ML19347D417

LER 81-003/03L-0:on 810210,new Penetration in Fire Wall Between Engineered Safeguards Actuation Sys,Fire Area CB-3C & Relay Room,Fire Area CB-3D,found Necessary for New Cable Routing for Mods on Containment Isolation RM-5C

ML19347D417
Person / Time
Site:	Three Mile Island
Issue date:	03/12/1981
From:	Mitchell D METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347D411	List: ML19347D410 ML19347D417
References
L1L-067, L1L-67, LER-81-003-03L-01, LER-81-3-3L-1, NUDOCS 8103170573
Download: ML19347D417 (3)

Text

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Attachment 1 LlL 067 U.5. NUCLEAR REGULATORY ConnadissioN asAc FOmed 354 c7- m LICENSEE EVENT REPORT O Co~1 o< Scocc i . ,

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8 to el DOCKET Nynsegn a se EVENT DESCRIPTION AN. PMoSASM CONSEQUENCES h (

ITTTII A new penetration in the fire wall between the ESAS switcheear room (Fire Ares CB-3C) and the Relay Room (Fire Area CB-3D) was required for the routing of new l

,,,,,g cable to support restart mods.on Containmen't Isolation (RM-5C). Therefore, the l g o ,3, ,

health and safety of the public was not affected. The event is reportable per  !

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. NARRATIVE REPORT L1L 067

. TMI-l LEn 81-03 I. Current Activities at the Time of the Occurrence Reportability of this event was determined to be necessary in the planning stage of restart modification RM-SC, Containment Isolation Modifications. The event occurred when the fire wall was breached when core boring a new penetration for RM-SC.

II. Leading Circumstances to the Occurrence PORC review of RM-SC work package which included plans for pro-viding new penetration in wall.

III. Descriotion of the Occurrence A new penetration in the fire wall between the ESAS switchgear room (Fire area CB-3C) and the Relay Room (Fire area CB-3D) was required for the routing of new cable to support restart mod-ification RM-SC, Containment Isolation. The PORC was asked to review potential reportability of creating a new fire barrier penetration and determined that it was reportable as a violation of Techn cal Specification 3.18.7 and reportable under Technical Specification 6.9.2.B(2). The PORC discussion was mainly the wording of Technical Specification 3.18.7 which does not allow any operation with a non-functional fire barrier (with a posted fire watch) for any length of time without submitting a report. Standardized Tech Specs (NRC letter dated September 19, 1930) allow operation in a degraded mode while the TMI-1 Te:hnical Specifications require the fire barrier penetration saals to be functional at all times.

An approved temporary fire barrier seal has been provided for installation at the end of each work day prior to the securing of the posted fire watch. The fire watch is set when the temp-orary seal is removed at the beginning of work each day. En-largement of the penetration is expected to be completed by March 16, 1981, at which time a permanent fire barrie: pene-tration seal will be installed in accordance with GEE-GS-9 Rev. 1, Technical Specification for Fire Barrier Penetration Seals. Following the installation of the permanent seal, new cable and conduit to support KH-5C will be installed per M.P.

1420-FB-1. The initial PORC review was made on February 2, I981, and actual Tork started on February 10, 1981.

IV. Resultant Events None to Date V. Previous Events of a Similar Nature There have been previous events concerning failed fire barrier ,

penetration seals, however, none are similar since this was a planned breach of a fire wall (creation of a new penetration).

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• Narrctiva Report

'TMI-1 LER 81-03 Page 2 VI. Root Cause of the Occurrence Technical Specification 3.18.7 not allowing 14-day operation in a degraded mode with a posted fire watch (TSCR No. 97, 1/26/81).

3 VII. Immediate Corrective Action .

Technical Specification 3.18.7.2 was complied with by posting a fire watch with the opening of the new penetration. Compliance with Technical Specification 3.18.7.1 reestablished daily with the installation of a temporary, approved fire barrier seal.

VIII. Long Term Corrective Action The planning and actions taken to support RM-SC will be done for other new core bores in rated fire barriers. Technical Specification 3.18.7 should be changed to allow 14-day operation in a degraded moda with a posted (or roving, dependent on plant condition) fire wa:ch (TSCR No. 97, 1/26/81).

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