ML20141B811
| ML20141B811 | |
| Person / Time | |
|---|---|
| Site: | Portsmouth Gaseous Diffusion Plant |
| Issue date: | 06/18/1997 |
| From: | Allen D UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GDP-97-2011, NUDOCS 9706240161 | |
| Download: ML20141B811 (6) | |
Text
I o
y United Stat 2s Enrichraent Corporat:on
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2 Democracy Center 6903 Rockledge Drive Bethesda. MD 20817 l
i Tel: (301)564-3200 Fax: (301) 564-3201 United Slales f.nrirInnent CorlMiraliori i
June 18,1997 i
GDP 97-2011 l
United States Nuclear Regulatory Commission l
Attention: Document Control Desk l
Washington, DC 20555-001 Portsmouth Gaseous Diffusion Plant (PORTS)- Docket No. 70-7002 - Event Report 97-09 l
Pursuant to 10CFR 76.120, (c) (2), Enclosure 1 is the required 30 day written Event Report for an occurrence involving the disabling of the Cascade Automatic Data Processing (CADP) smoke detection system at the Portsmouth Gaseous Diffusion Plant. Enclosure 2 is a list of l
commitmc.'ts made in the report.
l Should you require additional information regarding this event, please contact Scott Scholl at (614) 897-2373.
l Sincerely, OLU 7, Dale Allen l
U General Manager Portsmouth Gaseous Diffusion Plant DIA:SScholl:kpb Enclosures f
cc:
C. Cox/D. Hartland, NRC Resident Inspectors, PORTS i
NRC Region III
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v Di0015 llllllllllllllllll}Illl,lllllll 9706240161 970618 PDR ADOCK 07007002 C
PDR Offices in Paducah, Kentucky Portsmouth. Ohio Washington. DC
United States Nuclear Regulatory Commission-June 18,1997 Page Two Distribution Robert L. Woolley bec:
J. Adkins, HQ J. Anzelmo, PORTS M. Boren, PGDP '
L. Cutlip, PORTS J. Dietrich, LMUS L. Fink, PORTS D. Fosson, PORTS R. Gaston, PORTS M. Hasty, PORTS G. Jones, PORTS J. Labarraque, PGDP B. Lantz, PORTS R. Lipfert, PORTS J. Miller, HQ J. Mize, PGDP s
R. McDermott, PORTS J. Morgan, PORTS A. Rebuck-Main, HQ S. Routh, HQ S. Scholl, PORTS B. Sykes, PGDP R. Wells, HQ K. Whittle, PORTS PORTS Records Management RM: PORTS 97-890-135
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Docket No. 70-7002 Page1of3 Event Report 97-09 Description of Event j
On May 10,1997, at 2005 hours0.0232 days <br />0.557 hours <br />0.00332 weeks <br />7.629025e-4 months <br />, UF detection smokeheads.were deactivated on cell 33-6-6 in 6
the X-333 Process Building while the cell was operating above atmospheric pressure. The
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. Cascade automatic Data Processing (CADP) smoke heads were deactivated when an operator m the X-330 Process Building entered an erroneous command while attempting to deactivate the..
smokeheads in cell 31-3-6 in X-330.
Cell 31-3-6 was offstream for maintenance activities. The CADP system was reporting false alarms from cell 31-3-6, which could be due to dust from maintenance activities or temperature
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changes due to the cell being out of service. Since they were not needed to monitor an operating i
cell, the smokeheads for cell 31-3 6 were declared inoperable on May 19,1997, at' 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, but were not immediately deactivated.
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j Following shift change, an operator was assigned to deactivate the smokeheads. When the operator accessed the CADP terminal system transients were experienced. On the day of this l
incident the plantsite experienced a lightning storm, which may have contribute <l to the system transients. The operator reported that the CADP terminal was blinking on and off. When the -
operator attempted to enter the required data the system was unresponsive. The operator j
attempted to enter the data 5 or 6 times before the entry was successful.
When the operator was successful in accessing the program he typed ".CELLOF". When the i
- CADP program prompted, " ENTER UNIT NAME WHICH CONTAINS THE CELL YOU L
WANT TO ACTIVATE OR DEACTIVATE", the operator entered "X-33-6" instead cf "X-31-3". The operator then entered the cell number "6" and the command to deactivate "ALL" i
smokeheads.
