ST-HL-AE-2442, Final Deficiency Rept Re Class 1E Cable Splices.Initially Reported on 870918.Stop Work Order F-02 Issued on 871001, Stopping Installation of All Raychem Matl in Class 1E Electrical Cable Splices

Final Deficiency Rept Re Class 1E Cable Splices.Initially Reported on 870918.Stop Work Order F-02 Issued on 871001, Stopping Installation of All Raychem Matl in Class 1E Electrical Cable Splices

ML20237D964
Person / Time
Site:	South Texas
Issue date:	12/16/1987
From:	Goldberg J HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
ST-HL-AE-2442, NUDOCS 8712280060
Download: ML20237D964 (4)

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The Light  !

company P.O. Box 1700 llouston, lixas 77001 (713) 228-9211 Houston Lighting & Power -

December 16, 1987 ST-HL-AE-2442 File No. G12.403 .

10CFR50.55(e)

U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 l

South Texas Project Electric Generating Station Unit 2 Docket No. STN 50-499 Final Report Concerning 3 Class 1E Cable Splices on September 18, 1987, Houston Lighting and Power notified your office, pursuant to 10CFR50.55(e), of an item concerning Unit 2 Class 1E Cable Splices at the South Texas Project. Enclosed is our Final Report on this item. We j have determined that this item is reportable pursuant to 10CFR50.55(e),

If you should have any questions on this matter, please contact Mr.

J. S. Phelps at (512) 972-7071.

Y. k J .11. Goldberg Group Vice President, Nuclear SDP/hg

Attachment:

Final Report Concerning Class 1E Cable Splices 8712280060 871216 PDR ADOCK 05000499 S -DCD

^ subsiaiary or inousion industries incorporated /y S[

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' File No.: C12.403 Page 2 cc:

Regional Administrator, Region IV Nuclear Regulatory Commission:

'611 Ryan Plaza Drive, Suite 1000 Arlington,-TX 76011 N.. Prasad Kadambi,' Proj ect ' Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, MD. 20814 Dan R., Carpenter Senior Resident Inspector / Operations e/o U.S. Nuclear Regulatory Commission P. O. Box 910 Bay City TX 77414 Claude E. Johnson Senior Resident Inspector / Construction c/o U.S. Nuclear Regulatory ,

Commission  !

P. O. Box 910 -l Bay City , TX 77414 J. R. Newman, Esquire Newman & Holtzinger, P.C.

1615 L Street, N.W.

Washington, DC 20036 R. L. Range /R. P. Verret l l

Central Power & Light Company '

P. O. Box'2121 Corpus Christi, TX 78403 1 i

i R. John Miner (2 copies) l Chief Operating Officer  ;

City of Austin Electric Utility l 721 Barton Springs Road  ;

Austin, TX 78704 R. J. Costello/M. T. Hardt City Public Service Board  ;

P, O. Box 1771 l San Antonio, TX 78296 Revised 11/20/87 ,

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. Attachment-ST-HL-AE-2442 File No.: G12.403 i Page 1 of 2 Final Report Concerning Class 1E Cable Splices I. Summary On September ~ 18,1987, Houston Lighting and Power (HL&P) notified NRC Region IV, pursuant to 10CFR50.55(e),.of a potentially reportable item concerning safety related electrical cable splices and terminations made l subsequent to February 20, 1987 using incorrectly installed Raychem heat

! shrink insulation material which may.have affected various safety related circuits. Further investigation established that the' safe operation-of the plant could have been compromised.

II. Description of Deficiency Raychem heat shrink material used for some electrical cable splices and terminations made subsequent to February 20, 1987 has been installed incorrectly. Site procedures which require Raychem splices to be installed and inspected to the correct cable splice detail sheet generated by Engineering were not followed. In addition, some Raychem motor terminations were determined to have a bend radius less than allowed by specification. The latter deficiencies were identified where motor terminations were inspected and accepted prior to final. positioning of the splice.

These incorrect splice installations represent a breakdown in recurrence control measures implemented on or about February 20, 1987, as a result-of earlier Raychem installation problems. An investigation of Unit 2 Raychem splice installations performed after February 20, 1987 has identified 117 cables with incorrectly installed Raychem splices.

III. Corrective Action l

l 1. Stop Work Order F-02 was issued against Ebasco by Bechtel QA on l October 1, 1987 stopping the installations of all Raychem material l in Class 1E electrical cable splices.

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2. Conditional release of Stop Work Order F-02 was issued October 5, 1987 contingent upon site procedure changes and preinstruction of construction personnel to ensure that work would be performed in accordance with program requirements. Personnel involved with installation and inspection of Raychem splices have been reinstructed on current procedures. Quality Assurance has conducted surveillance'to assure that appropriate personnel have been reinstructed and that current procedures are being properly implemented in the field.

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3. Unit 2 ' installations determined not to meet Raychem criteria have been dispositioned and the corrective actions completed. For Unit 1, approximately 90% of 228 total cables with Raychem splices performed after February 20, 1987 have been inspected. To date, no Unit 1 splices have been found which could have adversely affected safe operation of the plant. Remaining inspection and rework, if.

necessary, of Unit 1 installations will be completed prior to initial criticality.

IV. Recurrence Control

1. Standard Site Procedure.26, for the installation of Raychem ]

material, has been revised to require an authorized field engineer-to choose the applicable cable splice detail to be used for each splice prior to it being issued to the craftsmen for work.

2. The site procedure has also been revised to include the requirement that bend radius inspections for Raychem installations be performed 1 after final positioning of the splice.

3. Installations are being performed (since the lifting.of the stop work order) by a selected team of personnel trained in installation and inspection of Raychem splices per the revised procedures.

V. Safety Analysis Deficient Raychem splice installations were found in the following systems: Residual Heat Removal, Component Cooling Water, Essential Cooling Water, and Reactor Coolant. Failure of the splices could have

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caused failure of the above systems. This represents a significant deficiency, which if lef t uncorrected, could have resulted in an adverse effect on the safe operation of the plant. Tharefore, we have determined that this item is reportable pursuant to 10CFR50.55(e).  !

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