ML20099E879

Forwards Response to NRC 920710 Request for Addl Info Re Pressurizer Surge Line leak-before-break Analysis. Pressurizer Surge Line Contains Only One Shielded Metal Arc Weld at Node Point 1100

ML20099E879
Person / Time
Site:	Comanche Peak
Issue date:	08/07/1992
From:	William Cahill, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M82947, TXX-92350, NUDOCS 9208120001
Download: ML20099E879 (7)

Text

.

6 gang Log

1. TXX-92350

=

File # 903.6 Ref.

1. llVREG 1061

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=

TUELECTRIC wim.m J. c.hiu, Jr.

August 7, 1992 Grtwp vier trest.tene V. S. Nuclear Pegulatory Commission Attn:

Document Control Desk Washington, DC 20555

SUBJECT:

COMAf1CHE PEAK STEAM ELECTRIC STAT 10f1 (CPSES) - UNIT 2 DOCKET NO. 50 446 PRES 50RIZER SURGE LINE LEAK-BEFORE-BREAK AtlALYSIS REF:

flRC letter dated July 10, 1992, to William J. Cahill, Jr.,

" Request for Additional Information Comanche Peak Steam Electric Station Unit 2, Pressurizer Surge Line Leak-Before-Break Analysis (TAC No. M82947)"

Gentlemen; In response to your request for additional information referenced above, we are providing responses to your request in Attachment 1.

To assure clarity, each request is repeated and then responded to in the attachment.

If there are any questions, please call Mr. Chris E. Jensen at (214) 812-8820.

9 Sincerely, William J. Cahill, Jr.

By:

bOM O. R, Woodlan Docket Licensing Manager CEJ/tg Attachment c' - Mr. J. L. Milhoan, Region IV Mr. B, E. Holian, 11RR Resident ' inspectors, CPSES (2) 920812c001 920807

{DR ADOCK'05000446 PDR 400 N, Olive Street LB. 81 Dattas,Tctas 752o1

. to TXX-92350 Page 1 of 6 RESPONSES TO HRC "RE0 VEST FOR ADDITIONAL INFORMATION -

CPSES, UNIT 2 PRESSVRIZER SURGE L'NE LEAK-BEFORE-BREAK ANALYSIS." NRC LETTER OF '9LY 10, 1992 1.

hiermination of Lgghge Flow Size Reauest:

Supply a copy of actual data input to the computer program and the corresponding computer output for limit load analysis and leakage flaw size calculation for Case B/G of Table 7-1.

Response

Leakage flaw size, as reported in Table 5-1 and subsequently carried over to Table 7-1, is determined from

• Leak Rate vs. Crack Length" graphs.

A graph is developed for the governing location (node 1020) for each of the three normal. stratification, and heat-up/ cool-down load cases, which are defined in Table 4-2 of WCAP-13100, and labeled as load Cases A B, and C.

The graphs useo to determine crack length in Table 5 1 for Load Cases A, B, and C are attached as figures 1, 2 and 3. respectively.

As can be seen from the graphs, a leak rate of 10 GPM is conservatively selected f rom which the applicable crack length is determined.

The crack lengths found which would produce a 10 GPM leak rate are 4.52 inches for Case A, 3.70 inches for Case B, and 2.50 inches for Case C.

Critical flaw size, as reported in Table 5-2 and subsequently carried over to Table 7-1, is determined f rom Limit Moment tables which are included ir. the WCAP as Figures 5-6, 5-7, 5-8 and 5-9.

The critical flaw size is extracted from these tables, and decreases as the limit moment increases.

The margins as reported in Table 7-1 are the quotients of critical flaw size (for Load Cases A, B or C) divided by leakage flaw size (for Load 3

Cases D, E, F or G), as appropriate.

For Case B/G. this margin is calculated as 7.27 divided by 3.70, which equals 1.9655=5 2.0.

Appropriate conservatism 5 are included in the cals lations to assure an acceptable factor of safety exists (see Table 7-2 of WCAP-13100).

2.

Determination of Gover-inJ Locations Reauest:

Provide a table similar to Table 4-4, which shows the vorst stress of all shielded metal arc weld incations along the line for each load case (Cases A through G),

Attachment I to TXX 92350 Page 2 of 6 ResDonset

\\

The Comanche Peak Unit 2 pressurizer surge t'irr.e contains only cnc (1) shielded metal arc weld (SMAW).

This location is t'te shop weld located at node point 1100.

All remaining welds are gas-tungsten arc welds at the field weld locations ( ref er to Figure 3-1 of WCAP-13100).

For the SHAW at node part 1100, a table similar to Table 4-4 has been developed, and is included herein as Table 1.

Note that although axial force and axial stress are slightly higher at node 1100, moment and bending stress are considerably lower, and hence total stress is lower.

Correctior of calculated loads in Table 1 by the applicable Z-f actor still leads to the conclusion that node 1020 is, overall, the governing location.

1 4

e

TABLE 1 REVIEW OF WCAP-13100 TAELE SIMILAR TO TABLE 4-4 FOR THE GOVERNING SMAW 1

f NODE CASE AXIAL FORCE MOMENT AXIAL BENDING TOTAL I

F(Ib)

M(in-Ib)

- STRESS STRESS STRESS o,4 psi) 0.(psi)

O.'esi) 1100 A

'227.267 870.436 4,0 15 5,457 9,542 II00 B

227,754 940,972 4,094 SE99 9393 1100 C

49,717 1,805 347 894 1i '.?8 12,212

.100 D

248,637 1,756,909 4,470 11,014 15,484 1100 E

249.124 1,84J,223 4,479 11,410 15,889 1100:

F 48,774 1,447,381 879 9,074 9,953 1100 G

71,087 2,527,457 1,278 15,844 17,122

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