IR 05000412/1981007
| ML20011A050 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/15/1981 |
| From: | Lester Tripp, Varela A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20011A049 | List: |
| References | |
| 50-412-81-07, 50-412-81-7, NUDOCS 8110060398 | |
| Download: ML20011A050 (6) | |
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
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Region I Report No. 50-412/81-07 Docket No. 50-412 License No. CPPR-105 Priority
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Category A
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Licensee:
Duquesne Light Company
435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Facility Name:
Beaver Valley Power Station, Unit 2 l
Inspection At:
Shippingport, Pennsylvania J
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InspectionConducte):
August 18-21, 1981 ud 9[/(/8/
Inspectors:
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/[A.A.Varela,ReactorInspector date signed date signed Approved By:
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L.E. Tripp, Chief, Materials and Processes date/ sig'ned
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Section, Engineering Inspection Branch Inspectio Summa _ry; Inspection on August 18-21,1981 (Report No. 50-412/81-07)
Areas Inspected:
Routine, unannounced inspection by one regional based in-spector of concrete placement activities, foundation backfill placement activities and record review of backfill compaction tests, re/iew of 1980 supplement to settlement monitoring program, review and evaluation of a previously identified unresolved concrete item, and observation of corrective actions underway for a potential significant deficiency in structural design of the constructed control room extension. A walk-through inspection of the
construction site was also performed by the inspector. Telephonic inquiry of licensee (Pittsburgh) and S&W (Boston) was made by the inspector to ascertain
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the affect of the structural design deficiency on Unit I control room. The
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inspection involved 24 inspector hours onsite by one regional based inspector.
Results: No items of noncompliance were identified.
Region I Form 12 (Rev. April 77)
8110060398 510917
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PDR ADOCK 05000412 G
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DETAILS 1.
Persons Contacted Duquesne Light Company (DLC)
- (**) R. Coupland, Director of Site Quality Control F.G. Curl, Construction
C.R. Davis, QA Supervisor
- (**) 0.W. Denning, Assistant Director of Site Quality Control W.H. Glidden, Senior QA Engineer
R. Hill, Quality Control Inspector, Batch Plant J. Kowalski, Project Engineer
M.B. Prisuta, Management Consultant
- (**) R. Washabaugh, Manager of QA De;)artment R. Timko, Quality Con' ol Inspector G. Wargo, Supervisor Site Test Laboratory (**)
W. Logan, Chief Structural Engineer, (Pittsburgh Office)
Stone and Webster Engineering Corporation (SWEC)
S.T. Adams, Superintendent of Construction
C.R. Bishop, Resident Manager
R.J. Faust, Site Structural Engineer
(**)
S. Bhatt, Structural Engineer (Boston Office)
(**)
J. Curtin, Senior Structural Engineer (Boston Office)
Beaver Valley Builders Supply (BVBS)
L. Verzilli, Batch Plant Quality Control Manager S. Walker, Batch Plant Operator D_ick Corporation (Dick)
H. Jones, Quality Control Inspector J. Long, Quality Control Consultant NRC
- (**) G.A. Walton, Unit 2 Senior Resident Inspector D.A. Beckman, Unit 1 Senior Resident Inspector
- Denotes those present at exit interview.
(**) Denotes conferees in conference call August 19, 1981.
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The inspector also interviewed other licensee and contractor personnel during the course of the inspection, including construction crafts.
2.
Construction Site Walk-Through Inspection A tour of the construction site was made to observe activities in progress, completed work and plant status in several areas during the course of the inspection.
Tae presence of quality control inspectors, quality control records and equipment preservation was observed. The inspector examined work items for obvious defects or noncompliances and for evidence of quality control of the work. Jertain activities observed by the inspector were noted for fellow-up of inspector con-cerns. One such instance involved certificatioc of the uoncrete batch plant. As required by ACI 301-72, Section 7.1 and Engineering Spec-ifications, the batch plant equipment and facilities must be surveyed by a professional engineer and the concrete output tested for uniformity per ASTM C94-72.
The " Check List for Certification of Ready Mixed Concrete Production Facilities" of the Ready Mixed Corcrete Association provides requirements for conformance to ACI 301. A certificate issued by the NRMCA is valid for two years. The certificate available at the site expired August 21, 1981.
The NRC inspector, on August 20, called licensee attention to the need for a new survey and a val')
certificate. This resulted in licensee issue of a hold on pro 6(. ion of concrete for safety related structures starting August 21.
Subsequently, the.nspector was informed that the Check List for Certification had been completed in July and was accepted by the NRMCA, however, the new certificate was not received at the site until August 24, 1981. The NRC inspector was informed by telecon August 25 that production of concrete for safety related structures was permitted by the licensee to resume on rece!pt of the certificate.
No items of noncompliance were identified.
3.
Status of Construction The licensee informed the inspector that the facility was 44% complete as of August 1, 1981.
4.
Observation of Concrete Activities The inspector observed and discussed with engineering and QC personnel the preparation, placement and curing of concrete for the Safeguards Building pipe tunnel wall #79. The batching / mixing, transportation, pumping and testing of Pour No. 3258 was verified in conformance to codes and standards committed to in PSAR Appendix 8 and Sections 15 and 17; Engineering Specifications 904, " Placing Concrete and Reinforcing Steel"; 940, " Mixing and Delivering Concrete"; ana 903, " Concrete Testing Services"; and QC inspection procedure IP-6.2.3, "Preplacement, Placement and Post Placement of Concrete".
