ML19309B165

LER 80-025/03L-0:on 800228,during Normal Operation While Conducting Surveillance Tests,Average Power Reactor Monitor B Remained Inoperable When Function Switch Was Returned to Operation Position.Caused by Normal Hysteresis Effect

ML19309B165
Person / Time
Site:	FitzPatrick
Issue date:	03/28/1980
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309B162	List: ML19309B161 ML19309B165
References
LER-80-025-03L, LER-80-25-3L, NUDOCS 8004030218
Download: ML19309B165 (2)

Text

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 80-025/03L-0 Page 1 of 1 During normal operations, while conducting Operations Surveillance Test F-ST-5B titled "APRM instrument Functional Test", APRM channel 'B' remained " Inoperable" when the function switch was returned to the operate position at the completion of the test. APRM channels 'D' and

'F' which are in the same safety channel were operable thus meeting the minimum requirements of Technical Specificatios Table 3.1-1. The event did not represent a significant hazard to the public health and safety.

Investigation revealed that normal hysteresis effects did not allow the Instrument to return to operable status when the function switch was returned to the operate position. APRM 'B' was operating with eleven (11) LPRM inputs which is the minimum allowed by Technical Specifications.

Since the number of LPRM inputs was at the minimum, the LPRM count circuit was susceptible to minor disturbance. As part of F-ST-5B, the movement of the instrument function switch through its test positions caused enough disturbance of the LPRM count circuit to cause an "lnoperable" output. Manipulation of LPRM control switches and the APRM function switch could restore the instrument to operable status. However, a minor adjustment was made to the LPRM count circuit to overcome the hysteresis effects and thus avoid problems with the instrument during future routine surveillance. Following adjustment, the instrument was demonstrated to be fully operable by satisfactory completion of F-ST-5B and returned to service approximately nine (9) hours after discovery of the problem.

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