ML19290A088

Clarifies Appropriate Pressure Indications,Instrument String Errors Which Include Radiation Effects & Readability Errors to Be Used When Implementing B&W & TMI-2 Operating Emergency Procedure Referencing Reactor Coolant Pressure

ML19290A088
Person / Time
Site:	Crane
Issue date:	04/09/1979
From:	Smotre J BABCOCK & WILCOX CO.
To:	Womack E BABCOCK & WILCOX CO.
References
TM-0957, TM-957, NUDOCS 7910010478
Download: ML19290A088 (3)

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RC PRESSURE INDICATIONS AND ERROR ADJUSTMENTS

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.ad THE FOLLOWING WILL CLARIFY APPROPRIATE PRESSURE INDICATIONS, INSTRUMENT STRING ERRORS (INCLUDING RADIATION EFFECTS) AND READABILITY ERRORS TO BE USED WHEN IMPLEMENTING B&W AND TMI-2 OPERATING EMERGENCY PROCEDURE REFERENCING RC PRESSURE. THE PRESSURE. SIGNAL WHICH SHOULD BE USED IN CONJUNCTION WITH RC '

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PRESSURE LIMITATIONS IS ONE FROM A HOT LEG PRESSURE SENSOR IN THE LOOP WITH THE RL'NNING RC PUMP. IF THIS SIGNAL IS READ FROM THE COMPUTER, ONLY THE

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INSTRUMENT ERROR NEEDS TO BE CONSIDERED. HOWEVER, IF THE PRESSURE INDICATION IS READ DIRECTLY IN THE CONTROL ROOM, BOTH THE INSTRUMENT ERROR AND THE READABILIIY ERROR SHOULD BE APPLIED. ALL B&W PROCEDURES ARE CURRENLTY BEING REVIEkT.D TO ENSURE THEY WILL CLEAFl.Y REFLECT THIS PHILOSOPHY WITH RESPECT TO RC PRESSURE SIGNALS AND ASSOCIATED EP20R.

INSTRUMENT STRING READABILITY ERROR ERROR TOTAL WIDE RANGE PRESSURE INDICATOR (0-2500 PSI) i 100 PSI i 50 PSI i 150 PS NARROW RANGE PRESSURE INDICATOR (0-500 PSI)*-LOOP A ONLY i 20 PSI i 10 PSI 1 30 ?S

• THIS SIGNAL IS NOT AVAILABLE FROM THE COMPUTOR.

B&W HAS PERFORMED CALCULATIONS WHICH SHOW A LOOP A PRESSURE TAP TO LOOP B PRF.SSURE TAP LOCATION PRESSURE DIFFERENCE OF 14 PSI (LOOP B HIG. R THAN LOOP A)

WITH ONE RC PUMP RUNNING IN LOOP A.

IN VIEW OF THE POSSIBLE PRESSURE SIGNAL AND o

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J.R. SMOTREL TO E. A. WO}L1CK

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SUBJECT:

RC PRESSURE INDICATIONS AND ERROR ADJUSTMENTS PAGE #2 APRIL 8,1979 l _

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READABILITY ERRORS ASSOCIATED WITH THIS INSTRUMENTATION, IT IS QUITE-i

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REASONABLE TO EXPECT INSTANTANEOUS PRESSURE DIFFERENCES FROM SE'ISORS IN LOOP A AND LOOP B 0F 50 PSI AS WAS REPORTED EARLIER FROM THE SITE.

JRS:mue cc: D.H. ROY LONG TERM COOLING TEAM A

CONTROL AND INSTRUMENTATION TEAM p

PUMPS FLUID SYSTEMS FUEL / CORE SERVICE MANAGER LICENSING MANAGER CONTROL ANALYSIS PROCEDURE COORDINATION PROCEDURE REVIEW HEAVY COMPONENTS 1

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