ML19329E872

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Requests Detailed Evaluation of Potential Refueling Accident in Containment Bldg Be Provided in Fsar.Specific Questions Encl
ML19329E872
Person / Time
Site: Midland
Issue date: 04/06/1977
From: Varga S
Office of Nuclear Reactor Regulation
To: Howell S
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8006180704
Download: ML19329E872 (4)
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INTOP1fATION NEEDED TO F"Att' ATE CpFTATM"ENT TSOLATIO?' CADABIT. TTY DURIt:G REFUE! !NG ACCIDr.::T

1) Describe all instrumentation which would detect a fuel-handling accident (FHA) inside containment. Your response should include the follo-ing information:

a) instrumentation function, e.g.,

close containment isolation valves; b) - type of instruments and setpoints, e.g., nr/hr, and normal backg round reading; c) safety class, redundancy, power sources, and technical specification requirements; d) a description of instrument response following a FHA taking into account instrument location;-

e) response time for the instrument to signal containment isolation after the FHA.

2) Describe the response of the containment isolation and ventilation valves following the FHA.

Include valve closure times including expected valve closure time as well as technical' specification requirements.

3) Provide the transit time from the point where a monitor can respond to a release from the THA to the inboard isolation valve based on the maximun air velocity (peak _ centerline velocity) at maximum exhaust flow. Also include the transit eine based on average velocity and normally expected air ficus. Conservatively assume that the FHA is a-puff release from the pool at a point closest to an i

exhaust grill.

4)

Provide drawinge of the containment which cicarly show the location of the radiation monitors relative to the ventilation exhaust systen including all exhaust inists, filters, dampers,-and dect arrangement up to the outboard

-isolation valves.

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5)

If the su=mation of'the instrument response time (cuestion 1.e) and valve dampers closure time (question 2) is greater than the gas transit time (question 3),

provide an analpsis as to the volume and amount of radioactive exhaust air which_could be released. Your response should include the followinct a) duct sizes; b) maximum (peak) Lair _ velocity; c) average air velocity; d) containment isolation valve closure characteristics; e) exhaust system flow rates; f) methodology used to-calcul' ate gas transit times from the pool surface to the exhaust system; g) air velocity. profiles over the pool surface. You should consider the effects of pool water temperature on air flow trajectories.

6) Describ.e any charcoal filters which would miticate the consequen.cc of the FHA.

If so, include the following information: type (e.g., kidney), redundancy, power. sources, safety grade, technical specification requirements.

In responding to the above, reference can be made to specific pages or figures in the Safety Analysis Report.

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