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NARRATIVE SUMMARY OF OPERATING EXPERIENCE

Docket No. 50-266Unit Name Point Beach Unit 1Date April 7, 1989

{Completed By C. W. Krause |.

Telephone 414/221-2001 !l

)i

Unit 1 began and ended the period in end-of-life stretch !

operation with power level decreasing as the core burns up.

During maintenance of G01 emergency diesel generator, the {" opposite train" containment spray pump discharge valve was shutthereby under design basis accident conditions both trains ofcontainment spray would be inoperable. LER 89-001 for Unit 1 isbeing drafted to document the event.

Safety related maintenance includes the annual overhaul / inspectionon G01 emergency diesel generator, replacement of the P32B service jwater pump motor, repair of the anti-rotation device on P32C |service water pump, and replacement of site glass gaskets on P36Aauxiliary feed pump.

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. NARRATIVE SUMMARY OF OPERATING EXPERIENCE

-Docket No. 50-301Unit Name Point Beach Unit 2Date_ April 7, 1989Completed B C. W. KrauseTelephone. y 414/221-2001

Unit 2 operated at approximately 499 MWe net throughout theperiod until the unit tripped at 8:43 a.m. on March 29, 1989.

The deluge system actuation of the c phase transformer caused anapparent flashover of the transformer to ground.which was ;detected by protective relaying (transformer differential). Thiscaused a Unit 2 generator lockout which tripped the. generatorbreaker and 345 kV breakers 3-4 and 4-5 isolating bus section 4which is fed by the Unit 2 generator.

'

The trip caused by a generator lockout with reactor power >50% isthe initiating condition requiring an Unusual Event emergency I

classification. This was declared at 8:54 a.m. All company,county, state, and NRC notifications were completed by 9:04 a.m.

Unit 2 remained in an Unusual Event until'the switchyard 345 kVsystem was' returned to. normal lineup, i.e., bus section 4-reenergized, the emergency diesels returned to normal automaticstandby status, and steam generator sample confirmation that the ,

'

trip did not cause a significant increase in Unit 2 primary-to-secondary leakage.

The Unusual Event was terminated at 12:05 p.m.

LER 89-001 for Unit 2 is being drafted to document the event.

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Wisconsin Electnc eowen cove ur,

231 W. MICHKIAN, P.O. BOX 2046, MILWAUKEE, Wl 53201(414)221 2345

7

VPNPD-89-211NRC-89-041

p April 10, 1989 ,

p.

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U .~ S . NUCLEAR REGULATORY COMMISSIONDocument Control' Desk: Mail-Station F1-137Washington,'D. C. 20555

Gentlemen:

DOCKETS 50 -266 AND- 50-301 -

MONTHLY OPERATING REPORTSPOINT BEACH NUCLEAR PLANT, UNITS 1 AND 2

Attached are monthly cperating reports for Units 1 and 2, Point.t

! JBeach' Nuclear Plant, for the calendar month of March 1989.

Very truly,yours,

f

.ggv~ \

C. W. ay |

.Vice PresidentNuclear' Power

,

,

Attachments

' Copies to R. S. Cullen, PSCWNRC Regional Administrator, Region IIINRC Resident Inspector

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