A02357, Forwards Cycle 5 Refueling Outage Steam Generator Profilometry Insp Results,Per Util .Results Confirm Integrity of Steam Generator Tubes & Supports & Assure Continued Applicability of Design Basis Analyses

Forwards Cycle 5 Refueling Outage Steam Generator Profilometry Insp Results,Per Util .Results Confirm Integrity of Steam Generator Tubes & Supports & Assure Continued Applicability of Design Basis Analyses

ML20054F221
Person / Time
Site:	Millstone
Issue date:	06/02/1982
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
To:	Clark R Office of Nuclear Reactor Regulation
References
A02357, A2357, TAC-47577, TAC-48062, NUDOCS 8206150332
Download: ML20054F221 (27)

Text

a General Offices e Selden Street, Berlin, Connecticut 3 i[EE$n U EI RT CONNECTICUT 06101 T"."l,*.'OT.'"Z"""~' (2m 88 Hen L L J ::':::::CO,"EL" June 2, 1982 Docket No. 50-336 A02357 Director of Nuclear Reactor Regulation Attn: Mr. Robert A. Clark, Chief Operating Reactors Branch #3 U. S. Nuclear Regulatory Commission Washington, D.C. 20555

References:

(1) W. G. Counsil letter to R. A. Clark, dated March 4, 1982.

(2) R. A. Clark letter to W. G. Counsil, dated March 5, 1982 transmitting Amendment No. 73 to Facility Operating License No. DPR-65.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 Steam Generator Profilometry Inspection Results In Reference (1), Northeast Nuclear Energy Company (NNECO) documented its intention to submit the results of the Cycle 5 refueling outage steam generator profilometry inspections within sixty days after startup.

This commitment was acknowledged by the NRC Staff in Reference (2).

Profilometry inspection data and NNECO's evaluation of same are hereby provided in the attachment. Although these data are still being analyzed and are currently considered preliminary, significant revisions to the conclusions presented herein are not anticipated. The results of NNECO's evaluations of the profilometry inspections conducted during the Cycle 5 refueling outage confirm the integrity of the steam generator tubes and supports at Millstone Unit No. 2 and assure the continued applicability of the current design basis analyses.

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l B206150332 820602 PDR ADDCK 05000336 O PDR

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We trust you find the attached information satisfactory.

4 Very truly yours, 1

NORTHEAST NUCLt.AR ENERGY COMPANY W.G.'dounsil

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, Senior Vice President l

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Docket No. 50-336 Attachment Millstone Nuclear Power Station, Unit No. 2 Steam Generator Profilometry Inspection Results - Cycle 5 Refueling ,

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Millstone Unit No. 2 STEAM GENERATOR PROFILOMETRY INSPECTIONS CYCLE 5 REFUELING DECEMBER,1981 Profilometer inspections of about 800 steam generator (SG) tubes were performed at Millstone Unit No. 2 during the December, 1981 refueling outage. Both hot leg and cold leg sides were inspected, as shown in Table 1. Over 7000 eggerate intersections were inspected, and analyzed at 0.050 inch axial increments (a>00,000 3 total elevations), to determine physical dent characteristics, and strain. In addition, over 200 support plate intersections were inspected.

Results of the measurements and analyses as a function of tube support elevation are summarized in Tables 2-11 and plotted in Figures 1, 2, and 3.

The following observations regarding eggerate denting were derived from this information:

1. Dent magnitude and frequency of occurrence were inversely propor-tional to elevation, with average-maximum, diametrical dents at .

the upper elevations equal to about one half the value at the lower elevations. (13 mils for elevations 6-9 versus 25 mils for elevations 1-5).

2. Tube intersections, on the cold leg sides, displayed smaller, less frequent dents, and smaller tensile strains than tube intersections l at the hot leg sides (e.g., in Steam Generator No. 2, 0.3 percent of the cold leg intersections were dented versus 84 percent of l

the hot leg intersections).

3. Tubes at the upper eggerate supports (6-9) displayed fewer dents of significant magnitude (greater than 20 mils diametrical) compared with tubes at the lower eggerates.

The 1980 inspection data, derived from comparable zetec profilometer probes, were reanalyzed using the same format as was used for the 1981 data. Results of the 1980 reanalyzed data are provided in Tables 12-14. Comparison of the 1980 results with 1981 results are plotted in Figures 4, 5, 6, and 7. This comparison shows essentially no increase in frequency or magnitude of dents. A slight increase in average maximum tensile strain was noted, from 1.5 percent in 1980 to 2.4 percent in 1981. It is to be emphasized that the above com-parison between 1980 and 1981 data must be considered with reservations due to the fact that a larger, somewhat different sample population

<as inspected in 1980. A direct comparison between the same inter-sections tested in both outages is being developed, but is not yet available.

