ML17055D891

Forwards Request for Info to Support NRC Mark I Containment Enhancement Program.Response Requested by 880606

ML17055D891
Person / Time
Site:	Nine Mile Point
Issue date:	05/25/1988
From:	Benedict R Office of Nuclear Reactor Regulation
To:	Mangan C NIAGARA MOHAWK POWER CORP.
References
NUDOCS 8806020123
Download: ML17055D891 (10)

Text

ofay 25, 198S Docket No. 50-220 Mr. Charles V. Mangan Senior Vice President Niagara Mohawk Power Corporation 301 Plainfield Road

Syracuse, New York 13212 DISTRIBUTION

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SVarga BBoger CVogan RBenedict JJohnson WButler MThadani OGC-WF EJordan JPartlow ACRS(10)

SUBJECT:

RE(VEST FOR INFORMATION TO SUPPORT THE NRC MARK I CONTAINMENT ENHANCEMENT PROGRAM

REFERENCE:

NINE MILE POINT UNIT 1 The NRC staff is planning to present to the Commission proposals for Mark I" containment improvements.

To assist us in presenting realistic, plant specific features in support of our recommendations, we request that you provide the information delineated in the enclosure, as it pertains to the Nine Mile Point Unit 1 facility.

This enclosure was previously. transmitted to you on May 20, 1988 via telecopy.

To meet our schedule for preparation of these proposals, we ask that your response be received by June 6, 1988.

Should you have any questions 'regarding this request, please call me.

This letter is covered by Office Of Management and Budget; Clearance Number 3150-0011.

Sincerely,

\\

A'~Sibyl signqh l-~!

Enclosure:

As stated cc:

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Mr. C. V. Mangan Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station, Unit No.

1 CC:

Mr. Troy B. Conner, Jr., Esquire Conner

& Wetterhahn Suite 1050 1747 Pennsylvania

Avenue, N.

W.

Washington, D. C.

20006 Mr. Frank R. Church, Supervisor Town of Scriba R.

D. b2

Oswego, New York 13126 Mr. James L. Willis General Supt.-Nuclear Generation Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Post Office Box 32

Lycoming, New York 13093 Resident Inspector U. S. Nuclear Regulatory Commission Post Office Box 126

Lycoming, New York 13093 Mr. Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West

Syracuse, New York 13202 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Ms. Donna Ross New York State Energy Office 2 Empire State Plaza 16th Floor

Albany, New York 12223 Mr. Thomas W.

Roman Unit 1 Station Superintendent Nine Mile Point Nuclear Station Post Office Box 32

Lycoming, New York 13093

1 S

I

inc'osure Office of Management and Budget Clearance Number 3150-0011'ATA BASE FOR MARK I CONTAINMENT ENHANCEMENTS EVALUATION A.

ALTERNATE WATER INJECTION CAPABILITY Identify and list all sianificant water sources which can be injected into the reactor vessel and/or containment under severe accident environments.

For each source listed, provide a descrfptfon of the pathway including the following fnfnrmation:

1.

2.

3.

4, 5.

6.

Power source for injection; Rated flow and delivery pressure; Where will the injection water be drawn fromm; Valve operator power source (AC/DC/Air/other)

If manual valve, describe its accessibility in postulated severe accident environments; and List containment connectfons provided for water source hook up B.

ALTERNATE POWER SUPPLIES WHICH COULD BE MOBILIZED IN SEVERE ACCIDENT CONDITIONS Identify and list all alternate power supplfes which could be hooked up to the plant systems and can substitute for failed power fn severe accident situations.

For each identified source, provfde the following information:

l.

2.

3.

Fuel required to generate the alternate power; Estfmate the time it will take to align the alternate power supply with the plant systems; and Estimate the duration of time the alternate power source would be operable in severe accident environment (at the rated power).

C.

EMERGENCY VENTING CAPABILITY Identify and list the vent paths which are suitable for emergency venting under severe accidents to achieve pressure control, hydrogen control and/or otherwise mitigate agafnst the potential for containment failure.

For each vent path provfde the following information:

1.

2 ~

3.

4.

Size of the vent, path (controlling size);

List the equfpment which fs lfkely to fail or otherwise made unavailable ff the vent pipe or duct fafls; Vent path critical pressure, and expected flow rate of vented materials; Power supply needed for vent operation (Afr/Electrical/manual/other);

s reques s covered by Office of Management and Budget, Clearance Number 3150-0011 which expires December 31, 1989.

Comnents on burden and duplication may be dfrected to the Office of Management and Budaet, Room 3208, New Executive Office Building, Washington, DC 20503.

5.

6.

7.

8.

Maximum operable pressure for containment isolation valves in the vent path; Total. length of the vent path; Height of the vent release point for release to the atmosphere:

and Expected Impacts of vent operation (e.g. contamination of control structure, exposures to the operators).

0.

PRIMARY CONTAINMENT SPRAY NOZZLES In the event of a severe

accident, alternate water sources can be routed to the containment spray system to suppress the pressure rise in the containment, and to scrub the fission products released in the case of core damaging accidents.

Provide the following information for the containment sprays:

a.

Drywell Sprays 1.

Number of spray nozzles, 2.

Nozzle diameter, 3.

Spray Design (single nozzles or nozzle clusters),

and 4.

Spray capacity (flow rate);

and b.

Metwell Sprays 1.

Number af spray nozzles, 2.

Nozzle diameter, 3.

Spray Design, and 4.

Spray Capacity.

E.

SECONDARY CONTAINMENT FIRE SUPPRESSION SYSTEM Secondary containment fire spray system can provide a useful function of scrubbing the fission products, should the primary containment fail as a

result of a core damage accident and release of radioactive materials to the secondary containment.

Provide the following information on the fire.

suppression spray capability:

1.

2.

3.

4, Location of the fire supp~ession spray; Flow capacity of the fire protection water supply to the fire spray system; Fire suppression power supply type and distance from the fire equipment; and How can the fire suppression system he hooked up to the ECCS?

F.

SURVIVABILITYOF AUTOMATIC DEPRESSURIZATION SYSTEM (ADS)

FOLLOWING SEVERE

'ACCIDENTS The ADS is an important safety system which must function in a severe accident environment and permit easy depressurization of the vessel, such that low pressure water supplies can be in)ected fn the vessel.

Provide the following information relative to ADS survivability:

F

ADS va1ve manufacturer; AOS power source (Air/Electric/other):

Maximum containment pressure at which AOS will still be operable; Back up operating

sources, such as accumulators/bottles; and gualification of AOS operating cables for the harsh post-severe-accident environments.

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