ML19309G090

Fourth Interim Deficiency Rept Re High Pressure Core Spray Diesel Generator Switchgear Wiring.Util Performed Wiring Check & Found Evidence of Poor Workmanship.Discrepancies Were Corrected.Final Rept Will Be Provided by 800630

ML19309G090
Person / Time
Site:	Phipps Bend
Issue date:	04/25/1980
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19309G088	List: ML19309G087 ML19309G090
References
NCR-PBN-033, NCR-PBN-33, NUDOCS 8005020340
Download: ML19309G090 (2)

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() 8006020340 ENCLOSURE PHIPPS BEND NUCLEAR PLANT HICH PRESSURE CORE SPRAY DIESEL GENERATOR SWITCHCEAR WIRING DISCRCPANCIES 10CFR50.55(e) REPORT NO. 4 (INTERIM)

NCR PDN-033 On August 2, 1979, TVA notified NRC-0IE Regien II Inspector, F. S.

Cantrell, of a reportable condition under 10CFR50.55(e) regarding wiring discrepancies discovered in high pressure core spray (HPCS) diesel generator (DG) control switchgear for both units of the Phipps Bend Nucicar Plant (PBN).

TVA previously reported similar problems in HPCS DG switchgear for -

the Hartsville Nuclear Plant (NCR HNP-A-021) and our final report to you on that deficiency was dated March 7,1979, from J. E.

Gilleland to James P. O'Reilly. This is the fourth interim report on the subject reportable deficiency for the Phipps Bend Nuclear Plant. TVA will submit a final report on this deficiency on or before June 30, 1980.

Description of Deficiency TVA site personnel at Phipps Bend Nucicar Plant performed a wiring check on the two sets of HPCS DG switchgear as a result of their followup on corrective actions taken. As a result of this wiring check, TVA found similar discrepancies as reported for the Hartsville Nuclear Plant HPCS DG switchgear and found the switchgear wiring contained evidence of poor workmanship such as wires pulled out of terminal lugs, inadequate terminations, loose and broken soldering joints, and cables with considerable wear or several strands of conductor cut. Work which was done to correct the discrepancies also uncovered several instances where the wiring was functionally correct but the wiring drawings did not match the as-built wiring -

con figuration.

The DC control switchgear was f abricated by International Controls and Switchgear (ICSS), Rocky Mt., North Carolina, for Morrison-Knudson Power Systens Division, Rocky Mt., North Carolina, under subcontract from CE who supplied these components to TVA as part of the NSSS package for the Hartsville and Phipps Bend Nuclear Plants.

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1 Corrective Actions Representatives from GE-San Jose, Morrison-Knudson, and IC&S met at-Phipps Bend Nuclear Plant beginning February 25, 1980, to thoroughly investigate and resolve the discrepancies and to do a 100-percent

" ring out" of all wiring on the two Phipps Bend units. Since then over 90 percent of the discrepancies noted in the nonconformance report (PBN-033, Revision 1) have been corrected. The 100-percent

" ring out" of wiring also uncovered a few more minor discrepancies which have been or will be corrected. The only other corrections (due to conditions listed on the NCR) remaining to be made involve replacing some rpm indicating lights on the engine control cubicles for both units due to loose, broken, or improper connections. The replacement parts were not availat?e at the site in late February, but are expected to be received in May 1980. Additionally, two drawings (which were found to be in error and revisions marked in the field) have not been received " officially" at Phipps Bend as revised. The uncertainty in the date when the revisions to these two drawings will be transmitted to TVA is the reason for this being an interim rather than final report.