IR 05000338/1989004
| ML20246D389 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/26/1989 |
| From: | Blake J, Chou R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20246D384 | List: |
| References | |
| 50-338-89-04, 50-338-89-4, 50-339-89-04, 50-339-89-4, IEB-79-02, IEB-79-14, IEB-79-2, IEIN-86-094, IEIN-86-94, IEIN-88-025, IEIN-88-25, NUDOCS 8905100214 | |
| Download: ML20246D389 (9) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
REGION ll
,o 101 MARIETTA STREET, N.W.
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ATLANTA, GEORGI A 30323
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l Report Nos.:
50-338/89-04 and 50-339/89-04 Licensee:
Virginia Electric and Power Company Glen Allen, VA 23060-Docket Nos.:
50-338 and 50-339 License Nos.:
NPF-4 and NPF-7 Facility Name:
North Anna 1 and 2 Inspectio Co ete :
rch 6-10, 1989
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Inspecto.
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M oli Date Signed Approv d b d
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. J. Blake, Chief Date Signed a rfnis and Processes Section En ineering Branch Division of Reactor Safety l
SUMMARY Scope:
This routine, announced inspection was conducted in the areas of seismic analyses for as-built safety-related piping systems (IEB 79-14).
Results:
In the areas inspected, violations or deviations were not identified.
Two Unresolved Items (UNR) were identified concerfing piping system (paragraph 2f) and Hilti anchor bolt (paragraph 2.c) problems. The major concerns are the apparent generic problems that anchor bolt minimum center-to-center distance requirements are not being met and in that load pins and clamp studs threaded sections are within the load bearing area of the struts or si,ubber clamps, t
8905100214 990428 DR ADOCK 05000338 PDC
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REPORT DETAILS
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Persons Contacted
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g, Licensee Employees
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- M.
L.' Bowling,. Assistant Station Manager
- D. C. Compton, Senior Staff Engineer : Mechanics, Innsbrook
- R. F. Driscoll, Quality Assurance (QA) Manager
- L. N. Hartz, Configuration Management Supervisor
- P. A Kemp, Licensing Supervisor
- G. E. Kane, Station Manager
- J. H. Leberstein, Licensing Engineer G. Seay, Quality. Control (QC) Inspector
- C. E. Sorrell., Engineering Mechanics Supervisor, Innsbrook
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- L E. Wroniewicz,. Design Engineering Supervisor
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Other' licensee employees contacted during this inspection included craftsmen,. engineers, mechanics, technicians, and administrative personnel.
NRC Resident Inspectors
- J. L. Caldwell, Senior Resident Inspector L. P. King, Resident Inspector
- Attended exit interview 2.
(Closed) Seismic Analysis for As-Built Safety-Related Piping Systems for Units 1 and 2 (IEB 79-14) (25529)
a.
Walkdown Inspection of Instal' led Piping and Hangers The inspector randomly selected five isometrics in three systems which included 30 pipe supports that had been QC finally inspected for Service Water Lines, Chemical Volume Control Misc. Piping, and RC Laops 1, 2, and 3 of Low Head Safety Injection & RHR System.
The pipe sypports were reinspected with the assistance of a QC inspector and an engineer. The supports were reinspected against their detail drawings for configuration, identification, base plates, fa'stener/
anchor installation, member size, weld sizes, component identifica-tion numbers, dimensions, rust, maintenance, clearance, and damage protection.
Some support were only partially inspected because of a high radiation area, high elevation or inaccessibility.
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b.
Summary of Walkdown Results The results were discussed with the QA/QC inspector and engineers.
Listed below are the discrepancies and comments identified by the inspector during the walkdown.
Unit Piping Isometric / Pipe Support
_NA Discrepancy / Comment-Iso 12050-ECI-105A
-WS-A-003
None-WS-A-21
Anchor bolt at East end of wing plate extended out about 3" from top of base plate.
l (Hilti code w was read for verifying the embedded length).
Anchor bolt at North-East location extended out 3-3/4" from top of base plate and shim 1"x 2-3/4" x 2-3/4" was not shown on the drawing.
(Hilti code w was read for verifying the embedded length).
-WS-A-23
Weld size 1/2" was measured for 3/8" pad attached to pipe and drawing showed 1/4".
1"& anchor bolt near a wing plate at North side had 6-1/2" center to center from a 3/4"4 anchor bolt for the
adjacent support Mark No. 2-WS-R-005.
