ML20216B934
| ML20216B934 | |
| Person / Time | |
|---|---|
| Site: | Portsmouth Gaseous Diffusion Plant |
| Issue date: | 02/27/1998 |
| From: | UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | |
| Shared Package | |
| ML20216B933 | List: |
| References | |
| NUDOCS 9803130228 | |
| Download: ML20216B934 (11) | |
Text
- TSR-PORTS PROPOSED February 27,1998 RAC 97X0485 (RO)
SECTION 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES i
[X-700, X-710, X-720, X-760, XT-847]
l l
i i
l
~
- Sa 1888R 3"88F p g
2.8-1 1
TSR-PORTS PROPOSED February 27,1998 RAC 97X0485 (RO)
SECTION 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES l
[X-700, X-710, X-720, X-760, XT-847]
l 2.8.1 OPERATIONAL MODES NONE l
0 1
4 5
2.8-2
- TSR-PORTS PROPOSED February 27,1998 RAC 97XO485 (RO)
SECTIQN 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES l
[X-700, X-710, X-720, X-760, XT-847]
l 2.f.2 SAFETY LIMITS NONE I
4 i
2.8-3
I I
" TSR-PORTS PROPOSED February 27,1998 RAC 97X0485 (RO)
SECTION 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES l
{
[X-700, X-710, X-720, X-760, XT-847]
l 2.8.3 LIMITING CONTROL SETTINGS, LIMITING CONDITIONS FOR OPERATION, SURVEILLANCES 2.8.3.1 Criticality Accident (Radiation) Alarm Systems LCO 2.8.3.la:
Criticality accident detection shall be operable.
APPLICABILITY:
In areas, equipment, or processes which contain greater than 700 23 2
grams of 5U at an enrichment a 1.0 wt% 35U.
ACTIONS:
Condition Required Action Completion Time A.
Areas, equipment, A.1 Discontinue operations with Immediately or processes not fissionable material, covered by AND criticality accident A.2.1 Evacuate area within the area.
Immediately
)
detection.
applicable to the LCO not covered I
by criticality accident detection.
AND A.2.2 Eurict access to area evacuated in A.2.1.
AND A.3 Provide personnel allowed into the Immediately area that would be restricted under Action A.2.1 with an alternate means of criticality alarm notification such as a device that will alarm on sensing a 10mr/hr dose rate.
B.
Areas, equipment, B.1.1 Restore criticality accident Prior to reinitiating or processes not detection by installing portable activities
)
covered by CAAS unit providing required criticality accident-criticality accident detection and detection.
same alarms as fixed unit.
OR B.I.2 Restore criticality accident detection to operable status.
TSR 1.6.2.2d is not applicable.
2.8-4
1 TSR-PORTS PROPOSED February 27,1998 RAC 97X0485 (RO) t SECTION 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES l
)
[X-700, X-710, X-720, X-760, XT-847]
l 2.8.3 LIMITING CONTROL SETTINGS, LIMITING CONDITIONS FOR OPERATION, SURVEILLANCES l
2.8.3.1 Criticality Accident (Radiation) Alarm Systems (continued)
LCO 2.8.3.lb:
Criticality accident alarm shall be operable (audible).
APPLICABILITY:
In areas where the maximum foreseeable absorbed dose in free air exceeds 12 rad.
ACTIONS:
Condition Required Action Completion Time A.
Area does not have an A.1 Discontinue operations with Immediately audible criticality fissionable material, accident alarm.
AND A.2.1 Evacuate area of inaudibility Immediately AND A.2.2 Restrict access to the area of inaudibility.
AND A.3 Provide personnel allowed into the Immediately 1
area that would be restricted under 1
Action A.2.1 with an alternate means of criticality alarm notification such as a device that
]
will alarm on sensing a 10mr/hr dose rate, or a radio in constant
)
communication with the Plant Control Facility.
B.
