ML20031C436
| ML20031C436 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 05/02/1974 |
| From: | Goller K US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| Shared Package | |
| ML20031C437 | List: |
| References | |
| NUDOCS 8110070143 | |
| Download: ML20031C436 (3) | |
Text
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LICENSE AUTHORITY FILE CO
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UNITED STATES L. (
).3 ATOMIC ENERGY COMMISSION 7
WASHINGTON, D.C. 20545 4
6e DO NOMEgopl-Docket no. 55155 May 2,1574 Lif f Consumars Power Company
- g.,e ATTN: Mr. Ralph B. Sewell-
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. Fgg' Nuclear Licensing Administrator 212 Tlest Michigan Avenue Jackson, Michigan 49201 Gentlemen:
On April 29, 1974, the licensee, Consumers Power Company, requested a -
tenporar'/ change in technical specifications for Facility License DPR-6.
The licensee requested that the requirement that the ventilation inlet valve close within 6 seconds be changed to require closure within 10 seconds.
During the refueling outage recently completed, the licensee replaced the 24" containment building ventilation supply valve with a new valve.
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The old valve was replaced due to increasing leakage across the valve seat.
Both the old valve and the new valve are air operated, pressurized to open and to hold open.
The valves are closed by spring action.
The new' valve has a different air operator ' volume. _.The_a.ir operator is vented through two solenoid valves in series which have 1/4" internal vent passages.
The new valve with the larger air operator volume has been tested at the facility and while closure is acsomplished within 10 seconds closure within 6 seconds cannot be achieved without undesirable changes in the valve.
The licensee proposes to replace the existing solenoid valves during the summer refueling outage with solenoid valves having slightly larger internal vent passages to perm't the new ventilation inlet valve to achieve the 6 second closure time.
However, delivery of such valves which comply with necessary code requirements cannot be made for several months.
Reinstallation of the original ventilation valve is an alternative to making this Technical Specification Change, however this is not desirable due to the leakage across that valve.
l The largf_ ventilation valve openings must be provided with rapid closures to prevent the release from containment of radioactiJe materials in the event of an accident.
For the Design Basis Loss of alant Accident j
conditions, which entail a lors of primary coolant to containment followed by release of core fission products to containment and subsequent leakage from containment to the atmosphere, the period before fission products from the core (e.g., on the order to 50-100 seconds) are available for leakage in containment is quite long compared to valve closure times.
The change of valve closure time from 6 seconds to 10 seconds does not affect the integrity of containment wit? respect to containment of core fission piaducts in the event of the loss of coolant accident.
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h.nuters Power Com;)any Iby 2, i974 During the early seconds following an assumed accident, the containment atmasphere consists of a mixture of air and steam flashed from the primary coolant along with a small amount of fission gases, radioactive fission and corrosion products which were carried by the primary coolant which has flashed into steam.
For small and intermediate sized breaks, the change from 6 seconds to 10 seconds in closure time has an insignificant affect on any release of radioactivity from containment.
For large breaks, the pressure may increase toward design limits within 15 or more seconds cnd the total amount of air and later air and steam that could escape if the upstream check valve does not close, could be nearly dcAle for a 10 second closure time, compared to 6 second closure time.
For the first few seconds, containment air of negl* ;ible radioactivity would escape but as containment pressure continued to increase and steam air mixing occurred, the amount of radioactivity escaping would be somewhat greater for a 10 second closure time compared to a 6 second closure time.
However, this increased amount would represent only a small portion of the radioactivity computed to be released in the course of the accident, less than 1% based on the time required to damage fuel.
Accordingly, the increase closure time has a negligible effect on a:cident consequences.
The change does not otherwise affect facility safety.
Based on the above we have concluded that_ temporary change of the ventilation inlet valve closure time from 6 seconds to 10 seconds does not involve a significant hazards consideration and that tnere is reasonable assurance that the health and safety of the public will not be endangered by operation in the manner proposed.
