ML20039A191
| ML20039A191 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/07/1981 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13330A413 | List: |
| References | |
| RTR-NUREG-0452, RTR-NUREG-452 NUDOCS 8112160341 | |
| Download: ML20039A191 (7) | |
Text
o DESCRIPTION OF PROPOSED CHANGE AND SAFETY ANALYSIS PROPOSED CHANGE NO.106 TO THE TECHNICAL SPECIFICATIONS PROVISIONAL OPERATING LICENSE DPR-13
-This is a request for revision of Appendix A, Technical Specifications, and to amend the license thereby.
Reason for Proposed Change There is an inconsistency between 4.8A and 6.9.2.a(4) of the Technical specifications relative to the reportable occurrences of 1) a reactivity anomaly and 2) an unplanned reactivity insertion.
Existing Specifications The existing specifications are as constituted in Appendix A, Technical Specifications, Section 6.9.2.a(4) Reportable Occurrences - reactivity.
Occurrences of these reactivity lower limits are reportable: a reactivity anomaly of $1.00 and an unplanned reactivity insertion of 50(.
Proposed Specifications The proposed specifications are those of NUREG-0452, Revision 3 Standard i
Technical Specifications for Westinghouse Pressurized Water Reactors. These values for prorpt reporting are 1% for reactivity anomalies and 0.5% for unplanned reactivity insertion.
New Section 6.9.la(4) is shown in the enclosure.
Safety Analysis The proposed changes are to the lower limits at which prompt reports to the Commission are initiated and will match the guidelines of Section 6.9.1.8 of NUREG-0542 Revi sion 3.
No changes are being made to operational margins.
Based upon the analysis provided above, it is concluded that (1) the proposed change does not involve an unreviewed safety question as defined in 10CFR50.59, nor does it present significant hazards considerations not described or implicit in the Final Safety Analysis, and (2) there is reasonable assurance that she health and safety of the public will not be endangered by the proposed change.
8112160 W
- ENCLOSURE 6.9.2 Reportable Occurrences
.a.
Pronet Notification With Written Follow-up (4) Reactivity anomalies involving disagreement with.the predicted value of reactivity balance under steady state conditions during power operation greater than or equal to -$1300- 1% (delta k)/k; a calcu-lated reactivity balance indicating a shut-down margin less conservative than speci-fied in the technical specifications; short-term reactivity increases that correspond to a reactor period of less than 5 seconds or, if subcritical, an unplanned reactivity insertion of more than -50t- 0.5% (delta k)/k l
or occurrence of any unplanned criticality.
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o DESCRIPTION OF PROPOSED CHANGE AN9 SAFETY ANALYSIS PROPOSED CHANGE NO. 107 TO THE TECHNICAL SPECIFICATIONS PROVISIONAL OPERATING' LICENSE OpR-13 This is a request to revise Appendix A Technical Specification 3.0 Limiting Conditions for Opereration (General).
Reason for Proposed Change Technical Specification 3.0 became effective on June 11, 1981 with the issuance of Amendent No. 56 to the San Onofre Unit 1 Operating License. The issued version of the General Limiting Conditions for Operation (LCO) was based on the model specification transmitted by the NRC in their letter dated April 10,1980 which included the then existing General LCO of the Standard Technical Specification for Westinghouse Pressurized Water Reactors (STS)
Revision 2.
Revision 3 of the STS was issued in September,1980 and included a revised General LC0 which allows more time for operator response to events which place the station in an operational state outside the bounds allowed in LCOs or Action statements. The purpose of this proposed change is to make Technical Specification 3.0 consistent with Revision 3 of the STS.
Existing Specification Technical Specification 3.0 currently reads,.in part, as shown in Enclosure 1.
Proposed Specification Technical Specification 3.0 would be revised to read, in part, as shown in.
The balance of Technical Specification 3.0 would remain as cnnstituted in Appendix A to Provisional Operating License No. DPR-13.
Safety Analysis Proposed Change No.107 revises the San Onofre Unit 1 Technical Specifications to be consistent with Revision 3 of the STS.
These revision are therefore consistent with the presently accepted philosophy on operator response to events which place the station in a mode which is not allowed by the Technical Specifications.
