ML20101G947

Provides Response to Telcon of 920527 Re Questions on Design for Sbo/Electrical Safeguards Upgrade Project

ML20101G947
Person / Time
Site:	Prairie Island
Issue date:	06/23/1992
From:	Parker T NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M68588, TAC-M68589, NUDOCS 9206290049
Download: ML20101G947 (4)

Text

o 4W Northem States Power Cornpany 414 Nicollet Mall

%nneapohs. Minnesota 55401 1927 Telephone (612) 330-5500 June 23, 1992 10 CPR Part 50 Section 50.63(c)(4)

U S No lear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50 282 License Nos. DPR-42 50 306 DPR-60 Reply to Questions on Design Report for the Station Blackout /Electt. cal Enfeguards Uncrade Ptgject (TAC Nos.#68588 andF68584) heferences: Letter from Thomas M Parker, Northern States Power Company, to U S Nuclear Regulatory Commission dated December 23, 1991 titled:

" Design Report for the Station Blackout / Electrical Safeguards Upgrade Project, Revision 1 (TAC Nos. 68588 and 68599)"

This letter is to provide documentation of a telephone conference of May 27, 1992 involving NSP personnel; Tad Marsh, Bill Long, Terrence Chan, and Mark Hartzman of NRR; and Bruce Jorgenson of Region III.

The referenced Design Report for the Station Blackout / Electrical Safeguards Upgrade Project (SB0/ESU) describes the implementation of ASME Section III requirements for the project piping systems. The description also notes the exceptions taken to ASME Section III requirements. The purpose for the conference call was to provide further information regarding those exceptions.

Specifically, we were asked to discuss the quality assurance program measures being utili::ed for the project piping systems.

Following is a written version of the verbal discussion provided in the conference call.

Ouality Assurance /Ouality Control Program Annlication on SB0 Pining Systems I. NSP Quality Assurance / Quality Control program for the $30/ESU project is based on the Prairic Island operational Quality Assurance Plan. The Operational Quality Assurance Plan invokes the direction provided by ANSI N45.2-1971, Quality Assurance Program Requirements for Nuclear Power Plants, and the ANSI N45.2 series of " daughter standards." The SB0/ESU project utilizes departmental and project procedures which implement the commitments of the Operational Quality Assurance Plan. A Corporate

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• 74orthem States Power Company USNRC June 23, 1992 Page 2 D!rective covers the application of_ASME Boiler and Pressure Vessel Code requirements, including Certified Design Specifications. Design Reports, Certified Mill Test Reports and Authorized Nuclear Inspection. To assure proper procedural implementation, NSP's Quality Assurance Department

, performs quality assurance audits and surveillances on project activities, including manufacturers and suppliers of ASME Code items.

II, Piping systems outside the diesel generator manufacturer's boundary are  !

designed, fabricated and installed in accordance with ASME Section III, with the exceptions noted in the project design report previously submitted to the NRC. The primary exception is the omission of the requirement for N Stamping of sub-assemblies and associated ASME Quality Assurance Program certification. To assure that the safety related piping and system components fulfill applicable technical, inspection and test requirements, including those of ASME Section III for Class 3 components, the following are performed. These accivities apply to the combustion l intake, exhaust and starting air s.ystems, and safety reinted sections of the fuel oil, lube oil and high temperature / low temperature cooling water systems.

a. Fluor Daniel, Inc. has been audited and approved to act as the Architect / Engineer for the SB0/ESU project.

b, Piping materials are procured per ASME Section 11, with NPT-Stamping of pipe and fittings fabricated with the addition of weld metal.

i This includes the supplying of certified material test reports and the application of inspections and tests prescribed by ASME Sections Il and III. The suppliers are t i NSP's Approved Vendors List for safety-related suppliers.

c. Other safety-related system components are controlled similarly to that above, including design and fabrication to ASME Section III (without stamping).

1. Tanks were supplied by Moorehead Tank Co. of Minnesota, who is on NSP's Approved Vendors List. NSP recently audited Moorehead, and Moorehead was required to customi:e cert ain program features for the SB0/ESU project. NSP has regularly had quality control inspectors at Moorehead during import nt program and process steps (design and procedure review / approval; material, welding and cleanliness inspection, etc.). In addition, Moorehead had

-contracted-the services of an Authorized Nuclear Inspector for t.hird party inspections of the SB0/ESU tanks. The tank design was analyzed in accordance with ASME Section III by Moorehead subcontractor AEC Engineers Inc. (an ~P approved supplier).

Further, the design and analysis was 1.-viewed and approved by Fluar Daniel, Inc.

USNRC Northern States Power Cornpany June 23, 1992 Page 3

2. Valves were manufactured by Velan, who Los been on NSl"s Approved Vendors List f or several years successively, overlappinb SBU/ESU project procuren.ont s Velan's quality assurance pro 6 ram had been audited recently (by Nuclear Utilities Procurement Issues Council) in August 1991.

d. Piping sub-assemblies were fabricated by facilities approved by NSP Quality Assurance as " verified vendors" or at the Prairie Island site. These facilities perf orm their f abrication ac t ivit ies under NSP's Prairie Island Quality Assurance Program, utilizing NSP procedures. Material and NDE inspections were performed by NSP resident Level II or III inspectors who were stationed at the facilities during sub assenbly fabrie w ion. NSP qualifies the welders in accordance with ASME Section D and lurnishes material testing services.

e. NSP has contracted an Authorized Nuclear Inspector from llartford Steam Boiler Inspection and Insurance Agency for performing inspections of piping systems at the fabrication facilities and p roj ec t site The Authorized Nuclear Inspector's verifications are essentially equivalent to those perf orwed on an N-Stamp projec t (ASME Section III, NCA 5220), with the exception ci ' hose relating to quality assurance (N. Stamp) program certification. According to a recent count by the Authorized Nuclear Inspector, he has visited the fabricators or project site 270 times and has reviewed over 200 certified mill test reports and 1700 weld control reco rds . The Authorized Nuclear Inspect or and NSP are developing a pro-forma ASME Data Report for certifying piping acceptability with respect to the ASME Code, as applied to the SB0/ESU proj ec t .

f.

Fluor Daniel, Inc. has issued design specifications for SB0/ESU piping, and in concert with NSP, will develop an ASME Coh Design Report. These documents will be consistent with ASME Section III, NCA-3000 requirements, following the guidance of Non-mandatory Appendixes B and C. The Cede Design Report will certify the successful analysis of the piping systems in accordance with the 198 f>

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' edition of ASME Section III (with the exception of utillaing ANSI B31.1 material allowablet for the exhaust piping) and reconcile any as-built variances from the design specifications.

g. In addition to the inspections and tests performed in accordance with ASM:' Sect ions 11 and Ill, hangers on piping 4 inch and over will receive visual pre-service inspection by certified inspection personnel to accommodate future ASME Section XI activities.

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• Northern States Power Company USNRC June 23, 1992

- Page 4 Please contact us if you have any questions related to this letter.

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[ A Thomas M Parker Manager Nuclear Support Services c: Regional Administrator Region III, f,'RC Senior Resident Inspector, NRC NRR Project Manager, NRC J E Silberg 1

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