ML20071D719

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Forwards Calvert Cliffs Unit 1 Eddy Current Insp of Steam Generators 11 & 12 & Calvert Cliffs Units 2 Eddy Current Insp of Steam Generators 21 & 22, Per Tech Spec 4.4.5.5. Insp Results Discussed.List of Tubes Examined Encl
ML20071D719
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 02/25/1983
From: Lundvall A
BALTIMORE GAS & ELECTRIC CO.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20071D724 List:
References
NUDOCS 8303110308
Download: ML20071D719 (6)
v • d • e


Text

.

I BALTIMORE GAS AND ELECTRIC CHARLES CENTER P.O. BOX 1475. BALTIMORE, MARYLAND 21203 ARTHUR E. LUNDVALL. JR.

February 25,1983 Vict PRESIDENT SUPPLY U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:

Mr. Ronald C. Haynes, Director

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 1982 Results of Steam Generator Eddy Current Examinations

REFERENCES:

(a)

Technical Specification 4.4.5.5 Calvert Cliffs Unit 1; Docket No.

50-317 (b)

Technical Specification 4.4.5.5 Calvert Cliffs Unit 2; Docket No.

50-318 ENCLOSURES: (1)

Calvert Cliffs Unit 1 Eddy Current inspection of Steam Generators

  1. 11 & 12 Final Report, Prepared by Zetec, Inc., May 1982 (2)

Calvert Cliffs Unit 2 Eddy Current inspection of Steam Generators

  1. 21 & 22 Final Report, Prepared by Zetec, Inc., November 1982 (3)

Combustion Engineering Series 67 Steam Generator Tube Sheet Pattern (4)

Tubes Plugged #11 Steam Generator (5)

Tubes Plugged #12 Steam Generator Gentlemen:

i References (a) and (b) require that we report, on an annual basis, all steam generator tube examinations conducted in the past year, listing the tubes examined, degradation noted, and identity of tubes plugged.

i Calvert Cliffs Steam Generators are Series 67 Combustion Engineering Units and tube I

locations are referenced to the hot leg or cold leg tube sheet as shown in Enclosure (3).

The hot leg tube sheet is divided into quadrants #2 (right) and #3 (lef t) with Line No. I down the center. Whereas the cold leg tube sheet is divided into quadrants #1 (lef t) and

  1. 4 (right) with Line No. I down the center. All steam generators at Calvert Cliffs Unit Nos.1 & 2 were examined by the eddy current method during 1982. Examinations were conducted in accordance with the requirements specified in references (a) and (b), and 8303'110308 830225

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Mr. Ronald C. Haynes February 25,1983 Page 2 Regulatory Guide 1.83.

Enclosures (1) and (2) list the tubes examined and the interpretations of the indications found.

During the spring 1982 Unit 1 outage, both steam generators #11 and 12 were examined.

Tubes were probed from the cold leg side of the steam generators with full length tube

- exams being performed. No service induced degraded tubes as defined by the Technical Specifications ( 220%) were found during this inspection. Several tubes, however, were found to be damaged as a result of steam generator preventive maintenance modifications.

Eddy current results of steam generator #11 revealed that of the 886 tubes examined, l

two (2) tubes were damaged and 146 contained service induc'ed tube denting. In 128 of j

the 146 dented tubes, the denting occured at the ninth support on the hot leg side of the tube bundle. Of the 886 total tubes examined,549 were selected from the region where the ninth support exists. The average dent size of the tubes tested in the ninth support of #11 steam generator was 0.370 mils. All the dented tubes allowed passage of the eddy current probe.

Eddy current results of steam generator #12 revealed that of the 1,038 tubes examined one (1) tube was damaged and 136 contained service induced denting. In 129 of the 136 dented tubes, the denting occured at the ninth support on the hot leg side of the tube i

bundle. Of the 1,038 total tubes examined in #12 steam genrator, 556 were selected from the region where the ninth support exists. The average dent size of the tubes tested in the ninth support of #12 steam generator was 0.43 mils. All the dented tubes allowed passage of the eddy current probe.

A total of fifteen (15) tubes were plugged in #11 Steam Generator and eleven (11)in #12 Steam Generator. All tubes were plugged as a result of a preventative maintenance modification which reduces the possibility of 'a Number 9 or Number 10 support plate cracking occurrence. This modification cuts and trims these plates from the baffle wall of the ste m generator. Due to denting, high stresses could build-up in the plates if they rei 9 locked to the baffle wall. The cutting and trimming performed will prevent high stress points by allowing the plate to expand more evenly should denting progress. In order to secure the plates adequately after detachment from the baffle wall, selected tubes were then expanded into the support plate with sleeves. These tubes were then j

removed from service by plugging. Additionally, three tubes were damaged during the cutting of the plate and plate attachment lugs. These tubes were also removed from service by plugging. A list of the tubes plugged are provided as Enclosures (4) and (5).

