ML20028G621

LER 83-002/03L-0:on 830112,primary Purge Sys Failed to Achieve Required Flow Rate of Greater than 10% of Design. Caused by Filter Internals Clogged W/Sand Dust from Sandblasting.New Filters Installed

ML20028G621
Person / Time
Site:	Browns Ferry
Issue date:	02/10/1983
From:	Mcpherson B TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028G616	List: ML20028G615 ML20028G621
References
LER-83-002-03L, LER-83-2-3L, NUDOCS 8302170148
Download: ML20028G621 (2)

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EVENT DESCRIPTION AND PROSABLE CONSEQUENCES l 0 l2 ] ] During a maintenance outane af ter reactor scram. while nerformine RT 4.7_v. 5 h

I l0l3]l (Primary Containment Purge System Flow Test). the primary containment purge system l l 0 l4 l l f ailed to achieve the required flow rate of +10-percent of design (6000 cfm) l l o 15 l 1 (.'echnical Specification 3.7.F. 2.c) . There was no danger to the health or I l0 l6 ll c:n f ety of the nublic. The redundant nenndbv ens trentment nystem was l l017ll available. l I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l110l1The HEPA filters (MSA model B-SK-1743-1098-1) we*e insnected. No dnmnne uns l l1Iillfound, From nast exnerience. it is believed thnt the filter intornn1= unra l l i l 2 l l c tngged with anna Ance frnm ennahinceino wu f41 tnvg unen 4 n g e n 11mt I l_i l 3 l l and satisf actorily tested. This was a random event and no recurrence control is l I i I 4 l l recuired , l STAT S  % POW E R OTNER ST A TU S D,8COVERY D SCOVE RY DESCRIPTION I 1l 5. l, l G l @ l 0 l 010 l@l NA I b2]@lTnnervice Inspectinn I

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NA l lllllllllllll NAME OF PREPAHER B. R. McPherson PHONE. (205) 729-0867

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• -BF 15.2 2/10/32 LER SUPPLIO1 ENTAL INFORMATION -

BFRO-f,0- 296_ / 83002_. Terhnical Specification involved 3.7.F. 2.C (4. 7.F.1) i .

Reported Under Technical Specification 6.7.2.b.(4)

• Date Due NRC 2/13/83 1

2. vent Narrative:

f Unit 1 was operating at 97 percent power; unit 2 was in a refueling outage; and unit 3 was in a maintenance outage. Only unit 3 was affected by the event.

Surveillance Instruction (SI) 4.7.F.5 was-performed on the unit 3 primary containment purge system, per the commitment made in LER response BFRO-50-259/82089 The maximum flow rate attained was 4245 cfm, which is not within the required 10-percent of the design flow (6000 cfm) as specified by Technical' Specification 3.7.F.2.C.

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1 The HEPA filters (MSA model B-SK-1743-1098-1) were removed and inspected.

No damage was found. New HEPA filters were installed and satisfactorily tested. Based on past experience, it is believed that sand dust from the sandblasting operations associated with the torus modifications of the previous refueling outage had clogged the internals of the HEPA filters.

The redundant standby gas treatment system was operable. There was no adverse effect on the health and safety of the public.

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?~ /icu.. Similar Events: .

BFRO-50-259/82029, 82089

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