ML20236J308
| ML20236J308 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/01/1998 |
| From: | Terry C, Walker R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20236J311 | List: |
| References | |
| TXX-98159, NUDOCS 9807080130 | |
| Download: ML20236J308 (3) | |
Text
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"""l Log # TXX-98159 File # 916 (3/4.7)
C C
10010 7UELECTRIC Ref. # 100FR50.90 100FR50.36 C. Lara Thrry sen% vic,presues, July 1,1998
&1 incipalNuclearOficer U. S. Nuclear Regulatory Commission Attn: Document Control nesk Washington, DC 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50 445 AND 50 446 ADDITIONAL INFORMATION FOR LICENSE AMENDHENT 96 004 UNINTERRUPTIBLE POWER SUPPLIES (UPS) HVAC SYSTEM ADDITION OF FAN COIL UNITS TO TECHNICAL SPECIFICATIONS
(
REF:
1)
TV Electric letter logged TXX-96405, dated July 10,1996, from C. L. Terry to the NRC.
2)
TU Electric letter logged TXX-96475, dated October 1, 1996, from C. L. Terry to the NRC.
Gentlemen:
In reference 1. TU Electric submitted License Amendment Request (LAR) 96 004 to amend the CPSES Unit 1 Operating License (NPF-87) and CPSES Unit 2 Operating License (NPF 89) to incorporate the changes associated with addition of train oriented Uninterruptible Power Supply (UPS) Fan Coil Units.
These Fan Coil Units are redundant to the existing Air i
Conditioning Units in the UPS HVAC System.
Reference 2 provides further i
l clarifications to assess the UPS HVAC System's ability to cope with a station blackout.
Based on the telecon held on June 25, 1998, the following additional information is provided for the UPS HVAC System Technical Specifications:
1)
NRC Reauest:
Provide justification for relocation of specific actuating signals (Safety Injection and Blackout) from Surveillance Requirement (SR) 4.7.11.1 to
., o BASES Section 3/4 7.11.
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PDR COM ANCllE PLAK ST EAM 111 I CT RIC ST AllON P.O. Box 1002 Glen Rose Texas 76043-i002
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, Page 2 of 3 1
CPSES Resoonse:
The relocation of " Safety Injection Test Signal" and " Blackout Test Signal" and addition of " Actual or Simulated actuation signal" are consistent with NUREG-1431. Revision 1.
The actual testing of the Safety Injection and Blackout Test Signals are not being altered by this change, but rather the format is altered for consistency with NUREG 1431. All actuating circuitry is and will continue to be tested.
Currently this testing is performed in conjunction with the integrated diesel generator and safeguards testing per Technical Specification SR 4.8.1.1.2f.
In several specifications throughout the Technical Specifications, operability of certain equipment is demonstrated by ensuring that the equipment performs its safety function upon receipt of a simulated test signal.
The intent of a ' simulated
- signal was to be able to perform the required testing without the occurrence (or without causing) an actual signal generating event.
However, the unintended effect was to require the performance of the surveillance (using a test signal) even if an actual signal had previously verified the operation of the equipment.
This change allows credit to be taken for actual events when the required equipment actuates successfully.
While the occurrence of events that cause actuation of accident mitigation equipment is undesirable, the actuation of mitigation equipment on an actual signal is a better demonstration of its operability than an actuation using a test signal. Thus the change does not reduce the reliability of the equipment tested.
The change also improves plant safety by reducing: 1) the amount of time the equipment is taken out of service for testing and thereby increasing its availability during an actual event; and 2) the wear of the equipment caused by unnecessary testing.
2)
NRC Reauest:
Confirm the environemntal qualification temperature for the UPS inverters.
CPSES Response:
CPSES inverter specification CPES E 1063 defines service condition as follows:
-Normal temperature range: 40 deg. F 104 deg. F
-Abnormal maximum temperature: 122 deg. F for 100 days.
In addition, the equipment shall be designed for temperature transient of 131 deg. F for 8' hours.
. Page 3 of 3 The inverter vendor has certified that the inverters are designed for the above service conditions.
This is consistent with the upper room temperature of 122 deg. F of the current station blackout analysis that was revised for the upgraded inverters which have been installed in both units.
3).
Correction on BASES 3/4 7.11 (Paae B 3/4 7-8):
The attachment provides editorial corrections for terminology of the Safety Injection Signal and Bleckout Signal in the last paragraph.
Should you have any questions, please contact Mr. Manu C. Patel at (254) 897 0139.
Sincerely.
C.3 %
C. L. Terry By:
M
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Roger'D. Walker Regulatory Affairs Manager MCP/mcp Attachment c-Mr. E. W. Merschoff, Region IV Mr. J. I. Tapia, Region IV Mr. T. J. Polich, NRR Resident Inspectors, CPSES Mr. Arthur C. Tate Bureau of Radiation Control Texas Department of Public Health 1100 West 49th Street Austin, Texas 78704 l
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