ML18081A448
| ML18081A448 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 10/05/1979 |
| From: | Martin T Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7910310262 | |
| Download: ML18081A448 (5) | |
Text
Thomas J. Martin Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430-8316 Engineering and Construction October 5, 1979 Mr. Boyce H. Grier, Director U. S. Nuclear Regulatory Com.mission Office of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Grier:
NRC IE BULLETIN NO. 79-02 SUPPLEMENTAL RESPONSE NO. 2 UNIT SALEM GENERATING STATION Pursuant to our initial response dated July 6, 1979 and telecon of September 12, 1979 on the subject bulletin, the attached supplemental response is submitted for your review.
If you require any further information regarding the attached report, we will be pleased to discuss it with you.
Very truly yours, Attachment CC:
NRC Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D.C.
20555 L. J. Norrholm NRC, Hancocks Bridge, NJ
- e.
NRC IE BULLETIN *79-02 RESPONSE SUPPLEMENT II UNIT NO. 2 SALEM NUCLEAR GENERATING STATION The following is a test program outline for testing and examination of anchor bolt installation in safety related piping systems.
I.
EMBEDMENT VERIFICATION A.
Scope
- Accessible Seismic Class I pipe support bolts employing wedge type concrete anchors, shall be examined to determine embedment length within the concrete.
Piping systems included in the scope of this program are as follows:
- 1.
- 2.
- 3.
Safety Injection
- 4.
Steam Generator Feed
- 5.
Component Cooling
- 6.
Nuclear
- 7.
- 8.
- 9.
- 10.
Chilled Water
- 11.
Chemical & Volume Control
- 12.
Control Air - Safety Related
- 13.
Diesel Generators Starting Air & Fuel
- 14.
Steam Generator Drains and Blow Down
- 15.
Spent Fuel Cooling B.
Procedure
- 1.
Effective length of installed bolting is determined by means of ultrasonic testing utilizing equipment which is calibrated against bolts of the type utilized in the plant.
- 2.
Embedment length is determined by subtracting the measured portion of the bolting extending out of the concrete surface from the total effective bolt length as measured ultrasonically.
I,
I
- 3.
Measured embedment lengths are compared against embedment required for design load.
- 4.
Corrective actions, if any, required as a result of embedment verification are implemented by means of documented engineering change notices.
C.
Schedule Completion of the embedment examination aspect 0£ installation verification together with required corrective actions has been accomplished.
II.
ANCHOR BOLT WEDGE SETTING PROGRAM A.
Scope Seiqmic Class I Systems defined in Section I.A above shall have bolting randomly sampled on a system by system basis to determine the adequacy of anchor wedge setting during original installation.
Such sampling shall be of sufficient quantity to provide 95% confidence that less than 5% improperly set anchors are installed in any of the specified safety related systems.
B.
Procedure
- 1.
The original position of a given load bearing nut in the sample bolt is marked to establish the nas installedn position.
- 2.
The nut is loosened a sufficie~t amount as necessary to visually confirm that there is no termination of bolt thread at or outside the interface between the nut and the support steel outer surface.
Nut loosening is also done to verify freedom from any bolt and nut thread binding due to paint, debris or thread damage.
- 3.
The nut is returned to its original position and then tightening is attempted.
Acceptance of the sample is based on the amount of turning, if any, it takes to bring the nut to the proper level of tightening (approximately one turn being established as the max tolerance)..
- c.
Schedule If in performing sample wedge set testing on a given system, the specified confidence as to proper wedge setting is not confirmed, sufficient additional bolting will be tested with appropriate corrective action to provide for required minimum factor of safety specified in Bulletin 79-02.
This testing shall be completed prior to Mode 2 operation.
III. LOAD TEST VERIFICATION A.
Scope The test and examination programs discussed in
.Items I & II above are considered adequate to justify installation verification aspects of pipe support anchor bolts.
In certain instances, however, bolt design calls for threaded rod and coupling extensions on anchor bolts which are embedded in poured concrete piers.
Such installations which occur primarily where base plates are used, preclude UT or any other known non-destructive embedment verification method.
Also, methods for verifying anchor wedge set are precluded because the wedge setting mechanism, i.eo threaded rod coupling, is embedded in concrete.
To provide confidence that such designs are in fact adequate, a test program for loading these supports has been established on a sample basis.
B.
Program Procedure
- 1.
applied plate.
load.
By means of hydraulic jacks, a test load is on the pipe support attachment to the base This load is a function of the design piping
- 2.
Acceptance criteria of the support is established on the.basis of measured elongation of the bolt under test load. *
- c.
Schedule Base plate bolt load testing together with corrective actions, if any, required from the testing shall be complete prior to fuel loading.
9Ll 18/21