ML19309B169

LER 80-031/03L-0:on 800229,discovered Foxboro Model E17DM Transmitter,Installed to Replace Rosemount Model on Casing Cooling Tank Level Transmitter,Was Not Seismically Qualified as Required.Caused by Misinterpretation of Data

ML19309B169
Person / Time
Site:	North Anna
Issue date:	03/28/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309B167	List: ML19309B166 ML19309B169
References
LER-80-031-03L, LER-80-31-3L, NUDOCS 8004030221
Download: ML19309B169 (3)

Text

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EVENT DESCRIPTION AND PROBADLE CONSEQUENCES h l 012 l l On February 20, 1980, it was discovered that the Foxboro model E17DM transmitter which 10 i 3 i l had previously been installed to replace Rosemount model 1152115A2AO on casing cooling l l0 l4 l l tank level transmitter LT-RS 103A, was not sesmically qualified as required. 'Ih e j l0 Isl I health and safety of the general public were not affected by this event. Reportable l IO lc l l pursuant to T. S . 6. 9.1.9. C. l l0l7ll l 101811 I DE CODE S SC E COMPONENT CODE SUB O'E S ODE 7

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l1 l8 l0 [g j 47 i CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 0 l l The substitution was evaluated by an engineering study which, due to a misinterpre- l l3 g i ; l tation of the data available, incorrectly determined the replacement transmitter to l

, 7 l to be qualified. A Rosemount transmitter, similar to the original, was removed from l 3 ., l the Unit 2 casing cooling system and installed in place of the non-qualified l'oxboro l

, ,, l component. l 7 8 9 80 ST S  % POWER OTH E R STATUS 015 O RY DISCOVERY DESCRIPTION i s ]@ l 1 l 0 l 0 lgl NA l lDl@l Notification from A/E l A TIVITY CO TENT HELEASED OF 9ELEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 1 6

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NAME OF PREPARER t' D r's r to righ t PHONE: (703) - S9 '-51 < 1

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Virginia Electric & Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 80-31/03L-0 Description of Event During the past refueling outage, casing cooling tank level transmitter "

LT-RS103A failed requiring the installed transmitter to be replaced. Because the level transmitter model (Rosemount model 1152115A2AO) was no longer available due to discontinuation, a Foxboro transmitter model E17DM was installed af ter an engineering evaluation determined it suitable. On February 29, 1980, it was discovered that the Foxboro transmitter which was installed was not seismically qualified as required.

Probable Consequences of Occurrence The casing cooling tank level transmitters provide level indication in the control room as well as secure the casing cooling system by closing the system supply valves (MOV-RS100A and L) on low tank level. With a transmitter not seismically qualified, a malfunction could develop in the event of a seismic occurrence which could jeopardize the proper operation of the casing cooling system. Because the discrepancy was discovered and rectified, the health and safety of the general public were not affected. There are no generic implications associated with this event.

Cause of Event The improper level transmitter was installed because the engineering l study which evaluated the substitution misinterpreted the data available and incorrectly determined the replacement transmitter to be qualified.

Immediate Corrective Action A Rosemount level transmitter, identical to the original, was removed from the Unit 2 casing cooling system and installed in place of the 1 non-seismically qualified Foxboro transmitter. The Rosemount transmitter was then calibrated in accordance with applicable calibration procedures.

Scheduled Corrective Action Foxboro model E13DM level transmitters that have been seismically l

qualified and are acceptable for use on the casing cooling tanks will be '

installed in the Unit 2 casing cooling system and used as spares for Unit 1.

o o Action Taken to Prevent Recurrence Personnel responsible for the preparation and review of the Engineering Study were advised of the mistake made and reinstructed accordingly.

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