ML18030A266

Part 21 Rept Re Lack of Special Conduit Separation in GE Floor Sections in Power Generation Control Complex at Facilities.Util & Ae Have Been Advised to Review Adequacy of Electrical Separation

ML18030A266
Person / Time
Site:	Susquehanna
Issue date:	04/24/1981
From:	Sherwood G GENERAL ELECTRIC CO.
To:	Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-81-403-000 MFN-065-81, MFN-65-81, PT21-81-403, PT21-81-403-000, TRR-26-81, NUDOCS 8104280036
Download: ML18030A266 (6)

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.py gyes-ooo NUCLEAR POVf ER SYSTEMS DlVlSION GENERAL ELECTRIC COMPANY, 175 CURTNER AVE., SAN JOSE, CALIFORNIA 95125 TRR-26-81 MFN-065-81 MC 682, (408) 925-5040 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Washington, DC 20555 Attention: Mr. Victor Stello, Jr., Director Gentlemen:

SUBJECT:

REPORTABLE CONDITION ELECTRICAL SEPARATION FOR PGCC (HPCI AND RCIC ISOLATION VALVES)

This is to advise the NRC of a reportable defect per 10CFR, Part 21 as reported to Mr. William R. Mills of your office by Malter H. D'Ardenne, Manager, Safety Evaluation Programs on April 7, 1981. This defect is in the PGCC floor section for Susquehanna 1&2 project. The defect was judged reportable on April 7, 1981. Attached is the report of the devi ation.

The uti.lity was informed by GE, and they have corrected the problem.

Very truly yours, G. G. Sh rwood, ana Safety and Licensing Operation GGS:hjr/31 Attachment cc: Mr. B. H. Grier, NRC, Region I Mr. U. Potapovs, NRC, Region IV Mr. J. F. McAllister, General Electric 8164280 036

S ecial Electrical Se aration For PGCC

1. The "Electric Equipment Separation for Safeguards System" specifi-cation applied to Susquehanna 1 and 2 requires special separation for the HPCI and RCIC inboard steam line isolation valves; This requires separation from Division I in conduit per the electrical separation document. The separation is special because the intent is to provide conduit separation of the "Div. I-X". circuit from other Division I circuits and conduit separation of the "Oiv. II-X" circuits from other Division II circuits. However, it is permissible on this plant to run the "Div. I-X" conduit in the same tray with Division I wires and "Div. II-X" conduit in the same tray with Division II wires. The intent of this requirement was to prevent a postulated single electrical failure that could disable both the HPCI system (and/or the RCIC system) and ADS. Most of this special conduit separation is supplied by the utility in the Balance of Plant portion of the electrical tray design. However, this re-quirement also applies to the Power Generation Control Complex (PGCC) floor sections supplied by the General Electric Company.

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2. The special conduit separation was missing from PGCC equipment designed and supplied by the General Electric Company.

3. The nature

'I of the defect was the lack of special conduit separation in the PGCC floor sections for electrical wiring to HPCI valve r

E41-F002 and RCIC Valve E51-F007. Lack of this conduit could allow a postulated single electrical failure to disable both the HPCI (and/or RCIC) and the ADS.

4. The lack of conduit separation in the Susquehanna PGCC floor sec-tions was confirmed orally by the GE-site personnel during the latter part of July 1980.

5. GE-site personnel have written FDDR's to enclose E41-F002 wiring from panel H12P617 to the PGCC termination cabinet and E51-F007 wiring from panel H12P618 to the termination cabinet in flexible conduit.

6. A letter has been sent to the customer and AE advising them to review the adequacy of the special conduit separation in their scope of responsibility.

GGS:hjr/29-30 12/1/80

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