IR 05000213/1987026

Insp Rept 50-213/87-26 on 870831-0904.No Violations Noted. Major Areas Inspected:Foundation Design & Const Activities for New Switchgear Bldg to Fulfill Licensing Commitments Re Compliance w/10CFR50 App R

ML20235W468
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	10/05/1987
From:	Strosnider J, Varela A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
Shared Package
ML20235W461	List: IR 05000213/1987026 ML20235W459
References
50-213-87-26, NUDOCS 8710160246
Download: ML20235W468 (5)

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n V s U.S. NUCLEAR REGULATORY COMMISSION

REGION I

Report N /87-26 7- Dock'et N License: N DPR-61 . Priority '

Category C Licensee: Connecticut Yankee At'omic Power Company P.O. Box 270 1 Hartford, Connecticut 06101 Facility.Name: .Haddam Neck-Inspection'At: Haddam-Neck Plant InspectionLConducted: August 31, - September 4, 1987 Inspector: ,, /0/r/B7'

. A. Vare a, . ead Re~ actor Engineer date App ~ roved.by: 7 myu N/J~/#7

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.~R. Str6' snider, Chief . date aterials and Processes Section, EB, DRS

. Inspection Summary: Inspection on August 31-September 4, 1987, Inspection  ;

Report No. 50-213/87-2 '

> - Areas Inspected: A routine unannounced inspection was conducted by a-region-based inspector. of- foundation design and construction activities for the new switchgear building (NSGB)' which when completed, will fulfill licensin commitments related to. compliance with 10 CFR 50 Appendix R. The inspection included -record review of the foundation ' design', observations of the support structure for base mat excavation and geotechnical stabilization of soils for adjacent structures. A review of license administrative controls and QA/QC activities also was performe Results: No. violations were identifie G f-I_ . _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ . _ _

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.1;0 Persons Contacted Northeast Utilities and Connecticut Yankee Power Company

~.* G. Bell, Nusco Generation Civil Engineer

• G.' T. Bohn, Nusco Gene-ation Construction

• Bouchard, Conn. Yankee Unit Superintendent  !

• Derrig, Conn. Yankee Engineer

• L'Heureux, Conn. Yankee Asst. Engineering Supvs .

• Nadequ, Conn. Yankee Manager Generation projects ,

• Miller, Conn. Yankee Station Superintendent '

• Paine, Nusco Quality Assurance

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B. Overbaugh, Nusco Project Manager, Swgr. Bld !

Bechtel Construction In i L. Anderson, Quality Control Engineer S. Brindis, Civil Engineer R. Cenzyszyn, Resident Engineer A. Early, Construction Superintendent R. Key, Subcontractor Engineer J. Kelley, Field Superintendent J. Nelson, Quality Control Manager C. T. Wang, Geotech Engineer, Gaithersburg L. Young, Geotech Engineer, Gaithersburg R. Joyce, V. S. Testing Laboratory Engineer T. Small, Commercial Batch Plant, Technical Director USNRC A. Asars, Resident Inspector J. T. Shedlowsky, Senior Resident Inspector l

• Attendees at exit meeting j 2.0 Inspection Purpose and Scope The purpose of this inspection was primarily to review with cognizant contractor and licensee engineers, responsible for engineering f requirements and quality assurance, construction of the new switch gear i building (NSGB). As identified in previous NRC resident inspector report j 50-213/87-18 the NSGB was moved a distance of 11.5 feet further north from the primary auxiliary building. This provides seismic integrity of I the primary auxiliary building (PAB) north wall should there be a seismic event during the preparation of the NSGB f~oundation and the construction l of the base mat. Construction of the prepared foundation was observed during this inspectio Records were reviewed of structural backfill replacement of unsatisfactory soils outside the north wall of PA8, the j I

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c 3 ja monitoring of ground acceleration during sheet pile driving for construction of the NSGS base mat and foundation stabilizat4n of adjacent structure Inspection was also performed of the following ongoing construction

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rebar installation and form work

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waterstop and waterproof membrane installation The inspector also performed a review of administrative controls and QA/QC activitie .0 Seismic Qualification of N.S.G.B. Foundation The NSGB foundation soils are qualified by a dynamic field program performed by Geotechnical Engineer Incorporated (GEI) and Bechtel. Borings and cross hole snear wave velocity measurements were conducted.in November 1986

