ML20038B707
| ML20038B707 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/04/1981 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 14268, 79-03-#6, 79-3-#6, 79-3-6, NUDOCS 8112090038 | |
| Download: ML20038B707 (2) | |
Text
r de O Consumers power James W Cook Vice President - Projects, Engineering and Construction 9-03 #6 General offices: 1945 West Ferne?1 Road, Jackson, V8 49201 + (617) 788-0453 December h, 1981 t'r J G Keppler, Regional Director Office of Inspection & Enforcement US Nuclear Regulatory Commission Regicn III 799 Roosevelt Road Glen Ellyn, IL 60137 ffL[
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MIDLAND FROJECT -
I k ogCp DOCKET NOS 50-329, 50-330 SMALL EREAK/ REACTOR COOLANT FUMP OPERATION INTERACTION lj J
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FILE:
0.h.9.28 SERIAL:
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References:
CPCo letters to J G Keppler; Sare Subject; os s
- 1) Serial Hove-221-79; dated August 15, 1979
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- 2) Serial Howe-271-79; dated October 19,1979 M~dM '
- 3) Serial Hove-25-80; dated February 8,1980 h) Serial 9770; dated October 10, 1980
- 5) Serial 12010; dated May 29, 1981 This letter, as were the referenced letters, is an intenim 50 55(e) report concerning a potentially unsafe situation with respect to the tripping.of reactor coolant pumps during certain primary system high void fraction conditions.
The Midland hardware design, t provide an automatic safety-grade trip signal to all four reactor ecolant pumps when the reactor coolant pressure reaches a lov pressure setpoint (to be determined), has been finalized.
l Installation of the hardware required to implement this modification is scheduled for completion by the end of September,1982.
As d.iscussed in the previous letters (See Reference h), to require a RCP trip during any transient is not an optimal solution to the stated concern.
Consumers Power Company is continuing its participation in the BW Owner's Group p/ogram on Automatic RCP Trip. Two of the goals of this program are to:
(1) develop improved models for predicting post-small break LOCA O) conditions; and (2) develop criteria, based en plant conditions, for 5
determining if automatic RCP trip is required or if sufficient time exists
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for operator manual actions. The projected completion date of the Owner's
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' Group program is June, 1982.
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Serial 1L628 79-03 #6 2
Another report, either interim or final, will be submitted on or before July 9, 1952.
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CC: Director of office of Inspection & Enforcement Att Mr Victor Stello, US?;RC (15)
Director, Office of Management Information & Program Centrol, US?;RC (1)
RJCock,IEC Resident Inspector Midland I'uclear Plant (1)
CEechhoefer, ASLB Panel RSDecker, ASLE Panel FPCcvan, ASLE Panel JRarbour, ASLB Panel AS&L Appeal Panel
!O' Cherry, Esq MSinclair EStamiris CRStephens, US?!RC
- TPat on, Esq, US'GC a
FJKelley, Esq, Asstorney General ShTreeman, Esq, Ass +. Attorney General
'si?:arshall GJMerritt, T!!':&J