Two tubes from the hot leg of Steam Generator No. 2, Line 107-Row 41 and Line 107-Row 43, have been profilometer tested in three consecutive outages. The results of these inspections are given in Table 15. As may be seen, a small progression of denting occurred in the last cycle.

These data continue to confirm the integrity of essential steam generator tubes and supports, and assure the continued applicability of current design basis analyses.

Table 1 SUPNARY OF PROFILOMETER INSPECTIONS OF MP-2 STEAM GENERATOR TUBES DECEMBER 1981 OUTAGE (Zetec 8 Point Probe)

Tube Number Of Steam Support Intersections Generator Side Elevation Inspected 1 HL 1- 9 3615 1 CL I- 9 120 1 HL & CL 1- 9 3735 1 HL 10+11 121 1 CL 10+11 0 1 HL & CL 10+11 121 2 HL I- 9 2283 2 CL I- 9 1322 2 HL & CL 1- 9 3605 2 fL 10+11 25 2 CL 10+11 73 2 HL & CL 10+11 98 1+2 HL & CL 1- 9 7340 1+2 HL & CL 10+11 219 l

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TABLE 2 RELATIONSHIP BETWEEN MAXIMUM DIAMETRICAL REDUCTION AND ELEVATION MILLSTONEUNITNo.2--STEAMGENERATORNo.1(CL)

DECEMBER 1981 OUTAGE No. OF DIAMrTRICAL PEDUCTION (MIL 5) STANDARD  %

AVERAGE (b) MAXIMUM (c) DEVIATION DENTED ELEVATION TESTS No. OF DENTS (a) 1 22 0 -- -- -- 0 2 22 1 5.3 5.3 0 5 0 -- -- -- 0 5 22 20 0 -- -- 0 4

5 18 5 6.3 8.4 1.2 28 0 -- -- -- 0 6 14 2 0 -- -- -- 0 7

0 -- -- -- 0 8 1 9 0 0 --

l 120 6 6.2 8.4 1.1 5 1-9 (a) A dented intersection is defined as an intersection with one or more diametrical dents greater than or equal to 5 mils.

(b) Average of thaximums at elevation.

(c) Single largest valve at elevation.

(

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TABLE 3 RELATIONSHIP BETWEEN AVERAGE ID TENSILE STRAIN AND ELEVATION MILLSTONE UNIT No. 2--STEAM GENERATOR NO. 1 (CL)

DECEMBER 1981 OUTAGE AVERAGE ID MAXIMUM ID PERCENT OF TUBES STAN.

No. OF TENSILE STRAIN TENSILE STRAIN GREATER THAN 1%' STRAIN DEV.

ELEVATION TESTS 1.1 1.2 14 0.06 1 22 22 1.1 1.2 18 0.05 2

1.2 1.5 14 0.21 3 22 1.5 2.0 15 0.39 4 20 1.4 1.9 28 0.27 5 18 2.5 43 0.43 6 14 1.8 2 -- -- 0 7

8 0 --

9 0 --

2.5 20 0.40 1-9 120 1.4 4

TABLE 4 RELATIONSHIP BETWEEN MAXIMUM DIAMETRICAL REDUCTION AND ELEVATION MILLSTONE UNIT No. 2--STEAM GENERATOR No. 1 (HL)

DECEMBER 1981 OUTAGE No. OF DIAMETRICALREDUCTION-(MILS) STANDARD  %

No. OF MAXIMUM (c) DEVIATION DENTED ELEVATION TESTS DENTS (a) _

___ AVERAGE (b) 399 26.9 83.8 18.8 88 1 455 2 499 494 32.9 78.5 15.0 99 526 38.4 83.2 16.3 100 3 526 4 486 478 27.6 74.0 14.8 98 476 464 29.3 85.9 15.4 97 5

443 402 18.6 61.4 11.4 91 6

284 16.6 68.4 12.5 75 7 377 230 96 11.1 57.6 8.6 42 8

17 13.5 53.2 14.1 14 9 123 10 104 102 25.9 ' 63.4 17.1 98 17 15.1 32.8 6.9 100 11 17 3160 27.7 85.9 16.8 87 1-9 3615 24.4 63.4 16.5 98 10+11 121 119 (a) A dented intersection is defined as an intersection with one or more

, diametrical dents greater than or equal to 5 mils.

(b) Average of maximums at elevation.