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under an approved QA program. Where weak soils were encountered outside the north wall of the PAB (that resulted from unconsolidated backfill in the original construction), the seismic integrity of the PAB was ensured by moving the NSGB a distance of 11.5 feet further north, removing the loose backfill and replacing it with structural backfil The removal and control of structural backfill was conducted unrier the direction of Bechtel?s resident geotechnical engineer. His daily reports, during August, 1987, provide documentary evidence that all loose soils were removed, the subgrade was approved and approved. structural backfill was adequately compacted and tested.. Additional geotechnical control is represented in resident engineer sign'off of the " Work Plan'and Inspection Record" prior to the placement of the mud mat for'the NSGB base ma The licensee's administrative controls of Bechtel's Engineering, Procurement and Construction activities at Gaitersburg and at the jobsite are represented in Nusco QA Audit A-03515, performed between April 18 and May 13, 198 .The inspector evaluated the effectiveness -of this audi The significance at the 'jobsite of the audit findings of eleven open items are identified in NRC senior resident inspector report numbers 50-213/87-12 and 87-18, respectively between periods May 6 through June 9 and June 10 through July 14, 1987. During May construction work was stopped by the licensee on two l separate instances relating to the effects of the excavation and dewaterin No violations were identifie .0. Observation of Concrete Replacement Activities for the Switchgear Building Base Mat i

An inspection was performed of concrete replacement activities for the {

const'ruction of the NSGB's base mat. Ongoing craft activities for the installation of formwork, reinforcing steel, waterproof membrane and waterstop at the top of the basemat for the vertical wall construction joint were observed during the inspection:

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t- 1 4 Craft supervision, field engineer / survey controls and QC verification were observed to provide assurance the above activities met requirements identified in Bechtel drawings and specifications. Specifically, the installation of reinforcing steel for the basement was verified for the proper grade and certification of the steel, installed sizes, spacing, form clearance and secure tying. Evidence of craft training and material L control was observed to satisfy specifications C-351 and C-352 for the purchase and placing of reinforcing steel.

l 4.1 Qualification of Structural Concrete Ingredients and Proposed s Concrete Mix The inspector reviewed documentary evidence to qualify the snucturaC l concrete ingredients proposed for the NSGB. Bechtel's testing laboratory, l .U.S. Testing Company, reports were reviewed for conformance of the proposed concrete aggregates, water and admixtures. The requirements established by Bechtel's specification C-337, for the purchase of ready mixed concrete, were observed to qualify the concrete ingredient The proposed 4,000 psi ready mixed concrete furnished by cownercial supplier, Tilcon Tomasso In:. was tested and found acceptable. Bechtel

_ letter (BECY-87-045) to the licensee of July 27, 1987 presented evidence satisfying the specified requirements.

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4.2 Commercial Ready-Mixed Batch Plant Certi fication Bechtel's technical specification C-337 for purchase of ready mixed concrete requires the supplier of concrete for the NSGB to comply with the latest edition, revision or supplement of the American Concrete Institute (ACI) and ASTM standards referenced there i Specification C-337 specifically references the ACI 301 requirement that the concrete supplier batch plant and delivery fleet be certified to the National Ready Mixed Concrete Association Check List, (NRMCA).

The inspector observed in his visit to the commercial batch plant accompanied by licensee and Bechtel representative that the Plainville, Connecticut plant of Tilcon-Tomasso, Inc. had not been inspected for NRMCA certification. The inspector informed the licensee and Bechtel representatives that placing of concrete prior to certifying the Plainville batch plant would constitute a violation of the construction specificatio Bechtel responded to this finding by dispatching a registered professional engineer, specialist in concrete, to the batch plan The NRMCA check list was completed as requirid on September 4, 1987. The professional engineer and plant owner supplied information in the NRMCA check list and provided the requirements for conformance to the specification C-33 The batch plant was properly certified prior to placement of structural concrete for the NSG8 basemat on September 10, 198 No violations were identifie _ _ _ _ - - _ _ - _ _ _ _ _ _ _ . _ ._ - _ _ - - _ - - - _ _ _ _ _ . _ _ - __ - . . - - - - - - - - - - - -

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. , .. 5 5.0 Exit Meeting An exit meeting was conducted on September 4, 1987 by the NRC inspecto Attendees at the meting are listed in paragraph The NRC inspector

. summarized the inspection findings and the licensee acknowledged these findings. No written material was furnished to. licensee personne ,

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