ML20063A394

Special Rept 93-24:on 931218,penetrations 1602,1731,60A & 860 Intentionally Breached to Facilitate Installation of Design Mod.Fire Detectors on One Side of Penetrations Verified Operable & Roving Fire Watches Established

ML20063A394
Person / Time
Site:	Sequoyah
Issue date:	01/18/1994
From:	Fenech R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
93-24, NUDOCS 9401250307
Download: ML20063A394 (4)

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r, w n vpur x P Ant A Fenoch n;i er < ;< oyah r.m var nin, January 18, 1994 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket No. 50-327 Tennessee Valley Authority )

SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 1 - FACILITY OPERATING LICENSE DPR-77

- TECHNICAL SPECIFICATION (TS) 3.7.12 SPECIAL REPORT 93-24 The enclosed special report provides details concerning five fire barriers that were nonfunctional for a period of time greater than the TS allowable timeframe. This report is being submitted in accordance with TS 3.7.12 Action Statement (a).

If you have any questions concernin C. H. Whittemore at (615) 843-721D.g thic submittal, please telephone Sincerely, khf Robert A. Fenech

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U.S. Nuclear Regulatory Commission Page 2 January 18, 1994 cc (Enclosure):

Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville PJke Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 3

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e ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 1 SPECIAL REPORT 93 I. PENETRATION MARK NOS. 1603, 1731, 60A and 860 pgantiption of Condition On December 18,1993, at 0940 Eastern standard time (EST), with Unit 1 in Mode 5 coming out of a refueling outage (Unit.1 Cycle 6), l the following four penetrations that served as fire barriers were intentionally breached to facilitate the installation of a design modification. The penetrations have been nonfunctional as fire barriers in excess of the seven days allowed by Limiting Condition for Operation (LCO) 3.7.12 Action Statement (a).

1. Penetration Mark No. 1603 (in wall Al at the T line, Elevation 721.5)

2. Penetration Mark No. 1731 (in wall.A3 and between the S and T lines, Elevation 719.0)

3. Penetration Mark No. 60A (in wall Al at the Q line, Elevation 701.0)

4. Penetration Mark No. 860 (in the floor south of A2 and west.of the T line, Elevation 714.0)

The modification is for the installation of the secondary boric acid injection system. This system will tie into the existing secondary chemical feed system (hydrazine system No. 36).

Corrective Actinn 7 These conditions are being reported in accordance with Technical Specification Action Statement.3.7.12.a.

1 In accordance with LCO 3.7.12 Action Statement (a), the fire l detectors on one side of each of the penetrations were verified I operable and roving fire watches were established. The fire watches I will be maintained.until the breaches are removed and the fire l barriers.are restored to a functional status. I II. FIRE DOOR A-126 Description of_Cnndition On-December 9, 1993, at.0745 EST, with Unit 1 in Mode'5 coming'out-

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of a refueling outage.(Unit 1. Cycle'6), Fire Door A-126 was breached to permit the routing of the cables necessary for.the Unit containment integrated leak rate test instrumentation. The fire barrier was nonfunctional in excess of the seven days allowed by LCO 3.7.12 Action Statement (a).

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Corrective Action In accordance with LCO 3.7.12 Action Statement (a), the fire detectors on one side of the breach were verified operable; a roving fire watch was established. The fire watch was maintained until the breach was removed on December 20, 1993, at 1203 EST, and the fire door was reestablished as a functional fire barrier.

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