ML19270G402

Summarizes 790518 Telcon W/Cm Trammell,In Response to IE Bulletin 79-01,Item 4.Location of Valve Mo 10010 Is Below post-LOCA Containment Water Level.Design Activities Initiated to Relocate Valve

ML19270G402
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	06/01/1979
From:	Goodwin C PORTLAND GENERAL ELECTRIC CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
TAC-11299, NUDOCS 7906060281
Download: ML19270G402 (2)

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June 1, 1979 Trojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation ATTN:

Mr. A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Sir:

In accordance with IE Bulletin 79-01, Item 4, and the telephone call of Mr. Erickson with C. M. Trammell of your staff on May 18, 1979, we are providing the follow up written report concerning the location of Valve MO 10010 below the post-LOCA Containment water level. Valve MO 10010 is the in-Containment isolation valve of the Train B hydrogen vent system (CS-9, FSAR Figure 6.2-48) which if required would be operated during the eighth-day post-LOCA (see FSAR Section 6.2.5.3.3).

The hydrogen vent system as described in FSAR Section 6.2.5 provides a baqkup means to control hydrogen if both fully redundant hydrogen recombiners failed to operate. This valve, if open, at the time of a LOCA initiation would close on a Containment isolation signal prior to being submerged.

Technical Specification 3.6.4.3, Limiting Condition for Operation, requires only one operable hydrogen vent system and its Action Statement with no hydrogen vent system operable requires restoration of at least one system to operable status within 30 days. The Plant is currently shutdown, in operational Mode 5, and not expected to be started up before 2274 357 790cesaag 7

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Pert!at General Eecide Ccnwny Mr. A. Schwencer June 1, 1979 Page two July 1, 1979. Design activities have been initiated to relocate Valve MO 10010 above the post-LOCA Containment water level prior to startup on July 1.

Sincerely,

,/l

/s C. Goodwin, Jr.

Assistant Vice President Thermal Plant Operation and Maintenance CG/CAZ/4gahlA16 c:

R. H. Engelken, Director NRC Region V Lynn Frank, Director State of Oregon Department of Energy 2274 458

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