ML20031A102
| ML20031A102 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 09/03/1981 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Delgeorge L COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8109180582 | |
| Download: ML20031A102 (4) | |
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LB#1 Rdg TERA DEisenhut PDR SEP 3 1981 JYoungblood LPDR MRushbrook(2)
NSIC KKiper TIC JSnell ACRS (16)
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SHanauer Docket Nos.: *STN 50-454,'STN 50-45 j.,
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and STN 50-456 STN 50;457
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RMattson RHartfield, i-,/
Mr. Louis 0. DelGeorge OELD
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Commonwealth Edison Company
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P. O. Box 767 2
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Dear Mr. De1 George:
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Subject:
RSB FSAR Review of.Byro,n/C,raidwood,,,,.,,,,,,
en' In order to complete our review of the Byron /Braidwood FSAR by the Reactor Systems Branch, we need your responses to all outstanding Q212 questions.and additional clarifications of, your respon.es.to previous questions. Enclosure 1 contains a list of questions to which no respon_se, has been received.' E'nclosure 2 contains questions Q212.153 to Q212.159'which require clarification, of. pre-vious responses. You should be prepared to address these concerns,at a. meeting.
with the staff and laboratory consultants the week,of, September, 21,19.81..
In order to maintain our present schedule of, review,,you.are requested to respond to all outstanding questions and.the.new questions enclosed,withip 30 days of receipt of this 1.ett.er,._, _..
Sincerely, 02 iginal signed by 8, B. J. Youn6 blood)
- 5. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing
Enclosures:
As stwed cc: See ' text page
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,,4 NRC FORM 318 ttCi80) NRCM O2 O OFFICIAL RECORD COPY i US@O 1980-men
' Mr. Louis 0. Del George Dir:ctor of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690 CCs:
Mr " f am Kortier Mr. Edward R. Crass Atomic Power Distribution Nuclear Safeguards and Licensing Division Westinghouse Electric Corporation Sarger.t & Lundy Er:gineers P. O. Box 355 55 East Monroe Street c
Pittsburgh, Pennsylvanic 15230 Chicago, Illinois 60603 Paul M. Murphy, Esq.
Nuclear Regulatory Commission, Region III Isham, Lincoln & Beale Office of Inspection and Enrorcement 9
One First National Plaza 799 Roosevelt Road 42nd Floor Glen Ellyn, Illinois 60137 Chicago, Illinois 60603 Myron Cherry, Esq.
Mrs. Phillip B. Johnson Cherry, Flynn and Kanter 1907 Stratford Lane 1 IBM Plaza, Suite 4501 s
Rockford, Illinois 61107 Chicago, Illinois 60611 Professor Axel Meyer Department of Physics
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Northern Illinois University DeKalb, Illinois 60115 C. Allen Bock, Esq.
P. O. Box 342 Urbanan, Illinois 61801 Thomas J. Gordon, Esq.
l Waaler, Evans & Gordon l
2503 S. Neil Cnampaign, Illinois 61820 Ms. Bridget Little Rorem Appleseed Coordinator l
117 North Linden Street Essex, Illinois 60935 Kenneth F. Levin, Esc.
Beatty, Levin, Holland, Basofin & Sarsany 11 South LaSalle Street Suite 2200 Chicago, Illinois 60603 s
ENCLOSURE 1 The following questions have not been audressed at this time (Amendment 32). Responses will be required to prepare the Safety Evaluation Report.
212.12 212.112 212.15 212.127 212.16 212.135 212.22 212.137 212.23 212.138 212.85 212.144 212.103 R
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ENCLOSURE 2 Additional Information Requested
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Byron /Braidwood 212.0 RSB
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212.153 In regards to Q212.3, provide a discussion.of a DC bus Failure.
In your design, could a DC bus failure cause letdown isolationt (fail closed valves) and simultaneously disable 1a PORV?
212.154 The response to 212.47 references the response.to 212.6. The
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response to 212.6 does not cover all of the concerns of Q212.47.
Provide a response to 212.47 that addresses each item of concern -
as listed in Q212.47.
212.155 Provide more detailed information on the RWST heating system than is given in your response to Q212.50. Specifically adress:
a) Seismic Design b) Single Failure Criteria c) Power Supplies d) Piping and Control System Diagrams 212.156 The response to 212.59 references required ocerator action for long-term core cooling / cold leg injection in 10 minutes following event initiation.
The staff position for manual operator action, as listed in S.R.P. 6.3 is that no credit can be taken for operator action'within 20 minutes. Pro-vide a discussion which lists the consequences of no_ operator action.for 20 minutes following a LOCA.
212.157 The response to 212.83 did not address the following points of concern.
1.
Can the plant be taken to cold shutdown from outside the control room?
2.
What actions are required for this operation?
3.
Provide the locations and address accessibility of the required equipment and instrumentation (also discuss modifications referenced-in Q212.155).
212.158 Provide an upda!cd piping d1agram which shows the pressure relieving check valves referenced in the response to Q212.98.
f 212.159 The response to Q212.139 is not clear.
Provide a discussion which lists the consequences of an overpressure transient in which the control grade pressurizer heater cutout circuit is assumed to fail.
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