ML20008F443

LER 81-011/03L-0:on 810205,post-accident Monitoring Instrument HPI Flow 1-2 Was Declared Inoperable.Caused by Bad Current Buffer.Current Buffer Was Repaired,Recalibr & Reinstalled.Hpi Flow 1-2 Was Returned to Operable Status

ML20008F443
Person / Time
Site:	Davis Besse
Issue date:	03/06/1981
From:	Makatura L TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20008F442	List: ML20008F441 ML20008F443
References
LER-81-011-03L, LER-81-11-3L, NUDOCS 8103130594
Download: ML20008F443 (2)

Text

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7 8 60 61 DOCK ET NLYt3ER Ni b3 EVENT DESCRIPTION AND PRO 9ABLE CONSEQUENCES h l o l 2 l l (NP-33-81-10) on 2/5/81 at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br />, the NRC Site Inspector noticed that the High [

] o 13 l l Pressure Injection Pump 1-2 flow indicator FYI-HP3B read 150 gpa even though the pump l j

gog4ll was not on. Post Accident Monitoring Instrument High Pressure Injection (HPI) FlCw 1-2 was declared inoperable. The station entered the action statement of Technical l la lsi l There was no danger to j o s l Specification 3.3.3.6 which requires a repair within 30 days.

lo l 7 l l the health and safety of the public or station personnel. HPI Trains 1 and 2 were l l

1 o I a i l operable during this time. 60 7 8 9 COVP. VALVE SYS TE'.1 CAUSE CAUSE CODE CODE SUSCODE COYPONENT CCDE SUSCCCE SUBOOCE g 9 l Sl Fl@ W@ l G l@ lI lN lS lT lR lU l@ l Cl@ W @

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47 33 34 36 31 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l o l l The cause of the FYI-HP3B indicator f ailure was a bad current buffer. Under Mainten- 1 i i l ance Work Order IC-263-81, the bad current buffer (FT-HP3B) was repaired, recalibratedi

, 7 [and then reinstalled. HPI Flow 1-2 was returned to operable status on February 6, t l

, , , .,, l 1901, recOving the station from the acticn statement.

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W TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-10 DATE OF EVENT: February 5, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: High Pressure Injection (HPI) Flow Indication (FYI-HP3B) read incorrectly due to bad current buffer Conditions Prior to Occurrence: The unit was in Mode 1 with Power (MWT) = 2412 and Load (Gross MWE) = 792.

Description of Occurrence: On February 5, 1981 at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br />, the NRC Site Inspector was looking over control panels and noticed that FYI-HP3B indicated approximately 150 GPM though no HPI pump was on. Post Accident Monitoring Instrument HPI Flow 1-2 was declared inoperable. The station entered the action statement of Technical Specifica-tion 3.3.3.6 which requires this post-accident monitoring instrumentation channel to be operable in Modes 1, 2, and 3. The action statement requires the instrumentation be returned to operable status within 30 days or be in hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Designation of Apparent Cause of Occurrence: The loss of Train 2 HPI flow indication in the control room was caused by random failure of a current buffer.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. HPI Trains 1 and 2 were still operable during this time.

Corrective Action: Under Maintenance Work Order IC-263-81, the bad current buffer (FT-HP3B) was repaired, calibrated, and installed. FYI-HP3B was declared operable at 0925 hours0.0107 days <br />0.257 hours <br />0.00153 weeks <br />3.519625e-4 months <br /> on February 6, 1981 which removed the station from the action statement.

Failure Data: There have been no previous occ mes.

LER #81-011

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