ML20248M321
| ML20248M321 | |
| Person / Time | |
|---|---|
| Site: | Paducah Gaseous Diffusion Plant |
| Issue date: | 06/12/1998 |
| From: | Pulley H UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GDP-98-1043, NUDOCS 9806150293 | |
| Download: ML20248M321 (3) | |
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CSEC
. A cio6.i so.rsy comp.or June 12,1998 GDP 98-1043 United States Nuclear Regulatory Commission -
Attention: Document Control Desk Washington, DC 20555-0001 Paducah Gaseous Diffusion Plant (PGDP) i f
Docket No. 70-7001 Event Report ER-98-13 j
Pursuant to 10CFR76.120 (c)(2), enclosed is the required 30-day written Event Report covering the partial failure of the plant air system when two air compressors in Building C-335 tripped.
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The Nuclear Regulatory Commission (NRC) was notified of the event on May 14,1998, at 1653 hrs. (NRC No. 34236). An evaluation of the cause for the trips and recommended corrective-actions is continuing. A revised report is planned for submission by July 10,1998.
Any questions regarding this matter should be directed to Larry Jackson at (502) 441-6796.
Sincerely, o
Pulley General Manager Paducah Gaseous Diffusion Plant
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Enclosure:
As Stated cc: NRC Region III Office L
NRC Resident Inspector - PGDP p{
9906150293 990612 PDR ADOCK 07007001 C
PDR P.O. Box 1410, Paducah, KY 42001 Telephone 502-441-5803 Fax 502-441-5801 http://www.usec.com Offices in Livermore, CA Paducah, KY. Portsmouth, OH Washington, DC i
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i Docket No.- 70-7001 GDP 98-1043 Page1of2 l
EVENT REPORT ER-98-13 DESCRIPTION OF EVENT i
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On May 14,1998, at 0901 hrs., a partial failure of the pleat air system occurred when two air compressors in Building C-335 tripped off-line. The partial failure of the plant air system caused '
the Criticality Accident' Alarm System (CAAS) to be declared inoperable, due to reduced air capacity: determined to be potentially required for the CAAS building horns. CAAS alarm
' capabilities supplied by plant air were declared inoperable due to inaudibility; however, CAAS
' detectability was not affected.' Restart of the compressors occurred while Limiting Conditions for Operations (LCO) actions, as required by Technical Safety Requirements (TSR), were being l
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. determined; therefore, LCO actions were not initiated. On May 14,1998, at 1653 hrs., the Nuclear l
--Regulatory Commission. Headquarters (NRC-HQ) office was notified of this event in accordance with 10CFR76.120(c)(2) (NRC Event 34236).
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. Dry compressed air is required at'the PGDP to operate pneumatic instruments, controllers and valves L
- for plant processes. Air is also used for plant support production operations, steam plant operations:
test facilities and maintenance functions. Dry compressed air is supplied from three buildings (C-600, -620, -335) and an auxiliary air supply is located in Building C-607. Air compressor i
- facilities may.be operated separately or together to maintain air supply to the distribution headers.
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1 Dry compressed air is also used as the primary motive force to sound CAAS building horns. The 1
requirements for compressed air capacity relative to the CAAS requirements have been assessed in L
Engineering-Notice (EN) EN-C-822-98-027, Rev. O, effective April 3,1998. Plant -Utility Operations issued Long Term Order (LTO) C600-98-01, Rev. 2, dated May 5,1998, to assure the initial conditions of the EN, including CAAS operability, are maintained. The LTO defines the expectation for on-line plant air availability to be maintained 'at, or above,11,250 scfm.
L On May 14,1998, at approximately 0850 hrs., a Centac compressor in Building C-335 tripped,
' discontinued operating and was manually restarted in less than one minute. At approximately 0900 l:
- hrs., the same Centac tripped a second time and was immediately restarted. At approximately 0927 hrs., an' XLE compressor tripped, discontinued operations, and was manually restarted after approximately three minutes. However, the Centac compressor trip reduced plant air vallability s
- to le'ss than 11,250 scfm.
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I Docket No. 70-7001 GDP 98-1043 Page 2 of 2 CAUSE OF THE EVENT A. Direct Cause Being Evaluated i
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