Area does not have an B.1.1 Restore criticality accident alarm to Prior to audible criticality operable status.
reinitiating j
accident alarm.
activities l
TSR 1.6.2.2d is not applicable.
l I
L t
2.8-5 l
TSR-PORTS PROPOSED February 27,1998 RAC 97X0485 (RO)
SECTIQN 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES l
[X-700, X-710, X-720, X-760, XT-847]
l 2.8.3 LIMITING CONTROL SETTINGS, LIMITING CONDITIONS FOR OPERATION, SURVEILLANCES 2.8.3.1 Criticality Accident (Radiation) Alarm Systems (continued)
J SURVEILLANCE REQUIREMENTS:
i Frequency Surveillance i
Semiannually SR 2.8.3.1.1 Calibrate radiation clusters to i
a set point of 5 mrad /hr. in air.
)
SR 2.8.3.1.2 Verify that the cluster nitrogen horn and X-300 alarm sounds when
.two out of three channels in a cluster are tripped.
Quarterly SR 2.8.3.1.3 Verify nitrogen supply pressure is at least 900 psig for each CAAS 1
horn.
I
' BASIS:
Each cluster consists of three neutron-sensitive detection units. Clusters are designed and calibrated to detect and alarm on a minimum credible criticality accident of concern, defined as producing an integrated total dose of 20 Rads, in one minute at two meters from the reacting material. This system will provide an audible signal in the event of a criticality which will alert personnel to evacuate the immediate work areas. The minimum acceptable length of time for the CAAS horn to sound is 2 minutes. [SAR Section 4.2.2.1,4.6.2.11 l
l i
i 2.8-Sa l
l
- TSR-PORTS PROPOSED February 27,1998 RAC 97X0485 (RO)
SECTION 2.8 SPECIFIC TSRs FOR MISCELLANEOUS FACILITIES I
[X-700, X-710, X-720, X-760, XT-847]
l 2.8.4 GENERAL DESIGN FEATURES NONE l-l l
l l
l
)
2.8-6
GDP98-0028 Page 1 of 4 United States Enrichment Corporation (USEC)
Proposed Certificate Amendment Request Miscellaneous Criticality Accident Alarm Systen.. Facilities -
j Significance Determination The United States Enrichment Corporation (USEC) has reviewed the proposed changes associated with thi.; certificate amendment request and provides the following Significance Determination for I
consideration.
1.
No Significant Decrease in the Effectiveness of the Plant's Safety. Safeguards or Security Programs The placing of additional miscellaneous CAAS facilities under TSR control and the elimination of specific operational modes are not addressed in plant safety, safeguards or security programs contained in the Application for United States Nuclear Regulatory
]
Commission Certification for the Portsmouth Gaseous Diffusion Plant. Therefore, the effectiveness of these programs is unaffected by these changes.
1 2.
No Sionificant Chance to Any Conditions to the Certificate of Como. hance None of the Conditions to the Certificate of Compliance for Operation of Gaseous Diffusion j
Plants (GDP-2) address specific TSRs. Thus, the proposed changes have no impact on any of the Conditions to the Certificate of Compliance.
3.
No Significant Change to Any Condition of the Annroved Comnliance Plan The placing of additional miscellaneous CAAS facilities under TSR control and the elimination of specific operational modes does not alter the Plan For Achieving Compliance with NRC Regulations for the Portsmouth Gaseous Diffusion Plant nor any conditions of the approved compliance plan.
4.
No Significant Increase in the Probability of Occurrence or Conscauences of Previousiv Evalunted Accidents-The placing of additional miscellaneous CAAS facilities under TSR control and the elimination of specific operational modes will not change how the system is operated or the manner in which it is maintained. The operation of the CAAS is not defined as an accident initiator in the SAR analysis and therefore, any changes related to the CAAS will not affect the probability of occurrence of any postulated accident in the SAR. Since the CAAS is viewed as a criticality accident mitigator the addition of these CAAS facilities to the TSR u
4 GDP98-0028 Page 2 of 4 Ur. lied States Enrichment Corporation (USEC)
Proposed Certificate Amendment Request Miscellaneous Criticality Accident Alarm System Facilities Significance Determination will serve to enhance the assurance that the criticality accident alarm will be avai,'able, if required. Therefore, this proposed chage will not increase the probability of occurrence or the consequences of previously evaluated accidents.
