ML20091D637
| ML20091D637 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 04/06/1992 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CP-84-27, TXX-92065, NUDOCS 9204100317 | |
| Download: ML20091D637 (2) | |
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Log # TXX-92065
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Z Fi1e # 10110
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Ref. # 10CFR50.55(e)
TUELECTRiC Wl 6, M wimo 2. c,.htii, Jr.
Group Vice President U. S. Nuclear Regulatory Commission Attn: Document Control Desk t*ashington, DC 20555
SUBJECT:
COM/,NCHE PEAK STEAM ELECTRIC STATION - UNIT 2 DOCv(ET NO. 50-446 VENTIl.ATION EXHAUST DAMPERS SDAR CP-84-27 (SUPPLEMENTAL REPORT)
Gentlemen:
On March 6, 1935, TU Electric notified the NRC of via report logged TXX-4409 of a reportable deficiency involving the designed failure modes of certain Primary Plant Ventilation System (PPVS) exhaust dampers and several other related issues.
These exhaust dampers are designed to fail closed which could divert potential releases into rooms where operator action may be required.
Our last letter on this deficiency. TXX-89670 dated October 9, 1989, provides the corrective actions for these deficiencies and stated that differeaces in corrective action between Unit I and Unit 2 would be described in future correspondence.
The Unit 2 corrective actions for the first three of the four specific issues described in TXX-89670 will be the same in as described for Unit 1.
The fourth issue involves Class 1E limit switches and solenoid valves that were mounted on ce,'tain safety-related dampers.
Design verification proved that the dampers parformed no safety function an.1 were not required to cF.ange p;sition as a result of any accident.
Therefore, the dampers were downgraded to non-nuclear safety (NNS).
On Unit 1, the Class 1E electrical actuators and appurtenances were maintained ds Class 1E although the dampers were downgraded to NNS.
On Unit 2, the class 1E actuators and appurtenances installed o
""S dampers are being downgraded to non-Class 1E and the electrical isol
,1 N is being provided per the criteria in Section 8.3 of the CPSES Fina! Safety Analysis Report.
9204100317 920406 PDR ADOCK 05000445 S
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400 N. Olive Stnet LB. 81 DaHas, Texar 75201 Q0
ab TiX-92065 Page 2 of 2 All cort ective actions necessary for Unit 2 will be completed prior to Unit 2 fuel load, Documentation for these deficiencies will be available onsite for fiRC review after completion of Unit 2 corrective actions.
Sincerel
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William tl, Cah(ill, Jr.
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MCP/fds c-Mr. R.D.'
rtin, Region IV Resident Inspectors, CPSES (2)
Mr. B. E. Holian, NRR i
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