ML20042E070
| ML20042E070 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 04/10/1990 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-90135, NUDOCS 9004190288 | |
| Download: ML20042E070 (2) | |
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M lllllllL" M Log # TXX-90135 h
d File #-10110 1
907.3 TUELECTRIC.
April 10, 1990 Wmism J. Cahm, Jr.
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U..S Nuclear-Regulatory Commission
.. Document Control Desk d
1 Attn:
Washington, D, C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC' STATION (CPSES)
DOCKET NOS 50-445-AND.50-446, ASCO' SOLEN 0!DS FOR MAIN STEAM ISOLATION. VALVES-Gentlemen:
4 A meeting was held on March 5,1990,- at the NRC White Flint office among'
.f representatives of the NRC,and TV-Electric to discuss offsite power -
J availability for the: Automatic Switch-Company:(ASCO) solenoid. operated.. valve:
.(S0V)-for each Main Steam Isolation 4 Valve (MSIV) in'the' event of the non-T mechanistic Main Steam line crack' in the superpipe region. The latest report l.
related'to this issue, logged TXX-90013, was submitted February 7, 1989.'
The ASCO SOV is located in the air supply to,the hydraulic-pump for-the MSIV actuator and is energized to close:to prevent the: continued pumping off hydrculic fluid to the MSIV's actuator..TU Electric clarifiedlit's position, consistent with FSAR' 0&R 10.20'and 140'1 - that each ASCO S0Y is energized from Non-1E available offsite power during this event.
Further,'should'offsite power not be available, the ASCO SOV's can be energized to close from Non-1E-l.
batteries.
In' response to this position, the NRC. requested that TU' Electric-L provide additional assurances that if-offsite powerfwere to become L:
unavailable, provisions are made to restore power torthe appropriate battery
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charger for the. subject ASCO S0V's earlysin the recovery, process.
The NRC-requested a submittal with a commitment to.-incorporate the necessary guidance L
into 'the appropriate Emergency. 0perating Procedure'.(EOP). The NRC also L
requested that the-submittal contain information concerning the required steps to restore power to the subject battery charger, if.offsitel power were to l
become unavailable.
l-The attachment provides the information required to' address the NRC questions.
Sincerely, i
/
i William J. Cahill,yJr..
HAM /vid
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Attachment.
c - Mr.
R.,D.
Martin, Region IV
'O Resident Inspectors, CPSES (3)
-9 OA190288 9004'10-O
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4 Attachment to TXX-90135 Page 1 of 1 Restoration of Power to the ASCO SOV Battery Charcer Guidance willHbe provided;in the appropriate E0P to assure restoration of power to the appropriate:Non 1E battery' charger, fer the batteries which power the ASCO'SOV's, early in the recovery process, if required.
Restorati on' of' power will provide additional. assurances that, if-offsite power is lost.1 and-the Main Steam"line break is inside the Main Steam pipe penetration areas-outside containment, the HSIV's,will remain closed.f_The operator _will be instructed-to restore power to-the batteries that supply power-to the ASCO l
- S0V's.
The required: change to' the subject Unit l' E0P is scheduled to'be' completed by April.16, 1990, Incorporation of'the above-guidance into the Unit 2 E0P will be determined when Unit 2 activities resume, 1
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