ML19326D520

Interim Deficiency Rept Re Small Break Analysis.Design Mod Requiring HPI Line Crossovers Downstream of Line Isolation Valves & Outside Reactor Bldg Planned.Next Rept Expected 780929

ML19326D520
Person / Time
Site:	Midland
Issue date:	07/18/1978
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
HOWE-124-78, NUDOCS 8006170966
Download: ML19326D520 (3)

Text

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Consumers Power s,.. .. . ....

u company

. General Offeces: 212 West Machegan As mue.Jacb. son. Michigan A9201. Area Code S17 788-05S0 July 18, 1978 Hove-124-78 Mr J. G. Keppler, Regional Director Office of Inspection & Enforcement '

Region III _

US Nuclear Regulatory Commission .  ;;

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799 Roosevelt Road -

Glen Ellyn, IL 60137 .L ,

HIDLAND NUCLEAR PLA5T - '

UNIT NO.1, DOCGI' No. 50-329 ?i. .

'~~ i;p 2 UNIT NO. 2, DOCK 2P NO. 50-330

• SMALL BREAK ANALYSIS

Reference:

1) 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; Smc11 Break Analysis, Howe-74-78, dated May 12, 1978 The referenced letter was an interim report as is this letter. CPCo and our A-E reviewed the long term solutions proposed by B&W for the small break LOCA analysis /HPIsignificantdeficiency. It is our present plan to use a design modification which requires HPI line crossovers downstream of the HPI line isolation valves and outside of the reactor building as well as the addition of five check valves for each unit. This particular solution has the advantage of not requiring any operator action.

Consumers vill pursue the above stated design modificat$on over the next several months to validete its adequacy and to assure that it is the most desirable solution. Typical detailed engineering to be completed includes sizing of lines, designing / selecting additional hangers and valves, relocating lines and valves, reanalyzing HELBA or generating a new EELBA analysis and preparing a revised or new stress analysis for the system.

A revised ECCS analysis is being conducted by B&W for incorporation in a revision to their Topical Report B&W lolo3, ECCS Analysis of B&W's 177 F.A.

Lovered Loop NSS, which will be referenced in the Midland FSAR.

Another interim or final 50 55(e) report vill be provided on or before September 29,1(Jf8.

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Infomation and Program Control, USNRC (1)

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j 6r)f94,/4V REGULATORY INFORMATION DISTRIBUTION SYSTEt1 (RIDS) .

DISTRIBUTION FOR INCOMING MATERIAL

({_50-32)/330 REC: KEPPLER J G ORG: HOWELL S H DOCDATE: 07/18/78 NRC CONSUMERS PWR DATE RCVD: 07/25/78 DOCTYPE. LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 0 FURNISHING ADDL INFO TO CONSTRUCTION DEFICIENCY REPT SMALL BREAK ANALYSIS.

HOWE-74-78, DTD MAY 12, 1978, CONSISTING OF INFO RE LONG TERM SOLUTIONS PROPOSED BY B&W FOR THE SMALL SREAK LOCA ANALYSIS /HPI SIGNIFICANT DEFICIENCY.

PLANT NAME. MIDLAND - UNIT 1 REVIEWER INITIAL: XJM MIDLAND - UNIT 2 DISTRIBUTER INITIAL: umA ocoo************* DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************

CONSTRUCTION DEFICIENCY REPORT (10CFR50.55E)

(DISTRIBUTION CODE D019)

FOR ACTION: ASST DIR VASSALLO**LTR ONLY(1) BR CHIEF LWRM4 BC**LTR ONLY(1)

PROJ . HOOD **LTR ONLY(1) LIC ASST LWR #4 LA**LTR ONLY(1)

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INTERNAL: EG F LTR ONLY(1) NRC PDR**LTR ONLY(1)

E**LTR ONLY(2) OELD**LTR ONLY(1)

GOSSICK & STAFF **LTR ONLY(1) MIPC**LTR ONLY(1)

DIRECTOR DPM**LTR ONLY(1) DEPUTY DIR DPM**LTR ONLY(1)

QAB**LTR ONLY(1) DIRECTOR DSS **LTR ONLY(1)

AD FOR ENG**LTR ONLY(1) AD FOR REAC SFTY**LTR ONLY(1)

AD FOR PLANT SYSTEMS **LTR ONLY( AD FOR SYS & PROJ**LTR ONLY(1)

SD**LTR ONLY(1) K SEYFRIT/IE**LTR ONLY(1)

FERD DREHER/IE**LTR ONLY(1)

EXTERNAL: LPDR'S -

MIDLAND, MI**LTR ONLY(1)

TERA **LTR ONLY(1)

NSIC**LTR ONLY(1)

ACRS CAT A**LTR ONLY(16)

DI STRIBUTION: LTR 41 ENCL O CONTROL NBR: ' efp7&&S7'

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SIZE: 2P /lfhf cocoo****************************** THE END *********************************C l

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