TXX-3409, Final Deficiency Rept Re Failure of Westinghouse Gate Valve to Completely Close Under Preoperational Test Conditions, Initially Reported on 810217.Westinghouse Has Issued Field Change Notices 10515 & 10537 Detailing Corrective Actions
| ML20031B950 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/28/1981 |
| From: | Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, TXX-3409, NUDOCS 8110060262 | |
| Download: ML20031B950 (3) | |
Text
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Mr. G. L. Madsen, Chief s.i Reactor Projects Branch
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U. S. Nuclear Regulatory Commission
/q Office of Inspection & Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos. 50-445 A:lington, Texas 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION WESTINGHOUSE GATE VALVES FILE:
10110
Dear Mr. Madsen:
On February 17, 1981 in accordance with 10 CFR 50.55(e), we verbally reported to your Mr. R. G. Taylor a deficiency regarding a Westinghause valve that failed to completely close under pre-operational test conditions.
We h.ve submitted interim reports logged TXX-3288, TXX-3322, and TXX-3396 dated March 13, May 21, and August 31, 1981, respectively. These reports contained information on the affected three and four inch valves. Our lates+. report expanded the sec'e of the deficiency to include 6, 8, 10, 12, 14,16 and 18 inch Westinghouse valves.
We are submitting the attached report which will complete our reporting requirements under 10 CFR 50.55(e).
If we can provide any additional information, please advise.
Very truly yours,
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. Gary RJG:kh cc: 14RC Region IV - (0 + 1 copy)
Director, Inspection & Enforcement - (15 copies) c/o Distribution Services Branch, ODC, ADM.
U. S. Nuclear Regulatory Commission Washington, D. C.
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TXX-3407 September 28, 1981 ATTACHMENT WESTINGHOUSE GA'E VALVE 5 Safety Implications The additional valves listed below are being used at CPSES and are considered to be within the scope of this def'.ciency as expanded.
Also given are the valve functions and valve location numbers.
VALVE ID SYSTEM AND FUNCTION LOC. NO.
4GM72FB CVCS - Normal Suction Isolation LCV-1128 4GM72FB - Analogous CVCS - Normci Suction Isolation LCV-112C 8GM72FB CVCS - Suction from RWST Isolation LCV-1120 8GM72FB - Analogous CVCS - Suction from RWST Isolation LCV-112E 8GM74FE SIS - Change Pump Suction Isolation 8804A 8GM74FE SIS - Change Pump Suction Isolation 8804B 4GM77FH SIS - Recirculation Hot Leg Reactor 8821A Coolant Loops Isolation 4GM77FH - Analogous SIS - Recirculation Hot Leg Reactor 8321B Coolant Lcops Isolation 6GM72FB SIS - Safety Injection Pump Suction 8923A RWST Isolation 6GM72FB SIS
- Safety Injection Pump Suction 8923B RWST Isolation 6GM72FB SIS - Recirculation Cold Leg of 8807A Reactor Coolant Loop I:olation 6GM72FB - Analogous SIS - Recirculation Cold Leg of 8807B Reactor Coolant Loop Isolation 6GM72FB SIS - Safety Injection Charging 8924 Pumps Isolation 12GM88SE RHRS - Normal Coolir.g Isolation 8701A 12GM88SE RHRS - Suction Isolation 8701B 12GM88FE RHRS - Isolation 8702A 12GM88SE RHRS - Isolation 8702B 8GM72FB SIS - Reactor Cold Legs of Reactor 8806 Coolant Loop Isolation TUSI has determined that had any of the aforementioned valves failed to close completely, there would have been no adverse safety consequences.
Corrective Actions Westinghouse has issued Field Change Notices 10515 and 10537 which detail the corrective actions to be implemented for all Westinghouse valves identified under the scope of this deficiency.
The modifications are scheduled to begin October 5,1981 and are expected to be complete no later than October 30, 1981.
t TXX-3409 September 28, 1981 ATTACHMENT WESTI!!GHOUSE GATE VALVES Please note that valves 8821A and B, Mc#14GM87 are used only to separate the hot leg safety injection from the cold leg safety injection and not used to isolate the normal and emergency flow paths in the Chemical and Volume Control System (CVCS) as previously stated in cur TXX-3288.
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