ML20024B482

Summary of 790416 Meeting Re Operational Limits Which Should Govern Operator Actions to Secure or Terminate HPI

ML20024B482
Person / Time
Site:	Three Mile Island
Issue date:	04/18/1979
From:	Cartin L BABCOCK & WILCOX CO.
To:	Brazill G, Dunn B, Elliott N BABCOCK & WILCOX CO.
References
TASK-01, TASK-02, TASK-07, TASK-1, TASK-2, TASK-7, TASK-GB GPU-2707, NUDOCS 8307090007
Download: ML20024B482 (4)

Text

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.'A MEETING MINUTES ON HPI OPERATION PROCEDURE -

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8. M. DUNN D. L.'HOWELL':

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L A MEETItiG WAS HELD ON APRIL 16TH 'TO DISUCSS THE OPERATIONAL LIMITS WHICE

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SHOULD GOVERN OPERATOR ACTIO!is TO SECURE OR TERMINATE HPI. THIS MEETING r

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WAS VIEWED AS THE FIRST. STEP TO EXPAND PREVIOUS CONSIDERATION ON THIS i

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4 ;;j SUBJECT TO COVER ALL POTENTIAL OPERATI0t:AL MODES AND TO ELIMINATE OR MODIFY ,

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.'&. .]..y THE. IMPOSED TIME /SUBC00LIliG LIMITS.

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- " '1 TABLE 1 PROVIDES A LIST OF ITEMS TO BE CONSIDERED BOTH IN THE 'LONG' AND '

t d SHORT TERM. THE IDENTIFIED SCHEDULE. IN GENERAL, REFLECTS A COMBINATION  !

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! -OF PRIORTIES AND PROBLEM COMPLEXITY. . ITEMS 1-4 WERE CONSIDERED TO SOME '

l EXTEtiT IN THIS FIRST MEETING,AND A

SUMMARY

OF THE DISCUSSIONS AND/OR CON-

. [j CLUSIONS FOR EACH IS' PROVIDED BELOW. ITEMS 6 & % WHICH RELATE TO LONG TERM

- j RECOVERY FROM OPERATIONAL MODES WHICH RESULT IN A SOLID PRIMARY SYSTEM AND

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THERMAL' SHOCK EFFECTS ON THE RV'At:D COLD LEG PIPING DUE TO THE INJECTION OF

,. 3 COLD'HPI WATER WILL'BE DISCUSSED AT A LATER DATt. .

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SOF SUCC00 LING LIMIT & INSTRUMENTATION LIMI'TS -

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THE ESTABLIS'IMEriT AND MAINTENANCE OF A'50F SUBC00 LING LIMIT PRIOR TO TERMI-8307090007 790418

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MEETIliG HINUTES ON HPI OPERATIOfiAL PROCEDURE APRIL 18, 1979 [

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NATI0tl 0F HPI WAS ORIGIriALLY INTE!iDED' TO COVER BOTH THE REQUIRED THERMAL F MARGIfiS AND AllTICIPATED. IllSTRUMENT ERROR. IT WAS CONCLUDED THAT THE 50F J

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. SUBC00LIllG LIMIT SHOULD BE REPLACED WITH P-T CURVES TMft INCORPORATES A 20F i L

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./ SUCC00 LED l%RGI!! PLUS APPROPRIATE ItiSTRUMENATION ALLOWAliCES WHICH WILL RE- S-

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D FLECT ACTUAL EXPECTED.DEVIATIO!iS. CONSIDERATIONS CAft THEN BE GIVEN TO THE h

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.j ACTUALINSTRUMENTSAPIDREADOUTCAPABILITIESAVAILABLE(E.G.,NARROWRANGE 4 p

. VSWIDERAtiGEPRESSUREANDCOMPUTERVSINDICATIORSVSSTRIPCHARTRECORDERS). ,

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20 MIN TIME LIMIT-IMPACT Ofi OVERC00 LING /DEPRESSURIZATION TRANSIENTS [h

' x THE 20 MINUTE TIME LIMIT PROVIDEC.IS T.:TET.EM E i WAS ORIGINALLY DEVELOP A 0  ;

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ENSURE THAT THE OPERATOR DOES !!OT BASE HIS DECISION TO TER!!!NATE HPI FLOW cc

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.6 ON SYSTsl CONDITIO!!S EARLY IN THE TRAfiSIEriT WHICH WOULD NOT INDICATE LONG 21 Gy .

