ML17191B206

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Discusses Review of Ceco Ltr Dtd 970131,clarifying Commitments Associated with Redundant CR Heating,Ventilation & Air Conditioning Dampers.Forwards RAI Re Redundant CR HVAC Dampers
ML17191B206
Person / Time
Site: Dresden  
Issue date: 01/12/1999
From: Rossbach L
NRC (Affiliation Not Assigned)
To: Kingsley O
COMMONWEALTH EDISON CO.
References
TAC-M97953, TAC-M97954, NUDOCS 9901200444
Download: ML17191B206 (4)
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Text

e January* tz, *** 1:999 Mr. 'Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towers West Ill

  • 1400 Opus Place, Suite 500 Downers Grove, IL 60515

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) - DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 (TAC NOS. M97953 AND M97954)

Dear Mr. Kingsley:

The staff has reviewe~ Commonwealth Edison Company's (ComEd) letter of January 31, 1997, clarifying commitments associated with redundant Control Room (CR)

Heating, Ventilation and Air Conditioning Dampers. These commitments were described in correspondence addressing Dresden, Units 2 and 3, and Quad Cities, Units 1 and 2, NUREG-0737, Item 111.D.3.4, Control Room Habitability Studies. The_ staff requires additional information (enclosed) to complete their review. These questions were discussed with.

members of your staff on December 28, 1998. It was agreed that the responses would be provided within 60 days of the date of this letter. * * -1 *: *

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Docket Nos. 50-237, 50-249.

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UNITED STATES

.NUCLEAR REGULATORY COMMISSION Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 500 Downers Grove, IL 60515 WASHINGTON, D.C. l!05515-<<>01 January 12, 1999

SUBJECT:

. REQUEST FOR ADDITIONAL INFORMATION (RAI) - DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 (TAC NOS. M97953 AND M97954)

Dear Mr. Kingsley:

The staff has reviewed Commonwealth Edison Company's (ComEd) letter of January 31, 1997, clarifying commitments associated with redundant Control Room (CR)

Heating, Ventilation and Air Conditioning Dampers. These commitments were described in correspondence addressing Dresden, Units 2 and 3, and Quad Cities, Units 1 and 2, NUREG-0737, Item 111.D.3.4, Control Room Habitability Studies. The staff requires additional information (enclosed) to complete their review. These questions were discussed with members of your staff on December 28, 1998. It was agreed that the responses would be provided within 60 days of the date of this letter.

Docket Nos. 50-237, 50-249

Enclosure:

RAI cc w/encl: See _next page Sincerely,

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Lawrence W. Rossbach, Project Manager Project Directorate 111-2 Division of Reactor Projects - Ill/IV Office of Nuclear Reactor Regulation

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0. Kingsley Commonwealth Edison Company cc:

Commonwealth Edison Company Site Vice President - Dresden 6500 N. Dresden Road Morris, Illinois 60450-9765 Commonwealth Edison Company Dresden Station Manager 6500 N. Dresden Road Morris, Illinois 60450-9765 U,S. Nuclear Regulatory Commission Dresden Resident Inspectors Office 6500 N. Dresden Road Morris, Illinois 60450-9766 Regional Administrator U.S. NRC, Region Ill 801 Warrenville Road Lisle, Illinois 60532-4351 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1 035 Outer Park Drive Springfield, Illinois 62704 Chairman Grundy County Board Administration Building 1320 Union Street Morris, Illinois 60450 Document Control Desk-Licensing Commonwealth Edison* Company 1400 Opus Place, Suite 400 Downers Grove, Illinois 60515 Commonwealth Edison Company Reg. Assurance Manager - Dresden

  • 6500 N. Dresden Road Morris, Illinois 60450-9765 Mr. David Helwig Senior Vice President Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 900 Downers Grove, Illinois 60515 Dresden Nuclear Pow~r Station Units 2 and 3 Mr. Gene H. Stanley PWR Vice President Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 900 Downers Grove, Illinois 60515 Mr. Christopher Crane BWR Vice President Commonwealth Edison Company Executive Towe rs West Ill 1400 Opus Place, Suite 900 Downers Grove, Illinois 60515 Mr. R. M. Krich Vice President - Regulatory Services Commonwealth Edison Company Executive Towe rs West Ill 1400 Opus Place, Suite 500 Downers Grove, Illinois 60515 Ms. Pamela B. Stroebel Senior Vice President and General Counsel Commonwealth Edison Company P.O. Box 767 Chicago, Illinois 60690-0767

