ML17331A477
| ML17331A477 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 09/22/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Dolan J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| References | |
| NUDOCS 8010090518 | |
| Download: ML17331A477 (4) | |
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Q O-September 22, 1980 Docket No. 50-315 and 50-316 f'.r. John Dolan, Vice President Indiana and Yiichigan Electric Company Post Office Box 18 Bowling Green Station ilew York, New York 10004
Dear Hr. Dolan:
Prior to the TNI-2 accident the Commission's regulations regarding hydrogen control '(10 CFR Section 50.44; GDC 50 in Appendix A to 10 CFR Part
- 50) dealt with calculated amounts of hydrogen generated from certain design basis accidents, such as the LOCA.
These relatively small calculated amounts of hydrogen have been accommodated in the D.
C-Cook Units 1
and 2 ice condenser containments by the use of small capacity hydrogen recombiners.
The accident at Three Mile Island Unit 2 (THI-2) involved a large amount cf metal-water reaction in the core with resulting hydrogen generation well n excess of the amounts speci,ied in 10 CFR 50.44 of the Commission's regulations.
Metal-water reactions in the range of 30 to 50 percent have been stimated.
The hydrogen generated in the reaction was released to'the containment, the combustible limit was exceeded and the hydrogen burned.
Studies conducted by the staff indicate tha for ice cordenser containments metal-water reactions in the range of what occurred at TIKI-.2 would result in hydrogen concentrations in the containments well above the combustible level for hydrooen in air.
In addition, the studies indic'aied that the metal water reaction in excess of about.
15% could result in containment pressures ex-ceedingg the design pressure.
This subject has been di scussed previously in the TNI Action Plan (NUREG-0660) with the ACRS and in recent Commission papers and briefings (SECY 80-107 and its supplements).
In lioht of this information the Commission recently placed the following hydrogen control measures in the full power license for the Sequoyah Nuclear Pl ant.
(a)
By January 31,
- 1981, Tennessee Valley Authority (TVA) shall, by testing and analysis, show to the satisfaction of the iNRC staff that an interim hydrogen control system will provide, with reasonable assurance, protect',on
'against breach of containment in the event that a substantial quantity of hydrogen is generated.
a~ozoooo QI3
t Nr. John Dolan Indiana and Nichigan Electric Company September 22, 1980 (b)
For operation of the facility beyond January 31,
- 1982, the Commission must confirm that an adequate hydrogen control system for the plant is installed and will perform its intended function in a manner that provides adequate safety margins-(c)
During the interim period of operation, TVA shall continue a research program on hydr ogen control measures and the effects of hydrogen burns on safety functions and shall submit to the NRC quarterly reports on that research program.
In accordance with section 182(a) of the Atomic Energy Act of 1954, as
- amended, and 10 C.F.R. 50.54(f), you are required to provi de within 20 days of the date of this letter written statements under oath or affirmation setting forth your plans and schedules in regard to the implementation of further hydrogen control measures at D.
C. Cook, Unit Hos.
1 and 2.
As part of your statement you should provi de a preliminary description of any interim hydrogen control system you propose to use and a preliminary discussion of the manner in which the system will provide reasonable assurance that he contai nment will be protected in the event a substantial quantity of hydrogen is generated-Me are considering modifying your license to incorporate the same or similar conditions as were included in the Sequoyah license.
Please indicate in your response whether you agree to such modifications or if there are'ny reasons that this should not b'e done.
- incerely, arrell G.
E s'eniu:, Lirector Division of icensing cc:
See next page eptember 22;..1980 i~r. John Dolan Indiana and Michigan Electric Company CC:
ivIr. Robert W. Jurgensen Chief Nuclear Engineer American Electric Power Service Corporation 2 Broadway New York, New York 10004 Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 1800 N Street, N.W.
Washington, D.
C.
20036 Ci.izens for a Better Environment 59 East 'lan Buren Street Chicago, Illinois 60605 Haude Preston Palenske Hemorial Library 500 11arket Street St. Joseph, Iviichigan 49085 Nr. D. Shaller, Plant Hanager Donald C.
Cook Nuclear Plant P. 0.
Box 458
- Bridoman, Michigan 49106 U.
S. Nuclear Regula ory Cormission Resident Inspec.ors Office 7700 Red Arrow Highway Stevensvi lie, Hichigan 49127 i~r.
Wade Schuler, Supervisor Lake Township
- Baroda, michigan 49101 Nr.
Wi lliam R.
Rustem (2)
Of ice of the Governor Room 1 -"Capitol Building
- Lansing, Michigan 48913 Honorable James
- Bemenek, t~ayor City of Bridoman,,'1ichigan 49106 Director, Techni ca 1 Assessment 0 ivi s ion Office of Radiation Programs (AW-459)
U. S. Environmental Protection Agency Crystal i'Ia 1 1
.":2 Arlington, Yirginia 20460 U. S. Environmental Protection Agency Federal Activities Branch Region 'l Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Maurice S. Reizen, t~.D.
Director Department of Public Health P. 0.
Box 30035
- Lansing, michigan 48909 William J.
- Scanlon, Esquire 2034 Pauline Boulevard Ann Arbor, hali chi gan 48103
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