ML19210A794
| ML19210A794 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/07/1977 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Mcdonald W NRC OFFICE OF MANAGEMENT AND PROGRAM ANALYSIS (MPA) |
| Shared Package | |
| ML19210A795 | List: |
| References | |
| GQL-1372, NUDOCS 7910310680 | |
| Download: ML19210A794 (2) | |
Text
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NRC PoRu 195
.s.s. NUCLEAR REGULATORY CG ' JISSION DOC ET NUM BE R M=hhh (2 76)
PILE NUMBER NRC DISTRIBUTION PoM PART 50 DOCKET MATERIAL gg,f p g. g.,,
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FROM:
oATE cP DOCUMENT Metropolitan 3dison Company 10/7/77 Mr. W. G. Mcdonald Reading, Pa.
oATE RECEivEo J. G.
Herbein 10/28/77 kETTER ONOTCRIZED PRCP lNPUT PORM NUMSEft CP CCPIES RECEIVED CoRiciNAL
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CESCRIPTION ENCLOSU R E Letter trans the folleving:"
Monthly Report for September 1977 Plant & Ceepenent Cperability & Availability.
This Report to be used in preparing Gray Beck by Plans & Operations.
PLANT NAME: Three Mile Island Unit No.1 RJL 10/28/77 (1-P)
(5-P)
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POST OFFICE BOX 542 READING, PENNSYLV ANI A 19603 TELEPHONE 215 - 929-3601 October 7, 1977 GQL 1372 Director.cf Nuclear Reactor Regulation 7
Attn:
Mr. W. G. Mcdonald, Director
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Office of Management Information and Progrc.m Control U. S. Nuclear Regulatory Ccemission f' '
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Dear Sir:
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Operating License No. DPR-50 Docket No. 50-289 Enclosed please find the September Operating Report for Three Mile Island.Fuclear Station, Unit 1.
Per Mr. R. W. Reid's letter ~of '
September 19, 1977, we have modified the centent of the Operating Report to include a " Narrative Summary of Opertting Experience".
incerel,
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J.GbHerbef1 Vice Presi/ ent JGH:DG'4 : tas Enclosure A,
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SUMMARY
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14,1977 at 2320, when Tril-1 operated at essentially full power until September the Unit reduced power to 50% in order to investigate the cause of what appeared to be condenser tube fouling. While operating at 50%, inspection of the condenser revealed some tube blockage and significant screen blockage of the "Amertap" Condenser Cleaning System.
As a result of the contamination of the condensate and feedsater systems on 9/16/77 with I.W.T. Regeneration Acid, OTSG's Chemistry went out of specification in conductivity and pH, and forced the Unit to be immediately shutdown.
On 9/19/77, af ter commencing plant heat-up, the "A" Reactor Coolant Pump tripped Plant heat-up was delayed to inspect and repair on overload when started.
RC-P-1A.
Approxicately 6 inches of one phase of the RC-P-1A motor lead had been destroyed due to a loose connector at the motor.
Repair of RC-P-1A and subsequent inspection of the connectors in RC-P-18 and RC-P-10 further delayed plant startup.
On 9/24/77 while increasing the generator field voltage in p' reparation for closing the main generatcr breakers, the generator and turbine tripped due to a generator The Bus Duct had ground within the Isolated Phase Bus Duct Cooling System.
collected moisture while the unit was off the line and once this moisture was removed, the ground was corrected.
On 9/27/77 the unit was brought back on line and remained at full power..for the remainder of the month.
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r,91. I T/P PAJOR SAFETY RELATED MAINTENANCE Decay Heat Pomos l A and IB The Decay Heat Pumps lA & IB were inspected during this month for possible shaft defects per NRC request.
The following work / inspection was performed on each pump:
1.
IRD readings were taken.
2.
Pump to motor coupling removed.
3.
Ultrasonic test of pump shaft.
4.
Analysis of UT results.
5.
Coupling of pump to motor.
6.
Testing of pump and declaring pump operable.
7.
Return pump to service.
Each pumo was taken out of service separately to perform the above work.
Results of UT and ?.D readings were satisfactory for both pumps.
All work performed on each pump was completed within the time limits set forth in the technical specifi-cations.
Reactor Ccolant Pumo 1A Cn September 19, 1977, while s arting the RC-P's for plant startup, RC-P-1 A tripped due to loss cf voltage.
Inscection of RC-P-1A's motor leads revealed a phase to ground short had occurred near tne local bus and cable connections.
Repairs included removal of ta:e from cable isads and local bus bar, cleaning of cable and bus bar connections, replacement of cable from motor to local bus bar, tightening of all connecticas, retappig, disconnecting and replacing surge capacitor, meggering of motor, replacing panel covers, testing pump and returning pump to service.
During the repairs of RC-P-1A, RC-P-1B & 1D motor connections were also inspected.
The inspections included remeval of tape from motor leads and local bus bar connec-tions, checking connections fcr signs of deterioration, cleaning and tightening connections, reta@ing, disconnecting of surge capacitor, meggering of motor, reconnecting surge capacitor, replacement of panel covers, testing of pumps, and returning pump to service.
Results of inspections were satisfactory.
The cause of the short is presently under investigation.
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