ML20041B638
| ML20041B638 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 01/27/1982 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Morisi A BOSTON EDISON CO. |
| References | |
| NUDOCS 8202240443 | |
| Download: ML20041B638 (3) | |
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~ Gray File Docket File ORBQRdg L PDR Sflorris TERA KEccleston OELD Docket No. 50-293 g 7 7 jggg AE0D IE-3 Mr. A. Victor Ibrhi, llanager N
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Dear !!r. Ibrisi:
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The staff is continuing its review of your sub ttals concerni modi fi-cations to the Pilgrin 1 Combustible Gas Control isthT(,CGC and has identified the need for additional information. Th&efo. please pro-vide the infon ation requested in the enclosure within 14 des of receipt of this letter.
This request for infomation contained in the enclosure has been pre-viously discussed with your staff and was telecopied to then on January 18,1982.
The reporting and/or recordkeeping requirenents contained in this letter l
affect fwer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, 1
ORIGINAL SIGNED BY Donenic B. Vassallo, Chief Operating Reactors Branch #2 Division of Licensing i
Enclosure:
Request for Additional Information cc w/ enclosure:
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Mr. Richard D. Machon Pilgrim Station Manage'r Boston Edison Company RFD #1, Rocky Hill Road
. Plymouth, Massachusetts 02360 Henry Herrmann, Esquire Missachusetts Wildlife Federation 151 Tremont Street Boston, Massachusetts.02111 Plymouth Public Library North Street
. Plymouth, Massachusetts 02360 Resident Inspector c/o U. S. NRC P. O. Box 867 Plymouth, Massachusetts 02360 Ms. JoAnn Shatwell Office of the Attorney General Environmental Protection Division 1 Ashburton Place 19th Floor Boston, Massachusetts 02108 Ronald C. Haynes Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue-
. King of Prussia, PA 19406
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Enclosura PILGRIM COMBUSTIBLE GAS CONTROL SYSTEM CONTAINMENT
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IS0tATION ' CAPABILITY The' staff is concerned that the capability to isolate the containment at Pilgrim 1 may be compromised given certain single failures within the Combustible Gas Control System (CGCS).
Recent modifications were made to the CGCS which consisted of the addition of sixteen solenoid valves (two normally closed series valves in each of eight CGCS flow paths).
. Each set of series valves in a given line is powered from the same electrical supply.
It has not been adequately demonstrated that postu-lated single failures will not cause two in-series. valves to open.
In order to resolve these cor.cerns #t is necessary to' provide the following information:
1.
Demonstrate the adequacy of the CGCS design from a containment isolation viewpoint given a single failure which could cause.a set of series valves (SV50881A & 82A, or 81B & 82B, or. 83A & 84A, or 83B & 848, or'85A and 86A, or 85B & 868, or 87A & 88A, or 87B and 888) to open. ' The response should include detailed design justifica-tion and a description of all precautions taken to prevent single failures from causirg a set of two series valves from opening.
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