ML19290A089
| ML19290A089 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/08/1979 |
| From: | Smotre J BABCOCK & WILCOX CO. |
| To: | BABCOCK & WILCOX CO. |
| References | |
| TM-0943, TM-943, NUDOCS 7910010480 | |
| Download: ML19290A089 (2) | |
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7 TMI DOCUMENTS Y
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' BA8C0CK & WILC0X COMPANY ER GENERATION GROUP
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o.l ENGINEERING OPERATIONS MANAGER
- E.A. WOMACK From os $63.:
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Date 2:00 PM Subj.
RC PRESSURE INDICATIONS AND ERROR ADJUSTMENTS
' APRIL 8,1979
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THE FOLLOWiNG WILL CLARIFY APPROPRIATE PRESSURE INDICATIONS, INSTRUMENT STRING ERRORS (INCLUDING RADIATION EFFECTS) AND READA3ILITY ERRORS TO BE USED WHEN IMPLEMENTING B&W AND IMI-2 OPERATING EMERGENCY PROCEDURE REFERENCING RC PRESSURE. THE PRESSURE.' SIGNAL WHICH SHOULD BE USED IN CONJUNCTION W'ITH RC '
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PRESSURE LIMITATIONS IS ONE FROM A HOT LEG PRESSURE SENSOR IN THE LOOP WITH THE RUNNING RC PUMP.
IF THIS SIGNAL IS READ FROM THE COMPUTER, ONLY_THE
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h' INSTRUMENT ERROR NEEDS TO BE CONSIDERED. HOWEVER, IF THE PRESSURE INDICATION IS
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I M DIRECTLY IN THE CONTROL ROOM, BOTH THE INSTRUMEN'T ERROR AND THE READABILITY ERROR SHOULD BE APPLIED. ALL B&W PROCEDURES ARE CURRENLTY BEING REVIEWED TO ENSURE THEY WILL CLEARLY REFLECT THIS PHILOSOPHY WITH RESP.ECT TO RC PRESSURE SIGNALS AND ASSOCIATED ERROR.
INSTRUMENT STRING READABILITY
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ERROR ERROR TOTAL WIDE RANGE PRESSURE INDICATOR (0-2500 PSI) i 100 PSI i 50 PSI i 150 ?
NARROW RANGE PRESSURE INDICATOR (0-500 PSI)*-LOOP A ONLY i 20 PSI i 10 PSI i 30 ?
- THIS SIGNAL IS NOT AVAILABLE FROM THE COMPUTOR.
B&W HAS PERFORMED CALCUIATIONS WHICH SHOW A LOOP A PRESSURE TAP TO LOOP B PRESSURE TAP LOCATION PRESSURE DIFFERENCE OF 14.PS,I (LOOP B HIGHER THAN LOOP A)
Q W1TH ONt RC PUMP RUNNING 1N t00P A.
IN vrEW OF THE POSSIBtt PRESSURE S1CNit.AnD 2'221 195
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- SUBJECI: RC PRESSURE INDICATIONS AND ERROR ADJUSTMENTS PAGE #2 APRIL 8,1979 READABILITY ERRORS ASSOCIATED WITH THIS INSTRUMENTATION, IT IS QUITE-l REASONABLE TO EXPECY INSTANTANEOUS PRESSLTC DIFFERENCES FROM SE'1 SORS IN
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i t LOOP A AND LOOP B 0F 50 PSI AS WAS.REPORIED EARLIER FROM THE SITE.
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JRS:mue cc: D.H. ROY LONG TERM COCLIliG TEAM A
CONTROL AND INSTRUMENTATION TEAM PUMPS FLUID SYSTEMS FUEL / CORE SERVICE MANAGER LICENSING MANAGER CONTROL ANALYSIS PROCEDURE COORDINATION PROCEDURE REVIEW HEAVY COMPONEhTS
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