ML20207Q599
| ML20207Q599 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/21/1987 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8701280313 | |
| Download: ML20207Q599 (3) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place TAN 21887 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Office of Nuclear Reactor Regulation Washington, D.C.
20555 Attention:
Dr. J. Nelson Grace In.the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NL' CLEAR PLANT UNIT 2 - LONG-TERM DRAWING CONTROL PROGRAM
References:
(1) Letter from G. G. Zech to S. A. White dated November 10, 1986, " Meeting Susanary" (2) My letter-to you dated December 12, 1986, " Restart Program for Drawing Update"
. Reference 1 documented TVA and NRC agreement during a meeting on October 23, 1986, that TVA would provide information concerning the drawing update program. Reference 2 provided the program for drawing update required for restart. The following information describes the long-term program which TVA is putting in place to improve the quality, accuracy, snd timeliness of update of the drawings for Sequoyah Nuclear Plant. This new design change process will also ensure that the actual configuration of the plant is accurately reflected in.the drawings and that the configuration is supported by the design basis.
Sequoyah's new design change control system will utilize a single set of configuration drawings which will function as both the as-configured and
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as-designed base of the plant. Proposed modifications will be issued as approved and controlled, unitized Plant Modification Packages which will
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-totally define a specific, executable scope of work and including drawings, installation specifications, work plans, and inspection requirements. The i
design and actual configuration of the plant will be represented by the Configuration Control Drawings (CCDs). Any outstanding design changes will be shown on Design Change Authorizations (DCAs). Requirements and controls will l
be added to ensure that all phases of a specific unit of work are completed and that, ofter the modification is completed in the field, the CCDs are updated to reflect the actual plant configuration. These changes will be red-lined on the Control Room Drawings before system operability. A target of 15 days from completion of workplan to update of primary drawings has been established.
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. U.S. Nuclear Regulatory Commission EhlN21shB7 All other drawings will be updated within 90 days of completion of workplan.
As part of the Design Baseline and Verification Program, walkdowns are being made to verify the functional configuration of the plant and to be sure that the functional configuration is properly reflected on the CCDs. Any future differences between the actual plant configuration and the drawings which are found will be corrected through the drawing deviation program.
To further enhance TVA's drawing control system, the Drawing Management System (DMS) is being revised and improved so that it can be used as the drawing configuration database and track the status of Engineering Change Notice (ECNs), CCDs, DCAs, etc.
The computerized DNS database will be available to personnel for. reference and to quickly determine the exact status of any CCDs, DCAs, etc. This will enable those doing maintainance, for example, to quickly ascertain the current configuration and. review any needed documents before beginning any work.
TVA has further improved its drawing control by placing the responsibility for the drawing program with a single organization, the Division of Nuclear Engineering (DNE). This responsibility includes engineering and design, issuing ECM modification packages, resolution of drawing discrepancies affecting plant configuration, and incorporating as-installed modifications on the CCDs. This will eliminate many of the past problems which resulted from maintaining two sets of drawings which reflected only the as-constructed and as-designed status respectively.
It will also ensure that any proposed modifications to the plant are properly reviewed and approved before any changes to the plant configuration are reflected on the CCDs and are supported by the proper design basis, program adherence will also be enhanced through accurate and controlled lists of drawings which are required to operate, maintain, and control the design integrity of Sequoyah, as well as the drawings to be maintained in the Emergency Control Center. TVA will maintain a complete listing of these sets of drawings which will be coordinated with affected groups.
As stated previously, the upgrade program required to bring the primary set of control room drawings to the acceptable level required for restart is defined in reference 2.
However, to further improve the quality and readability of the primary Control Room drawings. TVA is using a Computer Assisted Design (CAD) process to develop and revise these drawings. This will allow both a high-quality final product as well as reducing the time required to incorporate changes.
Some of the primary Control Room drawings have already been upgraded utilizing Computer Assisted Drafting (CAD), and the remaining primary drawings will be upgraded by this process as they are converted to CCDs.
9 A U.S. Nuclear Regulatory Commission
! TAN 211387 Procedures have been issued to initiate the new design control process. The implementation of these procedures are being phased into the change control process. Additional changes to make refinements to the process are planned.
Implementation of the additional changes will begin in July 1987 and will continue until all refinements have been defined. Upon completion of these refinements, the " transitional" period will be over, and the " permanent" design control process will be in place.
This implementation program will provide for expeditious upgrade of Sequoyah drawings on a priority basis as they are needed for operation, maintenance, and design.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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f.Gridley, Director Nuclear Safety and Licensing cc:
Mr. J. J. Holonich Sequoyah Project Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Mr. B. J. Youngblood U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Mr. G. G. Zech, Director TVA Projects U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant P.O. Box 2000 Soddy Daisy, Tennessee 37319
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