ML20134H141

Confirms That Branch Assumes long-term Followup on Insulation Damage at Facility Involving Electrical Containment Penetration Circuits in 870630 Morning Rept Encl

ML20134H141
Person / Time
Site:	San Onofre
Issue date:	12/29/1987
From:	Lanning W Office of Nuclear Reactor Regulation
To:	Stone J Office of Nuclear Reactor Regulation
Shared Package
ML20127A865	List: ML20127A863 ML20134H015 ML20134H052 ML20134H101 ML20134H141
References
FOIA-96-354 NUDOCS 9611130544
Download: ML20134H141 (5)

Text

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. ;jg UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON D. C. 20555

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OfC 2 9 !$7 HEVORANDUM FOR: J. Stone, Acting Chief Vendor Inspection Branch Office of Nuclear Reactor Regulation  ;

i FROM: Wayne D. Lanning, Chief Events Assessment Branch Office of Nuclear Reactor Regulation

SUBJECT:

TRANSFER OF OPERATING EVENT LONG-TERM FOLLOWUP The purpose of this memorandum is to confirm that your branch will assume the long-tenn followup on insulation damage at San Onofre 1 involving electrical containment penetration circuits reported in the 6/30/87 morning report (Enclosure 1). This problem involves a loss of electrical circuits through containment boundary due to damaged insulation in electrical penetration assembly pigtails. This task has already been initiated by your branch.

The generic applicability of the problem will be further investigated and an information notice will be written.

A Technical Assign: rant Control (TAC) has been issued for this foll vup (Enclosure 2). Please provide the Events Assessment Branch (EAB) with a projected completion date for your evaluation.

We will monitor this activity until you infonn us that all followup actions have been completed. We will extract data from the TAC /RITS data base to provide aoffices.

regional weekly status of long-term follow;1 activities to headquarters and Therefore, please estabsh a se duled completion date and keep the TAC data current.

r yf( '. nning, Chief Events Assessment Bran h Office of Nuclear Reacto egulation cc: M U. Potapovs H. Rood G. Knighton G. Holahan D. Crutchfield M.L. Reardon J. Partlow

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PRIORITY ATTENTION REQUIRED' MORNING REPORT - REGION V JUNE 30,1987 4

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LICENSEE / FACILITY NOTIFICATION / SUBJECT '

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SONGS # 1 UPDATE OF R.l. TO RV ON 6/16/87/

DN 50-206

' CONTAINMENT PENETRATION GROUNDING REN N/A EVENT

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j ON JUNE 15.1987 SOUTHERN CALIFORNIA EDISON (SCE) ADVISED REGION V i OF A PROBLEM INVOLVING DAMAGE TO INSULATION ON CONTAINMENT PENETRATION '

ELECTRICAL CIRCUlTS AT SAN ONOFRE UNIT 1 (SONGS 1). THE LICENSEE'S

. FOLLOWUP ACTION INCLUDED A 100% INSPECTION OF EXPOSED "K APTON*

INSULATED CABLES. IN ADDITIDN. ALL CRDM CABLES WERE CHECKED FOR LOW -

INSULATION RESISTANCE BY USING A MEGGER. OF THE 2362 CABLES THAT WERE VISUALLY INSPECTED OUTSIDE OF THE CONTAINMENT,37 REQUIRED REPAIR. INSIDE OF THE CONTAINMENT 2506 CABLES WERE VISUALLY INSPECTED.

15 REQUIR,ED REPAIR. 35 CRDM CABLES WITH LOW INSULATION RESISTANCE

. READINGS WERE REPLACED.

AFTER COMPLETING THE REPAIRS THE LICENSEE ENTERED MODE 3 ON SATURDAY, JUNE 27,1987, WITH PLANS TO ENTER MODE 2 TODAY AND CONTINUE STARTUP FROM THEIR MID-CYCLE OUTAGE.- THE LICENSEE IS STILL CONCERNED ABOUT THE SUSCEPTIBILITY OF THE CABLES TO FUTURE DAMAGE AND IS EVALUATING LONG-TERM ACTIONS TO PROVIDE ADDITIONAL PROTECTION.

CONTACT; P. QUALLS (FTS) 463-3759 l

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NUMEROUS DAMAGED PlGTAll LEADS IN CONTAINMENT ELECTRICAL PENETRATION ASSEMBLIES (EPA'S)

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NICKED KAPTON INSULAT!0N l SALT AIR CONDENSATION l

SIGNIFICANCE i  !

LDSS OF ELECTRICAL CIRCUITS THROUGH CONTAINMENT BOUNDARY l DISCUSSION JUNE 15, 1987, P.LANT IN EXTENDED MAINTENANCE OUTAGE, DAMAGED I INSULATION FOUND IN NEW EPA PIGTAILS. i

! PIGTAILS HAVE 0.00,9 INCH KAPTON INSULATION, POLY 0LEFIN SLEEVES OVER PIGTAILS PUST BE CUT TO ALLOW FIl SPLICING TO PLANT CABLES.  !

EQUIPMENT REPLACEMENT AGGRAVATES PROBLEM. P i

>" PIGTAILS 8 EQUIPMENTOUTSIDE AIR LOCK WAS CONTAINMENT OPEN FOR SIX WEEKS, ARE EXPOSED TO SALT AIR SALTWATER REACTS WITH COPPER CONDUCTOR TO CORRODE COPPE PRODUCE SODIUM HYDROXIDE, WHICH READILY DISSOLVES KAPTON.

4 SHORT TERM FIX WAS VISUAL INSPECTION AND REPAIR, -

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• VISUAL INSPECTION RESULTS:

OUTSIDE CONTAINMENT 37 0F 2361 CABLES DEFECTIVE -

INSIDE CONTAINMENT 15 0F 2506 CABLES DEFECTIVE j

35 CRDM CABLES ALSO REPLACED BASED ON INSULATION PESIS TOTAL OF ABOUT 150 TO 200 LEADS INVOLVED. -

GENERIC CONCERNS:_

- NUMEROUS PLANTS USE CONAX EPA'S & SEALS.

- IN 87-08 ADDRESSES NICKED KAPTON INSULATION ON LIMITOROU '

FOLLOWUP 1

LONG TERM ACTION BEING DEVELOPED BY SCE, i *

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