(c) Single largest value at elevation.

e m. v

Table 5 RELATIONSHIP BETWEEN FRACTION OF MAXIMUM DENTS > 20 MILS (DIAMETRICAL) AND ELEVATION MILLSTONE UNIl No. 2--STEAM GENERATOR No. 1 (HL)

DECEMBER 1981 OUTAGE MAXIMUM DENTS ELEVATION No. OF TESTS ' GREATER THAN'20 MILS ~(1) 1 455 47 2 499 77 3 526 84 4 486 62 5 476 65 6 443 31 7 377 23 8 230 5 9 123 2 10 104 48 11 17 18 l

1-9 3615 52 l

10-11 121 44 4

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TABLE 6 RELATIONSHIP BETWEEN AVERAGE ID TENSILE STRAIN AND ELEVATION MILLSTONE UNIT No. 2 - STEAM GENERATOR No. 1 (HL)

DECEMBER 1981 OUTAGE No. OF AVERAGE ID MAXIMUM ID  % OF TUBES STANDARD ELEVATION TESTS TENSILE STRAIN TENSILE STRAIN >1% STRAIN DEVIATION 1 455 2.7 10.0 78 1.6 2 499 2.9 11.1 89 1.7

,3 526 3.0 11.7 89 1.7 4 486 ,

2.4 10.4 77 1.b 5 476 2.5 13.6 72 1.8 6 443 1.9 7.1 45 0.9 7 377 1.8 7.1 31 0.9 8 230 1.6 4.3 26 0.6 9 123 2.3 13.7 26 2.4 10 104 3.1 14.3 34 2.9 11 17 2.1 4.2 35 1.1 1-9 3615 2.6 13.7 66 1.6 10+11 121 3.0 14.3 34 2.7 4

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TABLE 7 RELATIONSHIP BETWEEN MAXIMUM DIAMETRICAL REDUCTION AND ELEVATION MILLSTONEUNITNo.2--STEAMGENERATORNo.2(CL)

DECMEBER 1981 OUTAGE DIAMETRICAL REDUCTION (MILS) STANDARD  %

No. OF No. OF AVERAGE (b) MAXIMUM (c) DEVIATION DENTED ELEVATION TESTS DENTS (a) _

1 151 0 -- -- -- 0 2 151 1 6.4 6.4 0.0 1 3 150 1 5.6 5.6 0.0 1 4 152 1 16.3 16.3 0.0 1 5 151 0 -- -- -- 0 6 152 0 -- -- -- 0 150 0 -- -- -- 0 7

142 0 -- -- -- 0 8

9 121 1 5.4 5.4 0.0 1 10 59 55 40.9 63.3 13.6 93 14 13 46.8 84.8 19.5 93 11 4 8.4 16.3 4.6 0.3 1-9 1322 68 42.0 84.8 15.1 93 10-11 73 (a) Amore dented intersection is defined as an intersection with one or diametrical dents greater than or equal to 5 mils. ,

4 (b) Average of maximums at elevation.

(c) Single largest value at elevation.

e

TABLE 8 RELATIONSHIP BETWEEN AVERAGE ID TENSILE STRAIN AND ELEVATION MILLST0HE UNIT No. 2--STEAM GENERATOR No. 2 (CL)

DECEMBER 1981 OUTAGE

% OF TUBES STAN.

No. OF AVERAGE ID MAXIMUM ID TENSILE STRAIN GREATER THAN 1 % STRAIN DEV.

ELEVATION TESTS TENSILE STRAIN 1.1 1.2 3 0.1 I 151 151 1.2 1.5 5 0.2 2

1.1 1.4 5 0.1 3 150 1.6 2.5 2 0.7 4 152 1.4 4 0.1 5 151 1.2 1.1 1.3 3 0.1 6 152 2.6 3 0.6 7 150 1.5 3.6 6 0.9 8 142 1.9 2.6 45 0.4 9 121 1.4 1.2 2 0.0 10 59 1.2 21 0.1 11 14 1.8 2.0 0.5 l 19 1322 1.4 3.6 7 0.3 10-11 73 1.7 2.0 5 i

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TABLE 9 RELATIONSHIP BETWEEN MAXIMUM DIAMETRICAL REDUCTION AND ELEVATION MILLSTONE UNIT No. 2--STEAM GENERATOR No. 2 (HL)

DECEMBER 1981 OUTAGE No. OF No. OF DIAMETRICALREDUCTION(MILS) STANDARD  %

ELEVATION TESTS DENTS (a) AVERAGE (b) MAXIMUM (c) DEVIATION DENTED 1 301 297 30.4 89.4 16.5 99 2 299 288 15.2 60.6 10.7 96 3 299 297 25.5 78.5 13.3 99 4 300 284 15.6 67.9 10.3 95 5 296 274 16.2 70.8 12.1 93 6 297 207 9.2 40.4 5.2 70 7 253 205 14.2 51.4 10.1 81 8 152 47 11.1 30.1 6.6 31 9 86 8 5.9 7.2 .7 9 10 24 22 56.8 81.4 13.3 92 11 1 1 19.3 19.3 0 100 1-9 2283 1908 19.4 29.4 13.6 84 10+11 25 23 55.2 81.4 15.1 92 (a) A dented intersection is defined as an intersection with one or more diametrical dents greater than or equal to 5 mils.

