ML20052C012
| ML20052C012 | |
| Person / Time | |
|---|---|
| Site: | 05000470 |
| Issue date: | 04/14/1982 |
| From: | Charemagne Grimes Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20052C013 | List: |
| References | |
| NUDOCS 8205040262 | |
| Download: ML20052C012 (4) | |
Text
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Docket No. STN 50-470 l
APPLICANT: Combustion Engineering, Inc.
1 FACILITY:
CESSAR Standard Nuclear Steam Supply System
SUBJECT:
SUMMARY
OF MARCH 19, 1982 MEETING ON CESSAR ENVIRONMENTAL QUALIFICATION On March 19, 1982, the staff met with representatives from Combustion Engineering j
(CE) in Bethesda, Maryland to discuss the application of a " thermal equivalence" technique and time margins of less than one hour for the environmental qualifi-cation of CESSAR equipment. The meeting attendees are iden'tified in Enclosure l
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and slides used during the. meeting are contained in Enclosure 2.
In support of CE's proposal to selectively apply a thermal equivalence tei:hnique and time. margins of less than one hour, CE submitted a sample environmental qual-ification test report by a letter dated March 3,1982. CE indicated that thermal equivalence and time margins"less than one hour would not be applied universally,. '
but would only be applied where judgement and experience 1.s suggest that the survivability o,f the equipment is questionable for the standard qualification procedure. CE clarified that the sample tes.t report was prepared for a subcom-
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- ponent, as an example and, therefore, some of the 'te'st data had to be synthesized to compile a complete report.
The staff expressed a concern that the thermal equivalence approach ~ may not be acceptable because the proposed Environmental Qualification Rule published in the FEDERAL REGISTER on January 20, 1982 restricts the use of analysis, in place of testing.
CE responded that this approach is only an extension of the contain-ment analysis that defines the test environment and that testing still serves as the basis for qualification.
l The thermal equivalence approach. consists of defining a surface temperature l
transient envelope for the equipment to be qualified using heat transfer co-efficients consistent with the. containment response analysis and conservative material properties. The test is then conducted such that the measured surface CE enumerated the con-temperature exceeds the' calculated surface temperature.
servatisms in the analytical m'odeling and concluded that the thermal equivalence The approach r'esults in an equivalent h' eat load on the equipment being tested.
staff expressed a concern that the selection of the limiting surface and con-sideration of synergistic effects had not been adequately considered.
In response, j
CE described an uncertainty analysis in which the limitations of the testing are
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l expressed in terms of a probability of failure and, through which, failure modes and effects can be considered.
CE pointed out that engineering judge-ment must be applied to select the appropriate test condition that will uncover failure modes.
CE also presented the uncertainty analysis ir support of time margins less than one hour, in r'esponse to a _ request from the staff.
Equipment that must function for much less than one hour following an event, and for which surviv-ability in a test environment for an hour or more is questionable, would be tested for a time that envelopes the maximum operability time and the uncertainty.
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The staff concluded that the approaches outlined by CE appear to be reasonable, with the understanding that the containment response tr'ansient environmental i
profiles will be reviewed on a plant-specific basis, these approaches would be applied on an equipment-specific basi's, and CE would have to supplement the
. program description-to include the analytical modeling and an e:iplanation of -
the method of application, incl.uding the selection of test parameters.- In addition, the staff identif.ied several preliminary restrictions regarding the application of the thermal equivalence approach which must be addressed in each ~
test report:
1.
Justification of the need for applying the approach; 2.
Justificati.on of the selection of the critical surface, with consider-ation of th,e ' temporal' changes and _ multipie surfaces; 3.
Multiple teq1perature measurements of the critical surfacefs.):._
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shall -envelope the calculated critical surface temperature transient (s),
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including the initial ramp such that " soaking" will not be permitted; and 4.
The margin between the minimum measured surface temperature and the calculated surface temperature shall exceed the uncertainty analysis l
cr a margin of 15 degrees by reference to the guideline of IEEE-323.
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Similar restrictions will be necessary for the application of time ma.rgins.
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less than one hour. The staff will review the uncertainty analysis and issue a formal position for both approaches, including a complete,Qist of restrictionsp.
l WGINAL SIGE:D Big.
C. I. Grimes, Project Manager Standardization and Special Projects Branch Division of Licensing cc:
D. Eisenhut R. Tedesco J. Miller 7
G. Bagcni
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OFFlCIAL RECORD _COPYd usceo ieei-3raco NRC FORM 318 0 0-80) NRCM oaa
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.-i MEETING
SUMMARY
-DISTRIBUTION t
. Docket File -
NRC POR Local POR TERA NSIC j
TIC j
SSPB Reading H. Denton/E. Case l
D. Eisenhut/R. Purple
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T..Novak I
R. Tedesco G. Lainas i
J. Knight W. Johnston i
D. Muller R. Mattson T. Speis L. Rubenstein W. Kreger 4
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j F. Schroeder M. Ernst i
Attorney, OELD Licensing Assistant OIE (3)
ACRS (10) i Region I Region II Region III Region IV Region V 1,
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Participants:
i C. Grimes P. Shemanski.
i J. Kennedy 4
K. I. Parczewski G. Bagchi J. Huang T. Le e-
o ENCLOSURE 1 1
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ATTENDEES March 19,1982 EQByjlCE NAME ORGANIZATION i
C. I. Grimes NRC/DL/SSPB P. Shemanski NRC/DE/EQB J. Kennedy NRC/EQB K. I. Parczewski NRC/DE/ CHEM G. Bagchi-NRC/EQB J. Huang NRC/CSB T. Le NRC/EQB
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R. A. Borgen EG&G E. R. Holloway EG&G M. Yost EG&G A. Dufresue CE(PE)
J. D. Kueck
-CE R. D. Cyroron CE P. S. Jackson CE R. E. Bryan CE W. G. Dove CE J. W. Civelb CE 3
me-..