ML19338C961
| ML19338C961 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 05/09/1973 |
| From: | Ziemann D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Butterfield L COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8009100990 | |
| Download: ML19338C961 (4) | |
Text
.
L IGY 9 1973
^>ocket Ibs
, 50-237, end 50-249 Commonwealth Edison Company ATIN:
Mr. L. D. butterfield, Jr.
Nuclear Licensing Administrator Post Office Box 767 Chicago, Illinois 60690 Gentle ca; In our evaluation of your response dated October 13, 1972, to our letter dated August 3,1972, regarding flooding of critical equip =ent, it has become apparent that additional information is required before we can continue our review. The additional information should provide assurance that the plants do or will meet the guidelines set forth in the enclosed Attachacnt A.
Some information addressing the guidelines has been included in your October 13, 1972 letter and may be incorporated by reference where appropriate.
If your analysis identifies systems or components that require additional changes in your plant to meet the guidelines, submit the results cf your safety analysis regarding the changes, a description of the required changes (including appropriate drawings and sketches), and schedule for completion of the changes. Where temporary protective ceasures are to be taken to protect equipment or systems important to safety, submit your analysis, cescription, and justification for these ceasures and your installation and test schedule. Also describe and discuss the status of investigations and modifications reported to be in progress in your October 13, 1972 letter.
Your response for temporary protective measures should be subnitted as soon as practicable but in not more than 30 days. Other infornation requested above should be submitted within 60 dcys.
It is expected
.80091009 9 0
4 Co:::monwealth Edison Company CY 9 'U3 that all required corrections will be performed as c::peditiously as is practicable.
One signed original and thirty-nine additional copies of your submittals are required.
i Sincerely, Original sis:xd LY Dennis L. Ziemann i
Dennis L. Ziemann, Chief Operating Reactors Branch !2 Directorate of Licensing
Enclosure:
Attachment A - Guidelines cc w/ enclosure:
John U. Howe, isquire j
lsham, Lincoln a Beale Counselors at Lmi One First National Plaza Chicago, _llinois 60670 Morris Public Library 604 Liberty Street Morris, Illinois 60451 Distribution d ocket Files AEC PDRs Local PDR RP Reading Branch Reading JRBuchanan, ORNL DJSkotholt, L:OR TJCarter, L:0R ACRS (16)
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ATTACiEID;T A
.C.*.I.ID.I.LI.: S TOR P..ECT.EC._TIO:i IT.0:: FLOODING 07 T.OUIP: 7 T r ~ ; ~.TK:7 TO P.TT'iT.
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rResponses<should provide assurance that the plants do or will tect the l
followingguidelines:
1.
Separation for redundancy - single failures of non-Class I systca components or pipes shall not result in loss of a systen icportant to safety. Redundant safety equipment shall be separated and protected to assure operability in the event a non-Class I systcu or co=ponent fails.
2.
Access doors and alar =s - waterti:-ht barricra for protection fron flooding of equipment important to safety shall have all access doors or hatches fitted with reliabic switches and circuits that previde an alarm in the control roo= when the access is open.
3.
Scaled water passages - passages or piping and ot.hcr penetrations through walls of a room containing equipment important to safety shall be scaled against water leakage froc any postulated failure of non-Class I water systems. The scals shall be desi;ned for the SSE, including scis=ically induced wave action of water inside the affected co=partment during the SSE.
4.
Class I watertight structures - walls, doors, pancic, er other co=partment closures designed to protect equipecnt igortant to safctf from dar. age due to flooding from a non-Class I syste rupture shall be designed for the SSE, including seisuically induced wave action of water inside the affected conpartcent during the SSE.
5.
Water level alarms and trips - rooms containing ncn-Class I syste= components and pipes whose rupture could result in flood
<'n-nge to equipment important to safety shall have icyc1 alarcs and punp trips (uhcre necessary) that alarn in the control roca and li=it flooding to within the design flood volut2.
Jeduadency of switches is required.
Critical pucp (i.e., hig'.i volu.:e flow,
.uch as condenser circulating water punpc) trip circuits should nect IEEE 279 criteria.
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Clac I equipment should be located or protected cut.. tinat rupture of a non-Class I system connected to a tower containing vcter or body of water (river, lake, etc.) vill not result in failure of the equip;ent f rom flooding.
7.
The safety analysis shall consider simultaneous loss of offsite power with the rupture of a non-Class 1 system component or pipe.
The responses should include a listing of the non-Class I systems considered in the analysis. These should include at least the following systems:
Firewater Decineralized Water Service water vrains Condensate lienting boiler condensate Feedwater Condenser circulating water Reactor Building Cooling Water 11akeup Turbine Building Cooling Water Potable water CFFE>
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