ML20064M670
| ML20064M670 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 08/26/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0793, RTR-NUREG-793 18434, NUDOCS 8209080071 | |
| Download: ML20064M670 (4) | |
Text
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d Consuiners POVier James W Cook ggg i
uUeeayui85 Vice President - Projects, Engineering G L-and Construction oeneral offices: 1945 West Pernall Road, Jackson, MI 49201 e (L17) 788 0453 August 26, 1982
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liarold R Denton, Director Of fice of Nuclear Reactor Regulation Division of Licensing US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND NUCLEAR C0 GENERATION PLANT MIDLAND DOCKET NOS 50-329, 50-330 REACTOR VESSEL HEAD VENT FILE: 0505.16 SERIAL: 18434 The Safety Evaluation Report for the Midland Plant (NUREG-0793) stipulates that Consumers Power Company is required to install a vent on the reactor vessel head in accordance with 10 CFR 50.44.
Our technical position has been that venting of the reactor vessel head is unnecessary since the other reactor coolant system vents perform the desired function of ensuring venting-of the core cooling circuit. This position predates the cited regulation as docu-mented in the Responses to Post TMI-2 Lessons & Events volume of the FSAR.
With respect to the question of instrumentation to detect the approach to inadequate core cooling, our response has been to provide a subcooling margin monitor, full range hot leg level monitoring, and upgraded core exit thermo-couples.
In response to the Staff's position stated in the SER, sections 4.4.4 and 5.4.7 Consumers Power Company proposes to provide a vent connection between the top of the reactor vessel head, and the top of one of the hot Icgs as conceptually shown in the attached sketch, Figure 1.
The line would provide for venting and purging of the reactor head volume. The vent on the hot leg would allow venting from the system of any non-condensibles. By providing the proposed connection, the hot leg level monitoring system would also provide level monitoring for the reactor vessel to the bottom of the hot leg. CPCo believes that this design, because of its inherent simplicity has sufficient merit to warrant continuation with detailed design and analysis. Our projected schedule would ensure installation by the first scheduled refueling outage, however we will endeavor to complete design and installation prior to fuel load, if practicable.
It is our interpretation of current regulations that a reactor vessel head vent is not specifically required if other system venting is provided.
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However, since the staff believes such a vent is specifically required, we request an exemption from the regulation until the first refueling outage.
A response indicating your concurrence with the proposed course of action to resolve these open issues would be appreciated.
JWC/JRW/fms CC RJCook, Midland Resident Inspector RHernan, US NRC DBMiller, Midland Construction (3)
RWHuston, Washington oc0782-1156a131
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CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329, 50-330 Letter Serial 18434 Dated August 26, 1982 At the request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy Reorganization Act of 1974, as amended and the Commission's Rules and Regulations thereunder, Consumers Power Company submits response to SER Outstanding Item (9), Section 5.4.7 and License Condition (2),
Section 4.4.4.
CONSUMERS POWER COMPANY By J
Cook, Vice President Proj ts, Engineering and Construction Sworn and subscribed before me this & day of ff,2, h4_ _ hb _ _ )
Notary Public 4
Jackson County, Michigan My Commission Expires September 8, 1984.
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