ML20215J667
| ML20215J667 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/04/1987 |
| From: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8705080191 | |
| Download: ML20215J667 (4) | |
Text
^LTIMOR BA E
GAS AND ELECTRIC CHARLES CENTER R O. BOX 1475 BALTIMORE, MARYLAND 21203 JOSEPH A.TIERNAN vice PntssoENT NUCLEAR ENERGY May 4, 1987 U.
S.
Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos. 1 & 2; Docket Nos. 50-317 & 50-318 Use of Mechanical Parts Purchased Commercial Quality in ASME Section XI Code Class 1,
2, and 3 Systems Gentlemen:
On Friday, May 1, 1987, we discussed our findings to date with Messrs. McNeil, Tripp, Foley, et. al.
One element of our plan to resolve the use of parts purchased commercial quality and installed in code systems is a sampling program for fasteners (studs, bolts, threaded rods, and nuts).
The sampling program plan is attached.
Although results are still preliminary, it appears that fasteners will make-up a majority of all parts involved.
Should the number of fasteners purchased commercial quality and installed in code systems be excessive, then we would consider this sampling program to reduce the work that would be required to ensure these commercial quality fasteners are suitable in code systems.
We may also use the in-situ tests described in " Equivalent Material Specifications" to justify leaving commercial quality fasteners installed in code systems instead of replacing them.
We will continue to keep you informed of the status of our investigation.
We will also notify you when, and if, we find it prudent to use the attached sampling program.
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-Docum:nt Control D32k May 4, 1987 Page 2 Should-you have any questions regarding the attachment or any other aspect of this issue, please feel free to contact us.
Very truly yours, 6h JAT/ WPM /dlm Attachment cc:
D. A. Brune, Esquire J.
E.
Silberg, Esquire W. T. Russell, NRC R. A.
Capra, NRC S.
A. McNeil, NRC T.
Foley/D. A. Trimble, NRC i
PROGRAM PLAN TO RESOLVE THE USE OF COMMERCIAL QUALITY FASTENERS IN ANSI B31.7 CLASS 1 AND 2 SYSTEMS AT CALVERT CLIFFS NUCLEAR POWER PLANT SCOPE
. Studs, bolts, threaded rod, and nuts (hereafter referred to as fasteners) purchased by BG&E as Commercial Quality but installed within the ASME Section XI Class 1,2, and 3 system boundaries.
OB3ECTIVES Ensure a representative sample (defined later) of fasteners in Class 1,2, and 3 systems purchased as Commercial Quality meet material specifications equivalent (defined later) to that provided in ASME Section XI.
DEFINITIONS Equivalent Material Specifications Acceptable results in the following tests.
Chemical composition will be determined using an x-ray flourescence analyzer, Model No. 840 manufactured by Columbia Scientific Industrial. The major alloy constituents will be determined and acceptance criteria will be in accordance with the applicable ASTM specification.
A hardness test will b performed in accordance with a BG&E Quality Assurance Program procedure with acceptance criteria based on the applicable ASTM specification.
An ultrasonic test will be performed in accordance with a BG&E Quality Assurance Program procedure with acceptance criteria based on the applicable ASTM specification.
A second examination in a lab may be required to differentiate between a false indication or in-service flaw and a manufacturing flaw.
Representative Sample The number of fasteners that must be tested (as described above) to provide a 95 percent confidence level that less than 5 percent of Commercial Quality fasteners installed on all Class 1, 2, and 3 systems do not meet equivalent material specifications.
The characteristics of each fastener will be assessed to ensure the representative sample is representative of the total population.
This sampling program is similar to IE Bulletin No. 79-02 (Revision 2), Appendix A,
. Sampling Method (b), with one exception. The Bulletin's sampling program was to be done on a system-by-system basis. We will sample over all Class 1, 2, and 3 systems because:
the suitability of fasteners purchased Commercial Quality in all Class 1,2, and 3 systems is at issue, and the source of Commercial Quality fasteners is identical for each system and class of system.
PROGRAM PLAN TO RESOLVE THE USE OF COMMERCIAL QUALITY FASTENERS IN ANSI B31.7 CLASS 1 AND 2 SYSTEMS AT CALVERT CLIFFS NUCLEAR POWER PLANT PROGRAM ELEMENTS (1)
Maintenance Orders (MOs) involving ASME Section XI Class 1,2, and 3 systems are reviewed to determine the nature of the work.
(2)
Those MOs that indicate a fastener was exchanged are reviewed in detail to determine the means by which that fastener was purchased.
(3)
If we determine a fastener was purchased Commerical Quality then it is identified as one member of the total population from which a representative sample will be tested. (If we cannot determine which fastener (s) within a bolt ring were replaced, then the entire bolt ring is assumed to be one member of the total population.)
(4)
A representative sample of the total population will be tested as described above in
" Equivalent Material Specifications." Members of the total population from Class 1 systems will be tested first. If necessary to obtain the representative sample, members of the total population from Class 2 and 3 systems will be tested.
(5)
All members of the total population that do not meet the equivalent material specification will be replaced with fasteners that meet the ASME Section XI requirements (Class 1, 2, or 3, as appropriate).
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