ML19345B146
| ML19345B146 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 11/24/1980 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19345B147 | List: |
| References | |
| NUDOCS 8011260213 | |
| Download: ML19345B146 (3) | |
Text
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Commonwealth Edison one run om,onai naza. chicago. minois D h~ dress Reply to Post Ofhce Box 767 d
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Chicago. lilinois 60690 9
November 24, 1980 q,
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4 Mr. Harold R. Denton, Director Of fice of Nuclear Reactor Regulation 3
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U.S. Nuclear Regulatory Commission
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Washington, DC 20555
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a CB Su b,j e c t :
Zion Station Units 1 and 2 Tc]
Additional Fire Protection Information 8
r NRC Docket Nos. 50-295 and 50-304' T
References (a):
March 24, 1980, letter from A.
Schwencer to D. L.
Peoples.
(b):
April 30, 1980, letter from D.
L.
Peoples to H.
R. Denton.
(c):
May 28, 1989, letter from D.
L.
Peoples to H.
R. Denton.
(d):
September 30, 1980, letter from W.
F. Naughton to H. R. Denton.
Dear Mr. Denton:
In Reference (a), the NRC requested Commonwealth Edison Company to provide additional information concerning the Zion Fire Protection Program.
References (b), (c), and (d) provided requested information with the exception of Items U(c) and 8(e).
The response to those two items is contained in Attachment 1 to this letter.
Please address questions regarding this matter to my o f fic e.
One (1) signed original and thirty-nine (39) copies of this letter are provided for your use.
Lundy design drawings referenced in AttachmentSeven copies of the Sargent &
I are also provided.
Very truly yours, 7/8,[h T.
R.
Tramm Nuclear Licensing Administrator Pressurized Water Reactors cc:
Resident Of fice - Zion so#
c 8407A
NRC Docket Nos. 50-295 50-304 Response to request for information dated March 24, 1980, from A.'Schwencer to D.
L.
Peoples Question 8(c)
Demonstrate that changes to safety systems will not degrade safety systems.
(e.g., new isolation switches and control switches shoulo meet design criteria and standards in FSAR for electrical equipment in the system that the switch is to be installed; cabinets that the switches are to be mounted in should also meet the same criteria (FSAR) as other safety related cabinets and panels; to avoid inadvertent isolation from the control roum, the isolation switches should be keylocked, or a larmed in the control.
room if in the " local" or " isolated" position; periodic checks should be made to verify switch is in the proper position for normal operation; and a single transfer switch or other new device should not be a source for a single f ailure to cause loss of redundant safety systems).
Question 8(e)
Demonstrate that alternate shutdown power sources, including : eakers, have isolation devices on control circuits t are routed through the area to be avoided, even if the breaker is to be operated manually.
Response
The following attached drawings indicate the circuit logic required to isolate associated cables, re-establish control functions and provide alternate instrument loops.
These are typical for Unit 1 and Unit 2 will be similar.
1.
Instrument Loops - 22E-1-4943D Rev. E 4943BE 4945K Rev. H 4945L Rev. C 4945T
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Power Cables - 22E-1-4807 Preliminary 4809
" 4830 a
l 22E-1-4840 AP30 AP33 AP34 AV1 AV3 l
AV7 D01 D02 i
RH1 f
RH2 SIl VCl VCl i
VC4 VCS l
All switches and their respectiva enclosures will be qualified.as safety-related and will not degrade existing circuits.
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New instrument cabinets will be key locked and alarm in control room upon door opening.
Also, new equipment for alternate isolated i
instrument loops will not be qualified as safety related because this equipment would only be placed in operation because of a fire i
and not for an accident condition.
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