United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9707220238



July 18, 1997



In response refer to:    Ref. a) Elgar letter 970422.ecn, 18 July, 1997

97-01-21.21                   b) G.E. Spec. 22A3153, Rev 5

                              c) ECN N960467A



Illinois Power Company

Clinton Power Station

PO Box 678

Mail Code V920

Clinton, IL 61727



Attention:     Mr. Joseph Sipek, Director of Licensing

               Fax: (217) 935-5864



Subject:       Advisory Report, 10 CFR 2; UPS 103-1-189 Possible

               Quality Problem.



The purpose of this letter is to report a possible 10 CFR 21 reportable

condition for your evaluation and action as appropriate.



Reference a) reported an error which occurred in an earlier Engineering

Change.  Specifically, R47 had been incorrectly installed on the Electric

Power Assembly (EPA), which is a subassembly of UPS 103-1-189. Reference

a) addresses cause and corrective action for this problem and notes that

Elgar's analysis confirms that the error does not cause any degradation

to Class IE systems/functions.  However, based on a review of historical

information regarding the evaluation which led to the incorporation of

R47, it appears that the EPA board does not meet all specifications

required by reference b) and therefore may cause degradation of the

Reactor Protective System as defined in paragraph 4.3-5.6.3 and related

paragraphs.



Specifically, paragraph 4.3.5.6.3, revision 5 of G.E. Specification

22A3153 requires that power being supplied to the load by the UPS be

disconnected if an abnormal voltage or frequency condition exists for a

duration of four (4) seconds or more. The Elgar Engineering

investigation, conducted at Clinton Power's request and which resulted in

reference c), determined that while the under/over-frequency circuit can

be calibrated to meet the four (4) second delay threshold, the

under/over-voltage detection circuit cannot meet this specification due

to the R-C Time Constant of the over-voltage circuit input filter

components, which by themselves exceed the four (4) second threshold.

Elgar recommends that Illinois Power Company evaluate the timing delay

requirements applicable to the Reactor Protective System to determine if

actual performance Is degraded and that Illinois Power take action as

appropriate.  Elgar Corporation is prepared to assist in this effort at

your request.



A hard copy of this correspondence will be mailed to the primary

addressee.  Please contact Ray Daniel or Rob Huft as the primary Elgar

contacts regarding this matter:



     Ray Daniel                         Rob Huft

     Phone: (619) 458-0206              (619) 458-0247

          Fax: (619) 458-0267           (619) 458-0267

     E-mail- rayd@elgar.com             robh@elgar.com



Sincerely,



Raymond D. Daniel

Director, Quality Assurance



cc:  NRC Operations Center [Fax (301) 816-5151]; excluding references.



     Illinois Power -    Roger Gillenwater, Supplier Quality; Don

                         Lukach, Engineering



     Elgar Corp.    -    Ken Kilpatrick, Pres.; Rob Huft, Quality Mgr.;

                         Bill Gaedke, Sustaining Engineer; Tom

                         Moshenrose, Nuclear Customer Service Mgr



POWER REACTOR                                EVENT NUMBER: 32648



FACILITY: CLINTON        REGION: 3      NOTIFICATION DATE:  07/18/97

UNIT: [1] [ ]  [ ]       STATE: IL      NOTIFICATION TIME:  16:55 [ET)

RX TYPE: [1] GE-6                       EVENT DATE:         07/18/97

                                        EVENT TIME:         12:00[CDT)

NRC NOTIFIED BY: RAY DANIEL,

     ELGAR CORP.                        LAST UPDATE DATE: 07/18/97

HQ OPS OFFICER: DICK JOLLIFFE



                                                  NOTIFICATIONS

EMERGENCY CLASS: NOT APPLICABLE

10 CFR SECTION:                         JOHN MADERA         RDO

CCCC 21.21          UNSPECIFIED PARAGRAPH

                                        VERN HODGE NRR



UNIT  SCRAM CODE   RX CRIT  INIT PWR  INIT RX MODE  CURR PWR CURR RX

MODE



1         N           N       0      COLD SHUTDOWN     0   COLD SHUTDOWN



                               EVENT TEXT



-POSSIBLE 10CFR21 REPORTABLE CONDITION RE POTENTIAL DEGRADATION OF

RPS

UPS-



GENERAL ELECTRIC SPECIFICATION #22A3153, REVISION 5, PARAGRAPH 4.3.5.6.3

REQUIRES THAT POWER BEING SUPPLIED BY REACTOR PROTECTION SYSTEM

(RPS)

UNINTERRUPTIBLE POWER SUPPLY (UPS) #103-1-189 BE DISCONNECTED IF AN

ABNORMAL VOLTAGE OR FREQUENCY CONDITION EXISTS FOR A DURATION OF 4

SECONDS OR MORE.



AN ENGINEERING INVESTIGATION CONDUCTED BY ELGAR CORPORATION, SAN

DIEGO,

CA, AT CLINTON'S REQUEST, DETERMINED THAT WHILE THE

UNDER/OVER-FREQUENCY

CIRCUIT CAN BE CALIBRATED TO MEET THE 4 SECOND DELAY THRESHOLD, THE

UNDER/OVER-VOLTAGE DETECTION CIRCUIT CANNOT MEET THIS

SPECIFICATION DUE

TO THE R-C TIME CONSTANT OF THE OVER-VOLTAGE CIRCUIT INPUT FILTER

COMPONENTS, WHICH BY THEMSELVES, EXCEED THE 4 SECOND THRESHOLD AT

CLINTON.



ELGAR CORPORATION RECOMMENDS THAT CLINTON EVALUATE THE TIMING

DELAY

REQUIREMENTS APPLICABLE TO THE REACTOR PROTECTION SYSTEM TO

DETERMINE IF

ACTUAL PERFORMANCE IS DEGRADED AND THAT CLINTON TAKE ACTION AS

APPROPRIATE.  ELGAR CORPORATION IS PREPARED TO ASSIST IN THIS EFFORT

AT

CLINTON'S REQUEST.



ELGAR [Illegible print]

9250 Brown Door Road

San Diego, Ca 92121

PHONE:    (619) 460-0085

FAX:      (619) 458-0267

          (619) 468-0225



                              QA Department

                             Fax Cover Sheet



Date: 7/18/97                      Fax #:    301-816-5151

To:  NRC Operations Center         No. of Pages to Follow: 2



From: Raymond Daniel



Message:

          See Attached letter.



*** END OF DOCUMENT ***

Page Last Reviewed/Updated Thursday, March 29, 2012