ML20073A064

Second Interim Deficiency Rept Re Failure of Westinghouse Low Voltage Switchgear.Initially Reported on 820823.DC Fuse Blocks Will Be Painted to Indicate Correct Position.Next Rept Will Be Submitted by 830804

ML20073A064
Person / Time
Site:	Bellefonte
Issue date:	04/04/1983
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NCR-1948, NUDOCS 8304110644
Download: ML20073A064 (2)

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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II S[{

5h April 4, 1983 W

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?'O BLRD-50-438/82-60 c $s 3

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c::s t-0 U.S. Nuclear Regulatory Commission mZ i;;

Region II w

Attn: Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

BELLEFONTE NUCLEAR PLANT UNIT 1 - WESTINGHOUSE LOW VOLTAGd SWITCHGEAR -

BLRD-50-438/82 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector Don Quick on August 23, 1982 in accordance with 10 CFR 50.55(e) as NCR 1948. This was followed by our first interim report dated September 21, 1982. Enclosed is our second interim report. We expect to submit our next report by August 4, 1983 If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.

Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills,LManager Nuclear Licensing Enclosure cc:

Mr. Richard C. DeYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Records Center (Enclosure)

Institute of Nuclear Power Operations

.1100 circle 75 Parkway,~ Suite 1500 Atlanta, Georgia 30339 f ~ 4C!AI COPV.

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i'304110644 830404

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PDR ADOCK 05000438 O

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An Equal Opportunity Employer

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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 WESTINGHOUSE LOW VOLTAGE SWITCHGEAR NCR 1948 BLRD-50-438/82-60 10 CFR 50.55(e)

SECOND INTERIM REPORT i

Description of Deficiency i

I The affected low-voltage switchgear was supplied by Westinghouse, i

During a test of the HVAC chilled water pump, Pittsburgh, Pennsylvania.

the 1EX2-A switchgear failed to trip when power was lost inadvertently.

Upon restoration of power, the pump motor was activated without benefit of component cooling water or lubricant because the low-voltage switchgear associated with these systems did trip thereby preventing unintentional reenergization. Consequently, the HVAC chilled water pump was burned out.

A preliminary investigation revealed that the probable cause of the deficiency was the insertion of a DC fuse block incorrectly in the The incorrect configuration resulted in an low-voltage switchgear.

open circuit which, in turn, prevented the switchgear from tripping.

I Interim Progress TVA has determined that the DC fuse blocks will be marked with paint This will to indicate the correct position for each fuse block.

significantly reduce the possibility of operator error when the fuse i

blocks are re-inserted.

l-TVA is evaluating this deficiency to determine the root cause of the TVA will nonconformance and the actions required to prevent recurrence.

l provide a final report upon completion of this evaluation.

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