05000285/LER-1981-001-01, /01T-0:on 810114,discovered That FT-236 Changing Header Flow Lacks Complete Info to Qualify for Harsh Radiation Svc Required by IE Bulletin 79-01B.Caused by Incomplete Matls List.Transmitter Will Be Replaced

/01T-0:on 810114,discovered That FT-236 Changing Header Flow Lacks Complete Info to Qualify for Harsh Radiation Svc Required by IE Bulletin 79-01B.Caused by Incomplete Matls List.Transmitter Will Be Replaced

ML19341B246
Person / Time
Site:	Fort Calhoun
Issue date:	01/15/1981
From:	Mehaffey R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19341B244	List: 05000285/LER-1981-001, Forwards LER 81-001/01T-0 05000285/LER-1981-001-01, /01T-0:on 810114,discovered That FT-236 Changing Header Flow Lacks Complete Info to Qualify for Harsh Radiation Svc Required by IE Bulletin 79-01B.Caused by Incomplete Matls List.Transmitter Will Be Replaced
References
IEB-79-01B, IEB-79-1B, LER-81-001-01T, LER-81-1-1T, NUDOCS 8101300519
Download: ML19341B246 (4)

LER-1981-001, /01T-0:on 810114,discovered That FT-236 Changing Header Flow Lacks Complete Info to Qualify for Harsh Radiation Svc Required by IE Bulletin 79-01B.Caused by Incomplete Matls List.Transmitter Will Be Replaced

Event date:
Report date:
2851981001R01 - NRC Website

text

NRC FOHM 3b6 U. b. NUCLk AH HkUULA10HY COMMihSION (7-77)

LICENSEE EVENT REPORT CONTROL BLOCX: l l

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8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 LAT 68 COvT l0l1I ER]lLl@l0l5l0l0l0l2l8l5 @l0l1l1l4l8l1l@l0l1l1l5l8l1l@

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012 I I As required bv I.E.

Bulletin 79-OlB. FT-236,charnine header flow lacks Cocolete l

iOl3l 1 information to qualify it for the harsh radiation service intended. The transmitter l I o 14 l l is used for long term core cooling flow to the auxiliary pressurizer sprav.

If the l 10 I s l I transmitter should fail in a post accident situation, charging header pressure, i

10 l6 l l High Pressure Injection Flow, and pump curves can be used to determine flow.

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l l i l :7 l l it will be replaced with a qualified transmitter by the end of the 1981 l

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LER No.81-001 4

Omaha Public Power District j

Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT NO. 1

Safety Analysis

The subject transmitter, FT-236, is a Foxboro M-637 and is used to indicate high pressure safety injection pump flow through the auxi-liary pressurizer spray system during long term core cooling operations.

The transmitter provides indication only.

The transmitter is being reported as lacking qualification due to the fact that a complete materials list is not available to determine the radiation qualification and qualified life. However, based on the limited materials list available and transmitter construction, the Dis-trict would expect the transmitter to withstand the post accident high radiation environment.

Should FT-236 fail, the qualified high pressure loop injection flow transmitters, the charging pump header pressures transmitter-located in a " normal" room environment, and HPSI pump flow curve could be used to determine the flow to the pressurizer sprays. Since flow indication will not be required until about 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following an accident, the proposed measures will be adequate to insure a safe shutdown.

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LER No.81-001 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT N0. 2

Corrective Action

The transmitter will be replaced with a qualified transmitter by the end of the 1981 refueling outage.

LER No.81-001 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT NO. 3 Failure Data This is the first report of an unqualified Foxboro M-637 flow transmitter.

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