ML19262A793

Responds to IE Bulletin 79-14,Revision 1,Suppl 2,re Seismic Analysis for Piping Sys.Piping Sys Design Specs & Procedures Listed.Walkdown Insp Checklist Encl

ML19262A793
Person / Time
Site:	Summer
Issue date:	10/30/1979
From:	Crews E SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-79-14, NUDOCS 7912110049
Download: ML19262A793 (5)

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October 30, 1979 Mr. James P. O'Reilly, Director U. 3. Nuclear Regulatory Commission Region II, Suite 1217 230 Peachtree Street, N. W.

Atlanta, GA 30303

Subject:

Virgil C. Summer Nuclear Station, Unit 1 Inspection and Enforcement Bulletin 79-14 Revision 1, Supplement 2 - Docket No. 50-395 Nuclear Engineering File: 2.8950

Dear Mr. O'Reilly:

NRC I & E Bulletin 79-14, Revision 1 and Supplement 2, regarding Seismic Analysis for As-Built Safety-Related Piping Systems required action by South Carolina Electric & Gas Company within 120 days. This letter provides information in response to this bulletin as it applies to the Virgil C. Summer Nuclear Station, Unit 1.

I. The following is a list of Piping system design specifications which provides the sources of input information for the pir>ing seismic analyses. These specifications include information required to perform piping anal)tical activities such as:

a. pipe sizes / weights

b. valve weights / center of gravity

c. load combinations

d. allowable stresses

e. interface requirements

f. seismic response spectra (reference specification)

SPEC. # TITLE ASME CODE 544AA Rev. 1 Chemical & Volume Control System Classes 2 & 3 544AB Chemical & Volume Control System Classes 2 & 3 544DA Residual Heat Removal System Piping Class 2 544FA Safety Injection System Classes 2 & 3 High Het.d Subsystem 1529 53 qq q g 7912110 O N

. Mr. James P. O'Reilly Page 2 October 30, 1979 SPEC. # TITLE ASME CODE 544EB Safety Injection System Class 2 Accumulator System 544BC Safety Injection System Class 2 Low Head Subsystem 544D Main Steam (Nuclear) Steam Piping Classes 2 & 3 544C Rev. 1 Emergency Feedwater System Piping Classes 2 & 3 544D Rev. 1 Feedwater System Piping Class 2 544E Steam Generator Blowdown Class 2 (Nuclear) System Piping 544H Rev. 2 Service Water System Piping Classes 2 & 3 5441 Component Cooling Water System Piping Classes 2 & 3 544J Rev. 1 Reactor Building Spray S;scem Classes 2 & 3 544K Spent Fuel Cooling System P_ ping Classes 2 & 3 W Rev. 4 General Piping Design Class 1 E-Sp. Specification, ANS Safety Class 1 G-677458 II. Using * - lesign drawings as a basis for fabrication, isometric draw!a; e e generated by our piping contractor and our piping fabrit. Lor for their respective scopes of responsibility.

These isometrics are used for fabrication and erection.

Through Work Procedures (WP), Quality Control Procedures (QCP) and specifications, these isometrics are verified to show the actual pipe geometry, shop and field welds, and hanger and valve locations.

Procedures are used to maintain control over work and to document all changes affecting the dimensions, locations, and installation of the piping, hangers, supports, valves and attachments.

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Mr. James P. O'Reilly Page 3 October 30, 1979 Procedures and specifications applicable to the fabrication and installation of safety grade piping systems are as follows:

TITLE QCP-VII-02 Fabrication and Installation Packet Inspection WP-VII-02 Preparation and Processing of fabrication and Installation Packets QCP-VII-03 Inspection of Piping Subassemblies WP-VII-03 Fabrication of Piping Subassemblies QCP-VII-07 Inspection of Fabrication and Installation of Hangers and Supports WP-VII-07 Fabrication and Installation of Hangers and Supports QCP-VII-09 Pipe Installation Inspection WP-VII-09 Installation of Piping GAI Spec. 220 Erection of Nuclear Piping GAI Spec. 544 Fabrication of Nuclear Piping GAI Spec. 545 Pipe Line Specification for Nuclear Safety Class Piping At the completion of the installation of a system, the document packet will contain all the isometric drawings corrected to as-built conditions, plus all the other required documentation.

III. The piping designer using his analysis isometrics for Class 2 and 3 pipe and the information received through approveu Field Change Requests and Non-Conformance Notices, will reconcile any changes to the as-built drawings. Representatives of the piping designer will then visit the site. During the visit, their scope of work will be to conduct an inspection walkdown of the completed system.

Class 1 piping systems are analyzed by Westinghouse Electric Corporation.

The as-built isometric drawings will be provided to them for re-analysis or reconciliation. Walkdowns will be performed in the same manner as Class 2 and 3 systems.

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t Mr. James P. O'Reilly Pag 3 4 October 30, 1979 We are including a list of the 15 inspection checkpoints used.

(See Attachment 1.)

These inspection checkpoints will be implemented in the physical walkdown of the piping system.

a. Pipe geometry (isometrics)

b. Supports, hangers, etc.: function, location and clearance

c. Attachments

d. Valve and valve operators: locations and weights.

Valve plus valve operator weights have been obtained from vendors' drawings and included in the Design Specifications. All valves are presently welded into the systems, so their actual weight is now impossible to obtain. We are contacting valve vendors and requesting verification of weights indicated on their certified drawings.

e. Embedments: please refer to our answer to IEB 79-02 dated July 5, 1979, and the additional response dated August 17, 1979.

The discrepancy list generated during walkdown, if any, will be dispositioned in the most expeditious manner and reconciled to the approved as-built isometric drawings.

There will be a final system walkdown and reconcilation of information after the first reanalysis is performed.

The areas of inspection will be the same as the original walkdown. At this time, there are practically no in-accessable systems.

Shouldyouhaveanyfurtherquestions!concrningthismatter, please contact us, ery ly yours, -

\

. . d'ws, or.

AGA:rm CC: Office of Inspection and Enforcement Washington, DC 1529 ;i56

ATTACHMENT 1 GAI SYSTEMS WALKDOWN INSPECTION CHECKLIST This walkdown checklist is to be applied to the above noted system. If a discrepancy is found in any of these areas, the number pertaining to it on the list below should be put in the notes / remarks column, along with a brief description, if necessary. This list is not intended to cover all support discrepancies, but rsther those areas which must be checked.

1. Is support type and function correct?

2. Is support location-orientation correct?

3. Is the support welded per design (size, location) relationship to fittings and val"es?

4. Are pipe support gaps acceptable?

5. Are there e ny damaged (bent, misaligned, etc.) parts?

6. Is there excessive corrosion?

7. Do deadload supports seem " LOADED"?

8. Will pipe movements be unrestricted?

9. Was erection tolerance violated (S. A. cn C , Hilti's, etc.)?

10. Are locking devices - nuts / bolts - present?

11. Are TV'L stops in spring hangers?

12. Are temporary supports remaining?

13. Center to center distances of Hilti Bolts on same plate and to adjacent supports (any kind) less than 10 diameter?

14. Does analysis ISO reflect as-built condition of pipe as shown on packet ISO's?

15. Orientation and location of valves and valve operators.

VERIFIER DATE VERIFIER DATE 1529 357