5.
No New or Different Type of Accident The operation and maintenance of the CAAS in miscellaneous facilities will remain unchanged from those descriptions currently contained in the SAR. As such, the ability of the CAAS to perform its required function as defined in the SAR, will not be affected by this certificate amendment request. The only changes will be the addition of several miscellaneous facilities to the TSR and the elimination of existing operating modes.
l Therefore, these changes will not create a new or different type of accident nor any new accident initiator or plant configuration that could lead to a new or different type of accident i
than those previously analyzed.
]
6.
No Significant Reduction in Margins of Safety The addition of CAAS facilities to the TSRs and the elimination of specific operational modes will not change how the CAAS in these facilities is operated or the manner in which it is maintained. The proposed change enhances the availability of the CAAS function by l
providing increased application of TSR control over miscellaneous facilities. Therefore, the
)
proposed change will not reduce the margin of safety as currently defimed in the safety analysis report.
7.
No Significant Decrease in the Effectiveness of any Programs or Plans Contained in the Certificate Anplication The TSR change that addresses CAAS facilities is not specifically addressed in any programs or plans contained in the Certificate Application. Therefore, the revision of TSR 2.8 to bring additional CAAS facilities under TSR control and the deletion of operational modes will not decrease the effectiveness of these programs or plans.
i T
GDP98-0028 Page 3 of 4 United States Enrichment Corporation (USEC)
Proposed Certificate Amendment Request Miscellaneous Criticality Accident Alarm System Facilities Significance Determination 8.
The Proposed Changes do not Result in Urwine Risk to 1) Public Health and Safetv. 2)
Common Defense and Security. and 3)"ae Environment.
The consequences of a criticality have only onsite affects based on the whole body dose vs distance from criticality burst as documented in SAR accident analysis, Appendix C, j
Criticality Analysis. The inclusion of these additional facilities in the TSRs will tend to reduce potential consequences from a criticality by providing added assurance that the CAAS in these miscellaneous facilities will be operable upon demand and thereby ensuring.
that local personnel will be notified of the need to evacuate the area. As such, these changes do not result in any undue risk to the public health and safety. In addition, these revisions have no impact on plant effluents or on the programs and plans in place to implement physical security. Consequently, these proposed changes only enhance safety and pose no undue risk to the environment or the common defense and security.
9.
There is no Change in the Tvoes or Significant Increase in the Amounts of any Effluents-that may be Released Offsite.
The consequences of a criticality are confined to plantsite and there will be no changes in the operation of the specified CAAS facilities nor in the manner in which they are maintained. This TSR change has no effect on the generation of effluents and therefore, it does not change the type or amount of effluents that may be released offsite, j
- 10. -
There is no Significant Increase in Individual or Cumniative Occupational Radiation Exoosure.
The consequences of a criticality associated with any postulated accident currently identified in the SAR will not increase as a result of including the additional CAAS monitored facilities. These changes do not increase the probability of a criticality. The TSR change i
does not affect the radiological protection program in place to minimize occupational exposures. Therefore, there is no increase in individual or cumulative occupational radiation exposure as a result of this proposed change.
s GDP98-0028 Page 4 of 4 United States Enrichment Corporation (USEC)
Proposed Certificate Amendment Request Miscellaneous Criticality Accident Alarm System Facilities Significance Determination 11.
There is no Significant Constmetion Imnact.
The placing of miscellaneous CAAS facilities under TSR control and the elimination of specific operational modes will not require a plant modification and therefore will have no construction impact.
12.
There is no Significant Increase in the Potential for Radiological or Chemical Consequences from Previousiv Annivzed Accidents.
The revision of TSR 2.8 will not increase the probability of occurrence or consequences (radiologival and/or chemical) of any postulated accident currently identified in the SAR.
The changes proposed in this certificate amendment request do not alter the assumptions used in the accident analysis. Therefore, there is no significant increase in the potential for radiological or chemical consequences from previously analyzed accidents.
l i
I i
l 1