ML20009G382
| ML20009G382 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 07/22/1981 |
| From: | Aswell D, Padalino J, Wills J LOUISIANA POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, W3K-81-0263, W3K-81-263, NUDOCS 8108040192 | |
| Download: ML20009G382 (3) | |
Text
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142 DELARONDE STREET POWE A & LIGHT P O BOX 6008
- NEW ORLEANS LOUISIANA 70174. (504) 366-2345 NuS$sysY$
O. L ASWELL July 22, 1981 v.c. Pes.aent-po e prow =
W3K 0263 Q-3-A35.07.24 Q-3-A35.02.01 Mr. K. V.
Seyfrit, Director, Region IV
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N U. S. Nuclear Regulatory Commiss!s O
Office of Inspection and Enforcement Q
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611 Ryan Plaza Drive, Suite 1000 dy g
Arlington, Texas 76012
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SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-382 d
Q Final Report of Significant Construction Ng;)
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Deficiency No. 24 N, r,7
" Defective Valve Manual Operators (Fisher ControlsY
Reference:
LP&L Letter W3K-81-0128 dated March 16, 1981
Dear Mr. Seyfrit:
i In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction l
Deficiency No. 24, " Defective Valve Manual Operators (Fisher Controls)".
If you have any questions, please advise.
Very truly yours, D. L. Aswell 1
LLB:grf Attachment g
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cc:
- 1) Director l
Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission h/
Washington, D. C. 20555 (with 15 copies of report" l
- 2) Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 8108040192 810722 'with 1 copy of report)
PDR ADOCK 05000382 S
'r LOUISIANA POUER AND LICilT COMPANY UATERFORD 5 :S UNIT NO. 3 Final Report of Significant Construction Deficiency No. 24
" Defective Valve Manual Operator.. (Fisher Controls)"
Reviewed by ),,rd, OY#b,a,,u.
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JJD. Padalino - Project Ingineer atf
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Reviewed by J/ I/. Wills - P ect Superintendent 6 ate
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J., liar,t - Project Licynsing Engineer Date Reviewed by ggf'e
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p, R. b Ilymes - Project Quality Assurance Engineer Date
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July 1, 1981
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'o FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 24
" DEFECTIVE VALVE MANUAL OPERATORS (FISHER CONTROLS)"
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INTRODUCTION l
1his report is submitted pursuant to 10CFR50.55(e).
It describes defects inherent in the cast iron worm gear sector of the manual valve operators supplied by Fisher Controls.
This problem is considered reportable under 10CFR50.55(e). On February 23, 1981, Mr. L. Fleetwood, Q. A. Manager with Fisher Centrols Company notified the Nuclear Regulatory Commission of this defect.
I-DCSCRIPTION i
Fisher Controls reported recent life cycle tests have resulted in the necessity to j
reduce the rated output of Size 2 Type 1073,1074,1075, and 1076 manual operators built with the cast iron worm gear sector. The basis for reducing the rated output l
13 that at the 8000 in-lbs outprt torque, the worm gear sector exhibits initiation of fatigue resulting in subsequear failure.
?ne valves in question include two containment sump isolation valves and two refuel-l ing water storage pool isolation valves.
The failure of the manual operators could cause a substantial degradation of the safety injection systen.
I SAFETY IMPLICATIONS If the refueling water storage pool isolation valves fail to operate, there would be no water available for the containment spray injection mode following a Loss of Cool-ant Accident (LOCA) or Main Steam Line Break (MSLB).
4 If the containment sump isolation valves fail to operate, there would be no water available for the containment spray recirculation mode following a LOCA or MSLB.
i In either case, this could have serious implications for the control of the contain-i ment pressure /temperatere and/or airborne radioactive material after a LOCA or MSLB.
CORRECTIVE ACTION I
Corrective repa' rs con'sisted of rep 1. acing the defective vorm gear sector with a i
manganese bronze vorm gear sector (1-3/8" wide facci which increases the actuator output rating ta 16,000 in-lbs.
Also, the 3/16" pc octween the input shaf t and worm gear has becn changed to a 1/4" diameter pin.
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The valve tag numbers af fected are 2SI -L101A, 2SI -L102B, 2SI -L103A, 2SI-L104B.
The repairs were completed and inspected on June 25, 1981, and are documented on Ebasco Permanent Plant Equipment Service Form Numbers ESU-81-5-64,ESU-81-5-65, ESU-81-5-66 and ESU-81-5-67.
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