IR 05000282/1990007
| ML20042G346 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 05/07/1990 |
| From: | Gardner R, Neisler J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20042G343 | List: |
| References | |
| 50-282-90-07, 50-282-90-7, 50-306-90-07, 50-306-90-7, NUDOCS 9005140127 | |
| Download: ML20042G346 (4) | |
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... U. S. NUCLEAR = REGULATORY COMMISSION , ,'
REGION III
. Reports ~.Ho.:;50-232/90007(DRS);50-306/90007(DRS) ,
A Docket Nos.: 50-282; 50-306 Licenses No.: DPR-42; DPR-60 t
Licensee: Northern States Power Company , 414 Nicollet Mall
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- Minnepolis, MN 55401 Facility Name
- Prairie Island Nuclear Generating ~ Station-
Inspection At: Walch. MN.55089 Inspection Conducted: April 23 through 27, 1990 8' 2'[O Inspector.
. jsA -[.H'.Nisler~ Date , W . Approved:By: ' ' ["74D . . R..H. Gardner, Chief Date l Plant'. Systems Section - a
' Inspection--Summary- ' , inspection on Apr n 2S-27:, 1990 (Reports No. 50-282/90007(DRS); 50-306/90007(DRS)) .l Areas Inspected: Routine announced inspection to review and evaluate the
licensee's construction plans and procedures for controlling the installation .of-the: Station Blackout / Electrical System Upgrak Modification-(37700)(SIMS USIA44).
Results:. No violations or deviations'were identified. The licensee's ! , -construction plans and procedures that have been completed or are in~ development appear to be adequate to assure that quality req 1irements for the Station-Blackout Modification are established and properly implemented.
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Ngrthern States Power Company (NSP) [ % G. Goering,; General Superintendent, Construction A
- J. Maki,; Project Engineer
- i J.' Byrstrzycki, Project Superintendent, Quality. Control
- C, Crosby, Nuclear Projects Quality A surance
i*R.. Sitek, Nuclear Projects Quality. L.5urance ~
- B. Desai, Senior Mechanical Engineer-
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- R. - 0' Bryan,- Project Superintendent
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- T..Winberg, Civil Construction' Superintendent
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- L. 'Ganzer, Nuclear Operations. Quality Assurance
- A. Rothstein,; Quality Control. inspector, Receiving _
g W. Chaney', Civil Inspector- , r i Huclear Regulatory Commission- (NRC) - P. Hartmann, Senior Resident. Inspector j I
- Denotes.those persons-attending the exit interview on April 27, 1990
~ L 2.
Review of' Design Requirements and Construction Plans for the Station.- Blackout / Electrical Systems Upgrade (SB0/ESU) Modification - a.
-Theilicensee.has developed design requirements, construction procedures . and quality. verification procedures-for earth work and baskfill.- "
Specification HI AW1024000-59-S901,." Site-Preparation and arthwork" y ~ ' delineates requirements for excavation and backfill activities . .
- including compaction and density criteria for backfill. The inspector m
P P observed backfillLactivities and qualityiverification of thase: ' activities... Quality control inspectors-were performing compaction .. - tests (Procter). and density measurements ~(sand cone)'.as required. by
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procedure's.- Test results met or exceeded requirements'for-compaction and density in the backfill that had been tested and accepted by the ' quality contro11 department.
- b.
The inspector reviewed ~ concrete mixing and placement procedures.-and specif. cations. The specifications included cement' content, water-cement ratio, aggregate size and gradation, and 28-day i compression strengths.
Procedures for performing slump tests, grout.
j cube tests, air content tests,-test cylinder curing and. compression tests have been developed and will be implemented upon-commencement
of' concrete work-activities.
The specifications and procedures meet.
J-the requirements of the appropriate American Concrete Institute .: -(ACl), American Society for Testing and Materials-(ASTM), and the ' A;my Corps-of Engineers standards and recommended practices.
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., w t Concrete reinforcement is to be' ASTM A615 Grade 60 billet steel !' deformed bars (rebar) sized to conform to concrete mass and structural requirements.
The inspector observed partial shipments . of rebar at the-job site.
Bars were clean, stored on dunnage and protected from damage by construction activities.
The bars were { shop bentLand identified as to size and their location within the~ - ! structure.
3.
Revi'ew of Quality Assurance / Quality Control Requirements, Procedures, . ond Work Instructions for the SB0/ESU Modification [ a.
The inspector reviewed procedures and work instructions-to determine whether the applicable codes, standards.and regulations were being . included in. design documents and procedures. Design documents, work instructions-.and procedures either incorporated or. referenced the applicable codes,. standards and regulations for structural, mechanical,= , electrical and quality activities.
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The-inspector reviewed inspection requirements for structural concrete
' and rebar. -Procedures have been developed for inspection of construction activities by the -Quality Contrd Department.. Procedures l
' include concrete inspection and te; ting in G ding slump, grout'- strength, concrete strength, air entrainment, oggregate and water , quality. The licensee's plans for controlling concrete activities. ' include quality inspectors at the Siteil plant av! the placement site when concrete mixing and placement is being performed.
The licensee has developed rebar installation _ and cadwelding procedures.
Inspection will be performed to assure the adequacy of ' the Cadwelds and tests of Cadweld splices will'be performed as stated-in the following schedule:. One of the first ten production splices;
. One production and three sister splices of the next 90 splices;- , and One production and two sister splices of the next and .
subsequent units of 100 splices.
The procedure requires at least one-fourth of all splices tested - to be production splices. Acceptance criteria for Cadweld splice tests is 90,000 pounds / square inch minimum average with a minimum single splice of 75,000 pounds / square inct ust result, c.
The inspector reviewed two Quality Assurance Department surveillance reports of activities relative to the SB0/ESV modification. The two . reports were* (1) SR-PI-3396 - Engineering Change Repor+s (ECR) Review. This-surveillance report documented the quality assurance review of J the SB0/ESU engineering change program.
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.(2)c SR-PI-3419 05/D6 Building-Construction Activities. This= . report included quality assurance observations of, activities- ,. 7 ~, by construction contractors'on the SB0/ESU project.
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Observation of Ongoing Work " t .The inspectorLobserved subgrade compaction and preparation prior to t installation of the mud-mat for base slabs elevations 687 and 695....Tho ' licensee ls' civil: quality inspectors performed compaction and density tests- , , on the prepared and compacted subgrades prior to-the mud mat placement.
During the mud mat placement, the licensee -used the nonsafety-related mud: y mat concrete' placement to test and' improve quality inspection techni_ ques.;
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The' quality. inspectors performed concrete slump tests, air entrainment- ' tests and: prepared compression: strength cylinders from each elevation placement.' The: inspector toured the' ons'ite test facility.. The test facility appeared: ' to be'adequetely equipped to perform the onsite portion of the test program,The licensee is also using the services.of'an offsite test n
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laboratory to perform tests that require specialized equipment not-available in the onsite facility.
- l 15.
Exit Interview- ~ The' inspector met with licensee representatives (denoted in: Paragraph 1):. at the conclusion of the inspection and summarized the/scopeLand findings .ofLthe inspection..;The inspector discussed the likely informational.. a content of the: inspection report with' regard to~ documents or processes ~-
reviewed by the inspectors during the-inspection.. The licensee did:not . identify.any..such documents or processes as proprietary, s.
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