ML20084C346

Steam Generator Tube Inservice Insp Rept,Sequoyah Unit 2 Cycle 1 Refueling Outage

ML20084C346
Person / Time
Site:	Sequoyah
Issue date:	07/31/1983
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20084C342	List: ML20084C341 ML20084C346
References
NUDOCS 8404270219
Download: ML20084C346 (3)

Text

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1 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT SEQUOYAH NUCLEAR PLANT UNIT 2 CYCLE 1 REFUELING OUTAGE July 1983

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PDR ADOCK 05000328.

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- L CONTENTS Table I - Inspection Summary Steam Generators Nos. 2 and 3-Table II - Dent Analysis Summary Steam Generator No. 2 Table III - Dent Analysis Summary Steam Generator No. 3.

Table IV - Identification of Tubes Plugged

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TABLE I

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INSPECTION

SUMMARY

SEOUOYAll ~ UNIT.#2 ..

Steam Genera tors # 2 a - # 3 -

S/G #2 - S/G #3

'1983 ilOT ' COLD- HOT COLD TOTALS LEG LEG LEG a LEG Tubes 4In-Steam. Generator

- (Straight' Lengths) 13,552 3,388 3,388 3,388' 3,388 TubessInspected .

1,289 397 33 462 397

' ' Tubes-Recording.. Severe ~ Damage.

,  ; (Approximate :Wa11 Loss '4 0%. & Greater) 1 0' 0 0 1 (R2-C94)

Tubes . Recording Moderate Damage-

, (Approximate Wall Loss 20% to 39%) 0 0~ 0 0 0 l Tubes Recording ' Minor.' Damage-(Approximate' Wall' Loss Less Than120%) 0 0 0 0 0

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TABLE II

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DENT ANALYSIS

SUMMARY

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Sequoyah Unit #2 Steam Generator #2 1983 Hot Cold Total Leo Le6

~ Tubes In Steam Generator

(Straight Lengths) 6776 3388 3388 -

Total Tubes Analyzed

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383 241 142 ~

Total Intersections Analyzed 2034 1686 348 Dents 20+ Mils No. of Intersections 0 0 0 Dents 16-20 Mils No. of Intersections 0 0 0 Dents 11-15 Mils No.lof Intersections 0 0 0 ,

Intersections Recording. Initiation of Dents or Magnetite -

Buildup . .

No. of Intersections- .126 124. 2 6.2% '7.4% 0.6%

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' Intersections Recording' No Dents Nor

. MOgnetite Buildup .No. of Intersections' 1908 '1562 346 93.8%. 92.,6% 9 ,9 ~4 %

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TABLE III DENT ANALYSIS

SUMMARY

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Sequoyah Unit #2 Steam Generator #3 1983 Hot Cold Total Leo Leo Tubes In Steam Generator (Straight Lengths) 6776 3388 3388 -

Total Tubes Analyzed (Straight Lengths) 601 472 129 -

Total Intersections Analyzed 2766 2383 383

Dents 20+ Mils No. of Intersections 0 0 O Dents 16-20 Mils No. of Intersections 0 0 0 Dents'11-15 Mils No. of Intersections 0- 0- 0 Intersections Recording Initiation of ' Dents or Magnetite -'

uildup.

No..of Intersections 131 111 20 4.7% 4.7% 5.2%.

Intersections Recording No Dents Nor-Magnetite Buildup No.'of Intersections 2635 '2272 363 95.3% -95.3% 94.8%,

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TABLE IV SEQUOYAH UNIT 2 IDENTIFICATION OF TUBES PLUGGED S/G No. Tube Plug Location Reason 3 R2-C94 Loose part damage re-sulting in primary-to-secondary leak

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