The 6-1/2" is less than the 9-1/4" i
minimum spacing requirement l
and was not shown on drawing per requirements of Specification No. NAS-1023.
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Un i t '-
i Piping Isometric / Pipe Support No.
Discrepancy / Comment i
(cont'd)
l-WS-R-23
' Tube steel' 5"x 5"
for a-horizontal bracing,-
base
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plate size, and size of'
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anchor bolts for Section 3-3 were not specified.
on drawing.
-WS-R-005
Two anchor bolts at. South and South-West corner of Section E-E had about 5-1/2" center to center distance-from two anchor bolts of an adjacent Support Mark No. 2-WS-A-33. The 5-1/2" is-less than the minimum spacing requirement and was not shown-on drawing per -' requirements of Specification No. NAS-1023.
l Anchor bolt at South side had
6-1/2" center 'to center as j
stated above at' Support Mark
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No. 2-WS-A-23.
-WS-R-006
'2 None l-WS-R-006 A
The vertical distance from the' center line of tube steel
8"'x 8" to.the bottom edge of the base plate was measured-WS-R-015 A 10" and drawing showed 8".
-WS-R-015
Four 3/4"9 I;ilti anchor bolts for the base plant were not shown on drawing.
-WS-R-13
None
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-WS-R-13A
None-Iso 11715-ECI-118N 1&2-CC-A-9
None
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Unit I
Piping Isometric / Pipe Support No.
Discrepancy / Comment (cont'd)
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-CC-R-110
None Hilti code w was read for verifying the embedded length.
-CC-R-121
None-CC-R-122
Plate 1/2"x3"x4" was not in field.
Three places of weld at a i
right and vertical gusset plate of Section 1-1 should be partial penetration welds as shonw on drawing instead of 1/4" fillet weld found in the field.
-CC-HSS-415
Two base plate sizes of 1-1/2" x 25" x 29-3/8" and 1-1/2" x 25" x 27-1/2" were measured, drawing showed 1-1/2" x 25" x 25" on Item No. 8 of page 6 of 6.
Grinnell Strut Figure No. 200 existed in field and drawing showed Figure No. 201.
-CC-R-417
None l-CC-R-418
3/4" thread was found within the inside area of two clamps at the upper clamp stud.
-CC-SH-111
None-CC-SH-112
Load scale was painted over.
l-CC-SH-125
Some area of the load indication plate was painted over and cold load scale was estimated approximately 8000#.
Drawing showed cold
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load = 9776#.
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Unit Piping Isometric / Pipe Support No.
Discrepancy / Comment (cont'd)
2" and 1-1/4" threads were found within the inside area of two clamps at the load pin and the lower clamp stud.
Threads were found within the inside area of two clamps at the lower clamp studs for two supports one support upstream of this line and the other support upstream of the next line.
-Iso /2050-ECI-113 A
-2-12-SI-R-13
Weld symbol and size for five connections between tube steel "4x4" and base plates were not shown on drawing.
-SI-HSS-106A
3/6" fillet welds at top and far side of connection between plate 1" x 5" x 5" and the snubber and attachment, drawing showed 1/4" fillet weld all around.
1/2" thread was found within the inside area of two clamps at the outer clamp stud.
-SI-R-20
Sections 2-2 and 3-3 on drawing should be Section 1-1 and 2-2.
-Isc 12050-ECI-113B
-SI-R-4
None-SI-R-12
The horizontal tube steel 4"x4" located at right side of Section A-A was estimated about 12" long (near ceiling)
and drawing showed 5" long.
-SI-R-16
None
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L Unit Piping Isometric / Pipe Support No.
Discrepancy / Comment (cont'd)
-SI-HSS-102A
None-Iso-12050-ECI-113C
None-SI-HSS-104A
.None
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-SI-R-9
None Note:
Iso 12050-ECI-105A -- Service Water Lines, Unit 2.
Iso 11715-ECI-118N -- Chemical Volume Control Misc. Piping, Units 1 and 2.
Iso 12050-ECI-113.A, B, C'-- RC Loop 1, 2,.3 of Low Head Safety Injection and RHR Systems.
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Some. discrepancies / comments, especially the measured Hilti Code leters for anchor bolt length shown on the above list may not be the discrepancies. The licensee's engineer did not provide the inspector the manufacturer's catalog during the inspection to verify that-the anchor bolts were installed as'specified. The licensee's engineer stated that it would take some time to retrieve the documents.
