ML19305D215
| ML19305D215 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 02/12/1980 |
| From: | Hirst C WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19305D213 | List: |
| References | |
| NUDOCS 8004140204 | |
| Download: ML19305D215 (10) | |
Text
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i SAFETY EVALUATI0' .
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- LEAKAGE Af0 CRITICAL AREA 1
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- TWEINTEGRIW !
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- CORROSIONRATE
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- OPERATINGINTERVAL ;
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- CONCLUSION
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LEAKAGE AND CRITICAL AREA '
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- DEFINITION OF LEAK l
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NORMAL SHUTDOWN PROCEDURES l
- No SAFEGUARDS ACTUATION
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N MINAL LEAK FLm AREA
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. 3/8INCHDIAMETERHOLE
- . FLm AREA = .110 So, IN. l
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NOMINALLEAKFLm
. 125GFM ;
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e PROFILE OF CORRODED AREAS m PRAIRIE ISLAND 2 R34 C79
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- TSP #2 AREA .060 x .1875 = .011 So, IN.
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TSP #1 AREA .24 x .1875 = .045 So. IN.
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. e LEAK RATE VS. BURST PRESSURE
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TUBE IN~EGRITY .
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GE0 METRY OF
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ELLIPTICAL WASTAGE SPECIMEN
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l BURST PRESSURES FOR THREE HEATS OF 0,875 IN, X 0,050 IN, SPECIMENS :
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HEATB, HEATE, HEATf, !
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50 KSI YIEW 44 KSI YIELD 41 KSI YIELD DEFECTIYPE I
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t 9260 9460 9180 UNDEFECTED 9275 9665 9450 9440 9500 9240 i t
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ELLIPTICALWASTAGE :
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5465
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5550 5635 55 - 60% :
5635 5280 5700 l Rc = 32" .,
LENGE = 1 h
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l 85-90% 2950 -
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2970 ;
Re = 6" i
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REF: MJREG/CR-0277, JULY 1978
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- 12,531-40
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12,000 -
RANGE OF 50 10 58 WALL BURST PRcSSURE . )gg ggggo
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- 40 TO 45% WAL E
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REMAINI -
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O 2% 0 27.' WILL g ,
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6,000 c0
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2.0 2.2
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O.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1. 6 l '. 8
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, RECIPROCAL FLAW LENGTH ( 7 IN I) i
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Figure 5. Room Temperature Burst Pressure of 7/8Tubeswith Machined Flats ,
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(Ref.WCAP-8429) *
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CORROSION RATE ;
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e CNRODENTSOURCE
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RESININTRUSION
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CmDENSATE POLISHERS F
e imEEXPOSURETOCORRODENT
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PbLISHER AVAILABILITY 12//7
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24 ftNTHS OPERATIM .
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e Tme CmROSIm RATE
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INDIVIDUAL LOCATION CmROSIm RATE
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LARGEST ECT INDICATIm IN SERVICE IS 45% ;
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- CALCULATED CmROS!m RATE OF 1.8% / MONTH l t
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OPERATING INTERVAL
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- REQUIREDMINIMUMIUBEWALL
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13 MILS = 26%
- LARGEST ECT INDICATim IN SERVICE I
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E%=55%REMAININGWALL
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- CORROSim RATE 1.8% PER Mmm ,
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PERMISSIBLE OPERATING INTERVAL FOR MINIMUM ILBE WALL i
REMAINING WALL - REQUIRED WALL
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16 Mmms OF OPERATim
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CONCLUSIONS
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- AMQUATE BURST PRESSWE IS lh1NTAINED
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e C@ROSIONRATE1.8%PERMoNTH e &ERATING INTERVAL 16 IMS
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