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.QUEST FOR ADDITIONAL INFORM.ON REGARDING CLARIFICATION OF COMMITMENT ASSOCIATED WITH REDUNDANT CONTROL ROOM CCR) HVAC DAMPERS

1. In yol!r submitt~I dated June 28, 1982, yoµ proposed modifications to the existing control room heating, yentilating, arid air conditioning (HVAC) system to meet the intent of NUREG-0737, Item

. 111.D.3.4, Control Room Habitability and NUREG-0800, St~ndard Review Plan (SRP) 6.4, Control Room Habitability System, ~nd to satisfy the requirements of General Design C~iterion (GDC) 19

. regarding control room habitability following a radiological design basis accident (OBA). SRP 6.4

. proviqes guidelines to determine w~ether the system conforms to single failure criteria. Discuss how the emergency safety-related filtration system satisfies the intent of the single failure criteria in SRP 6.4 when only one filtration train and only one air intake damper is used to mitigate the consequ_ences of ~ccident conditions.

2. Discuss the result of a postulated scenario where the non-redundant, emergency safety-related air intake damper in the filtration train is in other than the failed open position. Also discuss how you will maintain the.required flow through the filtration traih without exceeding the filtration

. capacity with ~he emergency s~fety-related air intake damper failed open. Also discuss how you

  • .* will mainte1i.1,1the required_pressurization inside the control room pressure boundary to control the unfiltered irileakag'e$ when the emergency safety-related air intake damper is in other than the

. failed open position.. _Your response should address the identification of the failed damper

  • positions _({ailed open arid failed shut) from the control room and locally, total time credited in the CICCident dos~ analysis to meet GDC 19 requirements from identification of the failed damper to the completion of its repair, and corresponding emergency plant operating procedures and personnel tr~ining.
3. The staff raised some concerns regarding both Quad Cities' and Dresden's implementation of NUREG-0737, "Control Room Habitability," in a teleconference with the licensee on June 17, 1982, and did not_get any Dresden response specific to the issues addressed below. Please provide your response to these concerns for Dresden Station, Units 2 and 3, based on the current system design.
a. State whether the radiation monitor(s) that is located in the control room air intake ducts is capable of initiating automatic isolation of normal control room ventilation.
b. State whether redundant dampers are present in the air intake ducts and whether the exhaust duct has direct access to the outside atmosphere. *
c. Indicate whether procedures and periodic instructions are provided to ensure that control room operators are trained to respond effectively to the presence of toxic chemical vapors in the control room.
4. In your submittal dated June 28, 1982, for Dresden and Quad Cities, you have stated in the portion of the Quad Cities submittal on Page 2, Item (a): "Redundancy of the outside air intake and exhaust dampers - The Figure 1 schematic representation of the Quad Cities Control Room HVAC has been revised. Revision 2 dated June 14, 1982, now contains mor~ detail as to existing
  • plant dampers. As can be seen, by taking_ credit for existing dampers, redundancy of dampers will exist concerning the intake and exhaust of outside air." It seems that Figure 1, Revision 2 for Quad Cities is identical to Figure 1, Revision 2 for Dresden "NEW HVAC EQUIPMENT ROOM" concerning the outside air intake dampers. Without having a safety-related redundant parallel damper on an emergency air intake or crossover connection with a safety-related damper between the safety-related normal air intake path (leading to AHU-8 train) and the emergency air intake (leading to safety-related filtration train), no real redundancy exists for the credited emergency filtration train in the dose analysis to meet GDC 19. Therefore, explain how, by taking credit for existing dampers, redundancy of dampers will exist concerning the intake outside air for the safety-related filtration train for Dresden, Units 2 and 3.

Enclosure

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