ML20054L570

Ro:On 820610,review of Documentation Associated W/Control Room Fire Protection Computer CRT Revealed That Sys Had Been Out of Svc for Approx 3-h on 820419.Condition Determined Not RO

ML20054L570
Person / Time
Site:	San Onofre
Issue date:	06/23/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8207080255
Download: ML20054L570 (2)

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H. B. H A Y s rettpso~e wano~-~.., June 23, 1982 m m im U. S. Nuclear Regulatory Correnission 7

Office of inspection and Enforcement

,Regica V -

1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 -

Attention: ' Mr R. H. Engelken, Regional Administrator

Subject:

Docket No. 50-361 Cancellation of Reportability Licensee Event Report No.82-072 San Onofre Nuclear Generating Station Unit 2 '

Re f eren::e: Facsimile Transmission, H.B. Ray (SCE) to R.H..Engelken

'(NRC), Written Confirmation of Prompt Report involving inoperable. Fire Protection Computer, dated June 10, 1982 i

The correspcodenc'a ref erenced above conf irmed the prompt telephone notification to Segion V of an event involving inoperab!e Fire Protection Computer hardwarg at San Onofre Unit 2. The 3noperability of the Fire Protection Cc:aputer,Ca 'hode Ray Tube (CET) display in the Control Room was initially determined to be reportable in accordance with Appendix A Technical Speci tication 6.9.1.12. I to Operating License t!PF-10.

l On June 10, 1982, y review of documentatior, associated with the Control Room Fire Protec1 ion Computer CRT r evealed that The CRT had been out of service for a period at approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> on March 19, 1982. Prelim-inary investigation indicated that with the CRT inoperable, fire detection and fire suppression system actuation would still be accomplished, but no annunciation of actuation would occur in the Control Room. The above referenced prompt report was made based on the determination that such a deficiency would result in fire protection systems performance in a manner less conservative than that assumed in the Fire Hazards Analysis.

Immediate operator awareness of the location of a fire is a basic assump-tion for the prompt dispatch of The Fire Brigade.

Further investigation has determined, however, that even with the Fire Protection Computer CRT inoperable, annunciation of fire detection and fire suppression system actuation would occur in the Control Room and the identif ication of detectors or systems actuated would be made on both the backup CRT and on the alarm printer in the CAS and computer room respectively, provided the computer itself remained operable.

Prompt dispatch of the Fire Brigade is assured under these conditions.

8207080255 820623 PDR ADOCK 05000361 S PDR pg

Mr. R. H. Engelken June 23, 1982 Thus, it has been determined that loss of the Control Room Fire Protection Computer CRT would not by itself result in operation of the Unit in a manner less conservative than that assumed in the Fire Hazards Analysis and is, therefore, not a reportable occurrence. The prompt reporting status of this incident and Licensee Event Report No.82-022 are hereby cancelled. No.82-022 will not be reused in future LER correspondence.

If there are any questions regarding the above, please contact me.

Sincerely, s

cc: A. Chaffee (USNRC Resident inspector, San Onofre, Unit 2)

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