ML18030A277

Final Deficiency Rept Re Defects in Workmanship of Wiring Connections on American Warning & Ventilating,Inc.Dampers, Originally Reported on 800506.Verification of Corrective Actions to Be Completed on 810522 by Unannounced Audit

ML18030A277
Person / Time
Site:	Susquehanna
Issue date:	05/01/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, PLA-716, NUDOCS 8105110300
Download: ML18030A277 (5)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8105110300, DOC ~ DATE: 81/05/01 NOTARIZED: NO DOCKET' FACIL!50-387 Susquehanna- Steam Electric Station~ Unit 1< Pennsylva 05000387 50 388 Susquehanna Steam Electric Stations Unit 2< Pennsylva AUTH, NAME AUTHOR AFFLLIAT ION CURTI SIN ~ > ~ Pennsylvania Po~er' Light Co<

RECIP ~ NAME RECIPIENT AFF ILIATION GRIER~B,H, Region- 1i Philadelphiai Office of the Director*

SUBJECT:

Final deficiency rept re defects in workmanship of wiring connections on- American Warning 8, Ventilating~ Inc,dampersi originally reported on 800506.Verification of corrective actions to be. completed on 810522 by unannounced audit, DISTRIBUTION CODE: 8019S, COPIES RECEIVED:LTR ~ ENCL ~ SIZE:

TITLE'- Construction Def i ci ency Report (10CF R50.55K)

NOTES:Send IRE 3 copies FS'AR* L all 05000387 ISE 3 copies FSAR K all amends'end amends, 050003'88 REC IP IKNT COPIES RECIPIENT COPIES IO COOK/NAME, LTTR ENCL ID CODE/NAME LTTR ENCL-ACTION: A/D LICKNSNG 04 1 1 LIC BR ¹2 BC 05 1 1 RUSHBROOKpM, 06 1 STARj<pR ~ 07 1 1 INTERNAl.: ASLBP/J,HARD 1 1 0/0IR HUM FAC15 1 1 EDO 5 STAFF 19 1 1 EQUIP QUAL BR11 1 1 HYD/GEO BR 1 1 ILE 09 1 1 2?'E/KES'PA 1 1 L I C QUAL,BR 12 1 1

20. 1 1 NRC POR: 02 1 1 OELD 21 1 1 PROC/TST REV 13 1 1 QA BR 1 1 01 1 1 STANDRDS DEV 21 1 1 EXTERNAL: ACRS 16 16 16 LPOR 03 NSIC 08 1 1

~~ ~g )st TOTAl, NUMBER OF COPIES REQUIRED: LTTR 37 ENCL 37'

TWO NORTH NINTH STREET ALLENTOWN, PA. I'8 I 0 I PHONEr l2 I 5) 770.5) 51 NORMAN Vr. CURTIS Vice President-Engineering 8, Construction-Nuclear 770-5381 May 1, 1981 QgV(QQ Mr. Boyce F. Grie" Director, Region X U. S, Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 SUSQUEHANNA STEAM ELECTRXC STATXON DEFXCXENCy XN AMRXCAN WARMXNG AND VENTXLATXNG BACK DRAFT XSOLATZON DAMERS (BDXD)

FR's 100450/100508 FXLF.,840-4 PLA-716

Reference:

PLA-485 dated May 19, 1980

Dear Mr. Grier:

This letter serves to provide Ze Comm'ss'on with a final report of a deficiency relating to defects in the workmanship of certa'n wiring connections on American Warm'ng and Ventilating, Xnc. (AWV) dampe s. The deficiency was originally reported under tne provisions of 10 CFR 21 in AWV's letter to the NRC dated May 6, 1980. PLA-485, dated May 19, '980, advised the Comme ssion Bat PPEL was eva'uat'ng the subject condition for reportability under 10 CFR 50.55(e) . The information conta'ned in this reoort is submitted pursuant to the provisions of 10 CFR 50.55'(e) .

The attachment to this lette contains a description of the p"oblem, 'ts cause, safety implications anc significance and the correct'-ve action taken to preclude recurrence.