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No items of ncncompliance were identified.
5.
Licensee _ Action on Previous Inspection Concrete Items (Closed) Unresolved Item (81-01-01): Concrete mixes lack consistency in entrained air. As a result of intensive engineering investigative studies made between December 8,1W3 and February 13, 1981, SWEC and DLC concluded that adequate corrective action had eliminated the lack of consistency in entrained air in the concrete mixes. By initiating procedural changes and additional construction controls, it was found after the latter cate that in approximately 1740 cubic yards of air-entrained concrete, no further air-control problems occurred. The inspector observed also that nonconformance reports (N&Ds) resulting from placement of low-air concrete were adequately dispositioned and
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accepted by engineering and quality control.
The inspector evaluated this as satisfactory.
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The inspector had no further questions at this time.
6.
Building Foundations / Structural Backfill a.
Response to NRC Circular 81-08/ Foundation Materials NRC IE Circular No. 81-08 " Foundation Materials" does not require a specific response for Beaver Valley Units 1 and 2 since no construction deficiencies resulting from insufficient compaction of foundation anc backfill materials have occurred. However, the inspector observed in correspondena dated July 17, 1981 from SWEC in response to inquiry from DLC regarding the NRC Circular that both units 1 and 2 have had a comprehensive site QC program during construction which ensured that material and compaction requirements dictated by the specifications were met. Additionally, at both units, an extensive settlement monitoring program was established during, as well as after, construction.
Evaluation
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of the measured settlements has verified they have net exceeded l
the predicted values.
SWEC concludes that NRC concerns expressed (
in Circular 81-08 are not applicable to the Beater Valley power stations and no further action is required at this time.
b.
Observation of Backfill Installation, Compaction and Testing The inspector observed work in progress in placement, spreading, compaction and testing af structural backfill for the diesel generator tank / building at ele /ations 720 to 722. By discussions held with QC inspection and geotech personnel the inspector ascertained that work was correctly accomplished. Testing and inspection activities fu11 filled the requirements established in PSAR Appendix B, Engineering Specification 928 for excavation and placement of fill under structures and final backfill and Inspection Procedure, IP 6.1.
Controls in placement were observed consisting
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of 6" loose fill depth, removal of over 6" stone and a minimum of four passes with approved 48" wheel dynapac.
Testing of alternate lifts was observed to be performed by qualified personnel using a calibrated Troxler nuclear gage model 3411-B in conformance with ASTM D 2922.
Field testing was observed to assure compaction was not less than 95% of soil density as determined by application of ASTM D 1557.
c.
Review of Records for Backfill Soil Tests The inspector reviewed soil test records of backfill installation /
compaction for the diesel generator tank / building beginning at elevation 711. A total of sixteen soil tests taken from July 24 through August 20, 1981 were evaluated for completeness, adequacy and conformance to specifications. All soil test results were found to be above 95% density.
d.
Building 3ettlement Monitoring Program The inspector observed in his review of Supplement No. I to the Report on Settlement Monitoring Program that all buildings throughout their construction have been continuously surveyed by precision optical survey methods.
Supplement No. I covers the year through December 31, 1980. SWEC presents an evaluation of results of the monitoring in this report and concludes that the actual observed total settlements to date are within the magnitude of the predicted settlements.
No items of noncompliance were identified.
7.
Review of Nonroutine Events / Licensee Report of Significant Deficiency, DLC No. 81-02 The licensee reported by telephone to Region I on April 16, 1981 and submitted an interim report on May 15, 1981, in accordance with 10 CFR 50.55e, on design calculations and drawing deficiencies which resulted in a significant deficiency in construction of the Unit 2 control room extension. The inspector observed and evaluated corrective actions being taken to reinforce structural concrete beams and slabs which were constructed in the period 1973-74. Some of the constructed beams and slabs found deficient in reinforcing steel (for conformance to ACI-318-71) were observed being reenforced by the addition of interior columns. Construction and QC are prescribed by approved E&DCR 2PS-1550 C with the specific detcils identified therein and field construction
- procedure (FCP) 105, Strengthenino of Control Room Extension Slabs and Beams.
The licensee committed in his interim report to submission by August 31, 1981 of the final report at the completion of the re-analysis and required modifications.
Pending review of the final-report, the
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inspector stated at the exit interview on August 21, 1981 that t,e had no further questions regarding the corrective actions for Unit 2.
A followup telephone conference between the inspector, the licensee (Pittsburgh), and SWEC (Boston) on August 19, 1981 ascertained the effect of the structural design deficiency of the Unit 2 control room extension on Unit 1.
The inspector was informed by the licensee that SWEC has been asked to check previous work done by the SWEC design group on Unit 2 in the early 1970's to understand if they also worked on Unit I design. The inspector requested that this item be addressed in the Unit 2 final report expected August 31, 1981.
8.
Exit Interview The inspector met at the site with licensee and engineering representatives (denoted in Paragraph 1) at the conclusion of the inspection on August 21, 1981. The inspector summarized findings of the inspection. The licensee acknowledged the inspector's comments.