05000336/LER-1982-024

LER 82-024/03L-0:on 820606,120-volt Ac (VIAC-1) Lost Causing Power Fuses to Blow in Facility I ESAS Cabinet.Caused by Roof Leak Resulting from Heavy Rains Allowing Water to Enter Top of Inverter & Shorting Circuitry.Water Shield Installed

ML20055A938
Person / Time
Site:	Millstone
Issue date:	07/06/1982
From:	Deslandes K NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20055A933	List: 05000336/LER-1982-024, Forwards LER 82-024/03L-0
References
LER-82-024-03L, LER-82-24-3L, NUDOCS 8207200148
Download: ML20055A938 (1)

LER-2082-024,

Event date:
Report date:
3362082024R00 - NRC Website

text

NRC QR A8 E6 U S. NUCLE AR REGULATORY COYMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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EVENT DESCRIPTloN AND PROB ABLE CONSEQUENCES h lo 121 l During routine steady state operations,120 volt AC (VIAC-1) was lost. The loss of I

[ o 13 l l VIAC-1 caused the power fuses to blow in Facility I ESAS cabinet. The, plant operated l Io p1 l ni accordance with Technical Specifications 3.8.2.1 and 3.3.2.1. VIAC-1 was deener- 1 I o I s 1 I gized for approximately 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. The facility I ESAS cabinet was deenergized for l lo ic l l approximately 61/2 hours. Similar occurrences: None. The inverter is a Solid State l l o l 71 l Controls Inc. ; Model SV 12150/TS-150 NB. I I

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M 47 CAUSE oESCRIPTION AND CORRECTIVE ACTIONS l3ioi lA roof leak resulting from abnormally heavy rains allowed water to enter the top of l 3 i i the inverter, shorting the circuitry. The alternate 120 volt AC source was unavailablei j,i,ijat the time. The inverter was inspected and wetted components corrected. The Facility;

, 3 l I ESAS cabinet fuses were replaced when VIAC-1 was restored. A water shield has been l ii id i l installed for inverters 5 and 6. I STA $  % POWE R OTHER ST ATUS Dis O RY DISCOVERY DESCRIPTION NA Operator observation I t Is l LEJ@ l1 l0 l 0l@l l lAl@l l ACTIVITY CO TENT QELE ASED OF RELE ASE AMOUNT OF ACTivlTY LOC ATION OF RELE ASE NA l 1 6 [_Z_j @ LZj@l NA l l 45 80 7 8 9 to 11 44 PE RSONNE L E XPOSURES NUYBE R TYPE i 7 l 0 l 0 l 0 l@l 2 l@ l DESCRIPTION NA l

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Pue ocity 8207200148 820706 N AC USE ON LY

• issaE D D E SC RiPTION PDR ADOCK 05000336 .

8 LN_J@l S PDR I IIlIIIIIIIIIII 7 8 9 10 66 69 80 5 NAYE OF PREPAAER Keith D. Deslandes psoys 447-1791 (4421) E,