U-601942, Revised Special Rept Re non-valid Test Failure of Div I DG, Describing Correct Steps Involved in Synchronizing DG W/ Offsite Power.Dg Output Voltage Adjusted Such That It Is Slightly Higher than Offsite Power Voltage

Revised Special Rept Re non-valid Test Failure of Div I DG, Describing Correct Steps Involved in Synchronizing DG W/ Offsite Power.Dg Output Voltage Adjusted Such That It Is Slightly Higher than Offsite Power Voltage

ML20094H219
Person / Time
Site:	Clinton
Issue date:	03/02/1992
From:	Spangenberg F ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-601942, NUDOCS 9203090173
Download: ML20094H219 (1)

Text

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,h #. 1%na.s Power Company CW, ton Paser S%en P O iku 070 Ci nien. il 61727 Tc4 217 9M foi t iLLINr5lS u. co1%,'

POWER 1.47 92co3-o2>1.P BE.100c

!!a rch 2, 1402 10CFR50.36 Docket !1o. 50 461 Document. Cont.rol Desk tiucicar 1%gulatory Conunission Washington, D.C. 20555

Subject:

Revision to a Previous Special Report Regarding a Non. valid Test Failure of the Division 1 Diesel Generatol lt Clinton Power Statton (CPS) _

Dear Sir:

This letter is being provided to correct an error contained in a Special Report recently submit'.ed by Illinois Power (IP) (reference IP letter U.

601931 dated February 5, 1992). The report addressed the occurrence of a non-valid failure of the Division I diesel generator at CPS due to a reverse power ttip while synchronizing the diesel generator to offsite power during a routine surveillance test.

IP's report incorrectly described one of the steps involved in synchronizing a diesel generator with offsite power. Speci fically , the Special Report stated that, just prior to synchronization, the diesel generator's output voltage is adjusted with its voltage regulator control

! switch such that the diesel generator's output valtage is slightly lower then me ef fcito rea.:r voltaga . The Spaia' R: port zhoul d ha.e tate.! that the diesel generator's output voltage is adjusted such that it is slightly hil2her than the offsite power voltage. This correction is consistent with the procedural requirements of surveillance procedure 9080.01, " Diesel Generator 1A(18) Operability-Manual."

I regret any confusion this error may have caused.

$g Sincerely yours, N no s, O p, Q5 oo ( c n

I Nn 0o F. A. Sparigenb g, 111

. ng Manager, Licensing and Safety i ro 1 -O 0Q DAS

&< n,. . /alb g cc: NRC Clinton Licensing Project Manager - g

~

NQ tiRC Resident Off'.ce g/'yv^)(

i i 0 n.to Regional Administrator, Region III, USNRC f Illinois Department of Nuclear Safety ,/l

. .. .