TXX-6362, Interim Deficiency Rept CP-86-12 Re Attachments At/Or in Close Proximity to Design Gaps Between Secondary & Adjacent Walls.Initially Reported on 860227.Evaluation of Commodities in Progress.Next Rept Will Be Submitted by 870603
| ML20205J748 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/27/1987 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CP-86-12, TXX-6362, NUDOCS 8704010403 | |
| Download: ML20205J748 (3) | |
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Log # TXX-6362 l-9 File #10110
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903.7 r
C Ref# 10CFR50.55(e) 1UELECTRIC March 27, 1987 1.m uske i k e freukne U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 I
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 COMMODITY INSTALLATIONS AT SECONDARY WALL DESIGN GAPS SDAR: CP-86-12 (INTERIM REPORT)
Gentlemen:
1 On February 27, 1986, we verbally notified your Mr. T. Westerman of a j
deficiency involving attachments at, or in close proximity to, design gaps between secondary walls and adjacent walls / floors. This is an interim report of a potentially reportable item under the provision of 10CFR50.55(e). Our last interim report was logged TXX-6234, dated January 21, 1986.
The methodology for evaluation of comodities attached to, or in close proximity to, adjacent structures or walls has been developed.
Specifically, wall displacements are to be determined during a seismic event and compared to allowable commodity movements for acceptability.
Currently, a Design Base Document (DBD CS-19) is being developed to define these maximum wall displacements.
Evaluation of the commodities bridging gaps between secondary walls and adjacent structures is scheduled to be completed by the end of May,1987 for Unit I and common areas. Unit 2 will be scheduled after the completion of Unit 1.
A Commodity Clearance Program is being developed for commodities installed in close proximity, but not attached to, secondary walls. The program will establish a matrix of displacements for all commodities and associated structural elements including secondary walls. Maximum displacements will be based on the above DBD CS-19. The maximum movement matrix will be utilized through a multi discipline walkdown for as-built clearance acceptability. A definitive completion schedule will be submitted with our next report.
During evaluation of the issue, we have additionally discovered that secondary wall designs did not consider commodity support loadings.
Therefore, our evaluation effort has been expanded to include the methodology for determining the structural adequacy of these walls.
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TXX-6362 March 27, 1987 Page 2 Following a full analysis of these issues, an evaluation will be made regarding the effects on the safety of plant operations had these conditions gone uncorrected.
We will submit our next report by June 3, 1987.
Very truly yours, W. G. Counsil JCH/ef c - Mr. E. H. Johnson, Region IV I
Mr. D. L. Kelley, RI - Region IV Mr. H. S. Phillips, RI - Region IV i
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1 w-+
o Outgoing Correspondence bec (3):
M. D. Spence
- INP0
- K. L. Scheppele A
W. G. Counsil R. T. Jenkins H. C. Schmidt J. W. Beck R. A. Jones A. B. Scott R. P. Baker S. D. Karpyak B. C. Scott
- R. E. Ballard G. S. Keeley/
C. E. Scott E. Brabazon J. S. Marshall
- L. K. Sterchi J. L. Barker
- R. P. Klause P. B. Stevens
- W. R. Burchette J. E. Krechting J. F. Streeter
- J. H. Butts J. C. Kuykendall
- 8. Tartt R. D. Calder
- D. F. Landers
- J. L. Vota F. Camp
- R. P. Lessey
- E. L. Wagoner R. E. Camp
- 0. W. Lowe H. M. Warren (2)
- R. L. Cloud D. M. McAfee/
- N. H. Williams J. R. Ccambe P. E. Halstead D. R. Woodlan D. E. Deviney
- R. E. McCaskill R. A. Wooldridge
- L. Dietrich
- J. P. McGaughy
- T. G. Dignan D. D. Mosley
- J. Ellis
- A. Muzzin W. D. Fenoglio L. D. Nace
- B. Finkelstein PIMS J. C. Finneran L. E. Powell
- J. Garibaldi R. L. Ramsey J. B. George J. D. Redding R. L. Grubb D. M. Reynerson H. A. Harrison
- N. S. Reynolds J. C. Hicks March 2, 1987
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