Accordingly, Amendment No. 5 to Facility Operating License flo, DPR-6 is enclosed revising the Technical Spc 'ficatir thereto to authorize the requested temporary change relcting to inle. ventilation valve closure requirement.
A copy of a notice which is being forwarded to the Office of the Federal Regirter for publication relating to this action also is enclosed for your information.
Sincerely, l t.fi Karl R. Goller, Assistant Director for Operating Reactor:,
Directorate of Licensing Enclosure's :
1.
knendment flo. 5 to License flo. DPR-6 2.
Federal Register Motice
Consu::ars Pv.ar Cocpany ildy 2 1974 cc w/encls:
cc w/encls and copy of CPC filing 4/29/74:
f1r. Paul A. Perry, Secretary fir. D. John Beck Consumers Power Company Division of Intergovernmental Relations 212 West liichigan Avenue Executive Office of the Governor Jackson, liichigan 49201 Lewis Cass Building Peter W. Steketee, Esquire Vander Veen, Freihofer & Cook fir. Gary Williams Union Bank Building, Suite 950 Federal Activities Branch Grand Rapids, litchigan 49502 Environmental Protection Agency 1 f;. Wacker Drive fir. Ronald C. Callen Chicago, Illinois 60606 fiichigan Public Service Commission Law Building l
Lansing, litchigan 48913 George C. Freeman, Jr., Esquire Hunton, Williams, Gay & Gibson 700 East l4ain Street Richmond, Virginia 23212 David S. 3rollier, Esquire Hunton, Williams, Gay & Gibson 700 East Main Street Richmond, Virginia 23212 Charles E. Bayless Of Counsel Consumers Power Company 212 West liichigan Avenue Jackson, liichigan 49201 Anthony 2. Roisman, Esquire Berlin, Roisman and Kessler 1712 N Street, fl. W.
Washington, D. C.
20036 Chairman County Board of Supervisors Charlevoix County Charlevoix, liichigan 49720 Charlevoix Public Library 107 Clinton Street Charlevoix, flichigan 49720
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ATOMIC ENERGY COMMISSION WASHINGTON. D.C. 20$45 v
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,ge CONSUMERS POWER COMPANY DOCKET NO. 50-155 BIG ROCK POINT PLANT AMENDMENT TO FACILITY' OPERATING LICENSE Amendment No. 5 License No. DPR-6 1.
The Atomic Energy Commission (the Commission) having found that:
A.
The application for amendment by Consumers Power Company (the licensee) dated April 29, 1974, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended, and the Commission's rules and regulations set forth in 10 CFR Chapter I;
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B.
The issuance of this amendment.will not be inimical to the comon defense and security or to the health and safety of the public, and C.
Prior public notice of this amendment is not required since the amendment does not involve a significant hazards consideration.
2.
Accordingly, the paragraphs under Section 3.B of Facility License No. DPR-6 are hereby amended in their entirety to read as follows:
"3.B Technical Specifications The Technical Specifications contained in Appendix A, attached to Facility Operating License No. DPR-6, are revised as indicated in the attachment to this license amendment. The Technical Specifications, as previously and herein revised, are here'ay incorporated in the license.
The licensee shall operate the facility in accordance with the Technical Specifications, as revised."
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' 3.
This license amendment is effective as of the date of its issuance.
FOR THE ATOMIC ENERGY COMMISSION JIIt
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Karl R. Galler, Assistant Director for Operating Reactors Directorate of Licensing
Attachment:
Change No. 42 to Appendix A Technical Specifications Date of Issuance: May 2, 1974 e
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AT1 ACHMENT TO LICENSE AMENDMENT N0. 5 CHANGE NO. 42 TO TECHNICAL SPECIFICATIONS FACILITY OPERATING LICENSE NO. DPR-6 Add the following at the end of paragraph 3.4.2(f):
"The 6 second inlet valve closure rt cement in the first centence of this paragraph is changed to be 10 seconds beginning with the issuance of this Change No. 42 and continuing for a period not to exceed six months thereafter."
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