ML20039F668
| ML20039F668 | |
| Person / Time | |
|---|---|
| Issue date: | 12/04/1981 |
| From: | Costello J, Hale C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML20039F659 | List: |
| References | |
| REF-QA-99900519 NUDOCS 8201130203 | |
| Download: ML20039F668 (12) | |
Text
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ORGANIZATION: BECHTEL PCWER CORPORATION GAITHERSBURG POWER DIVISION GAITHERSBURG, MARYLAND REPORT NO.: 99900519{81-04 INSPECTION DATE(S): 11/2-5/81 llNSPECT10N ON-SITE HOURS: 28 CORRESPONDENCE ADDRESS:
Bechtel Power Corporation Gaithersburg Power Division ATTN: Mr. J. M. Komes, Vice President and General Manager 15740 Shady Grove Road Gaithersburg, MD 20760 ORGAN!ZATION CONTACT:
Mr. D. C. Kansal, QA Manager TELEPHONE:
(301) 258-3776 PRINCIPAL PRODUCT:
Architect Engineering Services NUCLEAR INDUSTRY ACTIVIW: The Gaithersburg Power Division has a total of 2767 em-ployees of which 2248 or 81% are assigned to nuclear projects. Major projects in-clude Callaway Units 1 and 2, Wolf Creek Unit 1, and Grand Gulf Units 1 and 2.
There are also modification / repair / service contracts on 14 additional reactor units.
,1 s
ASSIGNED INSPECTOR:
V
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J. R. Qsjelld, React 6/ Systems Section (RSS)
Date OTHER INSPECTOR (S):
APPROVED BY:
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C. J. H Q d, Chief, RSS Date INSPECTION BASES AND SCOPE:
A.
BASES:
10 CFR Part 50, Appendix B; SNUPPS PSAR, Chapter 17; and Grand Gulf PSAR, Chapter 17.
B.
SCOPE:
Design input, design verification, and action on two regional requests:
(1) incorrect beam sizes for electrical trays, Grand Gulf; and (2) pipe whip restraint design discrepancies, SNUPPS.
I)ESIG"ATED ORIGN,_7 comnean h g Q -)LitZ i -
8201130203 811208 PDR GA999 EECBECH 99900519 PDR J
BECHTEL POWER CORPORATION GATTHERSBURG POWER DIVISION ORGANIZATION:
GAITHERSBURG, MARYLAND REPORT NO.: 99900519/81-04 INSPECTION RESULTS:
PAGE 2 of 3 A.
VIOLATIONS:
None B.
NONCONFORMANCES:
None C.
UNRESOLVED ITEMS:
None D.
OTHER FINDINGS OR COMMENTS:
1.
Design Input and Design Verification - SNUPPS PSAR Chapter 17, Grand Gulf PSAR Chapter 17, Engineering Department and Engineering Project Procedures were examined to determine quality assurance program commitments. To verify implementation of these commitments, the following documents were examined:
3 design criteria documents,13 drawings, 3 system descriptions, 14 calculations,1 project summary "Q" list,1 design review notice, 2 design control check lists,1 licensing commitment tracking system, and 6 specifications.
Relative to the documents examined, all procedural commit-ments were being properly implemented.
2.
Construction Deficiency Report - Incorrect Beam Sizes for Electrical Trays.
Mississippi Power and Light Company (Grand Gulf) reported to Region II that an Architect Engineering (AE) reevaluation had determined that incorrect beam sizes for electrical seismic Class I tray supports were purchased and installed at 76 tray locations.
The purpose of this inspection was to determine if this was a generic problem and if there was a breakdown in the AE's quality program.
Examination of drawing C-1415A, Revision 18, "Auxi-liary Building Electrical Tray Supports Typical Standard Details," showed that the drawing had correctly stated the requirements.
The error was made when Bechtel construction site personnel incorrectly translated the require-ments from drawing C-1415A to their fabrication requests.
The site personnel discovered the error and took appropriate corrective and preventive action.
Since Grand Gulf is the only Gaithersburg Power Division (GPD) construction project, this item has no further generic potential at GPD. Management Corrective Action Request (MCAR 35) was issued August 20, 1981, to alert other Bechtel power divisions of a similar potential problem.
The error appears to have been the fault of one individual onsite that failed to l
consider a necessary note on the design drawing (C-1415A).
No further action at GPD appears warranted.
3.
Pipe Whip Restraint Design Deficiencies.
The purpose of this inspection was to determineif there had been a break-down in the Bechtel GPD design process.
BECHTEL POWER CORPORAT10N
, ORGANIZATION: GAITHERSBURG POWER DIVISION GAITHERSBURG, MARYLAND R N NO.:
99900519/81-04 INSPECTION RESULTS:
PAGE 3 of 3 During an inte nal design review by Bechtel GPD of the SNUPPS " Design Guide for Pipe Whip Restraints," a discrepancy was identified between this Design Guide and Bechtel's BN-TOP-2, " Design for Pipe Break Effects."
The discrepancy involved the absence in the Design Guide of the require-ment for an energy balance analysis in the design of pipe whip restraints in those cases where the formation of a plastic moment in the pipe could not be prevented.
This discrepancy was reported as a 10 CFR 50.55(e) item by SNUPPS to Regions III and IV.
A method had been developed by SNUPPS project engineering personnel which was considered superior for those cases where a plastic hinge is developed.
During the internal Bechtel design review, the consensus was that this method was not conservative enough, was in violation of BN-TOP-2, and did not provide for the increase of size of the energy absorbing material or the U-bolt diameter of the Pipe Whip Restraints (increase in size was caused by rounding off dimensions for commercial procurement).
The method developed by SNUPPS project engineering personnel had several unquantified conservatisms which, if evaluated, may have shown the re-straints were adequate.
However, such an analysis was not performed, instead -103 of the 242 restraints issued for construction were reanalyzed using the energy balance technique, and/or the lumped-mass dynamic model, and 44 restraints were revised.
Both the FSAR and the Design Guide were revised to allow for the formation of plastic hinges within acceptable ductility ratios in pipe whip restraints and to permit the use of dynamic analysis in pipe whip restraint design as an alternate to the energy balance technique.
No nonconformances or unresolved items were identified in this area of the inspection.
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