PNO-I-88-021, on 880216,licensee Commenced Power Decrease to Hot Shutdown Condition Due to Main Turbine Generator Stator Cooling Flow Problem.In Conjunction W/Ge,Licensee Plans Chemical Cleaning & Backflush Process of Sys

PNO-I-88-021:on 880216,licensee Commenced Power Decrease to Hot Shutdown Condition Due to Main Turbine Generator Stator Cooling Flow Problem.In Conjunction W/Ge,Licensee Plans Chemical Cleaning & Backflush Process of Sys

ML20149J395
Person / Time
Site:	Three Mile Island
Issue date:	02/17/1988
From:	Conte R, Cowgill C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-88-021, PNO-I-88-21, NUDOCS 8802230032
Download: ML20149J395 (2)

_ m % _,- _ . _ _ , , _ _ . _ ,. . , . _ _ ,_. - _ ;_.mm_m _ s_. _._ ,3

. DCS No: 50289880216

, Date: February 17, 1988 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-88-21 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.

Facility: GPU Nuclear Corporation Licensee Emergency Classification:

Three Mile Island, Unit 1 Notification of Unusual Event Docket Numbers 50-289 Alert Site Area Emergency General Emergency X Not Applicable

SUBJECT:

PLANT SHUTOOWN IN EXCESS OF 48 HOURS The licensee commenced a power decrease to hot shutdown condition at 7:00 p.m.,

February 16, 1988, because of a main turbine generator stator cooling flow problem.

Over the past week, the licensee noted indication of water flow clogging across the main generator in the stator cooling system. The installed resin system has been apparently ineffective in removing contaminants such as topper. There has been an apparent buildup of contaminates at the stator coolant flow passage entrances in the main generator stator. In conjunction with its vendor, General Electric, the licensee plans a chemical cleaning and backflush process of the system.

Safety-related work is also planned for the outage, such as "Furmaniting" secondary system steam leaks in the reactor building.

~

The shutdown proceeded without incident, twenty-four hour coverage of the shutdown was performed by the resident office at TMI-1.

The outage is expected to last 3-4 days. Criticality is predicted for r February 20, 1988.

This Preliminary Notification is issued for information only. Media interest is expected.

Region I received notification of this by telephone from the senior resident inspect at about 8:00 a.m. on February 17, 1988. The Commonwealth of Pennsylvania has been

informed.

CONTACT: R. Conte C. Cowgill -

i FTS 590-1167 FTS 344-5128 kkE2fy32B00217 '

[j PNO-I-se-pj ppg

)

'~

t

! *a I PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I i This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region I staff on I this date.

f Facility: O P(1r001karCc(locca b Licensee Emergency Classification:

'Thr4c yhi be. t s6+4 (14 l %tyicatin f Unusual Event b c c k d td o : 50-2.99 Site Area Emergency General Emergency K Not Applicable

Subject:

%,d $(Q8Wh io e.Kcass of 98 h q, l i carMM C A C. CM

~ to-star-t a power decrease to hot shutdown condition at i Thelicenge,ep,hgIdcauseofamainturbinegeneratorstatorcoolingflow 7:00 p.ml % J problem.

Over the past week, the licensee noted indication of water flow clogging across the main generator in the stator cooling system. The installed resin system has been apparently ineffective in removing contaminants such as copper. There has been an apparent buildup of contaminates at the stator coolant flow passage entrances in the main generator stator. In conjunction with its vendor, General Electric, the licensee plans a chemical cleaning and backflush process of the system.

y Safety-related work is also planned for the outage, such as "Furmaniting" steam leaks in the reactor building.

Se cm.dgm3 nph The outage is expected to last 3-4 days. d C h.$ s5 T"4M b ,'4, K lW-This Preliminary Notification is issued for information only. Media interest is expected.

Region I received notification of this by telephone from the senior resident inspect at about 8:00 a.m. on February K,1988. The Commonwealth of Pennsylvania has been informed. M CONTACT: R. Conte C. Cowgill t

L FTS 590-1167 FTS 344-5128

% SkMcn.gn p ,mluf w Mt W:du% We he hwr Cery ch f

, h42un wces pvfmd. h +b u r/dcd e f ic *M N M- ,

Region I Form 83 (Rev.. January,1983)

__ _______ _ ___ -