ML20024B482

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

ML20024B482
Person / Time
Site:	Crane
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)

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.'A MEETING MINUTES ON HPI OPERATION PROCEDURE -

APRIL 18,1979 8':10 a.m.

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-NE G. J.' BRA'ZILL D. L.'HOWELL':

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8. M. DUNN E. W.'SWANSON

-N N. ELLIOTT R. O. VOSEURGH O

R. E. HAM R. W. WIhKS

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

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

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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 f

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

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y:T; U*h SOF SUCC00 LING LIMIT & INSTRUMENTATION LIMI'TS

.8 THE ESTABLIS'IMEriT AND MAINTENANCE OF A'50F SUBC00 LING LIMIT PRIOR TO TERMI-8307090007 790418 PDR ADOCK 05000289 P

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CARTIN TO DISTRIBUTION PAGE TWO a

MEETIliG HINUTES ON HPI OPERATIOfiAL PROCEDURE APRIL 18, 1979

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U 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

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

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THE 20 MINUTE TIME LIMIT PROVIDEC.IS T.:TET.EM E i WAS ORIGINALLY DEVELOP A 0

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

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

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h Gy 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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.MAY RESULT IN THE HPI'S PUMPING THE SYSTEM SGLID WITH WATER RELIEF OUT THE J

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~ K 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

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' 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.

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

PROVIDED THAT ACTION TO TERMINATE HPI SE TAKEfi ONLY IF A SOLID PRESSURIZER 15 2

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CARTIN TO DISTRIBUTION PACE THREE h

MEETING MINUTES ON HPI OPERATIONAL PROCEDURE

-APRIL 18,1979 25 b.,.-

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

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

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

a-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.

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

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.'n.4 RTD'S MAY NOT INDICATE A SOLID SYSTEM DURING A LOCA).

CONFIRMATION OF THIS M

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POSITI0ri IS THUS INDEPENDENT UPON COMPLETION CF ECCS'S ' REVIEW.

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TABLE 1: REVIEW ITEMS FOR HPI TERMINATION CRITERIA-g 9._

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REASSESS REQUIREMEtiT FOR 50F SUBC00 LING LIMIT (BY APRIL 20TH).

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

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

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PRIORTOHPITERMINATION(BYAPRIL20TH)..

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EVALUATE IMPACT OF OPERATING INSTRUCTION ON ALL ANTICIPATED EVENTS Id

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REFINE PROCEDURE TO INCLUDE SELECTIVE TRIPPING AND/0R THROTTLING OF -

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

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