ML20147E522
| ML20147E522 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/11/1988 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-79, TXX-88062, NUDOCS 8801210144 | |
| Download: ML20147E522 (2) | |
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Log # TXX-88062 Fi1e # 10110
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908.3 Ref. # 10CFR50.55(e)
If,*1SJ",i, January 11, 1988 U. S. Nuclear Regulatory Commission 4
Attn: Document Control Desk Washington, n.C.
20555 SUDJECT:
COMANCHE PEAK STEAM ELECTRIC STATION DOCKET NOS. 50-445 AND 50-446 CABLE AND RACEWAY DATA SYSTEMS (CARDS) CALCULATIONS SDAR: CP-87-79 (INTERIM REPORT)
/
Gent!emen'.
On August 28, 1987, we verbally notified your Mr. R. F. Warnick of a deficiency involving cable field installctions which may be inconsistent with t'ie manner in whi:h the Cable and Raceway Date System (CARDS) calculates percent fill and cable weigot loading for cable trays. We are reporting this issue under the provisions of 10CFR50.55(e).
The ' required information
- follows, t-
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Description:==
During a CARDS report analysis a deficiency has been identified and confinned during a field investigation.
The CARDS computer program did not accurately account for tolerances used by Construction for the entrance or exit of cable at cable tray segments. Consequently, when CARDS calculates percent fill and cable weight loading within a particular cable tray section, the calculation may not take into account all cables which are installed within the specific cable tray section.
A preliminary impact study of CARDS has identified a population of cable trays that require additional analysis.
'rocedure EC3-5.01 15 is currently in place to initiate a review and analysis of affected t.ible tray suppurts.
Safety implications We have conservatively assumed that the use of CARDS (uncorrected) could have resulted in an overloaded cable tray section.
Faibre of cable trays to perform their intended design fuiiction could result in an inability of associated safety related systems to pe.fonn as required for safe plant operations and shutdown.
8801210144 080111
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TXX-88062 January 11, 1988 Page 2 of 2 l
Corrective Action Utilizing basic node-to-node data c.intained in CARDS, a software pr9 gram has been developed to calculate the maximum possible fill in individual tray sections.
This information has been summarized in a-report, and provided for performance of the impact study on tray loading by the tray design organizations. Overloaded tray sections will be documented on NCRs and corrected.
To prevent recurrence of this problem, CARDS will be revised.
We will supplement this report no later than February 79, 1988, to summarize the results of the impact studies, and corrective actions.
Very truly yours,
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47 W. G. Counsil I
WJH/grr c - Mr. R. D. Martin, Region IV Residentinspectors,CPSES(3) i t
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