ML19308B809
| ML19308B809 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/17/1979 |
| From: | Brazill G, Dunn B, Womack E BABCOCK & WILCOX CO. |
| To: | Fairburn T, Ham R BABCOCK & WILCOX CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001170336 | |
| Download: ML19308B809 (2) | |
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D15TRIBUT IOi 3,.SE2, 0 '; "' '"
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R. E. H/Ot/G. T. FAIRBUR'i, NUCLEAR SERh*REFONSE. REQ'D FROM1" c. 7 * "_ n hhb 1
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G. J. BRAZILL, PLANT INTE RATION File No.
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T3.35 DPC, MET ED, FPC, AP 5L, ShPJD, TECo Date S u bj.
SUPPLE)!ENTARY OPERATING INSTRUCTIONS FOR HPI APRIL 17, 1979 bm.................................-.-,.
XeLL.'l MEMD RE:
G. T. FAIR 3 URN TO DISTRIBUTION, SAME SUBJECT, T3.35, V03/ ( 19~/ ~/
APRIL 4, 1979.
THE OPERATING INSTRUCTIONS, GIVEN IN THE AE0VE REFERENCE, FOR OPERATOR ACTION TO OVERRIDE THE ENGINEERING SAFETY FEATURES ACTUATION SYSTEM AND TEP.MINATE HPI HAVE BEEN REVISED.
THIS RIVISION (ATTACHED) ALLOWS THE OPERATOR AN ALTERNATIVE TO THE 20. MINUTE OPERABILITY PERIOD, UNDER CERTAIN CONDITIONS, TO PRECLUDE THE PRESSUR'IZER FROM GOING SOLID.
PLEASE REVIEW
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"1 AND TRANEMIT THESE REVISED INSTRUCTIONS TO ALL AFFECTED B5W i
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CUST.0ME PS.
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l -" " - - ENGI'NEERING DEPARTMENT REVIEW 5 APPROVAL
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DUNN, UNIT MANAGER, ECCS T E'.. E. E. A. WOMAC K, */XN AGE R, P LANT DES I GN
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R@!!EWED FOR. ACCURACY- -
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L. R. Carti.
D. F. Hallman E.'W.
Swan. con B. M. Dunn R. E. Kosiba J. H. Taylor N. S. Elliott D. W. Labelle R. W. Winks R. J. Finnin D. H. Roy E. A. Womack m_
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SUPPLEMENTAL OPERATING INSTRUCTIONS FdR HPI SYSTEM OPERATION
. T ALTHOUGH DETAILS OF THE CAUSES AND COURSE 0'F EVENTS OF THE INCIDENT AT METROPOLITAN EDISON'S TMI-2 PLANT ON MARCH 28, 1979 ARE STILL BEING DEVELOPED, IT APPEARS THAT THE INCIDENT WAS INITIATED BY A LOSS-OF-MAIN FEEDWATER FLOW (LOFW) AND THAT A DISTINGUISHING CHARACTERISTIC OF THIS TRANSIENT COMPARED TO OTHER PREVIOUS LOFW TRANSIENTS WAS THE SECURING OF THE HIGH PRESSURE INJECTION (HPI)
SYSTEM.. CONSEQUENTLY, ALL OPERATING PLANT.5, ARE ADVISED TO IMPLE-MENT THE FOLLOWING DIMEDIATELY:
IF THE HPI SYSTEM HAS ACTUATED BECAUSE OF LOW PRESSURE CONDITION, IT MUST REN h IN OPERATION UNTIL ONE OF THE FOLLOWING CRITERIA IS SATISFIED:
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BOTH LPI PUMPS ARE IN OPERATION AND FLOWING AT A RATE IN EXCESS OF 1000 GPM EACH AND THE. SITUATION HAS BEEN STABLE FOR 20 MINUTES.
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THE HPI SYSTEM HAS BEEN IN OPERATION FOR 20 MINUTES AND ALL HOT AND COLD LEG TEMPERATURES ARE AT LEAST 50 BELOW THE SATURATION TEMPERATURE FOR THE EXISTING RCS PRESSURE.
IF 50 SUBC00 LING CANNOT BE MAINTAINED, THE HPI SHALL BE
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REACTIVATED.
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.4 OR 3.'
kl.L ljoT AND COLD LEG TEMPERATURES ARE AT LEAST 50
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BELOW THE SATURATION TEMPERATURE FOR THE EXISTING RCS PRESSURE, AT"LEAST ONE RC PUMP IN EACH LOOP IS RUNNING, AND THE ACTION IS NECESSARY TO FREVENT THE INDICATED PRESSURIZER LEVEL FROM GOING O'FF-SCALE HIGH.
It SO SUBC00 LING CANNOT.BE MAINTAINED, THE HPI SHALL BE REACTIVATED.
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IF THE ilPI SYSTEM !!As BEEN ACTIVATED AND IF RC PUMPS ARE IN
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OPERATION, AT LEAST ONE RCP PUMP PER LOOP S110ULD BE MAINTAINED.
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