ML17306B032
| ML17306B032 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/01/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17306B031 | List: |
| References | |
| NUDOCS 9210130248 | |
| Download: ML17306B032 (6) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION 9210130248 921001 PDR ADOCK 05000528 P
PDR 5
SAFETY EVALUAT ON BY TH OFF C
OF NUCLEAR R A TOR REGULATION ELAT D TO M NDM NT NO.
65 TO CI ITY OP RATING NS NO.
NPF-41 AMENDMENT NO. 5i TO FACILITY OPERATING LICENSE NO.
NPF-51 AND AMENDMENT NO.
38 TO FACILITY OPERATING LICENSE NO. NPF-74 ARIZONA PUBLIC SERVICE COMPANY E
AL.
PALO VERDE NUCLEAR GENERATING STATION UNIT NOS.
1 2
AND 3 DOCKET NOS.
STN 50-528 STN 50-529 AND STN 50-530
- 1. 0 INTRODUCTION By letter dated April 27, 1992, the Arizona Public Service Company (APS or the licensee) submitted a request for changes to the Technical Specifications (TS) for the Palo Verde Nuclear Generating Station, Units 1, 2, and 3 (Appendix A to Facility Operating License Nos.
NPF-41, NPF-51, and NPF-74, respectively).
The Arizona Public Service Company submitted this request on behalf of itself, the Salt River Project Agricultural Improvement and Power District, Southern California Edison
- Company, El Paso Electric Company, Public Service Company of New Mexico, Los Angeles Department of Water and Power, and Southern California Public Power Authority.
The proposed changes would revise the allowable out-of-service time for one train of Essential Chilled Water System from 7 days to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
- 2. 0 EVALUATION The Essential Chilled Water System (ECWS) is used to provide safety-related room cooling for the control room, the Engineered Safety Feature (ESF).
switchgear
- rooms, the battery rooms, the remote shutdown rooms, the DC equipment
- rooms, the electrical penetration
- rooms, and the ESF pump rooms (auxiliary feedwater, essential cooling water, containment spray, high pressure safety injection, and low pressure safety injection pumps).
The ECWS at each Palo Verde unit consists of two trains, each capable of cooling all of the components associated with each respective train.
An exception to this is the control room which is redundantly served by both trains.
During normal operation, neither train is in operation.
Normal space cooling is provided by the nonsafety-related normal heating, ventilation, and cooling system (normal HVAC).
When the technical specifications were originally issued, the basis statement for Technical Specification 3.7.6 governing the requirements for the ECWS stated that the normal HVAC system is redundant to the
- ECWS, and that based on
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the availability of the normal HVAC and the reliability of the offsite power system from which it is powered, the allowable outage time for the ECNS was extended from the usual 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days.
On August 22, 1991, the licensee completed an engineering evaluation of the capability of the normal HVAC which showed that the cooling capacity was not adequate to provide redundant cooling to the components cooled by ECMS, as previously believed.
The calculations showed that the normal HVAC was adequate for the control room, the ESF switchgear rooms, the battery rooms, the remote shutdown
- rooms, the DC equipment
- rooms, and the electrical penetration rooms.
However, the normal HVAC was not adequate for the large heat loads produced by all of the ESF pumps should they be running.
Normal HVAC only provided adequate cooling for these pump rooms during normal operation when these pumps were not running.
Upon finding this problem, the licensee filed Licensee Event Report 91-7 on Unit I on September 23,
- 1991, and Revision I on March 15,
- 1992, and committed, in the interim, to administratively limit the allowable outage time for the ECMS to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The proposed amendment corrects an error that was made when the technical specifications were originally issued for each unit.
Since the normal HVAC is not fully redundant, it is not appropriate to give it credit by extending the allowable outage time beyond the normal 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The amendment request places the allowable outage time for the ECWS for a single train out of service at 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> which is the same as the allowable outage time for all the other safeguards equipment, such as: the emergency core cooling system, the essential cooling water system, the auxiliary feedwater
- system, and,the containment spray system.
The proposed change is therefore acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Arizona State official was notified of the proposed issuance of. the amendment.
The State official had no comments.
- 4. 0 ENVIRONMENTAL CONSIDERATION The amendments change a requirement with respect to the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes surveillance requirements.
The NRC staff has determined that the 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 the amendments involve no significant hazards considera-
- tion, and there has been no public comment on such finding (57 FR 37560).
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,t Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)'(9).
Pursuant to 10 CFR 51.22(b) no environmental'mpact statement or environmental assessment need 'be prepared in connection with the issuance of the amendments.
N.O
'~CNCLUN ON The Commission 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,
'(2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment 'will not be inimical to the common
- defense, and security or to the health and safety of the public.
Principal Contributor:
C., Trammell Date:
October 'i, 1992
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