ML20148D984
| ML20148D984 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/18/1988 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-86-13, TXX-88078, NUDOCS 8801250533 | |
| Download: ML20148D984 (2) | |
Text
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~:""" E Log # TXX-88078 L
File # 10110 r
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1UELECTRIC
$I,0Sd41, January 18, 1988 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET N0. 50-445 JET IMPINGEMENT LOAD REVIEW SDAR: CP-86-13 (FINAL REPORT)
Gentlemen:
On March 5, 1987, we verbally notified your Mr. T. F. Westerman of a deficiency involving a computer entry error which could invalidate portions of the jet impingement load review for high energy line breaks (HELB).
This issue is applicable to Unit 1 only. Our latest interim report was logged TXX-6875, dated October 16, 1987.
Although our initial engineering evaluations indicate that this condition is not reportable, due to the extensive analysis required to support such a detennination and since the jet impingement loads are being recalculated as a result of the Systems Interaction Program (SIP) for HELB, we have conservatively elected to report this deficiency under the provisions of 10CFR50.55(e).
The required information follows.
Description Com3 uter program PIPSCIN was used to calculate the jet impingement loads from higi energy pipe breaks in Unit 1.
A design verification of the PIPSCIN program, was performed to address Technical Design Deficiency Report, TDDR DS-85-098. The verification subsequently identified an error in the input instructions which produced loads on some jet targets that were not conservative.
The cause of this condition has been determined to be an inadequate review of the computer input instructions.
Safety implications Failure of the high energy line break jet load analysis to meet required design criteria could result in an inability to attain and maintain a safe reactor shutdown condition during a HELB event.
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'8801250533 880118 PDR ADOCK 05000445 S.
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TXX-88078 January 18, 1988 Page 2 of 2 Corrective Action This issue is being resolved as part of the SIP Design Basis Consolidation Program for HELB.
For this program the jet impingement loads for Unit 1 are being recalculated utilizing the Ebasco JLOAD computer program.
Upon completion of the calculations, an analysis of the components impacted will be performed to determine if any plant modifications are necessary to meet the new jet impingement loads.
Other computer programs that were used for the HEL8 analyses are either validated or are replaced by validated new programs as part of the SIP.
Completion Date Modifications (if any) required as a result of our evaluation will be identified and scheduled for implementation in the. general construction schedule no later than August 11, 1988.
This is our final report on this issue.
Corrective action will be tracked and statused via 50AR 87-133, entitled "High Energy Line Break Analysis." Our final report for SDAR CP-87-133, logged TXX-88118, was suemitted on January 18, 1988.
Very truly yours, W. G. Counsil BSO/grr c - Mr. R. D. Martin, Region IV i
Resident inspectors, CPSES (3) l 1
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