05000461/LER-1998-004, Forwards LER 98-004-01 & 10CFR21 Rept 21-98-004/015, Division 2 Nuclear Systems Protection Sys Inverter Not IAW Plant'S Design Basis Due to Various Deficiencies. Commitments Made by Util,Listed

Forwards LER 98-004-01 & 10CFR21 Rept 21-98-004/015, Division 2 Nuclear Systems Protection Sys Inverter Not IAW Plant'S Design Basis Due to Various Deficiencies. Commitments Made by Util,Listed

ML20248E927
Person / Time
Site:	Clinton
Issue date:	05/28/1998
From:	Walter MacFarland ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20248E930	List: 05000461/LER-1998-004, Forwards LER 98-004-01 & 10CFR21 Rept 21-98-004/015, Division 2 Nuclear Systems Protection Sys Inverter Not IAW Plant'S Design Basis Due to Various Deficiencies. Commitments Made by Util,Listed
References
REF-PT21-98 U-602996, NUDOCS 9806040042
Download: ML20248E927 (2)

LER-2098-004, Forwards LER 98-004-01 & 10CFR21 Rept 21-98-004/015, Division 2 Nuclear Systems Protection Sys Inverter Not IAW Plant'S Design Basis Due to Various Deficiencies. Commitments Made by Util,Listed

Event date:
Report date:
4612098004R00 - NRC Website

text

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j ', ' , , ' , Illinois Power Company .

1 Clinton Power Station 3 P.O. Box 678 Chnton. IL 61727 Tel 217 935-5621 Fox 2ir 935 4632 I.,, Walter G. MacFarland IV l: . Senior Vice President .

and Chief Nucl6ar Officer i

POWER' L%",'

l An Imnova Company ,gy,g l May 28, 1998 u

Docket No. 50-461 10CFR50.73 l

10CFR21.21 i

! Document Control Desk

? Nuclear Regulatory Commission Washington, D.C. 20555 Subjectr Clinton Power Station - Unit 1 Licensee Event Report No. 98-004-01 and 10CFR. Part 21 Report No. 21-98-004/015 -

p L

Dear Madam or Sir:

Enclosed is Licensee Event Report (LER) No. 98-004-01 and 10CFR, Part 21

Report No. 21-98-004/015

Division 2 Nuclear Systems Protection System Inverter  ;

.Not in Accordance With the Plant's Desian Basis Due to Various Deficiencies. The l i ~ reports have been revised to include cause, corrective action, assessment of safety consequences and implications, and similar event information. This report is being

! submitted in accordance with the requirements of 10CFR50.73 and 10 CFR, Part 21. 1

. The enclosed reports contaliithe following commitments:

1 e : Vendor manual K2801-0144 will be revised to include the corrected calibration

method for the inverter lock-up detector and various vendor recommendations  ;

for the Divisions 1,2,3 and 4 NSPS inverters. Vendor manual K2801-0223 will ,

be revised to include the vendor calibration recommendations for the A and B -

NSPS Solenoid (RPS) UPS inverters.

e. Training will be provided to appropriate Maintenance personnel on the following ' .

procedures and techniques: proper twisting of SCR leads; proper application of

,. heat transfer compound; proper installation of power semi-conductors (SCRs  !

and diodes); proper installation of compression clamp assemblies for battery

" chargers and inverters.

• ' IP will evaluate the need to provide ad'vanced soldering training to Electrical Maintenance personnel. t

{ .

9906040042 980528 E < U l

,J Pun ADOCK 050004610 1 8 .

POR M.-

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, ,n .

U-6029%

Page 2 _

'* The Divisions 1,3, and 4 NSPS inverters, and the A and B NSPS Solenoid (RPS)

UPS inverters will be inspected in accordance with MWRs D77402, D77403, D77404, D77405, and D77406 for deficiencies similar to those found on the ,

, Division 2 NSPS inverter. The MWRs will contain sufficient detail injobsteps to -l' enable Maintenance technicians to identify and properly correct deficiencies similar to those found on the Division 2 NSPS inverter.

• A preventive maintenance program will be developed for the inverters based on the L maintenance improvements recommended in the root cause investigation for this event.

Sincerely yours,

[ ( , =+ ._

~~

Walter G. MacFarland, IV Senior Vice President and ChiefNuclear Officer RSF/mlh ~

Enclosure cc: NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Regional Administrator, Region III, USNRC 1 Illinois Department ofNuclear Safety j Elgar Corporation l-L l~

l

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