ML20246P107
| ML20246P107 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/12/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8905220085 | |
| Download: ML20246P107 (3) | |
Text
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4 6 g TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. TENNESSEE 37401 SN 1578 Lookout Place U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Hashington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 AND 2 - DESIGN CONTROL PROGRAM
Reference:
TVA letter to NRC dated January 21, 1987, "Sequoyah Nuclear Plant Unit 2 - Long-Term Drawing Control Program" In the referenced letter, TVA described the permanent design control process including implementation details.
TVA has made changes to this process and will continue to refine and enhance the design control process to ensure operational needs are met by providing accurate, quality, and timely updates of plant and design documents.
This letter provides a status update and description of process changes that have been made relative to aspects previously described in the referenced letter.
TVA stated that refinements in the permanent design control process were planned and that, upon implementation of these refinements, the transitional design control process would be over and the permanent design control process would be in place.
Implementation of the permanent design control process began on March 31, 1988.
The transitional design control system will continue to be used for work initiated under this program until all of that work is complete.
In describing the permanent design control process, TVA stated that " proposed modifications will be issued as approved and controlled, unitized Plant Modification Packages which will totally define a specific, executable scope of work and including drawings, installation specifications, work plans, and inspection requirements." Currently, TVA uses two processes to make modifications to the plant.
Both processes contain the requirements as outlined in the SQN Nuclear Performance Plan,Section II.3.3.2, " Permanent Design Control System." Minor modifications are processed using the design change notice (DCN) package, and all other modifications are processed using the plant modification package (PMP) process. A minor modification is a modification that has a negligible effect on plant function, is of limited scope, and requires little or no engineering evaluation or analysis to justify the change. Minor modifications account for the majority of the modifications to the plant. Workplans are not normally included in the design change document but are standalone documents that implement and reference the design change.
Also, the permanent program was to include a revised and improved drawing management system (DMS).
The DMS was to be used in the permanent design control program as the drawing configuration data base and track the status of 8905220085 890512 PDR ADOCK 05000327 P
PDC no---%g
i U.S. Nuclear Regulatory Commission l
MAY 121989 engineering change notices (ECNs) and drawing changes, configuration control l
drawings (CCDs), and design change authorizations (DCAs).
Alternatively, TVA l
developed two new systems in addition a continuing to maintain the DMS.
DMS l
will continue to be maintained to track unimplemented design changes issued under the old design control process.
The design change document tracking system was developed to track the status of individual ECNs/DCNs/PMPs issued under the interim and permanent design control processes.
The DCA pilot system was developed te crack the status of CCDs and DCAs.
These two new systems provided the control that the revised and improved DMS was to provide.
As a further progren enhancement, TVA was to generate accurate and controlled lists of drawings that are required to operate, maintain, and control the design integrity of SQN.
Presently, TVA maintains a list of primary control room, category 1, drawings, which depict system features that are used for plant operations.
The plant Technical Support Center and the Emergency Operations Facility utilize the primary drawings to determine system operation and function in the event of a radiological emergency.
Category 2 drawings are safety-related drawings principally used to support detailed design changes, maintenance, and modifications to the plant.
Category 2 drawings have been identified and are maintained in the DMS. Category 3 drawings are non-safety-related drawings that may be necessary to support plant maintenance or modifications or those drawings that TVA chooses to maintain in the current configuration for convenience. Category 4 drawings include all other drawings not included above.
These drawings are used to provide documentation of nonessential features, such as structure locations, or to support other design drawings.
Because category 3 and 4 drawings are updated in accordance with SQN's drawing program, maintaining lists of these drawings is not essential.
Considerable progress has been made in implementing the permanent design control process.
TVA's commitment to refine and implement additional changes to the new design control process is considered complete even though specific details may change and further refinements may be required during program evaluation.
Such changes and refinements will continue based on lessons learned from implementation and on plant operational needs to ensure that the SQN design control process provides quality, accurate, and timely updates of plant design documents.
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i If you have any questions concerning this submittal, please telephone M. T. Ccoser at (615) 843-6549.
Very truly yours, TENNESSEE VALLEY AUTHORITY 1
rx Manager, Nuclear Lic nsing and Regulatory Affairs 1
cc:
See page 3 l
1 i
s U.S. Nuclear Regulatory Commission IAlXf 121989 cc: Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission l
Region II 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 l
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