ML17055B029
| ML17055B029 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 01/06/1986 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Mangan C NIAGARA MOHAWK POWER CORP. |
| References | |
| GL-83-08, GL-83-8, NUDOCS 8601100061 | |
| Download: ML17055B029 (8) | |
Text
Docket No. 50-220 JAN OI ltd Niagara Mohawk Power Corporation Attn:
Mr. C.
V. Mangan Senior Vice President c/o Miss Catherine R. Seibert 300 Erie Boulevard West
- Syracuse, New York 13202
Dear Mr. Mangan:
SUBJECT:
MODIFICATIONS OF VACUUM BREAKERS ON MARK I CONTAINMENTS (GENERIC LETTER 83-08)
Re:
Nine Mile Point Nuclear Station, Unit No.
1 By letter dated July 22, 1983 you responded to Generic Letter 83-08 dated February 2, 1983.
We are continuing the review and find that we need the information requested in the enclosure to this letter to complete our review regarding the vacuum breakers.
Please respond to this request for information on a schedule to be negotiated with your project manager.
This request for information was approved by the Office of Management and Budget under Clearance No. 3150-0011.
Comments on burden and duplication may be directed to the Office of Management and Budget, Reports Management, Room 3208, New Executive Office Building, Washington, D.C. 20503.
Sincerely,
~tW ~~ by John A. Zwolinski, Director BWR Project Directorate bl Division of BWR Licensing
Enclosure:
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t UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 January 6, 1986 Docket No. 50-220 Niagara Mohawk Power Corporation Attn:
Mr. C. V. Mangan Senior Vice President c/o Miss Catherine R. Seibert 300 Erie Boulevard West
- Syracuse, New York 13202
Dear Mr. Mangan:
SUBJECT:
MODIFICATIONS OF VACUUM BREAKERS ON MARK I CONTAINMENTS (GENERIC LETTER 83-08)
Re:
Nine Mile Point Nuclear Station, Unit No.
1 By letter dated July 22, 1983 you responded to Generic Letter 83-08 dated February 2, 1983.
We are continuing the review and find that we need the information requested in the enclosure to this letter to complete our review regarding the vacuum breakers.
Please respond to this request for information on a schedule to be negotiated with your project manager.
This request for information was approved by the Office of Management and Budget under Clearance No. 3150-0011.
Comments on burden and duplication may be directed to the Office of Management and Budget, Reports Management, Room 3208, New Executive Office Building, Washington, D.C. 20503.
Enclosure:
As stated John
. Zwolinski, Director BWR Project Directorate ¹1 Division of BWR Licensing cc w/enclosure:
See next page
Mr. C. V. Mangan Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station, Unit No.
1 CC:
Troy B. Conner, Jr.,
Esquire Conner 5 Wetterhahn Suite 1050 1747 Pennsylvania
- Avenue, N.
W.
Washington, D.
C.
20006 Frank R. Church, Supervisor Town of Scriba R.
D. j/2
- Oswego, New York 13126 Niagara Mohawk Power Corporation ATTN:
Mr. Thomas Perkins Plant Superintendent 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 John W. Keib, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Mr. Jay Dunkleberger Division of Policy Analysis and Planning New York State Energy Office Agency Building 2 Empire State Plaza
- Albany, New York 12223
0
Request for Additional Information Related to the Modification of Vacuum Breakers on Mark I Containment Nine Mile Point Nuclear Station, Unit I The results of the staff review of the submittal by Niagara Mohawk Power Corporation (NMPC) for torus-to-drywell vacuum breaker modification identified several areas where further information is needed before the staff can complete its review.
These areas summarized below wer e delineated in the staff's generic evaluation of the methodology proposed to predict vacuum breaker valves opening and closing impact velocities, letter from D. Vassllo to H. Pfefferlen, dated December 24, 1984 (copy attached).
1.
Is the chugging source rate used in the NMPC evaluation the same as the one developed in CDI Report (884-3)? If not the
- same, provide the chugging source rate with the supporting justification.
2.
Did the NMPC calculation apply the 1.07 load factor to account for the uncertainty in calculating the underpressure (Section IV of the staff's generic evaluation).
3.
Have the NMPC calculations used the drywe11 model which results in the most conservative prediction (Section V of the gene~ic evaluation)?