ML20247E977
| ML20247E977 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 05/17/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CP-88-34, TXX-89259, NUDOCS 8905260387 | |
| Download: ML20247E977 (2) | |
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Log # TXX-89259
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1UELECTRIC Wuliam J. Cahul, Jr.
Executive Vice President U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET N05. 50-445 AND 50-446 RHR HEAT EXCHANGER SUPPORT DESIGN SDAR:
CP-88-34 (SUPPLEMENTAL REPORT - UNIT 1)
(INTERIM REPORT - UNIT 2)
Gentlemen-y' C
On October 6, 1988, TV Electric's report logged TXX-88724 notified the NRC of a reportable deficiency in the support configuration of the residual heat removal (RHR) heat exchangers.
Subsequent reports logged TXX-88834 and TXX-89064 were submitted on December 21, 1988, and February 24, 1989, respectively. The purpose of this report is to revise the status of the Unit 1 and Unit 2 corrective actions.
TXX-88834 stated that modifications to the Unit 1 RHR heat exchanger supports were complete.
These modifications were analyzed by Westinghouse with the conclusion that stresses in the vessel shell were acceptable.
Final reconciliation of the support stresses had not been completed at that time.
Reconciliation consisted of reviewin exchanger supports (at three levels)g the original design of the heat to ensure the support steel would carry the forces and moments calculated by the Westinghouse analysis.
Reconciliation of the support stresses for Unit 1 RHR heat exchanger supports is now complete and has identified the need for minor modifications in addition to those discussed in TXX-88834 (previously implemented via NCR 88-9142). These additional modifications affected the upper, lower and mid-level supports and have been implemented.
As modified, the supports match a fixed-end condition used in the Westinghouse analysis and provide allowance for thermal expansion of the RHR heat exchanger as calculated by Westinghouse.
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May 17, 1989 Page 2 of 2 The above design modifications have been implemented.
These actions resolve this issue for Unit 1.
The Unit 2 review and any required corrective action will be completed prior to Unit 2 fuel load.
The final report for Unit 2 will be submitted prior to Unit 2 fuel load.
Sincerely, 1
William J. Ca iill, Jr.
CBC/vid c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) l l
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