ML20216C201
| ML20216C201 | |
| Person / Time | |
|---|---|
| Site: | Paducah Gaseous Diffusion Plant |
| Issue date: | 03/05/1998 |
| From: | John Miller UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | Paperiello C NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| GDP-98-0041, GDP-98-41, NUDOCS 9803130324 | |
| Download: ML20216C201 (14) | |
Text
.
ep l-USEC 9
A Global Energy Company March 5,1998 GDP 98-0041 Dr. Carl J. Paperiello Director, Office of Nuclear Material Safety and Safeguards Attention: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Paducah Gaseous Diffusion Plant (PGDP)
Docket No. 70-7001 Request for Enforcement Discretion - Response to NRC Request for Additional Information
Dear Dr. Paperiello:
On Februz.ry 25, 1998, USEC requested enforcement discretion associated with the potential consequences of postulated seismically-induced failures in the liquid withdrawal facilities (USEC letter GDP 98-0031). NRC requested a conference to discuss technical questions on the Justification for Continued Operation (JCO) included in the Request for Enforcement Discretion. USEC representatives met with NRC on March 3,1998, to discuss these questions. During this meeting.
NRC asked for specifi.: information by close of business on March 5,1998, on USEC's control of inventory in the subject facilities. Per NRC's request, Enclosure 1 to this letter is USEC's response to those questions.
i Should you have any questions regarding this matter, please contact Larry Jackson at (502) 441-6796. Commitments contained in this submittal are identified in Enclosure 2.
Sincerely, S. A.
I 1
h James H. Miller Vice President - Production f
t
Enclosures:
1.
USEC Response to NRC Request for Additional Information 2.
Commitments Contained In This Submittal l
l cc: NRC Document Control Desk NRC Region III Office llllllll*ll}*lll*ll*llllll NRC Resident Inspector - PGDP Mr. Robert C. Pierson (NRC)
Mr. Randall M. DeVault (DOE)
MAR 09 Y 6903 Rockledge Drive. Bethesda MD 20817-1818 m..
Telephone 301-564-3200 Fax 301-564-3201 http://www.usec.com nuu06 om< con uvermore. ca iwcas. xv rettsmouis. os wassiogteo. Dc 9803130324 980305 PDR ADOCK 07007001 R
J DR
i iDP 98-0041 Page1of3 l
L Response to NRC_ Request for Additionni Information j
on Paduenh Seismic JCO l
NRC Question (3/3/98 Meeting)
USEC's accumulator limits and compensatory actions for controlling inventory in C-310/C-310-A and C-315 are inadequate. Provide ncw limits and actions to further reduce the amount of material available for release. Calculate the resulting uranium intake as a function of distance to the north and east.
i
Response
USEC will implement the administrative controls listed in Table 3 to limit the consequences of the j
postulated seismically induced condenser, piping, and accumulator failures in Buildings C-310/310-A and C-315. The following intakes would occur for receptors at the site boundary to the east and to the north (see Tables 1 and 2, respectively).
Table 1 East Site Boundarv Uranium Intakes C-310/
C-315 C-310-A 2,000 lb in accumulators and 1,500 lb in 14 mg U condensers at C-310/C-310-A 5,000 lb in accumulator and 2,000 lb in 42 mg U condensers in C-315 4,000 lb in accumulators and 1,500 lb in 22 mg U condensers at C-310/C-310-A 10,000 lb in accumulator and 2,000 lb in 65 mg U condensers in C-315 k
l
)
L GDP 98-0041 Page 2 of 3 Table 2 North Site Roundary IJranium Intaka l
C-310/
C-315 l
C-310-A' 2,000 lb in accumulators and 1,500 lb in 14 mg U condensers at C-310/C-310-A L
5,000 lb in accumulator and 2,000 lb in 23 mg U condensers in C-315 4,000 lb in accumulators and 1,500 lb in 21 mg U condensers at C-310/C-310-A 10,000 lb in accumulator and 2,000 lb in 36 mg U condensers in C-315 i
L Figures 1 through 8 show the uranium intakes for receptors out to 9,000 m (approximately five miles) from the release points. Building C-315 was used as a common point of origin for all downwind
- I receptor locations. Note that for receptor locations within 500 meters of the release point, there is lower confidence in the validity of the results based on the software validation.
