ML20136C697

Forwards Three Pages from Alliance Research Center Rept 4689 Re Pressurizer Ref Leg Effervescence Test.Work Initiated in 1976 to Provide Info for Prediction of Pressurizer Level Indication Error During LOCA

ML20136C697
Person / Time
Site:	Crane
Issue date:	04/11/1979
From:	Fairbrother D METROPOLITAN EDISON CO.
To:	Schroeder K BABCOCK & WILCOX CO.
References
TM-0946, TM-946, NUDOCS 7910010524
Download: ML20136C697 (4)

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ATTENTION:

KEN SCHROEDER - B&W, Telecopy No. ('717) 944-4756 G

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- DATE APRIL ll, 1979 SUBJECT ALLI(ANCE RESEARCH, CENTER REY 0kT 46'89 PRESSURIZER REFENNCE LEG EFFERVESCENCE TEST

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OPERATION MANAGER

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PER YOUR REQUEST ATTACHED ARE PORTIONS OF THE ARC REPORT. 'nlIS WORK WAS INITIATED IN 1976 AT THE REQUEST OF NPGD TO PROVIDE DATA NEEDED FOR THE PREDICTION

.. _ 0F PRESSURIZIR LEVEL INDICATION ERROR.DURING A LOSS-0F-COOLANT ACCIDENT (LOCA),..

THE ARC TEST WERE PERFORMED TO DETERMINE IF AN ERROR COULD OCCUR DUE TO EFFER-2 VESCING OF HYDROGEN IN THE REFERENCE LEG (SENSE LINE) AND A RESULTING EXPULSION

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OF WATER FROM THE REFERENCE LEG DURING DEPRESSURIZATION.

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' CONCERN RE.GARDING'.'THI'S fHEN0MENON DEVELOP 55 AFTER IT WAS REPORTED THAT 1

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' WATER WERE LOST FROM A REFERENCE LEG ON A COMPETITOR'S SYSTEM OURING A NON LOCA BLOWDOWN." THE UTILITY IN THIS CASE REQUIRED THE INSTALLATION OF A SENSE L

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LATOR (BELLOWS SEAL) AND THE INCIDENT PRODUCED NRC QUESTIONS REGARDItiG THE IMPACT l

l 0F REFERENCE LEG BEHAVIOR DURING A BLOWDOWN TRANSIENT."

. THE ARC. TESTS, WHICH WERE, DESIGNED TO PROVIDE CONSERVATIVE-RESULTS, HAVE SHOWN THAT THERE IS NO MEASURABLE LOSS OF WATER FROM THE REFERENCE' LEG DURING A 10 SECOND TRANSIENT FROM 2300 PSI TO 1400 PSI (SIMULATED LOCA) WITH HYDROGEN SATURATED REFERENCE LEG WATER. ON CONTINUATION OF THE TRANSIENT FROM 1400 PSI TO ATMOSPHERIC PRESSURE, SIGNIFICANT LOSS OF WATER OCCURS ONLY AFTER THE PRESSURE Hd5 DECAYED BELOW 400 PSI.

1 BASED ON THESE TESTS, IT WAS CONCLUDED THAT THE REFERENCE LEG WILL PERFORM AS REQUIRED WITHOUT THE INSTALLATION OF SENSE LINE ISOLATORS.

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