05000269/LER-1978-013-01, /01T-0:on 780421,primary-to-secondary Leak Indicated.Caused by Leaking Tubes Due to Weld Crack.Five Tubes Plugged.Investigations by Util & B&W Continuing

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/01T-0:on 780421,primary-to-secondary Leak Indicated.Caused by Leaking Tubes Due to Weld Crack.Five Tubes Plugged.Investigations by Util & B&W Continuing
ML19316A371
Person / Time
Site: Oconee  
Issue date: 06/05/1978
From: Ken Wilson
DUKE POWER CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19316A366 List:
References
LER-78-013-01T-01, LER-78-13-1T-1, NUDOCS 7912110636
Download: ML19316A371 (5)
v • d • e


LER-1978-013, /01T-0:on 780421,primary-to-secondary Leak Indicated.Caused by Leaking Tubes Due to Weld Crack.Five Tubes Plugged.Investigations by Util & B&W Continuing
Event date:
Report date:
2691978013R01 - NRC Website
v • d • e

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EVENT OESCRIPVCN ANo PACSA8LE CONsECUENCEs h o 2 1 During normal operations on April 20, RIA 40 alarmed indicating a possible i

,,,3, g primary-to-secondary leak. On April 21, after reaching TS leakage limit, I

m i the unit was shutdown for investigation and repair.

Initial hydro tests weret f a l il I inconc lusive.

Continued investic, tion verified one weld crack. one tube Io is 1 L crack. and two other suspect tubes.

Attar,ts to remove another tube failed. I t o t il i The event did not affect public health and safety.

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CAUSE

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tijojl The leakace ori2inated in one or more of the four olucced tubes (not includ-I titilI inc 'romoved' tube).

Oniv en 69-1 (weld) and 74-2 ( crack) had I

,iir,i verified failures.

All five tubes were plu2ged.

Investigations by Duke and ;

i,,3i l B & W are continuing.

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171-8107 PwCNE:

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_ _ _ _ _ _. _ _ _. _ _ _.. _ _ _ _ _ _ _ _ = _ _ _ _. _ _ _ _ _ _.

SU:L*fARY OF MAJOR OTSC TUBE EXPERIENCE AT OCONEE LANE

  1. TUBESEXAMINdD CENERATOR ROW TUBE ELEVATION DATE TUBE LEAKER CONDITION ACTION ROP (excludes leakers) 1-A 77 17 UTS 10/31/76 Yes No Crack Plugged RO-269/76-17 15 1

1-A 77 18 LTrS 10/31/76 Yes No Distorted Eddy Plugged Current Signal

'l-B 114 109 14tli Plate 12/8/76 No Yes No Visual Nailed R0-269/76-19 139 Inspection 1-h 113 115 14tli Plate 12/8/76 No No Distorted Eddy Plugged y

Current Signal 1-n 113 110 14tli Plate 12/8/76 No No Similar to Nailed 114/109 l-B 75 18 UTS.

12/8/76 Yes No 300 Crack Nailed 1-B 75 12 UTS 1/15/77 Yes Yes 350 Crack Nailed RO-269/77-2 140 1-B 81 128 trrs 1/15/77 No No Eddy Current Nailed Indication i

l-B 32 13 14tli Plate 2/28/77 No Yes Eddy Current Nalled R0-269/77-8 3%

Indication 1-B 33 14 14tli Plate 2/28/77 No No Eddy Current Nailed j

Indication 1-B 77 25 14tli Plate 2/28/77 Yes No Eddy Current Removed Indication l-B 2

7 13th Plate 2/28/77 No No Eddy Current Plugged Indication 1-B 2

8 13tli Plate 2/28/77 No No Eddy Current Plugged Indication page 1

SUttfARY OF !!MOR OTSG TUBE EXPERIENCE AT OCONEE LANE

  1. TUBES EXAMINED GENERATOR ROU TUBE ELEVATION DATE TUBE LEAKER CONDITION ACTION R08 (excludes leakers) 1-B 101 40 4th Plate 2/28/77 No No Eddy Current Plugged Indication 1-B 77 25 UrS 3/22/77 Yes Yes Weld Crack Replugged R0-269/77-Il 100 1-B 77 3,5,8 3/22/77 Yes No Distorted Plugged Eddy Current Signal 1-B 77 15 UTS 5/7/77 Yes Yes Crack Plugged R0-269/77-16 507 i !

l-B 77 18 5/7/77 Yes No Removed 1

1-B 17 5

5/7/77 No No Distorted Plugged Eddy Current Signal 2-B 77 23 Urs 12/4/76 Yes Yes 270 Crack, Removed R0-270/76-15 133 IIole 2-B 77 27 15th Plate 12/4/76 Yes No Wear Appearance Removed 2-B 124 42 12th Plate 12/4/76 No No Eddy Current Plugged Indication, 40-60%

4 2-B 118 52 12th Plate 12/4/76 No No Similar to Left 124/42, 15%

3-B 77 11 15th Plate 7/21/76 Yes Yes No Visual Plugged R0-287/76-10 9

i Inspection j

3-B 77 19 15th Plate 2/14/77 Yes Yes EdgyCurrent Nailed R0-287/77-2 142 45 Crack j

l 9

page

SUt!!!ARY OF ?!AJOR OTSG TUBE EXPERIENCE AT OCONEE LANE

  1. TULLES EXANINE CENERATOR ROW TUBE ELEVATION DATE TUBE LEAKER CONDITION ACTION RO#

(excludes leaker 4

3-H 77 12,13,14,15 2/14/77 Yes No Eddy Current Nailed 16,17,18,20, 21 3-H 75 2

2/14/77 Yes No Eddy Current Nailed 3-H 78 1

15th Plate 6/10/77 No Yes 90 Crack & 1/8" Nailed R0-287/77-8 133 longitudinal

,' /,

3-B 77 2

UTS 7/14/77 Yes Yes 60 -90 Crack Nailed R0-287/77-10 120 3-B 77 1

7/14/77 Yes No Nailed 2-B 77 25 IITS 1/14/78 Yes Yes 90 Crack Nailed R0-270/77-12 2-B 75 21 1/14/78 Yes No Eddy Current Plugged ludication, SOAK 2-H 77 4

1/14/78 Yes No Eddy Current Plugged Indication, SOAK 2-B 77 18 1/14/78 Yes No Eddy Current Plugged Indication, SOAK 2-H 77 19 1/14/78 Yes No Eddy Current Plugged Indication, SOAK i

l 2-B 77 21 1/14/78 Yes No Eddy Current Plugged i

Indication, SOAK 2-B 78 4

1/14/78 Yes No Eddy Current Plugged Indication, SOAK r

page 3

k SUtlMARY Ol' MAJOR OTSG TUBE EXPERIENCE AT Ot.JNEE LANE

  1. TUBES EXAttlNF GENEllATOR ROW TUBE ELEVATION DATE Tulle LEAKER CONillTION ACTION RO#

(excludes leaker' l - 11 69 1

LTS 4/21/78 No Yes Weld Leak Plugged R0-269/78-13 478 Rewelded 1-11 70 1

4/21/78 No No Visibly leaking Plugged (possibly) 1 - 14 59 1

4/21/78 No Yes Visibly leaking Pluggeel (possibly) 1 - 11 74 2

UTS 4/21/78 No Yes 45-90 Crack Plugged 1 - 11 77 27 4/21/78 Yes No Removal Attempt Nailed UTS - Ilpper tubesheet LTS - Lower tubesheet SOAK "Second-of-a-kind" instrumentation page 4

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