ML19269E327

LER 79-011/03L-0 on 790521:three Cables Not Installed in Accordance W/Drawings.Caused by Error in Cable Routing During Initial Const.Reroute of Cables Will Take Place During Nov 1979 Refueling Outage

ML19269E327
Person / Time
Site:	Quad Cities
Issue date:	06/14/1979
From:	Willemsen B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19269E326	List: ML19269E325 ML19269E327
References
LER-79-011-03L-03, LER-79-11-3L-3, NUDOCS 7906270217
Download: ML19269E327 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION ~

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. LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l 6

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DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l A field Investigation of Unit Two Engineered Safeauard System (ESS) cable Dans found a 3 three cables that were not installed in accordance with cable tabulation drawings. l 0 4 l These cables are the main feed cables for MCC 28-2 from Bus 28, an ESS I Bus. The o s routing of these ESS I cables lie in ESS 11 cable pans that contain the main feed l 0 6 l cables for ESS II MCC 29-2. The loss of MCC 28-2 and MCC 29-2 would not affect a 1 0 7 l safe reactor shutdown or jeopardize the performance of ECCS. l lo 8 l l 7 8 9 03 SYSTEM CAUSE CAUSE COVP. VALVE CODE CODE SLBCODE COMPONENT CODE SUBCCOE SUSCODE 7

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o lThe cause of this event is an error in cable routino made durinn initial construction. l t i  ! The corrective acM on will be to re-route the ESS Division I, main feed cables to 1 i 2 l MCC 28-2 dur r.g Llie November 1979 refueling cutage in accordance with the cable l 3 3 l tabulation drawing. l 1 4 7 8 9 80 STA S  % POWER # OTHER STATUS ISCO RY OlSCOVERY DESCRIPTICN t 5 l El@ l 0 l 7 l8 lgl NA l lClgl Inspection l

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1. LER NUMBER: LER/R0 79-ll/03L

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit Two IV. DOCKET NUMBER: 050-265 V. EVENT DESCRIPTION:

A field Investigation of Unit Two Engineered Safeguard System (ESS) cable pans found three safety-related cables that were not installed in accordance with the cable tabulation drawings. These cable numbers cre 21359, 21360, and 21361 and are the main feed cables for MCC 28-2 from Bus 28 and ESS I Bus. The routing of these ESS I cables lie in ESS 11 cable pans that contain the main feed cables for ESS II HCC 29-2.

VI. PROBA6LE CONSEQUENCES OF THE OCCURRENCE:

The consequences of this occurrence are minimal in that the loss of both MCC 28-2 and MCC 29-2 would not affect a safe reactor shutdown. Also, the loss of MCC 28-2 and MCC 29-2 would not jeopardize the performance of the reactor emergency core cooling systems.

Vll. CAUSE:

The cause of this event is an error in cable routing made during initial construction.

Vill. CORRECTIVE ACTION:

Under work request number 2822-79, the ESS Division I, main feed cables to MCC 28-2, will be re-routed during the November 1979 refueling outage in accordance with the cable tabulation drawing.

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