During the fall 1982 Unit 2 outage both steam generators #21 and 22 were examined.

Tubes were probed from the hot leg side of the steam generator with full length tube i

examinations performed. Service induced degradation was found in both #21 and #22 i

steam generators. The imperfections found were all of a small volume and small area nature. A small pit on the OD of the tube would produce this type of indication. The flaws were not localized in a particular area of the tube bundle.

Mr. Ronald C. Haynes i

February 25,1983 Page 3 i

Eddy current results of steam generator #21 showed that of the 832 tubes examined one (1) was defective (imperfection 2 40%), five (5) were degraded (.? 20%), nine (9) had imperfections 4 20% wall thickness, and 29 tubes contained service induced denting.

Eighteen of the 29 tubes dented contained dents in the area of the ninth support of the hot leg side of the tube bundle. Of the total 832 tubes examined in #21 steam generator 529 were selected from the region where the ninth support exists. The average dent size of the tubes tested in the ninth support of #21 steam generator was 0.110 mils. All the dented tubes allowed passage of the eddy current probe.

Eddy current results of steam generator #22 revealed that of the 815 tubes examined one (1) was defective ( 2 40%), two (2) were degraded ( 2.

20%), 11 contained I

imperfections 4. 20% wall thickness, and 101 tubes contained service induced denting.

Of the 101 dented tubes,47 had denting in the area of the ninth support of the hot leg side of the tube bundle. Of the total 815 tubes examined in #22 steam generator 529 were selected from the region where the ninth support exists. The average dent size of the tubes tested in the ninth support of #22 steam generator was 0.143 mils. All the dented tubes allowed passage of the eddy current probe.

As stated above, one (1) tube in each of Unit 2's two (2) steam generators contained defects which exceeded the plugging limit of 40% loss of nominal wall thickness. These tubes were removed from service by plugging each end with mechanical tube plugs. The tube numbers are Line 15 Row 136 Quandrant #3 in Steam Generator #21, and Line 46 Row 29 Quandrant #2 in Steam Generator #22. They show tube wall loss of 44% and

$9%, repectively. Records show that these tubes had not been inspected by eddy current techniques in the area of the flaws prior to this inspection. Both flaws were small volume, small area flaws. The flaws were not located in the sludge area of the steam generators, nor were they in the area of a tube support.

Should you have further questions regarding this matter, please do not hesitate to contact us.

Very truly yours, g Vice President - Supply cc:

3. A. Biddison, Esquire G. F. Trowbridge, Esquire D. H. Jaffe, NRC R. E. Architzel, NRC 4

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ENCLOSURE (4)

TUBES PLUGGED IN CALVERT CLIFFS UNIT 1 STEAM GENERATOR NUMBER 11 LINE NO.

ROW NO.

QUADRANT HL OR CL DATE PLUGGED 62 95 4

CL 06/11/82 3

HL 06/10/82 23 136 4

CL 06/11/82 3

HL 06/10/82 53 104 4

CL 06/11/82 3

HL 06/10/82 37 120 4

CL 06/11/82 3

HL 06/10/82 19 134 4

CL 06/11/82 3

HL 06/10/82 19 104 4

CL 06/11/82 3

HL 06/10/82 1

120 0

CL 06/11/82 0

HL 06/10/82 19 134 1

CL 06/11/82 2

HL 06/10/82 19 104 1

CL 06/11/82 2

HL 06/10/82 37 120 1

CL 06/11/82 2

HL 06/10/82 53 104 1

CL 06/11/82 2

HL 06/10/82 20 137 4

CL 06/15/82 3

HL 06/15/82 21 136 4

CL 06/15/82 3

HL 06/15/82 22 135 4

CL 06/15/82 3

HL 06/15/82 24 135 4

CL 06/15/82 3

HL 06/15/82

e 9

4E O

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ENCLOSURE (51 i

TUBES PLUGGED IN CALVERT CLIFFS UNIT 1 STEAM GENERATOR NO.12 LINE NO.

ROW NO.

QUADRANT HL OR CL DATE PLUGGED 64 91 4

CL 06/14/82 3

HL 06/14/82 51 104 4

CL 06/14/82 3

HL 06/14/82 35 120 4

CL 06/14/82 3

HL 06/14/82 17 134 4

CL 06/14/82 3

HL 06/14/82 17 104 4

CL 06/14/82 3

HL 06/14/82 3

120 1

CL 06/14/82 2

HL 06/14/82 21 134 1

CL 06/14/82 2

HL 06/14/82 21 104 1

CL 06/14/82 2

HL 06/14/82 39 120 1

CL 06/14/82 2

HL 06/14/82 55 104 1

CL 06/14/82 2

HL 06/14/82 3

120 4

CL 06/14/82 3

HL 06/14/82

_

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