The increased response time allows for a more orderly shutdown of the unit without impacting safety.
Accordingly, it is concluded that (1) the proposed change does not involve an unreviewed safety question as defined in 10CFR50.59, nor does it present significant hazards considerations not described or implicit in the Final Safety Analysis, and (2) there is reasonable assurance that the health and safety of the public will not be endangered by the proposed change.
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e ENCLOSURE 1 30 LIMITING CDNDITIONS FOR OPERATION (GENERAL)
Applicability: Applies to the operational requirements to be implemented when specific actions are not identified within individual Limiting Conditions for Operation.
Objective:
To ensure that the station is placed in a safe condition when circumstances arise which are not identified within individual Limiting Conditions for Operation.
Specification :
A.
In the event a Limiting Condition for Operation and/or associated Action requirements cannot be natisfied because of circumstances in excess of those addressed in the specification, the unit shall be placed in at least Hot Standby within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, and in at least Cold Shutdow. within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> unless corrective measures are completed that permit operation under the permissible Action statements for the specified time interval as asasured from initial discovery or until the reactor is placed in a mode of operation in which the specification is not applicable. Exceptions to these requirements shall be stated in the individual specifications.
B.
When a system, subsystem, train, component or device is determined to be inoperable solely because its emergency power source is inoperable, or solely because its normal power source is inoperable, it may be considered Operable for the purpose of satisfying the requirements of its applicable Limiting Condition for Operation, provided:
(1) its corresponding normal or emergency power source is Operable, and (2) all of its redundant system (s),
subsystem (s), train (s), component (s), and device (s) are Operable, or likewise satisfy the requiremente of this specification. Unless both conditicris (1) and (2) are satisfied, the unit shall be placed in at least Hot Standby within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, and in at least Colo Shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Tnis specification is net applicable during the Cold Shutdown or Refueling modes of operation.
Basis:
Specification A delineates the action to be taken for circumstances not directly provided for in the Action statements and whose occurrence would violate the intent of the specification. For example, Technical Specifica-tion 3 3 requires in part that two recirculation pumps be Dperable in ordef for the reactor to be made or anintained critical and provides explicit action requirements if one recirculation pump is inoperable.
Under the terms of Specification A, if more than one recirculation pump is inoperable, the unit is required to be in at least Hot Standby within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and in at
o least Cold Shutdown within 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> unless corrective measures are cospleted. It is assumed that the unit is brought to the required mode of operation within the required times by promptly initiating and carrying out the appropriate action statement.
Specification B delineates what additional conditions must be satisfied to permit operation to continue, consistent with the Action statements for power sources, when a normal or emergency power source is not Ope rable. It specifically prohibits operation when one division is inoperable because its normal or emergency power source is inoperable and a system, subsystem, train, component, or device in another division is inoperable for another reason.
The provisions of this specification permit the Action statements associated with individual systems, sub-systems, trains, components, or devices to be consistent with the Action statements of the associated electrical It allows operation to be governed by the power source.
time limits of the Action statement associated with the Limiting Condition for Operation for the normal or emerency power source, not the individual Action state =ents for each system, subsystem, train, component or device that is determined to be inoperable solely because of the ineperability of its normal or emergency power source.
For exa:ple, Specification 3 7 requires that two emergency diesel generators be Operable. The Action statement provides for a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> out-of-service time when one emergency diesel generator is not Operable.
If the definition of Operable were applied without con-sideration of Specification B, all systems, subsystems, trains, components and devices supplied by the inopera-ble emergency power source would also be inoperable.
This would dictate invoking the applicable Action state =ents for each of the applicable Limiting Conditions for Operation. However, the provisions of Specification B permit the time limits for continued operation to be consistent with the Action statement for the incperable esergency diesel generator instead, provided the other specified conditions are satsified.
In this case, this would mean that the correspending ncrtal power source must be Operable, and all redundant syste=s, subsystems, trains, cc:penents and devices must be Operable, or otherwise satsify Specification B (i.e.,
be. capable of perfor ing their design function and have at least one normal or one e ergency power source Ope-able). If they are not satisfied, shutdown is required in accordance with this specification.
