ML20211N327
| ML20211N327 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/10/1985 |
| From: | Klause R, Oliver J, Wrucke R STONE & WEBSTER ENGINEERING CORP. |
| To: | |
| Shared Package | |
| ML20211M821 | List: |
| References | |
| NUDOCS 8703020047 | |
| Download: ML20211N327 (24) | |
Text
{{#Wiki_filter:Is Job No. 15454.05 Enclosure 1 Page 1 of 5 October 10, 1985 TEXAS UTILITIES GENERATING CO. (TUGCO) COMANCHE PEAK STEAM ELECTRIC STATION LARGE BORE FIELD WALKDOWN REPORT Prepared By MA l J. J. Oliver Field Walk Task Leader Reviewed By R. R. Wrucke Project Engineer Approved R. P. Klause Project Manager 0703020047 870210 PDH ADOCK 0b000445 A PDR 00013-1545405-N1
Page 2 of 5 INTRODUCTION A san.ple verification of existing unit 1 as-built documentation for large bore Class 2 and 3 piping systems was performed in accordance with Project Procedure CPPP-5. The purpose of this effort was to establish sufficient confidence in the adequacy of dimensions and functions shown on the as-built drawings to support initiation of the pipe stress requalification effort. This report summarizes the findings and conclusions of the verification effort. This walkdown does not (and was not intended to) verify TUGCO's as-built program. However, the results of this walkdown tend to indicate that the as-built program implemented by TUGC0 is adequate. . Verification of the as-built program is within the scope of the Construction Adequacy Program (Appendix B of Comanche Peak Response Plan and Issue-Specific Action Plans). Each revision to piping' system as-built documentation, resulting from all project activities (including the Construction Adequacy Frogram) will be evaluated by SWEC for specific impact on the piping requalifica-tion effort and the need to revise the applicable pipe stress and support package. SCOPE , Four unique samples were randomly selected to verify the following attributes: (a) Valve Location (b) Pipe Support Location ! (c) Pipe Support Function (d) Valve and Support Orientation These attributes were selected because they have the greatest potential for impact on the pipe stress effort. Other less significant attribute:s
~
, exist, but the methods of verifying the above attributes (distance from l elbows, tees, valves, supports, etc.) indirectly verify other attributes (e.g., dimensions and configurations). The total population and sample size for each attribute is shown on Attachment 1. The sample sizes and accept / reject criteria were determined from SWEC Quality Assurance Directive (QAD) 7.11 Rev. A. SWEC tolerances were established for each attribute. These tolerances are consistent with tolerances previously used by SWEC on other as-built programs. The tolerances also consider the sensitivity of the data to the pipe stress analyses. SUM 1ARY OF RESULTS . Approximately 1800 manhours were expended, over a period of three weeks, to complete the physical walkdown. 00013-1545405-N1
Page 3 of 5 The results of the fieldwalk follow:
- Valve Location . Valve locations are adequately described.
Seventy-nine of the 80 valves were found to be within SWEC tolerances. Valve number 1-8107A was determined to be outside SWEC required tolerances. (See Attachment A)
- Pipe Support Location -
Pipe support locations are adequately described. Of the two hundred supports sampled, 199 were within SWEC tolerances. Pipe Support Number CT-1-014-405-C82K was determined to be outside SWEC required tolerances. (See Attachment B)
- Pipe Support Function - All 200 of the pipe support functions are adequately described.
