ML20212H275

Forwards Rept Recently Received by Commission Under Reporting Requirements of 10CFR21,for Info

ML20212H275
Person / Time
Site:	River Bend
Issue date:	03/03/1987
From:	Gagliardo J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	Deddens J GULF STATES UTILITIES CO.
References
NUDOCS 8703060060
Download: ML20212H275 (1)

Text

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$07 In Reply Refer To:-

. Docket: 50-458-Gulf States Utilities

~ ATTN: Mr. James C. Deddens Senior Vice President, (RBNG).

Nuclear Licensing-P. O. Box 220 St. Francisville, Louisiana 70775 Gentlemen:

This forwards for your information a report recently received by the Commission under the reporting requirements of 10 CFR Part 21.

Although no response is' required to this -letter, we shall be pleased to answer any questions which you may have regarding this matter.

Sincerely, Odginal Signcy y, J.E.Gacliargo

-J. E. Gagliardo, Chief Reactor Projects Branch

Attachment:

_ Illinois Power Company letter dated January 25, 1986 cc/w attachment:

Gulf States Utilities ATTN:

J. E. Booker, Manager-i River Bend Oversight P. O. Box 2951 Beaumont, Texas 77704 Louisiana State University, Government Documents Department Louisiana Radiation Control Program Director bec to DMB (IE01)

-bec distrib. by RIV:

RPB DRSP R&SPB Resident Inspector R. D. Martin, RA R. Hall Section Chief (RPB/A)

D. Weiss, RM/ALF RIV File MIS S tem RSB 4[I RST p trator Project Inspector J

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CLINTON POWER STATION. P.O. BOX 678, CLINTON. ILLINOIS 61727 January 25, 1986 Docket No. 50-461 Mr. James G. Keppler Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

10CFR21-Defect PRC 84-42 Topaz Inverter Low Voltage Shutoff

Dear Mr. Keppler:

On October 19, 1984, General Electric (GE) Company notified Illinois Power of a potential reportable P_ art 21 defect.

Based on an evaluation, Illinois Power Company is providing the-following information to the Commission in accordance with the requirements of 10CFR Part 21.21(b)(3).

(i)

D.

P.. Hall, Vice President of Illinois Power Company, by means of this report, hereby informs the Commission of a 10CFR Part 21 defect.

(ii)

The basic component involved is one Class 1E GE dedicated inverter-(GE drawing 184C4723) used in the C61-P001 (Remote Shutdown System) panel.

(iii)

The components were supplied by:

General Electric Company Nuclear Energy Business Operations 175 Curtner Avenue San Jose, California 95125 l

(iv)

The defect is the adjustment of the low voltage shut off and turn on for GE dedicated Class 1E I

inverters (GE Drawing 184C4723).

This adjustment was set too high by the original manufacturer (Power Mark, a Division of Topaz).

Due to i

engineering error, the GE dedication process was checking for operable range of 105 to 140 volts DC, instead of 100 to 140 volts.

Topaz has been routinely setting the low voltage shut off at 105 volts DC.

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Typical DC bus' voltages are;GE.specified to. range pi

, Ds from 108 to-132' volts with momentary voltage dips.

.to1105 volts DC during;thefstartup of large DC loads.

This results-in.a condition where the-inverter may:not. start or. restart until the ~

voltage is _increas~ed, not just to 105 but to above -

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118 volts DC (13 volt fixed offset)..Since'the allowable momentary diptof the input bus voltage is equal ~to the factory preset inverter low voltage cutoff (105.VVC), this dip.could~resultiin:

an inverterLtrip~and a failure to restart during a-design basis accident.

The primary effect'ofiloss of'this power' supply is that-it-causes loss of the Reactor Core Isolation Cooling (RCIC) system.as-controlled'from the~ Remote Shutdown System.

Both

!R these systems are required for safe shutdown of" l

the plant.-

~(v)

-Illinois Power Company received notification'from

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General Electric Company.of a potential:Part.21 defect on this subject on.0ctober 18, 1984.

(vi)

- One-inverter was confirmed'to be~on the Clinton 2

siteTwithin the C61-P001-(RemotelShutdown System)-

panel.

Two additional. inverters were on order under Purchase Order X17174.

No spare inverters for~this application were on site.

o (vii)

Corrective Action by1GE consisted of the

-following:

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-a.

Issuing Revision-3 of drawing:184C4723 to reflect the correct trip voltages.

L b.

FDI-SKSZ and FDDR LH1-2998 were issued to-provide the procedure for resetting the on-site inverter to.the. proper low voltage l

set point.

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- GE Work Request i 396 was completed September c.

L 9, 1985, which verified that the inverter was operating properly.

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(viii)

Not applicable to Illinois Power.

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1A.120 for.your review'at our offices.Our evaluation of this reportable de I trust that.this letter provides sufficient information for your review and analysis

'of the~ problem.

Sincerely yours,

. Hall Vice President KAB/kaf'

' USNRC Resident Office cc:

Illinois Department of Nuclear Safety Director of Inspection and Enforcement INPO Records Center (3 copies) e 9

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