ML20136C259
| ML20136C259 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 09/12/1979 |
| From: | METROPOLITAN EDISON CO. |
| To: | |
| References | |
| TM-0895, TM-895, NUDOCS 7909170696 | |
| Download: ML20136C259 (7) | |
Text
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DOCUMENI NO: N"
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COPY MADE ON OF DOCUMENI PROVIDED BY ,,.
. METROPOLITAN, EDISON COMPANY..
Supervisor; Docussent Control, NRC. . e W* e . e 7 - a 9 dS17 0676
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RA)l0 LOGICAL REF.#
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[nves6ic a tor's NameOvhe i 1 l 1 i cal Reference : . . Source for tMs Radio >'o9
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I . Tha follcwing chronology .was dictated to'W. .J. Bubbc) Marshall by ) HUGH MCGOVERN (CRO) at approximately 0300,' March 29,1979. A copy of the handwritten transcript is attached. p
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0700 Came in, had 'just declared site emergency. PER' was ' solid, steaming ~ ' - . through 2 circ water pumps running, both atmospheric dumps were lifted - as noise from MS relief valve speaker.
. c p 0715 Started 2nd set of cire water pumps, atmospheric dumps shut - both by-c passes were controlling header pressure. .
a 0730' Isolated B S/G closed MS-V4 4 7 4 15 (B). Lynn Wright was isolating feed at this time. , p 0800 Had a prcblem with gland steam - attributed to Unit 1. aux boiler problems-
' started losing vacuum - isolated gland steam spill E spill bypass'.
0750 Stopped SF-P-1A isolated BWST receive line. . , y 0900 started aux building and fuel handling building exhaust fans also started AH-E-4B (control room recirc) . c
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g 1100 Isolated HP-R-227 from Rx building and secured it. During the above time frame - E.P. injection was started and stopped several times - also RC-
- R-V2 was cycled to relieve PZR pressure. 13C-D-T had 0 pressure, N 2250F established leakage close but could not keep temperature down , level' in-dicator less than 70 and pumps did not- have suction press indicating the contents of RC-D-T had flashed. Rx building pressure increased when RC-RV-2 was cycled and at p 3.5 psi RB isolation and cooling was initiated, went once was defeated and opened isolations for NC 4 IC. Pressure ,
decrease when RC-RV-2 was shut. But came back up as RC-R-V2 was cycled
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. about 45 minutes to 60 minutes after 1st RB isolation received 2nd actua-
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f ' ' tion on Rx building pressure - this was around 1200 or 1300 hrs. (-.,; - - O . _ . ._ . _ , f *{
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m 1400 Had's load of 2-32A 4 2-42A loss of radiation ar.ea monitors and a.n Rx
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,. building pressure spike that.went off' scale en narrow i-inge meter -
definite spike straight up,' straight back down -' had meter - definite *
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. spike straigh't up, straight back down - had full Rx building (Spray ,, ,
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pumps 4 BS-VPS/ DH-V8's) isolation 'and cooling. Someone secured spray pdmps, shut BS-Vi's and DH-V's (Hugh did) and unisolated equipment for building. . f V 1500 Took the panel - at time had bubbles in 'both hot legs with both Th e
' instruments pegged. PZR was solid. Were taking water from.BWST U A DH-VS A6B 4 MV-P-1B running continuously and MU-P-IC*as necessary to control MV.T-1 level. MV-V-16B 'was open and thruttled to 100 gym, MV-V17 4 MV -
V18 were open, with max letdown 120 to 130.GPM. M'anaged to collapse bubble in A loop hotleg as evidenced by Th A loop decreasings to 5900F. When this happened tried to do the same thing to B loop by opening MV-V16C with MV-P-lC." This' didn't work '- Th in A loop went back up off scale and B , loop Th didn't change. PER heaters on at this time with RC-R-V2 open. Shut stopped MU-P-IC and shut MW-Y16C. About 10 minutes .
. later Th A loop came back down again. PER level dropped to /./ 395. At (,
this time, isolated RC-RV2. Bf shutting RC-V2. PER level started to - drop again in about S minutes, and dropped rapidly to 150", MU-T-1 level .
- 'was decreasing also MU-P-1B 4 C were running MU-V-17 in auto and. full . _ _ ,
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open (setpoint 200") MU flow was 150 dPM (makeup to) MU-V16C throttled
- to 200 GPM. At 'this time PER heaters were de-energized and lifted RC- , _
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- - - V132 momentarily. . 1his stopped , decrease'and PZR level was_ established at', ,
t I 175".
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. ~ - x _., Filled SOK tank to about 1.0 ft. At this time "A" atmospheric dump was. . . . _ j g 1200 . . l
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only line relieving.
, 1 Letting down to C bleed tank level about 11.5 ft. switch'ed to B bleed .. u 0800 ..
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