Difference between revisions of "ML20023C252"

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LER 83-026/03L-0:on 830411,while Establishing EECW Flow Rate to Emergency Diesel 3 Generator Cooler Following Mod,Head on HX Found Cracked,Rendering Generator Inoperable.Caused by Mfg Defect.Crack in Cast Iron Head Repaired
ML20023C252
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 05/09/1983
From: Holder E
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20023C251 List:
References
Download: ML20023C252 (2)


Text

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             ,          .                         ..               .,                                                       ..               ..                                        7.       .9        R E POR T O.T E        .9 EVENT CESCRIPTION AND PROBABLE CONSEQUENCES l 0 l2 l l Durinn normal operation on unit 3. while attempting to establish the EECW h

l l013Il flow rate to the 3 ED Emergency Diesel-Generator Coolers followine a l lo l4 ll modification, a head on the heat exchanger was found to be cracked. The l lol5ll generator was rendered inoperable and unit 3 placed in an LCO (T.S. 3.9.B.2). l

           !016ll Redundant systems were proven operable. There was no danger to the health                                                                                                                                                    l l0l7ll and SafetV of the Dublic.                                                                                                                                                                                                    l 10laIl
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L.nJO L.A 18 U@ 33 3 33 L.IJ O 3 I ol of o I ol._.I@ 37 .e YJ ==O L.,.I.18 L.3.LI O l Y! Ol2 l1 I CAUSE DESCRIPTION AND CORRECTtVE ACTIONS h (1l0 ll A Young Radiator Company heat exchanger head was found to have an apparent l ltl1 ll manufacturing defect which became apparent due to inservice stresses. The l I l2ll crack in the cast iron head was repaired, tested and the diesel generator was l l 1 l 3 I [_r, turned to service. A newly f abricated head will be installed at the l

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      - PDR ADOCK 05000296 g                                                PDR

1 - 3 . Tennessee Valley Authority Form BF'17 b

                      ' Browns Ferry Nucle m Plant                                                    BF 15.2 2/17/82 e

LER SUPPLEMENTAL INFORMATION .

BFRO 296 / 83026 Technical Specification Involved 3.9.B.2 Reported Under Technical Specification 6.7.2.b(2)
  • Date Due NRC 5/10/83 Event Narrative:

. Units 1, 2 and 3 were operating at 81-percent power, 83-percent power and 99-percent power respectively. Only unit 3 was affected by this event.

Af ter performing modification work on the 3 ED Emergency Diesel-Generator Cooler, one of the heat exchanger heads was found to be cracked, apparently due to a manufacturing defect, when the flow rate to,the EECW cooler was established. The genecator was dec'lared inoperable and unit 3 was placed in an LCO (Technical Specification 3.9.B.2). ,

The crack in the cast iron head was repaired, tested and the diesel-generator returned to service in four days. A newly fabricated head will be installed at the next opportunity. Metallurgical personnel feel this was a random occurrence and no further review is planned. Redundant and backup systems were proven operable. There was no danger to the health and safety of the public. s l , 1 ( . b< t,

  • Previous Similar Events:

None

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