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ENCLOSURE 2 3.0 LIMITING CONDITIONS FOR OPERATION (GENERAL)
Applicability: Applies to the operational requirements to be implemented when specific actions are not identified within individual Limiting Conditions for Operation.
Objective:
To ensure that the station is placed in a safe condition when circumstances arise which are not identified within individual Limiting Conditions for Operation.
Specification:
A.
When a I.imiting Condition for Operation is not met, except as provided in the associated ACTION requirements, within one hour action shall be initiated to place the unit in a M09E in which the Specification does not apply by placing it, as applicable, in:
1.
At least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, 2.
At least HOT SHUTDOWN within tne following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and 3.
At least COLD SHUTDOWN within the subsequent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Where corrective measures are completed that permit operation under the ACTION requirements, the ACTION may be taken in accordance with the specified time limits as measured from the time of failure to meet the Limiting Condition for Operation.
Exceptions to these requirements are stated in the individual Specifications.
B.
When a system, subsystem, train, component or device is determined to be inoperable solely because its emergency power source is inoperable, or solely because its normal power source is inoperabic, it may be considered OPERABLE
'for the purpose of satisfying the requirements of its applicable Limiting Condition for Operation, provided:
(1) its corresponding normal or emergency powar source is OPERABLE; and (2) all of its redundant system (s),
subsystem (L), train (s), component (s), and device (s) are OPERABLE, or likewise satisfy the requirements of this specification. Unless both conditions (1) and (2) are satisfied, within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> action shall be initiated to place the unit in a MODE in which the applicable Limiting Condition for Operation does not apply by placing it as applicable in:
1.
At least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, 2.
At least HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and 3.
At least COLD SHUTDOWN within the subsequent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
This Specification is not applicable in MODES 5 or 6.
i Basis:
Specification A delineates the action to be taken for i
circumstances not directly provided for in the Action statements and whose occurrence would violate the intent of
o the specification.
For example Technical Specification 3.3 requires in part that two recirculation pumps be Operable in order for the reactor to be made or maintained critical and provides explicit action requirements if one recirculation pump is inoperable.
Under the terms of Specification A, if more than one reciraulation pump is inoperable, action shall be initiated within one hour to place the unit in at least Hot Standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, at least Hot Shutdown within.
j the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in at least Cold Shutdown withing i
the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> unless corrective measures are compl eted.
It is asstsned that the unit is brought to the required mode of operation within the required times by promptly initiating and carrying out the appropriate action statement.
Specification 8 delineates what additional conditions must be satisfied to permit operation to continue, consistent with the Action statements for power sources, when a normal or emergency power source is not Operable.
It specifically prohibits operation when one division is inoperable because its normal or emergency power source is inoperable and a system, subsysts, train, component, or device in another division is inoperable for another reason.
The provisinns of this specification permit the Action statements associated with individual systems, subsystems, trains, components, or devices to be consistent with the Action statements of the associated electrical power source.
It allows operation to be governed by the time limits of the Action statement associated with the Limiting Condition for Operation for the norml or emergency power souce, not the individual Action statements for each system, subsystem, train, component or device that is determined to be inoperable solely because of the inoperability of its normal or emergency power source.
For example, Specification 3.7 requires that two emergency diesel generators be Operable.
The Action statement provides for a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> out-of-service time when one emergency diesel generator is not Operable.
If the definition of Operable were applied without consideration of Specification B, all systems, subsystems, train, components and devices supplied by the inoperable emergency powar source would also be inoperable.
This would dictate invoking the applicable Action statements for each of the applicable Limiting Conditions for Operation.
However, the provisions for Specification B permit ue time limits for continued operation to be consistent with the Action statement for the inoperable emergency diesel generator instead, provided the other specified conditions are satisfied.
In this case, this would mean that the corresponding normal power source must be Operable, and all redundant systems, subsystems, trains, components and devices must be Operable, or otherwise satisfy Specification B (i e.,
be capable of performing their design function and have at least one norml or one emergency power source Operable).
If they are not satisfied, shutdown is required in accordance with this specification.
o