05000312/LER-1978-013, Forwards LER 78-013/03L-0

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Forwards LER 78-013/03L-0
ML20147C835
Person / Time
Site: Rancho Seco
Issue date: 10/05/1978
From: Mattimoe J
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20147C838 List:
References
NUDOCS 7810130131
Download: ML20147C835 (2)


LER-2078-013, Forwards LER 78-013/03L-0
Event date:
Report date:
3122078013R00 - NRC Website

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%./ SACRAMENTO MUNICIPAL UTILITY DISTRICT C 1708 59th Street, Box 15830, Sacramento, California 95813;(916) 452-3211 October 5, 1978 Nuclear Regulatory Commission ATTN: Mr. R. H. Engelken NRC Operations Office, Region V 1990 N. California Boulevard Walnut Creek Plaza, Suite 202 Walnut Creek, California 94596 Re: Operating License DPR-54 Docket No. 50-312 Reportable Occurrence 78-13

Dear Mr. Engelken:

In accordance with Technical Specifications for Rancho Seco Nuclear (encrating Station, Section 6.9.4.2, and Regulatory Guide 1.16, Revision 4, Setion C.2.b.2, the Sacramento Municipal Utility District is hereby submitting a chirty-day report of Reportable Occurrence 78-13.

On September 25, 1978, while performing Surveillance Procedure 200.14 (Process Instrumentation Surveillance Calibration) it was discovered that FT-23807, High Pressure Injection Loop A Flow Transmitter, was defective.

The defect was a crack in the bellows portion of the transmitter. The bellows was replaced and the transmitter calibrated and returned to an operable condition the same day.

Although this flow transmitter is not specifically called out in the Technical Specifications as a limiting condition for operation, the loss of flow indication during the implementation of Emergency Procedure D.5 (Loss 3 of Reactor Coolant / Reactor Coolant Pressure) could cause some inconvenience.

l The flow indication serves as the means to throttle the HPI flowrate evenly among the four inlet lines, as well as limit the flowrates to prevent pump runout. Loss of flow indication on one of the four inlet lines only affects t one of the two HPI Systems and does not prevent either of the systems from performing its safety function. Operator action (positioning the valve on the inlet line without flow indication in approximately the same position as h the three other inlet line valves) would adequately compensate for the Joss of flow indication.

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R. H. Engelken '

October 5, 1978 The instrument is a Bailey differential pressure type flow transmitter, Model No. BY-3241X-A. Similar type transnitters are in service at Rancho Seco in numerous locations. This unit is the only one to date which had a defective bellows.

The District feels that this occurrence is most probably an isolated case and that the present surveillance frequency on which the instruments are calibrated is adequate to detect any potential problems in this area.

There was no plant transient or shutdown associated with this event.

Respectfully subtiitted, hr&

J. J. Mattimoc Assistant General Manager and Chief Engineer JJM:RJR:HH: sal Enclosure es: Director, MIPC (3)

Director, IE (30) _

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