05000296/LER-1980-047-03, /03L-0:on 801108,during Normal Operation, Difficulties Encountered While Trying to Determine EECW Flow to 3B & D Core Spray Room Cooler.Caused by Biofouling,Silt Accumulation & Corrosion

/03L-0:on 801108,during Normal Operation, Difficulties Encountered While Trying to Determine EECW Flow to 3B & D Core Spray Room Cooler.Caused by Biofouling,Silt Accumulation & Corrosion

ML19345B743
Person / Time
Site:	Browns Ferry
Issue date:	12/01/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B739	List: 05000296/LER-1980-047, Forwards LER 80-047/03L-0 05000296/LER-1980-047-03, /03L-0:on 801108,during Normal Operation, Difficulties Encountered While Trying to Determine EECW Flow to 3B & D Core Spray Room Cooler.Caused by Biofouling,Silt Accumulation & Corrosion
References
LER-80-047-03L-01, LER-80-47-3L-1, NUDOCS 8012020447
Download: ML19345B743 (2)

LER-1980-047, /03L-0:on 801108,during Normal Operation, Difficulties Encountered While Trying to Determine EECW Flow to 3B & D Core Spray Room Cooler.Caused by Biofouling,Silt Accumulation & Corrosion

Event date:
Report date:
2961980047R03 - NRC Website

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EVENT oATE 14 7S RIPoRT DATE 15 0 EVENT DESCRIPTION AND PROSA8LE CCNSEQUENCES O'o l During normal operations, difficulties were encountered while trying to determine o 2 g EECW flow to 3B & D' core spray room cooler.

These problems required removing o 3 See g g cooler from service for cleaning the cooling coils and flow sensing lines.

I g T. S. 3.5.D.1 and 3.5.A.2.

There was no public health hazard. Previous n 3 o e l occurrences: 50-296-8006, 8015, 8031. Radundant loop was in service.

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Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear. Plant.

BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 296 / 8047 Technical Specification Involved 3.5.D.1 & 3.5. A.2 Reported Under Technical Specification 6.7.2.b (2)

Date of. Occurrence 11/8/80 Time of Occurrence 1845 Unit -

'3 Identification and Description of Occurrence:-

4 Difficulties were encountered while trying to determine EECW flow to. 3B and D while performing, periodic' flow under MRI-303. Flow was 74 gpm; required flow is 75 gpm. Core spray room cooler necessitated removing the room cooler from service for cleaning the cooling coil and'the flow sensing lines.

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Conditions' Prior to Occurrence:

thit 1 - 1073 MWe.

i Unit 2 - refueling outage.

Unit 3 - 972 MWe-coastdown for EOC-3.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Redundant loop was operable.

Apparent' Cause of Occurrence:

Biofouling, silt accumulation, and corrosion caused room cooler and flow -

sensing lines to become restricted.

Analysis of Occurrence:

There was no damage'to plant equipment. There was no activity release, no personnel exposure or' injury and no danger to the heaith or safety of the public.

Corrective Action

The rcom cooler and, flow sensing lines were cleaned and flushed and the cooler was returnsd to service with satisfactory flow of-80 gpm.

Under ECN 1970, all carbon steel velves in EECW piping.4"' and smaller are being replaced with stainless steel valves. A study is in progress.co. determine the best method-of dealing with EECW flow problems., A DCR has been issued for Di DES to evaluate witching safety related EECW loads to a closed' cooling water system. Also, preparations are in progress to begin chlorination of the EECW/RHRSW system.

Failure Data:

LER BFR0 50-296/80006/80015/8031

• Retention:

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= Lifetime; Responsibility - Administrative. Supervisor

-$ Revision:

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