The result of discrepancies during this inspection is stated in Paragraph 2.f.
c.
Hilti Anchor Colt Problems Hilti-anchor bolts were used in both units. IEB 79-02 required the licensee to determine the anchor bolt allowable loads based on testing the capacity in the field or using catalog capacity published by the manufacturer if QA document is available.
NRC Information Notice Nos. 86-94 and 88-25 requested that licensees who use the Hilti anchor bolts review the allowables used in design calculations since the NRC had found that the field test capacity was 3094 - 40?s below the catalog due to the various concrete mixtures and shorter edge distance requirements.
The inspector discussed these notices with the licensee engineers. The licensee stated that the field test capacity was used for Hilti anchor bolt allowables to qualify the pipe supports for IEB 79-02.
The test results and evaluation were not available for review. The licensee had completed the review of NRC Information Notice No. 86-94 but no documents are available now.
For NRC Information Notice No. 88-25, the licensee is waiting for the decisions from NRC and the industrial trade group to take an I
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appropriate resolution.
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The inspector found some discrepancies concerning Hilti anchor bolts as stated in Paragraph 2.b.
They are the bolt diameter difference, the extended protrusion, the violation of minimum center to center distance requirements, the edge distance differences from drawings etc.
The licensee should consider the violation of the minimum center to center distance requirements as a potentially generic problem since it involved three supports.
Pending the licensee's eview this item is identified as Unresolved Item (UNR) 50-338, 339/89-04-02, Hilti Anchor Bolt Problems.
d.
Pipe Support Calculation Review
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Several support design calculations for Unit 2 were reviewed.
The inspector noticed that a design method based on American Institute of Steel Construction (AISC) was used to qualify the expansion anchor bolts for Support Nos. 2-WS-A-3, 2-WS-A-12, and 2-WS-A-23. The AISC method normally is used to qualify bolts or rivets for steel to steel connections. The expansion anchor bolts are different from the AICS bolts or rivets since they involve steel and concrete. The inspector questioned the licensee's engineers whey the AISC design method could be used to qualify the expansion anchor bolts.
The licensee's engineers replied that the AISC design method used in North Anna was approved by NRR.
The inspector requested the licensee's engineer supply the approval letter out did not receive it.
The inspector told the licensee engineers that the calculations would be reviewed thoroughly later.
e.
Bulletin Closure
i The NRC Region II Inspection Report Numbers 50-338/80-08, 80-23, I
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80-28, 82-27, and 88-29 for Unit 1 and 50-339/80-06, 80-23, 80-27, 82-27, 88-29 for Unit 2 were performed for IEB 79-14 to verify and review the procedures, inspection programs, analytical methods, modifications, and documentation.
The inspector also performed
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walkdowns in this inspection as stated in Paragraph 2.a and 2.b to verify the licensee performance and commitments on IEB 79-14.
The licensee did not submit a final summary report to NRC for review after it completed all analyses, evaluations, and modifications, the licensee should submit a final summary report tc summarize the responses and activities including the procedures, analytical methods, modifications, and documentation to meet the requirements of IEB 79-14.
Based on the previous inspection reoorts and this inspection, IEB 79-14 is considered closed except for the open items.
f.
Finding and Results The above discrepancies found between the field and as-built drawings
were discussed with the licensee engineers and QC inspector.
The previous inspector also found some discrepancies and main steam line
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drawing illegibility as stated on Inspection Report No. 50-338, 339/88-29.
Pending the licensee's resolution of discrepancies on this and previous inspections except the Hilti anchor bolts which is
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a separted item, the inspector's review on support calculations, and a l
submittal of the final summary report, this item is identified Unresolved Item 50-338, 339/89-04-01, Piping System Concerns.
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3.
Exit Interview
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The inspection scope and results were summarized on March 10, 1989, with those persons indicated in paragraph 1.
The inspector described the areas
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inspected and discussed in detail the inspection results listed below.
Proprietary information is not contained in this report.
Dissenting comments were not received from the licensee.
The inspector indicated that a design method based on the AISC to qualify the expansion anchor bolts was used in the support design calculations.
The licensee's engineers said that the AISC method used in North Anna was approved by NRR, but could not retrieve the approval letter.
The inspector stated that the acceptability of AISC method will be determined by a detail review later.
(Closed) IEB 79-14 (0 pen) UNR 50-338, 339/89-04-01, Piping System Concerns (Open) UNR 50-338, 339/89-04-02, Hilti Anchor Bolt Problems.
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