We trust the Commission will find the informat'on orwarded by tnis letter to be satisfactory.

Very truly yours, N. W. Curtis Vice President-Eng'eering & Construction-Nuclear Attachment .

FLW:sab PENNSYLVANIA POWER 8 LIGHT COPAP*NY

\

83 0 8 X x r>~~

Mr. Boyce H. Gr'r CC: Mr. Victor Stello (15)

Direc tor-Of fice of Znspection & "-nforcement U. S. Nuclear Regula,atory Comm'ssion Washington, D.C. 20555 Mr. G. HcDonald, Director (1)

Office of Management information & Program Control U. S. Nuclear Regulatory Commission Wash'ing ton, D.C. 20555 Mr. Gary Rhoads U, S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA 18655

Attachment to PLA-716 .May 1, 1981 BACKGROUND Defects in the workmanship of some w'ring connections on fifty eight (58)

AWV dampers Model Number 8700 were identif'ed:n AWV's 10 CFR 21 notification letter to the NRC dated May 6, 1980. The de ects were originally discove'"ed in similar AWV dampers 'nstalled at another nuc'ear generating facility.under construct'on. The AWV letter indicated that SSES damoers were also affected and Bechtel QC consecuently tagged the subject dampers under their nonconformance control system pending AWV corrective action instruct'ons.

DESCRIPTION OF DEFICIENCY

,The def'c'ency relates to improperly crimped r'ng terminal connec ors and the butt splice connectors on wir'ng within tne junction boxes of the BDID's purchased under specif'cation M-33'6A. Some of the wires could be pulled out of connectors by a light hand appl'd tensile force. The AWV crimping tool 'he used in manufacture die not make crimps consistently capable of meeting the 70 lb.

min'mum pull test recuired by Underwrit'ng aboratories specifications as

~

.referenced by Bechtel purchase speci ication M-3'36A paragraph 7.1. Bechtel source inspection activities at AWV did not require physical checkng of the w'res and connectors for adequate crimos. Only a visual inspection was required.

thus the 'mproperly crimped connectors were not d'scovered dur'ng Bech el activities. source'nspection SAFETY IMPLICATIONS The unction of the BDID's 's to protect divisional'zed electrical and mechanical systems from the effec"s of a high energy p'pe break outside of conta'nment. It is intended that such breaks will be perm'tted to disable only one division of an electrical or mechanical divisionalized system. The dampers are used o provide isolation for rooms such as the RHR piping room and the Reactor Core Isolation Cooling Pump room. Fa'lure of these, or similar dampers, from provid'ng such isolation could possibly affect the sa e operation of the nuclear power plant.

The deficiency necessitated extensive repa'" to establ'sh the adequacy of the damoers to perform their 'ntended safety function. A significant breakdown 'n the quality assu"ance program at Awv was concluded to have allowed this deficiency to occur and go undetected. Tnerefore, the cond't'on is considered reportable under the conditions of '0 CFR 50.55(e) .

CORRECTIVE ACTION TAKEN The crimping tool used at AWV has since been placed under thei" 'calibration program to prevent inadequate crimps 'from being made in the future. Adc'tionally, the Bechtel Procurement Supplier Quality Inspection instructions have been modified to include a snot-check examinat'on o" terminal boxes,fo" correct wi es and connectors and proper connections. This 'ncludes physical and v sual checking of the integr'ty.of crimped connectors prior to the'r release from the factory.

Attachment to PL'A-716 May 1, 1981 issued a repa'r procedure titled "Wiring Connector Replacement

'7 AW/ has Procedure or Single and Double Isolation Dampers." This procedure 'dentified all necessary connector replacements. All replacements h'ave been completed and 100% QC inspection of the repaired BDlD's electr'cal connectors has been performed. All work has been accepted as satisfactory by Bechtel QC thus resolving the subject deficiency at SSES.

PL NQA is scheduled to perform a verificat'on of this correct've action in an unannounced audit wnich will be ccmpl'eted by May 22, 1981.