IR 05000271/1985032

Insp Rept 50-271/85-32 on 851007-11.No Violations Identified.Major Areas Inspected:Preservice Insp Plan for New Recirculation Sys Piping,Licensee Action on Previous Insp Findings & Recirculation/Rhr Piping Replacement

ML20136B548
Person / Time
Site:	Vermont Yankee
Issue date:	11/06/1985
From:	Mcbrearty R, Wiggins J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
Shared Package
ML20136B545	List: IR 05000271/1985032 ML20136B541
References
50-271-85-32, NUDOCS 8511200234
Download: ML20136B548 (6)

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U.S. NUCLEAR REGULATORY COMMISSION

REGION I

Report No. 50-271/85-32 Docket N License No. DPR-28 Priority -

Category C

Licensee: Vermont Yankee Nuclear Power Corporation RD 5, Box 169 Ferry Road

"cattleboro, Vermont

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05301 Facility Name: Vermont Yankee Nuclear Power Station Inspection At: Vernon, Vermont Inspection Conducted: October 7 - 11, 1985 Inspectors: N80- lW kW. &, /4W R.A.McBrearty,ReactoQngineer datb Approved by: St/N J. T. Wiggins, Chief (/

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date Materials & Processes Section, EB, DRS Inspection Summary: Inspection on October 7-11, 1985 (Report No. 50-271/85-32)

Areas Inspected: Routine, unannounced inspection of preservice inspection plan for new recirculation system piping; licensee action on previous inspection findings; and Recirc/RHR piping replacement including vendor QA records, NDE procedures and data, procurement specification, material certification records and receipt inspection. The inspection involved 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> onsite by one regional-based inspecto Results: No violations were identifie g. o= o e5,, g ,i 8511200234

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DETAILS 1.0 Persons Contacted Vermont Yankee Nuclear Power Corporation J. Gianfrancesco, Construction Supervisor

• D. Girroir, Senior Quality Assurance Engineer

• R. Laprione, Maintenance Supervisor

• Metell, Acting Engineering Support Supervisor

• J. Pelletier, Plant Manager

• D. Phillips, Senior Electrical Engineer

• D. Reid, Operations Superintendent Yankee Atomic Electric Company J. Hoffman, Engineering Supervisor - Recirculation Piping Replacement

• L. Mullins, ISI Coordinator A. Small, Engineer Morrison - Knudsen Company J. Gilles, Quality Control Supervisor J. Hairston, Project Quality Manager General Electric Company

• Neal, Technical Services Representative U.S. Nuclear Regulatory Commission W. J. Collins, IE - telephone contact W. Hazelton, NRR - telephone contact

• Raymond, Senior Resident Inspector

• T. Silko, Resident Inspector

• Denotes those present at the exit meetin . Licensee Action on Previous Inspection findings (Closed) Unresolved Item (271/83-02-08): Ultrasonic detectability of artificial defects (notches) in feedwater nozzle mock-up. The item was based on a mock-up containing notches which did not extend through the cladding into the base material. The licensee has fabricated his own mock-up which contains a series of notches which do extend into the base material through the cladding. The mock-up is used to train and qualify technicians who will participate in the ultrasonic examination of the feedwater nozzles at Vermont Yankee. The inspector reviewed POE data and documentation which indicated that the notches in the mock-up were detected during the ultrasonic procedure qualification demonstration on

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September 23 ard 24, 1985. Additionally, the inspector visually examined the mock-up and verified that the notches extend into base materia Based on the above, this item is considered close (Closed) Unresolved Items (271/83-07-01) and (271/84-13-01) and Inspector Follow Item (271/84-08-10): The items are related to intergranular stress corrosion cracking of the recirculation system piping at Vermont Yanke During the current refueling outage the system piping will be replaced with conforming material and Induction Heating Stress Improvement (IHSI)

will be performed on welds in the syste The licensee's actions regarding piping replacement and the performance of IHSI remove the basis for the above items and, therefore, the items are considered close . Preservice Inspection (PSI) Plan The inspector reviewed the licensee's plan for preservice inspection of the new recirculation system piping at Vermont Yankee. The plan was reviewed with respect to ASME Section XI requirements and regulatory requirement The inspector found that the plan lists all the items which are required to be examined, and is categorized as follows:

• Piping Welds

• Pumps and Valves

• Support Components

Small Bore Piping

• Hydrostatic Test Boundaries The plan was found to contain information regarding the required examina-tions (volumetric, surface and visual), acceptance criteria and personnel qualification requirements. The licensee had questions regarding ultra-sonic examination personnel re qualification for the detection and sizing of IGSCC. The inspector's inquiries to NRR and IE Headquarters indicated that personnel involved with the baseline ultrasonic examination of the

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new piping welds at Vermont Yankee would not be required to re qualify prior to performing the examinations. The licensee was advised of this at the exit meeting on October 11, 1985.

