ML19256B628
| ML19256B628 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/07/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Jeffery Grant TOLEDO EDISON CO. |
| References | |
| NUDOCS 7908150384 | |
| Download: ML19256B628 (1) | |
Text
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'o, UNITED STATES NUCLE AR REGULATORY COMMISSION
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AUG 7 1979 Docket No. 50-346 Toledo Edison Company ATTN:
Mr. James S. Grant Vice President - Energy Supply Edison Plaza 300 Madison Avenue Toledo, 011 43652 Ger.t l emen :
The enclosed IE Bulletin No. 79-18 is forwarde<' to you for action.
A written response is required.
If you desire afditional information regarding this matter, please contact this office.
Sincerely, AN James G. Kepp er Director Enclosure IE Bulletin No. 79-18 cc w/ encl:
Mr. T. Murray, Station Superintendent Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC liarold W. Kohn, Power Siting Commission llelen W. Evans, State of Ohio 7 908150W -
Accessions No: 7908030403 SSINS No: 6820 UNITED STATES NUCLEAR RECULATORY COliMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 7, 1979 IE Stilstin No. 79-18 AUDIBILITY PROBLEMS ENCOUNTERED ON EVACUATION OF PERSON:It, AREAS
._0M BIGB-NOISE Description of Circumstances:
In January 1979, a number of licensee personnel were engaged in routine activities in the auxiliary building at the Florida Power Corporation, Crystal River Unit 3 nuclear plant.
While these individuals were working in the auxiliary building, in a high-noise (fan) area, an unplanned release of radio-active noble gases was detected by building monitors within the auxiliary building at concentrations which caused the licensee to initiate the facility emergency plan auxiliary building evacuation procedure. The facility Emer-gency Officer (Thift Supervisor) assessed the monitor readings and inP iated an auxiliary building evacuation. The evacuation announcement, made over the licensee's PA system, was not heard by the personnel working in the high-noise Licensee personnel did evacuate the auxiliary building upon observing area.
that other personnel had left, if an evacustion had been initiated.and af ter calling the control room to inquire During these occurrences, licensee personnel were not exposed to quantities of radionuclides above regulatory guidance.
However, the potential existed for inadvertent unnecessary exposure of individuals to radioactive materials.
Subsequent to the NRC follovup inspection of this occurrence, Florida Power Corporation initiated an assessment of this situation and performed an engineering evaluation and identified several plant areas where the annun-ciator system needed audibility improvement. The licensee has installed a new auxiliary building evacuation tone signal and may add vi.sual alarm indi-cators in areas of very high-noise.
Action to be Taken by the Licensees:
For all power reactor facilities with an operating license:
1.
Determine whether current alarm systems and evacuation announcement syste:rc are clearly audible or visible throughout all plant areas with emphasis on high-noise areas.
Determination in high noise armas must be made with the maximum anticipated noise level.
DUPLICATE DOCUMENT E" fred sys em under ANO N o.
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