ML19305D215

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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: ML19305D215 ML19305D218
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

• OPERATINGINTERVAL  ;

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• CONCLUSION

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LEAKAGE AND CRITICAL AREA '

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• DEFINITION OF LEAK l l

NORMAL SHUTDOWN PROCEDURES l

- No SAFEGUARDS ACTUATION N MINAL LEAK FLm AREA

. 3/8INCHDIAMETERHOLE

- . FLm AREA = .110 So, IN. l NOMINALLEAKFLm

. 125GFM  ;

I e PROFILE OF CORRODED AREAS m PRAIRIE ISLAND 2 R34 C79

- TSP #2 AREA .060 x .1875 = .011 So, IN.

TSP #1 AREA .24 x .1875 = .045 So. IN.

. e LEAK RATE VS. BURST PRESSURE e

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TUBE IN~EGRITY .

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• TWE WAu. REQUIRED l 1

NORMAL . M j i

FAULTED . 0 13 i

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e TUBEBURSTDATA l,

r CORROSIONPROFILES  !

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GE0 METRY OF ELLIPTICAL WASTAGE SPECIMEN m

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l BURST PRESSURES FOR THREE HEATS OF 0,875 IN, X 0,050 IN, SPECIMENS  :

P t

HEATB, HEATE, HEATf,  !

50 KSI YIEW 44 KSI YIELD 41 KSI YIELD DEFECTIYPE I t

9260 9460 9180 UNDEFECTED 9275 9665 9450 9440 9500 9240 i t

i ELLIPTICALWASTAGE  :

-  ;

5465 5550 5635 55 - 60%  :

5635 5280 5700 l Rc = 32" .,

LENGE = 1 h

l 85-90% 2950 -

2970  ;

Re = 6" i

REF: MJREG/CR-0277, JULY 1978 l

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t 12,531-40 l

14, 00 8 - imiform Thinning i

12,000 -

RANGE OF 50 10 58 WALL BURST PRcSSURE . )gg ggggo

- un e cded gj 10,000 -

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1. 40 TO 45% WAL E

- 8,000 -

REMAINI -

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m O 2% 0 27.' WILL g ,

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/ 10 TO 15% WALL REMAINI /p  :

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i (THROUGHWALL

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/ ExectistnritcuRvcI l 1  :

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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 Figure 5. Room Temperature Burst Pressure of 7/8Tubeswith Machined Flats ,

(Ref.WCAP-8429) *

- _ _ _ _ _ _ _ _ - _ _ _ _ . - _ _ _ _ _ _ .____l._

CORROSION RATE  ;

e CNRODENTSOURCE RESININTRUSION CmDENSATE POLISHERS F

e imEEXPOSURETOCORRODENT PbLISHER AVAILABILITY 12//7 24 ftNTHS OPERATIM .

e Tme CmROSIm RATE INDIVIDUAL LOCATION CmROSIm RATE 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

• REQUIREDMINIMUMIUBEWALL 13 MILS = 26%

• LARGEST ECT INDICATim IN SERVICE I

E%=55%REMAININGWALL 4

• CORROSim RATE 1.8% PER Mmm ,

PERMISSIBLE OPERATING INTERVAL FOR MINIMUM ILBE WALL i

REMAINING WALL - REQUIRED WALL

=

16 Mmms OF OPERATim

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CONCLUSIONS

• AMQUATE BURST PRESSWE IS lh1NTAINED e C@ROSIONRATE1.8%PERMoNTH e &ERATING INTERVAL 16 IMS

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