ML20093H887

Interim Deficiency Rept Re Reactor Coolant Pump Seals & Seal Covers.Initially Reported on 840622.No Activity Currently Being Pursued.No Further Repts Will Be Made Unless Facilities Reactivated

ML20093H887
Person / Time
Site:	Midland
Issue date:	07/20/1984
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
31793, 84-10-#1, OL, OM, NUDOCS 8410160420
Download: ML20093H887 (4)

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Consumers-Power James W Cook

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Gener6 offices: 1945 West Parnell Road, Jackson, MI 49201 e (517) 78&O453 July 20, 1984 84-10 #1 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III-799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 REACTOR COOLANT PUMP COVER AND SEAL FILE:

0.4.9.97 SERIAL:

31793 1

On June 22, 1984, Consumers Power Company notified your staff of a potential 10CFR50.55(e) condition involving reactor coolant pump senis and seal covers. This is an interim report.

Description of Concern During normal operation, reactor coolant pump seal injection water, which is supplied from the make-up tank, has a temperature of 95-125'F.

In cases such as HPI initiation, however, seal injection water is supplied from the borated water storage tank, which could have a temperature of 40*F during cold weather. 'the resulting temperature transient could damage the reactor coolant puep cover and seals causing a breech of the pressure boundary.

Background and Scope of Investigation This issue originally was documented by B&W as a Preliminary Safety Concern.

Since that time, engineering analysis has failed to eliininate all potential safety consequences of this condition.

In fact, investigation has confirmed that a seal injection water transient could take place under certain conditions and that under those conditions, seal injection water temperature would drop below the range specified for plant design.

Analysis of Safety Impact B&W has been requested to determine whether plant safety could have been adversely affected. B&W's evaluation is not complete. Engineering judgment has been consistent on both B&W and CPCo's part that the pump materials affected could in fact successfully withstand the few transients that would be inspected over the life of the plant.

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'2 Serial 31793 84-10 #1 Root Cause The. root cause of the condition was that the design which was a' slight modification of previous pump designs did not consider the design basis of cold ejection water affecting the seals and seal covers..

Corrective Action.

.The following. corrective actions will_be. required to resolve this issue:

1) Make a' final determination if plant safety is impacted.

2) If necessary as the result of Item.1, make plant modification to assure temperature transients are acceptable, No activity is currently being pursued on this subject. No fu'rther reports on this subject will be made unle'ss the Midland Energy Center is reactivated.

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JWC/AHB/lr CC: Document Control Desk, NRC Washington, DC NRC Resident Inspector's Office Midland Nuclear Plant DSHood, NRC Office of NRR Bethesda, MD INPO Records Center l

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3 Serial 31793 84-10 #1 OM/0L-SERVICE LIST

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-Mr Frank'J Kelley Atomic Safety'& Licensing

. Attorney General of'the Appeal Board State of Michigan U S Nuclear Regulatory Commission-Ms Carole Steinberg

= Washington, DC 20555 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 Office 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 EDr Frederick P Cowan 5795 North River Road 6152 N Verde Trail Rt 3 Apt B-125 Freeland, MI 48623 Boca 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 1

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4 Serial 31793 84-10 #1

'Mr D'F Judd-i Babcock & Wilcox PO Box 1260-Mr John Demeester, Esq

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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 S Beaumont Washington, DC 20009 1600 First Federal Bldg-Woodward Ave Detroit, MI 48226 3/14/84 OC0784-0029A-MP01

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