ML19326A441

LER 78-031/03L-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

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: ML19326A439 ML19326A441
References
LER-78-031-03L, LER-78-31-3L, NUDOCS 8002030273
Download: ML19326A441 (3)

Text

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LICENSEE EVENT REPORT -- .

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68 0 l 3 l 2 l S l 7 lREPORT EVENT DATE 74 75 8 l@l DATE0 l 4 80 l 1 l 9 l 7 7 8 60 61 DOCK ET NUv8 E R 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 l o j 7 l j mation was not recorded. The monthly surveillance test verified ocerability of these i 1

I o Ia l I detectors. (NP-33-78-37) 60 COMP. VA LV E SYSTEM CAUSE CAUSE SUSCODE SUSC00E CCCE CODE SUSCODE COMPCNENT CODE lo191 l Sl Gl@ l Dl@ l Z j@ lI lN l S lT lR lU l@ l Zl@ l20Zl@

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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 i # , j l by a procedural deficiency. On Novenber 11, 1977, the Chlorine Detector readine l

,,,,, 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 gi, l l i=nediately implemented to assure the surveillance requirements were comoleted. 80

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TOLEDO EDISON COMPANY DA*.*IS-;** S S i~.;1T 03. 3"C'_~M. D.~..Zu ST.".! ION O- SUPPLEMENTAL INFORMATION FOR LER NP-33-78-37

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DATE OF EVEUT: March 25, 1978 FACILITY: Davis-Besse Unit 1 l

IDENTIFICATIONOFOCCURRENCb: Control Room Ventilation Air Intake Chlorine Detec-

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tors' channel check was not being recorded

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

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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."

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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

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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

. 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 4 the required monitoring of the Control Room Air Intake Chlorine Detectors. This l modification was immediately implemented in an attempt to assure the surveillance .

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requirements were co=pleted.

Failure Data: There has been one previous occurrence of a log sheet deficiency causing a failure to complete the surveillance requirement (Licensee Event l

Raport :.?-33-77-05) .

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LER #78-031

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