Administrative I.imits and Controls for Accumulntnr IIF Inventnry for C-310/310-A nnd C-315 1
In addition to the compensatory actions identified in the' Justification for Continued Operation (Enclosure 2 to GDP 98-0031), the following additional actions will be taken to limit accumulator inventory in C-310/310-A and C-315. [These additional actions replace those that were included in the Response to NRC Request for Additional Information (GDP 98-0036).] These actions are being taken j
based on consequence analysis of the postulated seismic failures. Once risk analysis associated with the seismic event of concern for C-310/310-A and C-315 is completed, actions which are risk-based as opposed tojust consequence-based may be proposed. For the interim, the limits proposed below will ensure that the consequences of the postulated seismic failures are less then the SAR accident analysis for the ruptured liquid cylinder (outdoors).
During the period in which operation under this JCO is authorized, the amount of UF stored in the C-6 j
u 310/310-A and C-315 accumulators will be kept below a nominal 2,000 lb UF and 5,000 lb UF 6
6 respectively during normal operation. In cases of abnormal operation, the levels will not be allowed to exceed 4,000 lb UF in the C-310/C-310-A accumulators and 10,000 lb UF in the C-315 f
accumulator. The amount being stored in the accumulators will be based on best estimates using 6
6 withdrawal rate information since calibrated level indicators or load cells are nct available. The accuracy of this method of monitoring inventory is sufficient to provide confidence that the calculated l
l l
3
I GDP 98-0041 Page 3 of 3 intakes are not exceeded. The following actions will be implemented through Long Term Orders as soon as possible but no later than 7:00 p.m. CST on Friday, March 6,1998.
Table 3 Administrative Limits and Controls for Accumulntnr IJF Invectory for C-310/310-A nnd C-315 Condition Required Action Completion Time Diverting flow to the 1.
Notify the PSS of accumulator Immediately accumulator in C-310-A or usage.
C-315 for greater than one 2.
Begin tracking of quantities by hour (nominal 2,000 and using calculated withdrawal rates.
5,000 lb UF respectively at 3.
PSS initiate high priority actions for one hour )
timely resolution of unscheduled outages.
4.
Cascade Coordinator takes actions to reduce tails downflow and/or product or tails withdrawal rates to minimize accumulator use as appropriate.
5.
Notify NRC.
Calculated accumulator 1.
Stop diverting flow to the affected immediately inventory reaches 4,000 lb accumulator.
UF. in C-310-A or 10,000 lb UF in C-315.
i
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GDP 98-0041 Page1ofI COMMITMENTS CONTAINED IN THIS SUBMITTAL 1.
During the period in which operation under this JCO is authorized, the amount of UF stored 6
in the C-310/310-A and C-315 accumulators will be kept below a nominal 2,000 lb UF and 5,000 lb UF, respectively during normal operation. In cases of abnormal operation, the levels will not be allowed to exceed 4,000 lb UF in the C-310/310-A accumulators and 10,000 lb UF.
6 in the C-315 accumulator. The amount being stored in the accumulators will be based on best-estimates using withdrawal rate information since calibrated level indicators or load cells are not available. The accuracy of this method of monitoring inventory is sufficient to provide
- confidence that the calculated intakes are not exceeded. The following actions will be implemented through Long Term Orders as soon as possible but no later than 7:00 p.m. CST on Friday, March 6,1998.
Administrative I imits and Contmls for Accumulntnr IIF Inventnrv for C-310-A and C-315 Condition Required Action Completion Time Diverting flow to the 1.
Notify the PSS of accumulator Immediately accumulator in C-310-A or usage.
C-315 for greater than one 2.
Begin tracking of quantities by hour (nominal 2,000 and using calculated withdrawal rates.
5,000 lb UF. respectively at 3.
PSS initiate high priority actions for one hour i timely resolution of unscheduled outages.
4.
Cascade Coordinator takes actions to reduce tails downflow and/or prodat or tails withdrawal rates to minimize accumulator use as appropriate.
5.
Notify NRC.
Calculated accumulator 1.
Stop diverting flow to the,affected Immediately inventory reaches 4,000 lb accumulator.
UF in C-310 or 10,000 lb 6
UF in C-315.
6