ML20244C222
| ML20244C222 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 03/31/1989 |
| From: | Fay C, Krause C WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-89-041, CON-NRC-89-41 VPNPD-89-211, NUDOCS 8904200100 | |
| Download: ML20244C222 (9) | |
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NARRATIVE
SUMMARY
OF OPERATING EXPERIENCE Docket No.
50-266 Unit Name Point Beach Unit 1 Date April 7, 1989
{
Completed By C. W. Krause l
Telephone 414/221-2001 l
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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 shut thereby under design basis accident conditions both trains of containment spray would be inoperable.
LER 89-001 for Unit 1 is being drafted to document the event.
Safety related maintenance includes the annual overhaul / inspection on G01 emergency diesel generator, replacement of the P32B service j
water pump motor, repair of the anti-rotation device on P32C l
service water pump, and replacement of site glass gaskets on P36A auxiliary feed pump.
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. NARRATIVE
SUMMARY
OF OPERATING EXPERIENCE
-Docket No.
50-301 Unit Name Point Beach Unit 2 Date_
April 7, 1989 Completed B C. W. Krause Telephone. y 414/221-2001 Unit 2 operated at approximately 499 MWe net throughout the period until the unit tripped at 8:43 a.m. on March 29, 1989.
The deluge system actuation of the c phase transformer caused an apparent flashover of the transformer to ground.which was detected by protective relaying (transformer differential).
This caused a Unit 2 generator lockout which tripped the. generator breaker and 345 kV breakers 3-4 and 4-5 isolating bus section 4 which is fed by the Unit 2 generator.
The trip caused by a generator lockout with reactor power >50% is the 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 kV system was' returned to. normal lineup, i.e.,
bus section 4
-reenergized, the emergency diesels returned to normal automatic standby 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-89-211 NRC-89-041 p
April 10, 1989 p.
U.~ S. NUCLEAR REGULATORY COMMISSION Document Control' Desk
- Mail-Station F1-137 Washington,'D.
C.
20555 Gentlemen:
DOCKETS 50 -266 AND-50-301 MONTHLY OPERATING REPORTS POINT 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 l
.Vice President Nuclear' Power Attachments
' Copies to R.
S.
Cullen, PSCW NRC Regional Administrator, Region III NRC Resident Inspector
, 8
_