ML17146A293
| ML17146A293 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 03/07/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17146A292 | List: |
| References | |
| NUDOCS 8603140455 | |
| Download: ML17146A293 (3) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO.
TO FACILITY OPERATING LICENSE NO. NPF-14 AND AMENDMENT NO. 23TO FACILITY OPERATING LICENSE NO.
NPF-22 PENNSYLVANIA POWER AND LIGHT COMPANY SUS UEHANNA STEAM ELECTRIC STATION UNITS I AND 2 DOCKET NOS. 50-387 AND 50-388
1.0 INTRODUCTION
On November 26, 1985, the Pennsylvania Power and Light Company requested a
change to the Unit I and Unit 2 Technical 'Specifications.
Additionally, PP8L requested a change specific to Unit 2.
The first change, which effects both units would change specification 3.8.3.1 and 3.8.3.2 by more clearly identifying certain motor control centers (480 volt A.C. MCC's) and instrument panels (Load Group 208/120 volt A.C. instrument panels) as separate load groups.
These MCC's and instrument panels are powered by specific 480-volt and 120-volt divisionalized busses (SSES has a four division system electrical design).
The change groups these MCC's and instrument panels under their associated power channels.
This change will allow the MCC's and instrument panels to be identified as other load groups have always been identified in the past.
The licensee's requested change is in conformance with the standard Technical Specifications.
The second change requested by the licensee is specific to Unit 2 specification 3.8.3. 1 and its appropriate action statement.
The requested change will allow a required Unit I and common A.C. distribution load group to be de-energized for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> outage time has been changed from the original allowed outage time of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
2.0 EVALUATION The staff finds the first change to be acceptable as it is administrative in nature and improves the clarity of the Unit I and Unit 2 Technical Specifications.
The second change requested by the licensee, specific to Unit 2, has also been found to be acceptable based upon the staff's evaluation which follows.
In the Susquehanna design for A.C. power distribution the Unit 1 4KV busses feed the Unit I loads and equipment which supports loads common to Unit I and Unit 2.
The Unit 2 4KV busses feed the Unit 2 loads but are not capable of feeding loads common to both Units I and 2.
Since the Unit I 4KV busses feed the common loads for Units I arid 2, the Unit I 4KV busses have been included in the Unit 2 Technical Specifications.
The licensee s
requested change allows Unit 2 to operate for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after losing a Unit I and common load group.
This change does not affect or change the requirement for Unit 2 to shutdown within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> upon the loss of a Unit 2 8bp3P7 8b
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load group or the requirement for Unit 1 to shutdown within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> upon the loss of a Unit I and common load group.
The staff has reviewed the licensee's justification and finds that the most limiting condition for operation which could occur from de-energizing one of the load groups (a load group is defined as the loads supported by a 4KV bus both directly and through the load centers and MCC's) is the loss of one loop of ESW because of the loss of power to its discharge
- valve, and the loss of a diesel generator.
The time period presently allowed in the Technical Specifications as an outage time for either of these events is 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The de-energizing of one A.C. distribution system load group has a safety impact that is no greater than the impact on plant operations when one diesel generator and/or one ESW loop is lost.
The loss of one diesel gener-ator and/or the loss of an ESW loop is analyzed in the FSAR.
The staff presently finds it acceptable to allow 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 for an inoperable diesel generator and/or an inoperable loop of ESW.
This change is commensurate with this time limitation.
The licensee has stated that this change does not impact the safety of plant operation since this change only results in a loss of equipment for a previously determined allowable time.
The staff agrees with the licensee's determination.
Additionally, this change is consistent with the bases of the Technical Specifications which states that action requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation.
The operability of the power sources are consistent with the initial-condition assumptions of the accident analysis in the FSAR.. Therefore, the allowable time for which a Unit I and common load group may be inoperable is 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> since this is commensurate with the inoperability of a diesel generator and/or an ESW loop.
3.0 ENVIRONMENTAL CONSIDERATION
These amendments involve a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
The staff has determined that these amendments involve no significant increase in the
- amounts, and no significant change in the types, of any effluents that may be released offsite and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a proposed finding that these amendments involve no significant hazards consideration and there has been no public comment on such finding.
Accordingly, these amendments meet the eligibilitycriteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement nor environmental assessment need be prepared in connection with the issuance of these amendments.
4.0 CONCLUSION
The Commission made a proposed determination that these amendments involve no significant hazards consideration which was published in the Federal Re ister (51 FR 1878) January 15,
- 1986, and consulted with the State orr>coney van>a.
No public comments were received, and the State of Pennsylvania did not have any comments.
The staff has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed
- manner, and (2) such activities will be conducted in compliance with the Commission s regulations and the issu-ance of these amendments will not be inimical to the common defense and security nor to the health and safety of the public.
Principal contributors:
H. J.
Campagnone,
- PD83, DBL.
S.
C.
Rhow, EICSB, DBL.
Dated: ++
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