ML20093H475

Interim Deficiency Rept Re Core Flood Line Piping Supports in Reactor Pressure Vessel Connection Supplied by Bechtel. Overstressing Could Occur in Pipe Supports.No Commitment Made for Further Repts

ML20093H475
Person / Time
Site:	Midland
Issue date:	07/17/1984
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
31792, 84-09-#1, 84-9-#1, OL, OM, NUDOCS 8410160282
Download: ML20093H475 (4)

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& l Vice President - Projects, Engineering and Construction General offices: 1945 West Parnett Road, Jackson, MI 49201 o (517) 788 0453 July 17, 1984 84-0.9 #1, Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission

, Region III l 799 Roosevelt Road Glen Ellyn, IL 60137

! MIDLAND ENERGY CENTER PROJECT DOCKET WOS 50-329 AND 50-330 CORE FLOOD LINE FAILURE FILE: 0.4.9.96 SERIAL: 31792 It was determined that B&W had a modeling error in the reactor pressure vessel (RPV) connection to the RPV pedestal / primary shield wall, resulting in greater stiffness and underrrediction of RPV motions as a consequence of two (2) LOCA breaks.

B&W determined that there is no safety consequence or overstressing of NSSS components. However, the core flood line piping supports (Bechtel supplied) could be overstressed. A Bechtel Safety Concern Evaluation Report was initiated on May 18, 1984, to address this situation. After a brief initial review, Bechtel determined that overstressing could occur in the pipe supports.

-In line with our policy to report safety concerns if after 10 working days we do-not have complete confidence that the safety evaluation will result in determining that no safety concern exists, Consumers declared this item potentially reportable and informed the NRC, by telephone, on June 6,1984.

Bechtel has completed a review of the supports for Unit 2 and concluded no safety problem exists, but Unit I had not been analyzed. Even though Consumers also expects Unit 1 to not be a safety concern, there are sufficient differences between the units such that this can be definitely stated.

During a July 5, 1984 telecon with the NRC, Consumers retracted the potentially reportable condition on Un L 2 and requested a two week extension, to July 20, 1984, to retract the condition on Unit 1 or provide a written 30 day' report.

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Consumers has decided to declare this item potentially reportable for Unit

1. Due to the status of construction of Unit 1, Consumers will not pursue I this issue until such time that a decision for continuance of Unit I construction is made.

No commitment is made in this letter for further reports. Final disposition of this subject and other open 50.55(e) items needs to be addressed as a separate issue.

JWC/PWJ/lr CC: Document Control Desk, NRC DSHood, US NRC Washington, DC Office of NRR Midland NRC Resident Office INPO Records Center Midland Nuclear Plant I

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' Serial 31792 84 #1

'OM/0L SERVICE LIST Mr' Frank J Kelley .

' Atomic. Safety & Licensing-Attorney General of the . Appeal Board- l State of-Michigan U.S Nuclear-Regulatory Commission Ms_Carole Steinberg _

Washington, DC-20555 l Assistant-Attorney General '

Environmental-Protection Division Mr C R Stephens (3) 720 Law Building _ Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Cffice of the-Secretary-Washington, DC 20555 '

Mr Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago. IL 60602 Midland, MI 48640-Mr Wendell H Marshall Mr William D Paton, Esq RFD 10- Counsel for the NRC. Staff Midland, MI 48640 U S Nuclear Regulatory Commission' Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic-Safety & Licensing Atomic Safety & Licensing.

Board Panel _

Board Panel U S Nuclear Regulatory Commission U.S Nuclear Regulatory Commission East-West Towers, Room E-413 Washington, DC 20555 Bethesda, MD 20014 Ms Barbara Stamaris Dr Frederick P Cowan. 5795 North River Road 6152 N Verde Trail Rt 3-Apt B-125 Freeland, MI 48623 Eoca Raton, FL 33433 Dr Jerry Harbour Mr Fred C Williams Atomic Safety & Licensing Isham. Lincoln & Beale Board Panel 1120 Connecticut Ave, NW, Suite 840 U S Nuclear Regulatory Commission Washington, DC 20036 East-West Towers, Room E-454 Bethesda, MD 20014 Mr ' James E Brunner, Esq Consumers Power Company Mr M I Miller, Esq 212 West Michigan Avenue Isham, Lincoln & Beale Jackson, MI 49201 Three First National Plaza 52nd Floor Chicago, IL 60602 r

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[ Mr D F-Judd i Babcock & Wilcox

'POLBox 1260 Mr' John Demeester, Esq

-Lynchburg,.VA 24505 Dow Chemical Building Michigan Division Mr Steve Gadler, Esq Midland MI 48640 2120 Carter Avenue St Paul, MN 55108 Ms Lynne Bernabei Government Accountability Project Mr P Robert Brown 1901 Q Street, NW Clark, Klein & Beaumont Washington, DC 20009 1600 First Federal Bldg Woodward Ave Detroit, MI 48226 3/14/84 OC0784-0027A-MP01

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