ML20039G582

Final Rept on Significant Const Deficiency 19 Re Target Rock Motor Operated Valves,Bushing Not Staked.Valves in High & Low Pressure Safety Injection Sys Modified to Prevent Threaded Bushings from Rotating

ML20039G582
Person / Time
Site:	Waterford
Issue date:	01/05/1982
From:	Mclendon G ARKANSAS POWER & LIGHT CO., LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, IEC-80-04, IEC-80-4, W3K81-0478, W3K81-478, NUDOCS 8201180456
Download: ML20039G582 (3)

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' l.OUISIANA saa octAnoNot S1neer POWE R & LiGH T P O BOX SOO8

• NEW OnLEANS. LOUIStANA 70174 . (504) 366-2345

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January 5, 1982 G. D. McLENDON Senior Vice President W3K81-0478 Q-3-A35.0 ,

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Mr. John T. Collins, Regional Administrator, Region IV l g MCIWiED 7

U. S. Nuclear Regulatory Commission ] g- Wb 611 Ryan Plaza Drive, Stite 1000 Arlington, Texas 76012 g p N -

SUBJECT:

WATERFORD SES UNIT NO. 3

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DOCKET No. 50-382 -

FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 19

" TARGET ROCK MOTOR OPERATED VALVES-BUSilING NOT STAKED"

REFERENCE:

LP&L Letter W3K80-0013 to NRC dated December 15, 1980 LP&L Letter W3K81-0278 to NRC dated July 31, 1981.

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 19,

" Target Rock Motor Operated Valves-Bushing Not S taked". -

All corrective action work for this significant construction deficiency is now complete and reinspection has been accomplished. If we can be of further assistance in this matter, please advise.

Very truly yours, GDMcL:LLB:ncd cc: 1) Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with 15 copies of report)

2) Director Of fice of Management g Information and Program Control U. S. Nuclear Regulatory Commission 5 Washington, D. C. 20555 /

(with I copy of report) h 8201180456 820105 PDR ADOCK 05000382 S PDR .

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,6 LOUISIANA 20WER & LIG11T CGMPANY WATERFORD SES UNIT No. 3 Final Report of Significant Construction Deficiency No. 19 Target Rock Motor Operated Valves-Bushing Not Staked Reviewed by: ,//1 - '

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R.'Jp 11thiser - Site Manager Date 4d Reviewed by: 72.

J. L. Wills - Project S$perintendent k Date M /7// /

Reviewed by: }L n lift 3f81fiflZon.fh [ N a f D. l2f2SfS{

J. Hart - Project Licensing lngineer

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Reviewed by: L l J.d utierrez - Q. A. Site Supervisor Date December 23, 1981

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FINAL REPORT 4 SIGNIFICANT CONSTRUCTION DEFICIENCY NO.19 TARGET ROCK MOTOR OPERATED VALVES-BUSHING NOT STAKED Introduction This report is submitted pursuant to 10CFR50.55(e)(3). It describes a deficiency with the design of the subject valves which was detected at ano ther

. nuclear generating facility as identified in NRC IE Circular No. 80-04 Section IV dated March 14, 1980.

Description As detailed in IE Circular 80-04, an investigation of the failure of a High Pressure Safety Injection (HPSI) header shut-off valve at another nuclear generating station revealed that the threaded bushing was loose. The bushing was not staked or otherwise secured to prevent movement. This bushing is part of the mechanism which converts the valve stem rotation to linear travel of the disk. The full open limit switch is gear driven by the valve operator and movement of the bushing can alter the relationship between stem rotation and linear travel such that travel in the open direction may be terminated prematurely by the limit switch, i Safety Implication l

l If one or more of the bushings in either H2SI or LPSI shut-off valve were to loosen and back out, valve stem travel could be terminated prematurely -by the limit switch, and with the valve not fully open, safety injection flow might then be restricted to a value less than was assumed in the FSAR. Thus, there would be degradation in operation of the safety related HPSI and/or LPSI systems.

Corrective Action All twelve valves of this type involved in the HPSI and LPSI systems have been j modified to prevent the threaded bushings from rotating. This work was accomplished via NCR-W3-2880 and Permanent Plant Equipment Service Form No.

81-10-231.

l l All corrective action work for this significant construction deficiency has been completed and reinspection has been accomplished.

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