ML20084L765
| ML20084L765 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/29/1974 |
| From: | Stephenson B COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 544-74, NUDOCS 8305230702 | |
| Download: ML20084L765 (2) | |
Text
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',e July 29, 1974 y
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Mr. J. F. O' Leary, Director
- Directorato of Licensing U. S. Atomic Energy Ccenission Washington, D. C.
20545
SUBJECT:
MPORT OF UNUSUAL EVENT PER SECTION 6.6.B.2 0F THE TECHNICAL SPECIFICATTONS.
l,0W PPESSUP2 COO!.A!(f INJECTION PUMP SUCTION VALVE 3-1501-5A PAIIED TO CLOSE.
References:
' 1) Regulatory Guide 1.16 Rsv.1 Appendix A
- 2) Drawin'g P&ID M-360 Report Date: July 29, 1974 Cecurrence Date: July 22,1974 racility: Drcsden 14ucicar rower station, riorris,1111nois TDENTIJICATION OF OCCURRENC_E During testing, LPCI pump suction valve MO-3-1501-5A failed to close.
10NDITIONS PRIOR TO OCCURPENCE Prior to thin ti::c, the reactor was at power and producing 680 1510. Testing of LPCI valves was in progress to fulfill a requirement for an upcoming diccel generator outage.
DESCRIPTION OF_OCCURRENQ
'On July 22,.1974 a close cignal van supplied to_ valve 3-1501-5A.
It came off its open seat then bound up and stopped.. The valve was then opened fully and a work request was submitted to inspect and repair it.
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O au1x29.1m Mr. J. F. 'O'L2 cry DESTCNATIO!! 0F APPAREITT CAUSE OF OCCURRENCE Upon inspection of valve 3-1501-5A it was fcund that the disc had overtraveled in the open direction and became cocked in the valve guides.-
ANALYSIS OF_ OCCURRENCE Since the valve is required to be in the open position for LPCI operability, 'at no time was the plant or public ' health and safety compromised in any way.
CORRECTIVE ACTIO3 1
The valve disc and operator were realigned in the valve guides and the valve checked for free operation. To prevent a repetition of this s
occurrence, the valve stroke was adjusted per vendor manual and overtravel is no longer possible.
FAILURE DATA System Number 3-1501-5A lisnufaeturer Crane Company Medal W ab -
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Type
.Gato Sizo 14" operator li. 0.
Research has turned up no previo'un failure'of this type in this system.-
Sincerely, if wt II
- D. B. Stephenson i
Superintendent BBS:GIZ:do
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