~ h TERM TRENDS. THIS TIME LIMIT HAS COME UNDER CRITICISM FROM WITHIN B&W AND /

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. FROH SEVERAL CUST0*' IRS SECAUSE, UtiDER CERT'AIN CIRCIESTAfiCES. THIS " WAIT PERIOD" f.$

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s .MAY RESULT IN THE HPI'S PUMPING THE SYSTEM SGLID WITH WATER RELIEF OUT THE -

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CODE SAFETY VALVES.1 D. HOWELL PRESENTS RESULTS, FROM SOME SCOPING STUDIES i',

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IITILIZING THE OFR SIMULATOR FOR NON-LOCA DEPRESSURIZATION EVENTS, WHICH CON- i .'

TF FIRMED THAT WATER RELIEF VIA THE SAFETY VALVE WAS A DISTIliCT POSSIBILITY IF A ( ..

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. 20 MINUTE WAIT PERIOD'IS MANDATORY. THESE SIMULATIOriS ALSO EXAMINED THE 7 .

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ABILITY OF THE OPERATOR TO CONTROL P&T WHEN THE PRESSURIZER HAS BEEN PUMPED }.

' fl. 2 SOLID. SEVEP.AL ' ATTEMPTS TO C00LDOWN AfiD DEPRESSURIZE WERE MADE. A!!D IT WAS 7

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FOUiD THAT PRESSURE SWINGS IN A SOLID PODE RESULTED IN V'IOLATION OF THE 50F

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.53 SUBC00 LING LI!!IT AllD FULL DECOMPRESSION LIMITS. m "

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IT WAS TEliTATIVELY CONCLUDED Tl!AT ,THE 20 MIfiUTE WAIT PERIOD COULD BE ELIMINATED. ,

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PROVIDED THAT ACTION TO TERMINATE HPI SE TAKEfi ONLY IF A SOLID PRESSURIZER 15 6

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MEETING MINUTES ON HPI OPERATIONAL PROCEDURE -APRIL 18,1979 25 .

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EMINENT (I.E.,PRESSURIZERLEVEL/PRESSUREINCREASING)'. THIS CHANGE WOULD 'l.

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ALLOW THE OPERATOR TO TERMINATE HPI DURING OVERC00 LING EVENTS (N0:1-LOCA)

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AND TO PREVENT STEAM OR WATER RELIEF OUT THE PRES $URIZER CODE SAFETY OR l-%

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RELIEF VALVES. R. O. V05 BURGH INDICATED THAT THIS REVISED POSITION WOULD

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NOT IMPACT THE ACCIDENT ANALYSIS RESULTS FOR CHAPTER 15 EVENTS. B. M. DUNN '3-

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WAS ASK.' HOWEVER, TO RE-EVALUATE THIS POSITION TO DETERMINE IF CORE COOLING 5

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COULD BE COMPROMISED FOR ANY POTENTIAL LOCA'S (I.E. 50F SUBC00 LING ON @

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.'n.4 RTD'S MAY NOT INDICATE A SOLID SYSTEM DURING A LOCA). CONFIRMATION OF THIS M e,o

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, TABLE 1: REVIEW ITEMS FOR HPI TERMINATION CRITERIA-g

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1. REASSESS REQUIREMEtiT FOR 50F SUBC00 LING LIMIT (BY APRIL .

20TH). $

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2. DEFINE INSTRUMENT ERROR IN RELATIONSHIP TO THE SOF SUEC00 LING 8.IMIT-it.

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3. DOCUMENT BASIS FOR OR ELIMINATE 20 HI!UTES OPERABILITY TIME PERIOD E'

.T T PRIORTOHPITERMINATION(BYAPRIL20TH)..

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~f -4. EVALUATE IMPACT OF OPERATING INSTRUCTION ON ALL ANTICIPATED EVENTS Id

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.: E 5. REFINE PROCEDURE TO INCLUDE SELECTIVE TRIPPING AND/0R THROTTLING OF - R

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HPI AND USE OF ALL AVAILABLE INSTRUMENTATI'ON (BY APRIL 20TH).

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' ." ,.' 6. LONG TERM RECOVERY FROM " SOLID SYSTEM" .dPERATION .

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