- Valve And Support Orientation - Valve and support orientations are not adequately described. One hundred-ninety of the 200 supports and valves sampled were within SWEC tolerances. The following discrepancies were observed:
Diff of Valve / Support As-Built SWEC Actual Dim. As-Built See -
- l. Number Dimension Tolerance By SWEC Vs Actual Attachment I
AF-1-101-027-S63R 5'-31' 15' O.3' 5.2* C CS-1-155-036-S42R O' 15' 6.3' 6.3* D CS-1-217-002-A42K O' 15' 6.2' 6.2* E CS-1-258-702-A53R O' 5* 6.7' 6.7* F CT-1-010-008-S22K- 0* 5' 6.0* 6.0* G CT-1-122-002-S32R O' 15' 6.1* 6.I' H l SW-1-037-007-J03R O' 15* 7.0* 7.0* I
-CC-1-007-043-A63R O' 15' 6.0* 6.0* J 14F-055 45* 5' 55.0* . 10.0* K
! ICH-073 60* 15' 35.0* 25.0* L ) During the conduct of the walkdown there were only 14 items that were I inaccessible. These items were replaced with other items, using the ! same random sample selection process used for initial sample selection. I CONCLUSIONS
- 1. The as-bhilt documentation of pipe support and valve orientation is adequate to initiate the stress requalification effort. However, l
the stress results cannot be finalized until appropriate corrective l action relative to verification of valve orientation and the orientation of pipe supports fabricated with catalog components is implemented. All instances where supports were not oriented within l SWEC tolerances involved catalog components (i.e., struts or l snubbers). The catalog components' paddles were misaligned with the clamps. No cases of misalignment were observed with box frame type supports (i.e. no catalog components.) 1 00013-1545405-N1
Page 4 of 5 NOTE: A review of the sub populations (supports with and without catalog components) was made to verify that a sufficient number of supports without catalog components were
- sampled. More than 70 of these supports were verified and all were within tolerance. Therefore, sufficient samples were reviewed to support the conclusion that.the concern is limited to supports with catalog components.
Upon investigation of the discrepancies identified, SWEC discovered that two of the out of tolerance situations were previously identified by the TUGC0 As-Built Group but are currently not resolved by the project. ACTION REQUIRED < 1.1 Orientation of all ASME valves that could cause eccentric loading on the pipe (e.g. motor operated valves, but not gate , valves) should be verified. This effort should begin as soon as possible to minimize the impact c.n the requalification
~
effort. SWEC will oversee this effort on an auditing basis. 1.2 Orientation of ASME pipe supports fabricated with catalog components should be reverified to identify and resolve all situations which exceed specified tolerances. Resolution of this concern in many cases will require rework of the supports i to properly align the clamp and strut / snubber end paddle. SWEC will oversee this effort on an auditing basis. l 1.3 The valve and support orientation concern shall be resolved. Appropriate preventive action should be taken to assure that the final as-installed condition is not changed in the future
. (e.g. during maintenance activities).
, 1.4 All TUGC0 As-Built Group identified items, that have not been resolved by NCR or drawing revision, should be reviewed to
. determine the cause and extent of this conce'rn and appropriate corrective and preventive action should be implemented.
- 2. The project' implemented the same As-Built Program for all Class 1 piping, High Energy Clas's 2 and 3 small bore piping and all Class 2 and 3 large bore piping. Since ' the same program was implemented, the results of.the large bore walkdown can be considered representa-tive for all of this piping, provided the corrective action to be implemented includes all Class 1 piping and high energy Class 2 and 3 small bore piping. For those lines which were not as-built in accordance with the large bore As-Built Program, a walkdown shall be performed to establish sufficient confidence in the accuracy of dimensions and support functions shown on the latest design
- documents to initiate the small bore stress requalification.
ACTION 2.1 TUGC0 should identify the small bore stress problems that were not as-built in accordance with the As-Built Program. 00013-1545405-N1
Page 5 of 5 2.2 SWEC will perform a walkdown for the piping identified by TUGCO. This walkdown shall be similar to the program described in Project Procedure CPPP-5, and this report. ComfENTARY In addition to the specific conclusions identified above, some engineering inferences about the adequacy' of the as-built documentation (to support stress requalification) can be made. These inferences are:
- 1. All installed components are appropriately reflected on the as-built documenta tion. The location of supports and valves were verified by measurement to the next component (e.g.,
support, valve, fitting) installed within the system. No components, within the Class 2 and 3. stress systems, were observed to be installed but not identified on the drawings.
