ML20028D266

LER 82-165/03L-0:on 821213,Divs I & II Diesels Declared Inoperable Due to Discovery of Unqualified Cable in Diesel Generator Control Circuitry.Caused by Vendor Notification That Cables Failed IEEE Flame Test.Controls Deemed Adequate

ML20028D266
Person / Time
Site:	Grand Gulf
Issue date:	01/11/1983
From:	Walker K MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028D258	List: ML20028D257 ML20028D266
References
LER-82-165-03L, LER-82-165-3L, NUDOCS 8301170274
Download: ML20028D266 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 7 H o o .- LICENSEE EVENT REPORT Attachment to AECM-83/018 e - Pa e 1 of 2 CONVROL BLOCX: l 1

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lh (PLE ASE PRINT OR TYPE ALL R QUIRED INFORMATION)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo l2l lOn December 13, 1982, the Division I and II diesels were administravelv declared I t o l a i linOperable due to discovery of unqualified cable in the DG control circuitry. Only J l O l 4 l lone ECCS remained operable (HPCS), therefore, LCO's were entered in accordance with l g lT.S.3.8.1.2 and 3.5.2. The event has been reported under the requirements of 10CFR21 l gl and 10CFR 50.35e. The event had no effect on the health and safety of the public l l0l7l land did not constitute a threat to plant safety. l I

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9 10 12 13 18 19 20 7 8 11 SEQUENTIAL OCCURRENCE REPORT REVISION E REPORT NO. CODE TYPE N O.

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41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11 l o l lThe event was declared af ter notification by the vendor that the cables failed to meet l lil1l lthe IEEE flame test. An engineering evaluation determined that sufficient redundnncv I j1 l7l land rdministrative controls existed to declare the diesels operable. They were l

lil3l l rett rned to service on December 14, 1982. This is a final report, l l

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80 7 8 9 ST S  % POWER OTHE R STATUS DISCOV RY DISCOVERY DESCRIPTION i 5 W@ l 0l 0l Ol@l NA l l_D_j@l Vendor Notification l ACTIVITY CO TENT RELE ASED OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE lil6l[,Z_j@ @l NA 44 l l 45 NA 80 l

1 8 9 10 11 PERSONNEL EXPOSURES NUMBE R TYPE DESCRIPTION i 7 l0l0l0l@lZlhl NA 80 l

PE RSONNE L INJURIES NUYPE R DE SCRIP TION l 7 1 a 8 9 l0l0l0l@l 11 12 NA 80 l

LOSS OF OR DAM AGE TO F ACILITY TYPE DE SC4tPT ION

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[ 7 8 9 10 PUBL ICI T Y Q 8301170274 830111 NRC USE ONLY _

PDR ADOCK 05000416 2 o issue LN_j ln@ DESCRIPTION S \'f/ PDR l lllllllllllll3 80 68 69 NAME OF PREPARER Orieinal sinned by Ken Walker PHONE' i ._

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, Attachment to AECM-83/018 Page 2 of 2 SUPPLEMENTARY INFORMATION TO LER 82-165/03 L-0 Mississippi Power & Light Company Grand Gulf Nuclear Station - Unit 1 Docket No. 50-416 Technical Specification Involved: 3.8.1.2 and 3.5.2 Reported Under Technical Specification: 6.9.1.13.b Event Narrative:

On December 13, 1982, the Division I and II diesel generators and their associated ECCS Systens were administrative 1y declared inoperable after notification by the diesel vendor that certain tachometer cables in the control circuitry were unqualified. The cables failed to meet a required IEEE flame test. LCO's were entered as only one ECCS remained operable (HPCS).

This was also reported as a Potentially Reportable Deficiency on December 14, 1982 with " indeterminate" status. An immediate engineering evaluation was conducted with respect to system operability. It was determined that the diesels need not remain inoperable as two redundant control circuits separated by fire barriers provided a high degree of reliability that diesel starts would occur as required. In addition, administrative controls and equipment monitoring following auto start would allow rapid identification of any threat to the equipment from fire. Further, fire detection equipment in DC rooms would notify operations personnel of any problem and the DG would be declared inoperable until a sufficient investigation could be conducted. Therefore, the diesels were declared operable again on December 14, 1982. This is considered a final report with respect to entering the LCO's. The event has been reported under the requirements of 10CFR21 and 10CFR 50.55e in our letter of January 13, 1983, (AECM-83/020) to J. P. O'Reilly. A complete evaluation of the situation, including plans to replace the cables in question, is included.