unit 2 ronr vent relesse este was higher than nar=e1 less than 63 =1ns.

Initial enslysis of the particulate 'f i l t e r s and Icdine ~

cartirfages indicated no signifiennt increase in particulate or iodine release rates. An iscropic analysis'was ran on a gas sanple obtained during the relcace (about thc 391dp int of the release,. It indicated only Xe 135 and Xe ' ' ' , in s 1.62 to 2 ratic.- It was estimated ,that the activity released

'd u e ta this spite vss about 20 cures .(basec on Gross Sadisti.

Roof Vent Monitor Reacings).

The release calestions for roof vent releases contain an MPO of 3.3.33 201/cetE 10 =in old off cas =ixture per T e c h t. i c s 1 Spe ci fi c ation. However, i r, this case the =ost liciting ?.? for the =ajor activity vcuid be 3N7 30irce.

If tne ::st li=iting MPC of activity measured is aces in the

! releace esiculation , e '

the Tecnni:El Specifiestien release li=it is -

.pbxceede:.

i based an tr.e above, the short ter= lenrtn ;f the release sno the fact that the =sjor messures activity. vere neble I

P. anes. %he effects frco t t. i s resence shouli be very cinical.

Corrective Action:

7 t.e release was shsr; term in nature; no i==ediate orrectise s.c t i o n was possible.

l Failure Data:

• N:ne Sinilar.

Very t ruly ycurs .

W. O. U1. rich, Saperintendent Fenen Ectta= Ato=ie Power 4:ation 1

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