ML20150D296

Safety Evaluation Re Employee Concern Element Rept 24102, Crimp Connections

ML20150D296
Person / Time
Site:	Sequoyah
Issue date:	03/11/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
ML20127A683	List: ML20127A681 ML20150C791 ML20150C795 ML20150C800 ML20150C805 ML20150C813 ML20150C816 ML20150C822 ML20150C835 ML20150C838 ML20150C849 ML20150C896 ML20150C900 ML20150C902 ML20150C907 ML20150C911 ML20150C916 ML20150C920 ML20150C928 ML20150C933 ML20150C937 ML20150C940 ML20150C947 ML20150C951 ML20150D296 ML20150D303 ML20150D315 ML20150D318 ML20150D322 ML20150D326 ML20150D331 ML20150D334 ML20150D338 ML20150D583 ML20150D592 ML20153A915 ML20153A930 ML20153A934 ML20153A951 ML20153A974 ML20153A977 ML20153A982 ML20153A996 ML20153B005 ML20153B010 ML20153B016 ML20153B022 ML20153B042 ML20153B045 ML20153B052 ... further results
References
NUDOCS 8803230298
Download: ML20150D296 (2)

Text

..

[

UNITED STATES 8

NUCLEAR REGULATORY COMMISSION '

o

%..w.. e],E s;

s WASHINGTON, D. C 20555 SAFETY EVALUATION REPORT BY THE OFFICE OF SPECIAL PROJECTS' EMPLOYEE CONCERN ELEMENT REPORT 24102_

"CRIMP CONNECTIONS" TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR POWER PLANT, UNITS 1 AND 2 C0CKET NOS. 50-327 AND 50-328 1.

SUBJECT Category:

Engineering (20,000)

I Subcategory:

Cable Termination and Splices (24100)

Element:

Crirp Connections (24102)

Employee Concern:

JLH-85-004, PH-85-003-003 Element Report 24102, Revision 2, prepared January 26, 1987 involves trio empicyee concerns regarding the practice of terminating diodes using crimping rather than soldering of the leads.

One concern states, "PIDG lugs have apparently been used for making crimps on solid conductors resulting in reduced current capacity for CSSC fire dampers." Another concern states, "The practice of terc.inating diodes and rectifiers without soleering the wiring but only splicing by crimping to the lead-ins needs to be reevaluated for quality construction (centrol room 757' elevation)."

II.

SUP. MARY OF ISSUE The concerned employee was aware that AMP Products Corporation, manufacturer of pre-insulated diamond grip (PIDG) terminal lugs, sent a letter to all users stating that the use of crimper PIDG terminal lugs with solid copper conductors proved unsatisfactory in tests under any voltage or current ccndition.

TVA investigated the employee concern and concurred that the potential for degradation of safety-related systems existed.

Moreover, a Non-Conformance Report (NCR) was generated for Watts Bar to correct this condition but apparently no NCR was generated for Sequoyah.

As a result of this investiga-l tion TVA initiated an extensive inspection and rework program addressing the installation of PIDG terminal lugs at Sequoyah.

At tha time the employee i

concern was prepared the rework on Sequoyah Unit 2 was completed for all P10G terminal lugs except for surge suppression networks.

In addition, no plan or schedule for reworking the surge suppression networks was presented.

III. EVALUATIO_N NRC and its consultant, SAIC, reviewed the TVA employee concern.

NRC requested a d2finition of the plan and schedule to review the surge suppression networks 8803230298 880311 PDR ADOCK 05000328 i

P PDR g 01

+

, and an explanation of how correct inductive current ratings would be determined by the TVA field inspectors.

The TVA response of October 7,1987 stated that PIOG terminals could be successfully crimped on stranded wire connectors but not en solid wire connectors.

As a result, a TVA work request was issued by construction which requesteo inspection of all surge suppression networks for Sequoyah Unit 2.

The work request provided specific instructions to look for the use of insul-ated ring tongue connector on solid leads.

All suppression networks found with this condition requiring rework have been corrected and verified by TVA.

In addition, Bechtel randomly reviewed the TVA corrective action and verified the TVA results.

IV.

CONCLUSIOP Based on our review, we find the employee concern was valid and that the TVA's investigatien, evaluation and corrective acticns resolve the employee concern as described in EN-24102, Revision 2.

--