TXX-7124, Interim Deficiency Rept CP-87-85 Re Degradation of Class 1E Circuits.Initially Reported on 870903.Approved Isolation Devices or Appropriate Analysis Will Be Provided.Next Rept Will Be Submitted by 880217
| ML20237E658 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 12/23/1987 |
| From: | Counsil W, John Marshall TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| RTR-REGGD-01.075, RTR-REGGD-1.075 CP-87-85, TXX-7124, NUDOCS 8712290112 | |
| Download: ML20237E658 (2) | |
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-M Log # TXX-7124 h
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907 Ref. # 10CFR50.55(e)
M# ELECTRIC December 23, 1987 wmi m c. coumii Emutive Yke Preulent U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
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SUBJECT:
COMANC!iE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 DEGRADATION OF CLASS 1E CIRCUITS SDAR: CP-87-85 (INTERIM REPORT)
Gentlemen:
On September 3,1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving the Safety Systems Inoperable Indication (SSII) panel.
Our latest report was logged.TXX-7039, dated December '10,1987. We are reporting _this issue under the provisions of 10CFR50.55(e).
The required information follows.
Descriptio_n During investigation of third party inspection findings the non-Class 1E SSII panel was identified as being directly connected to Clas-s 1E circuits without isolation devices or an appropriate analysis.
In addition, the cables which make these connections were discovered to be routed with Class 1E cables but documentation is not available qualifying these cables to Class 1E standards.
These conditions are contrary to the requirements of Regulatory Guide 1.75 and IEEE 384 - 1974 for circuit isolation and IEEE 383 - 1974 for cable qualification.
The cause of this deficiency is the failure of the der an documents (involving the SSII panel) to conform to the criteria and basis stated in'the FSAR.
e The safety implications of this deficiency are limited to the SSII system.
Safety Implications Connection of the SSII panel to Class 1E circuits without. isolation devices or an appropriate analysis, could result in degradation of the Class IE circuits and failure of safety related equipment associated with these circuits.
Routing of non-Class 1E cables with Class 1E cables could result in degradation of the Class 1E cables-and the associated Class 1E circuits.
This issue represents a significant final design deficiency as approve'd and released for construction and, were it to have remained uncorrected, could-q have adversely affected the safety of plant operations.
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1 TXX-7124 1
December 23, 1987 Page 2 of 2 Corrective Action i
In order to comply with the regulatory requirements and IEEE standards, approved isolation devices or an appropriate analysis will be provided between the SSII panel and the affected Class 1E circuits.
In addition, the Non-Class lE cables will be adequately separated from the associated Class IE cables. A definitive schedule for the completion of these corrective actions will be l
provided in a supplemental report which will be submitted no later than February 17, 1988.
Very truly yours, w.c o a
W. G. Counsil i
By:
J. S. Marshall Supervisor, Generic Licensing VIP /grr c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3)
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