05000339/LER-1980-036-03, /03L-0:on 800717,w/unit in Mode 2 & During Special NRC Test,Turbine Driven Auxiliary Feedwater Pump Was Connected to Header Common to Three Steam Generators.Vol in Emergency Condensate Storage Tank Below 100,000 Gallons

/03L-0:on 800717,w/unit in Mode 2 & During Special NRC Test,Turbine Driven Auxiliary Feedwater Pump Was Connected to Header Common to Three Steam Generators.Vol in Emergency Condensate Storage Tank Below 100,000 Gallons

ML19344A670
Person / Time
Site:	North Anna
Issue date:	08/14/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19344A657	List: 05000339/LER-1980-036, Forwards LER 80-036/03L-0 05000339/LER-1980-036-03, /03L-0:on 800717,w/unit in Mode 2 & During Special NRC Test,Turbine Driven Auxiliary Feedwater Pump Was Connected to Header Common to Three Steam Generators.Vol in Emergency Condensate Storage Tank Below 100,000 Gallons
References
LER-80-036-03L-01, LER-80-36-3L-1, NUDOCS 8008210428
Download: ML19344A670 (3)

LER-1980-036, /03L-0:on 800717,w/unit in Mode 2 & During Special NRC Test,Turbine Driven Auxiliary Feedwater Pump Was Connected to Header Common to Three Steam Generators.Vol in Emergency Condensate Storage Tank Below 100,000 Gallons

Event date:
Report date:
3391980036R03 - NRC Website

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h' U.S. NUCLEAR REGULAM RY-COMMISSION vI LICENSEE EVENT REPORT

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On July 17, 1980, with the unit in Mode 2, to facilitate a special test re-

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quired by the NRC 'the turbine driven auxiliary feedwater pump was connected to /

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a header common to al1~three steam generat.- s contrary to T.S. 3.7.1.2.

Also, /

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'the volume in the'Emersency Condensate Storage Tank (ECST) dropped below 110,

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000 sal. contrary to TS 3.7.1.3.

Since a safety evaluation had been performed /

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on the valve lineup'and the 300,000 gal, condensate tank was available, the

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/- ' health and safc"y of the public were not affected. Reportable by TS 6.9.1.9.b. /

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The Turbine Driven Auxiliary Feedwater Pump Endurance (48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />) Test was

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required to be performed via NRC letter from Eisenhut dated 9-28-79.

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adequate cooling water was not available due to high outside air temperatures, /

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the test was modified to allow the turbine driven auxiliary feed pump to feed /

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FACILITY-METHOD OF

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ACTIVITY

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Virginia Electric and Power Company North Anna Power Station,' Unit #2 Attachment: Page 1 of 2 Docket No. 50-339 Report No. LER-80-036/03L-0 Description of Event -

On July 17, 1980, with the unit in Mode 2, the turbine driven

- auxiliary feedwater pump (2-FW-P-2) was lined up to a header common to all three steam generators. This was contrary to T.S. 3.7.1.2 since three independent flow paths were not lined up to the steam generators.

In addition, the water volume in the Emergency Condensate Stroage Tank i

(ECST) dropped below 100,000 gal (91.4%) contrary te T.S. 3.7.1.3.

Probable Consequences of Occurrence The consequences were minimized because of the following reasons:

1.

Prior to the implementation of the endurance test, the test and required deviations on the test were approved by the station safety committee.

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A safety analysis was performed on a deviation that required that the steam driven auxiliary feed pump supply the generators instead of discharging to the Emergency Condensate Storage Tank via temporary piping. This safety analysis determined that there were no unreviewed safety questions as defined by 10 CFR50.59.

3.

During the operation of the test, an operator was stationed in the Auxiliary Feedwater Pump House for the purpose of realigning the auxiliary feedwater system, if required.

4.

The auxiliary feedwater system was returned to the normal lineup within the required 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> action statement period.

5.

Makeup water was provided continuously to the ECST during the performance of the endurance test.

Due to the above reasons the health and safety of the general public.were not affected.

Cause of Event

The lineup for the~ endurance test had to.be altered since adequate

- cooling was not_ available to prevent the Emergency ~ Condensate Storage

. Tank from exceeding maximum temperature of 120'F. 'Due to the high heat j

loads of the plant caused by. unusually high outside temperatures, cooling water was not available. An alternate method to perform the required

- test was to feed the steam generators taking suction on the Emergency Condensate Storage Tank. This method was contrary to T.S. 3.7.1.2 since three independent flow paths were not available to-feed the steam generators.

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l Attachment: Page 2 of 2 Cause of Event (cont.)

The level in the ECST dropped below 91.4% during the performance of the spectial test. Due to high heat loads on the chilled water system caused by abnormally high outside temperatures, chilled water was not available for cooling of the discharge on its recire. path back to the ECST via temporary piping.

Instead, the pump was lined up to discharge to all three steam generators as designed. -The level of the tank stabilized to approximately 80% while being gravity fed continuously from the 300,000 gallon' condensate storage tank. This test demonstrated that the steam driven auxiliary feed pump can feed all three steam generators and the ECST can maintain adequate level (80%) while being gravity fed from the 300,000 gallon storage tank for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, as designed.

Immediate Corrective Action

An operator was stationed in the Auxiliary Feedwater Pump House to realign the system, if required.

The ECST was filled above the required level upon completion of the test.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No actions taken to prevent recurrence are required.

Generic Implication There are no generic implications.