The operator immediately saw that the appropriate lights on the mimic panel had not gone out.
The operator discovered he had entered the wrong cell number and contacted his supervision and the X-333 Building Area control Room (ACR) #1 Operations phrsonnel in ACR-1 had already responded to the loss of the smokeheads and were establishing a smoke atch, as required by the Technical Safety Requirement (TSR), while investigating the cause of tu incident. On May 19, 1997, at 2017 hours0.0233 days <br />0.56 hours <br />0.00333 weeks <br />7.674685e-4 months <br /> the operator re-activated the cell 33-6-6 smoke detectors. Cell 33-6-6 was operated for approximately 12 minutes without CADP coverage.
t Docket No. 70-7002 Page 2 0f 3 Event Report 97-09 s
According to TSR 2.2.3.3 for the Portsmouth Gaseous Diffusion Plant,50% of the CADP smoke detectors are required to be operable when the cell is operating above atmospheric pressure. In this instance, cell 33-6-6 was operating above atmospheric pressure, which would make the loss of all cell smoke detectors reportable in accordance with the 10CFR 76.120 (c) (2).
Initially the Plant Shift Superintendent determined the event was not reportable because the error i
was immediately detected and all TSR requirements for loss of smoke.tector coverage were met. On May 21,1997, after consultation with Nuclear Regulatory Affairs, it was determined the briefloss of smoke detector coverage met the reporting criteria of 10CFR 76.120 (c) (2). The NRC Operations Center was notified of the event on May 21,1997 at 1029 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.915345e-4 months <br />.
There was no failed equipment or release of hazardous material associated with this event.
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Cause of Event The cause for the loss of CADP smokehead coverage of cell 33-6-6, while it was operating above atmospheric pressure, was an operator entry error. The operator entered an incorrect unit designation for the smoke detectors which were to be taken out of service. The operator obtained proper approvals to deactivate the cell 31-3-6 smokeheads. He accessed the ".CELLOF" function. The operator entered unit "X-33-6" instead of"X-31-3". The operator then entered the cell number "6" and the command to deactivate "ALL" smokeheads. An incorrect entry deactivated all the smokeheads in the wrong cell (33-6-6).
Management has initiated the STAR (Stop, Think, Act, Review) program training with the goal
. of preventing occurrences like this through self-checking. Full implementation of this philosophy would have reduced the likelihood that this event would have occurred. In addition, preventing the use of the ".CELLOF" function for deactivating the smokeheads will improve opportunities for operator self-checking before more than 50% of the smokeheads in a cell become deactivated.
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Docket No. 70-7002 Page.3 of 3 Event Report 97-09 Corrective Actions 1.
Training for appropriate operations personnel on use of the STAR (Stop, Think, Act.
Review) program was completed by June 15,1997, 2.
By July 15,1997, Supervision will review the requirements of procedure XP4-CO-CA2245 with the operator involved in this event. The importance of ensuring that only the correct smoke detectors are deactivated will be emphasized during this review.
3.
By July 31,1997, operations will change procedure XP4-CO-CA2245 to prevent the use of the ".CELLOF" function for deactivating smokeheads so that an incorrect entry can be noted on the mimic panel and corrected before more than 50% of the smokeheads in a cell become deactivated.
Extent of Exposure ofIndividuals to Radiation or Radioactive Materials There were no exposures to individuals from this incident to radiation or radioactive materials.
Lessons Learned Operators need to use the principles of the STAR program to properly self-check their work.
l Docket No. 70-7002
- Enclosure 2 l
l Page1of1 i
l Event Report 97-09 l
l List of Commitments l
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1.
By July 15,1997, Supervision will review the requirements of procedure XP4-CO-l CA2245 with the operator involved in this event. The importance of ensuring that only the correct smoke detectors are deactivated will be emphasized during this review.
1 2.
By July 31,1997, operations will change procedure XP4-CO-CA2245 to prevent the use of the ".CELLOF" function for deactivating smokeheads so that an incorrect entry can be noted on the mimic panel and corrected before more than 50% of the smokeheads in a l
cell become deactivated.
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