05000265/LER-1980-031-01, /01T-0:on 801116,reactor Core Isolation Cooling Discharge Isolation Valve MO-2-1301-49 Would Not Open from Control Room.Caused by Faulty Torque Switch.Torque & Limit Switches Cleaned,Checked & Exercised

/01T-0:on 801116,reactor Core Isolation Cooling Discharge Isolation Valve MO-2-1301-49 Would Not Open from Control Room.Caused by Faulty Torque Switch.Torque & Limit Switches Cleaned,Checked & Exercised

ML20002B115
Person / Time
Site:	Quad Cities
Issue date:	11/24/1980
From:	Mendenhall E COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20002B110	List: 05000265/LER-1980-031, Forwards LER 80-031/01T-0 05000265/LER-1980-031-01, /01T-0:on 801116,reactor Core Isolation Cooling Discharge Isolation Valve MO-2-1301-49 Would Not Open from Control Room.Caused by Faulty Torque Switch.Torque & Limit Switches Cleaned,Checked & Exercised
References
LER-80-031-01T-01, LER-80-31-1T-1, NUDOCS 8012090452
Download: ML20002B115 (2)

LER-1980-031, /01T-0:on 801116,reactor Core Isolation Cooling Discharge Isolation Valve MO-2-1301-49 Would Not Open from Control Room.Caused by Faulty Torque Switch.Torque & Limit Switches Cleaned,Checked & Exercised

Event date:
Report date:
2651980031R01 - NRC Website

text

U.S. NUCLEAR REGULATORY CU&tMiniUN NRC FORM 366 (7 77; LICENSEE EVENT REPORT CONTRGL BLOCK: l l

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h During the performance of QOS 1300-3 RCIC Motor Operated Valve Operability Test, l

3,;j l the RCIC discharge isolation valve M0-2-1301-49 would not open from the Control l

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, l Room. This caused RCIC to be inoperable. Also, while demonstrating HPCI l

gg., l operability, per Technical Specification 3.5.E.2., it was also found inoperable due l g;;E, ;

to an oil leak. An orderly shutdown was initiated. Automatic Blowdown, LPCI, and l

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torque switch was replaced and the limit switch on the operator was cleaned and 1

j: ; ; j checked for proper operation. The valve was exercised satisfactorily three times

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LER NUMBEn:

80-31/0lT-0 ll.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill.

FACILITY NAME: Unit Two IV.

DOCKET NUMBER: 050-265 V.

EVENT DESCRIPTION

On November 16, 1980, at 0030, during the routine monthly performance of QOS 1300-3, (RCIC Motor Operated Valve Operability Test), as required by Technica l Speci fications 4. 5.E.1. and 4.3. A. I.d., it was discovered that MO-2-1301-49, RCIC Discharge isolation to the Reactor Feedwater System, would not open from the Control Room. This caused RCIC to be inoperable.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

Per Technical Specification 3.5.E.2. continued reactor operation without RCIC availability is allowed for seven days, if all active components of HPCI are operable. Action was taken to verify HPC! availability by the performance of QOS 2300-2 and, QOS 2300-3, HPCI Pump Operability Test and HPCI Motor Operated Valve Operability Test.

Generator load was reduced to 400 MWe for repair cf M0-2-1301-49 While running HPCI, annunciator 902-3-G-10, HPCI Hi/Lo Oil Level, alarmed. This eventually led to HPCI being declared inoperable due to an oil leak in the HPCI Turbine Stop Valve.

Since RCIC was also inoperable, per Technical Specification 3.5.E.3., an orderly shutdown was initiated to bring the reactor pressure to less than 90 psig within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> if HPCI remained inoperable.

RCIC was returned to service at 1020 and HPCI at 1145 The reactor was returned to normal operation and load was increased at 1340 on 11-16-80.

At all times the unit was operated within the boundaries of the Technical Specifications. The availability of normal feedwater, Automatic Blowdown, LPCI, and Core Spray gives adequate safety protection in the case of this temocrary loss of the RClC and HPCI systems.

Vll.

CAUSE

After examining the MO-2-1301-49 valve and its motor operator, it was found to be a faul ty torque swi tch on the Limitorque Model SMB-000 operator that caused the valve to fall to open.

Vill. CORRECTIVE ACTION:

The torque switch was replaced, and the limit switches on the operator were checked for proper adjustment and their contacts were cleaned.

M0-2-1301-49 was exercised three times at 1020 on November 16, 1980, and QoS 1300-2 (RCIC Pump Operability) was completed.

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