ML19309F243

Part 21 Rept Re Insp of Generator Control Panels for Emergency Diesel Generators.Results Determined Defects Could Degrade Emergency Diesel Unit to Unsafe Performance. Corrective Action Includes in-depth Insps & Training

ML19309F243
Person / Time
Site:	Hartsville, Phipps Bend
Issue date:	04/07/1980
From:	Falter H EMVMORKP, EMVPWRS
To:
References
REF-PT21-80-211-000 NUDOCS 8004290066
Download: ML19309F243 (4)

Text

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DATE OF ETIER 4/7/ f o DOCKET 10. HWLLt / #/Nf'N ~ IRTE DISTRIBIIIED - V// 7/ Fo ORIGINAL REPORT I SUPPEENT __ DISTRIBUTION: REACTOR (R) FUELCYCLE&] SAFEGUARDS (S MTERIALS(M) NRR/DDR, DIRECTOR AD/FFMSI~ AD/SG-IE , NRR/DR4 DIRECTOR INSS/FCMS AD/RDI AD/RDI ( 2 ) REGIGG REGIONS AD/RCI IE FIES NRR/DDR,DIECTOR EGIONS PDR NMSS/SG SS-881 IE FIES (2) LPDR PDR CENiPAL FIES CBiTPAL FILES-SS-396 LPDR CBfTPAL FILES (CHFUD CBTTFAL FIES(CHRDN) lEPA (016) PDR IE FIES (2) LPDR , CBffPAL FIES 016 TERA / LOEBhPA MB 5715 CENTPAL FILES (CHRJ:; CBffPAL FIES - SS-E LDEBMPA tiG 5715 ACTION: L0EBhPA MB 5715 PRELIMINARY EVLM! ATION OF THE ATTACHED REPORT It01 CATES LEAD RESPONSIBILITY FC: FOLLOW-UP AS SHOWN BELOW: EZ nE

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April 7,1980 [C b JL / l-O O O Nuclear Regulatory Comission Region II Office' 101 Marietta St. N.W. ~ Suite 3100 . - +-.- Atlanta, Georgia 30333

Reference:

Reportable Deficiency,10CFR21 Gentlemen: In response to General Electric's letter, subject, AG895/6005, TVA X17-X20, Control Panel Discrepancies, we wish to take this opportunity to notify you of our findings and actions in accordance with 20CFR21. Pcwer Systems Division of Morrison-Knudsen Company, Inc. has con-ducted an in-depth inspection of the generator control panels for the emergency diesel generators located at the Phipps Bend and Hartsville Nuclear Plants. The generaic control panels were manufactured by the International Contrei and Switchgear Company of P.O. Box 4847, Rocky Mount, North Carolina 27801. The results of the inspection have been reviewed by Power Systems Division to detemine if the defects found are reportable as required by 10CFR21. j It has been determined that the control panel defects found could degrade the emergency diesel generator unit to the extent that it ' may not perfonn its intended safety function. ~ Since defects were found at the two sites mentioned above, similar defects may also exist in generator panels manufactured by the International Control and Swtichgear Company which were furnished to other domestic nuclear facilities as follows:

                                                               *1.           Grand Gulf I & II (NRC Docket No. 50-4:5/50-417)
                                                               *2.           St. Lucie II (NRC Docket Nc. 50-389)
                                                               *3.           Skagit (NRC Docket No. 50-522/50-523)
                                                               *4.           Black Fox (NRC Docket No. 50-556) 1
                                                         *These facilities are not in operation at this time.                                                                                     .

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Corrective action has been essentially completed at'the Phipps Bend i and Hartsville Nuclear Plants. The corrective action consisted of:

1. In-depth inspection by Power Systems Division.

2. Repairs by TVA personnel. under the supervision of Power Systems Division, and General Electric Company Hartsville Nuclear Plant Quality Control Engineer.

The identified defects are as.follows:-

1. A small percentage of wire lugs were not crimped correctly.

The potential result could be a poor electrical connection which may result in the loss of an essential circuit.

2. There were instances in which 600 volt lugs were used on 4160 volt and 6900 volt cables. This could contribute to a degradation after a long period of time due to possible corona damage.

3. AC rated fuses were found in DC circuits. An AC fuse may not adequately clear a DC fault due to the shorter gap in the AC fuse.

4. Some of the bolts used in the electrical connections of the magnetics showed evidence of cerrosion. These bolts should be replaced with silicon bronze bolts.

5. Three wire lugs per panel were modified by drilling the bolt hole to a larger size to fit onto a stud. The enlargement

of the bolt hold degraded the strength of the lug.

Corrective action shall be implemented by Power Systems Division to I prevent recurrence of these defects. The corrective action includes: l l 1. In-depth inspection utilizing Power Systens Division Quality ( Control personnel during manufacturing process at International Control and Switchgear facility. P

2. Have revised our engineering control panel specifications to prevent recurrence of defects.

3. Implementation of training program to cover revisions in engineering control panel spectifications.

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The action required for the other installations I's' to schedule and perfonn ! an inspection of the generator control panels to detennine Tf those panels have similar defects. Should defects be. found, necessary corrective action

                    ' will be initiated.

Very truiy yours, POWER SYSTEMS . ..... 2 A MORRISON-KNUDSEN DIVISION J &_- Harry W. Falter Division Engineer l HWF:sjw l l Attachrnent 1 l l l l I 1 . l l l l l l 9 *i .*q',

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GENERAL ELECTRIC COMPANY,175 CURTNER AVE., SAN JOSE, CAUFORNIA D3125 ZDIYl*1 O N

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February 11, 1980 . .2.. . Morrison & Knudsen Power Systems Division Post Office Box 1928 Rocky Mount, No. Carolina 27801 ATTENTION: G.'C. HUGHES fo&b 5

SUBJECT:

AG895liM4, TVA X17-X20 PANEL DISCREPANCIES

REFERENCES:

TVA X17, FDDR fLGl-504, REY. O SHEETS 1-7 TVA X18, FDDR fLG2-502, REV. O SHEETS 1-6 TVA X19, FDDR fLG3,501, REV. O SHEETS 1-6 TVA X20 FDDR fLG4-502, REV. O SHEETS 1-6

The B/M for 7YA X17 is the same for X18, X19, & X20 (sheets 4,5,&6).

As the cor:raents are lengthy, your response is not requested until 2/22/80. Your response must be accurate to allow updati.,g of the panels a t the si tes . These discrepancies have been reported to the NRC by TVA and a complete report and action plan har been requested by the NRC. Again, I urge your prompt reply as indicated and urge that you contact the undersigned should you have any question. Very truly yours, GENERAL ELECTRIC COMPANY l [WeY' R. F. Pariani, Byyer l Electrical & Control Procurement Group II - Mail . Code 719

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