ML19329E686

Interim Deficiency Rept Re Overstressed Reactor Bldg Spray Piping Supports.Piping Water Hammer Analysis Completed & Anchor Design Analysis Results Scheduled for 781006 Rept

ML19329E686
Person / Time
Site:	Midland
Issue date:	08/30/1978
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML19329E685	List: ML19329E686
References
HOWE-154-78, NUDOCS 8006170490
Download: ML19329E686 (6)

Text

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Consumers POWET Stephen H. Howell gmpgr J Vste Preudent General Off bces: 1945 West Parnali Road, Jackson, M6cNgen 49201

• Area Code 317 JV C453 Au6ust 30, 1978 Hove-154-78 Mr J G Keppler, Regional Director Office of Inspection and Enforcement US Nuclear Regulatory Co= mission

Region III j 799 Roosevelt Road 1 Glen Ellyn, IL 60137

( MIDLAND NUCLEAR PLANT UNIT NO 1, DOCKER NO 50-329

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UNIT NO 2, DOCKEI NO 50-330 REACIOR BUILDING SPRAY PIPING SUPPORPS 5

Reference:

1) Letter, S H Hovell to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket No 50-329; Unit No 2, Docket No 50-330; Reactor Building Spray Pipin6 Supports; Hove-60-78; dated April 'C, 1978

2) 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; Reactor Building Spray Piping Supports; Hove-92-78; dated June 13, 1978 The referenced letters and this letter are interim reports. Attachments 1 through 3 provide Bechtel Associates Professional Corporation Interim

( ' Reports k through 6 to MCAR-1 Report No 22. The attachments provide the status of the analysia being conducted to resolve the question of the adequacy of the reactor building spray piping supports relative to the ASME Section III Code allovable stress requirements.

Another report, either interim or final, vill be sent on or before October 20, 1978.

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6w Attachments: (1) MCAR-22, Interim Report f4, dated July 6, 1978 (2) MCAR-22, Interim Report f5, dated August 10, 1978 (3) MCAR-22, Interim Report #6, dated August 29, 1978 CC: Mr John G Davis, USNRC (1) Director of Office of Management L, Information & Program Control, USNRC (1)

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'Attachmant 1

/ Hove-151-78 4

Bechtel Associates ProfessionalCorporation

SUBJECT:

HCAR #22 (Issued 3/21/78)

INTERiti REPORT'#4 ,

DATE: July 6, 1978 PROJECT: Consumers Power Company ' -

Midland Plant Units 1 & 2'

.Bechtel Job 7220

• Status of Corrective Action and Investigation ,

The status of actions in progress for resolution of the subject MCAR is updated as follows:

1) Preliminary individual anchor load sheets including thermal, weight,

- and seismic response data were provided to ITT-Grinnell on June 22,

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. 1978. .

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ITI-Grinnellisanalyzingtheanchordesignwitht5esedatato evaluate whether allowable stresses are exceeded. Preliminary ,

results indicate that allowable stresses are not exceeded in 6-inch i anchors. Preliminary analysis of 3- and 4-inch anchors is ocheduled

• to be completed by July 14, 1978.

While performing this analysis. ITI-Crinnell is rechecking their previous analysis to ensure that ef forts were technically correct

- (see Corrective Action Item 1 of Interim Report #1).

2) . Unforeseen complexity in the calculation of piping water hammer loads has been encountered. In particular, the following reasons '

are cited: .

a) The effects of system piping friction losses have been determined

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to be significant and therefore had to be incorporated into the sy' stem computer model, in addition to the ef fects of air

. and vapor compression.. .

b) Asymmetry of the spray headers has introduced additional modeling complexity.

For these reasons, hammer forcing functions will not be available' until July 17, 1978, with formal results to follow in late

, t July.' -

3) Procedural methods for anchor design review and approval continue to be monitored. ,

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. Bechtel', ssociates Professional Corporation NCAR #22 INTERIM REPORT 4 Page 2 -

July 6, 1978 Forecast Data for Investigation and Corrective Action The following specific forecast dates are provided:

. 1) ITT-Grinnell evaluation of anchor loading which includes seismic forces will be completed by August 1, 1978. -

2) Bechtel hydraulic water hammer evaluation will be completed by August 1, 1978. Anchor loading design criteria do not require that seismic and water hammer loads be additive. Therefore.

if anchor loading which includes water i.ammer loads exceeds loading which include seismic , loads, reanalysis by ITT-Grinnell will be required. Such efforts, if required, would not be completed until September 15, 1978.

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Inasmuch as the next corrective action and investigative milestone is se,heduled for late July, the next report will be provided by August 7,1978.

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Submitted by 4 Approved b 'foldde N f

Concurrence by / pe.evf., W

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---g Bechte' .s'sociates Professiona' lorporation 1

SUBJECT:

MbAR #22 (Issu< cl 3/71/78)_

INTERIM RERORT #5, DATE: August 10, 1978 PROJECT: Consumers Power Company -

Midland Plant Units 1 & 2 Bechtel Job 7220 .

Status of Corrective Action and Investigation The status of actions in progress for resolution of the subject MCAR is updated as follows:

1) Finalized results of ITT Grinnell anchor design analyses for thermal, weight, and seismic response data are not available at this time.

t However, preliminary results indicate that allowable stresses will

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j not be exceeded in 3 , 4 , or 6-inch anchors for these loads.

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Finalized results are scheduled to be available at the time the next interim report is submitted.

2) The results of piping water hammer analyses indicate that loads including water hammer may exceed those including scismic. Therefore, additional ITT Grinnell reanalysis will be required.

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• Investigation of procedural methods for an'chor design review and indicated that existing procedures are adequate. These aplroval i

procedure.s continue to be monitored to ensure timely response and

. S resolution.

SubmitNdby L - # J h k..;2/V-< rN Approved bps.

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': Bechte' Associates Profession:' Corporation 6

SUBJECT:

MCAR #22 (Issued 3/21/78) ,

l Interim Report #6, DATE: August 29, 1978 .

PROJECT: Consumers Power Company

. Midland. Plant Units 1 & 2 j ' Bechtel Job - 7220 i

Status of Corrective Action and Investigation g

The status of actions in progress for resolution of the subject MCAR is updated as follous: _ ,.

1) No change in status on anchor design analysis for ' thermal, weight, and seismic response is reported at this time. When Interim Report

' #5 was written, the next interim report was scheduled for October

. 6,'1978..

. 2) "The results of piping water ha=mer analysis have indicated that loads including water hammer significantly exceed those developed including seismic. The revised program for analysis is as follows:

a. Time-history data for water hammer will be developed by Bechtel.

~b. ITT-Grinnell will perform an analysis to determine the adequacy

. of anchor design for the loads developed as a result of Item 2.a.

These efforts will include an analysis in accordance with Appendix F of Section III of the ASME Boiler and Pressure Vessel Code.

Forecast Data for Investigation and Corrective Action .

The following specific forecast dates are provided.

1) Finalized results of ITT-Grinnell anchor design analysis for thermal, weight, and seismic response data will be submitt'ed in the next interim report, scheduled for October 6, 1978., *

2) Item 2.a above is scheduled to be completed by October 1, 1978.

3) Item 2.b above is targeted to be completed by January 19, 1979.,

Firm schedules will be available by the next interim report.after a technical meeting with ITT-Crinnell.

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Bechte' %ssociates Professione' Corporation  !

MCAR # 22 INTERIll PIPuRT 6, August 29, 1978

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4) Providing that the schedule is maintained on all remainin5 ciforts,  ;

a final rep:rt can be submitted on February 16, 1979. ,

Submitted b'y ,//-

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