ML20106E609
| ML20106E609 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/15/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 84-07, 84-7, ZNRC-4-169, NUDOCS 8410300031 | |
| Download: ML20106E609 (4) | |
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'Af (41277-4 Nuclear Construction Division Telecopy 8
Robinson Plaza Building 2, Suite 210 Pittsburgh, PA 15205 October 15, 1984 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Power Conversion Products, Inc.
Potential Significant Deficiency Report 84-07 Gentlemen:
This interim ~ report is in reference to the Potentially Reportable Significant Deficiency relating to the voltage regulators supplied by Power Conversion Products, Inc.
Pursuant to the requirements of 10 CFR50.55 (e),
it is anticipated that a subsequent report will be submitted to Region I by December 14, 1984.
DUQUESNE LIGHT COMPANY
/
By u
E.(/J."Wooleve r Vice President SDH/wjs Attachment cc:
Mr. R. DeYoung, Director (3) (w/a)
Ms. M. Ley, Project Manager (w/a)
Mr. E. A. Licitra, Project Manager (w/a)
Mr. G. Walton, NRC Resident Inspector (w/a)
INPO Records Center (w/a)
NRC Document Control Desk (w/a)
SUBSCRIBED AND SW B FORE ME THIS
/ M DAY OF L
1984.
0 J ATL 84103ON31 841015 Notary Public PDR ADUCK 05000412 S
PDR ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
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Unitzd Stttas Nuclogr R3gulitory Conuniosion Dr. Thom3a E. Murley Page 2
~ COMMONWEALTH OF PENNSYLVANIA )
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SS:
COUNTY OF. ALLEGHENY
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On this
/ M day'of
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, before me, a Notary Public in and for said Commonwealth and County, personally appeared E. J. Wooleve r, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and - correct to the best of his knowledge.
L Notary Public ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP. ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
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BEAVER VALLEY POWER STATION - UNIT NO. 2 DUQUESNE LIGHT COMPANY Potential Significant Deficiency Report 84-07 Voltage Regulators Supplied by Power Conversion Products, Inc.
1.
SUMMARY
A limited inspection of the voltage regulators supplied by Power Conver-sion Products, Inc., (PCP) under Purchase Order 2BV-337 was performed by Beaver Valley Power Station Unit 2's (BVPS-2) Site Quality Control Group (SQC).
This inspect ion res ult ed in identifying potentially significant deficiencies in internal wiring workmanship. An evaluation is continuing to determine the specific safety significance of this issue. On September 14,1984, BVPS-2 submitted the initial to Region I, NRC Office.
2.
IMMEDIATE ACTION TAKEN on August 10, 1984, Mr. Hall, Acting Manager of Duquesne Light Company's Regulatory Af fairs Department, nctified Mr. G. Meyer of the NRC Region I Of fice of this potentially significant de t ic iency.
The subject PCP equipment was incorporated into a 100% inspection / repair program for Class 1E electrical equipment. Refer to Section 5, " Corrective Action to Remedy Deficiency."
3.
DESCRIPTION OF THE DEFICIENCY Specific instances ' of poor wiring workmanship that were noted by SQC included:
- problems with crimping practices
- broken conductor strands
- unauthorized use of solder
- ' nicked and gouged insulation on conductors
- incorrect type of connectors
- excessive tension on conductors
- improper use of splice connectors 4.
ANALYSIS OF SAFETY IMPLICATION Of the observed deficient conditions, instances of poorly crimped conduc-tors were the nost numerous.
If one of the improperly crimped wires were to detach from its lug under vibratory seismic loadings, a los s of func-tion for the voltage regulators. could result.
Conductors with broken strands or damaged insulation could likewise cause a loss of regulato r function under seismic loadings.
Thus, the above de ficient conditions have the potential to cause the loss of Class IE voltage regulators during a seismic event and/or prolonged exposure to the natural frequen-cies experienced during normal operation of the equipment.
In addi t ion to regulating the voltage to the required loads, the PCP equipment func-tions as Class IE isolation devices.
The loss of either this isolation funct ion or the ability to deliver powe r to downstream Class IE loads, due to deficient wiring workmanship, coupled with a single failure of a redundant vital bus or. isolating transformer, could adversely impact the capability of the plant to safely shutdown under certain accide nt conditions.
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-e Currently, evaluations are being performed for the subject equipment to determine if any of the noted vendor wiring deficiencies could result in the loss of the equipment's isolation functions or ability to deliver power to Class IE loads.
The results of these evaluations will be used in the safety analysis for this po tent ial deficiency.
Evaluat ions are scheduled to be completed by December 14, 1984, at which time an addi-tional report will be submitted.
5.
CORRECTIVE ACTION TO REMEDY DEFICIENCY The inspection / repair program regarding workmanship of internal wiring of vendor supplied Clars IE electrical equipment for BVPS-2 is presently in process.
Specific wiring workmanship criteria have been incorporated into Specification 2BVS-931, which is the controlling document for elec-trical equipment installation at-BVPS-2.
The subject equipment is included in the general vendor-supplied Class IE electrical eq uipment workmanship inspection / repair program and evaluation of the noted problems will be performed using the workmanship program documents.
Noted deficiencies will ~ be corrected following defined approved proce-dures (2BVS-931 and vendors standards).
The completion date fo r the workmanship inspection / repair program is scheduled for June 30, 1985.
6.
ADDITIONAL REPORTS In addition to this interim report, another report regarding the po t en-tially significant deficiency with Power Conversion Products vo lt age regulators will be issued by-December 14, 1984.
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