ML20070V984
| ML20070V984 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 04/08/1991 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CP-89-023, CP-89-23, TXX-91135, NUDOCS 9104120250 | |
| Download: ML20070V984 (1) | |
Text
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Log # TXX 91135 i
4 File # 10.110 E
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nlELECTRIC April B._1991 Wilhem J. Cahal Jr.
I twuron Yko brudent U. S. Nuclear Regulatory Commission j
Attn: Document Control Desk Washington, D.C.
20555
SUBJECT:
C0HANCHE PEAK STEAM ELECTRIC STATION (CPSES) UNIT 2 DOCKET NO, 50 446 POTENTIAL LOSS OF RHR
$0 art CP 89 023 (SUPPLEMENTAL REPORT)
Gentlemen On September 25,'1989, TU Electric notified the NRC via letter logged TXX-89719 of a reportable deficiency involving the failure of a non safety _
related power supply which has the potential to adversely affect Residual Heat Removal (RHR) operability under certain conditions.
A commitment was made at that time to assess thit condition for Unit ~2 after the resumption of the balance of engineering activities.
Corrective Action i
The corrective action for Unit 2 will be identical to-that of Unit 1.
That is, the appropriate Unit 2 procedures for operation of the RHR system will require the use of other RHR valves (which are not affected by loss of control power or instrument air) to restrict RHR flow during operating modes 5 and 6 when the reactor coolant system is in a reduced inventory condition.
This will ensure that, if the flow control valves fail _ open, flow will not exceed established limits.
Administrative controls will ensure these valves are fully opened after restoration from reduced inventory RHR decay heat removal.
These actions will be completed prior _to fuel load, Sincerely,
[
i William J. Cahill. Jr.
1
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Mr. R. D. Martin, Region IV Resident inspectors. CPSES (3).
Mr. H. Fields,-NRR 9104120250 91040s 7g es y.
DR ADOCK~CSOO 6
400 North olive street LB. s t Dettas, Texas 75201 lf
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