ML18046A856
| ML18046A856 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 08/10/1981 |
| From: | Vincent R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-09-03, TASK-9-3, TASK-RR NUDOCS 8108130052 | |
| Download: ML18046A856 (3) | |
Text
consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Ml 49201 * (617) 788-0660 August 10, 1981 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 U S Nuclear Regulatory.Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR~20 -
PALISADES PLANT - SEP TOPIC IX-3, STATION SERVICE AND COOLING WATER SYSTEMS NRC letter, dated Ma;Y 26, 1981 transmitted for comment a draft evaluation of SEP Topic IX-3 for the Palisades Plant.
Consumers Power Company comments on this evaluation were provided to the NRC in our letter of July 7, 1981.
Upon further evaluation, we have determined that one of our comments was in error and that a second should be further amplified.
This letter, therefore, provides our corrected comments for this topic.
For convenience,*all of our comments on the NRC evaluation of Topic IX-3 are included herein.
Our previous letter of July 7, 1981 should therefore be considered to be superseded.
COMMENTS
- 1.
Page 6 - Table 1 is not included in report.
- 2.
Page 6 - Prior to recirculation, CCW is not used to remove energy from the containment and the significant SWS load is wat6r for the 3 air coolers.
The energy removed by 3 air coolers is 229 x 10 Btu/hr.
However, a~er recirculation, energy is removed via both the SWS (CCW HX and air coolers) and CCW (containment sprays).
FSAR Sec 14.18 found the heat removed by 2 containment spray pumps to be sufficient.
Under this configuration, the heat removed is 167 x 106 Btu/hr.
Thus, this value should be used as the heat load rather than 229E6 Btu/hr.
- 3.
Page 6 - With only D/G 1-1 operable, the required service water flow is 8855 gpm:
SEP Topic IX Comments Page Two 1 air cooler 2 CCW HX Eng. Safegliards A/C Control Room A/C D/G Cooling Air Compressors 1625 gpm 6600 gpm 200 25 400..
5 8855 gpm However, there is only one service water pump loaded on.D/G 1-1 with a flow of 8000 gpm.
Because of this 855 gpm debt in service water flow the outlet temperature of:
the CCW heat exchanger (CCWHX).will increase.
This raises a concern that the CCW water temperature will exceed the design.rating.
The FSAR lists a CCW design temperature rating of 1*4o°F.
There seems to be no basis for this from the standpoint of material or equipment temperature limits.
In fact, the CCWHX was designed to operate with an inlet temperature of 156°F and an outlet temperature of 114°F to meet the design heat removal rate.
Likewise, the SDC heat exchanger is designed to operate with an inlet temperature of 114°F and an outlet temperature of 156°F to meet_ its design requirements.
The piping, valves and fittings for the CCW loop are rated for well above 140°F.
The limiting components arethe shell side (CCW side) of the SDC heat exchanger and the CCW heat exchanger which have design tem-peratures of 200°F.
Thus, the limiting temperature for.the CCW system is actually 200°F, not 140°F.
Analysis shows that with an 855 gpm reduction in SW flow the CCW maximum loop temperature will increase from 156°F to 162°F.
This is well below the limit-ing component temperature of 200°F, and thus there is no need for additional operator action.
It is important to also note that the above assumes that all of the contain-ment heat load is removed by the CCW/SDC heat exchangers.
While they are designed to do this, in actuality there will be one air ~ooler operating with a DG 1-2 failure.
One air cooler could remove 76.6 x lOb Btu/hr from the con-ta:i,nment atmosphere under these conditions, thus greatly reducing the CCW/SDC heat exchanger loads.
The result will be even lower CCW temperatures than discussed above.
- 4.
Page 13 - The basis for 153 x io6 Btu/hr CS hea~ load cannot be identified in FSAR Section 14.18.
- 5.
Page 13 - With a DG 1-2 failure, the service water flow rate is discussed in comment 3 above.
The limiting component in the service water system is the CCW heat exchanger which has a 200°F design temperature. In addition, our calculations show that the service water temperature under the assumed con-ditions would approximate 133°F rather than 170°F.
- 6.
Page 16, First Paragraph - One service water pump is loaded on D/G 1-1; two pumps are loaded on D/G 1-2:
SEP Topix IX Comments Page Three
- 7.
Page 18., Last Paragraph - As described above, with a D/G 1-2 failure, there.
exists sufficient service water for containment energy removal without exceeding CCW design temperature.
Thus, there is no need for additional operator action.
Robert A Vincent Staff Licensing Engineer CC Director, Region III, USNRC NRC Resident Inspector-Palisades