ML19270F725

Deficiency Rept,Supplementing 790105 Deficiency Rept,Re Pressurizer Heater Sys.Decision Made Not to Pursue Complete Engineering Evaluation Defining Plant Response to Pressurizer Heater Unavailability During Plant Hot Shutdown

ML19270F725
Person / Time
Site:	Midland
Issue date:	03/16/1979
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
HOWE-91-79, NUDOCS 7903210034
Download: ML19270F725 (2)

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y Stephen H. Howell Senior t' ice Evesident s

General Of fices: 1945 West Parnall Road, Jackson, Michigan 49201 . (517) 788 0453 March 16, 1979 Hove-91-79 Mr J G Keppler, Regional Director Office of Inspection and Enforcement Region III US nuclear Regulatory Commission 799 Roosevelt Rocd Glen Ellyn, IL 60137 MIDLAHD RUCLEAR PIMf UHIT N01, DOCl272 UO 50-329 UNIT E0 2, DOCKET NO 50-330 PRESSURIZER HElsTER SYSTDI

Reference:

Letter, S H Howell to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket no 50-329; Unit no 2, Docket no 50-330; Pressurizer Heater System, Howe h-79; dated January 5,1979 The referenced letter vas an interim 50 55(e) report as is this letter.

. A decision has been made not to pursue further a complete engineering evaluation to define the plant response to pressurizer heater unavaila-bility during plant hot shutdown. This evaluation was option 1 from the referenced letter. The condition of pressurizer heater unavailability will be precluded by upgrading to Class lE the pressurizer control and power supply for heater banks 5 and 6 in each pressurizer and by demon-strating the operability of heater banks 5 and 6 following a Safe Shutdown Earthquake (SSE) .

FSAR (Revision 18) Sections 71, 7.4 and 7 5 provide the design bases for the Class lE upgrade described above. Sections 1 7, 3 0, 5 0 and 8 3 uill require further revisions to reflect actual design. It is

. anticipated detailed design vill result in en equipment purchase technical specification by May 1, 1979 IEW han proposed a qualification program by which to demonstrate the ability of the existing heater rods to withstand an SSE. Applicable environmentrl requirements u111 be addressed. The program definition, including any applicable IEEE standards requirements, is intended to be completed by June 1,1979 7903210D14 efs\' t 6

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2 Howe-91-79 Another interim 50 55(e) report will be provided on or before June 8, 1979

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,%u CC: Director of Office of Inspection & Enforcement Att: Mr John G Davic, Acting Director, USIIRC (15) c- Director, Office of Management Information & Program Control, U3IIRC (1)