ML20136C697
| 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) | |
Text
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COPY MADE ON OF DOCUME!C PROYIDED BY METROPOLITAN, EDISON COMPANY.i Supervisor, Docu:nent control, NRC D
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TiMN5MITTAL To: ATTENTION: KEN SCHROEDER - B&W, Telecopy No. ('717) 944-4756 G
L'. ROCERS TRANSHITTAL ! M[
ALSO TELECOPY TO: 9 R. WILSON TRANSMITTAL / c A.) f '7 6 i Br,W TRAILER 26 TRANSMITTAL /
Q g,77 TIME 4:30 PM - DATE APRIL ll, 1979 -
SUBJECT ALLI(ANCE RESEARCH, CENTER REY 0kT 46'89 -
PRESSURIZER REFENNCE LEG EFFERVESCENCE TEST
, APPROVED BY f m/ 'B&W ACTION /
OPERATION MANAGER (/ -
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 -'
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BLOWDOWN." THE UTILITY IN THIS CASE REQUIRED THE INSTALLATION OF A SENSE LI
( . 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 l REQUIRED WITHOUT THE INSTALLATION OF SENSE LINE ISOLATORS.
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