ML19340E234

LER 80-087/03L-0:on 801206,while Troubleshooting,Control Room Operator Could Not Stroke Valve CV5006.Valve Declared Inoperable.Cause Unknown.Corrective Action Will Be Conducted Under Maint Work Order IC-814-80 During Next Outage

ML19340E234
Person / Time
Site:	Davis Besse
Issue date:	01/02/1981
From:	Isley T TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19340E231	List: ML19340E230 ML19340E234
References
LER-80-087-03L, LER-80-87-3L, NUDOCS 8101060705
Download: ML19340E234 (2)

Text

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[ o 12 ] l (NP-33-80-112) on 12/6/80 at 0923 'ours a control room operator was attempting to l0 l 3 l l stroke valve CV5006 for troub.wh;' ting purposes but it would not move. Additional l j

4 10 6 41 l attempts to oper' the valve were unsuccessful. CV5006 was declared inoperable, and l lol3llthe station enterec Action Statement (b) of Technical Specification 3.6.3.1. There l 1o is ] I wa.t no danger to the health and safety of the public or station personnel. CV5006 wasl l o l 7 l l already in its re@ sired safety position. Penetration P33 is also isolated by CV5008 j j

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TOLEDO EDIS0N COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-112 DATE OF EVENT: December 6, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Inoperable Containment Purge Inlet Isolation Valve, CV 5006 j

Conditions Prior to Occurrence: The unit was in Mode 3 with Power (MWT) = 0 and Load (Gross MWE) = 0.

Description of Occurrence: On December 6, 1980 at 0923 hours0.0107 days <br />0.256 hours <br />0.00153 weeks <br />3.512015e-4 months <br /> while electricians were troubleshooting for grounds on the 125/250 VDC system, a problem was discovered with CV $006. CV 5006 is on the containment purge inlet line and is the containment side isolation of penetration P33. When the control room operator attempted to stroke the valve open, it would not move. Additional attempts to open the valve were unsuccess-ful. CV 5006 was declared inoperable in the closed position, and the station entered Action Statement (b) of Technical Specification 3.6.3.1. ,The technical specification requires this containment isolation valve to be operable in Modes 1, 2, 3, and 4 with an isolation time of 10 seconds. Action Statement (b) requires the isolation of the affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> by th e use of at least one deactivated automatic valve secured in the isolation position. The condition was met.

Designation of Apparent Cause of Occurrence: The cause of the failure is unknown at this time. Troubleshooting to the containment penetration indicates the problem is beyond the penetration inside containment. Therefore, further troubleshooting will be  ;

conducted the next time containment is accessible to determine the root caose of the failure.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. CV 5006 was already in its required safety position. Penetra-tion P33 is also isolated by CV 5008 which was operable.

Corrective Action: Control power to the valve was removed with the valve in the closed position. This made the station in compliance with Action Statement (b) of Technical Specification 3.6.3.1. Further troubleshooting and corrective action will be conducted under Maintenance Work Order IC-814-80 during the next outage. .

Failure Pata: There have been no previous similar occurrences.

LER #80-087 5 <