ML19341B246

LER 81-001/01T-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

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: ML19341B243 ML19341B246
References
IEB-79-01B, IEB-79-1B, LER-81-001-01T, LER-81-1-1T, NUDOCS 8101300519
Download: ML19341B246 (4)

Text

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

, ., LICENSEE EVENT REPORT CONTROL BLOCX: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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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. I 10171 I l l O la I i __]

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35 36 37 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l1 toll A connlete materials list is not avniinhin en dornr, inn vndineinn dnso l 11 11 ] l limits or qualified life. Although the transmitter is not expected to fail. l l i l :7 l l it will be replaced with a qualified transmitter by the end of the 1981 l l1 l 31 l refueling outage. l 11 141 l l 7 8 9 80 STA 3  % POWER OTHER STATUS DtS OV RY DISCOVERY DESCRIPTION l_M l [jijh l0' l 7 l5 lhl NA l lC lhl Review for IEB 79-01B l

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4 LER No.81-001 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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