No vinlations were identifie . Ultrasonic Examination of New Piping The licensee plans to perform baseline altrasonic examination of the new piping welds using the fully automatr:d P-Scan system, and additionally in selected cases, by conventional manual techniques. Two vendors, International Testing Laboratories and Magnaflux Corporation, have been contracted by the licensee to perform the required examination I

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Additionally, Magnaflux Corporation personnel will perform routine inser-vice examinations during the current outag The inspector reviewed the following ultrasonic examination procedures which will govern the automatic P-Scan examinations at the plant:

• Procedure No. ITL-UT-A-4, Document No. ITL-T-1-7, " Automated Preser-vice and Inservice Ultrasonic Examination of Austenitic Piping Welds."

• Procedure No. ITL-UT-A-5, Document No. ITL-T-1-6, " Automatic Ultra-sonic Examination Procedure for the Discrimination of Indications by the 30-70-70 Mode Conversion Method Fully Automatic."

Previous examinations of the Vermont Yankee recirculation system piping welds have been performed with the P-Scan equipment. Baseline data will be recorded over the entire dynamic range (127 dB) of the equipmen Examination personnel have been qualified with the P-Scan equipment at the EPRI NDE Center at Charlotte, North Carolin The inspector found that the ten N2 nozzle inconel safe ends and the two N5 nozzle inconel safe ends will be replaced with type 316 stainless steel safe enas. The removal of the existing safe ends will leave the original weld in place to preclude cutting into the nozzle base metal. The final configuration will include the original weld, the new weld and corrosion resistant claddin The licensee recognizes that this geometry may prove difficult to examine ultrasonically and is investigating examination techniques and equipment to minimize the anticipated problem No violations were identifie . Reactor Recirculation System / Residual Heat Removal System piping Replacement The inspector reviewed documentation and QA records related to replacement of the recirculation and RHR systems at Vermont Yankee. The review was done to ascertain that regulatory and code requirements were met and that adequate controls were established for the removal of the existing piping and installation of the new piping. The following were included in the inspector's review:

Procedure FQP-7.1, Revision 0, " Receipt Inspection"

"Morrison Knudsen Management Plan for the Recirculation Pipe Outage"

Engineering Design Change Request (EDCR) No. 85-01, " Recirculation /

RHR Piping Replacement"

Specification VY-EDCR 85-1 S1, "Specif kation for Procurement of Nuclear Grade Stainless Steel Piping for Replacement of Vermont Yankee Nuclear Power Statioi Recirculation System"

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Specification VY-EDCR 85-1 S3, " Specification for Installation of Replacement Recirculation and RHR Systems at Vermont Yankee Nuclear Power Station" The piping replacement is being done because of cracking found in the heat affected zones of several welds in recirculation and residual heat removal systems during the 1983 and 1984 refueling outages. The piping replace-ment is being done by Morrison-Knudsen Company personne The above listed documents were found to contain fabrication and installa-tion requirements including welding, inspection, examination and test requirements. Section 8 of EDCR 85-1 S3 describes the quality assurance requirements for t.he project. Section 15 of EDCR 85-1 provides the licensee's safety evaluation in which technical justification is provided to support the conclusion that an unreviewed safety question does not exis In addition to the above the inspector observed work in progress which included the receipt inspection of spool piece RHR 32-1, and reviewed vendor records and NDE procedures to ascertain that applicable procurement and code requirements were met. Records associated with the following were included in the inspector's review:

• Spool piece RHR 32-1

• Spool piece RHR 30-2-1

Deviation Disposition Request (DDR) No. VY-DDR-0001 thru -0008, inclusive The records, which included material test certificates, heat treatment records, nondestructive examination records and dimensional measurements, verified that the delivered material complied with the procurement requirements and that the applicable NDE requirements were me The receipt inspection of spool piece RHR 32-1 was done by Morrison-Knudsen Company personnel and included verification of dimensions shown on the applicable drawin The inspector found that the deviation disposition requests were clearly documented by Hitachi Ltd., and were properly evaluated and dispositioned by the license No violations were identifie . QA/QC Interfaces with Pipe Replacement Activities

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The inspector observed in progress activities, interviewed licensee per-sonnel and reviewed documentation to ascertain that the licensee's QA/QC coverage was adequate to provide assurance that applicable requirements were met. The inspector found that the Bechtel Corporation was contracted to represent the licensee and to provide QA coverage at Hitachi, Ltd. in Japa The inspector observed licensee and Morrison .Knudsen QA personnel

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participating in receipt inspection of the replacement piping, and observed a representative of the Yankee organization QA group performing a l', review of replacement piping fabrication records.

No violations were identified, a

7. Exit Interview

The inspector met with licensee representatives denoted in paragraphs 1 at

the conclusion of the inspection on October 11, 1985. The inspector summarized the purpose and the scope of the inspection and the finding , At no time during this inspection was written material provided by the

! inspector to the licensee.

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