ML20084U551
| ML20084U551 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/06/1973 |
| From: | Gilleland J TENNESSEE VALLEY AUTHORITY |
| To: | Kruesi F US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084U431 | List: |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8306290114 | |
| Download: ML20084U551 (2) | |
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Mr. F. E. Krucci, Director Directorate of Regulatory Operations U.S. Atomic EnerCy Cornission Vashington, D.C.
20545
Dear t.r. Kruesi:
On 'May 7,1973, TVA notified Directorate of Reculatory Operations Region II office by telephone of what was believed to be a repnrtable deficiency in a cable connector at the Browns Ferry I:uclear Plant.
In accordunce with paraEraph 50.55(e) of 10 CFR 50, we are submitting the encleced formal report of the deficiency.
Very truly yours,
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- 21. E. G111 eland Assictant to the Manager of Power Enclosure CC (Enclosure):
Mr. I!ornan C. Moseley, Director Directorate of Regulatory Crerations U.S. Atomic Enercr Cctaission Region II - Suite 818 230 Peuchtree Street, W.
Atlanta, Georcin 30303 8306290114 740617 PDR ADOCK 05000259 l
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BR0": S FEPRY N" CLEAR FLi? T C;1T 1 EEFORTABLE DEFICIE::CY - FIN \\L DEFICIE:;CY REECRT FALWE OE' CABLE C0:;'.;ECIOR E5 FOR DRT,lELL ELCWER 1A4 AT FENETRATIO: EA Dryvell blevar 1Ah was in cervice to support the Prica /
Contair:2nt Leak P. ate Test.
Cn M2y h, 1973, a crcund vns detected en hECV chutdevn board 1A.
It vac treced
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to the cotor control center (MC) feeder co' partment for dryvell blcver lAh. The cc=ce cf the g-cund was traced to the pcVer lead for the dryvell blower. Thece power leads are routed th cu--h electrical penetration EA, connection 25-5E.
Further checkirc; showed that a 10,0C0-oh:1 recistc. : e path existed frca 3 phace to the shell cf connector ES (cable half of the connector outcide the dryvell). The connector in cucation had been potted following nc=21 precedures. The connector was cut away fror the cables and vts tested after heatin;;. The After resistance path ves then =cacured to to 5,CCO ch=c.
cooling to c2bient temperature, the resistance increaced to 10,CCO ch:3.
The pottin;'; co=cu.i van removed fro = the connector, an1 the connector was retested. The recistance path had chant;ed from lO,CCO olra to 50 tegci'rs. Tnic was ceasured at 500V DC vith a pertable ce.ger.
It va: ccncluded that scre i= purity W.3 in the connector prior l
Lo pottinc.
1." tar the pcttin; ccrpcu ri was recoved and replaced, the anc:aly no 1cn;cr existed.
Since this dryvell bicuer is ; overed from an ungrounded cyctec, no less of functica vould occur from this cin ;1c grourd.
T'.cre are 10 drpeell bicvera installed, cicht of which cre required fer centinued rever creration, but servu no safety function during a desiga bacia cccident.
In order to accure that the other connectors for Unit 1 do not have sicilar defectc, TVA vill =oniter the grourri detector 3 du-ing the trecrerational and startup test
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