United States Nuclear Regulatory Commission - Protecting People and the Environment

Inservice Inspection Programs for Prestressed Concrete Containment Structures (Generic Letter 80-101)


                              UNITED STATES 
                          WASHINGTON, D.C. 20555 

                             November 25, 1980 



SUBJECT: Inservice Inspection Programs for Prestressed Concrete Containment 

The Office of Standards Development is in the process of awarding a contract
to Oak Ridge National Laboratories to compile and review the containment 
inservice inspection (ISI) records of all operating nuclear power plants 
with greased prestressing tendons. The purpose of this contract is to assess 
the data accumulated to date on the ISI of greased tendons in containments, 
and to determine the effectiveness of these programs. 

The contractor will review Regulatory Guides 1.35 and 1.35.1 and the 
relevant draft of the ASME Section XI Working Group on ISI of Concrete 
Pressure Components. In addition, the contractor is being asked to visit a 
few sites to observe the ISI of greased prestressing tendons. The contractor 
will then be asked to make recommendations to improve the existing programs.

With this letter, we are requesting voluntary submissions of existing data, 
summaries and records of the ISI tests of containments with greased pre-
stressing tendons, which should contain the following information: 

a.   Sample size and method of sample selection, 

b.   Procedure for lift-off testing, 

c.   Procedure for testing of corrosion inhibiter (i.e., grease), 

d.   Procedure for tendon material testing, 

e.   Acceptance and rejection criteria used for the test program, and 

f.   Repair, replacement and corrective actions. 

Information already reported to the NRC need not be included. We also 
welcome any comments, observations or suggestions you may consider relevant 
to this effort. In your response please indicate any ISI tests planned 
between December 1980 and June 1981 that our contractor could observe. 

                                  - 2 -                 November 25, 1980 

The above information should be sent to, Chief, Structures and Components 
Standards Branch, Office of Standards Development, U.S. Nuclear Regulatory 
Commission, Washington. D.C. 20555 by December 31, 1980. For further 
information concerning this project, contact Hans Ashar at (301) 443-5997. 


                                   Darrell G. Eisenhut, Director  
                                   Division of Licensing  
                                   Office of Nuclear Reactor Regulation 

List of plants with Prestressed Concrete Containment Structures


1.  Arkansas Nuclear 1                       Arkansas Power & Light Co. 

2.  Calvert Cliffs 1 & 2                     Baltimore Gas & Electric 

3.  Fort Calhoun 1                           Omaha Public Power District 

4.  Ginna N.P.S.                             Rochester Gas & Electric 

5.  Millstone N.P. 2                         Connecticut Light & Power Co. 

6.  Oconee N.S. 1, 2 & 3                     Duke Power Company 

7.  Palisades                                Consumers Power Company 

8.  Point Beach 1 & 2                        Wisconsin Electric & Power 
                                             Wisconsin & Michigan Power 

9.  Rancho Seco 1                            Sacramento Municipal Utility 

10. Robinson. H.B. 2                         Carolina Power & Light 

11. Trojan Nuclear Plant                     Portland General Electric 

12. Turkey Point 3 & 4                       Florida Power & Light 

13. Zion Station 1 & 2                       Commonwealth Edison Company 

14. Crystal River 3                          Florida Power Company 

15. J. M. Farley N. P. 1 & 2                 Alabama Power Company 

Page Last Reviewed/Updated Tuesday, September 01, 2015