05000346/LER-1978-031-03, /03L-0:on 780325,control Room Ventilation Air Intake Chlorine Detectors 12-h Channel Check Not Recorded. Caused by Procedural Deficiency.Chlorine Detector Reading Inadvertently Deleted During Reading Sheet Revision 771111

/03L-0:on 780325,control Room Ventilation Air Intake Chlorine Detectors 12-h Channel Check Not Recorded. Caused by Procedural Deficiency.Chlorine Detector Reading Inadvertently Deleted During Reading Sheet Revision 771111

ML19326A441
Person / Time
Site:	Davis Besse
Issue date:	04/19/1978
From:	Marley J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A440	List: 05000346/LER-1978-031, Forwards LER 78-031/03L-0 05000346/LER-1978-031-03, /03L-0:on 780325,control Room Ventilation Air Intake Chlorine Detectors 12-h Channel Check Not Recorded. Caused by Procedural Deficiency.Chlorine Detector Reading Inadvertently Deleted During Reading Sheet Revision 771111
References
LER-78-031-03L, LER-78-31-3L, NUDOCS 8002030273
Download: ML19326A441 (3)

LER-1978-031, /03L-0:on 780325,control Room Ventilation Air Intake Chlorine Detectors 12-h Channel Check Not Recorded. Caused by Procedural Deficiency.Chlorine Detector Reading Inadvertently Deleted During Reading Sheet Revision 771111

Event date:
Report date:
3461978031R03 - NRC Website

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LICENSEE EVENT REPORT (l ' ~

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8 EVENT DESCRIPTION AND PROBABLE CONSECUENCES h it was determinedJ l o l a l l While reviewing surveillance requirements at 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br /> on 3/25/78, l

l o I 31 I that the 12' hour channel check of the Control Room Ventilation Air Intake Ch J

[ o 141 l Detectors was not b.2ing recorded as required by Technical Specification Surveillance l o i s j l Require =ent 4.3.3. 7.

There was no danger to the health and safety of the public or l

IoI6I l unit personnel. The operators continued to monitor the detectors although the infor-I The monthly surveillance test verified ocerability of these i l o j 7 l j mation was not recorded.

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i

li j o j l The failure to record the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> channel check of the chlorine Detectors was caused i i #, j l by a procedural deficiency. On Novenber 11, 1977, the Chlorine Detector readine i

j requirement was inadvertently deleted from the Hourly Reading Sheet during a revision J On E rch 25, 1978, a modification was I

g,;3j l which combined the Hourly Reading Sheets.

I l i=nediately implemented to assure the surveillance requirements were comoleted.

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3"C'_~M. D.~..Zu ST.".! ION O-SUPPLEMENTAL INFORMATION FOR LER NP-33-78-37 DATE OF EVEUT: March 25, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATIONOFOCCURRENCb:

Control Room Ventilation Air Intake Chlorine Detec-l tors' channel check was not being recorded 4

Conditions Prior to Occurrence: The unit was in Mode 3, with Power (MWT) = 0, and Load (MWE) = 0..

l Description of Occurrence: While reviewing surveillance requirements at 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br />

.l on March 25, 1978, it was determined that the twelve hour channel check of the Control Room Ventilation Air Intake Chlorine Detectors was not being recorded.

Technical Specification Surveillance Requirement 4.3.3.7 states "The chlorine Detection System shall be demonstrated operable by performance of a channel check at least once per twelve hours, a channel functional test at least.once per 31 days and a channel calibration at -least once per 18 months."

Designation of Apparent Cause of Occurrence: The failure to record the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> channel check of the Chlorine Detectors was caused by a procedural deficiency.

Until November 11, 1977, the chlorine Detectors were monitored every shif t and recorded on the Auxiliary Building Hourly Reading Sheet 2.

On November 11, 1977, the Chlorine Detector reading requirement was inadvertently deleted from the Hourly Reading Sheet during a revision which combined the Hourly Reading Sheets.

The operators continued to monitor the Chlorine Detectors, but did not record the information. As a result, the deficiency occurred from November 11, 1977 until its discovery on March 25, 1978, at which. time Modification T-2638 was -

written for Surveillarice Test ST 509.9.01, " Miscellaneous Instrument Shift check" ~

to include the monitoring of the' Chlorine Detectors. The deficiency also occurred on March 26, 27, 28 and 29, 1978, as the result of operators using an unrevised Surveillance Test ST 5099.01 procedure.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The operators continued to monitor the Control Room Ventila-tion Air Intake Chlorine Detectors without recording the information. The opera-tors continued to inspect the general area in concern on a routine basis every shift.

Surveillance Test ST 5037.02 " Chlorine Detector System Monthly Test" verified the operability of these detectors on a monthly basis for November.1977 through March 1978.

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TOLEDO EDISON COMPANY 4

. DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION PACE 2 SUPPLEMENTAL INFOPliATION FOR LER NP-73-78-37

Corrective Action

On March 25, 1978, Modification T-2638 was written for the Surveillance Test ST 5099.01, " Miscellaneous Instrument Shif t Check" to include This l

the required monitoring of the Control Room Air Intake Chlorine Detectors.

modification was immediately implemented in an attempt to assure the surveillance 4

requirements were co=pleted.

Failure Data: There has been one previous occurrence of a log sheet deficiency l

causing a failure to complete the surveillance requirement (Licensee Event Raport :. 77-05).

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