05000338/LER-1980-020-03, /03L-0:on 800129,during Mode 1 Operation,B Casing Cooling Subsystem Rendered Inoperable.Caused by Disconnection of LT-RS-103B Level Transmitter During Design Changes.Level Transmitter Reinstalled

/03L-0:on 800129,during Mode 1 Operation,B Casing Cooling Subsystem Rendered Inoperable.Caused by Disconnection of LT-RS-103B Level Transmitter During Design Changes.Level Transmitter Reinstalled

ML19296D470
Person / Time
Site:	North Anna
Issue date:	02/27/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19296D466	List: 05000338/LER-1980-020, Forwards LER 80-020/03L-0 05000338/LER-1980-020-03, /03L-0:on 800129,during Mode 1 Operation,B Casing Cooling Subsystem Rendered Inoperable.Caused by Disconnection of LT-RS-103B Level Transmitter During Design Changes.Level Transmitter Reinstalled
References
LER-80-020-03L, LER-80-20-3L, NUDOCS 8003040629
Download: ML19296D470 (2)

LER-1980-020, /03L-0:on 800129,during Mode 1 Operation,B Casing Cooling Subsystem Rendered Inoperable.Caused by Disconnection of LT-RS-103B Level Transmitter During Design Changes.Level Transmitter Reinstalled

Event date:
Report date:
3381980020R03 - NRC Website

text

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[ On January 29, 1930, during Mode 1 operation, "B" cas ing cool i ng_fuM vs tem wa s 1

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pon campletion of the design change lthe level transmit ter was reinstalled which restored level indication and proper l

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4 Virginia Elect ric and Power Conpany Attachment: Page 1 of 1 No r th An na Powe r Station, i:n i t fl Docket No. 50-333 Report No. LER 80-20/03L-0 Desc ript ion of Event On Janua ry 29, 19 80, with the unit at 48% powe r,

"B" cas ing cooling subsys tem rendered inoperable when casing cooling tank level transmitter LT-RS103B was was disconnected.

With the transmit te r removed from se rvice, a simulated low tank level resulted which, due to an inte rloc k, imposed a close signal on c:tsing cooling pump discharge valve "0V-RSl003 and prevented it from opening on a CDA signal if required.

This occurrence is contrary to T.S. 3.6.2.2.b.

and reportable pursuant to T. S. 6. 9.1. 9. b.

Probable Consequences of Occurrence The casing cooling subsystem is provided to supply cold water to the suction piping of the outside recirculation spray pumps for the purpose of increasing the net positive suction head.

Because "A" casing cooling subsystem remained available for operation if required and "B" casing cooling subsystem was restored to operable status within the 7 day time limit allowed by the applic-able ACTION statement, the health and safety of the general public were not af fec ted.

The re are no generic implications associated with this event.

Cause of Event

Level t ransmit te r LT-RS103B was disconnected for the scheduled implementation of Design Change 79-S63 which installed a heat traced enclosure around the transnitter to prevent freezing during cold weather.

The final design controll-ing procedure involved with the design change did not specificnlly call for the renoval or reinstallation of the transmitter during the course of mod ifica-tion.

Howeve r, temporary disconnecting of the transmitter power supply was nade necessary to allow for penetration of the power supply conduit through the wall of the enclosure.

Imme d ia t e Correc t ive Action The ACTION statement of T.S. 3.6. 2. 2 was ente red and compliance with the requirenents was maintained.

Af ter completion of the design change, the level transmit ter was reconnected which restored level indication aad re turned valve MOV-RS1003 to its proper operating condition.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence Since the accomplishnent of DC 79-S63 is a one time occurrence, no further actions are required.