ML19210A798

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Monthly Operating Rept for Nov 1977
ML19210A798
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 12/01/1977
From: Potts W
METROPOLITAN EDISON CO.
To:
Shared Package
ML19210A791 List:
References
NUDOCS 7910310683
Download: ML19210A798 (6)
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Text

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AVERAGE DAILY UNIT PC'4ER LEVEL pocgg; no, 50-289 in;I7 T'4I-1 DATE 12/1/II W. E. Potts COMPIETED BY TEL. NO. 215-929-3601, Ext. 11h November MCIE AVERAGE DAIIY PCWER LEVEL (f.Ne-Net) DAY AVERAGE DAILY PGIER TEVELf ?#,Je--Met )

DAY 1 795 21 798 7o0 22 802 2

785 23 801 3

h 781 2h 799 781 25 803 5

792 26 80h 6

788 27 805 7

793 28 803 8

793 802 9 29 791 803 10 39 11 803 33 80h 12 80h 13 338 1h 7C5 15 16 79I 786 17 I99 E*^ c. o 18 bJu) Ui] \

01 19 2 W 2910810 [3

/ERATING

SUMMARY

The unit operated at essentially 100% power for the entire =cnth except for the two brief unplanned forced reductions of November ik,1977 and November 17, 1977.

Monthly inspections of the Decay Heat Removal Pump shafts continue. In addition, the recirculation orifice on both Decay Heat Removal Pumps was removed in order to increase the minimum recirculation flow.

The unit tripped frc= 100% power at 0757 cn Nove=ber lh ,1977, due to a =cdule failure within the Integrated Centrol System (ICS) . The actual generated =egawatt signal feedback to the ICS failed icv causing the ICS to increase reactor power, steam, and feed ficv to correct for the seemingly large error between the =egavatt demand and actual generated negawatts. The Reacter protection System tripped the reactor approximately one minute after the ICS module failure. The =cdule was repaired and the unit was brcught back en line by 1620 hours0.0188 days <br />0.45 hours <br />0.00268 weeks <br />6.1641e-4 months <br />, November ik, and the unit attained full pcver by 2320 hcurs , November 15, 1977 While operating at 100% pcVer, the unit experienced an ICS "unback to 55% pcVer due to an erroneous Group One "in-limit" indication. The runback cecurred at Ihl3 hours on November 17, 1977. The errenecus Group One in-limit indication cleared by itself and the unit returned to full pcver by lhh8 hours , November 17, 1977.

Subsequent trouble shooting revealed excessive =cisture on the affected control rod position cable trays due to a leaking roof.

MAJCR SATETY RElATED MAIRE'IA' ICE Decay Heat pu=ps "A" and "3" were inspected during this =cnth for possible shaft defects. The following work / inspection was performed en each pump:

1. IED readings were taken
2. Pump to motor coupling removed
3. Ultrasonic test of pump shaft
k. Analysis of UT results 5 Ccupling of pu=p to =cter
6. Testing of pump and declaring purp operable 7 Return pump to service Each pump was taken cut of service separately to perform the above verk. Results of UT and IRD readings were satisfactory for both purps. All work performed on each pump was cc=pleted within the time limits se+ forth in the technical specificaticns.

DR-P-1A end bell was replaced after discovering a slight crack in the end bell. Work included:

1. Testing of redundant cc=pcr.ent
2. Disassembly of purp to =ctor coupling 3 Disassembly of notcr end tell
h. Replacement of end bell 5 IRD readings
6. Testing of pump and declaring pump operable 7 Returning pump to service Work was cc=pleted within time specifications set ferth in technical specificaticns.

Test results were satisfactory.

o

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1;tJIU1ARY : UNIT DIRffD(WNS AND PWER I(EIAJCTIONS Tha uni t. rnn nt. essentin11y 100% power for the entfre month except between 0757 and 1(15 on 11/lb/77 during wl:tch the- unit van rhutdown due to a flux / flow imbninnce reactor trip. The trip wan enus-41 t y t.he? ICS S1 pins-Conyertar "I," moduIe fa111ng to the zero yo1L pisItion. The sk>du1e DOCKET NO. 50-P09 w in replaced anel the unit returned to service. The ualt also expertenced a run back to 55%

p<, var nt I h l i on ll/IT/Tl due to a faulty in limit livlication on group 1 control rods. The (JNIT NAffE TMI-I l uni t wns r.+ turned to escentially 100% power by thh2 on 11/17/77 DATE IP/1/77 CU4P!1TED BY W. E. Potts TEL. NO. 215-%")-V41 Es t. Ilh RP2 RT MON 111 November METil(D OF TYI E SillflTING [0WN F-FORCED DURATide illE HEACTm (il No. liATE S-ScilE14JIED (fl0URS) REASON (1) REIUCING P(WER (2) COMMENTS 5 ll/lb/77 F 8.3 A 3 Failure of ICS M.wlule Gignal Converter "I," (ICS #?-2-1,3) caused reactor powec to increase above 103% F.P. Thus causing a flux / flow Imbalance trip.

I (1) REASUI (2) ME'11 rop:

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gggu(y ; UNIT SIRffMVNC AND P(WER NEIUCTIONS The ualt rnn at c=sentially 100% power for the entire mouth excelt tietween 0757 arel 1615 on 11/14/77 during which the unit 'was shutdrwn due to a flux / flow imbalance reacter trip. The trip was WN emuel by the ICS Sigdal-4'onverter "L" module fallina to t he zero volt p>uition. The a dule DOCKET NO.

waa reg. laced and the unit returned to service. The unit also ext.crienced a run back to $5%

gmer at l le l'1 on 11/17/77 dae to a faulty in limit ir,lication on group I control ruls. The UNIT NAME TMI-1 unit was returne<1 to ecsentially 10id g> we r by I k h 2 on 11/17/77.

DATE 1//l /TT C04PirTED BY W. E. I a' t s TEL. NO. Pl'. 4?). dLOl , Ex t , 113 IdP0HT W) NTH N verit er MF'IH G) fF TYPE SHlf1" TING IiOWN F-imhCED [AIBATIQ4 THE NEACTGt Gt NO. I> ATE S-SCHEICIED (HollHS) ItEASON (1) hEIUCING P(VEN (2) CtNMENTS 5 tt/lb/77 F 8.3 A 1 Failure or ICS blale Sl ynal Converter "L" (ICS #J-?-3,31 causel reactor p>wer t o inercase at we los% F.P. Thus causing a riux/ flow tubalance trip.

4 (1) FZASG4: (2) ME'lHOD:

" A-t%dUIIMEfrF FAIIDHE (EXPIAIN) 1-MANt!AL

(~-) B-MAINT. OH TEST 2-MANt1AL SCRAM C-REMIEIJ NG 3-AlfffMATIC SLM NREGillATORY RECTNICTICTI k-0THEH (EKPIAIN) d E-OPERATOH TRAINING ANI)

LICENSE EIAMINATI(#1 C3 F- AI4CNCTRATIVE CJ C-TEhATI(14AL Emit (EXPIAIN)

H- UIHER (EXPIAIN)

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