(b) Average of neximums at elevation.

(c) Single largest value at elevation.

a .me

TABLE 10 RELATIONSHIP BETWEEN FRACTION OF MAXIMUM DENTS GREATERTHAN20 MILS (DIAMETRICAL)ANDELEVATION MILLSTONE UNIT No. 2 i STEAMGENERATORNo.2(HL)

DEC. 1981 OUTAGE l

MAXIMUM DENTS ELEVATION No.'0F TESTS ' GREATER THAN'20 MILS', 1 1 301 67 2 299 44 3 299 57 4 300 21 5 296 24 6 297 4 7 253 16 8 152 4 9 86 0 1-9 2283 30 s

4

TABLE 11 RELATIONSHIP BETWEEN AVERAGE ID TENSILE STRAIN AND ELEVATION MILLSTONE UNIT No. 2 - STEAM GENERATOR No.2 (HL)

DECEMBER 1981 OUTAGE .

l No. OF AVERAGE ID MAXIMUM ID  % OF TUBES STANDARD ELEVATION TESTS TENSILE STRAIN TENSILE STRAIN > 1% STRAIN DEVIATION 1 301 2.7 10.9 82 1.6 i

2 299 2.3 7.7 75 1.2 3 299 2.7 10.1 72 1.8 4 300 2.1 11.2 41 1.3 5 296 2.2 10.2 40 1.4 6 297 1.74 5.0 26 0.8 7 253 2.2 6.2 25 1.1 8 152 1.6  ?.5 11 0.5 9 86 1.7 3.6 36 0.7 10 24 2.0 3.0 8 1.0 11 1 19.0 19.0 100 0.0 1-9 2283 2.4 11.2 49 1.5 10+11 25 7.7 19.0 12 8.1

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TABLE 12 RELATIONSHIP BETWEEN MAXIMUM DIAMETRICAL REDUCTION AND ELEVATION MILLSTONE UNIT No. 2--STEAM GENERATOR No. 2 (HL) , l AUGUST 1980 OUTAGE I

No. OF DIAMETRICALREDUCTION(MILS) STANDARD  %

No. OF TESTS DENTS (a) ' AVERAGE (b) MAXIMUM (c) ' DEVIATION DENTED ELEVATION __

1 143 139 27.9 56.1 12.0 97 143 130 19.6 57.1 11.9 91 2

143 139 22.7 55.1 11.8 97 3

141 123 16.3 41.7 9.8 87 4

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137 60 10.4 36.6 7.1 44 6

123 78 12.3 46.6 9.2 63 7

3 12.4 23.9 8.2 14 8 21

-- -- 0 9 1 0 --

795 19.3 59.5 12.3 80 1-9 994 (a) A dented intersection is defined as an intersection with one or more diametrical dents greater than or equal to 5 mils.

(b) Average of maximums at elevation.

(c) Single largest valve at elevation.

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TABLE 13 RELATIONSHIP BETWEEN FRACTION OF MAXit10M DENTS >20 MILS (DIAMETRAL) AND ELEVATION f11LLSTONE UNIT NO. 2; STEAM GENERATOR NO. 2 -

AUGUST 1980 OUTAGE -- ZETEC PROFILOMETER MAX. DENTS

..... ELEVAT.10N__ _ . NO. 0F.IESTS. _..._>20 MILS, % .

I 143 70 2 143 35 3 142 50 4 141 30 5 142 27 6 137 6 7 124 10 8 21 5 9 0 0 1-9 994 33 4

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TABLE 14 RELATIONSHIP BETWEEN AVERAGE ID TENSILE STRAIN AND ELEVATION MILLSTONE UNIT No. 2 - STEAM GENERATOR No. 2 (HL)

AUGUST 1980 OUTAGE No. of AVERAGE ID MAXIMUM ID  % OF TUBES ELEVATION TESTS TENSILE STRAIN TENSILE STRAIN > 1% STRAIN 1 143 1.6 2.8 63 2 143 1.6 3.3 42 3 143 1.6 3.3 45 4 141 1.5 3.0 28 5 142 1.3 2.4 28 6 137 1.3 1.6 7 7 123 1.6 2.4 11 8 21 1.1 1.1 5 9 1 -- --

0 1-9 994 1.5 3.3 32 4

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COMPARISON OF THE PERCENT OF INTERSECTIONS

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INSPECTED WITH DIAMETRICAL DENTS l GREATER THAN 20 MILS VERSUS ELEVATION ,

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. MAX DIAMETRICAL DENT, MILS MAX ID BENDING STRAIN %

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