ML19325C575

Supplemental Deficiency Rept CP-87-081 Re Weidmuller Terminal Block Connections.Initially Reported on 870831. Weidmuller Terminal Block Connection Tightness Will Be Verified Prior to Fuel Loads for Each Unit

ML19325C575
Person / Time
Site:	Comanche Peak
Issue date:	10/09/1989
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CP-87-081, CP-87-81, TXX-89729, NUDOCS 8910170081
Download: ML19325C575 (2)

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"".' Log.'# TXX 89729 L '~~. .."" F1le # 20010 C C 908.3 Ref. # 100FR50,SS(e) i' 7t# ELECTRIC i

October 9, 1989  !

W. J. Cahill Dewswr Vw knur.o i

U. S. Nuclear Regulatory Commission Attn Document Control Desk '

!- Washington, D. C. 20555 i

SUBJECT:

C0HANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50 445 AND 50 446 ,

h WEIDMULLER TERMINAL BLOCK CONNECTIONS  !

SDAR: CP 87 081 (SUPPLEMENTAL REPORT)  ;

Gentlemen: l On August 31, 1987 TU Electric verbally notified the NRC of a deficiency  ;

involving apparent inadequacies in the installation and inspection procedures t which have resulted in unacceptably loose wire connections at Weidmuller terminal blocks. The last report on this issue was logged  :

TXX 88018 dated January 6, 1989, and indicated that the issue was not f reportable pursuant to 10CFR50.55(e). However, as a result of changes in the  ;

approach to documentation of individual examples of this deficiency, it is now being conservatively reported pursuant to 10CFR50,55(e). The required  !

information follows.

l TXX 88018 indicated that based on a safety s19nificance review of the l originally identified circuits containing loose terminals, the issue did not  ;

meet the criteria for reportablity pursuant to 10CFR50.55(e). This position  !

was possible because all Weidnvu11er terminal blocks were to'be inspected as part of the Post Construction Hardware Validation Program (PCHVP) using CPE SWEC-FVM-EE/ME/IC/CS-90 (FVM 90), and identified deficiencies documented -

and evaluated for safety significance.

During the implementation of FVM 90 attribute number 116, which inspected I Wiedmuller terminal blocks to assure that the conductor terminal connections i were snug tight, it was determined that start up activities also performed l this inspection during the implementation of XCP EE-020 " Continuity and Termination Verification." XCP EE 020 was determined to be an acceptable me ,od for verification and replaced the inspections under FVM 90. However. ,

when Quality Control identified a loose terminal when inplementing FVM 90, it was required to initiate a nonconformance report. The method of XCP EE 020 differed in that when a termination was found loose, start-up was able to rework the connections and documented that the terminations were verified for tightness, but did not document the "as found" conditions (i.e., loose p terminals).

8910170081 891009 PDR ADOCK 05000443 S PDC

1. 0 North Ohve Street LB Si Dallas, Tem 73201 l Q >

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TXX 89729 October 9, 1989 Page 2 of 2 Since the "as f'ound" loose terminations were not documented, their safety significance has not been evaluated. Instead, the described deficiency is [

' considered conservatively reportable pursuent to 100FR50.55(e). l t

Weidinuller terminal block connection tightness will be verified prior to Unit I fuel load for Unit 1 and Unit 2 fuel load for Unit 2. No additional corrective action is required for this ceficiency. Supporting documentation for this issue is available for your inspector's review, Sincerely, t

< /

h William J. Cahill, Jr.

WJH/vid c - Mr. R. D. Hartin, Region IV Resident Inspectors, CPSES (3)

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