05000259/LER-1982-089, Updated LER 82-089/03T-1:on 821103,primary Containment Purge Sys Failed to Achieve Required Flow Rate.Caused by Sand Dust Clogging HEPA Filters.New Filters Installed

Updated LER 82-089/03T-1:on 821103,primary Containment Purge Sys Failed to Achieve Required Flow Rate.Caused by Sand Dust Clogging HEPA Filters.New Filters Installed

ML20073C647
Person / Time
Site:	Browns Ferry
Issue date:	04/08/1983
From:	Mulling K TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20073C623	List: 05000259/LER-1982-089, Updated LER 82-089/03T-1:on 821103,primary Containment Purge Sys Failed to Achieve Required Flow Rate.Caused by Sand Dust Clogging HEPA Filters.New Filters Installed
References
LER-82-089-03T, LER-82-89-3T, NUDOCS 8304130245
Download: ML20073C647 (2)

LER-2082-089, Updated LER 82-089/03T-1:on 821103,primary Containment Purge Sys Failed to Achieve Required Flow Rate.Caused by Sand Dust Clogging HEPA Filters.New Filters Installed

Event date:
Report date:
2592082089R00 - NRC Website

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fy f . ,' . 0 2 UPDATEREPORT-PREVIOUSRFPORTDATE12!OR LICENSEE EVENT RE ,

(PLEASE PRINT OR TYPE ALL REQLilRED INFORMATIONI CONTROL BLOCK: l 1

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7 9 LICENSEE CODE CON'T 10111 7 8

"'I[RcE 3 "' l 60 Ll@l 0l S l DOCKET 61 0l 0NUMBER l O l 2 l S68 I 969 @lEVENT I l 110DATE l 3 l 8 \ 2 ]@l 74 75 REPORT 0DATE l 4 l 080l 818 l 3 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l

i 10121 l Durine n nnintonnnce nurnen nfenr vnncene scrnm. uhilo norformine ST 4.7.F.1 ,

10131 l (Primary Containment P_Jge System Filter Pressure Dron Tent) . the primary centainment l

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l ilO l d t I nurce system failed to achievo the reoufred flow rate of 6000 CFM - 107 lOI5ll ( T. S. 4.7.F.1). There was no dancer to the health or safety of the public. The I I

f lO161l 2 dundnne nenndbv ens fronemont system una available nnd onernble.

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10181I so SYSTEM CAUSE CAUSE COY P. VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUSCODE 10196 l Sl cl@ Lxj@ Lt]@ lr i T IT l m I v l a l@ LzJ@ LzJ 18 19 20 h 9 10 11 12 13 7 REVISION SEQUENTI AL OCCURRENCE REPcRT EVENT YE AR REPORT NO. COOE TYPE N O.

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,,,, 21 22 K[ AC 0 ON PL NT MET isOURS S8 FOR l b 8. 5 PPLIE MAN FACTURER

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is- 3i 34 3s a 37 *o 41 42 43 44 47 CAUSE DESCRIPtlON AND CORRECTIVE ACTIONS h -

f 1 ( c l ~l The HEP A filters (MSA model B-SK-174 3-1098-1 T unro cincond ufeb n nnedorv enbeennna that prevenCed achieving the design flow rate. Laboratory analysis confirmed this  ;

substr.nce t a be sand dust, mOstprobably from sandblasting. New filters were installed y

] and satisfactorily tested. The unit 3 HEPA filters were flow checked on January 10. I i 3 l

l 14l l 19 3. No'further recurrence control is recuired. _

80 7 8 9 ST S  ; % POWER OTHER STATUS Dis Y DISCOVERY DESCRIPTION l1 l5 i W h [0j0l0lhl NA l (,D_jhlTnserviceinspection l ACTIVITY CO TENT RELEASE CF RELEASE AMOUNT OF ACTIVITY LOCATION OF c1ELEASE Qda 7 e . [h!

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PERSONNEL EMFOSURES NUMBE R TYPE DESCRIPTION l

i Ldz] I 0101 Ol@l12 zi@l

'fi'8 9 11 11 NA 30 FERSONNE L INJUHIES NUYBER DESC3 tP TION b l 80l0 7

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4 LOL M OR 4;AMAGE TO FACILITY I TYPt DE St olp T 80N

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, 7- 10 (205) 729-0834 b 11AME OF PREP ADER

• " "N PHON E:

f, Tcnn:ssee Valley Authority o Fcrm BF 17

.'. *, Browns Fcrry Nuclear Plant -

BF 15.2 2/19/82 LER SUPPLEMENTAL INFORMATION

< BFRO 259 / 82089 R1 Technical Specification Involved 4.7.F.1 Reported Under Technical Specification 6.7.2.b.(4) x Date Due NRC

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Event Narrative:

- Unit 2 was in a refueling outage, unit 3 was operating at 99-percent power.

Neither was affected by this event. Unit 1 was in a maintenance outage.

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Surveillance Instruction (SI) 4.7.F.1 was performed on the primary containment-

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purge system. Technical. Specification 4.7.F.1 requires the pressure drop across * .,

the combined HEPA filters and charcoal absorber banks shall.be demonstrated tot f;'if

. less than 8.5 inches of water at system design flow rate plus or minus J7 10 percent. The required design flow rate (6000 CFM ) could not be achieved.

ThepressuredropacrosstheHEPAfilterswasnigherthannormalbutlessthan}j',

8.5 inches. The HEPA filters (MSA Model B-SK-1743-1098-1) were removed and '

l rt inspected. No damage was found but the HEPA filters were clogged with a -.

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powdery substance. This material on the HEPA filters prevented achieving the required flow rate. Prim'ary containment was visually inspected for the source ,

- of the powdery substance. Nothing was found. Laboratory analysis confirmed the' powdery material to be sand dust, most probably resulting from sandblasting -

operations associated with previous torus modifications. The redundant standby gas treatment system was operable. There was no danger to the health and safety of the public. No problem was identified on unit 2. The unit 3 HEPA filters were flow checked in January 1983 ei ,

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• Previous Similar Events: .

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BFRO-50-259/ 82029 -

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