- 2. The piping and support configuration (layout and geometry) are appropriately described on the drawings. The method of verifying valve and support location (distance from elbows, tees, valves, supports etc.) indirectly verified the piping system dimensions and configuration.
Although one of the four attributes did not meet the established acceptance criteria, it is not necessary to perform any additional walkdowns for large bore piping prior to initiation of pipe stress analysis. This decision was based on the following judgements:
- 1. All attributes with significant impact on analyses have been walked down.
- 2. The Construction Assessment Program will fully assess the adequacy of as-built documentation against the construction tolerances. Changes to the as-built documentation that affect pipe stress analysis and support designs will be fully evaluated by SWEC on an ongoing basis.
l l l l 00013-1545405-N1
ATTACHMENT 1 Page 1 of 1 LARGE BORE FIELD WALKDOWN POPULATION AND SAMPLE SIZE / SELECTION I. Population / Sample Size TOTAL SAMPLE Source of Accept / ATTRIBUTE POPULATION SIZE Total Population Reject Valve Location 913 - 80 Note 1 1/2 Support Location 8042 200 Note 2 5/6 Support Function 8042 200 Note 2 5/6 Valve and Support Orientation 8955 200 Note 3 5/6 _ NOTE I - List of valves developed by SWEC from review of BRP Drawings in SWEC Scope. I NOTE 2 -
"As-Built-LBH-PROB-RPT" -
Computer listing of Comanche Peak Large Bore Supports sorted by Stress Package, dated 6-20-85. l NOTE 3 - Combination of both lists identified in Notes 1 and 2 above. II. Sample Selection The specific samples were selected as follows:
- 1. Consecutive numbers (from 1 to the population size) were assigned to each ites listed in the appropriate index (Notes 1, 2 and 3).
- 2. Four sets of numbers (one set for each attribute) were selected from a random number table.
- 3. The ites (valve or support) corresponding to the random number was selected for the walkdown.
00013-1545405-N1
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4 I Enclosure 2 Page 1 of 1 MISCELLANEOUS OBSERVATIONS FROM LARGE BORE WALKDOWN The following conditions outside the scope of CPPP-5 were observed during the walkdown effort.
- 1. Pipe support CC-X-109-016-A65R is a voided support but is still installed in the field. This support does not appear on the hanger location drawing BRHL-CC-X-AB-041. Upon investigation, this support was requested to be removed via a memo dated May 22, 1979. SWEC walked down 8 of the 32 supports listed on this meno and all were found to be removed as requested.
- 2. The .s trut . for support CC-1-116-002-F33R is stamped as CC-1-159-017-S53R. Reference BRKL-CC-1-FB-001. i
- 3. Support SW-1-129-046-A43R is shown correct dimensienally but is incorrect pictorially on BRHL-SW-1-AB-005. The support is shown as being located east of the tee; actually, it is located west of the .
tee.
- 4. Support CC-1-033-005-S33K -
The bottom two bolts on the south baseplate are not in full contact with the baseplate.
- 5. Support CC-1-204-019-C53R - A 3/4" 9 stainless steel line appears to be in contact with the strut. A rod hanger for the 3/4" 9 line is disconnected from the pipe in this area.
- 6. , Support CC-1-011-007-A53R - Loose jam nut on strut.
- 7. BRP-BR-X-AB-005B Rev. 11 - Valve is identified as 1-8564A on piping drawing but is tagged as 1-8564B. Valve 1-8564B is tagged as 1-8564A. ,
- 8. Supp'rt o CT-1-011-005-S22K - Items 11 and 12 are tube steel per revision 2 of drawing; however, original items 2 and 10 (W8x20) are still installed.
- 9. Support CT-021-001-S22R - Bearing is loose in strut paddle on clamp end.
- 10. Drawing BRP-MS-1-SB-045, revision 1, incorrectly shows the elevation of valve IMS-063 at 887'-4 5/16". The elevation should be 877'-4 5/16".
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